[clang][CodeGen] Break up TargetInfo.cpp [8/8]

[barannikov88]

Summary

This commit breaks up CodeGen/TargetInfo.cpp into a set of *.cpp files,
one file per target. There are no functional changes, mostly just code moving.

Non-code-moving changes are:

• A virtual destructor has been added to DefaultABIInfo to pin the vtable to a cpp file.
• A few methods of ABIInfo and DefaultABIInfo were split into declaration + definition in order to reduce the number of transitive includes.
• Several functions that used to be static have been placed in clang::CodeGen namespace so that they can be accessed from other cpp files.

RFC: https://discourse.llvm.org/t/rfc-splitting-clangs-targetinfo-cpp/69883

[barannikov88]

Kindly ping

[barannikov88]

ping
Does the approach look right?
Would it be better to put everything into cpp files and only expose a factory method e.g. createMyTargetCodeGenInfo?

[aaron.ballman]

I think this is a reasonable refactoring, but I'm hoping the CodeGen code owners can chime in with their thoughts as well given how large the changes are in their area. (I did not verify that the refactoring didn't change functionality, but spot-checking did not find any differences.)

[MaskRay]

This refactoring looks reasonable to me as well. In clang/lib/Driver, we have D30372 that splits some huge files into target-specific files.

[asb]

+1 on this refactoring being a good idea. The RISC-V changes seem fine to me (haven't done a detailed line by line review).

[myhsu]

In D148094#4284316, @barannikov88 wrote:

ping
Does the approach look right?

This definitely improves the readability and potentially the compilation time.

Would it be better to put everything into cpp files and only expose a factory method e.g. createMyTargetCodeGenInfo?

I'm fine with either approach. Also, the 68k part looks good.

[efriedma]

Restructuring seems overall reasonable. (I'm assuming there isn't actually any changed code, just moving code around.)

[barannikov88]

Rebase

[barannikov88]

Thank you all for taking a look!

In D148094#4296346, @aaron.ballman wrote:

I did not verify that the refactoring didn't change functionality, but spot-checking did not find any differences.

In D148094#4302879, @efriedma wrote:

I'm assuming there isn't actually any changed code, just moving code around.

Apart from code moving this patch splits some methods into
declaration + definition so that the header files only need to include "TargetInfo.h".

This could be avoided by taking a different approach, i.e. the header files
contain only a factory function and cpp files contain the implementation
(of both ABIInfo and TargetCodeGenInfo). This is not a very C++-ish way,
but it would make the changes more straingforward.
I can do it if it's preferable.

In D148094#4296351, @MaskRay wrote:

This refactoring looks reasonable to me as well. In clang/lib/Driver, we have D30372 that splits some huge files into target-specific files.

Thanks, I've updated the RFC with this link.

[barannikov88]

• Update references to modified files in non-code files
• Add LLVM_LIBRARY_VISIBILITY to classes in header files

[barannikov88]

• Rebase on top of the stack
• Fix a header comment
• Split some virtual functions to avoid extra includes in header files
• Forward declare a few classes and add necessary includes (IWYU, header files only)

[barannikov88]

Move interface comments to the header file

[barannikov88]

I think it should be ready for review now.

One point to note.
I didn't follow IWYU rule in target *.cpp files -- they include the smallest set
of headers for now. My memory suggests me that IWYU is a requirement,
but I couldn't find a proof in the coding standard. It now says
"include as little as possible" and further elaborates:

You must include all of the header files that you are using — you can include
them either directly or indirectly through another header file.

I also think it is easier to fix compiler errors afterwards than to try to figure out
the necessary or reasonable set of includes. Please let me know if you disagree.

[barannikov88]

• Forward declare CodeGenTypes
• Split a few more virtual functions into declaration+definition to not depend on transitive includes, which are going to be removed

[barannikov88]

• Move misplaced isHomogenousAggregate definition
• Rearrange definitions in ABIInfo.cpp to match the order of declarations
• Drop some includes in TargetInfo.h that iwyu utility classified as completely unused

[MaskRay]

clang/lib/CodeGen/ABIInfo.h

98 ↗

(On Diff #520041)

Remove "isHomogeneousAggregate - "

https://llvm.org/docs/CodingStandards.html#doxygen-use-in-documentation-comments
"Don’t duplicate function or class name at the beginning of the comment."

[barannikov88]

Rebase

[barannikov88]

Remove introduced duplicate functions

[barannikov88]

Rebase on top of the commit that introduced factory functions

[barannikov88]

Squash commits

[barannikov88]

Undo file renaming so that it does not look like the file was replaced

[barannikov88]

Undo unintended formatting changes

[barannikov88]

Undo reformatting in arch-specific files
This should help in resolving merge conflicts downstream

[barannikov88]

ping :)
Any comments / questions / suggestions are welcome

[barannikov88]

ping

[barannikov88]

Rebase & ping

[barannikov88]

Move complexTempStructure to its only user (PPC.cpp)

[barannikov88]

Add a virtual destructor to DefaultABIInfo to pin the vtable to a cpp file

[barannikov88]

Update BUILD.gn

[barannikov88]

Rebase

[barannikov88]

Undo remaining unintended formatting changes

[barannikov88]

Rebase

[barannikov88]

ping

[barannikov88]

ping

[barannikov88]

ping

[barannikov88]

Rebase

[efriedma]

LGTM

[barannikov88]

@efriedma Thank you for all your reviews!

[barannikov88]

Rebase

clang/docs/UsersManual.rst

 
 The support for X86 (both 32-bit and 64-bit) is considered stable on
 Darwin (macOS), Linux, FreeBSD, and Dragonfly BSD: it has been tested
 to correctly compile many large C, C++, Objective-C, and Objective-C++
 codebases.
 
 On ``x86_64-mingw32``, passing i128(by value) is incompatible with the
 Microsoft x64 calling convention. You might need to tweak
-``WinX86_64ABIInfo::classify()`` in lib/CodeGen/TargetInfo.cpp.
+``WinX86_64ABIInfo::classify()`` in lib/CodeGen/Target/X86.cpp.
 
 For the X86 target, clang supports the `-m16` command line
 argument which enables 16-bit code output. This is broadly similar to
 using ``asm(".code16gcc")`` with the GNU toolchain. The generated code
 and the ABI remains 32-bit but the assembler emits instructions
 appropriate for a CPU running in 16-bit mode, with address-size and
 operand-size prefixes to enable 32-bit addressing and operations.
 

clang/lib/CodeGen/ABIInfo.cpp

+//===- ABIInfoImpl.cpp ----------------------------------------------------===//
+//
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
+//
+//===----------------------------------------------------------------------===//
+
+#include "ABIInfo.h"
+#include "ABIInfoImpl.h"
+
+using namespace clang;
+using namespace clang::CodeGen;
+
+ABIArgInfo ABIInfo::getNaturalAlignIndirect(QualType Ty, bool ByVal,
+                                            bool Realign,
+                                            llvm::Type *Padding) const {
+  return ABIArgInfo::getIndirect(getContext().getTypeAlignInChars(Ty), ByVal,
+                                 Realign, Padding);
+}
+
+ABIArgInfo ABIInfo::getNaturalAlignIndirectInReg(QualType Ty,
+                                                 bool Realign) const {
+  return ABIArgInfo::getIndirectInReg(getContext().getTypeAlignInChars(Ty),
+                                      /*ByVal*/ false, Realign);
+}
+
+Address ABIInfo::EmitMSVAArg(CodeGenFunction &CGF, Address VAListAddr,
+                             QualType Ty) const {
+  return Address::invalid();
+}
+
+bool ABIInfo::isPromotableIntegerTypeForABI(QualType Ty) const {
+  if (getContext().isPromotableIntegerType(Ty))
+    return true;
+
+  if (const auto *EIT = Ty->getAs<BitIntType>())
+    if (EIT->getNumBits() < getContext().getTypeSize(getContext().IntTy))
+      return true;
+
+  return false;
+}
+
+ABIInfo::~ABIInfo() = default;
+
+SwiftABIInfo::~SwiftABIInfo() = default;
+
+/// Does the given lowering require more than the given number of
+/// registers when expanded?
+///
+/// This is intended to be the basis of a reasonable basic implementation
+/// of should{Pass,Return}Indirectly.
+///
+/// For most targets, a limit of four total registers is reasonable; this
+/// limits the amount of code required in order to move around the value
+/// in case it wasn't produced immediately prior to the call by the caller
+/// (or wasn't produced in exactly the right registers) or isn't used
+/// immediately within the callee.  But some targets may need to further
+/// limit the register count due to an inability to support that many
+/// return registers.
+bool SwiftABIInfo::occupiesMoreThan(ArrayRef<llvm::Type *> scalarTypes,
+                                    unsigned maxAllRegisters) const {
+  unsigned intCount = 0, fpCount = 0;
+  for (llvm::Type *type : scalarTypes) {
+    if (type->isPointerTy()) {
+      intCount++;
+    } else if (auto intTy = dyn_cast<llvm::IntegerType>(type)) {
+      auto ptrWidth = CGT.getTarget().getPointerWidth(LangAS::Default);
+      intCount += (intTy->getBitWidth() + ptrWidth - 1) / ptrWidth;
+    } else {
+      assert(type->isVectorTy() || type->isFloatingPointTy());
+      fpCount++;
+    }
+  }
+
+  return (intCount + fpCount > maxAllRegisters);
+}
+
+bool SwiftABIInfo::shouldPassIndirectly(ArrayRef<llvm::Type *> ComponentTys,
+                                        bool AsReturnValue) const {
+  return occupiesMoreThan(ComponentTys, /*total=*/4);
+}
+
+bool SwiftABIInfo::isLegalVectorType(CharUnits VectorSize, llvm::Type *EltTy,
+                                     unsigned NumElts) const {
+  // The default implementation of this assumes that the target guarantees
+  // 128-bit SIMD support but nothing more.
+  return (VectorSize.getQuantity() > 8 && VectorSize.getQuantity() <= 16);
+}
+
+CGCXXABI &ABIInfo::getCXXABI() const { return CGT.getCXXABI(); }
+
+ASTContext &ABIInfo::getContext() const { return CGT.getContext(); }
+
+llvm::LLVMContext &ABIInfo::getVMContext() const {
+  return CGT.getLLVMContext();
+}
+
+const llvm::DataLayout &ABIInfo::getDataLayout() const {
+  return CGT.getDataLayout();
+}
+
+const TargetInfo &ABIInfo::getTarget() const { return CGT.getTarget(); }
+
+const CodeGenOptions &ABIInfo::getCodeGenOpts() const {
+  return CGT.getCodeGenOpts();
+}
+
+bool ABIInfo::isAndroid() const { return getTarget().getTriple().isAndroid(); }
+
+bool ABIInfo::isOHOSFamily() const {
+  return getTarget().getTriple().isOHOSFamily();
+}
+
+bool ABIInfo::isHomogeneousAggregateBaseType(QualType Ty) const {
+  return false;
+}
+
+bool ABIInfo::isHomogeneousAggregateSmallEnough(const Type *Base,
+                                                uint64_t Members) const {
+  return false;
+}
+
+bool ABIInfo::isZeroLengthBitfieldPermittedInHomogeneousAggregate() const {
+  // For compatibility with GCC, ignore empty bitfields in C++ mode.
+  return getContext().getLangOpts().CPlusPlus;
+}

clang/lib/CodeGen/ABIInfoImpl.h

+//===- ABIInfoImpl.h --------------------------------------------*- C++ -*-===//
+//
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
+//
+//===----------------------------------------------------------------------===//
+
+#ifndef LLVM_CLANG_LIB_CODEGEN_ABIINFOIMPL_H
+#define LLVM_CLANG_LIB_CODEGEN_ABIINFOIMPL_H
+
+#include "ABIInfo.h"
+#include "CGCXXABI.h"
+
+namespace clang::CodeGen {
+
+/// DefaultABIInfo - The default implementation for ABI specific
+/// details. This implementation provides information which results in
+/// self-consistent and sensible LLVM IR generation, but does not
+/// conform to any particular ABI.
+class DefaultABIInfo : public ABIInfo {
+public:
+  DefaultABIInfo(CodeGen::CodeGenTypes &CGT) : ABIInfo(CGT) {}
+
+  ABIArgInfo classifyReturnType(QualType RetTy) const;
+  ABIArgInfo classifyArgumentType(QualType RetTy) const;
+
+  void computeInfo(CGFunctionInfo &FI) const override;
+
+  Address EmitVAArg(CodeGenFunction &CGF, Address VAListAddr,
+                    QualType Ty) const override;
+};
+
+ABIArgInfo coerceToIntArray(QualType Ty, ASTContext &Context,
+                            llvm::LLVMContext &LLVMContext);
+
+void AssignToArrayRange(CodeGen::CGBuilderTy &Builder, llvm::Value *Array,
+                        llvm::Value *Value, unsigned FirstIndex,
+                        unsigned LastIndex);
+
+bool isAggregateTypeForABI(QualType T);
+
+llvm::Type *getVAListElementType(CodeGenFunction &CGF);
+
+CGCXXABI::RecordArgABI getRecordArgABI(const RecordType *RT, CGCXXABI &CXXABI);
+
+CGCXXABI::RecordArgABI getRecordArgABI(QualType T, CGCXXABI &CXXABI);
+
+bool classifyReturnType(const CGCXXABI &CXXABI, CGFunctionInfo &FI,
+                        const ABIInfo &Info);
+
+QualType useFirstFieldIfTransparentUnion(QualType Ty);
+
+llvm::Value *emitRoundPointerUpToAlignment(CodeGenFunction &CGF,
+                                           llvm::Value *Ptr, CharUnits Align);
+
+Address emitVoidPtrVAArg(CodeGenFunction &CGF, Address VAListAddr,
+                         QualType ValueTy, bool IsIndirect,
+                         TypeInfoChars ValueInfo, CharUnits SlotSizeAndAlign,
+                         bool AllowHigherAlign, bool ForceRightAdjust = false);
+
+Address complexTempStructure(CodeGenFunction &CGF, Address VAListAddr,
+                             QualType Ty, CharUnits SlotSize, CharUnits EltSize,
+                             const ComplexType *CTy);
+
+Address emitMergePHI(CodeGenFunction &CGF, Address Addr1,
+                     llvm::BasicBlock *Block1, Address Addr2,
+                     llvm::BasicBlock *Block2, const llvm::Twine &Name = "");
+
+bool isEmptyField(ASTContext &Context, const FieldDecl *FD, bool AllowArrays);
+
+bool isEmptyRecord(ASTContext &Context, QualType T, bool AllowArrays);
+
+const Type *isSingleElementStruct(QualType T, ASTContext &Context);
+
+Address EmitVAArgInstr(CodeGenFunction &CGF, Address VAListAddr, QualType Ty,
+                       const ABIArgInfo &AI);
+
+bool isSIMDVectorType(ASTContext &Context, QualType Ty);
+
+bool isRecordWithSIMDVectorType(ASTContext &Context, QualType Ty);
+
+std::string qualifyWindowsLibrary(llvm::StringRef Lib);
+
+void addStackProbeTargetAttributes(const Decl *D, llvm::GlobalValue *GV,
+                                   CodeGen::CodeGenModule &CGM);
+
+} // namespace clang::CodeGen
+
+#endif // LLVM_CLANG_LIB_CODEGEN_ABIINFOIMPL_H

clang/lib/CodeGen/ABIInfoImpl.cpp

+//===- ABIInfoImpl.cpp ----------------------------------------------------===//
+//
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
+//
+//===----------------------------------------------------------------------===//
+
+#include "ABIInfoImpl.h"
+
+using namespace clang;
+using namespace clang::CodeGen;
+
+ABIArgInfo DefaultABIInfo::classifyArgumentType(QualType Ty) const {
+  Ty = useFirstFieldIfTransparentUnion(Ty);
+
+  if (isAggregateTypeForABI(Ty)) {
+    // Records with non-trivial destructors/copy-constructors should not be
+    // passed by value.
+    if (CGCXXABI::RecordArgABI RAA = getRecordArgABI(Ty, getCXXABI()))
+      return getNaturalAlignIndirect(Ty, RAA == CGCXXABI::RAA_DirectInMemory);
+
+    return getNaturalAlignIndirect(Ty);
+  }
+
+  // Treat an enum type as its underlying type.
+  if (const EnumType *EnumTy = Ty->getAs<EnumType>())
+    Ty = EnumTy->getDecl()->getIntegerType();
+
+  ASTContext &Context = getContext();
+  if (const auto *EIT = Ty->getAs<BitIntType>())
+    if (EIT->getNumBits() >
+        Context.getTypeSize(Context.getTargetInfo().hasInt128Type()
+                                ? Context.Int128Ty
+                                : Context.LongLongTy))
+      return getNaturalAlignIndirect(Ty);
+
+  return (isPromotableIntegerTypeForABI(Ty) ? ABIArgInfo::getExtend(Ty)
+                                            : ABIArgInfo::getDirect());
+}
+
+ABIArgInfo DefaultABIInfo::classifyReturnType(QualType RetTy) const {
+  if (RetTy->isVoidType())
+    return ABIArgInfo::getIgnore();
+
+  if (isAggregateTypeForABI(RetTy))
+    return getNaturalAlignIndirect(RetTy);
+
+  // Treat an enum type as its underlying type.
+  if (const EnumType *EnumTy = RetTy->getAs<EnumType>())
+    RetTy = EnumTy->getDecl()->getIntegerType();
+
+  if (const auto *EIT = RetTy->getAs<BitIntType>())
+    if (EIT->getNumBits() >
+        getContext().getTypeSize(getContext().getTargetInfo().hasInt128Type()
+                                     ? getContext().Int128Ty
+                                     : getContext().LongLongTy))
+      return getNaturalAlignIndirect(RetTy);
+
+  return (isPromotableIntegerTypeForABI(RetTy) ? ABIArgInfo::getExtend(RetTy)
+                                               : ABIArgInfo::getDirect());
+}
+
+void DefaultABIInfo::computeInfo(CGFunctionInfo &FI) const {
+  if (!getCXXABI().classifyReturnType(FI))
+    FI.getReturnInfo() = classifyReturnType(FI.getReturnType());
+  for (auto &I : FI.arguments())
+    I.info = classifyArgumentType(I.type);
+}
+
+Address DefaultABIInfo::EmitVAArg(CodeGenFunction &CGF, Address VAListAddr,
+                                  QualType Ty) const {
+  return EmitVAArgInstr(CGF, VAListAddr, Ty, classifyArgumentType(Ty));
+}
+
+// Helper for coercing an aggregate argument or return value into an integer
+// array of the same size (including padding) and alignment.  This alternate
+// coercion happens only for the RenderScript ABI and can be removed after
+// runtimes that rely on it are no longer supported.
+//
+// RenderScript assumes that the size of the argument / return value in the IR
+// is the same as the size of the corresponding qualified type. This helper
+// coerces the aggregate type into an array of the same size (including
+// padding).  This coercion is used in lieu of expansion of struct members or
+// other canonical coercions that return a coerced-type of larger size.
+//
+// Ty          - The argument / return value type
+// Context     - The associated ASTContext
+// LLVMContext - The associated LLVMContext
+ABIArgInfo CodeGen::coerceToIntArray(QualType Ty, ASTContext &Context,
+                                     llvm::LLVMContext &LLVMContext) {
+  // Alignment and Size are measured in bits.
+  const uint64_t Size = Context.getTypeSize(Ty);
+  const uint64_t Alignment = Context.getTypeAlign(Ty);
+  llvm::Type *IntType = llvm::Type::getIntNTy(LLVMContext, Alignment);
+  const uint64_t NumElements = (Size + Alignment - 1) / Alignment;
+  return ABIArgInfo::getDirect(llvm::ArrayType::get(IntType, NumElements));
+}
+
+void CodeGen::AssignToArrayRange(CodeGen::CGBuilderTy &Builder,
+                                 llvm::Value *Array, llvm::Value *Value,
+                                 unsigned FirstIndex, unsigned LastIndex) {
+  // Alternatively, we could emit this as a loop in the source.
+  for (unsigned I = FirstIndex; I <= LastIndex; ++I) {
+    llvm::Value *Cell =
+        Builder.CreateConstInBoundsGEP1_32(Builder.getInt8Ty(), Array, I);
+    Builder.CreateAlignedStore(Value, Cell, CharUnits::One());
+  }
+}
+
+bool CodeGen::isAggregateTypeForABI(QualType T) {
+  return !CodeGenFunction::hasScalarEvaluationKind(T) ||
+         T->isMemberFunctionPointerType();
+}
+
+llvm::Type *CodeGen::getVAListElementType(CodeGenFunction &CGF) {
+  return CGF.ConvertTypeForMem(
+      CGF.getContext().getBuiltinVaListType()->getPointeeType());
+}
+
+CGCXXABI::RecordArgABI CodeGen::getRecordArgABI(const RecordType *RT,
+                                                CGCXXABI &CXXABI) {
+  const CXXRecordDecl *RD = dyn_cast<CXXRecordDecl>(RT->getDecl());
+  if (!RD) {
+    if (!RT->getDecl()->canPassInRegisters())
+      return CGCXXABI::RAA_Indirect;
+    return CGCXXABI::RAA_Default;
+  }
+  return CXXABI.getRecordArgABI(RD);
+}
+
+CGCXXABI::RecordArgABI CodeGen::getRecordArgABI(QualType T, CGCXXABI &CXXABI) {
+  const RecordType *RT = T->getAs<RecordType>();
+  if (!RT)
+    return CGCXXABI::RAA_Default;
+  return getRecordArgABI(RT, CXXABI);
+}
+
+bool CodeGen::classifyReturnType(const CGCXXABI &CXXABI, CGFunctionInfo &FI,
+                                 const ABIInfo &Info) {
+  QualType Ty = FI.getReturnType();
+
+  if (const auto *RT = Ty->getAs<RecordType>())
+    if (!isa<CXXRecordDecl>(RT->getDecl()) &&
+        !RT->getDecl()->canPassInRegisters()) {
+      FI.getReturnInfo() = Info.getNaturalAlignIndirect(Ty);
+      return true;
+    }
+
+  return CXXABI.classifyReturnType(FI);
+}
+
+/// Pass transparent unions as if they were the type of the first element. Sema
+/// should ensure that all elements of the union have the same "machine type".
+QualType CodeGen::useFirstFieldIfTransparentUnion(QualType Ty) {
+  if (const RecordType *UT = Ty->getAsUnionType()) {
+    const RecordDecl *UD = UT->getDecl();
+    if (UD->hasAttr<TransparentUnionAttr>()) {
+      assert(!UD->field_empty() && "sema created an empty transparent union");
+      return UD->field_begin()->getType();
+    }
+  }
+  return Ty;
+}
+
+// Dynamically round a pointer up to a multiple of the given alignment.
+llvm::Value *CodeGen::emitRoundPointerUpToAlignment(CodeGenFunction &CGF,
+                                                    llvm::Value *Ptr,
+                                                    CharUnits Align) {
+  // OverflowArgArea = (OverflowArgArea + Align - 1) & -Align;
+  llvm::Value *RoundUp = CGF.Builder.CreateConstInBoundsGEP1_32(
+      CGF.Builder.getInt8Ty(), Ptr, Align.getQuantity() - 1);
+  return CGF.Builder.CreateIntrinsic(
+      llvm::Intrinsic::ptrmask, {CGF.AllocaInt8PtrTy, CGF.IntPtrTy},
+      {RoundUp, llvm::ConstantInt::get(CGF.IntPtrTy, -Align.getQuantity())},
+      nullptr, Ptr->getName() + ".aligned");
+}
+
+/// Emit va_arg for a platform using the common void* representation,
+/// where arguments are simply emitted in an array of slots on the stack.
+///
+/// This version implements the core direct-value passing rules.
+///
+/// \param SlotSize - The size and alignment of a stack slot.
+///   Each argument will be allocated to a multiple of this number of
+///   slots, and all the slots will be aligned to this value.
+/// \param AllowHigherAlign - The slot alignment is not a cap;
+///   an argument type with an alignment greater than the slot size
+///   will be emitted on a higher-alignment address, potentially
+///   leaving one or more empty slots behind as padding.  If this
+///   is false, the returned address might be less-aligned than
+///   DirectAlign.
+/// \param ForceRightAdjust - Default is false. On big-endian platform and
+///   if the argument is smaller than a slot, set this flag will force
+///   right-adjust the argument in its slot irrespective of the type.
+static Address emitVoidPtrDirectVAArg(CodeGenFunction &CGF,
+                                      Address VAListAddr,
+                                      llvm::Type *DirectTy,
+                                      CharUnits DirectSize,
+                                      CharUnits DirectAlign,
+                                      CharUnits SlotSize,
+                                      bool AllowHigherAlign,
+                                      bool ForceRightAdjust = false) {
+  // Cast the element type to i8* if necessary.  Some platforms define
+  // va_list as a struct containing an i8* instead of just an i8*.
+  if (VAListAddr.getElementType() != CGF.Int8PtrTy)
+    VAListAddr = CGF.Builder.CreateElementBitCast(VAListAddr, CGF.Int8PtrTy);
+
+  llvm::Value *Ptr = CGF.Builder.CreateLoad(VAListAddr, "argp.cur");
+
+  // If the CC aligns values higher than the slot size, do so if needed.
+  Address Addr = Address::invalid();
+  if (AllowHigherAlign && DirectAlign > SlotSize) {
+    Addr = Address(emitRoundPointerUpToAlignment(CGF, Ptr, DirectAlign),
+                   CGF.Int8Ty, DirectAlign);
+  } else {
+    Addr = Address(Ptr, CGF.Int8Ty, SlotSize);
+  }
+
+  // Advance the pointer past the argument, then store that back.
+  CharUnits FullDirectSize = DirectSize.alignTo(SlotSize);
+  Address NextPtr =
+      CGF.Builder.CreateConstInBoundsByteGEP(Addr, FullDirectSize, "argp.next");
+  CGF.Builder.CreateStore(NextPtr.getPointer(), VAListAddr);
+
+  // If the argument is smaller than a slot, and this is a big-endian
+  // target, the argument will be right-adjusted in its slot.
+  if (DirectSize < SlotSize && CGF.CGM.getDataLayout().isBigEndian() &&
+      (!DirectTy->isStructTy() || ForceRightAdjust)) {
+    Addr = CGF.Builder.CreateConstInBoundsByteGEP(Addr, SlotSize - DirectSize);
+  }
+
+  Addr = CGF.Builder.CreateElementBitCast(Addr, DirectTy);
+  return Addr;
+}
+
+/// Emit va_arg for a platform using the common void* representation,
+/// where arguments are simply emitted in an array of slots on the stack.
+///
+/// \param IsIndirect - Values of this type are passed indirectly.
+/// \param ValueInfo - The size and alignment of this type, generally
+///   computed with getContext().getTypeInfoInChars(ValueTy).
+/// \param SlotSizeAndAlign - The size and alignment of a stack slot.
+///   Each argument will be allocated to a multiple of this number of
+///   slots, and all the slots will be aligned to this value.
+/// \param AllowHigherAlign - The slot alignment is not a cap;
+///   an argument type with an alignment greater than the slot size
+///   will be emitted on a higher-alignment address, potentially
+///   leaving one or more empty slots behind as padding.
+/// \param ForceRightAdjust - Default is false. On big-endian platform and
+///   if the argument is smaller than a slot, set this flag will force
+///   right-adjust the argument in its slot irrespective of the type.
+Address CodeGen::emitVoidPtrVAArg(CodeGenFunction &CGF, Address VAListAddr,
+                                  QualType ValueTy, bool IsIndirect,
+                                  TypeInfoChars ValueInfo,
+                                  CharUnits SlotSizeAndAlign,
+                                  bool AllowHigherAlign,
+                                  bool ForceRightAdjust) {
+  // The size and alignment of the value that was passed directly.
+  CharUnits DirectSize, DirectAlign;
+  if (IsIndirect) {
+    DirectSize = CGF.getPointerSize();
+    DirectAlign = CGF.getPointerAlign();
+  } else {
+    DirectSize = ValueInfo.Width;
+    DirectAlign = ValueInfo.Align;
+  }
+
+  // Cast the address we've calculated to the right type.
+  llvm::Type *DirectTy = CGF.ConvertTypeForMem(ValueTy), *ElementTy = DirectTy;
+  if (IsIndirect)
+    DirectTy = DirectTy->getPointerTo(0);
+
+  Address Addr = emitVoidPtrDirectVAArg(CGF, VAListAddr, DirectTy, DirectSize,
+                                        DirectAlign, SlotSizeAndAlign,
+                                        AllowHigherAlign, ForceRightAdjust);
+
+  if (IsIndirect) {
+    Addr = Address(CGF.Builder.CreateLoad(Addr), ElementTy, ValueInfo.Align);
+  }
+
+  return Addr;
+}
+
+Address CodeGen::complexTempStructure(CodeGenFunction &CGF, Address VAListAddr,
+                                      QualType Ty, CharUnits SlotSize,
+                                      CharUnits EltSize,
+                                      const ComplexType *CTy) {
+  Address Addr =
+      emitVoidPtrDirectVAArg(CGF, VAListAddr, CGF.Int8Ty, SlotSize * 2,
+                             SlotSize, SlotSize, /*AllowHigher*/ true);
+
+  Address RealAddr = Addr;
+  Address ImagAddr = RealAddr;
+  if (CGF.CGM.getDataLayout().isBigEndian()) {
+    RealAddr =
+        CGF.Builder.CreateConstInBoundsByteGEP(RealAddr, SlotSize - EltSize);
+    ImagAddr = CGF.Builder.CreateConstInBoundsByteGEP(ImagAddr,
+                                                      2 * SlotSize - EltSize);
+  } else {
+    ImagAddr = CGF.Builder.CreateConstInBoundsByteGEP(RealAddr, SlotSize);
+  }
+
+  llvm::Type *EltTy = CGF.ConvertTypeForMem(CTy->getElementType());
+  RealAddr = CGF.Builder.CreateElementBitCast(RealAddr, EltTy);
+  ImagAddr = CGF.Builder.CreateElementBitCast(ImagAddr, EltTy);
+  llvm::Value *Real = CGF.Builder.CreateLoad(RealAddr, ".vareal");
+  llvm::Value *Imag = CGF.Builder.CreateLoad(ImagAddr, ".vaimag");
+
+  Address Temp = CGF.CreateMemTemp(Ty, "vacplx");
+  CGF.EmitStoreOfComplex({Real, Imag}, CGF.MakeAddrLValue(Temp, Ty),
+                         /*init*/ true);
+  return Temp;
+}
+
+Address CodeGen::emitMergePHI(CodeGenFunction &CGF, Address Addr1,
+                              llvm::BasicBlock *Block1, Address Addr2,
+                              llvm::BasicBlock *Block2,
+                              const llvm::Twine &Name) {
+  assert(Addr1.getType() == Addr2.getType());
+  llvm::PHINode *PHI = CGF.Builder.CreatePHI(Addr1.getType(), 2, Name);
+  PHI->addIncoming(Addr1.getPointer(), Block1);
+  PHI->addIncoming(Addr2.getPointer(), Block2);
+  CharUnits Align = std::min(Addr1.getAlignment(), Addr2.getAlignment());
+  return Address(PHI, Addr1.getElementType(), Align);
+}
+
+/// isEmptyField - Return true iff a the field is "empty", that is it
+/// is an unnamed bit-field or an (array of) empty record(s).
+bool CodeGen::isEmptyField(ASTContext &Context, const FieldDecl *FD,
+                           bool AllowArrays) {
+  if (FD->isUnnamedBitfield())
+    return true;
+
+  QualType FT = FD->getType();
+
+  // Constant arrays of empty records count as empty, strip them off.
+  // Constant arrays of zero length always count as empty.
+  bool WasArray = false;
+  if (AllowArrays)
+    while (const ConstantArrayType *AT = Context.getAsConstantArrayType(FT)) {
+      if (AT->getSize() == 0)
+        return true;
+      FT = AT->getElementType();
+      // The [[no_unique_address]] special case below does not apply to
+      // arrays of C++ empty records, so we need to remember this fact.
+      WasArray = true;
+    }
+
+  const RecordType *RT = FT->getAs<RecordType>();
+  if (!RT)
+    return false;
+
+  // C++ record fields are never empty, at least in the Itanium ABI.
+  //
+  // FIXME: We should use a predicate for whether this behavior is true in the
+  // current ABI.
+  //
+  // The exception to the above rule are fields marked with the
+  // [[no_unique_address]] attribute (since C++20).  Those do count as empty
+  // according to the Itanium ABI.  The exception applies only to records,
+  // not arrays of records, so we must also check whether we stripped off an
+  // array type above.
+  if (isa<CXXRecordDecl>(RT->getDecl()) &&
+      (WasArray || !FD->hasAttr<NoUniqueAddressAttr>()))
+    return false;
+
+  return isEmptyRecord(Context, FT, AllowArrays);
+}
+
+/// isEmptyRecord - Return true iff a structure contains only empty
+/// fields. Note that a structure with a flexible array member is not
+/// considered empty.
+bool CodeGen::isEmptyRecord(ASTContext &Context, QualType T, bool AllowArrays) {
+  const RecordType *RT = T->getAs<RecordType>();
+  if (!RT)
+    return false;
+  const RecordDecl *RD = RT->getDecl();
+  if (RD->hasFlexibleArrayMember())
+    return false;
+
+  // If this is a C++ record, check the bases first.
+  if (const CXXRecordDecl *CXXRD = dyn_cast<CXXRecordDecl>(RD))
+    for (const auto &I : CXXRD->bases())
+      if (!isEmptyRecord(Context, I.getType(), true))
+        return false;
+
+  for (const auto *I : RD->fields())
+    if (!isEmptyField(Context, I, AllowArrays))
+      return false;
+  return true;
+}
+
+/// isSingleElementStruct - Determine if a structure is a "single
+/// element struct", i.e. it has exactly one non-empty field or
+/// exactly one field which is itself a single element
+/// struct. Structures with flexible array members are never
+/// considered single element structs.
+///
+/// \return The field declaration for the single non-empty field, if
+/// it exists.
+const Type *CodeGen::isSingleElementStruct(QualType T, ASTContext &Context) {
+  const RecordType *RT = T->getAs<RecordType>();
+  if (!RT)
+    return nullptr;
+
+  const RecordDecl *RD = RT->getDecl();
+  if (RD->hasFlexibleArrayMember())
+    return nullptr;
+
+  const Type *Found = nullptr;
+
+  // If this is a C++ record, check the bases first.
+  if (const CXXRecordDecl *CXXRD = dyn_cast<CXXRecordDecl>(RD)) {
+    for (const auto &I : CXXRD->bases()) {
+      // Ignore empty records.
+      if (isEmptyRecord(Context, I.getType(), true))
+        continue;
+
+      // If we already found an element then this isn't a single-element struct.
+      if (Found)
+        return nullptr;
+
+      // If this is non-empty and not a single element struct, the composite
+      // cannot be a single element struct.
+      Found = isSingleElementStruct(I.getType(), Context);
+      if (!Found)
+        return nullptr;
+    }
+  }
+
+  // Check for single element.
+  for (const auto *FD : RD->fields()) {
+    QualType FT = FD->getType();
+
+    // Ignore empty fields.
+    if (isEmptyField(Context, FD, true))
+      continue;
+
+    // If we already found an element then this isn't a single-element
+    // struct.
+    if (Found)
+      return nullptr;
+
+    // Treat single element arrays as the element.
+    while (const ConstantArrayType *AT = Context.getAsConstantArrayType(FT)) {
+      if (AT->getSize().getZExtValue() != 1)
+        break;
+      FT = AT->getElementType();
+    }
+
+    if (!isAggregateTypeForABI(FT)) {
+      Found = FT.getTypePtr();
+    } else {
+      Found = isSingleElementStruct(FT, Context);
+      if (!Found)
+        return nullptr;
+    }
+  }
+
+  // We don't consider a struct a single-element struct if it has
+  // padding beyond the element type.
+  if (Found && Context.getTypeSize(Found) != Context.getTypeSize(T))
+    return nullptr;
+
+  return Found;
+}
+
+Address CodeGen::EmitVAArgInstr(CodeGenFunction &CGF, Address VAListAddr,
+                                QualType Ty, const ABIArgInfo &AI) {
+  // This default implementation defers to the llvm backend's va_arg
+  // instruction. It can handle only passing arguments directly
+  // (typically only handled in the backend for primitive types), or
+  // aggregates passed indirectly by pointer (NOTE: if the "byval"
+  // flag has ABI impact in the callee, this implementation cannot
+  // work.)
+
+  // Only a few cases are covered here at the moment -- those needed
+  // by the default abi.
+  llvm::Value *Val;
+
+  if (AI.isIndirect()) {
+    assert(!AI.getPaddingType() &&
+           "Unexpected PaddingType seen in arginfo in generic VAArg emitter!");
+    assert(
+        !AI.getIndirectRealign() &&
+        "Unexpected IndirectRealign seen in arginfo in generic VAArg emitter!");
+
+    auto TyInfo = CGF.getContext().getTypeInfoInChars(Ty);
+    CharUnits TyAlignForABI = TyInfo.Align;
+
+    llvm::Type *ElementTy = CGF.ConvertTypeForMem(Ty);
+    llvm::Type *BaseTy = llvm::PointerType::getUnqual(ElementTy);
+    llvm::Value *Addr =
+        CGF.Builder.CreateVAArg(VAListAddr.getPointer(), BaseTy);
+    return Address(Addr, ElementTy, TyAlignForABI);
+  } else {
+    assert((AI.isDirect() || AI.isExtend()) &&
+           "Unexpected ArgInfo Kind in generic VAArg emitter!");
+
+    assert(!AI.getInReg() &&
+           "Unexpected InReg seen in arginfo in generic VAArg emitter!");
+    assert(!AI.getPaddingType() &&
+           "Unexpected PaddingType seen in arginfo in generic VAArg emitter!");
+    assert(!AI.getDirectOffset() &&
+           "Unexpected DirectOffset seen in arginfo in generic VAArg emitter!");
+    assert(!AI.getCoerceToType() &&
+           "Unexpected CoerceToType seen in arginfo in generic VAArg emitter!");
+
+    Address Temp = CGF.CreateMemTemp(Ty, "varet");
+    Val = CGF.Builder.CreateVAArg(VAListAddr.getPointer(),
+                                  CGF.ConvertTypeForMem(Ty));
+    CGF.Builder.CreateStore(Val, Temp);
+    return Temp;
+  }
+}
+
+bool CodeGen::isSIMDVectorType(ASTContext &Context, QualType Ty) {
+  return Ty->getAs<VectorType>() && Context.getTypeSize(Ty) == 128;
+}
+
+bool CodeGen::isRecordWithSIMDVectorType(ASTContext &Context, QualType Ty) {
+  const RecordType *RT = Ty->getAs<RecordType>();
+  if (!RT)
+    return false;
+  const RecordDecl *RD = RT->getDecl();
+
+  // If this is a C++ record, check the bases first.
+  if (const CXXRecordDecl *CXXRD = dyn_cast<CXXRecordDecl>(RD))
+    for (const auto &I : CXXRD->bases())
+      if (!isRecordWithSIMDVectorType(Context, I.getType()))
+        return false;
+
+  for (const auto *i : RD->fields()) {
+    QualType FT = i->getType();
+
+    if (isSIMDVectorType(Context, FT))
+      return true;
+
+    if (isRecordWithSIMDVectorType(Context, FT))
+      return true;
+  }
+
+  return false;
+}
+
+std::string CodeGen::qualifyWindowsLibrary(llvm::StringRef Lib) {
+  // If the argument does not end in .lib, automatically add the suffix.
+  // If the argument contains a space, enclose it in quotes.
+  // This matches the behavior of MSVC.
+  bool Quote = Lib.contains(' ');
+  std::string ArgStr = Quote ? "\"" : "";
+  ArgStr += Lib;
+  if (!Lib.endswith_insensitive(".lib") && !Lib.endswith_insensitive(".a"))
+    ArgStr += ".lib";
+  ArgStr += Quote ? "\"" : "";
+  return ArgStr;
+}
+
+void CodeGen::addStackProbeTargetAttributes(const Decl *D,
+                                            llvm::GlobalValue *GV,
+                                            CodeGen::CodeGenModule &CGM) {
+  if (llvm::Function *Fn = dyn_cast_or_null<llvm::Function>(GV)) {
+
+    if (CGM.getCodeGenOpts().StackProbeSize != 4096)
+      Fn->addFnAttr("stack-probe-size",
+                    llvm::utostr(CGM.getCodeGenOpts().StackProbeSize));
+    if (CGM.getCodeGenOpts().NoStackArgProbe)
+      Fn->addFnAttr("no-stack-arg-probe");
+  }
+}

clang/lib/CodeGen/CMakeLists.txt

set(LLVM_LINK_COMPONENTS
   ScalarOpts
   Support
   Target
   TargetParser
   TransformUtils
   )
 
 add_clang_library(clangCodeGen
+  ABIInfo.cpp
+  ABIInfoImpl.cpp
   BackendUtil.cpp
   CGAtomic.cpp
   CGBlocks.cpp
   CGBuiltin.cpp
   CGCUDANV.cpp
   CGCUDARuntime.cpp
   CGCXX.cpp
   CGCXXABI.cpp
add_clang_library(clangCodeGen
   MacroPPCallbacks.cpp
   MicrosoftCXXABI.cpp
   ModuleBuilder.cpp
   ObjectFilePCHContainerOperations.cpp
   PatternInit.cpp
   SanitizerMetadata.cpp
   SwiftCallingConv.cpp
   TargetInfo.cpp
+  Targets/AArch64.cpp
+  Targets/AMDGPU.cpp
+  Targets/ARC.cpp
+  Targets/ARM.cpp
+  Targets/AVR.cpp
+  Targets/BPF.cpp
+  Targets/CSKY.cpp
+  Targets/Hexagon.cpp
+  Targets/Lanai.cpp
+  Targets/LoongArch.cpp
+  Targets/M68k.cpp
+  Targets/MSP430.cpp
+  Targets/Mips.cpp
+  Targets/NVPTX.cpp
+  Targets/PNaCl.cpp
+  Targets/PPC.cpp
+  Targets/RISCV.cpp
+  Targets/SPIR.cpp
+  Targets/Sparc.cpp
+  Targets/SystemZ.cpp
+  Targets/TCE.cpp
+  Targets/VE.cpp
+  Targets/WebAssembly.cpp
+  Targets/X86.cpp
+  Targets/XCore.cpp
   VarBypassDetector.cpp
 
   DEPENDS
   intrinsics_gen
 
   LINK_LIBS
   clangAST
   clangAnalysis
   clangBasic
   clangFrontend
   clangLex
   clangSerialization
   )

clang/lib/CodeGen/TargetInfo.cpp

 //===---- TargetInfo.cpp - Encapsulate target details -----------*- C++ -*-===//
 //
 // Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
 // See https://llvm.org/LICENSE.txt for license information.
 // SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 //
 // These classes wrap the information about a call or function
 // definition used to handle ABI compliancy.
 //
 //===----------------------------------------------------------------------===//
 
 #include "TargetInfo.h"
 #include "ABIInfo.h"
+#include "ABIInfoImpl.h"
 #include "CGBlocks.h"
-#include "CGCXXABI.h"
 #include "CGValue.h"
 #include "CodeGenFunction.h"
+#include "Targets/AArch64.h"
+#include "Targets/AMDGPU.h"
+#include "Targets/ARC.h"
+#include "Targets/ARM.h"
+#include "Targets/AVR.h"
+#include "Targets/BPF.h"
+#include "Targets/CSKY.h"
+#include "Targets/Hexagon.h"
+#include "Targets/Lanai.h"
+#include "Targets/LoongArch.h"
+#include "Targets/M68k.h"
+#include "Targets/MSP430.h"
+#include "Targets/Mips.h"
+#include "Targets/NVPTX.h"
+#include "Targets/PNaCl.h"
+#include "Targets/PPC.h"
+#include "Targets/RISCV.h"
+#include "Targets/SPIR.h"
+#include "Targets/Sparc.h"
+#include "Targets/SystemZ.h"
+#include "Targets/TCE.h"
+#include "Targets/VE.h"
+#include "Targets/WebAssembly.h"
+#include "Targets/X86.h"
+#include "Targets/XCore.h"
 #include "clang/AST/Attr.h"
 #include "clang/AST/RecordLayout.h"
-#include "clang/Basic/Builtins.h"
-#include "clang/Basic/CodeGenOptions.h"
 #include "clang/Basic/DiagnosticFrontend.h"
 #include "clang/CodeGen/CGFunctionInfo.h"
-#include "llvm/ADT/SmallBitVector.h"
 #include "llvm/ADT/StringExtras.h"
 #include "llvm/ADT/StringSwitch.h"
 #include "llvm/ADT/Twine.h"
-#include "llvm/IR/DataLayout.h"
-#include "llvm/IR/IntrinsicsNVPTX.h"
-#include "llvm/IR/IntrinsicsS390.h"
 #include "llvm/IR/Type.h"
 #include "llvm/Support/MathExtras.h"
 #include "llvm/Support/raw_ostream.h"
-#include "llvm/TargetParser/RISCVTargetParser.h"
 #include "llvm/TargetParser/Triple.h"
 #include <algorithm>
 
 using namespace clang;
 using namespace CodeGen;
 
-// Helper for coercing an aggregate argument or return value into an integer
-// array of the same size (including padding) and alignment.  This alternate
-// coercion happens only for the RenderScript ABI and can be removed after
-// runtimes that rely on it are no longer supported.
-//
-// RenderScript assumes that the size of the argument / return value in the IR
-// is the same as the size of the corresponding qualified type. This helper
-// coerces the aggregate type into an array of the same size (including
-// padding).  This coercion is used in lieu of expansion of struct members or
-// other canonical coercions that return a coerced-type of larger size.
-//
-// Ty          - The argument / return value type
-// Context     - The associated ASTContext
-// LLVMContext - The associated LLVMContext
-static ABIArgInfo coerceToIntArray(QualType Ty,
-                                   ASTContext &Context,
-                                   llvm::LLVMContext &LLVMContext) {
-  // Alignment and Size are measured in bits.
-  const uint64_t Size = Context.getTypeSize(Ty);
-  const uint64_t Alignment = Context.getTypeAlign(Ty);
-  llvm::Type *IntType = llvm::Type::getIntNTy(LLVMContext, Alignment);
-  const uint64_t NumElements = (Size + Alignment - 1) / Alignment;
-  return ABIArgInfo::getDirect(llvm::ArrayType::get(IntType, NumElements));
-}
-
-static void AssignToArrayRange(CodeGen::CGBuilderTy &Builder,
-                               llvm::Value *Array,
-                               llvm::Value *Value,
-                               unsigned FirstIndex,
-                               unsigned LastIndex) {
-  // Alternatively, we could emit this as a loop in the source.
-  for (unsigned I = FirstIndex; I <= LastIndex; ++I) {
-    llvm::Value *Cell =
-        Builder.CreateConstInBoundsGEP1_32(Builder.getInt8Ty(), Array, I);
-    Builder.CreateAlignedStore(Value, Cell, CharUnits::One());
-  }
-}
-
-static bool isAggregateTypeForABI(QualType T) {
-  return !CodeGenFunction::hasScalarEvaluationKind(T) ||
-         T->isMemberFunctionPointerType();
-}
-
-ABIArgInfo ABIInfo::getNaturalAlignIndirect(QualType Ty, bool ByVal,
-                                            bool Realign,
-                                            llvm::Type *Padding) const {
-  return ABIArgInfo::getIndirect(getContext().getTypeAlignInChars(Ty), ByVal,
-                                 Realign, Padding);
-}
-
-ABIArgInfo
-ABIInfo::getNaturalAlignIndirectInReg(QualType Ty, bool Realign) const {
-  return ABIArgInfo::getIndirectInReg(getContext().getTypeAlignInChars(Ty),
-                                      /*ByVal*/ false, Realign);
-}
-
-Address ABIInfo::EmitMSVAArg(CodeGenFunction &CGF, Address VAListAddr,
-                             QualType Ty) const {
-  return Address::invalid();
-}
-
-static llvm::Type *getVAListElementType(CodeGenFunction &CGF) {
-  return CGF.ConvertTypeForMem(
-      CGF.getContext().getBuiltinVaListType()->getPointeeType());
-}
-
-bool ABIInfo::isPromotableIntegerTypeForABI(QualType Ty) const {
-  if (getContext().isPromotableIntegerType(Ty))
-    return true;
-
-  if (const auto *EIT = Ty->getAs<BitIntType>())
-    if (EIT->getNumBits() < getContext().getTypeSize(getContext().IntTy))
-      return true;
-
-  return false;
-}
-
-ABIInfo::~ABIInfo() = default;
-
-SwiftABIInfo::~SwiftABIInfo() = default;
-
-/// Does the given lowering require more than the given number of
-/// registers when expanded?
-///
-/// This is intended to be the basis of a reasonable basic implementation
-/// of should{Pass,Return}Indirectly.
-///
-/// For most targets, a limit of four total registers is reasonable; this
-/// limits the amount of code required in order to move around the value
-/// in case it wasn't produced immediately prior to the call by the caller
-/// (or wasn't produced in exactly the right registers) or isn't used
-/// immediately within the callee.  But some targets may need to further
-/// limit the register count due to an inability to support that many
-/// return registers.
-bool SwiftABIInfo::occupiesMoreThan(ArrayRef<llvm::Type *> scalarTypes,
-                                    unsigned maxAllRegisters) const {
-  unsigned intCount = 0, fpCount = 0;
-  for (llvm::Type *type : scalarTypes) {
-    if (type->isPointerTy()) {
-      intCount++;
-    } else if (auto intTy = dyn_cast<llvm::IntegerType>(type)) {
-      auto ptrWidth = CGT.getTarget().getPointerWidth(LangAS::Default);
-      intCount += (intTy->getBitWidth() + ptrWidth - 1) / ptrWidth;
-    } else {
-      assert(type->isVectorTy() || type->isFloatingPointTy());
-      fpCount++;
-    }
-  }
-
-  return (intCount + fpCount > maxAllRegisters);
-}
-
-bool SwiftABIInfo::shouldPassIndirectly(ArrayRef<llvm::Type *> ComponentTys,
-                                        bool AsReturnValue) const {
-  return occupiesMoreThan(ComponentTys, /*total=*/4);
-}
-
-bool SwiftABIInfo::isLegalVectorType(CharUnits VectorSize, llvm::Type *EltTy,
-                                     unsigned NumElts) const {
-  // The default implementation of this assumes that the target guarantees
-  // 128-bit SIMD support but nothing more.
-  return (VectorSize.getQuantity() > 8 && VectorSize.getQuantity() <= 16);
-}
-
-static CGCXXABI::RecordArgABI getRecordArgABI(const RecordType *RT,
-                                              CGCXXABI &CXXABI) {
-  const CXXRecordDecl *RD = dyn_cast<CXXRecordDecl>(RT->getDecl());
-  if (!RD) {
-    if (!RT->getDecl()->canPassInRegisters())
-      return CGCXXABI::RAA_Indirect;
-    return CGCXXABI::RAA_Default;
-  }
-  return CXXABI.getRecordArgABI(RD);
-}
-
-static CGCXXABI::RecordArgABI getRecordArgABI(QualType T,
-                                              CGCXXABI &CXXABI) {
-  const RecordType *RT = T->getAs<RecordType>();
-  if (!RT)
-    return CGCXXABI::RAA_Default;
-  return getRecordArgABI(RT, CXXABI);
-}
-
-static bool classifyReturnType(const CGCXXABI &CXXABI, CGFunctionInfo &FI,
-                               const ABIInfo &Info) {
-  QualType Ty = FI.getReturnType();
-
-  if (const auto *RT = Ty->getAs<RecordType>())
-    if (!isa<CXXRecordDecl>(RT->getDecl()) &&
-        !RT->getDecl()->canPassInRegisters()) {
-      FI.getReturnInfo() = Info.getNaturalAlignIndirect(Ty);
-      return true;
-    }
-
-  return CXXABI.classifyReturnType(FI);
-}
-
-/// Pass transparent unions as if they were the type of the first element. Sema
-/// should ensure that all elements of the union have the same "machine type".
-static QualType useFirstFieldIfTransparentUnion(QualType Ty) {
-  if (const RecordType *UT = Ty->getAsUnionType()) {
-    const RecordDecl *UD = UT->getDecl();
-    if (UD->hasAttr<TransparentUnionAttr>()) {
-      assert(!UD->field_empty() && "sema created an empty transparent union");
-      return UD->field_begin()->getType();
-    }
-  }
-  return Ty;
-}
-
-CGCXXABI &ABIInfo::getCXXABI() const {
-  return CGT.getCXXABI();
-}
-
-ASTContext &ABIInfo::getContext() const {
-  return CGT.getContext();
-}
-
-llvm::LLVMContext &ABIInfo::getVMContext() const {
-  return CGT.getLLVMContext();
-}
-
-const llvm::DataLayout &ABIInfo::getDataLayout() const {
-  return CGT.getDataLayout();
-}
-
-const TargetInfo &ABIInfo::getTarget() const {
-  return CGT.getTarget();
-}
-
-const CodeGenOptions &ABIInfo::getCodeGenOpts() const {
-  return CGT.getCodeGenOpts();
-}
-
-bool ABIInfo::isAndroid() const { return getTarget().getTriple().isAndroid(); }
-
-bool ABIInfo::isOHOSFamily() const {
-  return getTarget().getTriple().isOHOSFamily();
-}
-
-bool ABIInfo::isHomogeneousAggregateBaseType(QualType Ty) const {
-  return false;
-}
-
-bool ABIInfo::isHomogeneousAggregateSmallEnough(const Type *Base,
-                                                uint64_t Members) const {
-  return false;
-}
-
-bool ABIInfo::isZeroLengthBitfieldPermittedInHomogeneousAggregate() const {
-  // For compatibility with GCC, ignore empty bitfields in C++ mode.
-  return getContext().getLangOpts().CPlusPlus;
-}
-
 LLVM_DUMP_METHOD void ABIArgInfo::dump() const {
   raw_ostream &OS = llvm::errs();
   OS << "(ABIArgInfo Kind=";
   switch (TheKind) {
   case Direct:
     OS << "Direct Type=";
     if (llvm::Type *Ty = getCoerceToType())
       Ty->print(OS);
LLVM_DUMP_METHOD void ABIArgInfo::dump() const {
   case CoerceAndExpand:
     OS << "CoerceAndExpand Type=";
     getCoerceAndExpandType()->print(OS);
     break;
   }
   OS << ")\n";
 }
 
-// Dynamically round a pointer up to a multiple of the given alignment.
-static llvm::Value *emitRoundPointerUpToAlignment(CodeGenFunction &CGF,
-                                                  llvm::Value *Ptr,
-                                                  CharUnits Align) {
-  // OverflowArgArea = (OverflowArgArea + Align - 1) & -Align;
-  llvm::Value *RoundUp = CGF.Builder.CreateConstInBoundsGEP1_32(
-      CGF.Builder.getInt8Ty(), Ptr, Align.getQuantity() - 1);
-  return CGF.Builder.CreateIntrinsic(
-      llvm::Intrinsic::ptrmask, {CGF.AllocaInt8PtrTy, CGF.IntPtrTy},
-      {RoundUp, llvm::ConstantInt::get(CGF.IntPtrTy, -Align.getQuantity())},
-      nullptr, Ptr->getName() + ".aligned");
-}
-
-/// Emit va_arg for a platform using the common void* representation,
-/// where arguments are simply emitted in an array of slots on the stack.
-///
-/// This version implements the core direct-value passing rules.
-///
-/// \param SlotSize - The size and alignment of a stack slot.
-///   Each argument will be allocated to a multiple of this number of
-///   slots, and all the slots will be aligned to this value.
-/// \param AllowHigherAlign - The slot alignment is not a cap;
-///   an argument type with an alignment greater than the slot size
-///   will be emitted on a higher-alignment address, potentially
-///   leaving one or more empty slots behind as padding.  If this
-///   is false, the returned address might be less-aligned than
-///   DirectAlign.
-/// \param ForceRightAdjust - Default is false. On big-endian platform and
-///   if the argument is smaller than a slot, set this flag will force
-///   right-adjust the argument in its slot irrespective of the type.
-static Address emitVoidPtrDirectVAArg(CodeGenFunction &CGF,
-                                      Address VAListAddr,
-                                      llvm::Type *DirectTy,
-                                      CharUnits DirectSize,
-                                      CharUnits DirectAlign,
-                                      CharUnits SlotSize,
-                                      bool AllowHigherAlign,
-                                      bool ForceRightAdjust = false) {
-  // Cast the element type to i8* if necessary.  Some platforms define
-  // va_list as a struct containing an i8* instead of just an i8*.
-  if (VAListAddr.getElementType() != CGF.Int8PtrTy)
-    VAListAddr = CGF.Builder.CreateElementBitCast(VAListAddr, CGF.Int8PtrTy);
-
-  llvm::Value *Ptr = CGF.Builder.CreateLoad(VAListAddr, "argp.cur");
-
-  // If the CC aligns values higher than the slot size, do so if needed.
-  Address Addr = Address::invalid();
-  if (AllowHigherAlign && DirectAlign > SlotSize) {
-    Addr = Address(emitRoundPointerUpToAlignment(CGF, Ptr, DirectAlign),
-                   CGF.Int8Ty, DirectAlign);
-  } else {
-    Addr = Address(Ptr, CGF.Int8Ty, SlotSize);
-  }
-
-  // Advance the pointer past the argument, then store that back.
-  CharUnits FullDirectSize = DirectSize.alignTo(SlotSize);
-  Address NextPtr =
-      CGF.Builder.CreateConstInBoundsByteGEP(Addr, FullDirectSize, "argp.next");
-  CGF.Builder.CreateStore(NextPtr.getPointer(), VAListAddr);
-
-  // If the argument is smaller than a slot, and this is a big-endian
-  // target, the argument will be right-adjusted in its slot.
-  if (DirectSize < SlotSize && CGF.CGM.getDataLayout().isBigEndian() &&
-      (!DirectTy->isStructTy() || ForceRightAdjust)) {
-    Addr = CGF.Builder.CreateConstInBoundsByteGEP(Addr, SlotSize - DirectSize);
-  }
-
-  Addr = CGF.Builder.CreateElementBitCast(Addr, DirectTy);
-  return Addr;
-}
-
-/// Emit va_arg for a platform using the common void* representation,
-/// where arguments are simply emitted in an array of slots on the stack.
-///
-/// \param IsIndirect - Values of this type are passed indirectly.
-/// \param ValueInfo - The size and alignment of this type, generally
-///   computed with getContext().getTypeInfoInChars(ValueTy).
-/// \param SlotSizeAndAlign - The size and alignment of a stack slot.
-///   Each argument will be allocated to a multiple of this number of
-///   slots, and all the slots will be aligned to this value.
-/// \param AllowHigherAlign - The slot alignment is not a cap;
-///   an argument type with an alignment greater than the slot size
-///   will be emitted on a higher-alignment address, potentially
-///   leaving one or more empty slots behind as padding.
-/// \param ForceRightAdjust - Default is false. On big-endian platform and
-///   if the argument is smaller than a slot, set this flag will force
-///   right-adjust the argument in its slot irrespective of the type.
-static Address emitVoidPtrVAArg(CodeGenFunction &CGF, Address VAListAddr,
-                                QualType ValueTy, bool IsIndirect,
-                                TypeInfoChars ValueInfo,
-                                CharUnits SlotSizeAndAlign,
-                                bool AllowHigherAlign,
-                                bool ForceRightAdjust = false) {
-  // The size and alignment of the value that was passed directly.
-  CharUnits DirectSize, DirectAlign;
-  if (IsIndirect) {
-    DirectSize = CGF.getPointerSize();
-    DirectAlign = CGF.getPointerAlign();
-  } else {
-    DirectSize = ValueInfo.Width;
-    DirectAlign = ValueInfo.Align;
-  }
-
-  // Cast the address we've calculated to the right type.
-  llvm::Type *DirectTy = CGF.ConvertTypeForMem(ValueTy), *ElementTy = DirectTy;
-  if (IsIndirect)
-    DirectTy = DirectTy->getPointerTo(0);
-
-  Address Addr = emitVoidPtrDirectVAArg(CGF, VAListAddr, DirectTy, DirectSize,
-                                        DirectAlign, SlotSizeAndAlign,
-                                        AllowHigherAlign, ForceRightAdjust);
-
-  if (IsIndirect) {
-    Addr = Address(CGF.Builder.CreateLoad(Addr), ElementTy, ValueInfo.Align);
-  }
-
-  return Addr;
-}
-
-static Address complexTempStructure(CodeGenFunction &CGF, Address VAListAddr,
-                                    QualType Ty, CharUnits SlotSize,
-                                    CharUnits EltSize, const ComplexType *CTy) {
-  Address Addr =
-      emitVoidPtrDirectVAArg(CGF, VAListAddr, CGF.Int8Ty, SlotSize * 2,
-                             SlotSize, SlotSize, /*AllowHigher*/ true);
-
-  Address RealAddr = Addr;
-  Address ImagAddr = RealAddr;
-  if (CGF.CGM.getDataLayout().isBigEndian()) {
-    RealAddr =
-        CGF.Builder.CreateConstInBoundsByteGEP(RealAddr, SlotSize - EltSize);
-    ImagAddr = CGF.Builder.CreateConstInBoundsByteGEP(ImagAddr,
-                                                      2 * SlotSize - EltSize);
-  } else {
-    ImagAddr = CGF.Builder.CreateConstInBoundsByteGEP(RealAddr, SlotSize);
-  }
-
-  llvm::Type *EltTy = CGF.ConvertTypeForMem(CTy->getElementType());
-  RealAddr = CGF.Builder.CreateElementBitCast(RealAddr, EltTy);
-  ImagAddr = CGF.Builder.CreateElementBitCast(ImagAddr, EltTy);
-  llvm::Value *Real = CGF.Builder.CreateLoad(RealAddr, ".vareal");
-  llvm::Value *Imag = CGF.Builder.CreateLoad(ImagAddr, ".vaimag");
-
-  Address Temp = CGF.CreateMemTemp(Ty, "vacplx");
-  CGF.EmitStoreOfComplex({Real, Imag}, CGF.MakeAddrLValue(Temp, Ty),
-                         /*init*/ true);
-  return Temp;
-}
-
-static Address emitMergePHI(CodeGenFunction &CGF,
-                            Address Addr1, llvm::BasicBlock *Block1,
-                            Address Addr2, llvm::BasicBlock *Block2,
-                            const llvm::Twine &Name = "") {
-  assert(Addr1.getType() == Addr2.getType());
-  llvm::PHINode *PHI = CGF.Builder.CreatePHI(Addr1.getType(), 2, Name);
-  PHI->addIncoming(Addr1.getPointer(), Block1);
-  PHI->addIncoming(Addr2.getPointer(), Block2);
-  CharUnits Align = std::min(Addr1.getAlignment(), Addr2.getAlignment());
-  return Address(PHI, Addr1.getElementType(), Align);
-}
-
 TargetCodeGenInfo::TargetCodeGenInfo(std::unique_ptr<ABIInfo> Info)
     : Info(std::move(Info)) {}
 
 TargetCodeGenInfo::~TargetCodeGenInfo() = default;
 
 // If someone can figure out a general rule for this, that would be great.
 // It's probably just doomed to be platform-dependent, though.
 unsigned TargetCodeGenInfo::getSizeOfUnwindException() const {

 
 llvm::SyncScope::ID
 TargetCodeGenInfo::getLLVMSyncScopeID(const LangOptions &LangOpts,
                                       SyncScope Scope,
                                       llvm::AtomicOrdering Ordering,
                                       llvm::LLVMContext &Ctx) const {
   return Ctx.getOrInsertSyncScopeID(""); /* default sync scope */
 }
-
-static bool isEmptyRecord(ASTContext &Context, QualType T, bool AllowArrays);
-
-/// isEmptyField - Return true iff a the field is "empty", that is it
-/// is an unnamed bit-field or an (array of) empty record(s).
-static bool isEmptyField(ASTContext &Context, const FieldDecl *FD,
-                         bool AllowArrays) {
-  if (FD->isUnnamedBitfield())
-    return true;
-
-  QualType FT = FD->getType();
-
-  // Constant arrays of empty records count as empty, strip them off.
-  // Constant arrays of zero length always count as empty.
-  bool WasArray = false;
-  if (AllowArrays)
-    while (const ConstantArrayType *AT = Context.getAsConstantArrayType(FT)) {
-      if (AT->getSize() == 0)
-        return true;
-      FT = AT->getElementType();
-      // The [[no_unique_address]] special case below does not apply to
-      // arrays of C++ empty records, so we need to remember this fact.
-      WasArray = true;
-    }
-
-  const RecordType *RT = FT->getAs<RecordType>();
-  if (!RT)
-    return false;
-
-  // C++ record fields are never empty, at least in the Itanium ABI.
-  //
-  // FIXME: We should use a predicate for whether this behavior is true in the
-  // current ABI.
-  //
-  // The exception to the above rule are fields marked with the
-  // [[no_unique_address]] attribute (since C++20).  Those do count as empty
-  // according to the Itanium ABI.  The exception applies only to records,
-  // not arrays of records, so we must also check whether we stripped off an
-  // array type above.
-  if (isa<CXXRecordDecl>(RT->getDecl()) &&
-      (WasArray || !FD->hasAttr<NoUniqueAddressAttr>()))
-    return false;
-
-  return isEmptyRecord(Context, FT, AllowArrays);
-}
-
-/// isEmptyRecord - Return true iff a structure contains only empty
-/// fields. Note that a structure with a flexible array member is not
-/// considered empty.
-static bool isEmptyRecord(ASTContext &Context, QualType T, bool AllowArrays) {
-  const RecordType *RT = T->getAs<RecordType>();
-  if (!RT)
-    return false;
-  const RecordDecl *RD = RT->getDecl();
-  if (RD->hasFlexibleArrayMember())
-    return false;
-
-  // If this is a C++ record, check the bases first.
-  if (const CXXRecordDecl *CXXRD = dyn_cast<CXXRecordDecl>(RD))
-    for (const auto &I : CXXRD->bases())
-      if (!isEmptyRecord(Context, I.getType(), true))
-        return false;
-
-  for (const auto *I : RD->fields())
-    if (!isEmptyField(Context, I, AllowArrays))
-      return false;
-  return true;
-}
-
-/// isSingleElementStruct - Determine if a structure is a "single
-/// element struct", i.e. it has exactly one non-empty field or
-/// exactly one field which is itself a single element
-/// struct. Structures with flexible array members are never
-/// considered single element structs.
-///
-/// \return The field declaration for the single non-empty field, if
-/// it exists.
-static const Type *isSingleElementStruct(QualType T, ASTContext &Context) {
-  const RecordType *RT = T->getAs<RecordType>();
-  if (!RT)
-    return nullptr;
-
-  const RecordDecl *RD = RT->getDecl();
-  if (RD->hasFlexibleArrayMember())
-    return nullptr;
-
-  const Type *Found = nullptr;
-
-  // If this is a C++ record, check the bases first.
-  if (const CXXRecordDecl *CXXRD = dyn_cast<CXXRecordDecl>(RD)) {
-    for (const auto &I : CXXRD->bases()) {
-      // Ignore empty records.
-      if (isEmptyRecord(Context, I.getType(), true))
-        continue;
-
-      // If we already found an element then this isn't a single-element struct.
-      if (Found)
-        return nullptr;
-
-      // If this is non-empty and not a single element struct, the composite
-      // cannot be a single element struct.
-      Found = isSingleElementStruct(I.getType(), Context);
-      if (!Found)
-        return nullptr;
-    }
-  }
-
-  // Check for single element.
-  for (const auto *FD : RD->fields()) {
-    QualType FT = FD->getType();
-
-    // Ignore empty fields.
-    if (isEmptyField(Context, FD, true))
-      continue;
-
-    // If we already found an element then this isn't a single-element
-    // struct.
-    if (Found)
-      return nullptr;
-
-    // Treat single element arrays as the element.
-    while (const ConstantArrayType *AT = Context.getAsConstantArrayType(FT)) {
-      if (AT->getSize().getZExtValue() != 1)
-        break;
-      FT = AT->getElementType();
-    }
-
-    if (!isAggregateTypeForABI(FT)) {
-      Found = FT.getTypePtr();
-    } else {
-      Found = isSingleElementStruct(FT, Context);
-      if (!Found)
-        return nullptr;
-    }
-  }
-
-  // We don't consider a struct a single-element struct if it has
-  // padding beyond the element type.
-  if (Found && Context.getTypeSize(Found) != Context.getTypeSize(T))
-    return nullptr;
-
-  return Found;
-}
-
 namespace {
-Address EmitVAArgInstr(CodeGenFunction &CGF, Address VAListAddr, QualType Ty,
-                       const ABIArgInfo &AI) {
-  // This default implementation defers to the llvm backend's va_arg
-  // instruction. It can handle only passing arguments directly
-  // (typically only handled in the backend for primitive types), or
-  // aggregates passed indirectly by pointer (NOTE: if the "byval"
-  // flag has ABI impact in the callee, this implementation cannot
-  // work.)
-
-  // Only a few cases are covered here at the moment -- those needed
-  // by the default abi.
-  llvm::Value *Val;
-
-  if (AI.isIndirect()) {
-    assert(!AI.getPaddingType() &&
-           "Unexpected PaddingType seen in arginfo in generic VAArg emitter!");
-    assert(
-        !AI.getIndirectRealign() &&
-        "Unexpected IndirectRealign seen in arginfo in generic VAArg emitter!");
-
-    auto TyInfo = CGF.getContext().getTypeInfoInChars(Ty);
-    CharUnits TyAlignForABI = TyInfo.Align;
-
-    llvm::Type *ElementTy = CGF.ConvertTypeForMem(Ty);
-    llvm::Type *BaseTy = llvm::PointerType::getUnqual(ElementTy);
-    llvm::Value *Addr =
-        CGF.Builder.CreateVAArg(VAListAddr.getPointer(), BaseTy);
-    return Address(Addr, ElementTy, TyAlignForABI);
-  } else {
-    assert((AI.isDirect() || AI.isExtend()) &&
-           "Unexpected ArgInfo Kind in generic VAArg emitter!");
-
-    assert(!AI.getInReg() &&
-           "Unexpected InReg seen in arginfo in generic VAArg emitter!");
-    assert(!AI.getPaddingType() &&
-           "Unexpected PaddingType seen in arginfo in generic VAArg emitter!");
-    assert(!AI.getDirectOffset() &&
-           "Unexpected DirectOffset seen in arginfo in generic VAArg emitter!");
-    assert(!AI.getCoerceToType() &&
-           "Unexpected CoerceToType seen in arginfo in generic VAArg emitter!");
-
-    Address Temp = CGF.CreateMemTemp(Ty, "varet");
-    Val = CGF.Builder.CreateVAArg(VAListAddr.getPointer(),
-                                  CGF.ConvertTypeForMem(Ty));
-    CGF.Builder.CreateStore(Val, Temp);
-    return Temp;
-  }
-}
-
-/// DefaultABIInfo - The default implementation for ABI specific
-/// details. This implementation provides information which results in
-/// self-consistent and sensible LLVM IR generation, but does not
-/// conform to any particular ABI.
-class DefaultABIInfo : public ABIInfo {
-public:
-  DefaultABIInfo(CodeGen::CodeGenTypes &CGT) : ABIInfo(CGT) {}
-
-  ABIArgInfo classifyReturnType(QualType RetTy) const;
-  ABIArgInfo classifyArgumentType(QualType RetTy) const;
-
-  void computeInfo(CGFunctionInfo &FI) const override {
-    if (!getCXXABI().classifyReturnType(FI))
-      FI.getReturnInfo() = classifyReturnType(FI.getReturnType());
-    for (auto &I : FI.arguments())
-      I.info = classifyArgumentType(I.type);
-  }
-
-  Address EmitVAArg(CodeGenFunction &CGF, Address VAListAddr,
-                    QualType Ty) const override {
-    return EmitVAArgInstr(CGF, VAListAddr, Ty, classifyArgumentType(Ty));
-  }
-};
 
 class DefaultTargetCodeGenInfo : public TargetCodeGenInfo {
 public:
   DefaultTargetCodeGenInfo(CodeGen::CodeGenTypes &CGT)
       : TargetCodeGenInfo(std::make_unique<DefaultABIInfo>(CGT)) {}
 };
 
-ABIArgInfo DefaultABIInfo::classifyArgumentType(QualType Ty) const {
-  Ty = useFirstFieldIfTransparentUnion(Ty);
-
-  if (isAggregateTypeForABI(Ty)) {
-    // Records with non-trivial destructors/copy-constructors should not be
-    // passed by value.
-    if (CGCXXABI::RecordArgABI RAA = getRecordArgABI(Ty, getCXXABI()))
-      return getNaturalAlignIndirect(Ty, RAA == CGCXXABI::RAA_DirectInMemory);
-
-    return getNaturalAlignIndirect(Ty);
-  }
-
-  // Treat an enum type as its underlying type.
-  if (const EnumType *EnumTy = Ty->getAs<EnumType>())
-    Ty = EnumTy->getDecl()->getIntegerType();
-
-  ASTContext &Context = getContext();
-  if (const auto *EIT = Ty->getAs<BitIntType>())
-    if (EIT->getNumBits() >
-        Context.getTypeSize(Context.getTargetInfo().hasInt128Type()
-                                ? Context.Int128Ty
-                                : Context.LongLongTy))
-      return getNaturalAlignIndirect(Ty);
-
-  return (isPromotableIntegerTypeForABI(Ty) ? ABIArgInfo::getExtend(Ty)
-                                            : ABIArgInfo::getDirect());
-}
-
-ABIArgInfo DefaultABIInfo::classifyReturnType(QualType RetTy) const {
-  if (RetTy->isVoidType())
-    return ABIArgInfo::getIgnore();
-
-  if (isAggregateTypeForABI(RetTy))
-    return getNaturalAlignIndirect(RetTy);
-
-  // Treat an enum type as its underlying type.
-  if (const EnumType *EnumTy = RetTy->getAs<EnumType>())
-    RetTy = EnumTy->getDecl()->getIntegerType();
-
-  if (const auto *EIT = RetTy->getAs<BitIntType>())
-    if (EIT->getNumBits() >
-        getContext().getTypeSize(getContext().getTargetInfo().hasInt128Type()
-                                     ? getContext().Int128Ty
-                                     : getContext().LongLongTy))
-      return getNaturalAlignIndirect(RetTy);
-
-  return (isPromotableIntegerTypeForABI(RetTy) ? ABIArgInfo::getExtend(RetTy)
-                                               : ABIArgInfo::getDirect());
-}
-
-//===----------------------------------------------------------------------===//
-// WebAssembly ABI Implementation
-//
-// This is a very simple ABI that relies a lot on DefaultABIInfo.
-//===----------------------------------------------------------------------===//
-
-enum class WebAssemblyABIKind {
-  MVP = 0,
-  ExperimentalMV = 1,
-};
-
-class WebAssemblyABIInfo final : public ABIInfo {
-  DefaultABIInfo defaultInfo;
-  WebAssemblyABIKind Kind;
-
-public:
-  explicit WebAssemblyABIInfo(CodeGen::CodeGenTypes &CGT,
-                              WebAssemblyABIKind Kind)
-      : ABIInfo(CGT), defaultInfo(CGT), Kind(Kind) {}
-
-private:
-  ABIArgInfo classifyReturnType(QualType RetTy) const;
-  ABIArgInfo classifyArgumentType(QualType Ty) const;
-
-  // DefaultABIInfo's classifyReturnType and classifyArgumentType are
-  // non-virtual, but computeInfo and EmitVAArg are virtual, so we
-  // overload them.
-  void computeInfo(CGFunctionInfo &FI) const override {
-    if (!getCXXABI().classifyReturnType(FI))
-      FI.getReturnInfo() = classifyReturnType(FI.getReturnType());
-    for (auto &Arg : FI.arguments())
-      Arg.info = classifyArgumentType(Arg.type);
-  }
-
-  Address EmitVAArg(CodeGenFunction &CGF, Address VAListAddr,
-                    QualType Ty) const override;
-};
-
-class WebAssemblyTargetCodeGenInfo final : public TargetCodeGenInfo {
-public:
-  explicit WebAssemblyTargetCodeGenInfo(CodeGen::CodeGenTypes &CGT,
-                                        WebAssemblyABIKind K)
-      : TargetCodeGenInfo(std::make_unique<WebAssemblyABIInfo>(CGT, K)) {
-    SwiftInfo =
-        std::make_unique<SwiftABIInfo>(CGT, /*SwiftErrorInRegister=*/false);
-  }
-
-  void setTargetAttributes(const Decl *D, llvm::GlobalValue *GV,
-                           CodeGen::CodeGenModule &CGM) const override {
-    TargetCodeGenInfo::setTargetAttributes(D, GV, CGM);
-    if (const auto *FD = dyn_cast_or_null<FunctionDecl>(D)) {
-      if (const auto *Attr = FD->getAttr<WebAssemblyImportModuleAttr>()) {
-        llvm::Function *Fn = cast<llvm::Function>(GV);
-        llvm::AttrBuilder B(GV->getContext());
-        B.addAttribute("wasm-import-module", Attr->getImportModule());
-        Fn->addFnAttrs(B);
-      }
-      if (const auto *Attr = FD->getAttr<WebAssemblyImportNameAttr>()) {
-        llvm::Function *Fn = cast<llvm::Function>(GV);
-        llvm::AttrBuilder B(GV->getContext());
-        B.addAttribute("wasm-import-name", Attr->getImportName());
-        Fn->addFnAttrs(B);
-      }
-      if (const auto *Attr = FD->getAttr<WebAssemblyExportNameAttr>()) {
-        llvm::Function *Fn = cast<llvm::Function>(GV);
-        llvm::AttrBuilder B(GV->getContext());
-        B.addAttribute("wasm-export-name", Attr->getExportName());
-        Fn->addFnAttrs(B);
-      }
-    }
-
-    if (auto *FD = dyn_cast_or_null<FunctionDecl>(D)) {
-      llvm::Function *Fn = cast<llvm::Function>(GV);
-      if (!FD->doesThisDeclarationHaveABody() && !FD->hasPrototype())
-        Fn->addFnAttr("no-prototype");
-    }
-  }
-
-  /// Return the WebAssembly externref reference type.
-  virtual llvm::Type *getWasmExternrefReferenceType() const override {
-    return llvm::Type::getWasm_ExternrefTy(getABIInfo().getVMContext());
-  }
-  /// Return the WebAssembly funcref reference type.
-  virtual llvm::Type *getWasmFuncrefReferenceType() const override {
-    return llvm::Type::getWasm_FuncrefTy(getABIInfo().getVMContext());
-  }
-};
-
-/// Classify argument of given type \p Ty.
-ABIArgInfo WebAssemblyABIInfo::classifyArgumentType(QualType Ty) const {
-  Ty = useFirstFieldIfTransparentUnion(Ty);
-
-  if (isAggregateTypeForABI(Ty)) {
-    // Records with non-trivial destructors/copy-constructors should not be
-    // passed by value.
-    if (auto RAA = getRecordArgABI(Ty, getCXXABI()))
-      return getNaturalAlignIndirect(Ty, RAA == CGCXXABI::RAA_DirectInMemory);
-    // Ignore empty structs/unions.
-    if (isEmptyRecord(getContext(), Ty, true))
-      return ABIArgInfo::getIgnore();
-    // Lower single-element structs to just pass a regular value. TODO: We
-    // could do reasonable-size multiple-element structs too, using getExpand(),
-    // though watch out for things like bitfields.
-    if (const Type *SeltTy = isSingleElementStruct(Ty, getContext()))
-      return ABIArgInfo::getDirect(CGT.ConvertType(QualType(SeltTy, 0)));
-    // For the experimental multivalue ABI, fully expand all other aggregates
-    if (Kind == WebAssemblyABIKind::ExperimentalMV) {
-      const RecordType *RT = Ty->getAs<RecordType>();
-      assert(RT);
-      bool HasBitField = false;
-      for (auto *Field : RT->getDecl()->fields()) {
-        if (Field->isBitField()) {
-          HasBitField = true;
-          break;
-        }
-      }
-      if (!HasBitField)
-        return ABIArgInfo::getExpand();
-    }
-  }
-
-  // Otherwise just do the default thing.
-  return defaultInfo.classifyArgumentType(Ty);
-}
-
-ABIArgInfo WebAssemblyABIInfo::classifyReturnType(QualType RetTy) const {
-  if (isAggregateTypeForABI(RetTy)) {
-    // Records with non-trivial destructors/copy-constructors should not be
-    // returned by value.
-    if (!getRecordArgABI(RetTy, getCXXABI())) {
-      // Ignore empty structs/unions.
-      if (isEmptyRecord(getContext(), RetTy, true))
-        return ABIArgInfo::getIgnore();
-      // Lower single-element structs to just return a regular value. TODO: We
-      // could do reasonable-size multiple-element structs too, using
-      // ABIArgInfo::getDirect().
-      if (const Type *SeltTy = isSingleElementStruct(RetTy, getContext()))
-        return ABIArgInfo::getDirect(CGT.ConvertType(QualType(SeltTy, 0)));
-      // For the experimental multivalue ABI, return all other aggregates
-      if (Kind == WebAssemblyABIKind::ExperimentalMV)
-        return ABIArgInfo::getDirect();
-    }
-  }
-
-  // Otherwise just do the default thing.
-  return defaultInfo.classifyReturnType(RetTy);
-}
-
-Address WebAssemblyABIInfo::EmitVAArg(CodeGenFunction &CGF, Address VAListAddr,
-                                      QualType Ty) const {
-  bool IsIndirect = isAggregateTypeForABI(Ty) &&
-                    !isEmptyRecord(getContext(), Ty, true) &&
-                    !isSingleElementStruct(Ty, getContext());
-  return emitVoidPtrVAArg(CGF, VAListAddr, Ty, IsIndirect,
-                          getContext().getTypeInfoInChars(Ty),
-                          CharUnits::fromQuantity(4),
-                          /*AllowHigherAlign=*/true);
-}
-
-//===----------------------------------------------------------------------===//
-// le32/PNaCl bitcode ABI Implementation
-//
-// This is a simplified version of the x86_32 ABI.  Arguments and return values
-// are always passed on the stack.
-//===----------------------------------------------------------------------===//
-
-class PNaClABIInfo : public ABIInfo {
- public:
-  PNaClABIInfo(CodeGen::CodeGenTypes &CGT) : ABIInfo(CGT) {}
-
-  ABIArgInfo classifyReturnType(QualType RetTy) const;
-  ABIArgInfo classifyArgumentType(QualType RetTy) const;
-
-  void computeInfo(CGFunctionInfo &FI) const override;
-  Address EmitVAArg(CodeGenFunction &CGF,
-                    Address VAListAddr, QualType Ty) const override;
-};
-
-class PNaClTargetCodeGenInfo : public TargetCodeGenInfo {
- public:
-   PNaClTargetCodeGenInfo(CodeGen::CodeGenTypes &CGT)
-       : TargetCodeGenInfo(std::make_unique<PNaClABIInfo>(CGT)) {}
-};
-
-void PNaClABIInfo::computeInfo(CGFunctionInfo &FI) const {
-  if (!getCXXABI().classifyReturnType(FI))
-    FI.getReturnInfo() = classifyReturnType(FI.getReturnType());
-
-  for (auto &I : FI.arguments())
-    I.info = classifyArgumentType(I.type);
-}
-
-Address PNaClABIInfo::EmitVAArg(CodeGenFunction &CGF, Address VAListAddr,
-                                QualType Ty) const {
-  // The PNaCL ABI is a bit odd, in that varargs don't use normal
-  // function classification. Structs get passed directly for varargs
-  // functions, through a rewriting transform in
-  // pnacl-llvm/lib/Transforms/NaCl/ExpandVarArgs.cpp, which allows
-  // this target to actually support a va_arg instructions with an
-  // aggregate type, unlike other targets.
-  return EmitVAArgInstr(CGF, VAListAddr, Ty, ABIArgInfo::getDirect());
-}
-
-/// Classify argument of given type \p Ty.
-ABIArgInfo PNaClABIInfo::classifyArgumentType(QualType Ty) const {
-  if (isAggregateTypeForABI(Ty)) {
-    if (CGCXXABI::RecordArgABI RAA = getRecordArgABI(Ty, getCXXABI()))
-      return getNaturalAlignIndirect(Ty, RAA == CGCXXABI::RAA_DirectInMemory);
-    return getNaturalAlignIndirect(Ty);
-  } else if (const EnumType *EnumTy = Ty->getAs<EnumType>()) {
-    // Treat an enum type as its underlying type.
-    Ty = EnumTy->getDecl()->getIntegerType();
-  } else if (Ty->isFloatingType()) {
-    // Floating-point types don't go inreg.
-    return ABIArgInfo::getDirect();
-  } else if (const auto *EIT = Ty->getAs<BitIntType>()) {
-    // Treat bit-precise integers as integers if <= 64, otherwise pass
-    // indirectly.
-    if (EIT->getNumBits() > 64)
-      return getNaturalAlignIndirect(Ty);
-    return ABIArgInfo::getDirect();
-  }
-
-  return (isPromotableIntegerTypeForABI(Ty) ? ABIArgInfo::getExtend(Ty)
-                                            : ABIArgInfo::getDirect());
-}
-
-ABIArgInfo PNaClABIInfo::classifyReturnType(QualType RetTy) const {
-  if (RetTy->isVoidType())
-    return ABIArgInfo::getIgnore();
-
-  // In the PNaCl ABI we always return records/structures on the stack.
-  if (isAggregateTypeForABI(RetTy))
-    return getNaturalAlignIndirect(RetTy);
-
-  // Treat bit-precise integers as integers if <= 64, otherwise pass indirectly.
-  if (const auto *EIT = RetTy->getAs<BitIntType>()) {
-    if (EIT->getNumBits() > 64)
-      return getNaturalAlignIndirect(RetTy);
-    return ABIArgInfo::getDirect();
-  }
-
-  // Treat an enum type as its underlying type.
-  if (const EnumType *EnumTy = RetTy->getAs<EnumType>())
-    RetTy = EnumTy->getDecl()->getIntegerType();
-
-  return (isPromotableIntegerTypeForABI(RetTy) ? ABIArgInfo::getExtend(RetTy)
-                                               : ABIArgInfo::getDirect());
-}
-
-/// IsX86_MMXType - Return true if this is an MMX type.
-bool IsX86_MMXType(llvm::Type *IRType) {
-  // Return true if the type is an MMX type <2 x i32>, <4 x i16>, or <8 x i8>.
-  return IRType->isVectorTy() && IRType->getPrimitiveSizeInBits() == 64 &&
-    cast<llvm::VectorType>(IRType)->getElementType()->isIntegerTy() &&
-    IRType->getScalarSizeInBits() != 64;
-}
-
-static llvm::Type* X86AdjustInlineAsmType(CodeGen::CodeGenFunction &CGF,
-                                          StringRef Constraint,
-                                          llvm::Type* Ty) {
-  bool IsMMXCons = llvm::StringSwitch<bool>(Constraint)
-                     .Cases("y", "&y", "^Ym", true)
-                     .Default(false);
-  if (IsMMXCons && Ty->isVectorTy()) {
-    if (cast<llvm::VectorType>(Ty)->getPrimitiveSizeInBits().getFixedValue() !=
-        64) {
-      // Invalid MMX constraint
-      return nullptr;
-    }
-
-    return llvm::Type::getX86_MMXTy(CGF.getLLVMContext());
-  }
-
-  // No operation needed
-  return Ty;
-}
-
-/// Returns true if this type can be passed in SSE registers with the
-/// X86_VectorCall calling convention. Shared between x86_32 and x86_64.
-static bool isX86VectorTypeForVectorCall(ASTContext &Context, QualType Ty) {
-  if (const BuiltinType *BT = Ty->getAs<BuiltinType>()) {
-    if (BT->isFloatingPoint() && BT->getKind() != BuiltinType::Half) {
-      if (BT->getKind() == BuiltinType::LongDouble) {
-        if (&Context.getTargetInfo().getLongDoubleFormat() ==
-            &llvm::APFloat::x87DoubleExtended())
-          return false;
-      }
-      return true;
-    }
-  } else if (const VectorType *VT = Ty->getAs<VectorType>()) {
-    // vectorcall can pass XMM, YMM, and ZMM vectors. We don't pass SSE1 MMX
-    // registers specially.
-    unsigned VecSize = Context.getTypeSize(VT);
-    if (VecSize == 128 || VecSize == 256 || VecSize == 512)
-      return true;
-  }
-  return false;
-}
-
-/// Returns true if this aggregate is small enough to be passed in SSE registers
-/// in the X86_VectorCall calling convention. Shared between x86_32 and x86_64.
-static bool isX86VectorCallAggregateSmallEnough(uint64_t NumMembers) {
-  return NumMembers <= 4;
-}
-
-/// Returns a Homogeneous Vector Aggregate ABIArgInfo, used in X86.
-static ABIArgInfo getDirectX86Hva(llvm::Type* T = nullptr) {
-  auto AI = ABIArgInfo::getDirect(T);
-  AI.setInReg(true);
-  AI.setCanBeFlattened(false);
-  return AI;
-}
-
-//===----------------------------------------------------------------------===//
-// X86-32 ABI Implementation
-//===----------------------------------------------------------------------===//
-
-/// Similar to llvm::CCState, but for Clang.
-struct CCState {
-  CCState(CGFunctionInfo &FI)
-      : IsPreassigned(FI.arg_size()), CC(FI.getCallingConvention()) {}
-
-  llvm::SmallBitVector IsPreassigned;
-  unsigned CC = CallingConv::CC_C;
-  unsigned FreeRegs = 0;
-  unsigned FreeSSERegs = 0;
-};
-
-/// X86_32ABIInfo - The X86-32 ABI information.
-class X86_32ABIInfo : public ABIInfo {
-  enum Class {
-    Integer,
-    Float
-  };
-
-  static const unsigned MinABIStackAlignInBytes = 4;
-
-  bool IsDarwinVectorABI;
-  bool IsRetSmallStructInRegABI;
-  bool IsWin32StructABI;
-  bool IsSoftFloatABI;
-  bool IsMCUABI;
-  bool IsLinuxABI;
-  unsigned DefaultNumRegisterParameters;
-
-  static bool isRegisterSize(unsigned Size) {
-    return (Size == 8 || Size == 16 || Size == 32 || Size == 64);
-  }
-
-  bool isHomogeneousAggregateBaseType(QualType Ty) const override {
-    // FIXME: Assumes vectorcall is in use.
-    return isX86VectorTypeForVectorCall(getContext(), Ty);
-  }
-
-  bool isHomogeneousAggregateSmallEnough(const Type *Ty,
-                                         uint64_t NumMembers) const override {
-    // FIXME: Assumes vectorcall is in use.
-    return isX86VectorCallAggregateSmallEnough(NumMembers);
-  }
-
-  bool shouldReturnTypeInRegister(QualType Ty, ASTContext &Context) const;
-
-  /// getIndirectResult - Give a source type \arg Ty, return a suitable result
-  /// such that the argument will be passed in memory.
-  ABIArgInfo getIndirectResult(QualType Ty, bool ByVal, CCState &State) const;
-
-  ABIArgInfo getIndirectReturnResult(QualType Ty, CCState &State) const;
-
-  /// Return the alignment to use for the given type on the stack.
-  unsigned getTypeStackAlignInBytes(QualType Ty, unsigned Align) const;
-
-  Class classify(QualType Ty) const;
-  ABIArgInfo classifyReturnType(QualType RetTy, CCState &State) const;
-  ABIArgInfo classifyArgumentType(QualType RetTy, CCState &State) const;
-
-  /// Updates the number of available free registers, returns
-  /// true if any registers were allocated.
-  bool updateFreeRegs(QualType Ty, CCState &State) const;
-
-  bool shouldAggregateUseDirect(QualType Ty, CCState &State, bool &InReg,
-                                bool &NeedsPadding) const;
-  bool shouldPrimitiveUseInReg(QualType Ty, CCState &State) const;
-
-  bool canExpandIndirectArgument(QualType Ty) const;
-
-  /// Rewrite the function info so that all memory arguments use
-  /// inalloca.
-  void rewriteWithInAlloca(CGFunctionInfo &FI) const;
-
-  void addFieldToArgStruct(SmallVector<llvm::Type *, 6> &FrameFields,
-                           CharUnits &StackOffset, ABIArgInfo &Info,
-                           QualType Type) const;
-  void runVectorCallFirstPass(CGFunctionInfo &FI, CCState &State) const;
-
-public:
-
-  void computeInfo(CGFunctionInfo &FI) const override;
-  Address EmitVAArg(CodeGenFunction &CGF, Address VAListAddr,
-                    QualType Ty) const override;
-
-  X86_32ABIInfo(CodeGen::CodeGenTypes &CGT, bool DarwinVectorABI,
-                bool RetSmallStructInRegABI, bool Win32StructABI,
-                unsigned NumRegisterParameters, bool SoftFloatABI)
-      : ABIInfo(CGT), IsDarwinVectorABI(DarwinVectorABI),
-        IsRetSmallStructInRegABI(RetSmallStructInRegABI),
-        IsWin32StructABI(Win32StructABI), IsSoftFloatABI(SoftFloatABI),
-        IsMCUABI(CGT.getTarget().getTriple().isOSIAMCU()),
-        IsLinuxABI(CGT.getTarget().getTriple().isOSLinux() ||
-                   CGT.getTarget().getTriple().isOSCygMing()),
-        DefaultNumRegisterParameters(NumRegisterParameters) {}
-};
-
-class X86_32SwiftABIInfo : public SwiftABIInfo {
-public:
-  explicit X86_32SwiftABIInfo(CodeGenTypes &CGT)
-      : SwiftABIInfo(CGT, /*SwiftErrorInRegister=*/false) {}
-
-  bool shouldPassIndirectly(ArrayRef<llvm::Type *> ComponentTys,
-                            bool AsReturnValue) const override {
-    // LLVM's x86-32 lowering currently only assigns up to three
-    // integer registers and three fp registers.  Oddly, it'll use up to
-    // four vector registers for vectors, but those can overlap with the
-    // scalar registers.
-    return occupiesMoreThan(ComponentTys, /*total=*/3);
-  }
-};
-
-class X86_32TargetCodeGenInfo : public TargetCodeGenInfo {
-public:
-  X86_32TargetCodeGenInfo(CodeGen::CodeGenTypes &CGT, bool DarwinVectorABI,
-                          bool RetSmallStructInRegABI, bool Win32StructABI,
-                          unsigned NumRegisterParameters, bool SoftFloatABI)
-      : TargetCodeGenInfo(std::make_unique<X86_32ABIInfo>(
-            CGT, DarwinVectorABI, RetSmallStructInRegABI, Win32StructABI,
-            NumRegisterParameters, SoftFloatABI)) {
-    SwiftInfo = std::make_unique<X86_32SwiftABIInfo>(CGT);
-  }
-
-  static bool isStructReturnInRegABI(
-      const llvm::Triple &Triple, const CodeGenOptions &Opts);
-
-  void setTargetAttributes(const Decl *D, llvm::GlobalValue *GV,
-                           CodeGen::CodeGenModule &CGM) const override;
-
-  int getDwarfEHStackPointer(CodeGen::CodeGenModule &CGM) const override {
-    // Darwin uses different dwarf register numbers for EH.
-    if (CGM.getTarget().getTriple().isOSDarwin()) return 5;
-    return 4;
-  }
-
-  bool initDwarfEHRegSizeTable(CodeGen::CodeGenFunction &CGF,
-                               llvm::Value *Address) const override;
-
-  llvm::Type* adjustInlineAsmType(CodeGen::CodeGenFunction &CGF,
-                                  StringRef Constraint,
-                                  llvm::Type* Ty) const override {
-    return X86AdjustInlineAsmType(CGF, Constraint, Ty);
-  }
-
-  void addReturnRegisterOutputs(CodeGenFunction &CGF, LValue ReturnValue,
-                                std::string &Constraints,
-                                std::vector<llvm::Type *> &ResultRegTypes,
-                                std::vector<llvm::Type *> &ResultTruncRegTypes,
-                                std::vector<LValue> &ResultRegDests,
-                                std::string &AsmString,
-                                unsigned NumOutputs) const override;
-
-  llvm::Constant *
-  getUBSanFunctionSignature(CodeGen::CodeGenModule &CGM) const override {
-    unsigned Sig = (0xeb << 0) |  // jmp rel8
-                   (0x06 << 8) |  //           .+0x08
-                   ('v' << 16) |
-                   ('2' << 24);
-    return llvm::ConstantInt::get(CGM.Int32Ty, Sig);
-  }
-
-  StringRef getARCRetainAutoreleasedReturnValueMarker() const override {
-    return "movl\t%ebp, %ebp"
-           "\t\t// marker for objc_retainAutoreleaseReturnValue";
-  }
-};
-
-}
-
-/// Rewrite input constraint references after adding some output constraints.
-/// In the case where there is one output and one input and we add one output,
-/// we need to replace all operand references greater than or equal to 1:
-///     mov $0, $1
-///     mov eax, $1
-/// The result will be:
-///     mov $0, $2
-///     mov eax, $2
-static void rewriteInputConstraintReferences(unsigned FirstIn,
-                                             unsigned NumNewOuts,
-                                             std::string &AsmString) {
-  std::string Buf;
-  llvm::raw_string_ostream OS(Buf);
-  size_t Pos = 0;
-  while (Pos < AsmString.size()) {
-    size_t DollarStart = AsmString.find('$', Pos);
-    if (DollarStart == std::string::npos)
-      DollarStart = AsmString.size();
-    size_t DollarEnd = AsmString.find_first_not_of('$', DollarStart);
-    if (DollarEnd == std::string::npos)
-      DollarEnd = AsmString.size();
-    OS << StringRef(&AsmString[Pos], DollarEnd - Pos);
-    Pos = DollarEnd;
-    size_t NumDollars = DollarEnd - DollarStart;
-    if (NumDollars % 2 != 0 && Pos < AsmString.size()) {
-      // We have an operand reference.
-      size_t DigitStart = Pos;
-      if (AsmString[DigitStart] == '{') {
-        OS << '{';
-        ++DigitStart;
-      }
-      size_t DigitEnd = AsmString.find_first_not_of("0123456789", DigitStart);
-      if (DigitEnd == std::string::npos)
-        DigitEnd = AsmString.size();
-      StringRef OperandStr(&AsmString[DigitStart], DigitEnd - DigitStart);
-      unsigned OperandIndex;
-      if (!OperandStr.getAsInteger(10, OperandIndex)) {
-        if (OperandIndex >= FirstIn)
-          OperandIndex += NumNewOuts;
-        OS << OperandIndex;
-      } else {
-        OS << OperandStr;
-      }
-      Pos = DigitEnd;
-    }
-  }
-  AsmString = std::move(OS.str());
-}
-
-/// Add output constraints for EAX:EDX because they are return registers.
-void X86_32TargetCodeGenInfo::addReturnRegisterOutputs(
-    CodeGenFunction &CGF, LValue ReturnSlot, std::string &Constraints,
-    std::vector<llvm::Type *> &ResultRegTypes,
-    std::vector<llvm::Type *> &ResultTruncRegTypes,
-    std::vector<LValue> &ResultRegDests, std::string &AsmString,
-    unsigned NumOutputs) const {
-  uint64_t RetWidth = CGF.getContext().getTypeSize(ReturnSlot.getType());
-
-  // Use the EAX constraint if the width is 32 or smaller and EAX:EDX if it is
-  // larger.
-  if (!Constraints.empty())
-    Constraints += ',';
-  if (RetWidth <= 32) {
-    Constraints += "={eax}";
-    ResultRegTypes.push_back(CGF.Int32Ty);
-  } else {
-    // Use the 'A' constraint for EAX:EDX.
-    Constraints += "=A";
-    ResultRegTypes.push_back(CGF.Int64Ty);
-  }
-
-  // Truncate EAX or EAX:EDX to an integer of the appropriate size.
-  llvm::Type *CoerceTy = llvm::IntegerType::get(CGF.getLLVMContext(), RetWidth);
-  ResultTruncRegTypes.push_back(CoerceTy);
-
-  // Coerce the integer by bitcasting the return slot pointer.
-  ReturnSlot.setAddress(
-      CGF.Builder.CreateElementBitCast(ReturnSlot.getAddress(CGF), CoerceTy));
-  ResultRegDests.push_back(ReturnSlot);
-
-  rewriteInputConstraintReferences(NumOutputs, 1, AsmString);
-}
-
-/// shouldReturnTypeInRegister - Determine if the given type should be
-/// returned in a register (for the Darwin and MCU ABI).
-bool X86_32ABIInfo::shouldReturnTypeInRegister(QualType Ty,
-                                               ASTContext &Context) const {
-  uint64_t Size = Context.getTypeSize(Ty);
-
-  // For i386, type must be register sized.
-  // For the MCU ABI, it only needs to be <= 8-byte
-  if ((IsMCUABI && Size > 64) || (!IsMCUABI && !isRegisterSize(Size)))
-   return false;
-
-  if (Ty->isVectorType()) {
-    // 64- and 128- bit vectors inside structures are not returned in
-    // registers.
-    if (Size == 64 || Size == 128)
-      return false;
-
-    return true;
-  }
-
-  // If this is a builtin, pointer, enum, complex type, member pointer, or
-  // member function pointer it is ok.
-  if (Ty->getAs<BuiltinType>() || Ty->hasPointerRepresentation() ||
-      Ty->isAnyComplexType() || Ty->isEnumeralType() ||
-      Ty->isBlockPointerType() || Ty->isMemberPointerType())
-    return true;
-
-  // Arrays are treated like records.
-  if (const ConstantArrayType *AT = Context.getAsConstantArrayType(Ty))
-    return shouldReturnTypeInRegister(AT->getElementType(), Context);
-
-  // Otherwise, it must be a record type.
-  const RecordType *RT = Ty->getAs<RecordType>();
-  if (!RT) return false;
-
-  // FIXME: Traverse bases here too.
-
-  // Structure types are passed in register if all fields would be
-  // passed in a register.
-  for (const auto *FD : RT->getDecl()->fields()) {
-    // Empty fields are ignored.
-    if (isEmptyField(Context, FD, true))
-      continue;
-
-    // Check fields recursively.
-    if (!shouldReturnTypeInRegister(FD->getType(), Context))
-      return false;
-  }
-  return true;
-}
-
-static bool is32Or64BitBasicType(QualType Ty, ASTContext &Context) {
-  // Treat complex types as the element type.
-  if (const ComplexType *CTy = Ty->getAs<ComplexType>())
-    Ty = CTy->getElementType();
-
-  // Check for a type which we know has a simple scalar argument-passing
-  // convention without any padding.  (We're specifically looking for 32
-  // and 64-bit integer and integer-equivalents, float, and double.)
-  if (!Ty->getAs<BuiltinType>() && !Ty->hasPointerRepresentation() &&
-      !Ty->isEnumeralType() && !Ty->isBlockPointerType())
-    return false;
-
-  uint64_t Size = Context.getTypeSize(Ty);
-  return Size == 32 || Size == 64;
-}
-
-static bool addFieldSizes(ASTContext &Context, const RecordDecl *RD,
-                          uint64_t &Size) {
-  for (const auto *FD : RD->fields()) {
-    // Scalar arguments on the stack get 4 byte alignment on x86. If the
-    // argument is smaller than 32-bits, expanding the struct will create
-    // alignment padding.
-    if (!is32Or64BitBasicType(FD->getType(), Context))
-      return false;
-
-    // FIXME: Reject bit-fields wholesale; there are two problems, we don't know
-    // how to expand them yet, and the predicate for telling if a bitfield still
-    // counts as "basic" is more complicated than what we were doing previously.
-    if (FD->isBitField())
-      return false;
-
-    Size += Context.getTypeSize(FD->getType());
-  }
-  return true;
-}
-
-static bool addBaseAndFieldSizes(ASTContext &Context, const CXXRecordDecl *RD,
-                                 uint64_t &Size) {
-  // Don't do this if there are any non-empty bases.
-  for (const CXXBaseSpecifier &Base : RD->bases()) {
-    if (!addBaseAndFieldSizes(Context, Base.getType()->getAsCXXRecordDecl(),
-                              Size))
-      return false;
-  }
-  if (!addFieldSizes(Context, RD, Size))
-    return false;
-  return true;
-}
-
-/// Test whether an argument type which is to be passed indirectly (on the
-/// stack) would have the equivalent layout if it was expanded into separate
-/// arguments. If so, we prefer to do the latter to avoid inhibiting
-/// optimizations.
-bool X86_32ABIInfo::canExpandIndirectArgument(QualType Ty) const {
-  // We can only expand structure types.
-  const RecordType *RT = Ty->getAs<RecordType>();
-  if (!RT)
-    return false;
-  const RecordDecl *RD = RT->getDecl();
-  uint64_t Size = 0;
-  if (const CXXRecordDecl *CXXRD = dyn_cast<CXXRecordDecl>(RD)) {
-    if (!IsWin32StructABI) {
-      // On non-Windows, we have to conservatively match our old bitcode
-      // prototypes in order to be ABI-compatible at the bitcode level.
-      if (!CXXRD->isCLike())
-        return false;
-    } else {
-      // Don't do this for dynamic classes.
-      if (CXXRD->isDynamicClass())
-        return false;
-    }
-    if (!addBaseAndFieldSizes(getContext(), CXXRD, Size))
-      return false;
-  } else {
-    if (!addFieldSizes(getContext(), RD, Size))
-      return false;
-  }
-
-  // We can do this if there was no alignment padding.
-  return Size == getContext().getTypeSize(Ty);
-}
-
-ABIArgInfo X86_32ABIInfo::getIndirectReturnResult(QualType RetTy, CCState &State) const {
-  // If the return value is indirect, then the hidden argument is consuming one
-  // integer register.
-  if (State.FreeRegs) {
-    --State.FreeRegs;
-    if (!IsMCUABI)
-      return getNaturalAlignIndirectInReg(RetTy);
-  }
-  return getNaturalAlignIndirect(RetTy, /*ByVal=*/false);
-}
-
-ABIArgInfo X86_32ABIInfo::classifyReturnType(QualType RetTy,
-                                             CCState &State) const {
-  if (RetTy->isVoidType())
-    return ABIArgInfo::getIgnore();
-
-  const Type *Base = nullptr;
-  uint64_t NumElts = 0;
-  if ((State.CC == llvm::CallingConv::X86_VectorCall ||
-       State.CC == llvm::CallingConv::X86_RegCall) &&
-      isHomogeneousAggregate(RetTy, Base, NumElts)) {
-    // The LLVM struct type for such an aggregate should lower properly.
-    return ABIArgInfo::getDirect();
-  }
-
-  if (const VectorType *VT = RetTy->getAs<VectorType>()) {
-    // On Darwin, some vectors are returned in registers.
-    if (IsDarwinVectorABI) {
-      uint64_t Size = getContext().getTypeSize(RetTy);
-
-      // 128-bit vectors are a special case; they are returned in
-      // registers and we need to make sure to pick a type the LLVM
-      // backend will like.
-      if (Size == 128)
-        return ABIArgInfo::getDirect(llvm::FixedVectorType::get(
-            llvm::Type::getInt64Ty(getVMContext()), 2));
-
-      // Always return in register if it fits in a general purpose
-      // register, or if it is 64 bits and has a single element.
-      if ((Size == 8 || Size == 16 || Size == 32) ||
-          (Size == 64 && VT->getNumElements() == 1))
-        return ABIArgInfo::getDirect(llvm::IntegerType::get(getVMContext(),
-                                                            Size));
-
-      return getIndirectReturnResult(RetTy, State);
-    }
-
-    return ABIArgInfo::getDirect();
-  }
-
-  if (isAggregateTypeForABI(RetTy)) {
-    if (const RecordType *RT = RetTy->getAs<RecordType>()) {
-      // Structures with flexible arrays are always indirect.
-      if (RT->getDecl()->hasFlexibleArrayMember())
-        return getIndirectReturnResult(RetTy, State);
-    }
-
-    // If specified, structs and unions are always indirect.
-    if (!IsRetSmallStructInRegABI && !RetTy->isAnyComplexType())
-      return getIndirectReturnResult(RetTy, State);
-
-    // Ignore empty structs/unions.
-    if (isEmptyRecord(getContext(), RetTy, true))
-      return ABIArgInfo::getIgnore();
-
-    // Return complex of _Float16 as <2 x half> so the backend will use xmm0.
-    if (const ComplexType *CT = RetTy->getAs<ComplexType>()) {
-      QualType ET = getContext().getCanonicalType(CT->getElementType());
-      if (ET->isFloat16Type())
-        return ABIArgInfo::getDirect(llvm::FixedVectorType::get(
-            llvm::Type::getHalfTy(getVMContext()), 2));
-    }
-
-    // Small structures which are register sized are generally returned
-    // in a register.
-    if (shouldReturnTypeInRegister(RetTy, getContext())) {
-      uint64_t Size = getContext().getTypeSize(RetTy);
-
-      // As a special-case, if the struct is a "single-element" struct, and
-      // the field is of type "float" or "double", return it in a
-      // floating-point register. (MSVC does not apply this special case.)
-      // We apply a similar transformation for pointer types to improve the
-      // quality of the generated IR.
-      if (const Type *SeltTy = isSingleElementStruct(RetTy, getContext()))
-        if ((!IsWin32StructABI && SeltTy->isRealFloatingType())
-            || SeltTy->hasPointerRepresentation())
-          return ABIArgInfo::getDirect(CGT.ConvertType(QualType(SeltTy, 0)));
-
-      // FIXME: We should be able to narrow this integer in cases with dead
-      // padding.
-      return ABIArgInfo::getDirect(llvm::IntegerType::get(getVMContext(),Size));
-    }
-
-    return getIndirectReturnResult(RetTy, State);
-  }
-
-  // Treat an enum type as its underlying type.
-  if (const EnumType *EnumTy = RetTy->getAs<EnumType>())
-    RetTy = EnumTy->getDecl()->getIntegerType();
-
-  if (const auto *EIT = RetTy->getAs<BitIntType>())
-    if (EIT->getNumBits() > 64)
-      return getIndirectReturnResult(RetTy, State);
-
-  return (isPromotableIntegerTypeForABI(RetTy) ? ABIArgInfo::getExtend(RetTy)
-                                               : ABIArgInfo::getDirect());
-}
-
-static bool isSIMDVectorType(ASTContext &Context, QualType Ty) {
-  return Ty->getAs<VectorType>() && Context.getTypeSize(Ty) == 128;
-}
-
-static bool isRecordWithSIMDVectorType(ASTContext &Context, QualType Ty) {
-  const RecordType *RT = Ty->getAs<RecordType>();
-  if (!RT)
-    return false;
-  const RecordDecl *RD = RT->getDecl();
-
-  // If this is a C++ record, check the bases first.
-  if (const CXXRecordDecl *CXXRD = dyn_cast<CXXRecordDecl>(RD))
-    for (const auto &I : CXXRD->bases())
-      if (!isRecordWithSIMDVectorType(Context, I.getType()))
-        return false;
-
-  for (const auto *i : RD->fields()) {
-    QualType FT = i->getType();
-
-    if (isSIMDVectorType(Context, FT))
-      return true;
-
-    if (isRecordWithSIMDVectorType(Context, FT))
-      return true;
-  }
-
-  return false;
-}
-
-unsigned X86_32ABIInfo::getTypeStackAlignInBytes(QualType Ty,
-                                                 unsigned Align) const {
-  // Otherwise, if the alignment is less than or equal to the minimum ABI
-  // alignment, just use the default; the backend will handle this.
-  if (Align <= MinABIStackAlignInBytes)
-    return 0; // Use default alignment.
-
-  if (IsLinuxABI) {
-    // Exclude other System V OS (e.g Darwin, PS4 and FreeBSD) since we don't
-    // want to spend any effort dealing with the ramifications of ABI breaks.
-    //
-    // If the vector type is __m128/__m256/__m512, return the default alignment.
-    if (Ty->isVectorType() && (Align == 16 || Align == 32 || Align == 64))
-      return Align;
-  }
-  // On non-Darwin, the stack type alignment is always 4.
-  if (!IsDarwinVectorABI) {
-    // Set explicit alignment, since we may need to realign the top.
-    return MinABIStackAlignInBytes;
-  }
-
-  // Otherwise, if the type contains an SSE vector type, the alignment is 16.
-  if (Align >= 16 && (isSIMDVectorType(getContext(), Ty) ||
-                      isRecordWithSIMDVectorType(getContext(), Ty)))
-    return 16;
-
-  return MinABIStackAlignInBytes;
-}
-
-ABIArgInfo X86_32ABIInfo::getIndirectResult(QualType Ty, bool ByVal,
-                                            CCState &State) const {
-  if (!ByVal) {
-    if (State.FreeRegs) {
-      --State.FreeRegs; // Non-byval indirects just use one pointer.
-      if (!IsMCUABI)
-        return getNaturalAlignIndirectInReg(Ty);
-    }
-    return getNaturalAlignIndirect(Ty, false);
-  }
-
-  // Compute the byval alignment.
-  unsigned TypeAlign = getContext().getTypeAlign(Ty) / 8;
-  unsigned StackAlign = getTypeStackAlignInBytes(Ty, TypeAlign);
-  if (StackAlign == 0)
-    return ABIArgInfo::getIndirect(CharUnits::fromQuantity(4), /*ByVal=*/true);
-
-  // If the stack alignment is less than the type alignment, realign the
-  // argument.
-  bool Realign = TypeAlign > StackAlign;
-  return ABIArgInfo::getIndirect(CharUnits::fromQuantity(StackAlign),
-                                 /*ByVal=*/true, Realign);
-}
-
-X86_32ABIInfo::Class X86_32ABIInfo::classify(QualType Ty) const {
-  const Type *T = isSingleElementStruct(Ty, getContext());
-  if (!T)
-    T = Ty.getTypePtr();
-
-  if (const BuiltinType *BT = T->getAs<BuiltinType>()) {
-    BuiltinType::Kind K = BT->getKind();
-    if (K == BuiltinType::Float || K == BuiltinType::Double)
-      return Float;
-  }
-  return Integer;
-}
-
-bool X86_32ABIInfo::updateFreeRegs(QualType Ty, CCState &State) const {
-  if (!IsSoftFloatABI) {
-    Class C = classify(Ty);
-    if (C == Float)
-      return false;
-  }
-
-  unsigned Size = getContext().getTypeSize(Ty);
-  unsigned SizeInRegs = (Size + 31) / 32;
-
-  if (SizeInRegs == 0)
-    return false;
-
-  if (!IsMCUABI) {
-    if (SizeInRegs > State.FreeRegs) {
-      State.FreeRegs = 0;
-      return false;
-    }
-  } else {
-    // The MCU psABI allows passing parameters in-reg even if there are
-    // earlier parameters that are passed on the stack. Also,
-    // it does not allow passing >8-byte structs in-register,
-    // even if there are 3 free registers available.
-    if (SizeInRegs > State.FreeRegs || SizeInRegs > 2)
-      return false;
-  }
-
-  State.FreeRegs -= SizeInRegs;
-  return true;
-}
-
-bool X86_32ABIInfo::shouldAggregateUseDirect(QualType Ty, CCState &State,
-                                             bool &InReg,
-                                             bool &NeedsPadding) const {
-  // On Windows, aggregates other than HFAs are never passed in registers, and
-  // they do not consume register slots. Homogenous floating-point aggregates
-  // (HFAs) have already been dealt with at this point.
-  if (IsWin32StructABI && isAggregateTypeForABI(Ty))
-    return false;
-
-  NeedsPadding = false;
-  InReg = !IsMCUABI;
-
-  if (!updateFreeRegs(Ty, State))
-    return false;
-
-  if (IsMCUABI)
-    return true;
-
-  if (State.CC == llvm::CallingConv::X86_FastCall ||
-      State.CC == llvm::CallingConv::X86_VectorCall ||
-      State.CC == llvm::CallingConv::X86_RegCall) {
-    if (getContext().getTypeSize(Ty) <= 32 && State.FreeRegs)
-      NeedsPadding = true;
-
-    return false;
-  }
-
-  return true;
-}
-
-bool X86_32ABIInfo::shouldPrimitiveUseInReg(QualType Ty, CCState &State) const {
-  bool IsPtrOrInt = (getContext().getTypeSize(Ty) <= 32) &&
-                    (Ty->isIntegralOrEnumerationType() || Ty->isPointerType() ||
-                     Ty->isReferenceType());
-
-  if (!IsPtrOrInt && (State.CC == llvm::CallingConv::X86_FastCall ||
-                      State.CC == llvm::CallingConv::X86_VectorCall))
-    return false;
-
-  if (!updateFreeRegs(Ty, State))
-    return false;
-
-  if (!IsPtrOrInt && State.CC == llvm::CallingConv::X86_RegCall)
-    return false;
-
-  // Return true to apply inreg to all legal parameters except for MCU targets.
-  return !IsMCUABI;
-}
-
-void X86_32ABIInfo::runVectorCallFirstPass(CGFunctionInfo &FI, CCState &State) const {
-  // Vectorcall x86 works subtly different than in x64, so the format is
-  // a bit different than the x64 version.  First, all vector types (not HVAs)
-  // are assigned, with the first 6 ending up in the [XYZ]MM0-5 registers.
-  // This differs from the x64 implementation, where the first 6 by INDEX get
-  // registers.
-  // In the second pass over the arguments, HVAs are passed in the remaining
-  // vector registers if possible, or indirectly by address. The address will be
-  // passed in ECX/EDX if available. Any other arguments are passed according to
-  // the usual fastcall rules.
-  MutableArrayRef<CGFunctionInfoArgInfo> Args = FI.arguments();
-  for (int I = 0, E = Args.size(); I < E; ++I) {
-    const Type *Base = nullptr;
-    uint64_t NumElts = 0;
-    const QualType &Ty = Args[I].type;
-    if ((Ty->isVectorType() || Ty->isBuiltinType()) &&
-        isHomogeneousAggregate(Ty, Base, NumElts)) {
-      if (State.FreeSSERegs >= NumElts) {
-        State.FreeSSERegs -= NumElts;
-        Args[I].info = ABIArgInfo::getDirectInReg();
-        State.IsPreassigned.set(I);
-      }
-    }
-  }
-}
-
-ABIArgInfo X86_32ABIInfo::classifyArgumentType(QualType Ty,
-                                               CCState &State) const {
-  // FIXME: Set alignment on indirect arguments.
-  bool IsFastCall = State.CC == llvm::CallingConv::X86_FastCall;
-  bool IsRegCall = State.CC == llvm::CallingConv::X86_RegCall;
-  bool IsVectorCall = State.CC == llvm::CallingConv::X86_VectorCall;
-
-  Ty = useFirstFieldIfTransparentUnion(Ty);
-  TypeInfo TI = getContext().getTypeInfo(Ty);
-
-  // Check with the C++ ABI first.
-  const RecordType *RT = Ty->getAs<RecordType>();
-  if (RT) {
-    CGCXXABI::RecordArgABI RAA = getRecordArgABI(RT, getCXXABI());
-    if (RAA == CGCXXABI::RAA_Indirect) {
-      return getIndirectResult(Ty, false, State);
-    } else if (RAA == CGCXXABI::RAA_DirectInMemory) {
-      // The field index doesn't matter, we'll fix it up later.
-      return ABIArgInfo::getInAlloca(/*FieldIndex=*/0);
-    }
-  }
-
-  // Regcall uses the concept of a homogenous vector aggregate, similar
-  // to other targets.
-  const Type *Base = nullptr;
-  uint64_t NumElts = 0;
-  if ((IsRegCall || IsVectorCall) &&
-      isHomogeneousAggregate(Ty, Base, NumElts)) {
-    if (State.FreeSSERegs >= NumElts) {
-      State.FreeSSERegs -= NumElts;
-
-      // Vectorcall passes HVAs directly and does not flatten them, but regcall
-      // does.
-      if (IsVectorCall)
-        return getDirectX86Hva();
-
-      if (Ty->isBuiltinType() || Ty->isVectorType())
-        return ABIArgInfo::getDirect();
-      return ABIArgInfo::getExpand();
-    }
-    return getIndirectResult(Ty, /*ByVal=*/false, State);
-  }
-
-  if (isAggregateTypeForABI(Ty)) {
-    // Structures with flexible arrays are always indirect.
-    // FIXME: This should not be byval!
-    if (RT && RT->getDecl()->hasFlexibleArrayMember())
-      return getIndirectResult(Ty, true, State);
-
-    // Ignore empty structs/unions on non-Windows.
-    if (!IsWin32StructABI && isEmptyRecord(getContext(), Ty, true))
-      return ABIArgInfo::getIgnore();
-
-    llvm::LLVMContext &LLVMContext = getVMContext();
-    llvm::IntegerType *Int32 = llvm::Type::getInt32Ty(LLVMContext);
-    bool NeedsPadding = false;
-    bool InReg;
-    if (shouldAggregateUseDirect(Ty, State, InReg, NeedsPadding)) {
-      unsigned SizeInRegs = (TI.Width + 31) / 32;
-      SmallVector<llvm::Type*, 3> Elements(SizeInRegs, Int32);
-      llvm::Type *Result = llvm::StructType::get(LLVMContext, Elements);
-      if (InReg)
-        return ABIArgInfo::getDirectInReg(Result);
-      else
-        return ABIArgInfo::getDirect(Result);
-    }
-    llvm::IntegerType *PaddingType = NeedsPadding ? Int32 : nullptr;
-
-    // Pass over-aligned aggregates on Windows indirectly. This behavior was
-    // added in MSVC 2015.
-    if (IsWin32StructABI && TI.isAlignRequired() && TI.Align > 32)
-      return getIndirectResult(Ty, /*ByVal=*/false, State);
-
-    // Expand small (<= 128-bit) record types when we know that the stack layout
-    // of those arguments will match the struct. This is important because the
-    // LLVM backend isn't smart enough to remove byval, which inhibits many
-    // optimizations.
-    // Don't do this for the MCU if there are still free integer registers
-    // (see X86_64 ABI for full explanation).
-    if (TI.Width <= 4 * 32 && (!IsMCUABI || State.FreeRegs == 0) &&
-        canExpandIndirectArgument(Ty))
-      return ABIArgInfo::getExpandWithPadding(
-          IsFastCall || IsVectorCall || IsRegCall, PaddingType);
-
-    return getIndirectResult(Ty, true, State);
-  }
-
-  if (const VectorType *VT = Ty->getAs<VectorType>()) {
-    // On Windows, vectors are passed directly if registers are available, or
-    // indirectly if not. This avoids the need to align argument memory. Pass
-    // user-defined vector types larger than 512 bits indirectly for simplicity.
-    if (IsWin32StructABI) {
-      if (TI.Width <= 512 && State.FreeSSERegs > 0) {
-        --State.FreeSSERegs;
-        return ABIArgInfo::getDirectInReg();
-      }
-      return getIndirectResult(Ty, /*ByVal=*/false, State);
-    }
-
-    // On Darwin, some vectors are passed in memory, we handle this by passing
-    // it as an i8/i16/i32/i64.
-    if (IsDarwinVectorABI) {
-      if ((TI.Width == 8 || TI.Width == 16 || TI.Width == 32) ||
-          (TI.Width == 64 && VT->getNumElements() == 1))
-        return ABIArgInfo::getDirect(
-            llvm::IntegerType::get(getVMContext(), TI.Width));
-    }
-
-    if (IsX86_MMXType(CGT.ConvertType(Ty)))
-      return ABIArgInfo::getDirect(llvm::IntegerType::get(getVMContext(), 64));
-
-    return ABIArgInfo::getDirect();
-  }
-
-
-  if (const EnumType *EnumTy = Ty->getAs<EnumType>())
-    Ty = EnumTy->getDecl()->getIntegerType();
-
-  bool InReg = shouldPrimitiveUseInReg(Ty, State);
-
-  if (isPromotableIntegerTypeForABI(Ty)) {
-    if (InReg)
-      return ABIArgInfo::getExtendInReg(Ty);
-    return ABIArgInfo::getExtend(Ty);
-  }
-
-  if (const auto *EIT = Ty->getAs<BitIntType>()) {
-    if (EIT->getNumBits() <= 64) {
-      if (InReg)
-        return ABIArgInfo::getDirectInReg();
-      return ABIArgInfo::getDirect();
-    }
-    return getIndirectResult(Ty, /*ByVal=*/false, State);
-  }
-
-  if (InReg)
-    return ABIArgInfo::getDirectInReg();
-  return ABIArgInfo::getDirect();
-}
-
-void X86_32ABIInfo::computeInfo(CGFunctionInfo &FI) const {
-  CCState State(FI);
-  if (IsMCUABI)
-    State.FreeRegs = 3;
-  else if (State.CC == llvm::CallingConv::X86_FastCall) {
-    State.FreeRegs = 2;
-    State.FreeSSERegs = 3;
-  } else if (State.CC == llvm::CallingConv::X86_VectorCall) {
-    State.FreeRegs = 2;
-    State.FreeSSERegs = 6;
-  } else if (FI.getHasRegParm())
-    State.FreeRegs = FI.getRegParm();
-  else if (State.CC == llvm::CallingConv::X86_RegCall) {
-    State.FreeRegs = 5;
-    State.FreeSSERegs = 8;
-  } else if (IsWin32StructABI) {
-    // Since MSVC 2015, the first three SSE vectors have been passed in
-    // registers. The rest are passed indirectly.
-    State.FreeRegs = DefaultNumRegisterParameters;
-    State.FreeSSERegs = 3;
-  } else
-    State.FreeRegs = DefaultNumRegisterParameters;
-
-  if (!::classifyReturnType(getCXXABI(), FI, *this)) {
-    FI.getReturnInfo() = classifyReturnType(FI.getReturnType(), State);
-  } else if (FI.getReturnInfo().isIndirect()) {
-    // The C++ ABI is not aware of register usage, so we have to check if the
-    // return value was sret and put it in a register ourselves if appropriate.
-    if (State.FreeRegs) {
-      --State.FreeRegs;  // The sret parameter consumes a register.
-      if (!IsMCUABI)
-        FI.getReturnInfo().setInReg(true);
-    }
-  }
-
-  // The chain argument effectively gives us another free register.
-  if (FI.isChainCall())
-    ++State.FreeRegs;
-
-  // For vectorcall, do a first pass over the arguments, assigning FP and vector
-  // arguments to XMM registers as available.
-  if (State.CC == llvm::CallingConv::X86_VectorCall)
-    runVectorCallFirstPass(FI, State);
-
-  bool UsedInAlloca = false;
-  MutableArrayRef<CGFunctionInfoArgInfo> Args = FI.arguments();
-  for (int I = 0, E = Args.size(); I < E; ++I) {
-    // Skip arguments that have already been assigned.
-    if (State.IsPreassigned.test(I))
-      continue;
-
-    Args[I].info = classifyArgumentType(Args[I].type, State);
-    UsedInAlloca |= (Args[I].info.getKind() == ABIArgInfo::InAlloca);
-  }
-
-  // If we needed to use inalloca for any argument, do a second pass and rewrite
-  // all the memory arguments to use inalloca.
-  if (UsedInAlloca)
-    rewriteWithInAlloca(FI);
-}
-
-void
-X86_32ABIInfo::addFieldToArgStruct(SmallVector<llvm::Type *, 6> &FrameFields,
-                                   CharUnits &StackOffset, ABIArgInfo &Info,
-                                   QualType Type) const {
-  // Arguments are always 4-byte-aligned.
-  CharUnits WordSize = CharUnits::fromQuantity(4);
-  assert(StackOffset.isMultipleOf(WordSize) && "unaligned inalloca struct");
-
-  // sret pointers and indirect things will require an extra pointer
-  // indirection, unless they are byval. Most things are byval, and will not
-  // require this indirection.
-  bool IsIndirect = false;
-  if (Info.isIndirect() && !Info.getIndirectByVal())
-    IsIndirect = true;
-  Info = ABIArgInfo::getInAlloca(FrameFields.size(), IsIndirect);
-  llvm::Type *LLTy = CGT.ConvertTypeForMem(Type);
-  if (IsIndirect)
-    LLTy = LLTy->getPointerTo(0);
-  FrameFields.push_back(LLTy);
-  StackOffset += IsIndirect ? WordSize : getContext().getTypeSizeInChars(Type);
-
-  // Insert padding bytes to respect alignment.
-  CharUnits FieldEnd = StackOffset;
-  StackOffset = FieldEnd.alignTo(WordSize);
-  if (StackOffset != FieldEnd) {
-    CharUnits NumBytes = StackOffset - FieldEnd;
-    llvm::Type *Ty = llvm::Type::getInt8Ty(getVMContext());
-    Ty = llvm::ArrayType::get(Ty, NumBytes.getQuantity());
-    FrameFields.push_back(Ty);
-  }
-}
-
-static bool isArgInAlloca(const ABIArgInfo &Info) {
-  // Leave ignored and inreg arguments alone.
-  switch (Info.getKind()) {
-  case ABIArgInfo::InAlloca:
-    return true;
-  case ABIArgInfo::Ignore:
-  case ABIArgInfo::IndirectAliased:
-    return false;
-  case ABIArgInfo::Indirect:
-  case ABIArgInfo::Direct:
-  case ABIArgInfo::Extend:
-    return !Info.getInReg();
-  case ABIArgInfo::Expand:
-  case ABIArgInfo::CoerceAndExpand:
-    // These are aggregate types which are never passed in registers when
-    // inalloca is involved.
-    return true;
-  }
-  llvm_unreachable("invalid enum");
-}
-
-void X86_32ABIInfo::rewriteWithInAlloca(CGFunctionInfo &FI) const {
-  assert(IsWin32StructABI && "inalloca only supported on win32");
-
-  // Build a packed struct type for all of the arguments in memory.
-  SmallVector<llvm::Type *, 6> FrameFields;
-
-  // The stack alignment is always 4.
-  CharUnits StackAlign = CharUnits::fromQuantity(4);
-
-  CharUnits StackOffset;
-  CGFunctionInfo::arg_iterator I = FI.arg_begin(), E = FI.arg_end();
-
-  // Put 'this' into the struct before 'sret', if necessary.
-  bool IsThisCall =
-      FI.getCallingConvention() == llvm::CallingConv::X86_ThisCall;
-  ABIArgInfo &Ret = FI.getReturnInfo();
-  if (Ret.isIndirect() && Ret.isSRetAfterThis() && !IsThisCall &&
-      isArgInAlloca(I->info)) {
-    addFieldToArgStruct(FrameFields, StackOffset, I->info, I->type);
-    ++I;
-  }
-
-  // Put the sret parameter into the inalloca struct if it's in memory.
-  if (Ret.isIndirect() && !Ret.getInReg()) {
-    addFieldToArgStruct(FrameFields, StackOffset, Ret, FI.getReturnType());
-    // On Windows, the hidden sret parameter is always returned in eax.
-    Ret.setInAllocaSRet(IsWin32StructABI);
-  }
-
-  // Skip the 'this' parameter in ecx.
-  if (IsThisCall)
-    ++I;
-
-  // Put arguments passed in memory into the struct.
-  for (; I != E; ++I) {
-    if (isArgInAlloca(I->info))
-      addFieldToArgStruct(FrameFields, StackOffset, I->info, I->type);
-  }
-
-  FI.setArgStruct(llvm::StructType::get(getVMContext(), FrameFields,
-                                        /*isPacked=*/true),
-                  StackAlign);
-}
-
-Address X86_32ABIInfo::EmitVAArg(CodeGenFunction &CGF,
-                                 Address VAListAddr, QualType Ty) const {
-
-  auto TypeInfo = getContext().getTypeInfoInChars(Ty);
-
-  // x86-32 changes the alignment of certain arguments on the stack.
-  //
-  // Just messing with TypeInfo like this works because we never pass
-  // anything indirectly.
-  TypeInfo.Align = CharUnits::fromQuantity(
-                getTypeStackAlignInBytes(Ty, TypeInfo.Align.getQuantity()));
-
-  return emitVoidPtrVAArg(CGF, VAListAddr, Ty, /*Indirect*/ false,
-                          TypeInfo, CharUnits::fromQuantity(4),
-                          /*AllowHigherAlign*/ true);
-}
-
-bool X86_32TargetCodeGenInfo::isStructReturnInRegABI(
-    const llvm::Triple &Triple, const CodeGenOptions &Opts) {
-  assert(Triple.getArch() == llvm::Triple::x86);
-
-  switch (Opts.getStructReturnConvention()) {
-  case CodeGenOptions::SRCK_Default:
-    break;
-  case CodeGenOptions::SRCK_OnStack:  // -fpcc-struct-return
-    return false;
-  case CodeGenOptions::SRCK_InRegs:  // -freg-struct-return
-    return true;
-  }
-
-  if (Triple.isOSDarwin() || Triple.isOSIAMCU())
-    return true;
-
-  switch (Triple.getOS()) {
-  case llvm::Triple::DragonFly:
-  case llvm::Triple::FreeBSD:
-  case llvm::Triple::OpenBSD:
-  case llvm::Triple::Win32:
-    return true;
-  default:
-    return false;
-  }
-}
-
-static void addX86InterruptAttrs(const FunctionDecl *FD, llvm::GlobalValue *GV,
-                                 CodeGen::CodeGenModule &CGM) {
-  if (!FD->hasAttr<AnyX86InterruptAttr>())
-    return;
-
-  llvm::Function *Fn = cast<llvm::Function>(GV);
-  Fn->setCallingConv(llvm::CallingConv::X86_INTR);
-  if (FD->getNumParams() == 0)
-    return;
-
-  auto PtrTy = cast<PointerType>(FD->getParamDecl(0)->getType());
-  llvm::Type *ByValTy = CGM.getTypes().ConvertType(PtrTy->getPointeeType());
-  llvm::Attribute NewAttr = llvm::Attribute::getWithByValType(
-    Fn->getContext(), ByValTy);
-  Fn->addParamAttr(0, NewAttr);
-}
-
-void X86_32TargetCodeGenInfo::setTargetAttributes(
-    const Decl *D, llvm::GlobalValue *GV, CodeGen::CodeGenModule &CGM) const {
-  if (GV->isDeclaration())
-    return;
-  if (const FunctionDecl *FD = dyn_cast_or_null<FunctionDecl>(D)) {
-    if (FD->hasAttr<X86ForceAlignArgPointerAttr>()) {
-      llvm::Function *Fn = cast<llvm::Function>(GV);
-      Fn->addFnAttr("stackrealign");
-    }
-
-    addX86InterruptAttrs(FD, GV, CGM);
-  }
-}
-
-bool X86_32TargetCodeGenInfo::initDwarfEHRegSizeTable(
-                                               CodeGen::CodeGenFunction &CGF,
-                                               llvm::Value *Address) const {
-  CodeGen::CGBuilderTy &Builder = CGF.Builder;
-
-  llvm::Value *Four8 = llvm::ConstantInt::get(CGF.Int8Ty, 4);
-
-  // 0-7 are the eight integer registers;  the order is different
-  //   on Darwin (for EH), but the range is the same.
-  // 8 is %eip.
-  AssignToArrayRange(Builder, Address, Four8, 0, 8);
-
-  if (CGF.CGM.getTarget().getTriple().isOSDarwin()) {
-    // 12-16 are st(0..4).  Not sure why we stop at 4.
-    // These have size 16, which is sizeof(long double) on
-    // platforms with 8-byte alignment for that type.
-    llvm::Value *Sixteen8 = llvm::ConstantInt::get(CGF.Int8Ty, 16);
-    AssignToArrayRange(Builder, Address, Sixteen8, 12, 16);
-
-  } else {
-    // 9 is %eflags, which doesn't get a size on Darwin for some
-    // reason.
-    Builder.CreateAlignedStore(
-        Four8, Builder.CreateConstInBoundsGEP1_32(CGF.Int8Ty, Address, 9),
-                               CharUnits::One());
-
-    // 11-16 are st(0..5).  Not sure why we stop at 5.
-    // These have size 12, which is sizeof(long double) on
-    // platforms with 4-byte alignment for that type.
-    llvm::Value *Twelve8 = llvm::ConstantInt::get(CGF.Int8Ty, 12);
-    AssignToArrayRange(Builder, Address, Twelve8, 11, 16);
-  }
-
-  return false;
-}
-
-//===----------------------------------------------------------------------===//
-// X86-64 ABI Implementation
-//===----------------------------------------------------------------------===//
-
-
-namespace {
-/// The AVX ABI level for X86 targets.
-enum class X86AVXABILevel {
-  None,
-  AVX,
-  AVX512
-};
-
-/// \p returns the size in bits of the largest (native) vector for \p AVXLevel.
-static unsigned getNativeVectorSizeForAVXABI(X86AVXABILevel AVXLevel) {
-  switch (AVXLevel) {
-  case X86AVXABILevel::AVX512:
-    return 512;
-  case X86AVXABILevel::AVX:
-    return 256;
-  case X86AVXABILevel::None:
-    return 128;
-  }
-  llvm_unreachable("Unknown AVXLevel");
-}
-
-/// X86_64ABIInfo - The X86_64 ABI information.
-class X86_64ABIInfo : public ABIInfo {
-  enum Class {
-    Integer = 0,
-    SSE,
-    SSEUp,
-    X87,
-    X87Up,
-    ComplexX87,
-    NoClass,
-    Memory
-  };
-
-  /// merge - Implement the X86_64 ABI merging algorithm.
-  ///
-  /// Merge an accumulating classification \arg Accum with a field
-  /// classification \arg Field.
-  ///
-  /// \param Accum - The accumulating classification. This should
-  /// always be either NoClass or the result of a previous merge
-  /// call. In addition, this should never be Memory (the caller
-  /// should just return Memory for the aggregate).
-  static Class merge(Class Accum, Class Field);
-
-  /// postMerge - Implement the X86_64 ABI post merging algorithm.
-  ///
-  /// Post merger cleanup, reduces a malformed Hi and Lo pair to
-  /// final MEMORY or SSE classes when necessary.
-  ///
-  /// \param AggregateSize - The size of the current aggregate in
-  /// the classification process.
-  ///
-  /// \param Lo - The classification for the parts of the type
-  /// residing in the low word of the containing object.
-  ///
-  /// \param Hi - The classification for the parts of the type
-  /// residing in the higher words of the containing object.
-  ///
-  void postMerge(unsigned AggregateSize, Class &Lo, Class &Hi) const;
-
-  /// classify - Determine the x86_64 register classes in which the
-  /// given type T should be passed.
-  ///
-  /// \param Lo - The classification for the parts of the type
-  /// residing in the low word of the containing object.
-  ///
-  /// \param Hi - The classification for the parts of the type
-  /// residing in the high word of the containing object.
-  ///
-  /// \param OffsetBase - The bit offset of this type in the
-  /// containing object.  Some parameters are classified different
-  /// depending on whether they straddle an eightbyte boundary.
-  ///
-  /// \param isNamedArg - Whether the argument in question is a "named"
-  /// argument, as used in AMD64-ABI 3.5.7.
-  ///
-  /// \param IsRegCall - Whether the calling conversion is regcall.
-  ///
-  /// If a word is unused its result will be NoClass; if a type should
-  /// be passed in Memory then at least the classification of \arg Lo
-  /// will be Memory.
-  ///
-  /// The \arg Lo class will be NoClass iff the argument is ignored.
-  ///
-  /// If the \arg Lo class is ComplexX87, then the \arg Hi class will
-  /// also be ComplexX87.
-  void classify(QualType T, uint64_t OffsetBase, Class &Lo, Class &Hi,
-                bool isNamedArg, bool IsRegCall = false) const;
-
-  llvm::Type *GetByteVectorType(QualType Ty) const;
-  llvm::Type *GetSSETypeAtOffset(llvm::Type *IRType,
-                                 unsigned IROffset, QualType SourceTy,
-                                 unsigned SourceOffset) const;
-  llvm::Type *GetINTEGERTypeAtOffset(llvm::Type *IRType,
-                                     unsigned IROffset, QualType SourceTy,
-                                     unsigned SourceOffset) const;
-
-  /// getIndirectResult - Give a source type \arg Ty, return a suitable result
-  /// such that the argument will be returned in memory.
-  ABIArgInfo getIndirectReturnResult(QualType Ty) const;
-
-  /// getIndirectResult - Give a source type \arg Ty, return a suitable result
-  /// such that the argument will be passed in memory.
-  ///
-  /// \param freeIntRegs - The number of free integer registers remaining
-  /// available.
-  ABIArgInfo getIndirectResult(QualType Ty, unsigned freeIntRegs) const;
-
-  ABIArgInfo classifyReturnType(QualType RetTy) const;
-
-  ABIArgInfo classifyArgumentType(QualType Ty, unsigned freeIntRegs,
-                                  unsigned &neededInt, unsigned &neededSSE,
-                                  bool isNamedArg,
-                                  bool IsRegCall = false) const;
-
-  ABIArgInfo classifyRegCallStructType(QualType Ty, unsigned &NeededInt,
-                                       unsigned &NeededSSE,
-                                       unsigned &MaxVectorWidth) const;
-
-  ABIArgInfo classifyRegCallStructTypeImpl(QualType Ty, unsigned &NeededInt,
-                                           unsigned &NeededSSE,
-                                           unsigned &MaxVectorWidth) const;
-
-  bool IsIllegalVectorType(QualType Ty) const;
-
-  /// The 0.98 ABI revision clarified a lot of ambiguities,
-  /// unfortunately in ways that were not always consistent with
-  /// certain previous compilers.  In particular, platforms which
-  /// required strict binary compatibility with older versions of GCC
-  /// may need to exempt themselves.
-  bool honorsRevision0_98() const {
-    return !getTarget().getTriple().isOSDarwin();
-  }
-
-  /// GCC classifies <1 x long long> as SSE but some platform ABIs choose to
-  /// classify it as INTEGER (for compatibility with older clang compilers).
-  bool classifyIntegerMMXAsSSE() const {
-    // Clang <= 3.8 did not do this.
-    if (getContext().getLangOpts().getClangABICompat() <=
-        LangOptions::ClangABI::Ver3_8)
-      return false;
-
-    const llvm::Triple &Triple = getTarget().getTriple();
-    if (Triple.isOSDarwin() || Triple.isPS() || Triple.isOSFreeBSD())
-      return false;
-    return true;
-  }
-
-  // GCC classifies vectors of __int128 as memory.
-  bool passInt128VectorsInMem() const {
-    // Clang <= 9.0 did not do this.
-    if (getContext().getLangOpts().getClangABICompat() <=
-        LangOptions::ClangABI::Ver9)
-      return false;
-
-    const llvm::Triple &T = getTarget().getTriple();
-    return T.isOSLinux() || T.isOSNetBSD();
-  }
-
-  X86AVXABILevel AVXLevel;
-  // Some ABIs (e.g. X32 ABI and Native Client OS) use 32 bit pointers on
-  // 64-bit hardware.
-  bool Has64BitPointers;
-
-public:
-  X86_64ABIInfo(CodeGen::CodeGenTypes &CGT, X86AVXABILevel AVXLevel)
-      : ABIInfo(CGT), AVXLevel(AVXLevel),
-        Has64BitPointers(CGT.getDataLayout().getPointerSize(0) == 8) {}
-
-  bool isPassedUsingAVXType(QualType type) const {
-    unsigned neededInt, neededSSE;
-    // The freeIntRegs argument doesn't matter here.
-    ABIArgInfo info = classifyArgumentType(type, 0, neededInt, neededSSE,
-                                           /*isNamedArg*/true);
-    if (info.isDirect()) {
-      llvm::Type *ty = info.getCoerceToType();
-      if (llvm::VectorType *vectorTy = dyn_cast_or_null<llvm::VectorType>(ty))
-        return vectorTy->getPrimitiveSizeInBits().getFixedValue() > 128;
-    }
-    return false;
-  }
-
-  void computeInfo(CGFunctionInfo &FI) const override;
-
-  Address EmitVAArg(CodeGenFunction &CGF, Address VAListAddr,
-                    QualType Ty) const override;
-  Address EmitMSVAArg(CodeGenFunction &CGF, Address VAListAddr,
-                      QualType Ty) const override;
-
-  bool has64BitPointers() const {
-    return Has64BitPointers;
-  }
-};
-
-/// WinX86_64ABIInfo - The Windows X86_64 ABI information.
-class WinX86_64ABIInfo : public ABIInfo {
-public:
-  WinX86_64ABIInfo(CodeGen::CodeGenTypes &CGT, X86AVXABILevel AVXLevel)
-      : ABIInfo(CGT), AVXLevel(AVXLevel),
-        IsMingw64(getTarget().getTriple().isWindowsGNUEnvironment()) {}
-
-  void computeInfo(CGFunctionInfo &FI) const override;
-
-  Address EmitVAArg(CodeGenFunction &CGF, Address VAListAddr,
-                    QualType Ty) const override;
-
-  bool isHomogeneousAggregateBaseType(QualType Ty) const override {
-    // FIXME: Assumes vectorcall is in use.
-    return isX86VectorTypeForVectorCall(getContext(), Ty);
-  }
-
-  bool isHomogeneousAggregateSmallEnough(const Type *Ty,
-                                         uint64_t NumMembers) const override {
-    // FIXME: Assumes vectorcall is in use.
-    return isX86VectorCallAggregateSmallEnough(NumMembers);
-  }
-
-private:
-  ABIArgInfo classify(QualType Ty, unsigned &FreeSSERegs, bool IsReturnType,
-                      bool IsVectorCall, bool IsRegCall) const;
-  ABIArgInfo reclassifyHvaArgForVectorCall(QualType Ty, unsigned &FreeSSERegs,
-                                           const ABIArgInfo &current) const;
-
-  X86AVXABILevel AVXLevel;
-
-  bool IsMingw64;
-};
-
-class X86_64TargetCodeGenInfo : public TargetCodeGenInfo {
-public:
-  X86_64TargetCodeGenInfo(CodeGen::CodeGenTypes &CGT, X86AVXABILevel AVXLevel)
-      : TargetCodeGenInfo(std::make_unique<X86_64ABIInfo>(CGT, AVXLevel)) {
-    SwiftInfo =
-        std::make_unique<SwiftABIInfo>(CGT, /*SwiftErrorInRegister=*/true);
-  }
-
-  /// Disable tail call on x86-64. The epilogue code before the tail jump blocks
-  /// autoreleaseRV/retainRV and autoreleaseRV/unsafeClaimRV optimizations.
-  bool markARCOptimizedReturnCallsAsNoTail() const override { return true; }
-
-  int getDwarfEHStackPointer(CodeGen::CodeGenModule &CGM) const override {
-    return 7;
-  }
-
-  bool initDwarfEHRegSizeTable(CodeGen::CodeGenFunction &CGF,
-                               llvm::Value *Address) const override {
-    llvm::Value *Eight8 = llvm::ConstantInt::get(CGF.Int8Ty, 8);
-
-    // 0-15 are the 16 integer registers.
-    // 16 is %rip.
-    AssignToArrayRange(CGF.Builder, Address, Eight8, 0, 16);
-    return false;
-  }
-
-  llvm::Type* adjustInlineAsmType(CodeGen::CodeGenFunction &CGF,
-                                  StringRef Constraint,
-                                  llvm::Type* Ty) const override {
-    return X86AdjustInlineAsmType(CGF, Constraint, Ty);
-  }
-
-  bool isNoProtoCallVariadic(const CallArgList &args,
-                             const FunctionNoProtoType *fnType) const override {
-    // The default CC on x86-64 sets %al to the number of SSA
-    // registers used, and GCC sets this when calling an unprototyped
-    // function, so we override the default behavior.  However, don't do
-    // that when AVX types are involved: the ABI explicitly states it is
-    // undefined, and it doesn't work in practice because of how the ABI
-    // defines varargs anyway.
-    if (fnType->getCallConv() == CC_C) {
-      bool HasAVXType = false;
-      for (CallArgList::const_iterator
-             it = args.begin(), ie = args.end(); it != ie; ++it) {
-        if (static_cast<const X86_64ABIInfo &>(TargetCodeGenInfo::getABIInfo())
-                .isPassedUsingAVXType(it->Ty)) {
-          HasAVXType = true;
-          break;
-        }
-      }
-
-      if (!HasAVXType)
-        return true;
-    }
-
-    return TargetCodeGenInfo::isNoProtoCallVariadic(args, fnType);
-  }
-
-  llvm::Constant *
-  getUBSanFunctionSignature(CodeGen::CodeGenModule &CGM) const override {
-    unsigned Sig = (0xeb << 0) | // jmp rel8
-                   (0x06 << 8) | //           .+0x08
-                   ('v' << 16) |
-                   ('2' << 24);
-    return llvm::ConstantInt::get(CGM.Int32Ty, Sig);
-  }
-
-  void setTargetAttributes(const Decl *D, llvm::GlobalValue *GV,
-                           CodeGen::CodeGenModule &CGM) const override {
-    if (GV->isDeclaration())
-      return;
-    if (const FunctionDecl *FD = dyn_cast_or_null<FunctionDecl>(D)) {
-      if (FD->hasAttr<X86ForceAlignArgPointerAttr>()) {
-        llvm::Function *Fn = cast<llvm::Function>(GV);
-        Fn->addFnAttr("stackrealign");
-      }
-
-      addX86InterruptAttrs(FD, GV, CGM);
-    }
-  }
-
-  void checkFunctionCallABI(CodeGenModule &CGM, SourceLocation CallLoc,
-                            const FunctionDecl *Caller,
-                            const FunctionDecl *Callee,
-                            const CallArgList &Args) const override;
-};
-
-static void initFeatureMaps(const ASTContext &Ctx,
-                            llvm::StringMap<bool> &CallerMap,
-                            const FunctionDecl *Caller,
-                            llvm::StringMap<bool> &CalleeMap,
-                            const FunctionDecl *Callee) {
-  if (CalleeMap.empty() && CallerMap.empty()) {
-    // The caller is potentially nullptr in the case where the call isn't in a
-    // function.  In this case, the getFunctionFeatureMap ensures we just get
-    // the TU level setting (since it cannot be modified by 'target'..
-    Ctx.getFunctionFeatureMap(CallerMap, Caller);
-    Ctx.getFunctionFeatureMap(CalleeMap, Callee);
-  }
-}
-
-static bool checkAVXParamFeature(DiagnosticsEngine &Diag,
-                                 SourceLocation CallLoc,
-                                 const llvm::StringMap<bool> &CallerMap,
-                                 const llvm::StringMap<bool> &CalleeMap,
-                                 QualType Ty, StringRef Feature,
-                                 bool IsArgument) {
-  bool CallerHasFeat = CallerMap.lookup(Feature);
-  bool CalleeHasFeat = CalleeMap.lookup(Feature);
-  if (!CallerHasFeat && !CalleeHasFeat)
-    return Diag.Report(CallLoc, diag::warn_avx_calling_convention)
-           << IsArgument << Ty << Feature;
-
-  // Mixing calling conventions here is very clearly an error.
-  if (!CallerHasFeat || !CalleeHasFeat)
-    return Diag.Report(CallLoc, diag::err_avx_calling_convention)
-           << IsArgument << Ty << Feature;
-
-  // Else, both caller and callee have the required feature, so there is no need
-  // to diagnose.
-  return false;
-}
-
-static bool checkAVXParam(DiagnosticsEngine &Diag, ASTContext &Ctx,
-                          SourceLocation CallLoc,
-                          const llvm::StringMap<bool> &CallerMap,
-                          const llvm::StringMap<bool> &CalleeMap, QualType Ty,
-                          bool IsArgument) {
-  uint64_t Size = Ctx.getTypeSize(Ty);
-  if (Size > 256)
-    return checkAVXParamFeature(Diag, CallLoc, CallerMap, CalleeMap, Ty,
-                                "avx512f", IsArgument);
-
-  if (Size > 128)
-    return checkAVXParamFeature(Diag, CallLoc, CallerMap, CalleeMap, Ty, "avx",
-                                IsArgument);
-
-  return false;
-}
-
-void X86_64TargetCodeGenInfo::checkFunctionCallABI(
-    CodeGenModule &CGM, SourceLocation CallLoc, const FunctionDecl *Caller,
-    const FunctionDecl *Callee, const CallArgList &Args) const {
-  llvm::StringMap<bool> CallerMap;
-  llvm::StringMap<bool> CalleeMap;
-  unsigned ArgIndex = 0;
-
-  // We need to loop through the actual call arguments rather than the
-  // function's parameters, in case this variadic.
-  for (const CallArg &Arg : Args) {
-    // The "avx" feature changes how vectors >128 in size are passed. "avx512f"
-    // additionally changes how vectors >256 in size are passed. Like GCC, we
-    // warn when a function is called with an argument where this will change.
-    // Unlike GCC, we also error when it is an obvious ABI mismatch, that is,
-    // the caller and callee features are mismatched.
-    // Unfortunately, we cannot do this diagnostic in SEMA, since the callee can
-    // change its ABI with attribute-target after this call.
-    if (Arg.getType()->isVectorType() &&
-        CGM.getContext().getTypeSize(Arg.getType()) > 128) {
-      initFeatureMaps(CGM.getContext(), CallerMap, Caller, CalleeMap, Callee);
-      QualType Ty = Arg.getType();
-      // The CallArg seems to have desugared the type already, so for clearer
-      // diagnostics, replace it with the type in the FunctionDecl if possible.
-      if (ArgIndex < Callee->getNumParams())
-        Ty = Callee->getParamDecl(ArgIndex)->getType();
-
-      if (checkAVXParam(CGM.getDiags(), CGM.getContext(), CallLoc, CallerMap,
-                        CalleeMap, Ty, /*IsArgument*/ true))
-        return;
-    }
-    ++ArgIndex;
-  }
-
-  // Check return always, as we don't have a good way of knowing in codegen
-  // whether this value is used, tail-called, etc.
-  if (Callee->getReturnType()->isVectorType() &&
-      CGM.getContext().getTypeSize(Callee->getReturnType()) > 128) {
-    initFeatureMaps(CGM.getContext(), CallerMap, Caller, CalleeMap, Callee);
-    checkAVXParam(CGM.getDiags(), CGM.getContext(), CallLoc, CallerMap,
-                  CalleeMap, Callee->getReturnType(),
-                  /*IsArgument*/ false);
-  }
-}
-
-static std::string qualifyWindowsLibrary(llvm::StringRef Lib) {
-  // If the argument does not end in .lib, automatically add the suffix.
-  // If the argument contains a space, enclose it in quotes.
-  // This matches the behavior of MSVC.
-  bool Quote = Lib.contains(' ');
-  std::string ArgStr = Quote ? "\"" : "";
-  ArgStr += Lib;
-  if (!Lib.endswith_insensitive(".lib") && !Lib.endswith_insensitive(".a"))
-    ArgStr += ".lib";
-  ArgStr += Quote ? "\"" : "";
-  return ArgStr;
-}
-
-class WinX86_32TargetCodeGenInfo : public X86_32TargetCodeGenInfo {
-public:
-  WinX86_32TargetCodeGenInfo(CodeGen::CodeGenTypes &CGT,
-        bool DarwinVectorABI, bool RetSmallStructInRegABI, bool Win32StructABI,
-        unsigned NumRegisterParameters)
-    : X86_32TargetCodeGenInfo(CGT, DarwinVectorABI, RetSmallStructInRegABI,
-        Win32StructABI, NumRegisterParameters, false) {}
-
-  void setTargetAttributes(const Decl *D, llvm::GlobalValue *GV,
-                           CodeGen::CodeGenModule &CGM) const override;
-
-  void getDependentLibraryOption(llvm::StringRef Lib,
-                                 llvm::SmallString<24> &Opt) const override {
-    Opt = "/DEFAULTLIB:";
-    Opt += qualifyWindowsLibrary(Lib);
-  }
-
-  void getDetectMismatchOption(llvm::StringRef Name,
-                               llvm::StringRef Value,
-                               llvm::SmallString<32> &Opt) const override {
-    Opt = "/FAILIFMISMATCH:\"" + Name.str() + "=" + Value.str() + "\"";
-  }
-};
-
-static void addStackProbeTargetAttributes(const Decl *D, llvm::GlobalValue *GV,
-                                          CodeGen::CodeGenModule &CGM) {
-  if (llvm::Function *Fn = dyn_cast_or_null<llvm::Function>(GV)) {
-
-    if (CGM.getCodeGenOpts().StackProbeSize != 4096)
-      Fn->addFnAttr("stack-probe-size",
-                    llvm::utostr(CGM.getCodeGenOpts().StackProbeSize));
-    if (CGM.getCodeGenOpts().NoStackArgProbe)
-      Fn->addFnAttr("no-stack-arg-probe");
-  }
-}
-
-void WinX86_32TargetCodeGenInfo::setTargetAttributes(
-    const Decl *D, llvm::GlobalValue *GV, CodeGen::CodeGenModule &CGM) const {
-  X86_32TargetCodeGenInfo::setTargetAttributes(D, GV, CGM);
-  if (GV->isDeclaration())
-    return;
-  addStackProbeTargetAttributes(D, GV, CGM);
-}
-
-class WinX86_64TargetCodeGenInfo : public TargetCodeGenInfo {
-public:
-  WinX86_64TargetCodeGenInfo(CodeGen::CodeGenTypes &CGT,
-                             X86AVXABILevel AVXLevel)
-      : TargetCodeGenInfo(std::make_unique<WinX86_64ABIInfo>(CGT, AVXLevel)) {
-    SwiftInfo =
-        std::make_unique<SwiftABIInfo>(CGT, /*SwiftErrorInRegister=*/true);
-  }
-
-  void setTargetAttributes(const Decl *D, llvm::GlobalValue *GV,
-                           CodeGen::CodeGenModule &CGM) const override;
-
-  int getDwarfEHStackPointer(CodeGen::CodeGenModule &CGM) const override {
-    return 7;
-  }
-
-  bool initDwarfEHRegSizeTable(CodeGen::CodeGenFunction &CGF,
-                               llvm::Value *Address) const override {
-    llvm::Value *Eight8 = llvm::ConstantInt::get(CGF.Int8Ty, 8);
-
-    // 0-15 are the 16 integer registers.
-    // 16 is %rip.
-    AssignToArrayRange(CGF.Builder, Address, Eight8, 0, 16);
-    return false;
-  }
-
-  void getDependentLibraryOption(llvm::StringRef Lib,
-                                 llvm::SmallString<24> &Opt) const override {
-    Opt = "/DEFAULTLIB:";
-    Opt += qualifyWindowsLibrary(Lib);
-  }
-
-  void getDetectMismatchOption(llvm::StringRef Name,
-                               llvm::StringRef Value,
-                               llvm::SmallString<32> &Opt) const override {
-    Opt = "/FAILIFMISMATCH:\"" + Name.str() + "=" + Value.str() + "\"";
-  }
-};
-
-void WinX86_64TargetCodeGenInfo::setTargetAttributes(
-    const Decl *D, llvm::GlobalValue *GV, CodeGen::CodeGenModule &CGM) const {
-  TargetCodeGenInfo::setTargetAttributes(D, GV, CGM);
-  if (GV->isDeclaration())
-    return;
-  if (const FunctionDecl *FD = dyn_cast_or_null<FunctionDecl>(D)) {
-    if (FD->hasAttr<X86ForceAlignArgPointerAttr>()) {
-      llvm::Function *Fn = cast<llvm::Function>(GV);
-      Fn->addFnAttr("stackrealign");
-    }
-
-    addX86InterruptAttrs(FD, GV, CGM);
-  }
-
-  addStackProbeTargetAttributes(D, GV, CGM);
-}
-}
-
-void X86_64ABIInfo::postMerge(unsigned AggregateSize, Class &Lo,
-                              Class &Hi) const {
-  // AMD64-ABI 3.2.3p2: Rule 5. Then a post merger cleanup is done:
-  //
-  // (a) If one of the classes is Memory, the whole argument is passed in
-  //     memory.
-  //
-  // (b) If X87UP is not preceded by X87, the whole argument is passed in
-  //     memory.
-  //
-  // (c) If the size of the aggregate exceeds two eightbytes and the first
-  //     eightbyte isn't SSE or any other eightbyte isn't SSEUP, the whole
-  //     argument is passed in memory. NOTE: This is necessary to keep the
-  //     ABI working for processors that don't support the __m256 type.
-  //
-  // (d) If SSEUP is not preceded by SSE or SSEUP, it is converted to SSE.
-  //
-  // Some of these are enforced by the merging logic.  Others can arise
-  // only with unions; for example:
-  //   union { _Complex double; unsigned; }
-  //
-  // Note that clauses (b) and (c) were added in 0.98.
-  //
-  if (Hi == Memory)
-    Lo = Memory;
-  if (Hi == X87Up && Lo != X87 && honorsRevision0_98())
-    Lo = Memory;
-  if (AggregateSize > 128 && (Lo != SSE || Hi != SSEUp))
-    Lo = Memory;
-  if (Hi == SSEUp && Lo != SSE)
-    Hi = SSE;
-}
-
-X86_64ABIInfo::Class X86_64ABIInfo::merge(Class Accum, Class Field) {
-  // AMD64-ABI 3.2.3p2: Rule 4. Each field of an object is
-  // classified recursively so that always two fields are
-  // considered. The resulting class is calculated according to
-  // the classes of the fields in the eightbyte:
-  //
-  // (a) If both classes are equal, this is the resulting class.
-  //
-  // (b) If one of the classes is NO_CLASS, the resulting class is
-  // the other class.
-  //
-  // (c) If one of the classes is MEMORY, the result is the MEMORY
-  // class.
-  //
-  // (d) If one of the classes is INTEGER, the result is the
-  // INTEGER.
-  //
-  // (e) If one of the classes is X87, X87UP, COMPLEX_X87 class,
-  // MEMORY is used as class.
-  //
-  // (f) Otherwise class SSE is used.
-
-  // Accum should never be memory (we should have returned) or
-  // ComplexX87 (because this cannot be passed in a structure).
-  assert((Accum != Memory && Accum != ComplexX87) &&
-         "Invalid accumulated classification during merge.");
-  if (Accum == Field || Field == NoClass)
-    return Accum;
-  if (Field == Memory)
-    return Memory;
-  if (Accum == NoClass)
-    return Field;
-  if (Accum == Integer || Field == Integer)
-    return Integer;
-  if (Field == X87 || Field == X87Up || Field == ComplexX87 ||
-      Accum == X87 || Accum == X87Up)
-    return Memory;
-  return SSE;
-}
-
-void X86_64ABIInfo::classify(QualType Ty, uint64_t OffsetBase, Class &Lo,
-                             Class &Hi, bool isNamedArg, bool IsRegCall) const {
-  // FIXME: This code can be simplified by introducing a simple value class for
-  // Class pairs with appropriate constructor methods for the various
-  // situations.
-
-  // FIXME: Some of the split computations are wrong; unaligned vectors
-  // shouldn't be passed in registers for example, so there is no chance they
-  // can straddle an eightbyte. Verify & simplify.
-
-  Lo = Hi = NoClass;
-
-  Class &Current = OffsetBase < 64 ? Lo : Hi;
-  Current = Memory;
-
-  if (const BuiltinType *BT = Ty->getAs<BuiltinType>()) {
-    BuiltinType::Kind k = BT->getKind();
-
-    if (k == BuiltinType::Void) {
-      Current = NoClass;
-    } else if (k == BuiltinType::Int128 || k == BuiltinType::UInt128) {
-      Lo = Integer;
-      Hi = Integer;
-    } else if (k >= BuiltinType::Bool && k <= BuiltinType::LongLong) {
-      Current = Integer;
-    } else if (k == BuiltinType::Float || k == BuiltinType::Double ||
-               k == BuiltinType::Float16 || k == BuiltinType::BFloat16) {
-      Current = SSE;
-    } else if (k == BuiltinType::LongDouble) {
-      const llvm::fltSemantics *LDF = &getTarget().getLongDoubleFormat();
-      if (LDF == &llvm::APFloat::IEEEquad()) {
-        Lo = SSE;
-        Hi = SSEUp;
-      } else if (LDF == &llvm::APFloat::x87DoubleExtended()) {
-        Lo = X87;
-        Hi = X87Up;
-      } else if (LDF == &llvm::APFloat::IEEEdouble()) {
-        Current = SSE;
-      } else
-        llvm_unreachable("unexpected long double representation!");
-    }
-    // FIXME: _Decimal32 and _Decimal64 are SSE.
-    // FIXME: _float128 and _Decimal128 are (SSE, SSEUp).
-    return;
-  }
-
-  if (const EnumType *ET = Ty->getAs<EnumType>()) {
-    // Classify the underlying integer type.
-    classify(ET->getDecl()->getIntegerType(), OffsetBase, Lo, Hi, isNamedArg);
-    return;
-  }
-
-  if (Ty->hasPointerRepresentation()) {
-    Current = Integer;
-    return;
-  }
-
-  if (Ty->isMemberPointerType()) {
-    if (Ty->isMemberFunctionPointerType()) {
-      if (Has64BitPointers) {
-        // If Has64BitPointers, this is an {i64, i64}, so classify both
-        // Lo and Hi now.
-        Lo = Hi = Integer;
-      } else {
-        // Otherwise, with 32-bit pointers, this is an {i32, i32}. If that
-        // straddles an eightbyte boundary, Hi should be classified as well.
-        uint64_t EB_FuncPtr = (OffsetBase) / 64;
-        uint64_t EB_ThisAdj = (OffsetBase + 64 - 1) / 64;
-        if (EB_FuncPtr != EB_ThisAdj) {
-          Lo = Hi = Integer;
-        } else {
-          Current = Integer;
-        }
-      }
-    } else {
-      Current = Integer;
-    }
-    return;
-  }
-
-  if (const VectorType *VT = Ty->getAs<VectorType>()) {
-    uint64_t Size = getContext().getTypeSize(VT);
-    if (Size == 1 || Size == 8 || Size == 16 || Size == 32) {
-      // gcc passes the following as integer:
-      // 4 bytes - <4 x char>, <2 x short>, <1 x int>, <1 x float>
-      // 2 bytes - <2 x char>, <1 x short>
-      // 1 byte  - <1 x char>
-      Current = Integer;
-
-      // If this type crosses an eightbyte boundary, it should be
-      // split.
-      uint64_t EB_Lo = (OffsetBase) / 64;
-      uint64_t EB_Hi = (OffsetBase + Size - 1) / 64;
-      if (EB_Lo != EB_Hi)
-        Hi = Lo;
-    } else if (Size == 64) {
-      QualType ElementType = VT->getElementType();
-
-      // gcc passes <1 x double> in memory. :(
-      if (ElementType->isSpecificBuiltinType(BuiltinType::Double))
-        return;
-
-      // gcc passes <1 x long long> as SSE but clang used to unconditionally
-      // pass them as integer.  For platforms where clang is the de facto
-      // platform compiler, we must continue to use integer.
-      if (!classifyIntegerMMXAsSSE() &&
-          (ElementType->isSpecificBuiltinType(BuiltinType::LongLong) ||
-           ElementType->isSpecificBuiltinType(BuiltinType::ULongLong) ||
-           ElementType->isSpecificBuiltinType(BuiltinType::Long) ||
-           ElementType->isSpecificBuiltinType(BuiltinType::ULong)))
-        Current = Integer;
-      else
-        Current = SSE;
-
-      // If this type crosses an eightbyte boundary, it should be
-      // split.
-      if (OffsetBase && OffsetBase != 64)
-        Hi = Lo;
-    } else if (Size == 128 ||
-               (isNamedArg && Size <= getNativeVectorSizeForAVXABI(AVXLevel))) {
-      QualType ElementType = VT->getElementType();
-
-      // gcc passes 256 and 512 bit <X x __int128> vectors in memory. :(
-      if (passInt128VectorsInMem() && Size != 128 &&
-          (ElementType->isSpecificBuiltinType(BuiltinType::Int128) ||
-           ElementType->isSpecificBuiltinType(BuiltinType::UInt128)))
-        return;
-
-      // Arguments of 256-bits are split into four eightbyte chunks. The
-      // least significant one belongs to class SSE and all the others to class
-      // SSEUP. The original Lo and Hi design considers that types can't be
-      // greater than 128-bits, so a 64-bit split in Hi and Lo makes sense.
-      // This design isn't correct for 256-bits, but since there're no cases
-      // where the upper parts would need to be inspected, avoid adding
-      // complexity and just consider Hi to match the 64-256 part.
-      //
-      // Note that per 3.5.7 of AMD64-ABI, 256-bit args are only passed in
-      // registers if they are "named", i.e. not part of the "..." of a
-      // variadic function.
-      //
-      // Similarly, per 3.2.3. of the AVX512 draft, 512-bits ("named") args are
-      // split into eight eightbyte chunks, one SSE and seven SSEUP.
-      Lo = SSE;
-      Hi = SSEUp;
-    }
-    return;
-  }
-
-  if (const ComplexType *CT = Ty->getAs<ComplexType>()) {
-    QualType ET = getContext().getCanonicalType(CT->getElementType());
-
-    uint64_t Size = getContext().getTypeSize(Ty);
-    if (ET->isIntegralOrEnumerationType()) {
-      if (Size <= 64)
-        Current = Integer;
-      else if (Size <= 128)
-        Lo = Hi = Integer;
-    } else if (ET->isFloat16Type() || ET == getContext().FloatTy ||
-               ET->isBFloat16Type()) {
-      Current = SSE;
-    } else if (ET == getContext().DoubleTy) {
-      Lo = Hi = SSE;
-    } else if (ET == getContext().LongDoubleTy) {
-      const llvm::fltSemantics *LDF = &getTarget().getLongDoubleFormat();
-      if (LDF == &llvm::APFloat::IEEEquad())
-        Current = Memory;
-      else if (LDF == &llvm::APFloat::x87DoubleExtended())
-        Current = ComplexX87;
-      else if (LDF == &llvm::APFloat::IEEEdouble())
-        Lo = Hi = SSE;
-      else
-        llvm_unreachable("unexpected long double representation!");
-    }
-
-    // If this complex type crosses an eightbyte boundary then it
-    // should be split.
-    uint64_t EB_Real = (OffsetBase) / 64;
-    uint64_t EB_Imag = (OffsetBase + getContext().getTypeSize(ET)) / 64;
-    if (Hi == NoClass && EB_Real != EB_Imag)
-      Hi = Lo;
-
-    return;
-  }
-
-  if (const auto *EITy = Ty->getAs<BitIntType>()) {
-    if (EITy->getNumBits() <= 64)
-      Current = Integer;
-    else if (EITy->getNumBits() <= 128)
-      Lo = Hi = Integer;
-    // Larger values need to get passed in memory.
-    return;
-  }
-
-  if (const ConstantArrayType *AT = getContext().getAsConstantArrayType(Ty)) {
-    // Arrays are treated like structures.
-
-    uint64_t Size = getContext().getTypeSize(Ty);
-
-    // AMD64-ABI 3.2.3p2: Rule 1. If the size of an object is larger
-    // than eight eightbytes, ..., it has class MEMORY.
-    // regcall ABI doesn't have limitation to an object. The only limitation
-    // is the free registers, which will be checked in computeInfo.
-    if (!IsRegCall && Size > 512)
-      return;
-
-    // AMD64-ABI 3.2.3p2: Rule 1. If ..., or it contains unaligned
-    // fields, it has class MEMORY.
-    //
-    // Only need to check alignment of array base.
-    if (OffsetBase % getContext().getTypeAlign(AT->getElementType()))
-      return;
-
-    // Otherwise implement simplified merge. We could be smarter about
-    // this, but it isn't worth it and would be harder to verify.
-    Current = NoClass;
-    uint64_t EltSize = getContext().getTypeSize(AT->getElementType());
-    uint64_t ArraySize = AT->getSize().getZExtValue();
-
-    // The only case a 256-bit wide vector could be used is when the array
-    // contains a single 256-bit element. Since Lo and Hi logic isn't extended
-    // to work for sizes wider than 128, early check and fallback to memory.
-    //
-    if (Size > 128 &&
-        (Size != EltSize || Size > getNativeVectorSizeForAVXABI(AVXLevel)))
-      return;
-
-    for (uint64_t i=0, Offset=OffsetBase; i<ArraySize; ++i, Offset += EltSize) {
-      Class FieldLo, FieldHi;
-      classify(AT->getElementType(), Offset, FieldLo, FieldHi, isNamedArg);
-      Lo = merge(Lo, FieldLo);
-      Hi = merge(Hi, FieldHi);
-      if (Lo == Memory || Hi == Memory)
-        break;
-    }
-
-    postMerge(Size, Lo, Hi);
-    assert((Hi != SSEUp || Lo == SSE) && "Invalid SSEUp array classification.");
-    return;
-  }
-
-  if (const RecordType *RT = Ty->getAs<RecordType>()) {
-    uint64_t Size = getContext().getTypeSize(Ty);
-
-    // AMD64-ABI 3.2.3p2: Rule 1. If the size of an object is larger
-    // than eight eightbytes, ..., it has class MEMORY.
-    if (Size > 512)
-      return;
-
-    // AMD64-ABI 3.2.3p2: Rule 2. If a C++ object has either a non-trivial
-    // copy constructor or a non-trivial destructor, it is passed by invisible
-    // reference.
-    if (getRecordArgABI(RT, getCXXABI()))
-      return;
-
-    const RecordDecl *RD = RT->getDecl();
-
-    // Assume variable sized types are passed in memory.
-    if (RD->hasFlexibleArrayMember())
-      return;
-
-    const ASTRecordLayout &Layout = getContext().getASTRecordLayout(RD);
-
-    // Reset Lo class, this will be recomputed.
-    Current = NoClass;
-
-    // If this is a C++ record, classify the bases first.
-    if (const CXXRecordDecl *CXXRD = dyn_cast<CXXRecordDecl>(RD)) {
-      for (const auto &I : CXXRD->bases()) {
-        assert(!I.isVirtual() && !I.getType()->isDependentType() &&
-               "Unexpected base class!");
-        const auto *Base =
-            cast<CXXRecordDecl>(I.getType()->castAs<RecordType>()->getDecl());
-
-        // Classify this field.
-        //
-        // AMD64-ABI 3.2.3p2: Rule 3. If the size of the aggregate exceeds a
-        // single eightbyte, each is classified separately. Each eightbyte gets
-        // initialized to class NO_CLASS.
-        Class FieldLo, FieldHi;
-        uint64_t Offset =
-          OffsetBase + getContext().toBits(Layout.getBaseClassOffset(Base));
-        classify(I.getType(), Offset, FieldLo, FieldHi, isNamedArg);
-        Lo = merge(Lo, FieldLo);
-        Hi = merge(Hi, FieldHi);
-        if (Lo == Memory || Hi == Memory) {
-          postMerge(Size, Lo, Hi);
-          return;
-        }
-      }
-    }
-
-    // Classify the fields one at a time, merging the results.
-    unsigned idx = 0;
-    bool UseClang11Compat = getContext().getLangOpts().getClangABICompat() <=
-                                LangOptions::ClangABI::Ver11 ||
-                            getContext().getTargetInfo().getTriple().isPS();
-    bool IsUnion = RT->isUnionType() && !UseClang11Compat;
-
-    for (RecordDecl::field_iterator i = RD->field_begin(), e = RD->field_end();
-           i != e; ++i, ++idx) {
-      uint64_t Offset = OffsetBase + Layout.getFieldOffset(idx);
-      bool BitField = i->isBitField();
-
-      // Ignore padding bit-fields.
-      if (BitField && i->isUnnamedBitfield())
-        continue;
-
-      // AMD64-ABI 3.2.3p2: Rule 1. If the size of an object is larger than
-      // eight eightbytes, or it contains unaligned fields, it has class MEMORY.
-      //
-      // The only case a 256-bit or a 512-bit wide vector could be used is when
-      // the struct contains a single 256-bit or 512-bit element. Early check
-      // and fallback to memory.
-      //
-      // FIXME: Extended the Lo and Hi logic properly to work for size wider
-      // than 128.
-      if (Size > 128 &&
-          ((!IsUnion && Size != getContext().getTypeSize(i->getType())) ||
-           Size > getNativeVectorSizeForAVXABI(AVXLevel))) {
-        Lo = Memory;
-        postMerge(Size, Lo, Hi);
-        return;
-      }
-      // Note, skip this test for bit-fields, see below.
-      if (!BitField && Offset % getContext().getTypeAlign(i->getType())) {
-        Lo = Memory;
-        postMerge(Size, Lo, Hi);
-        return;
-      }
-
-      // Classify this field.
-      //
-      // AMD64-ABI 3.2.3p2: Rule 3. If the size of the aggregate
-      // exceeds a single eightbyte, each is classified
-      // separately. Each eightbyte gets initialized to class
-      // NO_CLASS.
-      Class FieldLo, FieldHi;
-
-      // Bit-fields require special handling, they do not force the
-      // structure to be passed in memory even if unaligned, and
-      // therefore they can straddle an eightbyte.
-      if (BitField) {
-        assert(!i->isUnnamedBitfield());
-        uint64_t Offset = OffsetBase + Layout.getFieldOffset(idx);
-        uint64_t Size = i->getBitWidthValue(getContext());
-
-        uint64_t EB_Lo = Offset / 64;
-        uint64_t EB_Hi = (Offset + Size - 1) / 64;
-
-        if (EB_Lo) {
-          assert(EB_Hi == EB_Lo && "Invalid classification, type > 16 bytes.");
-          FieldLo = NoClass;
-          FieldHi = Integer;
-        } else {
-          FieldLo = Integer;
-          FieldHi = EB_Hi ? Integer : NoClass;
-        }
-      } else
-        classify(i->getType(), Offset, FieldLo, FieldHi, isNamedArg);
-      Lo = merge(Lo, FieldLo);
-      Hi = merge(Hi, FieldHi);
-      if (Lo == Memory || Hi == Memory)
-        break;
-    }
-
-    postMerge(Size, Lo, Hi);
-  }
-}
-
-ABIArgInfo X86_64ABIInfo::getIndirectReturnResult(QualType Ty) const {
-  // If this is a scalar LLVM value then assume LLVM will pass it in the right
-  // place naturally.
-  if (!isAggregateTypeForABI(Ty)) {
-    // Treat an enum type as its underlying type.
-    if (const EnumType *EnumTy = Ty->getAs<EnumType>())
-      Ty = EnumTy->getDecl()->getIntegerType();
-
-    if (Ty->isBitIntType())
-      return getNaturalAlignIndirect(Ty);
-
-    return (isPromotableIntegerTypeForABI(Ty) ? ABIArgInfo::getExtend(Ty)
-                                              : ABIArgInfo::getDirect());
-  }
-
-  return getNaturalAlignIndirect(Ty);
-}
-
-bool X86_64ABIInfo::IsIllegalVectorType(QualType Ty) const {
-  if (const VectorType *VecTy = Ty->getAs<VectorType>()) {
-    uint64_t Size = getContext().getTypeSize(VecTy);
-    unsigned LargestVector = getNativeVectorSizeForAVXABI(AVXLevel);
-    if (Size <= 64 || Size > LargestVector)
-      return true;
-    QualType EltTy = VecTy->getElementType();
-    if (passInt128VectorsInMem() &&
-        (EltTy->isSpecificBuiltinType(BuiltinType::Int128) ||
-         EltTy->isSpecificBuiltinType(BuiltinType::UInt128)))
-      return true;
-  }
-
-  return false;
-}
-
-ABIArgInfo X86_64ABIInfo::getIndirectResult(QualType Ty,
-                                            unsigned freeIntRegs) const {
-  // If this is a scalar LLVM value then assume LLVM will pass it in the right
-  // place naturally.
-  //
-  // This assumption is optimistic, as there could be free registers available
-  // when we need to pass this argument in memory, and LLVM could try to pass
-  // the argument in the free register. This does not seem to happen currently,
-  // but this code would be much safer if we could mark the argument with
-  // 'onstack'. See PR12193.
-  if (!isAggregateTypeForABI(Ty) && !IsIllegalVectorType(Ty) &&
-      !Ty->isBitIntType()) {
-    // Treat an enum type as its underlying type.
-    if (const EnumType *EnumTy = Ty->getAs<EnumType>())
-      Ty = EnumTy->getDecl()->getIntegerType();
-
-    return (isPromotableIntegerTypeForABI(Ty) ? ABIArgInfo::getExtend(Ty)
-                                              : ABIArgInfo::getDirect());
-  }
-
-  if (CGCXXABI::RecordArgABI RAA = getRecordArgABI(Ty, getCXXABI()))
-    return getNaturalAlignIndirect(Ty, RAA == CGCXXABI::RAA_DirectInMemory);
-
-  // Compute the byval alignment. We specify the alignment of the byval in all
-  // cases so that the mid-level optimizer knows the alignment of the byval.
-  unsigned Align = std::max(getContext().getTypeAlign(Ty) / 8, 8U);
-
-  // Attempt to avoid passing indirect results using byval when possible. This
-  // is important for good codegen.
-  //
-  // We do this by coercing the value into a scalar type which the backend can
-  // handle naturally (i.e., without using byval).
-  //
-  // For simplicity, we currently only do this when we have exhausted all of the
-  // free integer registers. Doing this when there are free integer registers
-  // would require more care, as we would have to ensure that the coerced value
-  // did not claim the unused register. That would require either reording the
-  // arguments to the function (so that any subsequent inreg values came first),
-  // or only doing this optimization when there were no following arguments that
-  // might be inreg.
-  //
-  // We currently expect it to be rare (particularly in well written code) for
-  // arguments to be passed on the stack when there are still free integer
-  // registers available (this would typically imply large structs being passed
-  // by value), so this seems like a fair tradeoff for now.
-  //
-  // We can revisit this if the backend grows support for 'onstack' parameter
-  // attributes. See PR12193.
-  if (freeIntRegs == 0) {
-    uint64_t Size = getContext().getTypeSize(Ty);
-
-    // If this type fits in an eightbyte, coerce it into the matching integral
-    // type, which will end up on the stack (with alignment 8).
-    if (Align == 8 && Size <= 64)
-      return ABIArgInfo::getDirect(llvm::IntegerType::get(getVMContext(),
-                                                          Size));
-  }
-
-  return ABIArgInfo::getIndirect(CharUnits::fromQuantity(Align));
-}
-
-/// The ABI specifies that a value should be passed in a full vector XMM/YMM
-/// register. Pick an LLVM IR type that will be passed as a vector register.
-llvm::Type *X86_64ABIInfo::GetByteVectorType(QualType Ty) const {
-  // Wrapper structs/arrays that only contain vectors are passed just like
-  // vectors; strip them off if present.
-  if (const Type *InnerTy = isSingleElementStruct(Ty, getContext()))
-    Ty = QualType(InnerTy, 0);
-
-  llvm::Type *IRType = CGT.ConvertType(Ty);
-  if (isa<llvm::VectorType>(IRType)) {
-    // Don't pass vXi128 vectors in their native type, the backend can't
-    // legalize them.
-    if (passInt128VectorsInMem() &&
-        cast<llvm::VectorType>(IRType)->getElementType()->isIntegerTy(128)) {
-      // Use a vXi64 vector.
-      uint64_t Size = getContext().getTypeSize(Ty);
-      return llvm::FixedVectorType::get(llvm::Type::getInt64Ty(getVMContext()),
-                                        Size / 64);
-    }
-
-    return IRType;
-  }
-
-  if (IRType->getTypeID() == llvm::Type::FP128TyID)
-    return IRType;
-
-  // We couldn't find the preferred IR vector type for 'Ty'.
-  uint64_t Size = getContext().getTypeSize(Ty);
-  assert((Size == 128 || Size == 256 || Size == 512) && "Invalid type found!");
-
-
-  // Return a LLVM IR vector type based on the size of 'Ty'.
-  return llvm::FixedVectorType::get(llvm::Type::getDoubleTy(getVMContext()),
-                                    Size / 64);
-}
-
-/// BitsContainNoUserData - Return true if the specified [start,end) bit range
-/// is known to either be off the end of the specified type or being in
-/// alignment padding.  The user type specified is known to be at most 128 bits
-/// in size, and have passed through X86_64ABIInfo::classify with a successful
-/// classification that put one of the two halves in the INTEGER class.
-///
-/// It is conservatively correct to return false.
-static bool BitsContainNoUserData(QualType Ty, unsigned StartBit,
-                                  unsigned EndBit, ASTContext &Context) {
-  // If the bytes being queried are off the end of the type, there is no user
-  // data hiding here.  This handles analysis of builtins, vectors and other
-  // types that don't contain interesting padding.
-  unsigned TySize = (unsigned)Context.getTypeSize(Ty);
-  if (TySize <= StartBit)
-    return true;
-
-  if (const ConstantArrayType *AT = Context.getAsConstantArrayType(Ty)) {
-    unsigned EltSize = (unsigned)Context.getTypeSize(AT->getElementType());
-    unsigned NumElts = (unsigned)AT->getSize().getZExtValue();
-
-    // Check each element to see if the element overlaps with the queried range.
-    for (unsigned i = 0; i != NumElts; ++i) {
-      // If the element is after the span we care about, then we're done..
-      unsigned EltOffset = i*EltSize;
-      if (EltOffset >= EndBit) break;
-
-      unsigned EltStart = EltOffset < StartBit ? StartBit-EltOffset :0;
-      if (!BitsContainNoUserData(AT->getElementType(), EltStart,
-                                 EndBit-EltOffset, Context))
-        return false;
-    }
-    // If it overlaps no elements, then it is safe to process as padding.
-    return true;
-  }
-
-  if (const RecordType *RT = Ty->getAs<RecordType>()) {
-    const RecordDecl *RD = RT->getDecl();
-    const ASTRecordLayout &Layout = Context.getASTRecordLayout(RD);
-
-    // If this is a C++ record, check the bases first.
-    if (const CXXRecordDecl *CXXRD = dyn_cast<CXXRecordDecl>(RD)) {
-      for (const auto &I : CXXRD->bases()) {
-        assert(!I.isVirtual() && !I.getType()->isDependentType() &&
-               "Unexpected base class!");
-        const auto *Base =
-            cast<CXXRecordDecl>(I.getType()->castAs<RecordType>()->getDecl());
-
-        // If the base is after the span we care about, ignore it.
-        unsigned BaseOffset = Context.toBits(Layout.getBaseClassOffset(Base));
-        if (BaseOffset >= EndBit) continue;
-
-        unsigned BaseStart = BaseOffset < StartBit ? StartBit-BaseOffset :0;
-        if (!BitsContainNoUserData(I.getType(), BaseStart,
-                                   EndBit-BaseOffset, Context))
-          return false;
-      }
-    }
-
-    // Verify that no field has data that overlaps the region of interest.  Yes
-    // this could be sped up a lot by being smarter about queried fields,
-    // however we're only looking at structs up to 16 bytes, so we don't care
-    // much.
-    unsigned idx = 0;
-    for (RecordDecl::field_iterator i = RD->field_begin(), e = RD->field_end();
-         i != e; ++i, ++idx) {
-      unsigned FieldOffset = (unsigned)Layout.getFieldOffset(idx);
-
-      // If we found a field after the region we care about, then we're done.
-      if (FieldOffset >= EndBit) break;
-
-      unsigned FieldStart = FieldOffset < StartBit ? StartBit-FieldOffset :0;
-      if (!BitsContainNoUserData(i->getType(), FieldStart, EndBit-FieldOffset,
-                                 Context))
-        return false;
-    }
-
-    // If nothing in this record overlapped the area of interest, then we're
-    // clean.
-    return true;
-  }
-
-  return false;
-}
-
-/// getFPTypeAtOffset - Return a floating point type at the specified offset.
-static llvm::Type *getFPTypeAtOffset(llvm::Type *IRType, unsigned IROffset,
-                                     const llvm::DataLayout &TD) {
-  if (IROffset == 0 && IRType->isFloatingPointTy())
-    return IRType;
-
-  // If this is a struct, recurse into the field at the specified offset.
-  if (llvm::StructType *STy = dyn_cast<llvm::StructType>(IRType)) {
-    if (!STy->getNumContainedTypes())
-      return nullptr;
-
-    const llvm::StructLayout *SL = TD.getStructLayout(STy);
-    unsigned Elt = SL->getElementContainingOffset(IROffset);
-    IROffset -= SL->getElementOffset(Elt);
-    return getFPTypeAtOffset(STy->getElementType(Elt), IROffset, TD);
-  }
-
-  // If this is an array, recurse into the field at the specified offset.
-  if (llvm::ArrayType *ATy = dyn_cast<llvm::ArrayType>(IRType)) {
-    llvm::Type *EltTy = ATy->getElementType();
-    unsigned EltSize = TD.getTypeAllocSize(EltTy);
-    IROffset -= IROffset / EltSize * EltSize;
-    return getFPTypeAtOffset(EltTy, IROffset, TD);
-  }
-
-  return nullptr;
-}
-
-/// GetSSETypeAtOffset - Return a type that will be passed by the backend in the
-/// low 8 bytes of an XMM register, corresponding to the SSE class.
-llvm::Type *X86_64ABIInfo::
-GetSSETypeAtOffset(llvm::Type *IRType, unsigned IROffset,
-                   QualType SourceTy, unsigned SourceOffset) const {
-  const llvm::DataLayout &TD = getDataLayout();
-  unsigned SourceSize =
-      (unsigned)getContext().getTypeSize(SourceTy) / 8 - SourceOffset;
-  llvm::Type *T0 = getFPTypeAtOffset(IRType, IROffset, TD);
-  if (!T0 || T0->isDoubleTy())
-    return llvm::Type::getDoubleTy(getVMContext());
-
-  // Get the adjacent FP type.
-  llvm::Type *T1 = nullptr;
-  unsigned T0Size = TD.getTypeAllocSize(T0);
-  if (SourceSize > T0Size)
-      T1 = getFPTypeAtOffset(IRType, IROffset + T0Size, TD);
-  if (T1 == nullptr) {
-    // Check if IRType is a half/bfloat + float. float type will be in IROffset+4 due
-    // to its alignment.
-    if (T0->is16bitFPTy() && SourceSize > 4)
-      T1 = getFPTypeAtOffset(IRType, IROffset + 4, TD);
-    // If we can't get a second FP type, return a simple half or float.
-    // avx512fp16-abi.c:pr51813_2 shows it works to return float for
-    // {float, i8} too.
-    if (T1 == nullptr)
-      return T0;
-  }
-
-  if (T0->isFloatTy() && T1->isFloatTy())
-    return llvm::FixedVectorType::get(T0, 2);
-
-  if (T0->is16bitFPTy() && T1->is16bitFPTy()) {
-    llvm::Type *T2 = nullptr;
-    if (SourceSize > 4)
-      T2 = getFPTypeAtOffset(IRType, IROffset + 4, TD);
-    if (T2 == nullptr)
-      return llvm::FixedVectorType::get(T0, 2);
-    return llvm::FixedVectorType::get(T0, 4);
-  }
-
-  if (T0->is16bitFPTy() || T1->is16bitFPTy())
-    return llvm::FixedVectorType::get(llvm::Type::getHalfTy(getVMContext()), 4);
-
-  return llvm::Type::getDoubleTy(getVMContext());
-}
-
-
-/// GetINTEGERTypeAtOffset - The ABI specifies that a value should be passed in
-/// an 8-byte GPR.  This means that we either have a scalar or we are talking
-/// about the high or low part of an up-to-16-byte struct.  This routine picks
-/// the best LLVM IR type to represent this, which may be i64 or may be anything
-/// else that the backend will pass in a GPR that works better (e.g. i8, %foo*,
-/// etc).
-///
-/// PrefType is an LLVM IR type that corresponds to (part of) the IR type for
-/// the source type.  IROffset is an offset in bytes into the LLVM IR type that
-/// the 8-byte value references.  PrefType may be null.
-///
-/// SourceTy is the source-level type for the entire argument.  SourceOffset is
-/// an offset into this that we're processing (which is always either 0 or 8).
-///
-llvm::Type *X86_64ABIInfo::
-GetINTEGERTypeAtOffset(llvm::Type *IRType, unsigned IROffset,
-                       QualType SourceTy, unsigned SourceOffset) const {
-  // If we're dealing with an un-offset LLVM IR type, then it means that we're
-  // returning an 8-byte unit starting with it.  See if we can safely use it.
-  if (IROffset == 0) {
-    // Pointers and int64's always fill the 8-byte unit.
-    if ((isa<llvm::PointerType>(IRType) && Has64BitPointers) ||
-        IRType->isIntegerTy(64))
-      return IRType;
-
-    // If we have a 1/2/4-byte integer, we can use it only if the rest of the
-    // goodness in the source type is just tail padding.  This is allowed to
-    // kick in for struct {double,int} on the int, but not on
-    // struct{double,int,int} because we wouldn't return the second int.  We
-    // have to do this analysis on the source type because we can't depend on
-    // unions being lowered a specific way etc.
-    if (IRType->isIntegerTy(8) || IRType->isIntegerTy(16) ||
-        IRType->isIntegerTy(32) ||
-        (isa<llvm::PointerType>(IRType) && !Has64BitPointers)) {
-      unsigned BitWidth = isa<llvm::PointerType>(IRType) ? 32 :
-          cast<llvm::IntegerType>(IRType)->getBitWidth();
-
-      if (BitsContainNoUserData(SourceTy, SourceOffset*8+BitWidth,
-                                SourceOffset*8+64, getContext()))
-        return IRType;
-    }
-  }
-
-  if (llvm::StructType *STy = dyn_cast<llvm::StructType>(IRType)) {
-    // If this is a struct, recurse into the field at the specified offset.
-    const llvm::StructLayout *SL = getDataLayout().getStructLayout(STy);
-    if (IROffset < SL->getSizeInBytes()) {
-      unsigned FieldIdx = SL->getElementContainingOffset(IROffset);
-      IROffset -= SL->getElementOffset(FieldIdx);
-
-      return GetINTEGERTypeAtOffset(STy->getElementType(FieldIdx), IROffset,
-                                    SourceTy, SourceOffset);
-    }
-  }
-
-  if (llvm::ArrayType *ATy = dyn_cast<llvm::ArrayType>(IRType)) {
-    llvm::Type *EltTy = ATy->getElementType();
-    unsigned EltSize = getDataLayout().getTypeAllocSize(EltTy);
-    unsigned EltOffset = IROffset/EltSize*EltSize;
-    return GetINTEGERTypeAtOffset(EltTy, IROffset-EltOffset, SourceTy,
-                                  SourceOffset);
-  }
-
-  // Okay, we don't have any better idea of what to pass, so we pass this in an
-  // integer register that isn't too big to fit the rest of the struct.
-  unsigned TySizeInBytes =
-    (unsigned)getContext().getTypeSizeInChars(SourceTy).getQuantity();
-
-  assert(TySizeInBytes != SourceOffset && "Empty field?");
-
-  // It is always safe to classify this as an integer type up to i64 that
-  // isn't larger than the structure.
-  return llvm::IntegerType::get(getVMContext(),
-                                std::min(TySizeInBytes-SourceOffset, 8U)*8);
-}
-
-
-/// GetX86_64ByValArgumentPair - Given a high and low type that can ideally
-/// be used as elements of a two register pair to pass or return, return a
-/// first class aggregate to represent them.  For example, if the low part of
-/// a by-value argument should be passed as i32* and the high part as float,
-/// return {i32*, float}.
-static llvm::Type *
-GetX86_64ByValArgumentPair(llvm::Type *Lo, llvm::Type *Hi,
-                           const llvm::DataLayout &TD) {
-  // In order to correctly satisfy the ABI, we need to the high part to start
-  // at offset 8.  If the high and low parts we inferred are both 4-byte types
-  // (e.g. i32 and i32) then the resultant struct type ({i32,i32}) won't have
-  // the second element at offset 8.  Check for this:
-  unsigned LoSize = (unsigned)TD.getTypeAllocSize(Lo);
-  llvm::Align HiAlign = TD.getABITypeAlign(Hi);
-  unsigned HiStart = llvm::alignTo(LoSize, HiAlign);
-  assert(HiStart != 0 && HiStart <= 8 && "Invalid x86-64 argument pair!");
-
-  // To handle this, we have to increase the size of the low part so that the
-  // second element will start at an 8 byte offset.  We can't increase the size
-  // of the second element because it might make us access off the end of the
-  // struct.
-  if (HiStart != 8) {
-    // There are usually two sorts of types the ABI generation code can produce
-    // for the low part of a pair that aren't 8 bytes in size: half, float or
-    // i8/i16/i32.  This can also include pointers when they are 32-bit (X32 and
-    // NaCl).
-    // Promote these to a larger type.
-    if (Lo->isHalfTy() || Lo->isFloatTy())
-      Lo = llvm::Type::getDoubleTy(Lo->getContext());
-    else {
-      assert((Lo->isIntegerTy() || Lo->isPointerTy())
-             && "Invalid/unknown lo type");
-      Lo = llvm::Type::getInt64Ty(Lo->getContext());
-    }
-  }
-
-  llvm::StructType *Result = llvm::StructType::get(Lo, Hi);
-
-  // Verify that the second element is at an 8-byte offset.
-  assert(TD.getStructLayout(Result)->getElementOffset(1) == 8 &&
-         "Invalid x86-64 argument pair!");
-  return Result;
-}
-
-ABIArgInfo X86_64ABIInfo::
-classifyReturnType(QualType RetTy) const {
-  // AMD64-ABI 3.2.3p4: Rule 1. Classify the return type with the
-  // classification algorithm.
-  X86_64ABIInfo::Class Lo, Hi;
-  classify(RetTy, 0, Lo, Hi, /*isNamedArg*/ true);
-
-  // Check some invariants.
-  assert((Hi != Memory || Lo == Memory) && "Invalid memory classification.");
-  assert((Hi != SSEUp || Lo == SSE) && "Invalid SSEUp classification.");
-
-  llvm::Type *ResType = nullptr;
-  switch (Lo) {
-  case NoClass:
-    if (Hi == NoClass)
-      return ABIArgInfo::getIgnore();
-    // If the low part is just padding, it takes no register, leave ResType
-    // null.
-    assert((Hi == SSE || Hi == Integer || Hi == X87Up) &&
-           "Unknown missing lo part");
-    break;
-
-  case SSEUp:
-  case X87Up:
-    llvm_unreachable("Invalid classification for lo word.");
-
-    // AMD64-ABI 3.2.3p4: Rule 2. Types of class memory are returned via
-    // hidden argument.
-  case Memory:
-    return getIndirectReturnResult(RetTy);
-
-    // AMD64-ABI 3.2.3p4: Rule 3. If the class is INTEGER, the next
-    // available register of the sequence %rax, %rdx is used.
-  case Integer:
-    ResType = GetINTEGERTypeAtOffset(CGT.ConvertType(RetTy), 0, RetTy, 0);
-
-    // If we have a sign or zero extended integer, make sure to return Extend
-    // so that the parameter gets the right LLVM IR attributes.
-    if (Hi == NoClass && isa<llvm::IntegerType>(ResType)) {
-      // Treat an enum type as its underlying type.
-      if (const EnumType *EnumTy = RetTy->getAs<EnumType>())
-        RetTy = EnumTy->getDecl()->getIntegerType();
-
-      if (RetTy->isIntegralOrEnumerationType() &&
-          isPromotableIntegerTypeForABI(RetTy))
-        return ABIArgInfo::getExtend(RetTy);
-    }
-    break;
-
-    // AMD64-ABI 3.2.3p4: Rule 4. If the class is SSE, the next
-    // available SSE register of the sequence %xmm0, %xmm1 is used.
-  case SSE:
-    ResType = GetSSETypeAtOffset(CGT.ConvertType(RetTy), 0, RetTy, 0);
-    break;
-
-    // AMD64-ABI 3.2.3p4: Rule 6. If the class is X87, the value is
-    // returned on the X87 stack in %st0 as 80-bit x87 number.
-  case X87:
-    ResType = llvm::Type::getX86_FP80Ty(getVMContext());
-    break;
-
-    // AMD64-ABI 3.2.3p4: Rule 8. If the class is COMPLEX_X87, the real
-    // part of the value is returned in %st0 and the imaginary part in
-    // %st1.
-  case ComplexX87:
-    assert(Hi == ComplexX87 && "Unexpected ComplexX87 classification.");
-    ResType = llvm::StructType::get(llvm::Type::getX86_FP80Ty(getVMContext()),
-                                    llvm::Type::getX86_FP80Ty(getVMContext()));
-    break;
-  }
-
-  llvm::Type *HighPart = nullptr;
-  switch (Hi) {
-    // Memory was handled previously and X87 should
-    // never occur as a hi class.
-  case Memory:
-  case X87:
-    llvm_unreachable("Invalid classification for hi word.");
-
-  case ComplexX87: // Previously handled.
-  case NoClass:
-    break;
-
-  case Integer:
-    HighPart = GetINTEGERTypeAtOffset(CGT.ConvertType(RetTy), 8, RetTy, 8);
-    if (Lo == NoClass)  // Return HighPart at offset 8 in memory.
-      return ABIArgInfo::getDirect(HighPart, 8);
-    break;
-  case SSE:
-    HighPart = GetSSETypeAtOffset(CGT.ConvertType(RetTy), 8, RetTy, 8);
-    if (Lo == NoClass)  // Return HighPart at offset 8 in memory.
-      return ABIArgInfo::getDirect(HighPart, 8);
-    break;
-
-    // AMD64-ABI 3.2.3p4: Rule 5. If the class is SSEUP, the eightbyte
-    // is passed in the next available eightbyte chunk if the last used
-    // vector register.
-    //
-    // SSEUP should always be preceded by SSE, just widen.
-  case SSEUp:
-    assert(Lo == SSE && "Unexpected SSEUp classification.");
-    ResType = GetByteVectorType(RetTy);
-    break;
-
-    // AMD64-ABI 3.2.3p4: Rule 7. If the class is X87UP, the value is
-    // returned together with the previous X87 value in %st0.
-  case X87Up:
-    // If X87Up is preceded by X87, we don't need to do
-    // anything. However, in some cases with unions it may not be
-    // preceded by X87. In such situations we follow gcc and pass the
-    // extra bits in an SSE reg.
-    if (Lo != X87) {
-      HighPart = GetSSETypeAtOffset(CGT.ConvertType(RetTy), 8, RetTy, 8);
-      if (Lo == NoClass)  // Return HighPart at offset 8 in memory.
-        return ABIArgInfo::getDirect(HighPart, 8);
-    }
-    break;
-  }
-
-  // If a high part was specified, merge it together with the low part.  It is
-  // known to pass in the high eightbyte of the result.  We do this by forming a
-  // first class struct aggregate with the high and low part: {low, high}
-  if (HighPart)
-    ResType = GetX86_64ByValArgumentPair(ResType, HighPart, getDataLayout());
-
-  return ABIArgInfo::getDirect(ResType);
-}
-
-ABIArgInfo
-X86_64ABIInfo::classifyArgumentType(QualType Ty, unsigned freeIntRegs,
-                                    unsigned &neededInt, unsigned &neededSSE,
-                                    bool isNamedArg, bool IsRegCall) const {
-  Ty = useFirstFieldIfTransparentUnion(Ty);
-
-  X86_64ABIInfo::Class Lo, Hi;
-  classify(Ty, 0, Lo, Hi, isNamedArg, IsRegCall);
-
-  // Check some invariants.
-  // FIXME: Enforce these by construction.
-  assert((Hi != Memory || Lo == Memory) && "Invalid memory classification.");
-  assert((Hi != SSEUp || Lo == SSE) && "Invalid SSEUp classification.");
-
-  neededInt = 0;
-  neededSSE = 0;
-  llvm::Type *ResType = nullptr;
-  switch (Lo) {
-  case NoClass:
-    if (Hi == NoClass)
-      return ABIArgInfo::getIgnore();
-    // If the low part is just padding, it takes no register, leave ResType
-    // null.
-    assert((Hi == SSE || Hi == Integer || Hi == X87Up) &&
-           "Unknown missing lo part");
-    break;
-
-    // AMD64-ABI 3.2.3p3: Rule 1. If the class is MEMORY, pass the argument
-    // on the stack.
-  case Memory:
-
-    // AMD64-ABI 3.2.3p3: Rule 5. If the class is X87, X87UP or
-    // COMPLEX_X87, it is passed in memory.
-  case X87:
-  case ComplexX87:
-    if (getRecordArgABI(Ty, getCXXABI()) == CGCXXABI::RAA_Indirect)
-      ++neededInt;
-    return getIndirectResult(Ty, freeIntRegs);
-
-  case SSEUp:
-  case X87Up:
-    llvm_unreachable("Invalid classification for lo word.");
-
-    // AMD64-ABI 3.2.3p3: Rule 2. If the class is INTEGER, the next
-    // available register of the sequence %rdi, %rsi, %rdx, %rcx, %r8
-    // and %r9 is used.
-  case Integer:
-    ++neededInt;
-
-    // Pick an 8-byte type based on the preferred type.
-    ResType = GetINTEGERTypeAtOffset(CGT.ConvertType(Ty), 0, Ty, 0);
-
-    // If we have a sign or zero extended integer, make sure to return Extend
-    // so that the parameter gets the right LLVM IR attributes.
-    if (Hi == NoClass && isa<llvm::IntegerType>(ResType)) {
-      // Treat an enum type as its underlying type.
-      if (const EnumType *EnumTy = Ty->getAs<EnumType>())
-        Ty = EnumTy->getDecl()->getIntegerType();
-
-      if (Ty->isIntegralOrEnumerationType() &&
-          isPromotableIntegerTypeForABI(Ty))
-        return ABIArgInfo::getExtend(Ty);
-    }
-
-    break;
-
-    // AMD64-ABI 3.2.3p3: Rule 3. If the class is SSE, the next
-    // available SSE register is used, the registers are taken in the
-    // order from %xmm0 to %xmm7.
-  case SSE: {
-    llvm::Type *IRType = CGT.ConvertType(Ty);
-    ResType = GetSSETypeAtOffset(IRType, 0, Ty, 0);
-    ++neededSSE;
-    break;
-  }
-  }
-
-  llvm::Type *HighPart = nullptr;
-  switch (Hi) {
-    // Memory was handled previously, ComplexX87 and X87 should
-    // never occur as hi classes, and X87Up must be preceded by X87,
-    // which is passed in memory.
-  case Memory:
-  case X87:
-  case ComplexX87:
-    llvm_unreachable("Invalid classification for hi word.");
-
-  case NoClass: break;
-
-  case Integer:
-    ++neededInt;
-    // Pick an 8-byte type based on the preferred type.
-    HighPart = GetINTEGERTypeAtOffset(CGT.ConvertType(Ty), 8, Ty, 8);
-
-    if (Lo == NoClass)  // Pass HighPart at offset 8 in memory.
-      return ABIArgInfo::getDirect(HighPart, 8);
-    break;
-
-    // X87Up generally doesn't occur here (long double is passed in
-    // memory), except in situations involving unions.
-  case X87Up:
-  case SSE:
-    HighPart = GetSSETypeAtOffset(CGT.ConvertType(Ty), 8, Ty, 8);
-
-    if (Lo == NoClass)  // Pass HighPart at offset 8 in memory.
-      return ABIArgInfo::getDirect(HighPart, 8);
-
-    ++neededSSE;
-    break;
-
-    // AMD64-ABI 3.2.3p3: Rule 4. If the class is SSEUP, the
-    // eightbyte is passed in the upper half of the last used SSE
-    // register.  This only happens when 128-bit vectors are passed.
-  case SSEUp:
-    assert(Lo == SSE && "Unexpected SSEUp classification");
-    ResType = GetByteVectorType(Ty);
-    break;
-  }
-
-  // If a high part was specified, merge it together with the low part.  It is
-  // known to pass in the high eightbyte of the result.  We do this by forming a
-  // first class struct aggregate with the high and low part: {low, high}
-  if (HighPart)
-    ResType = GetX86_64ByValArgumentPair(ResType, HighPart, getDataLayout());
-
-  return ABIArgInfo::getDirect(ResType);
-}
-
-ABIArgInfo
-X86_64ABIInfo::classifyRegCallStructTypeImpl(QualType Ty, unsigned &NeededInt,
-                                             unsigned &NeededSSE,
-                                             unsigned &MaxVectorWidth) const {
-  auto RT = Ty->getAs<RecordType>();
-  assert(RT && "classifyRegCallStructType only valid with struct types");
-
-  if (RT->getDecl()->hasFlexibleArrayMember())
-    return getIndirectReturnResult(Ty);
-
-  // Sum up bases
-  if (auto CXXRD = dyn_cast<CXXRecordDecl>(RT->getDecl())) {
-    if (CXXRD->isDynamicClass()) {
-      NeededInt = NeededSSE = 0;
-      return getIndirectReturnResult(Ty);
-    }
-
-    for (const auto &I : CXXRD->bases())
-      if (classifyRegCallStructTypeImpl(I.getType(), NeededInt, NeededSSE,
-                                        MaxVectorWidth)
-              .isIndirect()) {
-        NeededInt = NeededSSE = 0;
-        return getIndirectReturnResult(Ty);
-      }
-  }
-
-  // Sum up members
-  for (const auto *FD : RT->getDecl()->fields()) {
-    QualType MTy = FD->getType();
-    if (MTy->isRecordType() && !MTy->isUnionType()) {
-      if (classifyRegCallStructTypeImpl(MTy, NeededInt, NeededSSE,
-                                        MaxVectorWidth)
-              .isIndirect()) {
-        NeededInt = NeededSSE = 0;
-        return getIndirectReturnResult(Ty);
-      }
-    } else {
-      unsigned LocalNeededInt, LocalNeededSSE;
-      if (classifyArgumentType(MTy, UINT_MAX, LocalNeededInt, LocalNeededSSE,
-                               true, true)
-              .isIndirect()) {
-        NeededInt = NeededSSE = 0;
-        return getIndirectReturnResult(Ty);
-      }
-      if (const auto *AT = getContext().getAsConstantArrayType(MTy))
-        MTy = AT->getElementType();
-      if (const auto *VT = MTy->getAs<VectorType>())
-        if (getContext().getTypeSize(VT) > MaxVectorWidth)
-          MaxVectorWidth = getContext().getTypeSize(VT);
-      NeededInt += LocalNeededInt;
-      NeededSSE += LocalNeededSSE;
-    }
-  }
-
-  return ABIArgInfo::getDirect();
-}
-
-ABIArgInfo
-X86_64ABIInfo::classifyRegCallStructType(QualType Ty, unsigned &NeededInt,
-                                         unsigned &NeededSSE,
-                                         unsigned &MaxVectorWidth) const {
-
-  NeededInt = 0;
-  NeededSSE = 0;
-  MaxVectorWidth = 0;
-
-  return classifyRegCallStructTypeImpl(Ty, NeededInt, NeededSSE,
-                                       MaxVectorWidth);
-}
-
-void X86_64ABIInfo::computeInfo(CGFunctionInfo &FI) const {
-
-  const unsigned CallingConv = FI.getCallingConvention();
-  // It is possible to force Win64 calling convention on any x86_64 target by
-  // using __attribute__((ms_abi)). In such case to correctly emit Win64
-  // compatible code delegate this call to WinX86_64ABIInfo::computeInfo.
-  if (CallingConv == llvm::CallingConv::Win64) {
-    WinX86_64ABIInfo Win64ABIInfo(CGT, AVXLevel);
-    Win64ABIInfo.computeInfo(FI);
-    return;
-  }
-
-  bool IsRegCall = CallingConv == llvm::CallingConv::X86_RegCall;
-
-  // Keep track of the number of assigned registers.
-  unsigned FreeIntRegs = IsRegCall ? 11 : 6;
-  unsigned FreeSSERegs = IsRegCall ? 16 : 8;
-  unsigned NeededInt = 0, NeededSSE = 0, MaxVectorWidth = 0;
-
-  if (!::classifyReturnType(getCXXABI(), FI, *this)) {
-    if (IsRegCall && FI.getReturnType()->getTypePtr()->isRecordType() &&
-        !FI.getReturnType()->getTypePtr()->isUnionType()) {
-      FI.getReturnInfo() = classifyRegCallStructType(
-          FI.getReturnType(), NeededInt, NeededSSE, MaxVectorWidth);
-      if (FreeIntRegs >= NeededInt && FreeSSERegs >= NeededSSE) {
-        FreeIntRegs -= NeededInt;
-        FreeSSERegs -= NeededSSE;
-      } else {
-        FI.getReturnInfo() = getIndirectReturnResult(FI.getReturnType());
-      }
-    } else if (IsRegCall && FI.getReturnType()->getAs<ComplexType>() &&
-               getContext().getCanonicalType(FI.getReturnType()
-                                                 ->getAs<ComplexType>()
-                                                 ->getElementType()) ==
-                   getContext().LongDoubleTy)
-      // Complex Long Double Type is passed in Memory when Regcall
-      // calling convention is used.
-      FI.getReturnInfo() = getIndirectReturnResult(FI.getReturnType());
-    else
-      FI.getReturnInfo() = classifyReturnType(FI.getReturnType());
-  }
-
-  // If the return value is indirect, then the hidden argument is consuming one
-  // integer register.
-  if (FI.getReturnInfo().isIndirect())
-    --FreeIntRegs;
-  else if (NeededSSE && MaxVectorWidth > 0)
-    FI.setMaxVectorWidth(MaxVectorWidth);
-
-  // The chain argument effectively gives us another free register.
-  if (FI.isChainCall())
-    ++FreeIntRegs;
-
-  unsigned NumRequiredArgs = FI.getNumRequiredArgs();
-  // AMD64-ABI 3.2.3p3: Once arguments are classified, the registers
-  // get assigned (in left-to-right order) for passing as follows...
-  unsigned ArgNo = 0;
-  for (CGFunctionInfo::arg_iterator it = FI.arg_begin(), ie = FI.arg_end();
-       it != ie; ++it, ++ArgNo) {
-    bool IsNamedArg = ArgNo < NumRequiredArgs;
-
-    if (IsRegCall && it->type->isStructureOrClassType())
-      it->info = classifyRegCallStructType(it->type, NeededInt, NeededSSE,
-                                           MaxVectorWidth);
-    else
-      it->info = classifyArgumentType(it->type, FreeIntRegs, NeededInt,
-                                      NeededSSE, IsNamedArg);
-
-    // AMD64-ABI 3.2.3p3: If there are no registers available for any
-    // eightbyte of an argument, the whole argument is passed on the
-    // stack. If registers have already been assigned for some
-    // eightbytes of such an argument, the assignments get reverted.
-    if (FreeIntRegs >= NeededInt && FreeSSERegs >= NeededSSE) {
-      FreeIntRegs -= NeededInt;
-      FreeSSERegs -= NeededSSE;
-      if (MaxVectorWidth > FI.getMaxVectorWidth())
-        FI.setMaxVectorWidth(MaxVectorWidth);
-    } else {
-      it->info = getIndirectResult(it->type, FreeIntRegs);
-    }
-  }
-}
-
-static Address EmitX86_64VAArgFromMemory(CodeGenFunction &CGF,
-                                         Address VAListAddr, QualType Ty) {
-  Address overflow_arg_area_p =
-      CGF.Builder.CreateStructGEP(VAListAddr, 2, "overflow_arg_area_p");
-  llvm::Value *overflow_arg_area =
-    CGF.Builder.CreateLoad(overflow_arg_area_p, "overflow_arg_area");
-
-  // AMD64-ABI 3.5.7p5: Step 7. Align l->overflow_arg_area upwards to a 16
-  // byte boundary if alignment needed by type exceeds 8 byte boundary.
-  // It isn't stated explicitly in the standard, but in practice we use
-  // alignment greater than 16 where necessary.
-  CharUnits Align = CGF.getContext().getTypeAlignInChars(Ty);
-  if (Align > CharUnits::fromQuantity(8)) {
-    overflow_arg_area = emitRoundPointerUpToAlignment(CGF, overflow_arg_area,
-                                                      Align);
-  }
-
-  // AMD64-ABI 3.5.7p5: Step 8. Fetch type from l->overflow_arg_area.
-  llvm::Type *LTy = CGF.ConvertTypeForMem(Ty);
-  llvm::Value *Res =
-    CGF.Builder.CreateBitCast(overflow_arg_area,
-                              llvm::PointerType::getUnqual(LTy));
-
-  // AMD64-ABI 3.5.7p5: Step 9. Set l->overflow_arg_area to:
-  // l->overflow_arg_area + sizeof(type).
-  // AMD64-ABI 3.5.7p5: Step 10. Align l->overflow_arg_area upwards to
-  // an 8 byte boundary.
-
-  uint64_t SizeInBytes = (CGF.getContext().getTypeSize(Ty) + 7) / 8;
-  llvm::Value *Offset =
-      llvm::ConstantInt::get(CGF.Int32Ty, (SizeInBytes + 7)  & ~7);
-  overflow_arg_area = CGF.Builder.CreateGEP(CGF.Int8Ty, overflow_arg_area,
-                                            Offset, "overflow_arg_area.next");
-  CGF.Builder.CreateStore(overflow_arg_area, overflow_arg_area_p);
-
-  // AMD64-ABI 3.5.7p5: Step 11. Return the fetched type.
-  return Address(Res, LTy, Align);
-}
-
-Address X86_64ABIInfo::EmitVAArg(CodeGenFunction &CGF, Address VAListAddr,
-                                 QualType Ty) const {
-  // Assume that va_list type is correct; should be pointer to LLVM type:
-  // struct {
-  //   i32 gp_offset;
-  //   i32 fp_offset;
-  //   i8* overflow_arg_area;
-  //   i8* reg_save_area;
-  // };
-  unsigned neededInt, neededSSE;
-
-  Ty = getContext().getCanonicalType(Ty);
-  ABIArgInfo AI = classifyArgumentType(Ty, 0, neededInt, neededSSE,
-                                       /*isNamedArg*/false);
-
-  // AMD64-ABI 3.5.7p5: Step 1. Determine whether type may be passed
-  // in the registers. If not go to step 7.
-  if (!neededInt && !neededSSE)
-    return EmitX86_64VAArgFromMemory(CGF, VAListAddr, Ty);
-
-  // AMD64-ABI 3.5.7p5: Step 2. Compute num_gp to hold the number of
-  // general purpose registers needed to pass type and num_fp to hold
-  // the number of floating point registers needed.
-
-  // AMD64-ABI 3.5.7p5: Step 3. Verify whether arguments fit into
-  // registers. In the case: l->gp_offset > 48 - num_gp * 8 or
-  // l->fp_offset > 304 - num_fp * 16 go to step 7.
-  //
-  // NOTE: 304 is a typo, there are (6 * 8 + 8 * 16) = 176 bytes of
-  // register save space).
-
-  llvm::Value *InRegs = nullptr;
-  Address gp_offset_p = Address::invalid(), fp_offset_p = Address::invalid();
-  llvm::Value *gp_offset = nullptr, *fp_offset = nullptr;
-  if (neededInt) {
-    gp_offset_p = CGF.Builder.CreateStructGEP(VAListAddr, 0, "gp_offset_p");
-    gp_offset = CGF.Builder.CreateLoad(gp_offset_p, "gp_offset");
-    InRegs = llvm::ConstantInt::get(CGF.Int32Ty, 48 - neededInt * 8);
-    InRegs = CGF.Builder.CreateICmpULE(gp_offset, InRegs, "fits_in_gp");
-  }
-
-  if (neededSSE) {
-    fp_offset_p = CGF.Builder.CreateStructGEP(VAListAddr, 1, "fp_offset_p");
-    fp_offset = CGF.Builder.CreateLoad(fp_offset_p, "fp_offset");
-    llvm::Value *FitsInFP =
-      llvm::ConstantInt::get(CGF.Int32Ty, 176 - neededSSE * 16);
-    FitsInFP = CGF.Builder.CreateICmpULE(fp_offset, FitsInFP, "fits_in_fp");
-    InRegs = InRegs ? CGF.Builder.CreateAnd(InRegs, FitsInFP) : FitsInFP;
-  }
-
-  llvm::BasicBlock *InRegBlock = CGF.createBasicBlock("vaarg.in_reg");
-  llvm::BasicBlock *InMemBlock = CGF.createBasicBlock("vaarg.in_mem");
-  llvm::BasicBlock *ContBlock = CGF.createBasicBlock("vaarg.end");
-  CGF.Builder.CreateCondBr(InRegs, InRegBlock, InMemBlock);
-
-  // Emit code to load the value if it was passed in registers.
-
-  CGF.EmitBlock(InRegBlock);
-
-  // AMD64-ABI 3.5.7p5: Step 4. Fetch type from l->reg_save_area with
-  // an offset of l->gp_offset and/or l->fp_offset. This may require
-  // copying to a temporary location in case the parameter is passed
-  // in different register classes or requires an alignment greater
-  // than 8 for general purpose registers and 16 for XMM registers.
-  //
-  // FIXME: This really results in shameful code when we end up needing to
-  // collect arguments from different places; often what should result in a
-  // simple assembling of a structure from scattered addresses has many more
-  // loads than necessary. Can we clean this up?
-  llvm::Type *LTy = CGF.ConvertTypeForMem(Ty);
-  llvm::Value *RegSaveArea = CGF.Builder.CreateLoad(
-      CGF.Builder.CreateStructGEP(VAListAddr, 3), "reg_save_area");
-
-  Address RegAddr = Address::invalid();
-  if (neededInt && neededSSE) {
-    // FIXME: Cleanup.
-    assert(AI.isDirect() && "Unexpected ABI info for mixed regs");
-    llvm::StructType *ST = cast<llvm::StructType>(AI.getCoerceToType());
-    Address Tmp = CGF.CreateMemTemp(Ty);
-    Tmp = CGF.Builder.CreateElementBitCast(Tmp, ST);
-    assert(ST->getNumElements() == 2 && "Unexpected ABI info for mixed regs");
-    llvm::Type *TyLo = ST->getElementType(0);
-    llvm::Type *TyHi = ST->getElementType(1);
-    assert((TyLo->isFPOrFPVectorTy() ^ TyHi->isFPOrFPVectorTy()) &&
-           "Unexpected ABI info for mixed regs");
-    llvm::Type *PTyLo = llvm::PointerType::getUnqual(TyLo);
-    llvm::Type *PTyHi = llvm::PointerType::getUnqual(TyHi);
-    llvm::Value *GPAddr =
-        CGF.Builder.CreateGEP(CGF.Int8Ty, RegSaveArea, gp_offset);
-    llvm::Value *FPAddr =
-        CGF.Builder.CreateGEP(CGF.Int8Ty, RegSaveArea, fp_offset);
-    llvm::Value *RegLoAddr = TyLo->isFPOrFPVectorTy() ? FPAddr : GPAddr;
-    llvm::Value *RegHiAddr = TyLo->isFPOrFPVectorTy() ? GPAddr : FPAddr;
-
-    // Copy the first element.
-    // FIXME: Our choice of alignment here and below is probably pessimistic.
-    llvm::Value *V = CGF.Builder.CreateAlignedLoad(
-        TyLo, CGF.Builder.CreateBitCast(RegLoAddr, PTyLo),
-        CharUnits::fromQuantity(getDataLayout().getABITypeAlign(TyLo)));
-    CGF.Builder.CreateStore(V, CGF.Builder.CreateStructGEP(Tmp, 0));
-
-    // Copy the second element.
-    V = CGF.Builder.CreateAlignedLoad(
-        TyHi, CGF.Builder.CreateBitCast(RegHiAddr, PTyHi),
-        CharUnits::fromQuantity(getDataLayout().getABITypeAlign(TyHi)));
-    CGF.Builder.CreateStore(V, CGF.Builder.CreateStructGEP(Tmp, 1));
-
-    RegAddr = CGF.Builder.CreateElementBitCast(Tmp, LTy);
-  } else if (neededInt) {
-    RegAddr = Address(CGF.Builder.CreateGEP(CGF.Int8Ty, RegSaveArea, gp_offset),
-                      CGF.Int8Ty, CharUnits::fromQuantity(8));
-    RegAddr = CGF.Builder.CreateElementBitCast(RegAddr, LTy);
-
-    // Copy to a temporary if necessary to ensure the appropriate alignment.
-    auto TInfo = getContext().getTypeInfoInChars(Ty);
-    uint64_t TySize = TInfo.Width.getQuantity();
-    CharUnits TyAlign = TInfo.Align;
-
-    // Copy into a temporary if the type is more aligned than the
-    // register save area.
-    if (TyAlign.getQuantity() > 8) {
-      Address Tmp = CGF.CreateMemTemp(Ty);
-      CGF.Builder.CreateMemCpy(Tmp, RegAddr, TySize, false);
-      RegAddr = Tmp;
-    }
-
-  } else if (neededSSE == 1) {
-    RegAddr = Address(CGF.Builder.CreateGEP(CGF.Int8Ty, RegSaveArea, fp_offset),
-                      CGF.Int8Ty, CharUnits::fromQuantity(16));
-    RegAddr = CGF.Builder.CreateElementBitCast(RegAddr, LTy);
-  } else {
-    assert(neededSSE == 2 && "Invalid number of needed registers!");
-    // SSE registers are spaced 16 bytes apart in the register save
-    // area, we need to collect the two eightbytes together.
-    // The ABI isn't explicit about this, but it seems reasonable
-    // to assume that the slots are 16-byte aligned, since the stack is
-    // naturally 16-byte aligned and the prologue is expected to store
-    // all the SSE registers to the RSA.
-    Address RegAddrLo = Address(CGF.Builder.CreateGEP(CGF.Int8Ty, RegSaveArea,
-                                                      fp_offset),
-                                CGF.Int8Ty, CharUnits::fromQuantity(16));
-    Address RegAddrHi =
-      CGF.Builder.CreateConstInBoundsByteGEP(RegAddrLo,
-                                             CharUnits::fromQuantity(16));
-    llvm::Type *ST = AI.canHaveCoerceToType()
-                         ? AI.getCoerceToType()
-                         : llvm::StructType::get(CGF.DoubleTy, CGF.DoubleTy);
-    llvm::Value *V;
-    Address Tmp = CGF.CreateMemTemp(Ty);
-    Tmp = CGF.Builder.CreateElementBitCast(Tmp, ST);
-    V = CGF.Builder.CreateLoad(CGF.Builder.CreateElementBitCast(
-        RegAddrLo, ST->getStructElementType(0)));
-    CGF.Builder.CreateStore(V, CGF.Builder.CreateStructGEP(Tmp, 0));
-    V = CGF.Builder.CreateLoad(CGF.Builder.CreateElementBitCast(
-        RegAddrHi, ST->getStructElementType(1)));
-    CGF.Builder.CreateStore(V, CGF.Builder.CreateStructGEP(Tmp, 1));
-
-    RegAddr = CGF.Builder.CreateElementBitCast(Tmp, LTy);
-  }
-
-  // AMD64-ABI 3.5.7p5: Step 5. Set:
-  // l->gp_offset = l->gp_offset + num_gp * 8
-  // l->fp_offset = l->fp_offset + num_fp * 16.
-  if (neededInt) {
-    llvm::Value *Offset = llvm::ConstantInt::get(CGF.Int32Ty, neededInt * 8);
-    CGF.Builder.CreateStore(CGF.Builder.CreateAdd(gp_offset, Offset),
-                            gp_offset_p);
-  }
-  if (neededSSE) {
-    llvm::Value *Offset = llvm::ConstantInt::get(CGF.Int32Ty, neededSSE * 16);
-    CGF.Builder.CreateStore(CGF.Builder.CreateAdd(fp_offset, Offset),
-                            fp_offset_p);
-  }
-  CGF.EmitBranch(ContBlock);
-
-  // Emit code to load the value if it was passed in memory.
-
-  CGF.EmitBlock(InMemBlock);
-  Address MemAddr = EmitX86_64VAArgFromMemory(CGF, VAListAddr, Ty);
-
-  // Return the appropriate result.
-
-  CGF.EmitBlock(ContBlock);
-  Address ResAddr = emitMergePHI(CGF, RegAddr, InRegBlock, MemAddr, InMemBlock,
-                                 "vaarg.addr");
-  return ResAddr;
-}
-
-Address X86_64ABIInfo::EmitMSVAArg(CodeGenFunction &CGF, Address VAListAddr,
-                                   QualType Ty) const {
-  // MS x64 ABI requirement: "Any argument that doesn't fit in 8 bytes, or is
-  // not 1, 2, 4, or 8 bytes, must be passed by reference."
-  uint64_t Width = getContext().getTypeSize(Ty);
-  bool IsIndirect = Width > 64 || !llvm::isPowerOf2_64(Width);
-
-  return emitVoidPtrVAArg(CGF, VAListAddr, Ty, IsIndirect,
-                          CGF.getContext().getTypeInfoInChars(Ty),
-                          CharUnits::fromQuantity(8),
-                          /*allowHigherAlign*/ false);
-}
-
-ABIArgInfo WinX86_64ABIInfo::reclassifyHvaArgForVectorCall(
-    QualType Ty, unsigned &FreeSSERegs, const ABIArgInfo &current) const {
-  const Type *Base = nullptr;
-  uint64_t NumElts = 0;
-
-  if (!Ty->isBuiltinType() && !Ty->isVectorType() &&
-      isHomogeneousAggregate(Ty, Base, NumElts) && FreeSSERegs >= NumElts) {
-    FreeSSERegs -= NumElts;
-    return getDirectX86Hva();
-  }
-  return current;
-}
-
-ABIArgInfo WinX86_64ABIInfo::classify(QualType Ty, unsigned &FreeSSERegs,
-                                      bool IsReturnType, bool IsVectorCall,
-                                      bool IsRegCall) const {
-
-  if (Ty->isVoidType())
-    return ABIArgInfo::getIgnore();
-
-  if (const EnumType *EnumTy = Ty->getAs<EnumType>())
-    Ty = EnumTy->getDecl()->getIntegerType();
-
-  TypeInfo Info = getContext().getTypeInfo(Ty);
-  uint64_t Width = Info.Width;
-  CharUnits Align = getContext().toCharUnitsFromBits(Info.Align);
-
-  const RecordType *RT = Ty->getAs<RecordType>();
-  if (RT) {
-    if (!IsReturnType) {
-      if (CGCXXABI::RecordArgABI RAA = getRecordArgABI(RT, getCXXABI()))
-        return getNaturalAlignIndirect(Ty, RAA == CGCXXABI::RAA_DirectInMemory);
-    }
-
-    if (RT->getDecl()->hasFlexibleArrayMember())
-      return getNaturalAlignIndirect(Ty, /*ByVal=*/false);
-
-  }
-
-  const Type *Base = nullptr;
-  uint64_t NumElts = 0;
-  // vectorcall adds the concept of a homogenous vector aggregate, similar to
-  // other targets.
-  if ((IsVectorCall || IsRegCall) &&
-      isHomogeneousAggregate(Ty, Base, NumElts)) {
-    if (IsRegCall) {
-      if (FreeSSERegs >= NumElts) {
-        FreeSSERegs -= NumElts;
-        if (IsReturnType || Ty->isBuiltinType() || Ty->isVectorType())
-          return ABIArgInfo::getDirect();
-        return ABIArgInfo::getExpand();
-      }
-      return ABIArgInfo::getIndirect(Align, /*ByVal=*/false);
-    } else if (IsVectorCall) {
-      if (FreeSSERegs >= NumElts &&
-          (IsReturnType || Ty->isBuiltinType() || Ty->isVectorType())) {
-        FreeSSERegs -= NumElts;
-        return ABIArgInfo::getDirect();
-      } else if (IsReturnType) {
-        return ABIArgInfo::getExpand();
-      } else if (!Ty->isBuiltinType() && !Ty->isVectorType()) {
-        // HVAs are delayed and reclassified in the 2nd step.
-        return ABIArgInfo::getIndirect(Align, /*ByVal=*/false);
-      }
-    }
-  }
-
-  if (Ty->isMemberPointerType()) {
-    // If the member pointer is represented by an LLVM int or ptr, pass it
-    // directly.
-    llvm::Type *LLTy = CGT.ConvertType(Ty);
-    if (LLTy->isPointerTy() || LLTy->isIntegerTy())
-      return ABIArgInfo::getDirect();
-  }
-
-  if (RT || Ty->isAnyComplexType() || Ty->isMemberPointerType()) {
-    // MS x64 ABI requirement: "Any argument that doesn't fit in 8 bytes, or is
-    // not 1, 2, 4, or 8 bytes, must be passed by reference."
-    if (Width > 64 || !llvm::isPowerOf2_64(Width))
-      return getNaturalAlignIndirect(Ty, /*ByVal=*/false);
-
-    // Otherwise, coerce it to a small integer.
-    return ABIArgInfo::getDirect(llvm::IntegerType::get(getVMContext(), Width));
-  }
-
-  if (const BuiltinType *BT = Ty->getAs<BuiltinType>()) {
-    switch (BT->getKind()) {
-    case BuiltinType::Bool:
-      // Bool type is always extended to the ABI, other builtin types are not
-      // extended.
-      return ABIArgInfo::getExtend(Ty);
-
-    case BuiltinType::LongDouble:
-      // Mingw64 GCC uses the old 80 bit extended precision floating point
-      // unit. It passes them indirectly through memory.
-      if (IsMingw64) {
-        const llvm::fltSemantics *LDF = &getTarget().getLongDoubleFormat();
-        if (LDF == &llvm::APFloat::x87DoubleExtended())
-          return ABIArgInfo::getIndirect(Align, /*ByVal=*/false);
-      }
-      break;
-
-    case BuiltinType::Int128:
-    case BuiltinType::UInt128:
-      // If it's a parameter type, the normal ABI rule is that arguments larger
-      // than 8 bytes are passed indirectly. GCC follows it. We follow it too,
-      // even though it isn't particularly efficient.
-      if (!IsReturnType)
-        return ABIArgInfo::getIndirect(Align, /*ByVal=*/false);
-
-      // Mingw64 GCC returns i128 in XMM0. Coerce to v2i64 to handle that.
-      // Clang matches them for compatibility.
-      return ABIArgInfo::getDirect(llvm::FixedVectorType::get(
-          llvm::Type::getInt64Ty(getVMContext()), 2));
-
-    default:
-      break;
-    }
-  }
-
-  if (Ty->isBitIntType()) {
-    // MS x64 ABI requirement: "Any argument that doesn't fit in 8 bytes, or is
-    // not 1, 2, 4, or 8 bytes, must be passed by reference."
-    // However, non-power-of-two bit-precise integers will be passed as 1, 2, 4,
-    // or 8 bytes anyway as long is it fits in them, so we don't have to check
-    // the power of 2.
-    if (Width <= 64)
-      return ABIArgInfo::getDirect();
-    return ABIArgInfo::getIndirect(Align, /*ByVal=*/false);
-  }
-
-  return ABIArgInfo::getDirect();
-}
-
-void WinX86_64ABIInfo::computeInfo(CGFunctionInfo &FI) const {
-  const unsigned CC = FI.getCallingConvention();
-  bool IsVectorCall = CC == llvm::CallingConv::X86_VectorCall;
-  bool IsRegCall = CC == llvm::CallingConv::X86_RegCall;
-
-  // If __attribute__((sysv_abi)) is in use, use the SysV argument
-  // classification rules.
-  if (CC == llvm::CallingConv::X86_64_SysV) {
-    X86_64ABIInfo SysVABIInfo(CGT, AVXLevel);
-    SysVABIInfo.computeInfo(FI);
-    return;
-  }
-
-  unsigned FreeSSERegs = 0;
-  if (IsVectorCall) {
-    // We can use up to 4 SSE return registers with vectorcall.
-    FreeSSERegs = 4;
-  } else if (IsRegCall) {
-    // RegCall gives us 16 SSE registers.
-    FreeSSERegs = 16;
-  }
-
-  if (!getCXXABI().classifyReturnType(FI))
-    FI.getReturnInfo() = classify(FI.getReturnType(), FreeSSERegs, true,
-                                  IsVectorCall, IsRegCall);
-
-  if (IsVectorCall) {
-    // We can use up to 6 SSE register parameters with vectorcall.
-    FreeSSERegs = 6;
-  } else if (IsRegCall) {
-    // RegCall gives us 16 SSE registers, we can reuse the return registers.
-    FreeSSERegs = 16;
-  }
-
-  unsigned ArgNum = 0;
-  unsigned ZeroSSERegs = 0;
-  for (auto &I : FI.arguments()) {
-    // Vectorcall in x64 only permits the first 6 arguments to be passed as
-    // XMM/YMM registers. After the sixth argument, pretend no vector
-    // registers are left.
-    unsigned *MaybeFreeSSERegs =
-        (IsVectorCall && ArgNum >= 6) ? &ZeroSSERegs : &FreeSSERegs;
-    I.info =
-        classify(I.type, *MaybeFreeSSERegs, false, IsVectorCall, IsRegCall);
-    ++ArgNum;
-  }
-
-  if (IsVectorCall) {
-    // For vectorcall, assign aggregate HVAs to any free vector registers in a
-    // second pass.
-    for (auto &I : FI.arguments())
-      I.info = reclassifyHvaArgForVectorCall(I.type, FreeSSERegs, I.info);
-  }
-}
-
-Address WinX86_64ABIInfo::EmitVAArg(CodeGenFunction &CGF, Address VAListAddr,
-                                    QualType Ty) const {
-  // MS x64 ABI requirement: "Any argument that doesn't fit in 8 bytes, or is
-  // not 1, 2, 4, or 8 bytes, must be passed by reference."
-  uint64_t Width = getContext().getTypeSize(Ty);
-  bool IsIndirect = Width > 64 || !llvm::isPowerOf2_64(Width);
-
-  return emitVoidPtrVAArg(CGF, VAListAddr, Ty, IsIndirect,
-                          CGF.getContext().getTypeInfoInChars(Ty),
-                          CharUnits::fromQuantity(8),
-                          /*allowHigherAlign*/ false);
-}
-
-static bool PPC_initDwarfEHRegSizeTable(CodeGen::CodeGenFunction &CGF,
-                                        llvm::Value *Address, bool Is64Bit,
-                                        bool IsAIX) {
-  // This is calculated from the LLVM and GCC tables and verified
-  // against gcc output.  AFAIK all PPC ABIs use the same encoding.
-
-  CodeGen::CGBuilderTy &Builder = CGF.Builder;
-
-  llvm::IntegerType *i8 = CGF.Int8Ty;
-  llvm::Value *Four8 = llvm::ConstantInt::get(i8, 4);
-  llvm::Value *Eight8 = llvm::ConstantInt::get(i8, 8);
-  llvm::Value *Sixteen8 = llvm::ConstantInt::get(i8, 16);
-
-  // 0-31: r0-31, the 4-byte or 8-byte general-purpose registers
-  AssignToArrayRange(Builder, Address, Is64Bit ? Eight8 : Four8, 0, 31);
-
-  // 32-63: fp0-31, the 8-byte floating-point registers
-  AssignToArrayRange(Builder, Address, Eight8, 32, 63);
-
-  // 64-67 are various 4-byte or 8-byte special-purpose registers:
-  // 64: mq
-  // 65: lr
-  // 66: ctr
-  // 67: ap
-  AssignToArrayRange(Builder, Address, Is64Bit ? Eight8 : Four8, 64, 67);
-
-  // 68-76 are various 4-byte special-purpose registers:
-  // 68-75 cr0-7
-  // 76: xer
-  AssignToArrayRange(Builder, Address, Four8, 68, 76);
-
-  // 77-108: v0-31, the 16-byte vector registers
-  AssignToArrayRange(Builder, Address, Sixteen8, 77, 108);
-
-  // 109: vrsave
-  // 110: vscr
-  AssignToArrayRange(Builder, Address, Is64Bit ? Eight8 : Four8, 109, 110);
-
-  // AIX does not utilize the rest of the registers.
-  if (IsAIX)
-    return false;
-
-  // 111: spe_acc
-  // 112: spefscr
-  // 113: sfp
-  AssignToArrayRange(Builder, Address, Is64Bit ? Eight8 : Four8, 111, 113);
-
-  if (!Is64Bit)
-    return false;
-
-  // TODO: Need to verify if these registers are used on 64 bit AIX with Power8
-  // or above CPU.
-  // 64-bit only registers:
-  // 114: tfhar
-  // 115: tfiar
-  // 116: texasr
-  AssignToArrayRange(Builder, Address, Eight8, 114, 116);
-
-  return false;
-}
-
-// AIX
-namespace {
-/// AIXABIInfo - The AIX XCOFF ABI information.
-class AIXABIInfo : public ABIInfo {
-  const bool Is64Bit;
-  const unsigned PtrByteSize;
-  CharUnits getParamTypeAlignment(QualType Ty) const;
-
-public:
-  AIXABIInfo(CodeGen::CodeGenTypes &CGT, bool Is64Bit)
-      : ABIInfo(CGT), Is64Bit(Is64Bit), PtrByteSize(Is64Bit ? 8 : 4) {}
-
-  bool isPromotableTypeForABI(QualType Ty) const;
-
-  ABIArgInfo classifyReturnType(QualType RetTy) const;
-  ABIArgInfo classifyArgumentType(QualType Ty) const;
-
-  void computeInfo(CGFunctionInfo &FI) const override {
-    if (!getCXXABI().classifyReturnType(FI))
-      FI.getReturnInfo() = classifyReturnType(FI.getReturnType());
-
-    for (auto &I : FI.arguments())
-      I.info = classifyArgumentType(I.type);
-  }
-
-  Address EmitVAArg(CodeGenFunction &CGF, Address VAListAddr,
-                    QualType Ty) const override;
-};
-
-class AIXTargetCodeGenInfo : public TargetCodeGenInfo {
-  const bool Is64Bit;
-
-public:
-  AIXTargetCodeGenInfo(CodeGen::CodeGenTypes &CGT, bool Is64Bit)
-      : TargetCodeGenInfo(std::make_unique<AIXABIInfo>(CGT, Is64Bit)),
-        Is64Bit(Is64Bit) {}
-  int getDwarfEHStackPointer(CodeGen::CodeGenModule &M) const override {
-    return 1; // r1 is the dedicated stack pointer
-  }
-
-  bool initDwarfEHRegSizeTable(CodeGen::CodeGenFunction &CGF,
-                               llvm::Value *Address) const override;
-};
-} // namespace
-
-// Return true if the ABI requires Ty to be passed sign- or zero-
-// extended to 32/64 bits.
-bool AIXABIInfo::isPromotableTypeForABI(QualType Ty) const {
-  // Treat an enum type as its underlying type.
-  if (const EnumType *EnumTy = Ty->getAs<EnumType>())
-    Ty = EnumTy->getDecl()->getIntegerType();
-
-  // Promotable integer types are required to be promoted by the ABI.
-  if (getContext().isPromotableIntegerType(Ty))
-    return true;
-
-  if (!Is64Bit)
-    return false;
-
-  // For 64 bit mode, in addition to the usual promotable integer types, we also
-  // need to extend all 32-bit types, since the ABI requires promotion to 64
-  // bits.
-  if (const BuiltinType *BT = Ty->getAs<BuiltinType>())
-    switch (BT->getKind()) {
-    case BuiltinType::Int:
-    case BuiltinType::UInt:
-      return true;
-    default:
-      break;
-    }
-
-  return false;
-}
-
-ABIArgInfo AIXABIInfo::classifyReturnType(QualType RetTy) const {
-  if (RetTy->isAnyComplexType())
-    return ABIArgInfo::getDirect();
-
-  if (RetTy->isVectorType())
-    return ABIArgInfo::getDirect();
-
-  if (RetTy->isVoidType())
-    return ABIArgInfo::getIgnore();
-
-  if (isAggregateTypeForABI(RetTy))
-    return getNaturalAlignIndirect(RetTy);
-
-  return (isPromotableTypeForABI(RetTy) ? ABIArgInfo::getExtend(RetTy)
-                                        : ABIArgInfo::getDirect());
-}
-
-ABIArgInfo AIXABIInfo::classifyArgumentType(QualType Ty) const {
-  Ty = useFirstFieldIfTransparentUnion(Ty);
-
-  if (Ty->isAnyComplexType())
-    return ABIArgInfo::getDirect();
-
-  if (Ty->isVectorType())
-    return ABIArgInfo::getDirect();
-
-  if (isAggregateTypeForABI(Ty)) {
-    // Records with non-trivial destructors/copy-constructors should not be
-    // passed by value.
-    if (CGCXXABI::RecordArgABI RAA = getRecordArgABI(Ty, getCXXABI()))
-      return getNaturalAlignIndirect(Ty, RAA == CGCXXABI::RAA_DirectInMemory);
-
-    CharUnits CCAlign = getParamTypeAlignment(Ty);
-    CharUnits TyAlign = getContext().getTypeAlignInChars(Ty);
-
-    return ABIArgInfo::getIndirect(CCAlign, /*ByVal*/ true,
-                                   /*Realign*/ TyAlign > CCAlign);
-  }
-
-  return (isPromotableTypeForABI(Ty) ? ABIArgInfo::getExtend(Ty)
-                                     : ABIArgInfo::getDirect());
-}
-
-CharUnits AIXABIInfo::getParamTypeAlignment(QualType Ty) const {
-  // Complex types are passed just like their elements.
-  if (const ComplexType *CTy = Ty->getAs<ComplexType>())
-    Ty = CTy->getElementType();
-
-  if (Ty->isVectorType())
-    return CharUnits::fromQuantity(16);
-
-  // If the structure contains a vector type, the alignment is 16.
-  if (isRecordWithSIMDVectorType(getContext(), Ty))
-    return CharUnits::fromQuantity(16);
-
-  return CharUnits::fromQuantity(PtrByteSize);
-}
-
-Address AIXABIInfo::EmitVAArg(CodeGenFunction &CGF, Address VAListAddr,
-                              QualType Ty) const {
-
-  auto TypeInfo = getContext().getTypeInfoInChars(Ty);
-  TypeInfo.Align = getParamTypeAlignment(Ty);
-
-  CharUnits SlotSize = CharUnits::fromQuantity(PtrByteSize);
-
-  // If we have a complex type and the base type is smaller than the register
-  // size, the ABI calls for the real and imaginary parts to be right-adjusted
-  // in separate words in 32bit mode or doublewords in 64bit mode. However,
-  // Clang expects us to produce a pointer to a structure with the two parts
-  // packed tightly. So generate loads of the real and imaginary parts relative
-  // to the va_list pointer, and store them to a temporary structure. We do the
-  // same as the PPC64ABI here.
-  if (const ComplexType *CTy = Ty->getAs<ComplexType>()) {
-    CharUnits EltSize = TypeInfo.Width / 2;
-    if (EltSize < SlotSize)
-      return complexTempStructure(CGF, VAListAddr, Ty, SlotSize, EltSize, CTy);
-  }
-
-  return emitVoidPtrVAArg(CGF, VAListAddr, Ty, /*Indirect*/ false, TypeInfo,
-                          SlotSize, /*AllowHigher*/ true);
-}
-
-bool AIXTargetCodeGenInfo::initDwarfEHRegSizeTable(
-    CodeGen::CodeGenFunction &CGF, llvm::Value *Address) const {
-  return PPC_initDwarfEHRegSizeTable(CGF, Address, Is64Bit, /*IsAIX*/ true);
-}
-
-// PowerPC-32
-namespace {
-/// PPC32_SVR4_ABIInfo - The 32-bit PowerPC ELF (SVR4) ABI information.
-class PPC32_SVR4_ABIInfo : public DefaultABIInfo {
-  bool IsSoftFloatABI;
-  bool IsRetSmallStructInRegABI;
-
-  CharUnits getParamTypeAlignment(QualType Ty) const;
-
-public:
-  PPC32_SVR4_ABIInfo(CodeGen::CodeGenTypes &CGT, bool SoftFloatABI,
-                     bool RetSmallStructInRegABI)
-      : DefaultABIInfo(CGT), IsSoftFloatABI(SoftFloatABI),
-        IsRetSmallStructInRegABI(RetSmallStructInRegABI) {}
-
-  ABIArgInfo classifyReturnType(QualType RetTy) const;
-
-  void computeInfo(CGFunctionInfo &FI) const override {
-    if (!getCXXABI().classifyReturnType(FI))
-      FI.getReturnInfo() = classifyReturnType(FI.getReturnType());
-    for (auto &I : FI.arguments())
-      I.info = classifyArgumentType(I.type);
-  }
-
-  Address EmitVAArg(CodeGenFunction &CGF, Address VAListAddr,
-                    QualType Ty) const override;
-};
-
-class PPC32TargetCodeGenInfo : public TargetCodeGenInfo {
-public:
-  PPC32TargetCodeGenInfo(CodeGenTypes &CGT, bool SoftFloatABI,
-                         bool RetSmallStructInRegABI)
-      : TargetCodeGenInfo(std::make_unique<PPC32_SVR4_ABIInfo>(
-            CGT, SoftFloatABI, RetSmallStructInRegABI)) {}
-
-  static bool isStructReturnInRegABI(const llvm::Triple &Triple,
-                                     const CodeGenOptions &Opts);
-
-  int getDwarfEHStackPointer(CodeGen::CodeGenModule &M) const override {
-    // This is recovered from gcc output.
-    return 1; // r1 is the dedicated stack pointer
-  }
-
-  bool initDwarfEHRegSizeTable(CodeGen::CodeGenFunction &CGF,
-                               llvm::Value *Address) const override;
-};
-}
-
-CharUnits PPC32_SVR4_ABIInfo::getParamTypeAlignment(QualType Ty) const {
-  // Complex types are passed just like their elements.
-  if (const ComplexType *CTy = Ty->getAs<ComplexType>())
-    Ty = CTy->getElementType();
-
-  if (Ty->isVectorType())
-    return CharUnits::fromQuantity(getContext().getTypeSize(Ty) == 128 ? 16
-                                                                       : 4);
-
-  // For single-element float/vector structs, we consider the whole type
-  // to have the same alignment requirements as its single element.
-  const Type *AlignTy = nullptr;
-  if (const Type *EltType = isSingleElementStruct(Ty, getContext())) {
-    const BuiltinType *BT = EltType->getAs<BuiltinType>();
-    if ((EltType->isVectorType() && getContext().getTypeSize(EltType) == 128) ||
-        (BT && BT->isFloatingPoint()))
-      AlignTy = EltType;
-  }
-
-  if (AlignTy)
-    return CharUnits::fromQuantity(AlignTy->isVectorType() ? 16 : 4);
-  return CharUnits::fromQuantity(4);
-}
-
-ABIArgInfo PPC32_SVR4_ABIInfo::classifyReturnType(QualType RetTy) const {
-  uint64_t Size;
-
-  // -msvr4-struct-return puts small aggregates in GPR3 and GPR4.
-  if (isAggregateTypeForABI(RetTy) && IsRetSmallStructInRegABI &&
-      (Size = getContext().getTypeSize(RetTy)) <= 64) {
-    // System V ABI (1995), page 3-22, specified:
-    // > A structure or union whose size is less than or equal to 8 bytes
-    // > shall be returned in r3 and r4, as if it were first stored in the
-    // > 8-byte aligned memory area and then the low addressed word were
-    // > loaded into r3 and the high-addressed word into r4.  Bits beyond
-    // > the last member of the structure or union are not defined.
-    //
-    // GCC for big-endian PPC32 inserts the pad before the first member,
-    // not "beyond the last member" of the struct.  To stay compatible
-    // with GCC, we coerce the struct to an integer of the same size.
-    // LLVM will extend it and return i32 in r3, or i64 in r3:r4.
-    if (Size == 0)
-      return ABIArgInfo::getIgnore();
-    else {
-      llvm::Type *CoerceTy = llvm::Type::getIntNTy(getVMContext(), Size);
-      return ABIArgInfo::getDirect(CoerceTy);
-    }
-  }
-
-  return DefaultABIInfo::classifyReturnType(RetTy);
-}
-
-// TODO: this implementation is now likely redundant with
-// DefaultABIInfo::EmitVAArg.
-Address PPC32_SVR4_ABIInfo::EmitVAArg(CodeGenFunction &CGF, Address VAList,
-                                      QualType Ty) const {
-  if (getTarget().getTriple().isOSDarwin()) {
-    auto TI = getContext().getTypeInfoInChars(Ty);
-    TI.Align = getParamTypeAlignment(Ty);
-
-    CharUnits SlotSize = CharUnits::fromQuantity(4);
-    return emitVoidPtrVAArg(CGF, VAList, Ty,
-                            classifyArgumentType(Ty).isIndirect(), TI, SlotSize,
-                            /*AllowHigherAlign=*/true);
-  }
-
-  const unsigned OverflowLimit = 8;
-  if (const ComplexType *CTy = Ty->getAs<ComplexType>()) {
-    // TODO: Implement this. For now ignore.
-    (void)CTy;
-    return Address::invalid(); // FIXME?
-  }
-
-  // struct __va_list_tag {
-  //   unsigned char gpr;
-  //   unsigned char fpr;
-  //   unsigned short reserved;
-  //   void *overflow_arg_area;
-  //   void *reg_save_area;
-  // };
-
-  bool isI64 = Ty->isIntegerType() && getContext().getTypeSize(Ty) == 64;
-  bool isInt = !Ty->isFloatingType();
-  bool isF64 = Ty->isFloatingType() && getContext().getTypeSize(Ty) == 64;
-
-  // All aggregates are passed indirectly?  That doesn't seem consistent
-  // with the argument-lowering code.
-  bool isIndirect = isAggregateTypeForABI(Ty);
-
-  CGBuilderTy &Builder = CGF.Builder;
-
-  // The calling convention either uses 1-2 GPRs or 1 FPR.
-  Address NumRegsAddr = Address::invalid();
-  if (isInt || IsSoftFloatABI) {
-    NumRegsAddr = Builder.CreateStructGEP(VAList, 0, "gpr");
-  } else {
-    NumRegsAddr = Builder.CreateStructGEP(VAList, 1, "fpr");
-  }
-
-  llvm::Value *NumRegs = Builder.CreateLoad(NumRegsAddr, "numUsedRegs");
-
-  // "Align" the register count when TY is i64.
-  if (isI64 || (isF64 && IsSoftFloatABI)) {
-    NumRegs = Builder.CreateAdd(NumRegs, Builder.getInt8(1));
-    NumRegs = Builder.CreateAnd(NumRegs, Builder.getInt8((uint8_t) ~1U));
-  }
-
-  llvm::Value *CC =
-      Builder.CreateICmpULT(NumRegs, Builder.getInt8(OverflowLimit), "cond");
-
-  llvm::BasicBlock *UsingRegs = CGF.createBasicBlock("using_regs");
-  llvm::BasicBlock *UsingOverflow = CGF.createBasicBlock("using_overflow");
-  llvm::BasicBlock *Cont = CGF.createBasicBlock("cont");
-
-  Builder.CreateCondBr(CC, UsingRegs, UsingOverflow);
-
-  llvm::Type *DirectTy = CGF.ConvertType(Ty), *ElementTy = DirectTy;
-  if (isIndirect) DirectTy = DirectTy->getPointerTo(0);
-
-  // Case 1: consume registers.
-  Address RegAddr = Address::invalid();
-  {
-    CGF.EmitBlock(UsingRegs);
-
-    Address RegSaveAreaPtr = Builder.CreateStructGEP(VAList, 4);
-    RegAddr = Address(Builder.CreateLoad(RegSaveAreaPtr), CGF.Int8Ty,
-                      CharUnits::fromQuantity(8));
-    assert(RegAddr.getElementType() == CGF.Int8Ty);
-
-    // Floating-point registers start after the general-purpose registers.
-    if (!(isInt || IsSoftFloatABI)) {
-      RegAddr = Builder.CreateConstInBoundsByteGEP(RegAddr,
-                                                   CharUnits::fromQuantity(32));
-    }
-
-    // Get the address of the saved value by scaling the number of
-    // registers we've used by the number of
-    CharUnits RegSize = CharUnits::fromQuantity((isInt || IsSoftFloatABI) ? 4 : 8);
-    llvm::Value *RegOffset =
-        Builder.CreateMul(NumRegs, Builder.getInt8(RegSize.getQuantity()));
-    RegAddr = Address(
-        Builder.CreateInBoundsGEP(CGF.Int8Ty, RegAddr.getPointer(), RegOffset),
-        CGF.Int8Ty, RegAddr.getAlignment().alignmentOfArrayElement(RegSize));
-    RegAddr = Builder.CreateElementBitCast(RegAddr, DirectTy);
-
-    // Increase the used-register count.
-    NumRegs =
-      Builder.CreateAdd(NumRegs,
-                        Builder.getInt8((isI64 || (isF64 && IsSoftFloatABI)) ? 2 : 1));
-    Builder.CreateStore(NumRegs, NumRegsAddr);
-
-    CGF.EmitBranch(Cont);
-  }
-
-  // Case 2: consume space in the overflow area.
-  Address MemAddr = Address::invalid();
-  {
-    CGF.EmitBlock(UsingOverflow);
-
-    Builder.CreateStore(Builder.getInt8(OverflowLimit), NumRegsAddr);
-
-    // Everything in the overflow area is rounded up to a size of at least 4.
-    CharUnits OverflowAreaAlign = CharUnits::fromQuantity(4);
-
-    CharUnits Size;
-    if (!isIndirect) {
-      auto TypeInfo = CGF.getContext().getTypeInfoInChars(Ty);
-      Size = TypeInfo.Width.alignTo(OverflowAreaAlign);
-    } else {
-      Size = CGF.getPointerSize();
-    }
-
-    Address OverflowAreaAddr = Builder.CreateStructGEP(VAList, 3);
-    Address OverflowArea =
-        Address(Builder.CreateLoad(OverflowAreaAddr, "argp.cur"), CGF.Int8Ty,
-                OverflowAreaAlign);
-    // Round up address of argument to alignment
-    CharUnits Align = CGF.getContext().getTypeAlignInChars(Ty);
-    if (Align > OverflowAreaAlign) {
-      llvm::Value *Ptr = OverflowArea.getPointer();
-      OverflowArea = Address(emitRoundPointerUpToAlignment(CGF, Ptr, Align),
-                             OverflowArea.getElementType(), Align);
-    }
-
-    MemAddr = Builder.CreateElementBitCast(OverflowArea, DirectTy);
-
-    // Increase the overflow area.
-    OverflowArea = Builder.CreateConstInBoundsByteGEP(OverflowArea, Size);
-    Builder.CreateStore(OverflowArea.getPointer(), OverflowAreaAddr);
-    CGF.EmitBranch(Cont);
-  }
-
-  CGF.EmitBlock(Cont);
-
-  // Merge the cases with a phi.
-  Address Result = emitMergePHI(CGF, RegAddr, UsingRegs, MemAddr, UsingOverflow,
-                                "vaarg.addr");
-
-  // Load the pointer if the argument was passed indirectly.
-  if (isIndirect) {
-    Result = Address(Builder.CreateLoad(Result, "aggr"), ElementTy,
-                     getContext().getTypeAlignInChars(Ty));
-  }
-
-  return Result;
-}
-
-bool PPC32TargetCodeGenInfo::isStructReturnInRegABI(
-    const llvm::Triple &Triple, const CodeGenOptions &Opts) {
-  assert(Triple.isPPC32());
-
-  switch (Opts.getStructReturnConvention()) {
-  case CodeGenOptions::SRCK_Default:
-    break;
-  case CodeGenOptions::SRCK_OnStack: // -maix-struct-return
-    return false;
-  case CodeGenOptions::SRCK_InRegs: // -msvr4-struct-return
-    return true;
-  }
-
-  if (Triple.isOSBinFormatELF() && !Triple.isOSLinux())
-    return true;
-
-  return false;
-}
-
-bool
-PPC32TargetCodeGenInfo::initDwarfEHRegSizeTable(CodeGen::CodeGenFunction &CGF,
-                                                llvm::Value *Address) const {
-  return PPC_initDwarfEHRegSizeTable(CGF, Address, /*Is64Bit*/ false,
-                                     /*IsAIX*/ false);
-}
-
-// PowerPC-64
-
-namespace {
-enum class PPC64_SVR4_ABIKind {
-  ELFv1 = 0,
-  ELFv2,
-};
-
-/// PPC64_SVR4_ABIInfo - The 64-bit PowerPC ELF (SVR4) ABI information.
-class PPC64_SVR4_ABIInfo : public ABIInfo {
-  static const unsigned GPRBits = 64;
-  PPC64_SVR4_ABIKind Kind;
-  bool IsSoftFloatABI;
-
-public:
-  PPC64_SVR4_ABIInfo(CodeGen::CodeGenTypes &CGT, PPC64_SVR4_ABIKind Kind,
-                     bool SoftFloatABI)
-      : ABIInfo(CGT), Kind(Kind), IsSoftFloatABI(SoftFloatABI) {}
-
-  bool isPromotableTypeForABI(QualType Ty) const;
-  CharUnits getParamTypeAlignment(QualType Ty) const;
-
-  ABIArgInfo classifyReturnType(QualType RetTy) const;
-  ABIArgInfo classifyArgumentType(QualType Ty) const;
-
-  bool isHomogeneousAggregateBaseType(QualType Ty) const override;
-  bool isHomogeneousAggregateSmallEnough(const Type *Ty,
-                                         uint64_t Members) const override;
-
-  // TODO: We can add more logic to computeInfo to improve performance.
-  // Example: For aggregate arguments that fit in a register, we could
-  // use getDirectInReg (as is done below for structs containing a single
-  // floating-point value) to avoid pushing them to memory on function
-  // entry.  This would require changing the logic in PPCISelLowering
-  // when lowering the parameters in the caller and args in the callee.
-  void computeInfo(CGFunctionInfo &FI) const override {
-    if (!getCXXABI().classifyReturnType(FI))
-      FI.getReturnInfo() = classifyReturnType(FI.getReturnType());
-    for (auto &I : FI.arguments()) {
-      // We rely on the default argument classification for the most part.
-      // One exception:  An aggregate containing a single floating-point
-      // or vector item must be passed in a register if one is available.
-      const Type *T = isSingleElementStruct(I.type, getContext());
-      if (T) {
-        const BuiltinType *BT = T->getAs<BuiltinType>();
-        if ((T->isVectorType() && getContext().getTypeSize(T) == 128) ||
-            (BT && BT->isFloatingPoint())) {
-          QualType QT(T, 0);
-          I.info = ABIArgInfo::getDirectInReg(CGT.ConvertType(QT));
-          continue;
-        }
-      }
-      I.info = classifyArgumentType(I.type);
-    }
-  }
-
-  Address EmitVAArg(CodeGenFunction &CGF, Address VAListAddr,
-                    QualType Ty) const override;
-};
-
-class PPC64_SVR4_TargetCodeGenInfo : public TargetCodeGenInfo {
-
-public:
-  PPC64_SVR4_TargetCodeGenInfo(CodeGenTypes &CGT, PPC64_SVR4_ABIKind Kind,
-                               bool SoftFloatABI)
-      : TargetCodeGenInfo(
-            std::make_unique<PPC64_SVR4_ABIInfo>(CGT, Kind, SoftFloatABI)) {
-    SwiftInfo =
-        std::make_unique<SwiftABIInfo>(CGT, /*SwiftErrorInRegister=*/false);
-  }
-
-  int getDwarfEHStackPointer(CodeGen::CodeGenModule &M) const override {
-    // This is recovered from gcc output.
-    return 1; // r1 is the dedicated stack pointer
-  }
-
-  bool initDwarfEHRegSizeTable(CodeGen::CodeGenFunction &CGF,
-                               llvm::Value *Address) const override;
-};
-
-class PPC64TargetCodeGenInfo : public TargetCodeGenInfo {
-public:
-  PPC64TargetCodeGenInfo(CodeGenTypes &CGT)
-      : TargetCodeGenInfo(std::make_unique<DefaultABIInfo>(CGT)) {}
-
-  int getDwarfEHStackPointer(CodeGen::CodeGenModule &M) const override {
-    // This is recovered from gcc output.
-    return 1; // r1 is the dedicated stack pointer
-  }
-
-  bool initDwarfEHRegSizeTable(CodeGen::CodeGenFunction &CGF,
-                               llvm::Value *Address) const override;
-};
-}
-
-// Return true if the ABI requires Ty to be passed sign- or zero-
-// extended to 64 bits.
-bool
-PPC64_SVR4_ABIInfo::isPromotableTypeForABI(QualType Ty) const {
-  // Treat an enum type as its underlying type.
-  if (const EnumType *EnumTy = Ty->getAs<EnumType>())
-    Ty = EnumTy->getDecl()->getIntegerType();
-
-  // Promotable integer types are required to be promoted by the ABI.
-  if (isPromotableIntegerTypeForABI(Ty))
-    return true;
-
-  // In addition to the usual promotable integer types, we also need to
-  // extend all 32-bit types, since the ABI requires promotion to 64 bits.
-  if (const BuiltinType *BT = Ty->getAs<BuiltinType>())
-    switch (BT->getKind()) {
-    case BuiltinType::Int:
-    case BuiltinType::UInt:
-      return true;
-    default:
-      break;
-    }
-
-  if (const auto *EIT = Ty->getAs<BitIntType>())
-    if (EIT->getNumBits() < 64)
-      return true;
-
-  return false;
-}
-
-/// isAlignedParamType - Determine whether a type requires 16-byte or
-/// higher alignment in the parameter area.  Always returns at least 8.
-CharUnits PPC64_SVR4_ABIInfo::getParamTypeAlignment(QualType Ty) const {
-  // Complex types are passed just like their elements.
-  if (const ComplexType *CTy = Ty->getAs<ComplexType>())
-    Ty = CTy->getElementType();
-
-  auto FloatUsesVector = [this](QualType Ty){
-    return Ty->isRealFloatingType() && &getContext().getFloatTypeSemantics(
-                                           Ty) == &llvm::APFloat::IEEEquad();
-  };
-
-  // Only vector types of size 16 bytes need alignment (larger types are
-  // passed via reference, smaller types are not aligned).
-  if (Ty->isVectorType()) {
-    return CharUnits::fromQuantity(getContext().getTypeSize(Ty) == 128 ? 16 : 8);
-  } else if (FloatUsesVector(Ty)) {
-    // According to ABI document section 'Optional Save Areas': If extended
-    // precision floating-point values in IEEE BINARY 128 QUADRUPLE PRECISION
-    // format are supported, map them to a single quadword, quadword aligned.
-    return CharUnits::fromQuantity(16);
-  }
-
-  // For single-element float/vector structs, we consider the whole type
-  // to have the same alignment requirements as its single element.
-  const Type *AlignAsType = nullptr;
-  const Type *EltType = isSingleElementStruct(Ty, getContext());
-  if (EltType) {
-    const BuiltinType *BT = EltType->getAs<BuiltinType>();
-    if ((EltType->isVectorType() && getContext().getTypeSize(EltType) == 128) ||
-        (BT && BT->isFloatingPoint()))
-      AlignAsType = EltType;
-  }
-
-  // Likewise for ELFv2 homogeneous aggregates.
-  const Type *Base = nullptr;
-  uint64_t Members = 0;
-  if (!AlignAsType && Kind == PPC64_SVR4_ABIKind::ELFv2 &&
-      isAggregateTypeForABI(Ty) && isHomogeneousAggregate(Ty, Base, Members))
-    AlignAsType = Base;
-
-  // With special case aggregates, only vector base types need alignment.
-  if (AlignAsType) {
-    bool UsesVector = AlignAsType->isVectorType() ||
-                      FloatUsesVector(QualType(AlignAsType, 0));
-    return CharUnits::fromQuantity(UsesVector ? 16 : 8);
-  }
-
-  // Otherwise, we only need alignment for any aggregate type that
-  // has an alignment requirement of >= 16 bytes.
-  if (isAggregateTypeForABI(Ty) && getContext().getTypeAlign(Ty) >= 128) {
-    return CharUnits::fromQuantity(16);
-  }
-
-  return CharUnits::fromQuantity(8);
-}
-
-/// isHomogeneousAggregate - Return true if a type is an ELFv2 homogeneous
-/// aggregate.  Base is set to the base element type, and Members is set
-/// to the number of base elements.
-bool ABIInfo::isHomogeneousAggregate(QualType Ty, const Type *&Base,
-                                     uint64_t &Members) const {
-  if (const ConstantArrayType *AT = getContext().getAsConstantArrayType(Ty)) {
-    uint64_t NElements = AT->getSize().getZExtValue();
-    if (NElements == 0)
-      return false;
-    if (!isHomogeneousAggregate(AT->getElementType(), Base, Members))
-      return false;
-    Members *= NElements;
-  } else if (const RecordType *RT = Ty->getAs<RecordType>()) {
-    const RecordDecl *RD = RT->getDecl();
-    if (RD->hasFlexibleArrayMember())
-      return false;
-
-    Members = 0;
-
-    // If this is a C++ record, check the properties of the record such as
-    // bases and ABI specific restrictions
-    if (const CXXRecordDecl *CXXRD = dyn_cast<CXXRecordDecl>(RD)) {
-      if (!getCXXABI().isPermittedToBeHomogeneousAggregate(CXXRD))
-        return false;
-
-      for (const auto &I : CXXRD->bases()) {
-        // Ignore empty records.
-        if (isEmptyRecord(getContext(), I.getType(), true))
-          continue;
-
-        uint64_t FldMembers;
-        if (!isHomogeneousAggregate(I.getType(), Base, FldMembers))
-          return false;
-
-        Members += FldMembers;
-      }
-    }
-
-    for (const auto *FD : RD->fields()) {
-      // Ignore (non-zero arrays of) empty records.
-      QualType FT = FD->getType();
-      while (const ConstantArrayType *AT =
-             getContext().getAsConstantArrayType(FT)) {
-        if (AT->getSize().getZExtValue() == 0)
-          return false;
-        FT = AT->getElementType();
-      }
-      if (isEmptyRecord(getContext(), FT, true))
-        continue;
-
-      if (isZeroLengthBitfieldPermittedInHomogeneousAggregate() &&
-          FD->isZeroLengthBitField(getContext()))
-        continue;
-
-      uint64_t FldMembers;
-      if (!isHomogeneousAggregate(FD->getType(), Base, FldMembers))
-        return false;
-
-      Members = (RD->isUnion() ?
-                 std::max(Members, FldMembers) : Members + FldMembers);
-    }
-
-    if (!Base)
-      return false;
-
-    // Ensure there is no padding.
-    if (getContext().getTypeSize(Base) * Members !=
-        getContext().getTypeSize(Ty))
-      return false;
-  } else {
-    Members = 1;
-    if (const ComplexType *CT = Ty->getAs<ComplexType>()) {
-      Members = 2;
-      Ty = CT->getElementType();
-    }
-
-    // Most ABIs only support float, double, and some vector type widths.
-    if (!isHomogeneousAggregateBaseType(Ty))
-      return false;
-
-    // The base type must be the same for all members.  Types that
-    // agree in both total size and mode (float vs. vector) are
-    // treated as being equivalent here.
-    const Type *TyPtr = Ty.getTypePtr();
-    if (!Base) {
-      Base = TyPtr;
-      // If it's a non-power-of-2 vector, its size is already a power-of-2,
-      // so make sure to widen it explicitly.
-      if (const VectorType *VT = Base->getAs<VectorType>()) {
-        QualType EltTy = VT->getElementType();
-        unsigned NumElements =
-            getContext().getTypeSize(VT) / getContext().getTypeSize(EltTy);
-        Base = getContext()
-                   .getVectorType(EltTy, NumElements, VT->getVectorKind())
-                   .getTypePtr();
-      }
-    }
-
-    if (Base->isVectorType() != TyPtr->isVectorType() ||
-        getContext().getTypeSize(Base) != getContext().getTypeSize(TyPtr))
-      return false;
-  }
-  return Members > 0 && isHomogeneousAggregateSmallEnough(Base, Members);
-}
-
-bool PPC64_SVR4_ABIInfo::isHomogeneousAggregateBaseType(QualType Ty) const {
-  // Homogeneous aggregates for ELFv2 must have base types of float,
-  // double, long double, or 128-bit vectors.
-  if (const BuiltinType *BT = Ty->getAs<BuiltinType>()) {
-    if (BT->getKind() == BuiltinType::Float ||
-        BT->getKind() == BuiltinType::Double ||
-        BT->getKind() == BuiltinType::LongDouble ||
-        BT->getKind() == BuiltinType::Ibm128 ||
-        (getContext().getTargetInfo().hasFloat128Type() &&
-         (BT->getKind() == BuiltinType::Float128))) {
-      if (IsSoftFloatABI)
-        return false;
-      return true;
-    }
-  }
-  if (const VectorType *VT = Ty->getAs<VectorType>()) {
-    if (getContext().getTypeSize(VT) == 128)
-      return true;
-  }
-  return false;
-}
-
-bool PPC64_SVR4_ABIInfo::isHomogeneousAggregateSmallEnough(
-    const Type *Base, uint64_t Members) const {
-  // Vector and fp128 types require one register, other floating point types
-  // require one or two registers depending on their size.
-  uint32_t NumRegs =
-      ((getContext().getTargetInfo().hasFloat128Type() &&
-          Base->isFloat128Type()) ||
-        Base->isVectorType()) ? 1
-                              : (getContext().getTypeSize(Base) + 63) / 64;
-
-  // Homogeneous Aggregates may occupy at most 8 registers.
-  return Members * NumRegs <= 8;
-}
-
-ABIArgInfo
-PPC64_SVR4_ABIInfo::classifyArgumentType(QualType Ty) const {
-  Ty = useFirstFieldIfTransparentUnion(Ty);
-
-  if (Ty->isAnyComplexType())
-    return ABIArgInfo::getDirect();
-
-  // Non-Altivec vector types are passed in GPRs (smaller than 16 bytes)
-  // or via reference (larger than 16 bytes).
-  if (Ty->isVectorType()) {
-    uint64_t Size = getContext().getTypeSize(Ty);
-    if (Size > 128)
-      return getNaturalAlignIndirect(Ty, /*ByVal=*/false);
-    else if (Size < 128) {
-      llvm::Type *CoerceTy = llvm::IntegerType::get(getVMContext(), Size);
-      return ABIArgInfo::getDirect(CoerceTy);
-    }
-  }
-
-  if (const auto *EIT = Ty->getAs<BitIntType>())
-    if (EIT->getNumBits() > 128)
-      return getNaturalAlignIndirect(Ty, /*ByVal=*/true);
-
-  if (isAggregateTypeForABI(Ty)) {
-    if (CGCXXABI::RecordArgABI RAA = getRecordArgABI(Ty, getCXXABI()))
-      return getNaturalAlignIndirect(Ty, RAA == CGCXXABI::RAA_DirectInMemory);
-
-    uint64_t ABIAlign = getParamTypeAlignment(Ty).getQuantity();
-    uint64_t TyAlign = getContext().getTypeAlignInChars(Ty).getQuantity();
-
-    // ELFv2 homogeneous aggregates are passed as array types.
-    const Type *Base = nullptr;
-    uint64_t Members = 0;
-    if (Kind == PPC64_SVR4_ABIKind::ELFv2 &&
-        isHomogeneousAggregate(Ty, Base, Members)) {
-      llvm::Type *BaseTy = CGT.ConvertType(QualType(Base, 0));
-      llvm::Type *CoerceTy = llvm::ArrayType::get(BaseTy, Members);
-      return ABIArgInfo::getDirect(CoerceTy);
-    }
-
-    // If an aggregate may end up fully in registers, we do not
-    // use the ByVal method, but pass the aggregate as array.
-    // This is usually beneficial since we avoid forcing the
-    // back-end to store the argument to memory.
-    uint64_t Bits = getContext().getTypeSize(Ty);
-    if (Bits > 0 && Bits <= 8 * GPRBits) {
-      llvm::Type *CoerceTy;
-
-      // Types up to 8 bytes are passed as integer type (which will be
-      // properly aligned in the argument save area doubleword).
-      if (Bits <= GPRBits)
-        CoerceTy =
-            llvm::IntegerType::get(getVMContext(), llvm::alignTo(Bits, 8));
-      // Larger types are passed as arrays, with the base type selected
-      // according to the required alignment in the save area.
-      else {
-        uint64_t RegBits = ABIAlign * 8;
-        uint64_t NumRegs = llvm::alignTo(Bits, RegBits) / RegBits;
-        llvm::Type *RegTy = llvm::IntegerType::get(getVMContext(), RegBits);
-        CoerceTy = llvm::ArrayType::get(RegTy, NumRegs);
-      }
-
-      return ABIArgInfo::getDirect(CoerceTy);
-    }
-
-    // All other aggregates are passed ByVal.
-    return ABIArgInfo::getIndirect(CharUnits::fromQuantity(ABIAlign),
-                                   /*ByVal=*/true,
-                                   /*Realign=*/TyAlign > ABIAlign);
-  }
-
-  return (isPromotableTypeForABI(Ty) ? ABIArgInfo::getExtend(Ty)
-                                     : ABIArgInfo::getDirect());
-}
-
-ABIArgInfo
-PPC64_SVR4_ABIInfo::classifyReturnType(QualType RetTy) const {
-  if (RetTy->isVoidType())
-    return ABIArgInfo::getIgnore();
-
-  if (RetTy->isAnyComplexType())
-    return ABIArgInfo::getDirect();
-
-  // Non-Altivec vector types are returned in GPRs (smaller than 16 bytes)
-  // or via reference (larger than 16 bytes).
-  if (RetTy->isVectorType()) {
-    uint64_t Size = getContext().getTypeSize(RetTy);
-    if (Size > 128)
-      return getNaturalAlignIndirect(RetTy);
-    else if (Size < 128) {
-      llvm::Type *CoerceTy = llvm::IntegerType::get(getVMContext(), Size);
-      return ABIArgInfo::getDirect(CoerceTy);
-    }
-  }
-
-  if (const auto *EIT = RetTy->getAs<BitIntType>())
-    if (EIT->getNumBits() > 128)
-      return getNaturalAlignIndirect(RetTy, /*ByVal=*/false);
-
-  if (isAggregateTypeForABI(RetTy)) {
-    // ELFv2 homogeneous aggregates are returned as array types.
-    const Type *Base = nullptr;
-    uint64_t Members = 0;
-    if (Kind == PPC64_SVR4_ABIKind::ELFv2 &&
-        isHomogeneousAggregate(RetTy, Base, Members)) {
-      llvm::Type *BaseTy = CGT.ConvertType(QualType(Base, 0));
-      llvm::Type *CoerceTy = llvm::ArrayType::get(BaseTy, Members);
-      return ABIArgInfo::getDirect(CoerceTy);
-    }
-
-    // ELFv2 small aggregates are returned in up to two registers.
-    uint64_t Bits = getContext().getTypeSize(RetTy);
-    if (Kind == PPC64_SVR4_ABIKind::ELFv2 && Bits <= 2 * GPRBits) {
-      if (Bits == 0)
-        return ABIArgInfo::getIgnore();
-
-      llvm::Type *CoerceTy;
-      if (Bits > GPRBits) {
-        CoerceTy = llvm::IntegerType::get(getVMContext(), GPRBits);
-        CoerceTy = llvm::StructType::get(CoerceTy, CoerceTy);
-      } else
-        CoerceTy =
-            llvm::IntegerType::get(getVMContext(), llvm::alignTo(Bits, 8));
-      return ABIArgInfo::getDirect(CoerceTy);
-    }
-
-    // All other aggregates are returned indirectly.
-    return getNaturalAlignIndirect(RetTy);
-  }
-
-  return (isPromotableTypeForABI(RetTy) ? ABIArgInfo::getExtend(RetTy)
-                                        : ABIArgInfo::getDirect());
-}
-
-// Based on ARMABIInfo::EmitVAArg, adjusted for 64-bit machine.
-Address PPC64_SVR4_ABIInfo::EmitVAArg(CodeGenFunction &CGF, Address VAListAddr,
-                                      QualType Ty) const {
-  auto TypeInfo = getContext().getTypeInfoInChars(Ty);
-  TypeInfo.Align = getParamTypeAlignment(Ty);
-
-  CharUnits SlotSize = CharUnits::fromQuantity(8);
-
-  // If we have a complex type and the base type is smaller than 8 bytes,
-  // the ABI calls for the real and imaginary parts to be right-adjusted
-  // in separate doublewords.  However, Clang expects us to produce a
-  // pointer to a structure with the two parts packed tightly.  So generate
-  // loads of the real and imaginary parts relative to the va_list pointer,
-  // and store them to a temporary structure.
-  if (const ComplexType *CTy = Ty->getAs<ComplexType>()) {
-    CharUnits EltSize = TypeInfo.Width / 2;
-    if (EltSize < SlotSize)
-      return complexTempStructure(CGF, VAListAddr, Ty, SlotSize, EltSize, CTy);
-  }
-
-  // Otherwise, just use the general rule.
-  //
-  // The PPC64 ABI passes some arguments in integer registers, even to variadic
-  // functions. To allow va_list to use the simple "void*" representation,
-  // variadic calls allocate space in the argument area for the integer argument
-  // registers, and variadic functions spill their integer argument registers to
-  // this area in their prologues. When aggregates smaller than a register are
-  // passed this way, they are passed in the least significant bits of the
-  // register, which means that after spilling on big-endian targets they will
-  // be right-aligned in their argument slot. This is uncommon; for a variety of
-  // reasons, other big-endian targets don't end up right-aligning aggregate
-  // types this way, and so right-alignment only applies to fundamental types.
-  // So on PPC64, we must force the use of right-alignment even for aggregates.
-  return emitVoidPtrVAArg(CGF, VAListAddr, Ty, /*Indirect*/ false, TypeInfo,
-                          SlotSize, /*AllowHigher*/ true,
-                          /*ForceRightAdjust*/ true);
-}
-
-bool
-PPC64_SVR4_TargetCodeGenInfo::initDwarfEHRegSizeTable(
-  CodeGen::CodeGenFunction &CGF,
-  llvm::Value *Address) const {
-  return PPC_initDwarfEHRegSizeTable(CGF, Address, /*Is64Bit*/ true,
-                                     /*IsAIX*/ false);
-}
-
-bool
-PPC64TargetCodeGenInfo::initDwarfEHRegSizeTable(CodeGen::CodeGenFunction &CGF,
-                                                llvm::Value *Address) const {
-  return PPC_initDwarfEHRegSizeTable(CGF, Address, /*Is64Bit*/ true,
-                                     /*IsAIX*/ false);
-}
-
-//===----------------------------------------------------------------------===//
-// AArch64 ABI Implementation
-//===----------------------------------------------------------------------===//
-
-namespace {
-
-enum class AArch64ABIKind {
-  AAPCS = 0,
-  DarwinPCS,
-  Win64,
-};
-
-class AArch64ABIInfo : public ABIInfo {
-  AArch64ABIKind Kind;
-
-public:
-  AArch64ABIInfo(CodeGenTypes &CGT, AArch64ABIKind Kind)
-      : ABIInfo(CGT), Kind(Kind) {}
-
-private:
-  AArch64ABIKind getABIKind() const { return Kind; }
-  bool isDarwinPCS() const { return Kind == AArch64ABIKind::DarwinPCS; }
-
-  ABIArgInfo classifyReturnType(QualType RetTy, bool IsVariadic) const;
-  ABIArgInfo classifyArgumentType(QualType RetTy, bool IsVariadic,
-                                  unsigned CallingConvention) const;
-  ABIArgInfo coerceIllegalVector(QualType Ty) const;
-  bool isHomogeneousAggregateBaseType(QualType Ty) const override;
-  bool isHomogeneousAggregateSmallEnough(const Type *Ty,
-                                         uint64_t Members) const override;
-  bool isZeroLengthBitfieldPermittedInHomogeneousAggregate() const override;
-
-  bool isIllegalVectorType(QualType Ty) const;
-
-  void computeInfo(CGFunctionInfo &FI) const override {
-    if (!::classifyReturnType(getCXXABI(), FI, *this))
-      FI.getReturnInfo() =
-          classifyReturnType(FI.getReturnType(), FI.isVariadic());
-
-    for (auto &it : FI.arguments())
-      it.info = classifyArgumentType(it.type, FI.isVariadic(),
-                                     FI.getCallingConvention());
-  }
-
-  Address EmitDarwinVAArg(Address VAListAddr, QualType Ty,
-                          CodeGenFunction &CGF) const;
-
-  Address EmitAAPCSVAArg(Address VAListAddr, QualType Ty,
-                         CodeGenFunction &CGF) const;
-
-  Address EmitVAArg(CodeGenFunction &CGF, Address VAListAddr,
-                    QualType Ty) const override {
-    llvm::Type *BaseTy = CGF.ConvertType(Ty);
-    if (isa<llvm::ScalableVectorType>(BaseTy))
-      llvm::report_fatal_error("Passing SVE types to variadic functions is "
-                               "currently not supported");
-
-    return Kind == AArch64ABIKind::Win64 ? EmitMSVAArg(CGF, VAListAddr, Ty)
-           : isDarwinPCS()               ? EmitDarwinVAArg(VAListAddr, Ty, CGF)
-                                         : EmitAAPCSVAArg(VAListAddr, Ty, CGF);
-  }
-
-  Address EmitMSVAArg(CodeGenFunction &CGF, Address VAListAddr,
-                      QualType Ty) const override;
-
-  bool allowBFloatArgsAndRet() const override {
-    return getTarget().hasBFloat16Type();
-  }
-};
-
-class AArch64SwiftABIInfo : public SwiftABIInfo {
-public:
-  explicit AArch64SwiftABIInfo(CodeGenTypes &CGT)
-      : SwiftABIInfo(CGT, /*SwiftErrorInRegister=*/true) {}
-
-  bool isLegalVectorType(CharUnits VectorSize, llvm::Type *EltTy,
-                         unsigned NumElts) const override;
-};
-
-class AArch64TargetCodeGenInfo : public TargetCodeGenInfo {
-public:
-  AArch64TargetCodeGenInfo(CodeGenTypes &CGT, AArch64ABIKind Kind)
-      : TargetCodeGenInfo(std::make_unique<AArch64ABIInfo>(CGT, Kind)) {
-    SwiftInfo = std::make_unique<AArch64SwiftABIInfo>(CGT);
-  }
-
-  StringRef getARCRetainAutoreleasedReturnValueMarker() const override {
-    return "mov\tfp, fp\t\t// marker for objc_retainAutoreleaseReturnValue";
-  }
-
-  int getDwarfEHStackPointer(CodeGen::CodeGenModule &M) const override {
-    return 31;
-  }
-
-  bool doesReturnSlotInterfereWithArgs() const override { return false; }
-
-  void setTargetAttributes(const Decl *D, llvm::GlobalValue *GV,
-                           CodeGen::CodeGenModule &CGM) const override {
-    const FunctionDecl *FD = dyn_cast_or_null<FunctionDecl>(D);
-    if (!FD)
-      return;
-
-    const auto *TA = FD->getAttr<TargetAttr>();
-    if (TA == nullptr)
-      return;
-
-    ParsedTargetAttr Attr =
-        CGM.getTarget().parseTargetAttr(TA->getFeaturesStr());
-    if (Attr.BranchProtection.empty())
-      return;
-
-    TargetInfo::BranchProtectionInfo BPI;
-    StringRef Error;
-    (void)CGM.getTarget().validateBranchProtection(Attr.BranchProtection,
-                                                   Attr.CPU, BPI, Error);
-    assert(Error.empty());
-
-    auto *Fn = cast<llvm::Function>(GV);
-    static const char *SignReturnAddrStr[] = {"none", "non-leaf", "all"};
-    Fn->addFnAttr("sign-return-address", SignReturnAddrStr[static_cast<int>(BPI.SignReturnAddr)]);
-
-    if (BPI.SignReturnAddr != LangOptions::SignReturnAddressScopeKind::None) {
-      Fn->addFnAttr("sign-return-address-key",
-                    BPI.SignKey == LangOptions::SignReturnAddressKeyKind::AKey
-                        ? "a_key"
-                        : "b_key");
-    }
-
-    Fn->addFnAttr("branch-target-enforcement",
-                  BPI.BranchTargetEnforcement ? "true" : "false");
-  }
-
-  bool isScalarizableAsmOperand(CodeGen::CodeGenFunction &CGF,
-                                llvm::Type *Ty) const override {
-    if (CGF.getTarget().hasFeature("ls64")) {
-      auto *ST = dyn_cast<llvm::StructType>(Ty);
-      if (ST && ST->getNumElements() == 1) {
-        auto *AT = dyn_cast<llvm::ArrayType>(ST->getElementType(0));
-        if (AT && AT->getNumElements() == 8 &&
-            AT->getElementType()->isIntegerTy(64))
-          return true;
-      }
-    }
-    return TargetCodeGenInfo::isScalarizableAsmOperand(CGF, Ty);
-  }
-};
-
-class WindowsAArch64TargetCodeGenInfo : public AArch64TargetCodeGenInfo {
-public:
-  WindowsAArch64TargetCodeGenInfo(CodeGenTypes &CGT, AArch64ABIKind K)
-      : AArch64TargetCodeGenInfo(CGT, K) {}
-
-  void setTargetAttributes(const Decl *D, llvm::GlobalValue *GV,
-                           CodeGen::CodeGenModule &CGM) const override;
-
-  void getDependentLibraryOption(llvm::StringRef Lib,
-                                 llvm::SmallString<24> &Opt) const override {
-    Opt = "/DEFAULTLIB:" + qualifyWindowsLibrary(Lib);
-  }
-
-  void getDetectMismatchOption(llvm::StringRef Name, llvm::StringRef Value,
-                               llvm::SmallString<32> &Opt) const override {
-    Opt = "/FAILIFMISMATCH:\"" + Name.str() + "=" + Value.str() + "\"";
-  }
-};
-
-void WindowsAArch64TargetCodeGenInfo::setTargetAttributes(
-    const Decl *D, llvm::GlobalValue *GV, CodeGen::CodeGenModule &CGM) const {
-  AArch64TargetCodeGenInfo::setTargetAttributes(D, GV, CGM);
-  if (GV->isDeclaration())
-    return;
-  addStackProbeTargetAttributes(D, GV, CGM);
-}
-}
-
-ABIArgInfo AArch64ABIInfo::coerceIllegalVector(QualType Ty) const {
-  assert(Ty->isVectorType() && "expected vector type!");
-
-  const auto *VT = Ty->castAs<VectorType>();
-  if (VT->getVectorKind() == VectorType::SveFixedLengthPredicateVector) {
-    assert(VT->getElementType()->isBuiltinType() && "expected builtin type!");
-    assert(VT->getElementType()->castAs<BuiltinType>()->getKind() ==
-               BuiltinType::UChar &&
-           "unexpected builtin type for SVE predicate!");
-    return ABIArgInfo::getDirect(llvm::ScalableVectorType::get(
-        llvm::Type::getInt1Ty(getVMContext()), 16));
-  }
-
-  if (VT->getVectorKind() == VectorType::SveFixedLengthDataVector) {
-    assert(VT->getElementType()->isBuiltinType() && "expected builtin type!");
-
-    const auto *BT = VT->getElementType()->castAs<BuiltinType>();
-    llvm::ScalableVectorType *ResType = nullptr;
-    switch (BT->getKind()) {
-    default:
-      llvm_unreachable("unexpected builtin type for SVE vector!");
-    case BuiltinType::SChar:
-    case BuiltinType::UChar:
-      ResType = llvm::ScalableVectorType::get(
-          llvm::Type::getInt8Ty(getVMContext()), 16);
-      break;
-    case BuiltinType::Short:
-    case BuiltinType::UShort:
-      ResType = llvm::ScalableVectorType::get(
-          llvm::Type::getInt16Ty(getVMContext()), 8);
-      break;
-    case BuiltinType::Int:
-    case BuiltinType::UInt:
-      ResType = llvm::ScalableVectorType::get(
-          llvm::Type::getInt32Ty(getVMContext()), 4);
-      break;
-    case BuiltinType::Long:
-    case BuiltinType::ULong:
-      ResType = llvm::ScalableVectorType::get(
-          llvm::Type::getInt64Ty(getVMContext()), 2);
-      break;
-    case BuiltinType::Half:
-      ResType = llvm::ScalableVectorType::get(
-          llvm::Type::getHalfTy(getVMContext()), 8);
-      break;
-    case BuiltinType::Float:
-      ResType = llvm::ScalableVectorType::get(
-          llvm::Type::getFloatTy(getVMContext()), 4);
-      break;
-    case BuiltinType::Double:
-      ResType = llvm::ScalableVectorType::get(
-          llvm::Type::getDoubleTy(getVMContext()), 2);
-      break;
-    case BuiltinType::BFloat16:
-      ResType = llvm::ScalableVectorType::get(
-          llvm::Type::getBFloatTy(getVMContext()), 8);
-      break;
-    }
-    return ABIArgInfo::getDirect(ResType);
-  }
-
-  uint64_t Size = getContext().getTypeSize(Ty);
-  // Android promotes <2 x i8> to i16, not i32
-  if ((isAndroid() || isOHOSFamily()) && (Size <= 16)) {
-    llvm::Type *ResType = llvm::Type::getInt16Ty(getVMContext());
-    return ABIArgInfo::getDirect(ResType);
-  }
-  if (Size <= 32) {
-    llvm::Type *ResType = llvm::Type::getInt32Ty(getVMContext());
-    return ABIArgInfo::getDirect(ResType);
-  }
-  if (Size == 64) {
-    auto *ResType =
-        llvm::FixedVectorType::get(llvm::Type::getInt32Ty(getVMContext()), 2);
-    return ABIArgInfo::getDirect(ResType);
-  }
-  if (Size == 128) {
-    auto *ResType =
-        llvm::FixedVectorType::get(llvm::Type::getInt32Ty(getVMContext()), 4);
-    return ABIArgInfo::getDirect(ResType);
-  }
-  return getNaturalAlignIndirect(Ty, /*ByVal=*/false);
-}
-
-ABIArgInfo
-AArch64ABIInfo::classifyArgumentType(QualType Ty, bool IsVariadic,
-                                     unsigned CallingConvention) const {
-  Ty = useFirstFieldIfTransparentUnion(Ty);
-
-  // Handle illegal vector types here.
-  if (isIllegalVectorType(Ty))
-    return coerceIllegalVector(Ty);
-
-  if (!isAggregateTypeForABI(Ty)) {
-    // Treat an enum type as its underlying type.
-    if (const EnumType *EnumTy = Ty->getAs<EnumType>())
-      Ty = EnumTy->getDecl()->getIntegerType();
-
-    if (const auto *EIT = Ty->getAs<BitIntType>())
-      if (EIT->getNumBits() > 128)
-        return getNaturalAlignIndirect(Ty);
-
-    return (isPromotableIntegerTypeForABI(Ty) && isDarwinPCS()
-                ? ABIArgInfo::getExtend(Ty)
-                : ABIArgInfo::getDirect());
-  }
-
-  // Structures with either a non-trivial destructor or a non-trivial
-  // copy constructor are always indirect.
-  if (CGCXXABI::RecordArgABI RAA = getRecordArgABI(Ty, getCXXABI())) {
-    return getNaturalAlignIndirect(Ty, /*ByVal=*/RAA ==
-                                     CGCXXABI::RAA_DirectInMemory);
-  }
-
-  // Empty records are always ignored on Darwin, but actually passed in C++ mode
-  // elsewhere for GNU compatibility.
-  uint64_t Size = getContext().getTypeSize(Ty);
-  bool IsEmpty = isEmptyRecord(getContext(), Ty, true);
-  if (IsEmpty || Size == 0) {
-    if (!getContext().getLangOpts().CPlusPlus || isDarwinPCS())
-      return ABIArgInfo::getIgnore();
-
-    // GNU C mode. The only argument that gets ignored is an empty one with size
-    // 0.
-    if (IsEmpty && Size == 0)
-      return ABIArgInfo::getIgnore();
-    return ABIArgInfo::getDirect(llvm::Type::getInt8Ty(getVMContext()));
-  }
-
-  // Homogeneous Floating-point Aggregates (HFAs) need to be expanded.
-  const Type *Base = nullptr;
-  uint64_t Members = 0;
-  bool IsWin64 = Kind == AArch64ABIKind::Win64 ||
-                 CallingConvention == llvm::CallingConv::Win64;
-  bool IsWinVariadic = IsWin64 && IsVariadic;
-  // In variadic functions on Windows, all composite types are treated alike,
-  // no special handling of HFAs/HVAs.
-  if (!IsWinVariadic && isHomogeneousAggregate(Ty, Base, Members)) {
-    if (Kind != AArch64ABIKind::AAPCS)
-      return ABIArgInfo::getDirect(
-          llvm::ArrayType::get(CGT.ConvertType(QualType(Base, 0)), Members));
-
-    // For alignment adjusted HFAs, cap the argument alignment to 16, leave it
-    // default otherwise.
-    unsigned Align =
-        getContext().getTypeUnadjustedAlignInChars(Ty).getQuantity();
-    unsigned BaseAlign = getContext().getTypeAlignInChars(Base).getQuantity();
-    Align = (Align > BaseAlign && Align >= 16) ? 16 : 0;
-    return ABIArgInfo::getDirect(
-        llvm::ArrayType::get(CGT.ConvertType(QualType(Base, 0)), Members), 0,
-        nullptr, true, Align);
-  }
-
-  // Aggregates <= 16 bytes are passed directly in registers or on the stack.
-  if (Size <= 128) {
-    // On RenderScript, coerce Aggregates <= 16 bytes to an integer array of
-    // same size and alignment.
-    if (getTarget().isRenderScriptTarget()) {
-      return coerceToIntArray(Ty, getContext(), getVMContext());
-    }
-    unsigned Alignment;
-    if (Kind == AArch64ABIKind::AAPCS) {
-      Alignment = getContext().getTypeUnadjustedAlign(Ty);
-      Alignment = Alignment < 128 ? 64 : 128;
-    } else {
-      Alignment =
-          std::max(getContext().getTypeAlign(Ty),
-                   (unsigned)getTarget().getPointerWidth(LangAS::Default));
-    }
-    Size = llvm::alignTo(Size, Alignment);
-
-    // We use a pair of i64 for 16-byte aggregate with 8-byte alignment.
-    // For aggregates with 16-byte alignment, we use i128.
-    llvm::Type *BaseTy = llvm::Type::getIntNTy(getVMContext(), Alignment);
-    return ABIArgInfo::getDirect(
-        Size == Alignment ? BaseTy
-                          : llvm::ArrayType::get(BaseTy, Size / Alignment));
-  }
-
-  return getNaturalAlignIndirect(Ty, /*ByVal=*/false);
-}
-
-ABIArgInfo AArch64ABIInfo::classifyReturnType(QualType RetTy,
-                                              bool IsVariadic) const {
-  if (RetTy->isVoidType())
-    return ABIArgInfo::getIgnore();
-
-  if (const auto *VT = RetTy->getAs<VectorType>()) {
-    if (VT->getVectorKind() == VectorType::SveFixedLengthDataVector ||
-        VT->getVectorKind() == VectorType::SveFixedLengthPredicateVector)
-      return coerceIllegalVector(RetTy);
-  }
-
-  // Large vector types should be returned via memory.
-  if (RetTy->isVectorType() && getContext().getTypeSize(RetTy) > 128)
-    return getNaturalAlignIndirect(RetTy);
-
-  if (!isAggregateTypeForABI(RetTy)) {
-    // Treat an enum type as its underlying type.
-    if (const EnumType *EnumTy = RetTy->getAs<EnumType>())
-      RetTy = EnumTy->getDecl()->getIntegerType();
-
-    if (const auto *EIT = RetTy->getAs<BitIntType>())
-      if (EIT->getNumBits() > 128)
-        return getNaturalAlignIndirect(RetTy);
-
-    return (isPromotableIntegerTypeForABI(RetTy) && isDarwinPCS()
-                ? ABIArgInfo::getExtend(RetTy)
-                : ABIArgInfo::getDirect());
-  }
-
-  uint64_t Size = getContext().getTypeSize(RetTy);
-  if (isEmptyRecord(getContext(), RetTy, true) || Size == 0)
-    return ABIArgInfo::getIgnore();
-
-  const Type *Base = nullptr;
-  uint64_t Members = 0;
-  if (isHomogeneousAggregate(RetTy, Base, Members) &&
-      !(getTarget().getTriple().getArch() == llvm::Triple::aarch64_32 &&
-        IsVariadic))
-    // Homogeneous Floating-point Aggregates (HFAs) are returned directly.
-    return ABIArgInfo::getDirect();
-
-  // Aggregates <= 16 bytes are returned directly in registers or on the stack.
-  if (Size <= 128) {
-    // On RenderScript, coerce Aggregates <= 16 bytes to an integer array of
-    // same size and alignment.
-    if (getTarget().isRenderScriptTarget()) {
-      return coerceToIntArray(RetTy, getContext(), getVMContext());
-    }
-
-    if (Size <= 64 && getDataLayout().isLittleEndian()) {
-      // Composite types are returned in lower bits of a 64-bit register for LE,
-      // and in higher bits for BE. However, integer types are always returned
-      // in lower bits for both LE and BE, and they are not rounded up to
-      // 64-bits. We can skip rounding up of composite types for LE, but not for
-      // BE, otherwise composite types will be indistinguishable from integer
-      // types.
-      return ABIArgInfo::getDirect(
-          llvm::IntegerType::get(getVMContext(), Size));
-    }
-
-    unsigned Alignment = getContext().getTypeAlign(RetTy);
-    Size = llvm::alignTo(Size, 64); // round up to multiple of 8 bytes
-
-    // We use a pair of i64 for 16-byte aggregate with 8-byte alignment.
-    // For aggregates with 16-byte alignment, we use i128.
-    if (Alignment < 128 && Size == 128) {
-      llvm::Type *BaseTy = llvm::Type::getInt64Ty(getVMContext());
-      return ABIArgInfo::getDirect(llvm::ArrayType::get(BaseTy, Size / 64));
-    }
-    return ABIArgInfo::getDirect(llvm::IntegerType::get(getVMContext(), Size));
-  }
-
-  return getNaturalAlignIndirect(RetTy);
-}
-
-/// isIllegalVectorType - check whether the vector type is legal for AArch64.
-bool AArch64ABIInfo::isIllegalVectorType(QualType Ty) const {
-  if (const VectorType *VT = Ty->getAs<VectorType>()) {
-    // Check whether VT is a fixed-length SVE vector. These types are
-    // represented as scalable vectors in function args/return and must be
-    // coerced from fixed vectors.
-    if (VT->getVectorKind() == VectorType::SveFixedLengthDataVector ||
-        VT->getVectorKind() == VectorType::SveFixedLengthPredicateVector)
-      return true;
-
-    // Check whether VT is legal.
-    unsigned NumElements = VT->getNumElements();
-    uint64_t Size = getContext().getTypeSize(VT);
-    // NumElements should be power of 2.
-    if (!llvm::isPowerOf2_32(NumElements))
-      return true;
-
-    // arm64_32 has to be compatible with the ARM logic here, which allows huge
-    // vectors for some reason.
-    llvm::Triple Triple = getTarget().getTriple();
-    if (Triple.getArch() == llvm::Triple::aarch64_32 &&
-        Triple.isOSBinFormatMachO())
-      return Size <= 32;
-
-    return Size != 64 && (Size != 128 || NumElements == 1);
-  }
-  return false;
-}
-
-bool AArch64SwiftABIInfo::isLegalVectorType(CharUnits VectorSize,
-                                            llvm::Type *EltTy,
-                                            unsigned NumElts) const {
-  if (!llvm::isPowerOf2_32(NumElts))
-    return false;
-  if (VectorSize.getQuantity() != 8 &&
-      (VectorSize.getQuantity() != 16 || NumElts == 1))
-    return false;
-  return true;
-}
-
-bool AArch64ABIInfo::isHomogeneousAggregateBaseType(QualType Ty) const {
-  // Homogeneous aggregates for AAPCS64 must have base types of a floating
-  // point type or a short-vector type. This is the same as the 32-bit ABI,
-  // but with the difference that any floating-point type is allowed,
-  // including __fp16.
-  if (const BuiltinType *BT = Ty->getAs<BuiltinType>()) {
-    if (BT->isFloatingPoint())
-      return true;
-  } else if (const VectorType *VT = Ty->getAs<VectorType>()) {
-    unsigned VecSize = getContext().getTypeSize(VT);
-    if (VecSize == 64 || VecSize == 128)
-      return true;
-  }
-  return false;
-}
-
-bool AArch64ABIInfo::isHomogeneousAggregateSmallEnough(const Type *Base,
-                                                       uint64_t Members) const {
-  return Members <= 4;
-}
-
-bool AArch64ABIInfo::isZeroLengthBitfieldPermittedInHomogeneousAggregate()
-    const {
-  // AAPCS64 says that the rule for whether something is a homogeneous
-  // aggregate is applied to the output of the data layout decision. So
-  // anything that doesn't affect the data layout also does not affect
-  // homogeneity. In particular, zero-length bitfields don't stop a struct
-  // being homogeneous.
-  return true;
-}
-
-Address AArch64ABIInfo::EmitAAPCSVAArg(Address VAListAddr, QualType Ty,
-                                       CodeGenFunction &CGF) const {
-  ABIArgInfo AI = classifyArgumentType(Ty, /*IsVariadic=*/true,
-                                       CGF.CurFnInfo->getCallingConvention());
-  // Empty records are ignored for parameter passing purposes.
-  if (AI.isIgnore()) {
-    uint64_t PointerSize = getTarget().getPointerWidth(LangAS::Default) / 8;
-    CharUnits SlotSize = CharUnits::fromQuantity(PointerSize);
-    VAListAddr = CGF.Builder.CreateElementBitCast(VAListAddr, CGF.Int8PtrTy);
-    auto *Load = CGF.Builder.CreateLoad(VAListAddr);
-    Address Addr = Address(Load, CGF.Int8Ty, SlotSize);
-    return CGF.Builder.CreateElementBitCast(Addr, CGF.ConvertTypeForMem(Ty));
-  }
-
-  bool IsIndirect = AI.isIndirect();
-
-  llvm::Type *BaseTy = CGF.ConvertType(Ty);
-  if (IsIndirect)
-    BaseTy = llvm::PointerType::getUnqual(BaseTy);
-  else if (AI.getCoerceToType())
-    BaseTy = AI.getCoerceToType();
-
-  unsigned NumRegs = 1;
-  if (llvm::ArrayType *ArrTy = dyn_cast<llvm::ArrayType>(BaseTy)) {
-    BaseTy = ArrTy->getElementType();
-    NumRegs = ArrTy->getNumElements();
-  }
-  bool IsFPR = BaseTy->isFloatingPointTy() || BaseTy->isVectorTy();
-
-  // The AArch64 va_list type and handling is specified in the Procedure Call
-  // Standard, section B.4:
-  //
-  // struct {
-  //   void *__stack;
-  //   void *__gr_top;
-  //   void *__vr_top;
-  //   int __gr_offs;
-  //   int __vr_offs;
-  // };
-
-  llvm::BasicBlock *MaybeRegBlock = CGF.createBasicBlock("vaarg.maybe_reg");
-  llvm::BasicBlock *InRegBlock = CGF.createBasicBlock("vaarg.in_reg");
-  llvm::BasicBlock *OnStackBlock = CGF.createBasicBlock("vaarg.on_stack");
-  llvm::BasicBlock *ContBlock = CGF.createBasicBlock("vaarg.end");
-
-  CharUnits TySize = getContext().getTypeSizeInChars(Ty);
-  CharUnits TyAlign = getContext().getTypeUnadjustedAlignInChars(Ty);
-
-  Address reg_offs_p = Address::invalid();
-  llvm::Value *reg_offs = nullptr;
-  int reg_top_index;
-  int RegSize = IsIndirect ? 8 : TySize.getQuantity();
-  if (!IsFPR) {
-    // 3 is the field number of __gr_offs
-    reg_offs_p = CGF.Builder.CreateStructGEP(VAListAddr, 3, "gr_offs_p");
-    reg_offs = CGF.Builder.CreateLoad(reg_offs_p, "gr_offs");
-    reg_top_index = 1; // field number for __gr_top
-    RegSize = llvm::alignTo(RegSize, 8);
-  } else {
-    // 4 is the field number of __vr_offs.
-    reg_offs_p = CGF.Builder.CreateStructGEP(VAListAddr, 4, "vr_offs_p");
-    reg_offs = CGF.Builder.CreateLoad(reg_offs_p, "vr_offs");
-    reg_top_index = 2; // field number for __vr_top
-    RegSize = 16 * NumRegs;
-  }
-
-  //=======================================
-  // Find out where argument was passed
-  //=======================================
-
-  // If reg_offs >= 0 we're already using the stack for this type of
-  // argument. We don't want to keep updating reg_offs (in case it overflows,
-  // though anyone passing 2GB of arguments, each at most 16 bytes, deserves
-  // whatever they get).
-  llvm::Value *UsingStack = nullptr;
-  UsingStack = CGF.Builder.CreateICmpSGE(
-      reg_offs, llvm::ConstantInt::get(CGF.Int32Ty, 0));
-
-  CGF.Builder.CreateCondBr(UsingStack, OnStackBlock, MaybeRegBlock);
-
-  // Otherwise, at least some kind of argument could go in these registers, the
-  // question is whether this particular type is too big.
-  CGF.EmitBlock(MaybeRegBlock);
-
-  // Integer arguments may need to correct register alignment (for example a
-  // "struct { __int128 a; };" gets passed in x_2N, x_{2N+1}). In this case we
-  // align __gr_offs to calculate the potential address.
-  if (!IsFPR && !IsIndirect && TyAlign.getQuantity() > 8) {
-    int Align = TyAlign.getQuantity();
-
-    reg_offs = CGF.Builder.CreateAdd(
-        reg_offs, llvm::ConstantInt::get(CGF.Int32Ty, Align - 1),
-        "align_regoffs");
-    reg_offs = CGF.Builder.CreateAnd(
-        reg_offs, llvm::ConstantInt::get(CGF.Int32Ty, -Align),
-        "aligned_regoffs");
-  }
-
-  // Update the gr_offs/vr_offs pointer for next call to va_arg on this va_list.
-  // The fact that this is done unconditionally reflects the fact that
-  // allocating an argument to the stack also uses up all the remaining
-  // registers of the appropriate kind.
-  llvm::Value *NewOffset = nullptr;
-  NewOffset = CGF.Builder.CreateAdd(
-      reg_offs, llvm::ConstantInt::get(CGF.Int32Ty, RegSize), "new_reg_offs");
-  CGF.Builder.CreateStore(NewOffset, reg_offs_p);
-
-  // Now we're in a position to decide whether this argument really was in
-  // registers or not.
-  llvm::Value *InRegs = nullptr;
-  InRegs = CGF.Builder.CreateICmpSLE(
-      NewOffset, llvm::ConstantInt::get(CGF.Int32Ty, 0), "inreg");
-
-  CGF.Builder.CreateCondBr(InRegs, InRegBlock, OnStackBlock);
-
-  //=======================================
-  // Argument was in registers
-  //=======================================
-
-  // Now we emit the code for if the argument was originally passed in
-  // registers. First start the appropriate block:
-  CGF.EmitBlock(InRegBlock);
-
-  llvm::Value *reg_top = nullptr;
-  Address reg_top_p =
-      CGF.Builder.CreateStructGEP(VAListAddr, reg_top_index, "reg_top_p");
-  reg_top = CGF.Builder.CreateLoad(reg_top_p, "reg_top");
-  Address BaseAddr(CGF.Builder.CreateInBoundsGEP(CGF.Int8Ty, reg_top, reg_offs),
-                   CGF.Int8Ty, CharUnits::fromQuantity(IsFPR ? 16 : 8));
-  Address RegAddr = Address::invalid();
-  llvm::Type *MemTy = CGF.ConvertTypeForMem(Ty), *ElementTy = MemTy;
-
-  if (IsIndirect) {
-    // If it's been passed indirectly (actually a struct), whatever we find from
-    // stored registers or on the stack will actually be a struct **.
-    MemTy = llvm::PointerType::getUnqual(MemTy);
-  }
-
-  const Type *Base = nullptr;
-  uint64_t NumMembers = 0;
-  bool IsHFA = isHomogeneousAggregate(Ty, Base, NumMembers);
-  if (IsHFA && NumMembers > 1) {
-    // Homogeneous aggregates passed in registers will have their elements split
-    // and stored 16-bytes apart regardless of size (they're notionally in qN,
-    // qN+1, ...). We reload and store into a temporary local variable
-    // contiguously.
-    assert(!IsIndirect && "Homogeneous aggregates should be passed directly");
-    auto BaseTyInfo = getContext().getTypeInfoInChars(QualType(Base, 0));
-    llvm::Type *BaseTy = CGF.ConvertType(QualType(Base, 0));
-    llvm::Type *HFATy = llvm::ArrayType::get(BaseTy, NumMembers);
-    Address Tmp = CGF.CreateTempAlloca(HFATy,
-                                       std::max(TyAlign, BaseTyInfo.Align));
-
-    // On big-endian platforms, the value will be right-aligned in its slot.
-    int Offset = 0;
-    if (CGF.CGM.getDataLayout().isBigEndian() &&
-        BaseTyInfo.Width.getQuantity() < 16)
-      Offset = 16 - BaseTyInfo.Width.getQuantity();
-
-    for (unsigned i = 0; i < NumMembers; ++i) {
-      CharUnits BaseOffset = CharUnits::fromQuantity(16 * i + Offset);
-      Address LoadAddr =
-        CGF.Builder.CreateConstInBoundsByteGEP(BaseAddr, BaseOffset);
-      LoadAddr = CGF.Builder.CreateElementBitCast(LoadAddr, BaseTy);
-
-      Address StoreAddr = CGF.Builder.CreateConstArrayGEP(Tmp, i);
-
-      llvm::Value *Elem = CGF.Builder.CreateLoad(LoadAddr);
-      CGF.Builder.CreateStore(Elem, StoreAddr);
-    }
-
-    RegAddr = CGF.Builder.CreateElementBitCast(Tmp, MemTy);
-  } else {
-    // Otherwise the object is contiguous in memory.
-
-    // It might be right-aligned in its slot.
-    CharUnits SlotSize = BaseAddr.getAlignment();
-    if (CGF.CGM.getDataLayout().isBigEndian() && !IsIndirect &&
-        (IsHFA || !isAggregateTypeForABI(Ty)) &&
-        TySize < SlotSize) {
-      CharUnits Offset = SlotSize - TySize;
-      BaseAddr = CGF.Builder.CreateConstInBoundsByteGEP(BaseAddr, Offset);
-    }
-
-    RegAddr = CGF.Builder.CreateElementBitCast(BaseAddr, MemTy);
-  }
-
-  CGF.EmitBranch(ContBlock);
-
-  //=======================================
-  // Argument was on the stack
-  //=======================================
-  CGF.EmitBlock(OnStackBlock);
-
-  Address stack_p = CGF.Builder.CreateStructGEP(VAListAddr, 0, "stack_p");
-  llvm::Value *OnStackPtr = CGF.Builder.CreateLoad(stack_p, "stack");
-
-  // Again, stack arguments may need realignment. In this case both integer and
-  // floating-point ones might be affected.
-  if (!IsIndirect && TyAlign.getQuantity() > 8) {
-    int Align = TyAlign.getQuantity();
-
-    OnStackPtr = CGF.Builder.CreatePtrToInt(OnStackPtr, CGF.Int64Ty);
-
-    OnStackPtr = CGF.Builder.CreateAdd(
-        OnStackPtr, llvm::ConstantInt::get(CGF.Int64Ty, Align - 1),
-        "align_stack");
-    OnStackPtr = CGF.Builder.CreateAnd(
-        OnStackPtr, llvm::ConstantInt::get(CGF.Int64Ty, -Align),
-        "align_stack");
-
-    OnStackPtr = CGF.Builder.CreateIntToPtr(OnStackPtr, CGF.Int8PtrTy);
-  }
-  Address OnStackAddr = Address(OnStackPtr, CGF.Int8Ty,
-                                std::max(CharUnits::fromQuantity(8), TyAlign));
-
-  // All stack slots are multiples of 8 bytes.
-  CharUnits StackSlotSize = CharUnits::fromQuantity(8);
-  CharUnits StackSize;
-  if (IsIndirect)
-    StackSize = StackSlotSize;
-  else
-    StackSize = TySize.alignTo(StackSlotSize);
-
-  llvm::Value *StackSizeC = CGF.Builder.getSize(StackSize);
-  llvm::Value *NewStack = CGF.Builder.CreateInBoundsGEP(
-      CGF.Int8Ty, OnStackPtr, StackSizeC, "new_stack");
-
-  // Write the new value of __stack for the next call to va_arg
-  CGF.Builder.CreateStore(NewStack, stack_p);
-
-  if (CGF.CGM.getDataLayout().isBigEndian() && !isAggregateTypeForABI(Ty) &&
-      TySize < StackSlotSize) {
-    CharUnits Offset = StackSlotSize - TySize;
-    OnStackAddr = CGF.Builder.CreateConstInBoundsByteGEP(OnStackAddr, Offset);
-  }
-
-  OnStackAddr = CGF.Builder.CreateElementBitCast(OnStackAddr, MemTy);
-
-  CGF.EmitBranch(ContBlock);
-
-  //=======================================
-  // Tidy up
-  //=======================================
-  CGF.EmitBlock(ContBlock);
-
-  Address ResAddr = emitMergePHI(CGF, RegAddr, InRegBlock, OnStackAddr,
-                                 OnStackBlock, "vaargs.addr");
-
-  if (IsIndirect)
-    return Address(CGF.Builder.CreateLoad(ResAddr, "vaarg.addr"), ElementTy,
-                   TyAlign);
-
-  return ResAddr;
-}
-
-Address AArch64ABIInfo::EmitDarwinVAArg(Address VAListAddr, QualType Ty,
-                                        CodeGenFunction &CGF) const {
-  // The backend's lowering doesn't support va_arg for aggregates or
-  // illegal vector types.  Lower VAArg here for these cases and use
-  // the LLVM va_arg instruction for everything else.
-  if (!isAggregateTypeForABI(Ty) && !isIllegalVectorType(Ty))
-    return EmitVAArgInstr(CGF, VAListAddr, Ty, ABIArgInfo::getDirect());
-
-  uint64_t PointerSize = getTarget().getPointerWidth(LangAS::Default) / 8;
-  CharUnits SlotSize = CharUnits::fromQuantity(PointerSize);
-
-  // Empty records are ignored for parameter passing purposes.
-  if (isEmptyRecord(getContext(), Ty, true)) {
-    Address Addr = Address(CGF.Builder.CreateLoad(VAListAddr, "ap.cur"),
-                           getVAListElementType(CGF), SlotSize);
-    Addr = CGF.Builder.CreateElementBitCast(Addr, CGF.ConvertTypeForMem(Ty));
-    return Addr;
-  }
-
-  // The size of the actual thing passed, which might end up just
-  // being a pointer for indirect types.
-  auto TyInfo = getContext().getTypeInfoInChars(Ty);
-
-  // Arguments bigger than 16 bytes which aren't homogeneous
-  // aggregates should be passed indirectly.
-  bool IsIndirect = false;
-  if (TyInfo.Width.getQuantity() > 16) {
-    const Type *Base = nullptr;
-    uint64_t Members = 0;
-    IsIndirect = !isHomogeneousAggregate(Ty, Base, Members);
-  }
-
-  return emitVoidPtrVAArg(CGF, VAListAddr, Ty, IsIndirect,
-                          TyInfo, SlotSize, /*AllowHigherAlign*/ true);
-}
-
-Address AArch64ABIInfo::EmitMSVAArg(CodeGenFunction &CGF, Address VAListAddr,
-                                    QualType Ty) const {
-  bool IsIndirect = false;
-
-  // Composites larger than 16 bytes are passed by reference.
-  if (isAggregateTypeForABI(Ty) && getContext().getTypeSize(Ty) > 128)
-    IsIndirect = true;
-
-  return emitVoidPtrVAArg(CGF, VAListAddr, Ty, IsIndirect,
-                          CGF.getContext().getTypeInfoInChars(Ty),
-                          CharUnits::fromQuantity(8),
-                          /*allowHigherAlign*/ false);
-}
-
-//===----------------------------------------------------------------------===//
-// ARM ABI Implementation
-//===----------------------------------------------------------------------===//
-
-namespace {
-
-enum class ARMABIKind {
-  APCS = 0,
-  AAPCS = 1,
-  AAPCS_VFP = 2,
-  AAPCS16_VFP = 3,
-};
-
-class ARMABIInfo : public ABIInfo {
-  ARMABIKind Kind;
-  bool IsFloatABISoftFP;
-
-public:
-  ARMABIInfo(CodeGenTypes &CGT, ARMABIKind Kind) : ABIInfo(CGT), Kind(Kind) {
-    setCCs();
-    IsFloatABISoftFP = CGT.getCodeGenOpts().FloatABI == "softfp" ||
-        CGT.getCodeGenOpts().FloatABI == ""; // default
-  }
-
-  bool isEABI() const {
-    switch (getTarget().getTriple().getEnvironment()) {
-    case llvm::Triple::Android:
-    case llvm::Triple::EABI:
-    case llvm::Triple::EABIHF:
-    case llvm::Triple::GNUEABI:
-    case llvm::Triple::GNUEABIHF:
-    case llvm::Triple::MuslEABI:
-    case llvm::Triple::MuslEABIHF:
-      return true;
-    default:
-      return getTarget().getTriple().isOHOSFamily();
-    }
-  }
-
-  bool isEABIHF() const {
-    switch (getTarget().getTriple().getEnvironment()) {
-    case llvm::Triple::EABIHF:
-    case llvm::Triple::GNUEABIHF:
-    case llvm::Triple::MuslEABIHF:
-      return true;
-    default:
-      return false;
-    }
-  }
-
-  ARMABIKind getABIKind() const { return Kind; }
-
-  bool allowBFloatArgsAndRet() const override {
-    return !IsFloatABISoftFP && getTarget().hasBFloat16Type();
-  }
-
-private:
-  ABIArgInfo classifyReturnType(QualType RetTy, bool isVariadic,
-                                unsigned functionCallConv) const;
-  ABIArgInfo classifyArgumentType(QualType RetTy, bool isVariadic,
-                                  unsigned functionCallConv) const;
-  ABIArgInfo classifyHomogeneousAggregate(QualType Ty, const Type *Base,
-                                          uint64_t Members) const;
-  ABIArgInfo coerceIllegalVector(QualType Ty) const;
-  bool isIllegalVectorType(QualType Ty) const;
-  bool containsAnyFP16Vectors(QualType Ty) const;
-
-  bool isHomogeneousAggregateBaseType(QualType Ty) const override;
-  bool isHomogeneousAggregateSmallEnough(const Type *Ty,
-                                         uint64_t Members) const override;
-  bool isZeroLengthBitfieldPermittedInHomogeneousAggregate() const override;
-
-  bool isEffectivelyAAPCS_VFP(unsigned callConvention, bool acceptHalf) const;
-
-  void computeInfo(CGFunctionInfo &FI) const override;
-
-  Address EmitVAArg(CodeGenFunction &CGF, Address VAListAddr,
-                    QualType Ty) const override;
-
-  llvm::CallingConv::ID getLLVMDefaultCC() const;
-  llvm::CallingConv::ID getABIDefaultCC() const;
-  void setCCs();
-};
-
-class ARMSwiftABIInfo : public SwiftABIInfo {
-public:
-  explicit ARMSwiftABIInfo(CodeGenTypes &CGT)
-      : SwiftABIInfo(CGT, /*SwiftErrorInRegister=*/true) {}
-
-  bool isLegalVectorType(CharUnits VectorSize, llvm::Type *EltTy,
-                         unsigned NumElts) const override;
-};
-
-class ARMTargetCodeGenInfo : public TargetCodeGenInfo {
-public:
-  ARMTargetCodeGenInfo(CodeGenTypes &CGT, ARMABIKind K)
-      : TargetCodeGenInfo(std::make_unique<ARMABIInfo>(CGT, K)) {
-    SwiftInfo = std::make_unique<ARMSwiftABIInfo>(CGT);
-  }
-
-  int getDwarfEHStackPointer(CodeGen::CodeGenModule &M) const override {
-    return 13;
-  }
-
-  StringRef getARCRetainAutoreleasedReturnValueMarker() const override {
-    return "mov\tr7, r7\t\t// marker for objc_retainAutoreleaseReturnValue";
-  }
-
-  bool initDwarfEHRegSizeTable(CodeGen::CodeGenFunction &CGF,
-                               llvm::Value *Address) const override {
-    llvm::Value *Four8 = llvm::ConstantInt::get(CGF.Int8Ty, 4);
-
-    // 0-15 are the 16 integer registers.
-    AssignToArrayRange(CGF.Builder, Address, Four8, 0, 15);
-    return false;
-  }
-
-  unsigned getSizeOfUnwindException() const override {
-    if (static_cast<const ARMABIInfo &>(TargetCodeGenInfo::getABIInfo())
-            .isEABI())
-      return 88;
-    return TargetCodeGenInfo::getSizeOfUnwindException();
-  }
-
-  void setTargetAttributes(const Decl *D, llvm::GlobalValue *GV,
-                           CodeGen::CodeGenModule &CGM) const override {
-    if (GV->isDeclaration())
-      return;
-    const FunctionDecl *FD = dyn_cast_or_null<FunctionDecl>(D);
-    if (!FD)
-      return;
-    auto *Fn = cast<llvm::Function>(GV);
-
-    if (const auto *TA = FD->getAttr<TargetAttr>()) {
-      ParsedTargetAttr Attr =
-          CGM.getTarget().parseTargetAttr(TA->getFeaturesStr());
-      if (!Attr.BranchProtection.empty()) {
-        TargetInfo::BranchProtectionInfo BPI;
-        StringRef DiagMsg;
-        StringRef Arch =
-            Attr.CPU.empty() ? CGM.getTarget().getTargetOpts().CPU : Attr.CPU;
-        if (!CGM.getTarget().validateBranchProtection(Attr.BranchProtection,
-                                                      Arch, BPI, DiagMsg)) {
-          CGM.getDiags().Report(
-              D->getLocation(),
-              diag::warn_target_unsupported_branch_protection_attribute)
-              << Arch;
-        } else {
-          static const char *SignReturnAddrStr[] = {"none", "non-leaf", "all"};
-          assert(static_cast<unsigned>(BPI.SignReturnAddr) <= 2 &&
-                 "Unexpected SignReturnAddressScopeKind");
-          Fn->addFnAttr(
-              "sign-return-address",
-              SignReturnAddrStr[static_cast<int>(BPI.SignReturnAddr)]);
-
-          Fn->addFnAttr("branch-target-enforcement",
-                        BPI.BranchTargetEnforcement ? "true" : "false");
-        }
-      } else if (CGM.getLangOpts().BranchTargetEnforcement ||
-                 CGM.getLangOpts().hasSignReturnAddress()) {
-        // If the Branch Protection attribute is missing, validate the target
-        // Architecture attribute against Branch Protection command line
-        // settings.
-        if (!CGM.getTarget().isBranchProtectionSupportedArch(Attr.CPU))
-          CGM.getDiags().Report(
-              D->getLocation(),
-              diag::warn_target_unsupported_branch_protection_attribute)
-              << Attr.CPU;
-      }
-    }
-
-    const ARMInterruptAttr *Attr = FD->getAttr<ARMInterruptAttr>();
-    if (!Attr)
-      return;
-
-    const char *Kind;
-    switch (Attr->getInterrupt()) {
-    case ARMInterruptAttr::Generic: Kind = ""; break;
-    case ARMInterruptAttr::IRQ:     Kind = "IRQ"; break;
-    case ARMInterruptAttr::FIQ:     Kind = "FIQ"; break;
-    case ARMInterruptAttr::SWI:     Kind = "SWI"; break;
-    case ARMInterruptAttr::ABORT:   Kind = "ABORT"; break;
-    case ARMInterruptAttr::UNDEF:   Kind = "UNDEF"; break;
-    }
-
-    Fn->addFnAttr("interrupt", Kind);
-
-    ARMABIKind ABI = static_cast<const ARMABIInfo&>(getABIInfo()).getABIKind();
-    if (ABI == ARMABIKind::APCS)
-      return;
-
-    // AAPCS guarantees that sp will be 8-byte aligned on any public interface,
-    // however this is not necessarily true on taking any interrupt. Instruct
-    // the backend to perform a realignment as part of the function prologue.
-    llvm::AttrBuilder B(Fn->getContext());
-    B.addStackAlignmentAttr(8);
-    Fn->addFnAttrs(B);
-  }
-};
-
-class WindowsARMTargetCodeGenInfo : public ARMTargetCodeGenInfo {
-public:
-  WindowsARMTargetCodeGenInfo(CodeGenTypes &CGT, ARMABIKind K)
-      : ARMTargetCodeGenInfo(CGT, K) {}
-
-  void setTargetAttributes(const Decl *D, llvm::GlobalValue *GV,
-                           CodeGen::CodeGenModule &CGM) const override;
-
-  void getDependentLibraryOption(llvm::StringRef Lib,
-                                 llvm::SmallString<24> &Opt) const override {
-    Opt = "/DEFAULTLIB:" + qualifyWindowsLibrary(Lib);
-  }
-
-  void getDetectMismatchOption(llvm::StringRef Name, llvm::StringRef Value,
-                               llvm::SmallString<32> &Opt) const override {
-    Opt = "/FAILIFMISMATCH:\"" + Name.str() + "=" + Value.str() + "\"";
-  }
-};
-
-void WindowsARMTargetCodeGenInfo::setTargetAttributes(
-    const Decl *D, llvm::GlobalValue *GV, CodeGen::CodeGenModule &CGM) const {
-  ARMTargetCodeGenInfo::setTargetAttributes(D, GV, CGM);
-  if (GV->isDeclaration())
-    return;
-  addStackProbeTargetAttributes(D, GV, CGM);
-}
-}
-
-void ARMABIInfo::computeInfo(CGFunctionInfo &FI) const {
-  if (!::classifyReturnType(getCXXABI(), FI, *this))
-    FI.getReturnInfo() = classifyReturnType(FI.getReturnType(), FI.isVariadic(),
-                                            FI.getCallingConvention());
-
-  for (auto &I : FI.arguments())
-    I.info = classifyArgumentType(I.type, FI.isVariadic(),
-                                  FI.getCallingConvention());
-
-
-  // Always honor user-specified calling convention.
-  if (FI.getCallingConvention() != llvm::CallingConv::C)
-    return;
-
-  llvm::CallingConv::ID cc = getRuntimeCC();
-  if (cc != llvm::CallingConv::C)
-    FI.setEffectiveCallingConvention(cc);
-}
-
-/// Return the default calling convention that LLVM will use.
-llvm::CallingConv::ID ARMABIInfo::getLLVMDefaultCC() const {
-  // The default calling convention that LLVM will infer.
-  if (isEABIHF() || getTarget().getTriple().isWatchABI())
-    return llvm::CallingConv::ARM_AAPCS_VFP;
-  else if (isEABI())
-    return llvm::CallingConv::ARM_AAPCS;
-  else
-    return llvm::CallingConv::ARM_APCS;
-}
-
-/// Return the calling convention that our ABI would like us to use
-/// as the C calling convention.
-llvm::CallingConv::ID ARMABIInfo::getABIDefaultCC() const {
-  switch (getABIKind()) {
-  case ARMABIKind::APCS:
-    return llvm::CallingConv::ARM_APCS;
-  case ARMABIKind::AAPCS:
-    return llvm::CallingConv::ARM_AAPCS;
-  case ARMABIKind::AAPCS_VFP:
-    return llvm::CallingConv::ARM_AAPCS_VFP;
-  case ARMABIKind::AAPCS16_VFP:
-    return llvm::CallingConv::ARM_AAPCS_VFP;
-  }
-  llvm_unreachable("bad ABI kind");
-}
-
-void ARMABIInfo::setCCs() {
-  assert(getRuntimeCC() == llvm::CallingConv::C);
-
-  // Don't muddy up the IR with a ton of explicit annotations if
-  // they'd just match what LLVM will infer from the triple.
-  llvm::CallingConv::ID abiCC = getABIDefaultCC();
-  if (abiCC != getLLVMDefaultCC())
-    RuntimeCC = abiCC;
-}
-
-ABIArgInfo ARMABIInfo::coerceIllegalVector(QualType Ty) const {
-  uint64_t Size = getContext().getTypeSize(Ty);
-  if (Size <= 32) {
-    llvm::Type *ResType =
-        llvm::Type::getInt32Ty(getVMContext());
-    return ABIArgInfo::getDirect(ResType);
-  }
-  if (Size == 64 || Size == 128) {
-    auto *ResType = llvm::FixedVectorType::get(
-        llvm::Type::getInt32Ty(getVMContext()), Size / 32);
-    return ABIArgInfo::getDirect(ResType);
-  }
-  return getNaturalAlignIndirect(Ty, /*ByVal=*/false);
-}
-
-ABIArgInfo ARMABIInfo::classifyHomogeneousAggregate(QualType Ty,
-                                                    const Type *Base,
-                                                    uint64_t Members) const {
-  assert(Base && "Base class should be set for homogeneous aggregate");
-  // Base can be a floating-point or a vector.
-  if (const VectorType *VT = Base->getAs<VectorType>()) {
-    // FP16 vectors should be converted to integer vectors
-    if (!getTarget().hasLegalHalfType() && containsAnyFP16Vectors(Ty)) {
-      uint64_t Size = getContext().getTypeSize(VT);
-      auto *NewVecTy = llvm::FixedVectorType::get(
-          llvm::Type::getInt32Ty(getVMContext()), Size / 32);
-      llvm::Type *Ty = llvm::ArrayType::get(NewVecTy, Members);
-      return ABIArgInfo::getDirect(Ty, 0, nullptr, false);
-    }
-  }
-  unsigned Align = 0;
-  if (getABIKind() == ARMABIKind::AAPCS ||
-      getABIKind() == ARMABIKind::AAPCS_VFP) {
-    // For alignment adjusted HFAs, cap the argument alignment to 8, leave it
-    // default otherwise.
-    Align = getContext().getTypeUnadjustedAlignInChars(Ty).getQuantity();
-    unsigned BaseAlign = getContext().getTypeAlignInChars(Base).getQuantity();
-    Align = (Align > BaseAlign && Align >= 8) ? 8 : 0;
-  }
-  return ABIArgInfo::getDirect(nullptr, 0, nullptr, false, Align);
-}
-
-ABIArgInfo ARMABIInfo::classifyArgumentType(QualType Ty, bool isVariadic,
-                                            unsigned functionCallConv) const {
-  // 6.1.2.1 The following argument types are VFP CPRCs:
-  //   A single-precision floating-point type (including promoted
-  //   half-precision types); A double-precision floating-point type;
-  //   A 64-bit or 128-bit containerized vector type; Homogeneous Aggregate
-  //   with a Base Type of a single- or double-precision floating-point type,
-  //   64-bit containerized vectors or 128-bit containerized vectors with one
-  //   to four Elements.
-  // Variadic functions should always marshal to the base standard.
-  bool IsAAPCS_VFP =
-      !isVariadic && isEffectivelyAAPCS_VFP(functionCallConv, /* AAPCS16 */ false);
-
-  Ty = useFirstFieldIfTransparentUnion(Ty);
-
-  // Handle illegal vector types here.
-  if (isIllegalVectorType(Ty))
-    return coerceIllegalVector(Ty);
-
-  if (!isAggregateTypeForABI(Ty)) {
-    // Treat an enum type as its underlying type.
-    if (const EnumType *EnumTy = Ty->getAs<EnumType>()) {
-      Ty = EnumTy->getDecl()->getIntegerType();
-    }
-
-    if (const auto *EIT = Ty->getAs<BitIntType>())
-      if (EIT->getNumBits() > 64)
-        return getNaturalAlignIndirect(Ty, /*ByVal=*/true);
-
-    return (isPromotableIntegerTypeForABI(Ty) ? ABIArgInfo::getExtend(Ty)
-                                              : ABIArgInfo::getDirect());
-  }
-
-  if (CGCXXABI::RecordArgABI RAA = getRecordArgABI(Ty, getCXXABI())) {
-    return getNaturalAlignIndirect(Ty, RAA == CGCXXABI::RAA_DirectInMemory);
-  }
-
-  // Ignore empty records.
-  if (isEmptyRecord(getContext(), Ty, true))
-    return ABIArgInfo::getIgnore();
-
-  if (IsAAPCS_VFP) {
-    // Homogeneous Aggregates need to be expanded when we can fit the aggregate
-    // into VFP registers.
-    const Type *Base = nullptr;
-    uint64_t Members = 0;
-    if (isHomogeneousAggregate(Ty, Base, Members))
-      return classifyHomogeneousAggregate(Ty, Base, Members);
-  } else if (getABIKind() == ARMABIKind::AAPCS16_VFP) {
-    // WatchOS does have homogeneous aggregates. Note that we intentionally use
-    // this convention even for a variadic function: the backend will use GPRs
-    // if needed.
-    const Type *Base = nullptr;
-    uint64_t Members = 0;
-    if (isHomogeneousAggregate(Ty, Base, Members)) {
-      assert(Base && Members <= 4 && "unexpected homogeneous aggregate");
-      llvm::Type *Ty =
-        llvm::ArrayType::get(CGT.ConvertType(QualType(Base, 0)), Members);
-      return ABIArgInfo::getDirect(Ty, 0, nullptr, false);
-    }
-  }
-
-  if (getABIKind() == ARMABIKind::AAPCS16_VFP &&
-      getContext().getTypeSizeInChars(Ty) > CharUnits::fromQuantity(16)) {
-    // WatchOS is adopting the 64-bit AAPCS rule on composite types: if they're
-    // bigger than 128-bits, they get placed in space allocated by the caller,
-    // and a pointer is passed.
-    return ABIArgInfo::getIndirect(
-        CharUnits::fromQuantity(getContext().getTypeAlign(Ty) / 8), false);
-  }
-
-  // Support byval for ARM.
-  // The ABI alignment for APCS is 4-byte and for AAPCS at least 4-byte and at
-  // most 8-byte. We realign the indirect argument if type alignment is bigger
-  // than ABI alignment.
-  uint64_t ABIAlign = 4;
-  uint64_t TyAlign;
-  if (getABIKind() == ARMABIKind::AAPCS_VFP ||
-      getABIKind() == ARMABIKind::AAPCS) {
-    TyAlign = getContext().getTypeUnadjustedAlignInChars(Ty).getQuantity();
-    ABIAlign = std::clamp(TyAlign, (uint64_t)4, (uint64_t)8);
-  } else {
-    TyAlign = getContext().getTypeAlignInChars(Ty).getQuantity();
-  }
-  if (getContext().getTypeSizeInChars(Ty) > CharUnits::fromQuantity(64)) {
-    assert(getABIKind() != ARMABIKind::AAPCS16_VFP && "unexpected byval");
-    return ABIArgInfo::getIndirect(CharUnits::fromQuantity(ABIAlign),
-                                   /*ByVal=*/true,
-                                   /*Realign=*/TyAlign > ABIAlign);
-  }
-
-  // On RenderScript, coerce Aggregates <= 64 bytes to an integer array of
-  // same size and alignment.
-  if (getTarget().isRenderScriptTarget()) {
-    return coerceToIntArray(Ty, getContext(), getVMContext());
-  }
-
-  // Otherwise, pass by coercing to a structure of the appropriate size.
-  llvm::Type* ElemTy;
-  unsigned SizeRegs;
-  // FIXME: Try to match the types of the arguments more accurately where
-  // we can.
-  if (TyAlign <= 4) {
-    ElemTy = llvm::Type::getInt32Ty(getVMContext());
-    SizeRegs = (getContext().getTypeSize(Ty) + 31) / 32;
-  } else {
-    ElemTy = llvm::Type::getInt64Ty(getVMContext());
-    SizeRegs = (getContext().getTypeSize(Ty) + 63) / 64;
-  }
-
-  return ABIArgInfo::getDirect(llvm::ArrayType::get(ElemTy, SizeRegs));
-}
-
-static bool isIntegerLikeType(QualType Ty, ASTContext &Context,
-                              llvm::LLVMContext &VMContext) {
-  // APCS, C Language Calling Conventions, Non-Simple Return Values: A structure
-  // is called integer-like if its size is less than or equal to one word, and
-  // the offset of each of its addressable sub-fields is zero.
-
-  uint64_t Size = Context.getTypeSize(Ty);
-
-  // Check that the type fits in a word.
-  if (Size > 32)
-    return false;
-
-  // FIXME: Handle vector types!
-  if (Ty->isVectorType())
-    return false;
-
-  // Float types are never treated as "integer like".
-  if (Ty->isRealFloatingType())
-    return false;
-
-  // If this is a builtin or pointer type then it is ok.
-  if (Ty->getAs<BuiltinType>() || Ty->isPointerType())
-    return true;
-
-  // Small complex integer types are "integer like".
-  if (const ComplexType *CT = Ty->getAs<ComplexType>())
-    return isIntegerLikeType(CT->getElementType(), Context, VMContext);
-
-  // Single element and zero sized arrays should be allowed, by the definition
-  // above, but they are not.
-
-  // Otherwise, it must be a record type.
-  const RecordType *RT = Ty->getAs<RecordType>();
-  if (!RT) return false;
-
-  // Ignore records with flexible arrays.
-  const RecordDecl *RD = RT->getDecl();
-  if (RD->hasFlexibleArrayMember())
-    return false;
-
-  // Check that all sub-fields are at offset 0, and are themselves "integer
-  // like".
-  const ASTRecordLayout &Layout = Context.getASTRecordLayout(RD);
-
-  bool HadField = false;
-  unsigned idx = 0;
-  for (RecordDecl::field_iterator i = RD->field_begin(), e = RD->field_end();
-       i != e; ++i, ++idx) {
-    const FieldDecl *FD = *i;
-
-    // Bit-fields are not addressable, we only need to verify they are "integer
-    // like". We still have to disallow a subsequent non-bitfield, for example:
-    //   struct { int : 0; int x }
-    // is non-integer like according to gcc.
-    if (FD->isBitField()) {
-      if (!RD->isUnion())
-        HadField = true;
-
-      if (!isIntegerLikeType(FD->getType(), Context, VMContext))
-        return false;
-
-      continue;
-    }
-
-    // Check if this field is at offset 0.
-    if (Layout.getFieldOffset(idx) != 0)
-      return false;
-
-    if (!isIntegerLikeType(FD->getType(), Context, VMContext))
-      return false;
-
-    // Only allow at most one field in a structure. This doesn't match the
-    // wording above, but follows gcc in situations with a field following an
-    // empty structure.
-    if (!RD->isUnion()) {
-      if (HadField)
-        return false;
-
-      HadField = true;
-    }
-  }
-
-  return true;
-}
-
-ABIArgInfo ARMABIInfo::classifyReturnType(QualType RetTy, bool isVariadic,
-                                          unsigned functionCallConv) const {
-
-  // Variadic functions should always marshal to the base standard.
-  bool IsAAPCS_VFP =
-      !isVariadic && isEffectivelyAAPCS_VFP(functionCallConv, /* AAPCS16 */ true);
-
-  if (RetTy->isVoidType())
-    return ABIArgInfo::getIgnore();
-
-  if (const VectorType *VT = RetTy->getAs<VectorType>()) {
-    // Large vector types should be returned via memory.
-    if (getContext().getTypeSize(RetTy) > 128)
-      return getNaturalAlignIndirect(RetTy);
-    // TODO: FP16/BF16 vectors should be converted to integer vectors
-    // This check is similar  to isIllegalVectorType - refactor?
-    if ((!getTarget().hasLegalHalfType() &&
-        (VT->getElementType()->isFloat16Type() ||
-         VT->getElementType()->isHalfType())) ||
-        (IsFloatABISoftFP &&
-         VT->getElementType()->isBFloat16Type()))
-      return coerceIllegalVector(RetTy);
-  }
-
-  if (!isAggregateTypeForABI(RetTy)) {
-    // Treat an enum type as its underlying type.
-    if (const EnumType *EnumTy = RetTy->getAs<EnumType>())
-      RetTy = EnumTy->getDecl()->getIntegerType();
-
-    if (const auto *EIT = RetTy->getAs<BitIntType>())
-      if (EIT->getNumBits() > 64)
-        return getNaturalAlignIndirect(RetTy, /*ByVal=*/false);
-
-    return isPromotableIntegerTypeForABI(RetTy) ? ABIArgInfo::getExtend(RetTy)
-                                                : ABIArgInfo::getDirect();
-  }
-
-  // Are we following APCS?
-  if (getABIKind() == ARMABIKind::APCS) {
-    if (isEmptyRecord(getContext(), RetTy, false))
-      return ABIArgInfo::getIgnore();
-
-    // Complex types are all returned as packed integers.
-    //
-    // FIXME: Consider using 2 x vector types if the back end handles them
-    // correctly.
-    if (RetTy->isAnyComplexType())
-      return ABIArgInfo::getDirect(llvm::IntegerType::get(
-          getVMContext(), getContext().getTypeSize(RetTy)));
-
-    // Integer like structures are returned in r0.
-    if (isIntegerLikeType(RetTy, getContext(), getVMContext())) {
-      // Return in the smallest viable integer type.
-      uint64_t Size = getContext().getTypeSize(RetTy);
-      if (Size <= 8)
-        return ABIArgInfo::getDirect(llvm::Type::getInt8Ty(getVMContext()));
-      if (Size <= 16)
-        return ABIArgInfo::getDirect(llvm::Type::getInt16Ty(getVMContext()));
-      return ABIArgInfo::getDirect(llvm::Type::getInt32Ty(getVMContext()));
-    }
-
-    // Otherwise return in memory.
-    return getNaturalAlignIndirect(RetTy);
-  }
-
-  // Otherwise this is an AAPCS variant.
-
-  if (isEmptyRecord(getContext(), RetTy, true))
-    return ABIArgInfo::getIgnore();
-
-  // Check for homogeneous aggregates with AAPCS-VFP.
-  if (IsAAPCS_VFP) {
-    const Type *Base = nullptr;
-    uint64_t Members = 0;
-    if (isHomogeneousAggregate(RetTy, Base, Members))
-      return classifyHomogeneousAggregate(RetTy, Base, Members);
-  }
-
-  // Aggregates <= 4 bytes are returned in r0; other aggregates
-  // are returned indirectly.
-  uint64_t Size = getContext().getTypeSize(RetTy);
-  if (Size <= 32) {
-    // On RenderScript, coerce Aggregates <= 4 bytes to an integer array of
-    // same size and alignment.
-    if (getTarget().isRenderScriptTarget()) {
-      return coerceToIntArray(RetTy, getContext(), getVMContext());
-    }
-    if (getDataLayout().isBigEndian())
-      // Return in 32 bit integer integer type (as if loaded by LDR, AAPCS 5.4)
-      return ABIArgInfo::getDirect(llvm::Type::getInt32Ty(getVMContext()));
-
-    // Return in the smallest viable integer type.
-    if (Size <= 8)
-      return ABIArgInfo::getDirect(llvm::Type::getInt8Ty(getVMContext()));
-    if (Size <= 16)
-      return ABIArgInfo::getDirect(llvm::Type::getInt16Ty(getVMContext()));
-    return ABIArgInfo::getDirect(llvm::Type::getInt32Ty(getVMContext()));
-  } else if (Size <= 128 && getABIKind() == ARMABIKind::AAPCS16_VFP) {
-    llvm::Type *Int32Ty = llvm::Type::getInt32Ty(getVMContext());
-    llvm::Type *CoerceTy =
-        llvm::ArrayType::get(Int32Ty, llvm::alignTo(Size, 32) / 32);
-    return ABIArgInfo::getDirect(CoerceTy);
-  }
-
-  return getNaturalAlignIndirect(RetTy);
-}
-
-/// isIllegalVector - check whether Ty is an illegal vector type.
-bool ARMABIInfo::isIllegalVectorType(QualType Ty) const {
-  if (const VectorType *VT = Ty->getAs<VectorType> ()) {
-    // On targets that don't support half, fp16 or bfloat, they are expanded
-    // into float, and we don't want the ABI to depend on whether or not they
-    // are supported in hardware. Thus return false to coerce vectors of these
-    // types into integer vectors.
-    // We do not depend on hasLegalHalfType for bfloat as it is a
-    // separate IR type.
-    if ((!getTarget().hasLegalHalfType() &&
-        (VT->getElementType()->isFloat16Type() ||
-         VT->getElementType()->isHalfType())) ||
-        (IsFloatABISoftFP &&
-         VT->getElementType()->isBFloat16Type()))
-      return true;
-    if (isAndroid()) {
-      // Android shipped using Clang 3.1, which supported a slightly different
-      // vector ABI. The primary differences were that 3-element vector types
-      // were legal, and so were sub 32-bit vectors (i.e. <2 x i8>). This path
-      // accepts that legacy behavior for Android only.
-      // Check whether VT is legal.
-      unsigned NumElements = VT->getNumElements();
-      // NumElements should be power of 2 or equal to 3.
-      if (!llvm::isPowerOf2_32(NumElements) && NumElements != 3)
-        return true;
-    } else {
-      // Check whether VT is legal.
-      unsigned NumElements = VT->getNumElements();
-      uint64_t Size = getContext().getTypeSize(VT);
-      // NumElements should be power of 2.
-      if (!llvm::isPowerOf2_32(NumElements))
-        return true;
-      // Size should be greater than 32 bits.
-      return Size <= 32;
-    }
-  }
-  return false;
-}
-
-/// Return true if a type contains any 16-bit floating point vectors
-bool ARMABIInfo::containsAnyFP16Vectors(QualType Ty) const {
-  if (const ConstantArrayType *AT = getContext().getAsConstantArrayType(Ty)) {
-    uint64_t NElements = AT->getSize().getZExtValue();
-    if (NElements == 0)
-      return false;
-    return containsAnyFP16Vectors(AT->getElementType());
-  } else if (const RecordType *RT = Ty->getAs<RecordType>()) {
-    const RecordDecl *RD = RT->getDecl();
-
-    // If this is a C++ record, check the bases first.
-    if (const CXXRecordDecl *CXXRD = dyn_cast<CXXRecordDecl>(RD))
-      if (llvm::any_of(CXXRD->bases(), [this](const CXXBaseSpecifier &B) {
-            return containsAnyFP16Vectors(B.getType());
-          }))
-        return true;
-
-    if (llvm::any_of(RD->fields(), [this](FieldDecl *FD) {
-          return FD && containsAnyFP16Vectors(FD->getType());
-        }))
-      return true;
-
-    return false;
-  } else {
-    if (const VectorType *VT = Ty->getAs<VectorType>())
-      return (VT->getElementType()->isFloat16Type() ||
-              VT->getElementType()->isBFloat16Type() ||
-              VT->getElementType()->isHalfType());
-    return false;
-  }
-}
-
-bool ARMSwiftABIInfo::isLegalVectorType(CharUnits VectorSize, llvm::Type *EltTy,
-                                        unsigned NumElts) const {
-  if (!llvm::isPowerOf2_32(NumElts))
-    return false;
-  unsigned size = CGT.getDataLayout().getTypeStoreSizeInBits(EltTy);
-  if (size > 64)
-    return false;
-  if (VectorSize.getQuantity() != 8 &&
-      (VectorSize.getQuantity() != 16 || NumElts == 1))
-    return false;
-  return true;
-}
-
-bool ARMABIInfo::isHomogeneousAggregateBaseType(QualType Ty) const {
-  // Homogeneous aggregates for AAPCS-VFP must have base types of float,
-  // double, or 64-bit or 128-bit vectors.
-  if (const BuiltinType *BT = Ty->getAs<BuiltinType>()) {
-    if (BT->getKind() == BuiltinType::Float ||
-        BT->getKind() == BuiltinType::Double ||
-        BT->getKind() == BuiltinType::LongDouble)
-      return true;
-  } else if (const VectorType *VT = Ty->getAs<VectorType>()) {
-    unsigned VecSize = getContext().getTypeSize(VT);
-    if (VecSize == 64 || VecSize == 128)
-      return true;
-  }
-  return false;
-}
-
-bool ARMABIInfo::isHomogeneousAggregateSmallEnough(const Type *Base,
-                                                   uint64_t Members) const {
-  return Members <= 4;
-}
-
-bool ARMABIInfo::isZeroLengthBitfieldPermittedInHomogeneousAggregate() const {
-  // AAPCS32 says that the rule for whether something is a homogeneous
-  // aggregate is applied to the output of the data layout decision. So
-  // anything that doesn't affect the data layout also does not affect
-  // homogeneity. In particular, zero-length bitfields don't stop a struct
-  // being homogeneous.
-  return true;
-}
-
-bool ARMABIInfo::isEffectivelyAAPCS_VFP(unsigned callConvention,
-                                        bool acceptHalf) const {
-  // Give precedence to user-specified calling conventions.
-  if (callConvention != llvm::CallingConv::C)
-    return (callConvention == llvm::CallingConv::ARM_AAPCS_VFP);
-  else
-    return (getABIKind() == ARMABIKind::AAPCS_VFP) ||
-           (acceptHalf && (getABIKind() == ARMABIKind::AAPCS16_VFP));
-}
-
-Address ARMABIInfo::EmitVAArg(CodeGenFunction &CGF, Address VAListAddr,
-                              QualType Ty) const {
-  CharUnits SlotSize = CharUnits::fromQuantity(4);
-
-  // Empty records are ignored for parameter passing purposes.
-  if (isEmptyRecord(getContext(), Ty, true)) {
-    VAListAddr = CGF.Builder.CreateElementBitCast(VAListAddr, CGF.Int8PtrTy);
-    auto *Load = CGF.Builder.CreateLoad(VAListAddr);
-    Address Addr = Address(Load, CGF.Int8Ty, SlotSize);
-    return CGF.Builder.CreateElementBitCast(Addr, CGF.ConvertTypeForMem(Ty));
-  }
-
-  CharUnits TySize = getContext().getTypeSizeInChars(Ty);
-  CharUnits TyAlignForABI = getContext().getTypeUnadjustedAlignInChars(Ty);
-
-  // Use indirect if size of the illegal vector is bigger than 16 bytes.
-  bool IsIndirect = false;
-  const Type *Base = nullptr;
-  uint64_t Members = 0;
-  if (TySize > CharUnits::fromQuantity(16) && isIllegalVectorType(Ty)) {
-    IsIndirect = true;
-
-  // ARMv7k passes structs bigger than 16 bytes indirectly, in space
-  // allocated by the caller.
-  } else if (TySize > CharUnits::fromQuantity(16) &&
-             getABIKind() == ARMABIKind::AAPCS16_VFP &&
-             !isHomogeneousAggregate(Ty, Base, Members)) {
-    IsIndirect = true;
-
-  // Otherwise, bound the type's ABI alignment.
-  // The ABI alignment for 64-bit or 128-bit vectors is 8 for AAPCS and 4 for
-  // APCS. For AAPCS, the ABI alignment is at least 4-byte and at most 8-byte.
-  // Our callers should be prepared to handle an under-aligned address.
-  } else if (getABIKind() == ARMABIKind::AAPCS_VFP ||
-             getABIKind() == ARMABIKind::AAPCS) {
-    TyAlignForABI = std::max(TyAlignForABI, CharUnits::fromQuantity(4));
-    TyAlignForABI = std::min(TyAlignForABI, CharUnits::fromQuantity(8));
-  } else if (getABIKind() == ARMABIKind::AAPCS16_VFP) {
-    // ARMv7k allows type alignment up to 16 bytes.
-    TyAlignForABI = std::max(TyAlignForABI, CharUnits::fromQuantity(4));
-    TyAlignForABI = std::min(TyAlignForABI, CharUnits::fromQuantity(16));
-  } else {
-    TyAlignForABI = CharUnits::fromQuantity(4);
-  }
-
-  TypeInfoChars TyInfo(TySize, TyAlignForABI, AlignRequirementKind::None);
-  return emitVoidPtrVAArg(CGF, VAListAddr, Ty, IsIndirect, TyInfo,
-                          SlotSize, /*AllowHigherAlign*/ true);
-}
-
-//===----------------------------------------------------------------------===//
-// NVPTX ABI Implementation
-//===----------------------------------------------------------------------===//
-
-namespace {
-
-class NVPTXTargetCodeGenInfo;
-
-class NVPTXABIInfo : public ABIInfo {
-  NVPTXTargetCodeGenInfo &CGInfo;
-
-public:
-  NVPTXABIInfo(CodeGenTypes &CGT, NVPTXTargetCodeGenInfo &Info)
-      : ABIInfo(CGT), CGInfo(Info) {}
-
-  ABIArgInfo classifyReturnType(QualType RetTy) const;
-  ABIArgInfo classifyArgumentType(QualType Ty) const;
-
-  void computeInfo(CGFunctionInfo &FI) const override;
-  Address EmitVAArg(CodeGenFunction &CGF, Address VAListAddr,
-                    QualType Ty) const override;
-  bool isUnsupportedType(QualType T) const;
-  ABIArgInfo coerceToIntArrayWithLimit(QualType Ty, unsigned MaxSize) const;
-};
-
-class NVPTXTargetCodeGenInfo : public TargetCodeGenInfo {
-public:
-  NVPTXTargetCodeGenInfo(CodeGenTypes &CGT)
-      : TargetCodeGenInfo(std::make_unique<NVPTXABIInfo>(CGT, *this)) {}
-
-  void setTargetAttributes(const Decl *D, llvm::GlobalValue *GV,
-                           CodeGen::CodeGenModule &M) const override;
-  bool shouldEmitStaticExternCAliases() const override;
-
-  llvm::Type *getCUDADeviceBuiltinSurfaceDeviceType() const override {
-    // On the device side, surface reference is represented as an object handle
-    // in 64-bit integer.
-    return llvm::Type::getInt64Ty(getABIInfo().getVMContext());
-  }
-
-  llvm::Type *getCUDADeviceBuiltinTextureDeviceType() const override {
-    // On the device side, texture reference is represented as an object handle
-    // in 64-bit integer.
-    return llvm::Type::getInt64Ty(getABIInfo().getVMContext());
-  }
-
-  bool emitCUDADeviceBuiltinSurfaceDeviceCopy(CodeGenFunction &CGF, LValue Dst,
-                                              LValue Src) const override {
-    emitBuiltinSurfTexDeviceCopy(CGF, Dst, Src);
-    return true;
-  }
-
-  bool emitCUDADeviceBuiltinTextureDeviceCopy(CodeGenFunction &CGF, LValue Dst,
-                                              LValue Src) const override {
-    emitBuiltinSurfTexDeviceCopy(CGF, Dst, Src);
-    return true;
-  }
-
-private:
-  // Adds a NamedMDNode with GV, Name, and Operand as operands, and adds the
-  // resulting MDNode to the nvvm.annotations MDNode.
-  static void addNVVMMetadata(llvm::GlobalValue *GV, StringRef Name,
-                              int Operand);
-
-  static void emitBuiltinSurfTexDeviceCopy(CodeGenFunction &CGF, LValue Dst,
-                                           LValue Src) {
-    llvm::Value *Handle = nullptr;
-    llvm::Constant *C =
-        llvm::dyn_cast<llvm::Constant>(Src.getAddress(CGF).getPointer());
-    // Lookup `addrspacecast` through the constant pointer if any.
-    if (auto *ASC = llvm::dyn_cast_or_null<llvm::AddrSpaceCastOperator>(C))
-      C = llvm::cast<llvm::Constant>(ASC->getPointerOperand());
-    if (auto *GV = llvm::dyn_cast_or_null<llvm::GlobalVariable>(C)) {
-      // Load the handle from the specific global variable using
-      // `nvvm.texsurf.handle.internal` intrinsic.
-      Handle = CGF.EmitRuntimeCall(
-          CGF.CGM.getIntrinsic(llvm::Intrinsic::nvvm_texsurf_handle_internal,
-                               {GV->getType()}),
-          {GV}, "texsurf_handle");
-    } else
-      Handle = CGF.EmitLoadOfScalar(Src, SourceLocation());
-    CGF.EmitStoreOfScalar(Handle, Dst);
-  }
-};
-
-/// Checks if the type is unsupported directly by the current target.
-bool NVPTXABIInfo::isUnsupportedType(QualType T) const {
-  ASTContext &Context = getContext();
-  if (!Context.getTargetInfo().hasFloat16Type() && T->isFloat16Type())
-    return true;
-  if (!Context.getTargetInfo().hasFloat128Type() &&
-      (T->isFloat128Type() ||
-       (T->isRealFloatingType() && Context.getTypeSize(T) == 128)))
-    return true;
-  if (const auto *EIT = T->getAs<BitIntType>())
-    return EIT->getNumBits() >
-           (Context.getTargetInfo().hasInt128Type() ? 128U : 64U);
-  if (!Context.getTargetInfo().hasInt128Type() && T->isIntegerType() &&
-      Context.getTypeSize(T) > 64U)
-    return true;
-  if (const auto *AT = T->getAsArrayTypeUnsafe())
-    return isUnsupportedType(AT->getElementType());
-  const auto *RT = T->getAs<RecordType>();
-  if (!RT)
-    return false;
-  const RecordDecl *RD = RT->getDecl();
-
-  // If this is a C++ record, check the bases first.
-  if (const CXXRecordDecl *CXXRD = dyn_cast<CXXRecordDecl>(RD))
-    for (const CXXBaseSpecifier &I : CXXRD->bases())
-      if (isUnsupportedType(I.getType()))
-        return true;
-
-  for (const FieldDecl *I : RD->fields())
-    if (isUnsupportedType(I->getType()))
-      return true;
-  return false;
-}
-
-/// Coerce the given type into an array with maximum allowed size of elements.
-ABIArgInfo NVPTXABIInfo::coerceToIntArrayWithLimit(QualType Ty,
-                                                   unsigned MaxSize) const {
-  // Alignment and Size are measured in bits.
-  const uint64_t Size = getContext().getTypeSize(Ty);
-  const uint64_t Alignment = getContext().getTypeAlign(Ty);
-  const unsigned Div = std::min<unsigned>(MaxSize, Alignment);
-  llvm::Type *IntType = llvm::Type::getIntNTy(getVMContext(), Div);
-  const uint64_t NumElements = (Size + Div - 1) / Div;
-  return ABIArgInfo::getDirect(llvm::ArrayType::get(IntType, NumElements));
-}
-
-ABIArgInfo NVPTXABIInfo::classifyReturnType(QualType RetTy) const {
-  if (RetTy->isVoidType())
-    return ABIArgInfo::getIgnore();
-
-  if (getContext().getLangOpts().OpenMP &&
-      getContext().getLangOpts().OpenMPIsDevice && isUnsupportedType(RetTy))
-    return coerceToIntArrayWithLimit(RetTy, 64);
-
-  // note: this is different from default ABI
-  if (!RetTy->isScalarType())
-    return ABIArgInfo::getDirect();
-
-  // Treat an enum type as its underlying type.
-  if (const EnumType *EnumTy = RetTy->getAs<EnumType>())
-    RetTy = EnumTy->getDecl()->getIntegerType();
-
-  return (isPromotableIntegerTypeForABI(RetTy) ? ABIArgInfo::getExtend(RetTy)
-                                               : ABIArgInfo::getDirect());
-}
-
-ABIArgInfo NVPTXABIInfo::classifyArgumentType(QualType Ty) const {
-  // Treat an enum type as its underlying type.
-  if (const EnumType *EnumTy = Ty->getAs<EnumType>())
-    Ty = EnumTy->getDecl()->getIntegerType();
-
-  // Return aggregates type as indirect by value
-  if (isAggregateTypeForABI(Ty)) {
-    // Under CUDA device compilation, tex/surf builtin types are replaced with
-    // object types and passed directly.
-    if (getContext().getLangOpts().CUDAIsDevice) {
-      if (Ty->isCUDADeviceBuiltinSurfaceType())
-        return ABIArgInfo::getDirect(
-            CGInfo.getCUDADeviceBuiltinSurfaceDeviceType());
-      if (Ty->isCUDADeviceBuiltinTextureType())
-        return ABIArgInfo::getDirect(
-            CGInfo.getCUDADeviceBuiltinTextureDeviceType());
-    }
-    return getNaturalAlignIndirect(Ty, /* byval */ true);
-  }
-
-  if (const auto *EIT = Ty->getAs<BitIntType>()) {
-    if ((EIT->getNumBits() > 128) ||
-        (!getContext().getTargetInfo().hasInt128Type() &&
-         EIT->getNumBits() > 64))
-      return getNaturalAlignIndirect(Ty, /* byval */ true);
-  }
-
-  return (isPromotableIntegerTypeForABI(Ty) ? ABIArgInfo::getExtend(Ty)
-                                            : ABIArgInfo::getDirect());
-}
-
-void NVPTXABIInfo::computeInfo(CGFunctionInfo &FI) const {
-  if (!getCXXABI().classifyReturnType(FI))
-    FI.getReturnInfo() = classifyReturnType(FI.getReturnType());
-  for (auto &I : FI.arguments())
-    I.info = classifyArgumentType(I.type);
-
-  // Always honor user-specified calling convention.
-  if (FI.getCallingConvention() != llvm::CallingConv::C)
-    return;
-
-  FI.setEffectiveCallingConvention(getRuntimeCC());
-}
-
-Address NVPTXABIInfo::EmitVAArg(CodeGenFunction &CGF, Address VAListAddr,
-                                QualType Ty) const {
-  llvm_unreachable("NVPTX does not support varargs");
-}
-
-void NVPTXTargetCodeGenInfo::setTargetAttributes(
-    const Decl *D, llvm::GlobalValue *GV, CodeGen::CodeGenModule &M) const {
-  if (GV->isDeclaration())
-    return;
-  const VarDecl *VD = dyn_cast_or_null<VarDecl>(D);
-  if (VD) {
-    if (M.getLangOpts().CUDA) {
-      if (VD->getType()->isCUDADeviceBuiltinSurfaceType())
-        addNVVMMetadata(GV, "surface", 1);
-      else if (VD->getType()->isCUDADeviceBuiltinTextureType())
-        addNVVMMetadata(GV, "texture", 1);
-      return;
-    }
-  }
-
-  const FunctionDecl *FD = dyn_cast_or_null<FunctionDecl>(D);
-  if (!FD) return;
-
-  llvm::Function *F = cast<llvm::Function>(GV);
-
-  // Perform special handling in OpenCL mode
-  if (M.getLangOpts().OpenCL) {
-    // Use OpenCL function attributes to check for kernel functions
-    // By default, all functions are device functions
-    if (FD->hasAttr<OpenCLKernelAttr>()) {
-      // OpenCL __kernel functions get kernel metadata
-      // Create !{<func-ref>, metadata !"kernel", i32 1} node
-      addNVVMMetadata(F, "kernel", 1);
-      // And kernel functions are not subject to inlining
-      F->addFnAttr(llvm::Attribute::NoInline);
-    }
-  }
-
-  // Perform special handling in CUDA mode.
-  if (M.getLangOpts().CUDA) {
-    // CUDA __global__ functions get a kernel metadata entry.  Since
-    // __global__ functions cannot be called from the device, we do not
-    // need to set the noinline attribute.
-    if (FD->hasAttr<CUDAGlobalAttr>()) {
-      // Create !{<func-ref>, metadata !"kernel", i32 1} node
-      addNVVMMetadata(F, "kernel", 1);
-    }
-    if (CUDALaunchBoundsAttr *Attr = FD->getAttr<CUDALaunchBoundsAttr>()) {
-      // Create !{<func-ref>, metadata !"maxntidx", i32 <val>} node
-      llvm::APSInt MaxThreads(32);
-      MaxThreads = Attr->getMaxThreads()->EvaluateKnownConstInt(M.getContext());
-      if (MaxThreads > 0)
-        addNVVMMetadata(F, "maxntidx", MaxThreads.getExtValue());
-
-      // min blocks is an optional argument for CUDALaunchBoundsAttr. If it was
-      // not specified in __launch_bounds__ or if the user specified a 0 value,
-      // we don't have to add a PTX directive.
-      if (Attr->getMinBlocks()) {
-        llvm::APSInt MinBlocks(32);
-        MinBlocks = Attr->getMinBlocks()->EvaluateKnownConstInt(M.getContext());
-        if (MinBlocks > 0)
-          // Create !{<func-ref>, metadata !"minctasm", i32 <val>} node
-          addNVVMMetadata(F, "minctasm", MinBlocks.getExtValue());
-      }
-    }
-  }
-
-  // Attach kernel metadata directly if compiling for NVPTX.
-  if (FD->hasAttr<NVPTXKernelAttr>()) {
-    addNVVMMetadata(F, "kernel", 1);
-  }
-}
-
-void NVPTXTargetCodeGenInfo::addNVVMMetadata(llvm::GlobalValue *GV,
-                                             StringRef Name, int Operand) {
-  llvm::Module *M = GV->getParent();
-  llvm::LLVMContext &Ctx = M->getContext();
-
-  // Get "nvvm.annotations" metadata node
-  llvm::NamedMDNode *MD = M->getOrInsertNamedMetadata("nvvm.annotations");
-
-  llvm::Metadata *MDVals[] = {
-      llvm::ConstantAsMetadata::get(GV), llvm::MDString::get(Ctx, Name),
-      llvm::ConstantAsMetadata::get(
-          llvm::ConstantInt::get(llvm::Type::getInt32Ty(Ctx), Operand))};
-  // Append metadata to nvvm.annotations
-  MD->addOperand(llvm::MDNode::get(Ctx, MDVals));
-}
-
-bool NVPTXTargetCodeGenInfo::shouldEmitStaticExternCAliases() const {
-  return false;
-}
-}
-
-//===----------------------------------------------------------------------===//
-// SystemZ ABI Implementation
-//===----------------------------------------------------------------------===//
-
-namespace {
-
-class SystemZABIInfo : public ABIInfo {
-  bool HasVector;
-  bool IsSoftFloatABI;
-
-public:
-  SystemZABIInfo(CodeGenTypes &CGT, bool HV, bool SF)
-      : ABIInfo(CGT), HasVector(HV), IsSoftFloatABI(SF) {}
-
-  bool isPromotableIntegerTypeForABI(QualType Ty) const;
-  bool isCompoundType(QualType Ty) const;
-  bool isVectorArgumentType(QualType Ty) const;
-  bool isFPArgumentType(QualType Ty) const;
-  QualType GetSingleElementType(QualType Ty) const;
-
-  ABIArgInfo classifyReturnType(QualType RetTy) const;
-  ABIArgInfo classifyArgumentType(QualType ArgTy) const;
-
-  void computeInfo(CGFunctionInfo &FI) const override;
-  Address EmitVAArg(CodeGenFunction &CGF, Address VAListAddr,
-                    QualType Ty) const override;
-};
-
-class SystemZTargetCodeGenInfo : public TargetCodeGenInfo {
-  ASTContext &Ctx;
-
-  // These are used for speeding up the search for a visible vector ABI.
-  mutable bool HasVisibleVecABIFlag = false;
-  mutable std::set<const Type *> SeenTypes;
-
-  // Returns true (the first time) if Ty is, or is found to include, a vector
-  // type that exposes the vector ABI. This is any vector >=16 bytes which
-  // with vector support are aligned to only 8 bytes. When IsParam is true,
-  // the type belongs to a value as passed between functions. If it is a
-  // vector <=16 bytes it will be passed in a vector register (if supported).
-  bool isVectorTypeBased(const Type *Ty, bool IsParam) const;
-
-public:
-  SystemZTargetCodeGenInfo(CodeGenTypes &CGT, bool HasVector, bool SoftFloatABI)
-      : TargetCodeGenInfo(
-            std::make_unique<SystemZABIInfo>(CGT, HasVector, SoftFloatABI)),
-            Ctx(CGT.getContext()) {
-    SwiftInfo =
-        std::make_unique<SwiftABIInfo>(CGT, /*SwiftErrorInRegister=*/false);
-  }
-
-  // The vector ABI is different when the vector facility is present and when
-  // a module e.g. defines an externally visible vector variable, a flag
-  // indicating a visible vector ABI is added. Eventually this will result in
-  // a GNU attribute indicating the vector ABI of the module.  Ty is the type
-  // of a variable or function parameter that is globally visible.
-  void handleExternallyVisibleObjABI(const Type *Ty, CodeGen::CodeGenModule &M,
-                                     bool IsParam) const {
-    if (!HasVisibleVecABIFlag && isVectorTypeBased(Ty, IsParam)) {
-      M.getModule().addModuleFlag(llvm::Module::Warning,
-                                  "s390x-visible-vector-ABI", 1);
-      HasVisibleVecABIFlag = true;
-    }
-  }
-
-  void setTargetAttributes(const Decl *D, llvm::GlobalValue *GV,
-                           CodeGen::CodeGenModule &M) const override {
-    if (!D)
-      return;
-
-    // Check if the vector ABI becomes visible by an externally visible
-    // variable or function.
-    if (const auto *VD = dyn_cast<VarDecl>(D)) {
-      if (VD->isExternallyVisible())
-        handleExternallyVisibleObjABI(VD->getType().getTypePtr(), M,
-                                      /*IsParam*/false);
-    }
-    else if (const FunctionDecl *FD = dyn_cast<FunctionDecl>(D)) {
-      if (FD->isExternallyVisible())
-        handleExternallyVisibleObjABI(FD->getType().getTypePtr(), M,
-                                      /*IsParam*/false);
-    }
-  }
-
-  llvm::Value *testFPKind(llvm::Value *V, unsigned BuiltinID,
-                          CGBuilderTy &Builder,
-                          CodeGenModule &CGM) const override {
-    assert(V->getType()->isFloatingPointTy() && "V should have an FP type.");
-    // Only use TDC in constrained FP mode.
-    if (!Builder.getIsFPConstrained())
-      return nullptr;
-
-    llvm::Type *Ty = V->getType();
-    if (Ty->isFloatTy() || Ty->isDoubleTy() || Ty->isFP128Ty()) {
-      llvm::Module &M = CGM.getModule();
-      auto &Ctx = M.getContext();
-      llvm::Function *TDCFunc =
-          llvm::Intrinsic::getDeclaration(&M, llvm::Intrinsic::s390_tdc, Ty);
-      unsigned TDCBits = 0;
-      switch (BuiltinID) {
-      case Builtin::BI__builtin_isnan:
-        TDCBits = 0xf;
-        break;
-      case Builtin::BIfinite:
-      case Builtin::BI__finite:
-      case Builtin::BIfinitef:
-      case Builtin::BI__finitef:
-      case Builtin::BIfinitel:
-      case Builtin::BI__finitel:
-      case Builtin::BI__builtin_isfinite:
-        TDCBits = 0xfc0;
-        break;
-      case Builtin::BI__builtin_isinf:
-        TDCBits = 0x30;
-        break;
-      default:
-        break;
-      }
-      if (TDCBits)
-        return Builder.CreateCall(
-            TDCFunc,
-            {V, llvm::ConstantInt::get(llvm::Type::getInt64Ty(Ctx), TDCBits)});
-    }
-    return nullptr;
-  }
-};
-}
-
-bool SystemZABIInfo::isPromotableIntegerTypeForABI(QualType Ty) const {
-  // Treat an enum type as its underlying type.
-  if (const EnumType *EnumTy = Ty->getAs<EnumType>())
-    Ty = EnumTy->getDecl()->getIntegerType();
-
-  // Promotable integer types are required to be promoted by the ABI.
-  if (ABIInfo::isPromotableIntegerTypeForABI(Ty))
-    return true;
-
-  if (const auto *EIT = Ty->getAs<BitIntType>())
-    if (EIT->getNumBits() < 64)
-      return true;
-
-  // 32-bit values must also be promoted.
-  if (const BuiltinType *BT = Ty->getAs<BuiltinType>())
-    switch (BT->getKind()) {
-    case BuiltinType::Int:
-    case BuiltinType::UInt:
-      return true;
-    default:
-      return false;
-    }
-  return false;
-}
-
-bool SystemZABIInfo::isCompoundType(QualType Ty) const {
-  return (Ty->isAnyComplexType() ||
-          Ty->isVectorType() ||
-          isAggregateTypeForABI(Ty));
-}
-
-bool SystemZABIInfo::isVectorArgumentType(QualType Ty) const {
-  return (HasVector &&
-          Ty->isVectorType() &&
-          getContext().getTypeSize(Ty) <= 128);
-}
-
-bool SystemZABIInfo::isFPArgumentType(QualType Ty) const {
-  if (IsSoftFloatABI)
-    return false;
-
-  if (const BuiltinType *BT = Ty->getAs<BuiltinType>())
-    switch (BT->getKind()) {
-    case BuiltinType::Float:
-    case BuiltinType::Double:
-      return true;
-    default:
-      return false;
-    }
-
-  return false;
-}
-
-QualType SystemZABIInfo::GetSingleElementType(QualType Ty) const {
-  const RecordType *RT = Ty->getAs<RecordType>();
-
-  if (RT && RT->isStructureOrClassType()) {
-    const RecordDecl *RD = RT->getDecl();
-    QualType Found;
-
-    // If this is a C++ record, check the bases first.
-    if (const CXXRecordDecl *CXXRD = dyn_cast<CXXRecordDecl>(RD))
-      if (CXXRD->hasDefinition())
-        for (const auto &I : CXXRD->bases()) {
-          QualType Base = I.getType();
-
-          // Empty bases don't affect things either way.
-          if (isEmptyRecord(getContext(), Base, true))
-            continue;
-
-          if (!Found.isNull())
-            return Ty;
-          Found = GetSingleElementType(Base);
-        }
-
-    // Check the fields.
-    for (const auto *FD : RD->fields()) {
-      // Unlike isSingleElementStruct(), empty structure and array fields
-      // do count.  So do anonymous bitfields that aren't zero-sized.
-
-      // Like isSingleElementStruct(), ignore C++20 empty data members.
-      if (FD->hasAttr<NoUniqueAddressAttr>() &&
-          isEmptyRecord(getContext(), FD->getType(), true))
-        continue;
-
-      // Unlike isSingleElementStruct(), arrays do not count.
-      // Nested structures still do though.
-      if (!Found.isNull())
-        return Ty;
-      Found = GetSingleElementType(FD->getType());
-    }
-
-    // Unlike isSingleElementStruct(), trailing padding is allowed.
-    // An 8-byte aligned struct s { float f; } is passed as a double.
-    if (!Found.isNull())
-      return Found;
-  }
-
-  return Ty;
-}
-
-Address SystemZABIInfo::EmitVAArg(CodeGenFunction &CGF, Address VAListAddr,
-                                  QualType Ty) const {
-  // Assume that va_list type is correct; should be pointer to LLVM type:
-  // struct {
-  //   i64 __gpr;
-  //   i64 __fpr;
-  //   i8 *__overflow_arg_area;
-  //   i8 *__reg_save_area;
-  // };
-
-  // Every non-vector argument occupies 8 bytes and is passed by preference
-  // in either GPRs or FPRs.  Vector arguments occupy 8 or 16 bytes and are
-  // always passed on the stack.
-  const SystemZTargetCodeGenInfo &SZCGI =
-      static_cast<const SystemZTargetCodeGenInfo &>(
-          CGT.getCGM().getTargetCodeGenInfo());
-  Ty = getContext().getCanonicalType(Ty);
-  auto TyInfo = getContext().getTypeInfoInChars(Ty);
-  llvm::Type *ArgTy = CGF.ConvertTypeForMem(Ty);
-  llvm::Type *DirectTy = ArgTy;
-  ABIArgInfo AI = classifyArgumentType(Ty);
-  bool IsIndirect = AI.isIndirect();
-  bool InFPRs = false;
-  bool IsVector = false;
-  CharUnits UnpaddedSize;
-  CharUnits DirectAlign;
-  SZCGI.handleExternallyVisibleObjABI(Ty.getTypePtr(), CGT.getCGM(),
-                                      /*IsParam*/true);
-  if (IsIndirect) {
-    DirectTy = llvm::PointerType::getUnqual(DirectTy);
-    UnpaddedSize = DirectAlign = CharUnits::fromQuantity(8);
-  } else {
-    if (AI.getCoerceToType())
-      ArgTy = AI.getCoerceToType();
-    InFPRs = (!IsSoftFloatABI && (ArgTy->isFloatTy() || ArgTy->isDoubleTy()));
-    IsVector = ArgTy->isVectorTy();
-    UnpaddedSize = TyInfo.Width;
-    DirectAlign = TyInfo.Align;
-  }
-  CharUnits PaddedSize = CharUnits::fromQuantity(8);
-  if (IsVector && UnpaddedSize > PaddedSize)
-    PaddedSize = CharUnits::fromQuantity(16);
-  assert((UnpaddedSize <= PaddedSize) && "Invalid argument size.");
-
-  CharUnits Padding = (PaddedSize - UnpaddedSize);
-
-  llvm::Type *IndexTy = CGF.Int64Ty;
-  llvm::Value *PaddedSizeV =
-    llvm::ConstantInt::get(IndexTy, PaddedSize.getQuantity());
-
-  if (IsVector) {
-    // Work out the address of a vector argument on the stack.
-    // Vector arguments are always passed in the high bits of a
-    // single (8 byte) or double (16 byte) stack slot.
-    Address OverflowArgAreaPtr =
-        CGF.Builder.CreateStructGEP(VAListAddr, 2, "overflow_arg_area_ptr");
-    Address OverflowArgArea =
-        Address(CGF.Builder.CreateLoad(OverflowArgAreaPtr, "overflow_arg_area"),
-                CGF.Int8Ty, TyInfo.Align);
-    Address MemAddr =
-        CGF.Builder.CreateElementBitCast(OverflowArgArea, DirectTy, "mem_addr");
-
-    // Update overflow_arg_area_ptr pointer
-    llvm::Value *NewOverflowArgArea = CGF.Builder.CreateGEP(
-        OverflowArgArea.getElementType(), OverflowArgArea.getPointer(),
-        PaddedSizeV, "overflow_arg_area");
-    CGF.Builder.CreateStore(NewOverflowArgArea, OverflowArgAreaPtr);
-
-    return MemAddr;
-  }
-
-  assert(PaddedSize.getQuantity() == 8);
-
-  unsigned MaxRegs, RegCountField, RegSaveIndex;
-  CharUnits RegPadding;
-  if (InFPRs) {
-    MaxRegs = 4; // Maximum of 4 FPR arguments
-    RegCountField = 1; // __fpr
-    RegSaveIndex = 16; // save offset for f0
-    RegPadding = CharUnits(); // floats are passed in the high bits of an FPR
-  } else {
-    MaxRegs = 5; // Maximum of 5 GPR arguments
-    RegCountField = 0; // __gpr
-    RegSaveIndex = 2; // save offset for r2
-    RegPadding = Padding; // values are passed in the low bits of a GPR
-  }
-
-  Address RegCountPtr =
-      CGF.Builder.CreateStructGEP(VAListAddr, RegCountField, "reg_count_ptr");
-  llvm::Value *RegCount = CGF.Builder.CreateLoad(RegCountPtr, "reg_count");
-  llvm::Value *MaxRegsV = llvm::ConstantInt::get(IndexTy, MaxRegs);
-  llvm::Value *InRegs = CGF.Builder.CreateICmpULT(RegCount, MaxRegsV,
-                                                 "fits_in_regs");
-
-  llvm::BasicBlock *InRegBlock = CGF.createBasicBlock("vaarg.in_reg");
-  llvm::BasicBlock *InMemBlock = CGF.createBasicBlock("vaarg.in_mem");
-  llvm::BasicBlock *ContBlock = CGF.createBasicBlock("vaarg.end");
-  CGF.Builder.CreateCondBr(InRegs, InRegBlock, InMemBlock);
-
-  // Emit code to load the value if it was passed in registers.
-  CGF.EmitBlock(InRegBlock);
-
-  // Work out the address of an argument register.
-  llvm::Value *ScaledRegCount =
-    CGF.Builder.CreateMul(RegCount, PaddedSizeV, "scaled_reg_count");
-  llvm::Value *RegBase =
-    llvm::ConstantInt::get(IndexTy, RegSaveIndex * PaddedSize.getQuantity()
-                                      + RegPadding.getQuantity());
-  llvm::Value *RegOffset =
-    CGF.Builder.CreateAdd(ScaledRegCount, RegBase, "reg_offset");
-  Address RegSaveAreaPtr =
-      CGF.Builder.CreateStructGEP(VAListAddr, 3, "reg_save_area_ptr");
-  llvm::Value *RegSaveArea =
-      CGF.Builder.CreateLoad(RegSaveAreaPtr, "reg_save_area");
-  Address RawRegAddr(
-      CGF.Builder.CreateGEP(CGF.Int8Ty, RegSaveArea, RegOffset, "raw_reg_addr"),
-      CGF.Int8Ty, PaddedSize);
-  Address RegAddr =
-      CGF.Builder.CreateElementBitCast(RawRegAddr, DirectTy, "reg_addr");
-
-  // Update the register count
-  llvm::Value *One = llvm::ConstantInt::get(IndexTy, 1);
-  llvm::Value *NewRegCount =
-    CGF.Builder.CreateAdd(RegCount, One, "reg_count");
-  CGF.Builder.CreateStore(NewRegCount, RegCountPtr);
-  CGF.EmitBranch(ContBlock);
-
-  // Emit code to load the value if it was passed in memory.
-  CGF.EmitBlock(InMemBlock);
-
-  // Work out the address of a stack argument.
-  Address OverflowArgAreaPtr =
-      CGF.Builder.CreateStructGEP(VAListAddr, 2, "overflow_arg_area_ptr");
-  Address OverflowArgArea =
-      Address(CGF.Builder.CreateLoad(OverflowArgAreaPtr, "overflow_arg_area"),
-              CGF.Int8Ty, PaddedSize);
-  Address RawMemAddr =
-      CGF.Builder.CreateConstByteGEP(OverflowArgArea, Padding, "raw_mem_addr");
-  Address MemAddr =
-    CGF.Builder.CreateElementBitCast(RawMemAddr, DirectTy, "mem_addr");
-
-  // Update overflow_arg_area_ptr pointer
-  llvm::Value *NewOverflowArgArea =
-    CGF.Builder.CreateGEP(OverflowArgArea.getElementType(),
-                          OverflowArgArea.getPointer(), PaddedSizeV,
-                          "overflow_arg_area");
-  CGF.Builder.CreateStore(NewOverflowArgArea, OverflowArgAreaPtr);
-  CGF.EmitBranch(ContBlock);
-
-  // Return the appropriate result.
-  CGF.EmitBlock(ContBlock);
-  Address ResAddr = emitMergePHI(CGF, RegAddr, InRegBlock, MemAddr, InMemBlock,
-                                 "va_arg.addr");
-
-  if (IsIndirect)
-    ResAddr = Address(CGF.Builder.CreateLoad(ResAddr, "indirect_arg"), ArgTy,
-                      TyInfo.Align);
-
-  return ResAddr;
-}
-
-ABIArgInfo SystemZABIInfo::classifyReturnType(QualType RetTy) const {
-  if (RetTy->isVoidType())
-    return ABIArgInfo::getIgnore();
-  if (isVectorArgumentType(RetTy))
-    return ABIArgInfo::getDirect();
-  if (isCompoundType(RetTy) || getContext().getTypeSize(RetTy) > 64)
-    return getNaturalAlignIndirect(RetTy);
-  return (isPromotableIntegerTypeForABI(RetTy) ? ABIArgInfo::getExtend(RetTy)
-                                               : ABIArgInfo::getDirect());
-}
-
-ABIArgInfo SystemZABIInfo::classifyArgumentType(QualType Ty) const {
-  // Handle the generic C++ ABI.
-  if (CGCXXABI::RecordArgABI RAA = getRecordArgABI(Ty, getCXXABI()))
-    return getNaturalAlignIndirect(Ty, RAA == CGCXXABI::RAA_DirectInMemory);
-
-  // Integers and enums are extended to full register width.
-  if (isPromotableIntegerTypeForABI(Ty))
-    return ABIArgInfo::getExtend(Ty);
-
-  // Handle vector types and vector-like structure types.  Note that
-  // as opposed to float-like structure types, we do not allow any
-  // padding for vector-like structures, so verify the sizes match.
-  uint64_t Size = getContext().getTypeSize(Ty);
-  QualType SingleElementTy = GetSingleElementType(Ty);
-  if (isVectorArgumentType(SingleElementTy) &&
-      getContext().getTypeSize(SingleElementTy) == Size)
-    return ABIArgInfo::getDirect(CGT.ConvertType(SingleElementTy));
-
-  // Values that are not 1, 2, 4 or 8 bytes in size are passed indirectly.
-  if (Size != 8 && Size != 16 && Size != 32 && Size != 64)
-    return getNaturalAlignIndirect(Ty, /*ByVal=*/false);
-
-  // Handle small structures.
-  if (const RecordType *RT = Ty->getAs<RecordType>()) {
-    // Structures with flexible arrays have variable length, so really
-    // fail the size test above.
-    const RecordDecl *RD = RT->getDecl();
-    if (RD->hasFlexibleArrayMember())
-      return getNaturalAlignIndirect(Ty, /*ByVal=*/false);
-
-    // The structure is passed as an unextended integer, a float, or a double.
-    llvm::Type *PassTy;
-    if (isFPArgumentType(SingleElementTy)) {
-      assert(Size == 32 || Size == 64);
-      if (Size == 32)
-        PassTy = llvm::Type::getFloatTy(getVMContext());
-      else
-        PassTy = llvm::Type::getDoubleTy(getVMContext());
-    } else
-      PassTy = llvm::IntegerType::get(getVMContext(), Size);
-    return ABIArgInfo::getDirect(PassTy);
-  }
-
-  // Non-structure compounds are passed indirectly.
-  if (isCompoundType(Ty))
-    return getNaturalAlignIndirect(Ty, /*ByVal=*/false);
-
-  return ABIArgInfo::getDirect(nullptr);
-}
-
-void SystemZABIInfo::computeInfo(CGFunctionInfo &FI) const {
-  const SystemZTargetCodeGenInfo &SZCGI =
-      static_cast<const SystemZTargetCodeGenInfo &>(
-          CGT.getCGM().getTargetCodeGenInfo());
-  if (!getCXXABI().classifyReturnType(FI))
-    FI.getReturnInfo() = classifyReturnType(FI.getReturnType());
-  unsigned Idx = 0;
-  for (auto &I : FI.arguments()) {
-    I.info = classifyArgumentType(I.type);
-    if (FI.isVariadic() && Idx++ >= FI.getNumRequiredArgs())
-      // Check if a vararg vector argument is passed, in which case the
-      // vector ABI becomes visible as the va_list could be passed on to
-      // other functions.
-      SZCGI.handleExternallyVisibleObjABI(I.type.getTypePtr(), CGT.getCGM(),
-                                          /*IsParam*/true);
-  }
-}
-
-bool SystemZTargetCodeGenInfo::isVectorTypeBased(const Type *Ty,
-                                                 bool IsParam) const {
-  if (!SeenTypes.insert(Ty).second)
-    return false;
-
-  if (IsParam) {
-    // A narrow (<16 bytes) vector will as a parameter also expose the ABI as
-    // it will be passed in a vector register. A wide (>16 bytes) vector will
-    // be passed via "hidden" pointer where any extra alignment is not
-    // required (per GCC).
-    const Type *SingleEltTy =
-        static_cast<const SystemZABIInfo &>(TargetCodeGenInfo::getABIInfo())
-            .GetSingleElementType(QualType(Ty, 0))
-            .getTypePtr();
-    bool SingleVecEltStruct = SingleEltTy != Ty && SingleEltTy->isVectorType() &&
-      Ctx.getTypeSize(SingleEltTy) == Ctx.getTypeSize(Ty);
-    if (Ty->isVectorType() || SingleVecEltStruct)
-      return Ctx.getTypeSize(Ty) / 8 <= 16;
-  }
-
-  // Assume pointers are dereferenced.
-  while (Ty->isPointerType() || Ty->isArrayType())
-    Ty = Ty->getPointeeOrArrayElementType();
-
-  // Vectors >= 16 bytes expose the ABI through alignment requirements.
-  if (Ty->isVectorType() && Ctx.getTypeSize(Ty) / 8 >= 16)
-      return true;
-
-  if (const auto *RecordTy = Ty->getAs<RecordType>()) {
-    const RecordDecl *RD = RecordTy->getDecl();
-    if (const CXXRecordDecl *CXXRD = dyn_cast<CXXRecordDecl>(RD))
-      if (CXXRD->hasDefinition())
-        for (const auto &I : CXXRD->bases())
-          if (isVectorTypeBased(I.getType().getTypePtr(), /*IsParam*/false))
-            return true;
-    for (const auto *FD : RD->fields())
-      if (isVectorTypeBased(FD->getType().getTypePtr(), /*IsParam*/false))
-        return true;
-  }
-
-  if (const auto *FT = Ty->getAs<FunctionType>())
-    if (isVectorTypeBased(FT->getReturnType().getTypePtr(), /*IsParam*/true))
-      return true;
-  if (const FunctionProtoType *Proto = Ty->getAs<FunctionProtoType>())
-    for (const auto &ParamType : Proto->getParamTypes())
-      if (isVectorTypeBased(ParamType.getTypePtr(), /*IsParam*/true))
-        return true;
-
-  return false;
-}
-
-//===----------------------------------------------------------------------===//
-// MSP430 ABI Implementation
-//===----------------------------------------------------------------------===//
-
-namespace {
-
-class MSP430ABIInfo : public DefaultABIInfo {
-  static ABIArgInfo complexArgInfo() {
-    ABIArgInfo Info = ABIArgInfo::getDirect();
-    Info.setCanBeFlattened(false);
-    return Info;
-  }
-
-public:
-  MSP430ABIInfo(CodeGenTypes &CGT) : DefaultABIInfo(CGT) {}
-
-  ABIArgInfo classifyReturnType(QualType RetTy) const {
-    if (RetTy->isAnyComplexType())
-      return complexArgInfo();
-
-    return DefaultABIInfo::classifyReturnType(RetTy);
-  }
-
-  ABIArgInfo classifyArgumentType(QualType RetTy) const {
-    if (RetTy->isAnyComplexType())
-      return complexArgInfo();
-
-    return DefaultABIInfo::classifyArgumentType(RetTy);
-  }
-
-  // Just copy the original implementations because
-  // DefaultABIInfo::classify{Return,Argument}Type() are not virtual
-  void computeInfo(CGFunctionInfo &FI) const override {
-    if (!getCXXABI().classifyReturnType(FI))
-      FI.getReturnInfo() = classifyReturnType(FI.getReturnType());
-    for (auto &I : FI.arguments())
-      I.info = classifyArgumentType(I.type);
-  }
-
-  Address EmitVAArg(CodeGenFunction &CGF, Address VAListAddr,
-                    QualType Ty) const override {
-    return EmitVAArgInstr(CGF, VAListAddr, Ty, classifyArgumentType(Ty));
-  }
-};
-
-class MSP430TargetCodeGenInfo : public TargetCodeGenInfo {
-public:
-  MSP430TargetCodeGenInfo(CodeGenTypes &CGT)
-      : TargetCodeGenInfo(std::make_unique<MSP430ABIInfo>(CGT)) {}
-  void setTargetAttributes(const Decl *D, llvm::GlobalValue *GV,
-                           CodeGen::CodeGenModule &M) const override;
-};
-
-}
-
-void MSP430TargetCodeGenInfo::setTargetAttributes(
-    const Decl *D, llvm::GlobalValue *GV, CodeGen::CodeGenModule &M) const {
-  if (GV->isDeclaration())
-    return;
-  if (const FunctionDecl *FD = dyn_cast_or_null<FunctionDecl>(D)) {
-    const auto *InterruptAttr = FD->getAttr<MSP430InterruptAttr>();
-    if (!InterruptAttr)
-      return;
-
-    // Handle 'interrupt' attribute:
-    llvm::Function *F = cast<llvm::Function>(GV);
-
-    // Step 1: Set ISR calling convention.
-    F->setCallingConv(llvm::CallingConv::MSP430_INTR);
-
-    // Step 2: Add attributes goodness.
-    F->addFnAttr(llvm::Attribute::NoInline);
-    F->addFnAttr("interrupt", llvm::utostr(InterruptAttr->getNumber()));
-  }
-}
-
-//===----------------------------------------------------------------------===//
-// MIPS ABI Implementation.  This works for both little-endian and
-// big-endian variants.
-//===----------------------------------------------------------------------===//
-
-namespace {
-class MipsABIInfo : public ABIInfo {
-  bool IsO32;
-  const unsigned MinABIStackAlignInBytes, StackAlignInBytes;
-  void CoerceToIntArgs(uint64_t TySize,
-                       SmallVectorImpl<llvm::Type *> &ArgList) const;
-  llvm::Type* HandleAggregates(QualType Ty, uint64_t TySize) const;
-  llvm::Type* returnAggregateInRegs(QualType RetTy, uint64_t Size) const;
-  llvm::Type* getPaddingType(uint64_t Align, uint64_t Offset) const;
-public:
-  MipsABIInfo(CodeGenTypes &CGT, bool _IsO32) :
-    ABIInfo(CGT), IsO32(_IsO32), MinABIStackAlignInBytes(IsO32 ? 4 : 8),
-    StackAlignInBytes(IsO32 ? 8 : 16) {}
-
-  ABIArgInfo classifyReturnType(QualType RetTy) const;
-  ABIArgInfo classifyArgumentType(QualType RetTy, uint64_t &Offset) const;
-  void computeInfo(CGFunctionInfo &FI) const override;
-  Address EmitVAArg(CodeGenFunction &CGF, Address VAListAddr,
-                    QualType Ty) const override;
-  ABIArgInfo extendType(QualType Ty) const;
-};
-
-class MIPSTargetCodeGenInfo : public TargetCodeGenInfo {
-  unsigned SizeOfUnwindException;
-public:
-  MIPSTargetCodeGenInfo(CodeGenTypes &CGT, bool IsO32)
-      : TargetCodeGenInfo(std::make_unique<MipsABIInfo>(CGT, IsO32)),
-        SizeOfUnwindException(IsO32 ? 24 : 32) {}
-
-  int getDwarfEHStackPointer(CodeGen::CodeGenModule &CGM) const override {
-    return 29;
-  }
-
-  void setTargetAttributes(const Decl *D, llvm::GlobalValue *GV,
-                           CodeGen::CodeGenModule &CGM) const override {
-    const FunctionDecl *FD = dyn_cast_or_null<FunctionDecl>(D);
-    if (!FD) return;
-    llvm::Function *Fn = cast<llvm::Function>(GV);
-
-    if (FD->hasAttr<MipsLongCallAttr>())
-      Fn->addFnAttr("long-call");
-    else if (FD->hasAttr<MipsShortCallAttr>())
-      Fn->addFnAttr("short-call");
-
-    // Other attributes do not have a meaning for declarations.
-    if (GV->isDeclaration())
-      return;
-
-    if (FD->hasAttr<Mips16Attr>()) {
-      Fn->addFnAttr("mips16");
-    }
-    else if (FD->hasAttr<NoMips16Attr>()) {
-      Fn->addFnAttr("nomips16");
-    }
-
-    if (FD->hasAttr<MicroMipsAttr>())
-      Fn->addFnAttr("micromips");
-    else if (FD->hasAttr<NoMicroMipsAttr>())
-      Fn->addFnAttr("nomicromips");
-
-    const MipsInterruptAttr *Attr = FD->getAttr<MipsInterruptAttr>();
-    if (!Attr)
-      return;
-
-    const char *Kind;
-    switch (Attr->getInterrupt()) {
-    case MipsInterruptAttr::eic:     Kind = "eic"; break;
-    case MipsInterruptAttr::sw0:     Kind = "sw0"; break;
-    case MipsInterruptAttr::sw1:     Kind = "sw1"; break;
-    case MipsInterruptAttr::hw0:     Kind = "hw0"; break;
-    case MipsInterruptAttr::hw1:     Kind = "hw1"; break;
-    case MipsInterruptAttr::hw2:     Kind = "hw2"; break;
-    case MipsInterruptAttr::hw3:     Kind = "hw3"; break;
-    case MipsInterruptAttr::hw4:     Kind = "hw4"; break;
-    case MipsInterruptAttr::hw5:     Kind = "hw5"; break;
-    }
-
-    Fn->addFnAttr("interrupt", Kind);
-
-  }
-
-  bool initDwarfEHRegSizeTable(CodeGen::CodeGenFunction &CGF,
-                               llvm::Value *Address) const override;
-
-  unsigned getSizeOfUnwindException() const override {
-    return SizeOfUnwindException;
-  }
-};
-}
-
-void MipsABIInfo::CoerceToIntArgs(
-    uint64_t TySize, SmallVectorImpl<llvm::Type *> &ArgList) const {
-  llvm::IntegerType *IntTy =
-    llvm::IntegerType::get(getVMContext(), MinABIStackAlignInBytes * 8);
-
-  // Add (TySize / MinABIStackAlignInBytes) args of IntTy.
-  for (unsigned N = TySize / (MinABIStackAlignInBytes * 8); N; --N)
-    ArgList.push_back(IntTy);
-
-  // If necessary, add one more integer type to ArgList.
-  unsigned R = TySize % (MinABIStackAlignInBytes * 8);
-
-  if (R)
-    ArgList.push_back(llvm::IntegerType::get(getVMContext(), R));
-}
-
-// In N32/64, an aligned double precision floating point field is passed in
-// a register.
-llvm::Type* MipsABIInfo::HandleAggregates(QualType Ty, uint64_t TySize) const {
-  SmallVector<llvm::Type*, 8> ArgList, IntArgList;
-
-  if (IsO32) {
-    CoerceToIntArgs(TySize, ArgList);
-    return llvm::StructType::get(getVMContext(), ArgList);
-  }
-
-  if (Ty->isComplexType())
-    return CGT.ConvertType(Ty);
-
-  const RecordType *RT = Ty->getAs<RecordType>();
-
-  // Unions/vectors are passed in integer registers.
-  if (!RT || !RT->isStructureOrClassType()) {
-    CoerceToIntArgs(TySize, ArgList);
-    return llvm::StructType::get(getVMContext(), ArgList);
-  }
-
-  const RecordDecl *RD = RT->getDecl();
-  const ASTRecordLayout &Layout = getContext().getASTRecordLayout(RD);
-  assert(!(TySize % 8) && "Size of structure must be multiple of 8.");
-
-  uint64_t LastOffset = 0;
-  unsigned idx = 0;
-  llvm::IntegerType *I64 = llvm::IntegerType::get(getVMContext(), 64);
-
-  // Iterate over fields in the struct/class and check if there are any aligned
-  // double fields.
-  for (RecordDecl::field_iterator i = RD->field_begin(), e = RD->field_end();
-       i != e; ++i, ++idx) {
-    const QualType Ty = i->getType();
-    const BuiltinType *BT = Ty->getAs<BuiltinType>();
-
-    if (!BT || BT->getKind() != BuiltinType::Double)
-      continue;
-
-    uint64_t Offset = Layout.getFieldOffset(idx);
-    if (Offset % 64) // Ignore doubles that are not aligned.
-      continue;
-
-    // Add ((Offset - LastOffset) / 64) args of type i64.
-    for (unsigned j = (Offset - LastOffset) / 64; j > 0; --j)
-      ArgList.push_back(I64);
-
-    // Add double type.
-    ArgList.push_back(llvm::Type::getDoubleTy(getVMContext()));
-    LastOffset = Offset + 64;
-  }
-
-  CoerceToIntArgs(TySize - LastOffset, IntArgList);
-  ArgList.append(IntArgList.begin(), IntArgList.end());
-
-  return llvm::StructType::get(getVMContext(), ArgList);
-}
-
-llvm::Type *MipsABIInfo::getPaddingType(uint64_t OrigOffset,
-                                        uint64_t Offset) const {
-  if (OrigOffset + MinABIStackAlignInBytes > Offset)
-    return nullptr;
-
-  return llvm::IntegerType::get(getVMContext(), (Offset - OrigOffset) * 8);
-}
-
-ABIArgInfo
-MipsABIInfo::classifyArgumentType(QualType Ty, uint64_t &Offset) const {
-  Ty = useFirstFieldIfTransparentUnion(Ty);
-
-  uint64_t OrigOffset = Offset;
-  uint64_t TySize = getContext().getTypeSize(Ty);
-  uint64_t Align = getContext().getTypeAlign(Ty) / 8;
-
-  Align = std::clamp(Align, (uint64_t)MinABIStackAlignInBytes,
-                     (uint64_t)StackAlignInBytes);
-  unsigned CurrOffset = llvm::alignTo(Offset, Align);
-  Offset = CurrOffset + llvm::alignTo(TySize, Align * 8) / 8;
-
-  if (isAggregateTypeForABI(Ty) || Ty->isVectorType()) {
-    // Ignore empty aggregates.
-    if (TySize == 0)
-      return ABIArgInfo::getIgnore();
-
-    if (CGCXXABI::RecordArgABI RAA = getRecordArgABI(Ty, getCXXABI())) {
-      Offset = OrigOffset + MinABIStackAlignInBytes;
-      return getNaturalAlignIndirect(Ty, RAA == CGCXXABI::RAA_DirectInMemory);
-    }
-
-    // If we have reached here, aggregates are passed directly by coercing to
-    // another structure type. Padding is inserted if the offset of the
-    // aggregate is unaligned.
-    ABIArgInfo ArgInfo =
-        ABIArgInfo::getDirect(HandleAggregates(Ty, TySize), 0,
-                              getPaddingType(OrigOffset, CurrOffset));
-    ArgInfo.setInReg(true);
-    return ArgInfo;
-  }
-
-  // Treat an enum type as its underlying type.
-  if (const EnumType *EnumTy = Ty->getAs<EnumType>())
-    Ty = EnumTy->getDecl()->getIntegerType();
-
-  // Make sure we pass indirectly things that are too large.
-  if (const auto *EIT = Ty->getAs<BitIntType>())
-    if (EIT->getNumBits() > 128 ||
-        (EIT->getNumBits() > 64 &&
-         !getContext().getTargetInfo().hasInt128Type()))
-      return getNaturalAlignIndirect(Ty);
-
-  // All integral types are promoted to the GPR width.
-  if (Ty->isIntegralOrEnumerationType())
-    return extendType(Ty);
-
-  return ABIArgInfo::getDirect(
-      nullptr, 0, IsO32 ? nullptr : getPaddingType(OrigOffset, CurrOffset));
-}
-
-llvm::Type*
-MipsABIInfo::returnAggregateInRegs(QualType RetTy, uint64_t Size) const {
-  const RecordType *RT = RetTy->getAs<RecordType>();
-  SmallVector<llvm::Type*, 8> RTList;
-
-  if (RT && RT->isStructureOrClassType()) {
-    const RecordDecl *RD = RT->getDecl();
-    const ASTRecordLayout &Layout = getContext().getASTRecordLayout(RD);
-    unsigned FieldCnt = Layout.getFieldCount();
-
-    // N32/64 returns struct/classes in floating point registers if the
-    // following conditions are met:
-    // 1. The size of the struct/class is no larger than 128-bit.
-    // 2. The struct/class has one or two fields all of which are floating
-    //    point types.
-    // 3. The offset of the first field is zero (this follows what gcc does).
-    //
-    // Any other composite results are returned in integer registers.
-    //
-    if (FieldCnt && (FieldCnt <= 2) && !Layout.getFieldOffset(0)) {
-      RecordDecl::field_iterator b = RD->field_begin(), e = RD->field_end();
-      for (; b != e; ++b) {
-        const BuiltinType *BT = b->getType()->getAs<BuiltinType>();
-
-        if (!BT || !BT->isFloatingPoint())
-          break;
-
-        RTList.push_back(CGT.ConvertType(b->getType()));
-      }
-
-      if (b == e)
-        return llvm::StructType::get(getVMContext(), RTList,
-                                     RD->hasAttr<PackedAttr>());
-
-      RTList.clear();
-    }
-  }
-
-  CoerceToIntArgs(Size, RTList);
-  return llvm::StructType::get(getVMContext(), RTList);
-}
-
-ABIArgInfo MipsABIInfo::classifyReturnType(QualType RetTy) const {
-  uint64_t Size = getContext().getTypeSize(RetTy);
-
-  if (RetTy->isVoidType())
-    return ABIArgInfo::getIgnore();
-
-  // O32 doesn't treat zero-sized structs differently from other structs.
-  // However, N32/N64 ignores zero sized return values.
-  if (!IsO32 && Size == 0)
-    return ABIArgInfo::getIgnore();
-
-  if (isAggregateTypeForABI(RetTy) || RetTy->isVectorType()) {
-    if (Size <= 128) {
-      if (RetTy->isAnyComplexType())
-        return ABIArgInfo::getDirect();
-
-      // O32 returns integer vectors in registers and N32/N64 returns all small
-      // aggregates in registers.
-      if (!IsO32 ||
-          (RetTy->isVectorType() && !RetTy->hasFloatingRepresentation())) {
-        ABIArgInfo ArgInfo =
-            ABIArgInfo::getDirect(returnAggregateInRegs(RetTy, Size));
-        ArgInfo.setInReg(true);
-        return ArgInfo;
-      }
-    }
-
-    return getNaturalAlignIndirect(RetTy);
-  }
-
-  // Treat an enum type as its underlying type.
-  if (const EnumType *EnumTy = RetTy->getAs<EnumType>())
-    RetTy = EnumTy->getDecl()->getIntegerType();
-
-  // Make sure we pass indirectly things that are too large.
-  if (const auto *EIT = RetTy->getAs<BitIntType>())
-    if (EIT->getNumBits() > 128 ||
-        (EIT->getNumBits() > 64 &&
-         !getContext().getTargetInfo().hasInt128Type()))
-      return getNaturalAlignIndirect(RetTy);
-
-  if (isPromotableIntegerTypeForABI(RetTy))
-    return ABIArgInfo::getExtend(RetTy);
-
-  if ((RetTy->isUnsignedIntegerOrEnumerationType() ||
-      RetTy->isSignedIntegerOrEnumerationType()) && Size == 32 && !IsO32)
-    return ABIArgInfo::getSignExtend(RetTy);
-
-  return ABIArgInfo::getDirect();
-}
-
-void MipsABIInfo::computeInfo(CGFunctionInfo &FI) const {
-  ABIArgInfo &RetInfo = FI.getReturnInfo();
-  if (!getCXXABI().classifyReturnType(FI))
-    RetInfo = classifyReturnType(FI.getReturnType());
-
-  // Check if a pointer to an aggregate is passed as a hidden argument.
-  uint64_t Offset = RetInfo.isIndirect() ? MinABIStackAlignInBytes : 0;
-
-  for (auto &I : FI.arguments())
-    I.info = classifyArgumentType(I.type, Offset);
-}
-
-Address MipsABIInfo::EmitVAArg(CodeGenFunction &CGF, Address VAListAddr,
-                               QualType OrigTy) const {
-  QualType Ty = OrigTy;
-
-  // Integer arguments are promoted to 32-bit on O32 and 64-bit on N32/N64.
-  // Pointers are also promoted in the same way but this only matters for N32.
-  unsigned SlotSizeInBits = IsO32 ? 32 : 64;
-  unsigned PtrWidth = getTarget().getPointerWidth(LangAS::Default);
-  bool DidPromote = false;
-  if ((Ty->isIntegerType() &&
-          getContext().getIntWidth(Ty) < SlotSizeInBits) ||
-      (Ty->isPointerType() && PtrWidth < SlotSizeInBits)) {
-    DidPromote = true;
-    Ty = getContext().getIntTypeForBitwidth(SlotSizeInBits,
-                                            Ty->isSignedIntegerType());
-  }
-
-  auto TyInfo = getContext().getTypeInfoInChars(Ty);
-
-  // The alignment of things in the argument area is never larger than
-  // StackAlignInBytes.
-  TyInfo.Align =
-    std::min(TyInfo.Align, CharUnits::fromQuantity(StackAlignInBytes));
-
-  // MinABIStackAlignInBytes is the size of argument slots on the stack.
-  CharUnits ArgSlotSize = CharUnits::fromQuantity(MinABIStackAlignInBytes);
-
-  Address Addr = emitVoidPtrVAArg(CGF, VAListAddr, Ty, /*indirect*/ false,
-                          TyInfo, ArgSlotSize, /*AllowHigherAlign*/ true);
-
-
-  // If there was a promotion, "unpromote" into a temporary.
-  // TODO: can we just use a pointer into a subset of the original slot?
-  if (DidPromote) {
-    Address Temp = CGF.CreateMemTemp(OrigTy, "vaarg.promotion-temp");
-    llvm::Value *Promoted = CGF.Builder.CreateLoad(Addr);
-
-    // Truncate down to the right width.
-    llvm::Type *IntTy = (OrigTy->isIntegerType() ? Temp.getElementType()
-                                                 : CGF.IntPtrTy);
-    llvm::Value *V = CGF.Builder.CreateTrunc(Promoted, IntTy);
-    if (OrigTy->isPointerType())
-      V = CGF.Builder.CreateIntToPtr(V, Temp.getElementType());
-
-    CGF.Builder.CreateStore(V, Temp);
-    Addr = Temp;
-  }
-
-  return Addr;
-}
-
-ABIArgInfo MipsABIInfo::extendType(QualType Ty) const {
-  int TySize = getContext().getTypeSize(Ty);
-
-  // MIPS64 ABI requires unsigned 32 bit integers to be sign extended.
-  if (Ty->isUnsignedIntegerOrEnumerationType() && TySize == 32)
-    return ABIArgInfo::getSignExtend(Ty);
-
-  return ABIArgInfo::getExtend(Ty);
-}
-
-bool
-MIPSTargetCodeGenInfo::initDwarfEHRegSizeTable(CodeGen::CodeGenFunction &CGF,
-                                               llvm::Value *Address) const {
-  // This information comes from gcc's implementation, which seems to
-  // as canonical as it gets.
-
-  // Everything on MIPS is 4 bytes.  Double-precision FP registers
-  // are aliased to pairs of single-precision FP registers.
-  llvm::Value *Four8 = llvm::ConstantInt::get(CGF.Int8Ty, 4);
-
-  // 0-31 are the general purpose registers, $0 - $31.
-  // 32-63 are the floating-point registers, $f0 - $f31.
-  // 64 and 65 are the multiply/divide registers, $hi and $lo.
-  // 66 is the (notional, I think) register for signal-handler return.
-  AssignToArrayRange(CGF.Builder, Address, Four8, 0, 65);
-
-  // 67-74 are the floating-point status registers, $fcc0 - $fcc7.
-  // They are one bit wide and ignored here.
-
-  // 80-111 are the coprocessor 0 registers, $c0r0 - $c0r31.
-  // (coprocessor 1 is the FP unit)
-  // 112-143 are the coprocessor 2 registers, $c2r0 - $c2r31.
-  // 144-175 are the coprocessor 3 registers, $c3r0 - $c3r31.
-  // 176-181 are the DSP accumulator registers.
-  AssignToArrayRange(CGF.Builder, Address, Four8, 80, 181);
-  return false;
-}
-
-//===----------------------------------------------------------------------===//
-// M68k ABI Implementation
-//===----------------------------------------------------------------------===//
-
-namespace {
-
-class M68kTargetCodeGenInfo : public TargetCodeGenInfo {
-public:
-  M68kTargetCodeGenInfo(CodeGenTypes &CGT)
-      : TargetCodeGenInfo(std::make_unique<DefaultABIInfo>(CGT)) {}
-  void setTargetAttributes(const Decl *D, llvm::GlobalValue *GV,
-                           CodeGen::CodeGenModule &M) const override;
-};
-
-} // namespace
-
-void M68kTargetCodeGenInfo::setTargetAttributes(
-    const Decl *D, llvm::GlobalValue *GV, CodeGen::CodeGenModule &M) const {
-  if (const auto *FD = dyn_cast_or_null<FunctionDecl>(D)) {
-    if (const auto *attr = FD->getAttr<M68kInterruptAttr>()) {
-      // Handle 'interrupt' attribute:
-      llvm::Function *F = cast<llvm::Function>(GV);
-
-      // Step 1: Set ISR calling convention.
-      F->setCallingConv(llvm::CallingConv::M68k_INTR);
-
-      // Step 2: Add attributes goodness.
-      F->addFnAttr(llvm::Attribute::NoInline);
-
-      // Step 3: Emit ISR vector alias.
-      unsigned Num = attr->getNumber() / 2;
-      llvm::GlobalAlias::create(llvm::Function::ExternalLinkage,
-                                "__isr_" + Twine(Num), F);
-    }
-  }
-}
-
-//===----------------------------------------------------------------------===//
-// AVR ABI Implementation. Documented at
-// https://gcc.gnu.org/wiki/avr-gcc#Calling_Convention
-// https://gcc.gnu.org/wiki/avr-gcc#Reduced_Tiny
-//===----------------------------------------------------------------------===//
-
-namespace {
-class AVRABIInfo : public DefaultABIInfo {
-private:
-  // The total amount of registers can be used to pass parameters. It is 18 on
-  // AVR, or 6 on AVRTiny.
-  const unsigned ParamRegs;
-  // The total amount of registers can be used to pass return value. It is 8 on
-  // AVR, or 4 on AVRTiny.
-  const unsigned RetRegs;
-
-public:
-  AVRABIInfo(CodeGenTypes &CGT, unsigned NPR, unsigned NRR)
-      : DefaultABIInfo(CGT), ParamRegs(NPR), RetRegs(NRR) {}
-
-  ABIArgInfo classifyReturnType(QualType Ty, bool &LargeRet) const {
-    // On AVR, a return struct with size less than or equals to 8 bytes is
-    // returned directly via registers R18-R25. On AVRTiny, a return struct
-    // with size less than or equals to 4 bytes is returned directly via
-    // registers R22-R25.
-    if (isAggregateTypeForABI(Ty) &&
-        getContext().getTypeSize(Ty) <= RetRegs * 8)
-      return ABIArgInfo::getDirect();
-    // A return value (struct or scalar) with larger size is returned via a
-    // stack slot, along with a pointer as the function's implicit argument.
-    if (getContext().getTypeSize(Ty) > RetRegs * 8) {
-      LargeRet = true;
-      return getNaturalAlignIndirect(Ty);
-    }
-    // An i8 return value should not be extended to i16, since AVR has 8-bit
-    // registers.
-    if (Ty->isIntegralOrEnumerationType() && getContext().getTypeSize(Ty) <= 8)
-      return ABIArgInfo::getDirect();
-    // Otherwise we follow the default way which is compatible.
-    return DefaultABIInfo::classifyReturnType(Ty);
-  }
-
-  ABIArgInfo classifyArgumentType(QualType Ty, unsigned &NumRegs) const {
-    unsigned TySize = getContext().getTypeSize(Ty);
-
-    // An int8 type argument always costs two registers like an int16.
-    if (TySize == 8 && NumRegs >= 2) {
-      NumRegs -= 2;
-      return ABIArgInfo::getExtend(Ty);
-    }
-
-    // If the argument size is an odd number of bytes, round up the size
-    // to the next even number.
-    TySize = llvm::alignTo(TySize, 16);
-
-    // Any type including an array/struct type can be passed in rgisters,
-    // if there are enough registers left.
-    if (TySize <= NumRegs * 8) {
-      NumRegs -= TySize / 8;
-      return ABIArgInfo::getDirect();
-    }
-
-    // An argument is passed either completely in registers or completely in
-    // memory. Since there are not enough registers left, current argument
-    // and all other unprocessed arguments should be passed in memory.
-    // However we still need to return `ABIArgInfo::getDirect()` other than
-    // `ABIInfo::getNaturalAlignIndirect(Ty)`, otherwise an extra stack slot
-    // will be allocated, so the stack frame layout will be incompatible with
-    // avr-gcc.
-    NumRegs = 0;
-    return ABIArgInfo::getDirect();
-  }
-
-  void computeInfo(CGFunctionInfo &FI) const override {
-    // Decide the return type.
-    bool LargeRet = false;
-    if (!getCXXABI().classifyReturnType(FI))
-      FI.getReturnInfo() = classifyReturnType(FI.getReturnType(), LargeRet);
-
-    // Decide each argument type. The total number of registers can be used for
-    // arguments depends on several factors:
-    // 1. Arguments of varargs functions are passed on the stack. This applies
-    //    even to the named arguments. So no register can be used.
-    // 2. Total 18 registers can be used on avr and 6 ones on avrtiny.
-    // 3. If the return type is a struct with too large size, two registers
-    //    (out of 18/6) will be cost as an implicit pointer argument.
-    unsigned NumRegs = ParamRegs;
-    if (FI.isVariadic())
-      NumRegs = 0;
-    else if (LargeRet)
-      NumRegs -= 2;
-    for (auto &I : FI.arguments())
-      I.info = classifyArgumentType(I.type, NumRegs);
-  }
-};
-
-class AVRTargetCodeGenInfo : public TargetCodeGenInfo {
-public:
-  AVRTargetCodeGenInfo(CodeGenTypes &CGT, unsigned NPR, unsigned NRR)
-      : TargetCodeGenInfo(std::make_unique<AVRABIInfo>(CGT, NPR, NRR)) {}
-
-  LangAS getGlobalVarAddressSpace(CodeGenModule &CGM,
-                                  const VarDecl *D) const override {
-    // Check if global/static variable is defined in address space
-    // 1~6 (__flash, __flash1, __flash2, __flash3, __flash4, __flash5)
-    // but not constant.
-    if (D) {
-      LangAS AS = D->getType().getAddressSpace();
-      if (isTargetAddressSpace(AS) && 1 <= toTargetAddressSpace(AS) &&
-          toTargetAddressSpace(AS) <= 6 && !D->getType().isConstQualified())
-        CGM.getDiags().Report(D->getLocation(),
-                              diag::err_verify_nonconst_addrspace)
-            << "__flash*";
-    }
-    return TargetCodeGenInfo::getGlobalVarAddressSpace(CGM, D);
-  }
-
-  void setTargetAttributes(const Decl *D, llvm::GlobalValue *GV,
-                           CodeGen::CodeGenModule &CGM) const override {
-    if (GV->isDeclaration())
-      return;
-    const auto *FD = dyn_cast_or_null<FunctionDecl>(D);
-    if (!FD) return;
-    auto *Fn = cast<llvm::Function>(GV);
-
-    if (FD->getAttr<AVRInterruptAttr>())
-      Fn->addFnAttr("interrupt");
-
-    if (FD->getAttr<AVRSignalAttr>())
-      Fn->addFnAttr("signal");
-  }
-};
-}
-
-//===----------------------------------------------------------------------===//
-// TCE ABI Implementation (see http://tce.cs.tut.fi). Uses mostly the defaults.
-// Currently subclassed only to implement custom OpenCL C function attribute
-// handling.
-//===----------------------------------------------------------------------===//
-
-namespace {
-
-class TCETargetCodeGenInfo : public TargetCodeGenInfo {
-public:
-  TCETargetCodeGenInfo(CodeGenTypes &CGT)
-      : TargetCodeGenInfo(std::make_unique<DefaultABIInfo>(CGT)) {}
-
-  void setTargetAttributes(const Decl *D, llvm::GlobalValue *GV,
-                           CodeGen::CodeGenModule &M) const override;
-};
-
-void TCETargetCodeGenInfo::setTargetAttributes(
-    const Decl *D, llvm::GlobalValue *GV, CodeGen::CodeGenModule &M) const {
-  if (GV->isDeclaration())
-    return;
-  const FunctionDecl *FD = dyn_cast_or_null<FunctionDecl>(D);
-  if (!FD) return;
-
-  llvm::Function *F = cast<llvm::Function>(GV);
-
-  if (M.getLangOpts().OpenCL) {
-    if (FD->hasAttr<OpenCLKernelAttr>()) {
-      // OpenCL C Kernel functions are not subject to inlining
-      F->addFnAttr(llvm::Attribute::NoInline);
-      const ReqdWorkGroupSizeAttr *Attr = FD->getAttr<ReqdWorkGroupSizeAttr>();
-      if (Attr) {
-        // Convert the reqd_work_group_size() attributes to metadata.
-        llvm::LLVMContext &Context = F->getContext();
-        llvm::NamedMDNode *OpenCLMetadata =
-            M.getModule().getOrInsertNamedMetadata(
-                "opencl.kernel_wg_size_info");
-
-        SmallVector<llvm::Metadata *, 5> Operands;
-        Operands.push_back(llvm::ConstantAsMetadata::get(F));
-
-        Operands.push_back(
-            llvm::ConstantAsMetadata::get(llvm::Constant::getIntegerValue(
-                M.Int32Ty, llvm::APInt(32, Attr->getXDim()))));
-        Operands.push_back(
-            llvm::ConstantAsMetadata::get(llvm::Constant::getIntegerValue(
-                M.Int32Ty, llvm::APInt(32, Attr->getYDim()))));
-        Operands.push_back(
-            llvm::ConstantAsMetadata::get(llvm::Constant::getIntegerValue(
-                M.Int32Ty, llvm::APInt(32, Attr->getZDim()))));
-
-        // Add a boolean constant operand for "required" (true) or "hint"
-        // (false) for implementing the work_group_size_hint attr later.
-        // Currently always true as the hint is not yet implemented.
-        Operands.push_back(
-            llvm::ConstantAsMetadata::get(llvm::ConstantInt::getTrue(Context)));
-        OpenCLMetadata->addOperand(llvm::MDNode::get(Context, Operands));
-      }
-    }
-  }
-}
-
-}
-
-//===----------------------------------------------------------------------===//
-// Hexagon ABI Implementation
-//===----------------------------------------------------------------------===//
-
-namespace {
-
-class HexagonABIInfo : public DefaultABIInfo {
-public:
-  HexagonABIInfo(CodeGenTypes &CGT) : DefaultABIInfo(CGT) {}
-
-private:
-  ABIArgInfo classifyReturnType(QualType RetTy) const;
-  ABIArgInfo classifyArgumentType(QualType RetTy) const;
-  ABIArgInfo classifyArgumentType(QualType RetTy, unsigned *RegsLeft) const;
-
-  void computeInfo(CGFunctionInfo &FI) const override;
-
-  Address EmitVAArg(CodeGenFunction &CGF, Address VAListAddr,
-                    QualType Ty) const override;
-  Address EmitVAArgFromMemory(CodeGenFunction &CFG, Address VAListAddr,
-                              QualType Ty) const;
-  Address EmitVAArgForHexagon(CodeGenFunction &CFG, Address VAListAddr,
-                              QualType Ty) const;
-  Address EmitVAArgForHexagonLinux(CodeGenFunction &CFG, Address VAListAddr,
-                                   QualType Ty) const;
-};
-
-class HexagonTargetCodeGenInfo : public TargetCodeGenInfo {
-public:
-  HexagonTargetCodeGenInfo(CodeGenTypes &CGT)
-      : TargetCodeGenInfo(std::make_unique<HexagonABIInfo>(CGT)) {}
-
-  int getDwarfEHStackPointer(CodeGen::CodeGenModule &M) const override {
-    return 29;
-  }
-
-  void setTargetAttributes(const Decl *D, llvm::GlobalValue *GV,
-                           CodeGen::CodeGenModule &GCM) const override {
-    if (GV->isDeclaration())
-      return;
-    const FunctionDecl *FD = dyn_cast_or_null<FunctionDecl>(D);
-    if (!FD)
-      return;
-  }
-};
-
-} // namespace
-
-void HexagonABIInfo::computeInfo(CGFunctionInfo &FI) const {
-  unsigned RegsLeft = 6;
-  if (!getCXXABI().classifyReturnType(FI))
-    FI.getReturnInfo() = classifyReturnType(FI.getReturnType());
-  for (auto &I : FI.arguments())
-    I.info = classifyArgumentType(I.type, &RegsLeft);
-}
-
-static bool HexagonAdjustRegsLeft(uint64_t Size, unsigned *RegsLeft) {
-  assert(Size <= 64 && "Not expecting to pass arguments larger than 64 bits"
-                       " through registers");
-
-  if (*RegsLeft == 0)
-    return false;
-
-  if (Size <= 32) {
-    (*RegsLeft)--;
-    return true;
-  }
-
-  if (2 <= (*RegsLeft & (~1U))) {
-    *RegsLeft = (*RegsLeft & (~1U)) - 2;
-    return true;
-  }
-
-  // Next available register was r5 but candidate was greater than 32-bits so it
-  // has to go on the stack. However we still consume r5
-  if (*RegsLeft == 1)
-    *RegsLeft = 0;
-
-  return false;
-}
-
-ABIArgInfo HexagonABIInfo::classifyArgumentType(QualType Ty,
-                                                unsigned *RegsLeft) const {
-  if (!isAggregateTypeForABI(Ty)) {
-    // Treat an enum type as its underlying type.
-    if (const EnumType *EnumTy = Ty->getAs<EnumType>())
-      Ty = EnumTy->getDecl()->getIntegerType();
-
-    uint64_t Size = getContext().getTypeSize(Ty);
-    if (Size <= 64)
-      HexagonAdjustRegsLeft(Size, RegsLeft);
-
-    if (Size > 64 && Ty->isBitIntType())
-      return getNaturalAlignIndirect(Ty, /*ByVal=*/true);
-
-    return isPromotableIntegerTypeForABI(Ty) ? ABIArgInfo::getExtend(Ty)
-                                             : ABIArgInfo::getDirect();
-  }
-
-  if (CGCXXABI::RecordArgABI RAA = getRecordArgABI(Ty, getCXXABI()))
-    return getNaturalAlignIndirect(Ty, RAA == CGCXXABI::RAA_DirectInMemory);
-
-  // Ignore empty records.
-  if (isEmptyRecord(getContext(), Ty, true))
-    return ABIArgInfo::getIgnore();
-
-  uint64_t Size = getContext().getTypeSize(Ty);
-  unsigned Align = getContext().getTypeAlign(Ty);
-
-  if (Size > 64)
-    return getNaturalAlignIndirect(Ty, /*ByVal=*/true);
-
-  if (HexagonAdjustRegsLeft(Size, RegsLeft))
-    Align = Size <= 32 ? 32 : 64;
-  if (Size <= Align) {
-    // Pass in the smallest viable integer type.
-    Size = llvm::bit_ceil(Size);
-    return ABIArgInfo::getDirect(llvm::Type::getIntNTy(getVMContext(), Size));
-  }
-  return DefaultABIInfo::classifyArgumentType(Ty);
-}
-
-ABIArgInfo HexagonABIInfo::classifyReturnType(QualType RetTy) const {
-  if (RetTy->isVoidType())
-    return ABIArgInfo::getIgnore();
-
-  const TargetInfo &T = CGT.getTarget();
-  uint64_t Size = getContext().getTypeSize(RetTy);
-
-  if (RetTy->getAs<VectorType>()) {
-    // HVX vectors are returned in vector registers or register pairs.
-    if (T.hasFeature("hvx")) {
-      assert(T.hasFeature("hvx-length64b") || T.hasFeature("hvx-length128b"));
-      uint64_t VecSize = T.hasFeature("hvx-length64b") ? 64*8 : 128*8;
-      if (Size == VecSize || Size == 2*VecSize)
-        return ABIArgInfo::getDirectInReg();
-    }
-    // Large vector types should be returned via memory.
-    if (Size > 64)
-      return getNaturalAlignIndirect(RetTy);
-  }
-
-  if (!isAggregateTypeForABI(RetTy)) {
-    // Treat an enum type as its underlying type.
-    if (const EnumType *EnumTy = RetTy->getAs<EnumType>())
-      RetTy = EnumTy->getDecl()->getIntegerType();
-
-    if (Size > 64 && RetTy->isBitIntType())
-      return getNaturalAlignIndirect(RetTy, /*ByVal=*/false);
-
-    return isPromotableIntegerTypeForABI(RetTy) ? ABIArgInfo::getExtend(RetTy)
-                                                : ABIArgInfo::getDirect();
-  }
-
-  if (isEmptyRecord(getContext(), RetTy, true))
-    return ABIArgInfo::getIgnore();
-
-  // Aggregates <= 8 bytes are returned in registers, other aggregates
-  // are returned indirectly.
-  if (Size <= 64) {
-    // Return in the smallest viable integer type.
-    Size = llvm::bit_ceil(Size);
-    return ABIArgInfo::getDirect(llvm::Type::getIntNTy(getVMContext(), Size));
-  }
-  return getNaturalAlignIndirect(RetTy, /*ByVal=*/true);
-}
-
-Address HexagonABIInfo::EmitVAArgFromMemory(CodeGenFunction &CGF,
-                                            Address VAListAddr,
-                                            QualType Ty) const {
-  // Load the overflow area pointer.
-  Address __overflow_area_pointer_p =
-      CGF.Builder.CreateStructGEP(VAListAddr, 2, "__overflow_area_pointer_p");
-  llvm::Value *__overflow_area_pointer = CGF.Builder.CreateLoad(
-      __overflow_area_pointer_p, "__overflow_area_pointer");
-
-  uint64_t Align = CGF.getContext().getTypeAlign(Ty) / 8;
-  if (Align > 4) {
-    // Alignment should be a power of 2.
-    assert((Align & (Align - 1)) == 0 && "Alignment is not power of 2!");
-
-    // overflow_arg_area = (overflow_arg_area + align - 1) & -align;
-    llvm::Value *Offset = llvm::ConstantInt::get(CGF.Int64Ty, Align - 1);
-
-    // Add offset to the current pointer to access the argument.
-    __overflow_area_pointer =
-        CGF.Builder.CreateGEP(CGF.Int8Ty, __overflow_area_pointer, Offset);
-    llvm::Value *AsInt =
-        CGF.Builder.CreatePtrToInt(__overflow_area_pointer, CGF.Int32Ty);
-
-    // Create a mask which should be "AND"ed
-    // with (overflow_arg_area + align - 1)
-    llvm::Value *Mask = llvm::ConstantInt::get(CGF.Int32Ty, -(int)Align);
-    __overflow_area_pointer = CGF.Builder.CreateIntToPtr(
-        CGF.Builder.CreateAnd(AsInt, Mask), __overflow_area_pointer->getType(),
-        "__overflow_area_pointer.align");
-  }
-
-  // Get the type of the argument from memory and bitcast
-  // overflow area pointer to the argument type.
-  llvm::Type *PTy = CGF.ConvertTypeForMem(Ty);
-  Address AddrTyped = CGF.Builder.CreateElementBitCast(
-      Address(__overflow_area_pointer, CGF.Int8Ty,
-              CharUnits::fromQuantity(Align)),
-      PTy);
-
-  // Round up to the minimum stack alignment for varargs which is 4 bytes.
-  uint64_t Offset = llvm::alignTo(CGF.getContext().getTypeSize(Ty) / 8, 4);
-
-  __overflow_area_pointer = CGF.Builder.CreateGEP(
-      CGF.Int8Ty, __overflow_area_pointer,
-      llvm::ConstantInt::get(CGF.Int32Ty, Offset),
-      "__overflow_area_pointer.next");
-  CGF.Builder.CreateStore(__overflow_area_pointer, __overflow_area_pointer_p);
-
-  return AddrTyped;
-}
-
-Address HexagonABIInfo::EmitVAArgForHexagon(CodeGenFunction &CGF,
-                                            Address VAListAddr,
-                                            QualType Ty) const {
-  // FIXME: Need to handle alignment
-  llvm::Type *BP = CGF.Int8PtrTy;
-  CGBuilderTy &Builder = CGF.Builder;
-  Address VAListAddrAsBPP = Builder.CreateElementBitCast(VAListAddr, BP, "ap");
-  llvm::Value *Addr = Builder.CreateLoad(VAListAddrAsBPP, "ap.cur");
-  // Handle address alignment for type alignment > 32 bits
-  uint64_t TyAlign = CGF.getContext().getTypeAlign(Ty) / 8;
-  if (TyAlign > 4) {
-    assert((TyAlign & (TyAlign - 1)) == 0 && "Alignment is not power of 2!");
-    llvm::Value *AddrAsInt = Builder.CreatePtrToInt(Addr, CGF.Int32Ty);
-    AddrAsInt = Builder.CreateAdd(AddrAsInt, Builder.getInt32(TyAlign - 1));
-    AddrAsInt = Builder.CreateAnd(AddrAsInt, Builder.getInt32(~(TyAlign - 1)));
-    Addr = Builder.CreateIntToPtr(AddrAsInt, BP);
-  }
-  Address AddrTyped = Builder.CreateElementBitCast(
-      Address(Addr, CGF.Int8Ty, CharUnits::fromQuantity(TyAlign)),
-      CGF.ConvertType(Ty));
-
-  uint64_t Offset = llvm::alignTo(CGF.getContext().getTypeSize(Ty) / 8, 4);
-  llvm::Value *NextAddr = Builder.CreateGEP(
-      CGF.Int8Ty, Addr, llvm::ConstantInt::get(CGF.Int32Ty, Offset), "ap.next");
-  Builder.CreateStore(NextAddr, VAListAddrAsBPP);
-
-  return AddrTyped;
-}
-
-Address HexagonABIInfo::EmitVAArgForHexagonLinux(CodeGenFunction &CGF,
-                                                 Address VAListAddr,
-                                                 QualType Ty) const {
-  int ArgSize = CGF.getContext().getTypeSize(Ty) / 8;
-
-  if (ArgSize > 8)
-    return EmitVAArgFromMemory(CGF, VAListAddr, Ty);
-
-  // Here we have check if the argument is in register area or
-  // in overflow area.
-  // If the saved register area pointer + argsize rounded up to alignment >
-  // saved register area end pointer, argument is in overflow area.
-  unsigned RegsLeft = 6;
-  Ty = CGF.getContext().getCanonicalType(Ty);
-  (void)classifyArgumentType(Ty, &RegsLeft);
-
-  llvm::BasicBlock *MaybeRegBlock = CGF.createBasicBlock("vaarg.maybe_reg");
-  llvm::BasicBlock *InRegBlock = CGF.createBasicBlock("vaarg.in_reg");
-  llvm::BasicBlock *OnStackBlock = CGF.createBasicBlock("vaarg.on_stack");
-  llvm::BasicBlock *ContBlock = CGF.createBasicBlock("vaarg.end");
-
-  // Get rounded size of the argument.GCC does not allow vararg of
-  // size < 4 bytes. We follow the same logic here.
-  ArgSize = (CGF.getContext().getTypeSize(Ty) <= 32) ? 4 : 8;
-  int ArgAlign = (CGF.getContext().getTypeSize(Ty) <= 32) ? 4 : 8;
-
-  // Argument may be in saved register area
-  CGF.EmitBlock(MaybeRegBlock);
-
-  // Load the current saved register area pointer.
-  Address __current_saved_reg_area_pointer_p = CGF.Builder.CreateStructGEP(
-      VAListAddr, 0, "__current_saved_reg_area_pointer_p");
-  llvm::Value *__current_saved_reg_area_pointer = CGF.Builder.CreateLoad(
-      __current_saved_reg_area_pointer_p, "__current_saved_reg_area_pointer");
-
-  // Load the saved register area end pointer.
-  Address __saved_reg_area_end_pointer_p = CGF.Builder.CreateStructGEP(
-      VAListAddr, 1, "__saved_reg_area_end_pointer_p");
-  llvm::Value *__saved_reg_area_end_pointer = CGF.Builder.CreateLoad(
-      __saved_reg_area_end_pointer_p, "__saved_reg_area_end_pointer");
-
-  // If the size of argument is > 4 bytes, check if the stack
-  // location is aligned to 8 bytes
-  if (ArgAlign > 4) {
-
-    llvm::Value *__current_saved_reg_area_pointer_int =
-        CGF.Builder.CreatePtrToInt(__current_saved_reg_area_pointer,
-                                   CGF.Int32Ty);
-
-    __current_saved_reg_area_pointer_int = CGF.Builder.CreateAdd(
-        __current_saved_reg_area_pointer_int,
-        llvm::ConstantInt::get(CGF.Int32Ty, (ArgAlign - 1)),
-        "align_current_saved_reg_area_pointer");
-
-    __current_saved_reg_area_pointer_int =
-        CGF.Builder.CreateAnd(__current_saved_reg_area_pointer_int,
-                              llvm::ConstantInt::get(CGF.Int32Ty, -ArgAlign),
-                              "align_current_saved_reg_area_pointer");
-
-    __current_saved_reg_area_pointer =
-        CGF.Builder.CreateIntToPtr(__current_saved_reg_area_pointer_int,
-                                   __current_saved_reg_area_pointer->getType(),
-                                   "align_current_saved_reg_area_pointer");
-  }
-
-  llvm::Value *__new_saved_reg_area_pointer =
-      CGF.Builder.CreateGEP(CGF.Int8Ty, __current_saved_reg_area_pointer,
-                            llvm::ConstantInt::get(CGF.Int32Ty, ArgSize),
-                            "__new_saved_reg_area_pointer");
-
-  llvm::Value *UsingStack = nullptr;
-  UsingStack = CGF.Builder.CreateICmpSGT(__new_saved_reg_area_pointer,
-                                         __saved_reg_area_end_pointer);
-
-  CGF.Builder.CreateCondBr(UsingStack, OnStackBlock, InRegBlock);
-
-  // Argument in saved register area
-  // Implement the block where argument is in register saved area
-  CGF.EmitBlock(InRegBlock);
-
-  llvm::Type *PTy = CGF.ConvertType(Ty);
-  llvm::Value *__saved_reg_area_p = CGF.Builder.CreateBitCast(
-      __current_saved_reg_area_pointer, llvm::PointerType::getUnqual(PTy));
-
-  CGF.Builder.CreateStore(__new_saved_reg_area_pointer,
-                          __current_saved_reg_area_pointer_p);
-
-  CGF.EmitBranch(ContBlock);
-
-  // Argument in overflow area
-  // Implement the block where the argument is in overflow area.
-  CGF.EmitBlock(OnStackBlock);
-
-  // Load the overflow area pointer
-  Address __overflow_area_pointer_p =
-      CGF.Builder.CreateStructGEP(VAListAddr, 2, "__overflow_area_pointer_p");
-  llvm::Value *__overflow_area_pointer = CGF.Builder.CreateLoad(
-      __overflow_area_pointer_p, "__overflow_area_pointer");
-
-  // Align the overflow area pointer according to the alignment of the argument
-  if (ArgAlign > 4) {
-    llvm::Value *__overflow_area_pointer_int =
-        CGF.Builder.CreatePtrToInt(__overflow_area_pointer, CGF.Int32Ty);
-
-    __overflow_area_pointer_int =
-        CGF.Builder.CreateAdd(__overflow_area_pointer_int,
-                              llvm::ConstantInt::get(CGF.Int32Ty, ArgAlign - 1),
-                              "align_overflow_area_pointer");
-
-    __overflow_area_pointer_int =
-        CGF.Builder.CreateAnd(__overflow_area_pointer_int,
-                              llvm::ConstantInt::get(CGF.Int32Ty, -ArgAlign),
-                              "align_overflow_area_pointer");
-
-    __overflow_area_pointer = CGF.Builder.CreateIntToPtr(
-        __overflow_area_pointer_int, __overflow_area_pointer->getType(),
-        "align_overflow_area_pointer");
-  }
-
-  // Get the pointer for next argument in overflow area and store it
-  // to overflow area pointer.
-  llvm::Value *__new_overflow_area_pointer = CGF.Builder.CreateGEP(
-      CGF.Int8Ty, __overflow_area_pointer,
-      llvm::ConstantInt::get(CGF.Int32Ty, ArgSize),
-      "__overflow_area_pointer.next");
-
-  CGF.Builder.CreateStore(__new_overflow_area_pointer,
-                          __overflow_area_pointer_p);
-
-  CGF.Builder.CreateStore(__new_overflow_area_pointer,
-                          __current_saved_reg_area_pointer_p);
-
-  // Bitcast the overflow area pointer to the type of argument.
-  llvm::Type *OverflowPTy = CGF.ConvertTypeForMem(Ty);
-  llvm::Value *__overflow_area_p = CGF.Builder.CreateBitCast(
-      __overflow_area_pointer, llvm::PointerType::getUnqual(OverflowPTy));
-
-  CGF.EmitBranch(ContBlock);
-
-  // Get the correct pointer to load the variable argument
-  // Implement the ContBlock
-  CGF.EmitBlock(ContBlock);
-
-  llvm::Type *MemTy = CGF.ConvertTypeForMem(Ty);
-  llvm::Type *MemPTy = llvm::PointerType::getUnqual(MemTy);
-  llvm::PHINode *ArgAddr = CGF.Builder.CreatePHI(MemPTy, 2, "vaarg.addr");
-  ArgAddr->addIncoming(__saved_reg_area_p, InRegBlock);
-  ArgAddr->addIncoming(__overflow_area_p, OnStackBlock);
-
-  return Address(ArgAddr, MemTy, CharUnits::fromQuantity(ArgAlign));
-}
-
-Address HexagonABIInfo::EmitVAArg(CodeGenFunction &CGF, Address VAListAddr,
-                                  QualType Ty) const {
-
-  if (getTarget().getTriple().isMusl())
-    return EmitVAArgForHexagonLinux(CGF, VAListAddr, Ty);
-
-  return EmitVAArgForHexagon(CGF, VAListAddr, Ty);
-}
-
-//===----------------------------------------------------------------------===//
-// Lanai ABI Implementation
-//===----------------------------------------------------------------------===//
-
-namespace {
-class LanaiABIInfo : public DefaultABIInfo {
-  struct CCState {
-    unsigned FreeRegs;
-  };
-
-public:
-  LanaiABIInfo(CodeGen::CodeGenTypes &CGT) : DefaultABIInfo(CGT) {}
-
-  bool shouldUseInReg(QualType Ty, CCState &State) const;
-
-  void computeInfo(CGFunctionInfo &FI) const override {
-    CCState State;
-    // Lanai uses 4 registers to pass arguments unless the function has the
-    // regparm attribute set.
-    if (FI.getHasRegParm()) {
-      State.FreeRegs = FI.getRegParm();
-    } else {
-      State.FreeRegs = 4;
-    }
-
-    if (!getCXXABI().classifyReturnType(FI))
-      FI.getReturnInfo() = classifyReturnType(FI.getReturnType());
-    for (auto &I : FI.arguments())
-      I.info = classifyArgumentType(I.type, State);
-  }
-
-  ABIArgInfo getIndirectResult(QualType Ty, bool ByVal, CCState &State) const;
-  ABIArgInfo classifyArgumentType(QualType RetTy, CCState &State) const;
-};
-} // end anonymous namespace
-
-bool LanaiABIInfo::shouldUseInReg(QualType Ty, CCState &State) const {
-  unsigned Size = getContext().getTypeSize(Ty);
-  unsigned SizeInRegs = llvm::alignTo(Size, 32U) / 32U;
-
-  if (SizeInRegs == 0)
-    return false;
-
-  if (SizeInRegs > State.FreeRegs) {
-    State.FreeRegs = 0;
-    return false;
-  }
-
-  State.FreeRegs -= SizeInRegs;
-
-  return true;
-}
-
-ABIArgInfo LanaiABIInfo::getIndirectResult(QualType Ty, bool ByVal,
-                                           CCState &State) const {
-  if (!ByVal) {
-    if (State.FreeRegs) {
-      --State.FreeRegs; // Non-byval indirects just use one pointer.
-      return getNaturalAlignIndirectInReg(Ty);
-    }
-    return getNaturalAlignIndirect(Ty, false);
-  }
-
-  // Compute the byval alignment.
-  const unsigned MinABIStackAlignInBytes = 4;
-  unsigned TypeAlign = getContext().getTypeAlign(Ty) / 8;
-  return ABIArgInfo::getIndirect(CharUnits::fromQuantity(4), /*ByVal=*/true,
-                                 /*Realign=*/TypeAlign >
-                                     MinABIStackAlignInBytes);
-}
-
-ABIArgInfo LanaiABIInfo::classifyArgumentType(QualType Ty,
-                                              CCState &State) const {
-  // Check with the C++ ABI first.
-  const RecordType *RT = Ty->getAs<RecordType>();
-  if (RT) {
-    CGCXXABI::RecordArgABI RAA = getRecordArgABI(RT, getCXXABI());
-    if (RAA == CGCXXABI::RAA_Indirect) {
-      return getIndirectResult(Ty, /*ByVal=*/false, State);
-    } else if (RAA == CGCXXABI::RAA_DirectInMemory) {
-      return getNaturalAlignIndirect(Ty, /*ByVal=*/true);
-    }
-  }
-
-  if (isAggregateTypeForABI(Ty)) {
-    // Structures with flexible arrays are always indirect.
-    if (RT && RT->getDecl()->hasFlexibleArrayMember())
-      return getIndirectResult(Ty, /*ByVal=*/true, State);
-
-    // Ignore empty structs/unions.
-    if (isEmptyRecord(getContext(), Ty, true))
-      return ABIArgInfo::getIgnore();
-
-    llvm::LLVMContext &LLVMContext = getVMContext();
-    unsigned SizeInRegs = (getContext().getTypeSize(Ty) + 31) / 32;
-    if (SizeInRegs <= State.FreeRegs) {
-      llvm::IntegerType *Int32 = llvm::Type::getInt32Ty(LLVMContext);
-      SmallVector<llvm::Type *, 3> Elements(SizeInRegs, Int32);
-      llvm::Type *Result = llvm::StructType::get(LLVMContext, Elements);
-      State.FreeRegs -= SizeInRegs;
-      return ABIArgInfo::getDirectInReg(Result);
-    } else {
-      State.FreeRegs = 0;
-    }
-    return getIndirectResult(Ty, true, State);
-  }
-
-  // Treat an enum type as its underlying type.
-  if (const auto *EnumTy = Ty->getAs<EnumType>())
-    Ty = EnumTy->getDecl()->getIntegerType();
-
-  bool InReg = shouldUseInReg(Ty, State);
-
-  // Don't pass >64 bit integers in registers.
-  if (const auto *EIT = Ty->getAs<BitIntType>())
-    if (EIT->getNumBits() > 64)
-      return getIndirectResult(Ty, /*ByVal=*/true, State);
-
-  if (isPromotableIntegerTypeForABI(Ty)) {
-    if (InReg)
-      return ABIArgInfo::getDirectInReg();
-    return ABIArgInfo::getExtend(Ty);
-  }
-  if (InReg)
-    return ABIArgInfo::getDirectInReg();
-  return ABIArgInfo::getDirect();
-}
-
-namespace {
-class LanaiTargetCodeGenInfo : public TargetCodeGenInfo {
-public:
-  LanaiTargetCodeGenInfo(CodeGen::CodeGenTypes &CGT)
-      : TargetCodeGenInfo(std::make_unique<LanaiABIInfo>(CGT)) {}
-};
-}
-
-//===----------------------------------------------------------------------===//
-// AMDGPU ABI Implementation
-//===----------------------------------------------------------------------===//
-
-namespace {
-
-class AMDGPUABIInfo final : public DefaultABIInfo {
-private:
-  static const unsigned MaxNumRegsForArgsRet = 16;
-
-  unsigned numRegsForType(QualType Ty) const;
-
-  bool isHomogeneousAggregateBaseType(QualType Ty) const override;
-  bool isHomogeneousAggregateSmallEnough(const Type *Base,
-                                         uint64_t Members) const override;
-
-  // Coerce HIP scalar pointer arguments from generic pointers to global ones.
-  llvm::Type *coerceKernelArgumentType(llvm::Type *Ty, unsigned FromAS,
-                                       unsigned ToAS) const {
-    // Single value types.
-    auto *PtrTy = llvm::dyn_cast<llvm::PointerType>(Ty);
-    if (PtrTy && PtrTy->getAddressSpace() == FromAS)
-      return llvm::PointerType::getWithSamePointeeType(PtrTy, ToAS);
-    return Ty;
-  }
-
-public:
-  explicit AMDGPUABIInfo(CodeGen::CodeGenTypes &CGT) :
-    DefaultABIInfo(CGT) {}
-
-  ABIArgInfo classifyReturnType(QualType RetTy) const;
-  ABIArgInfo classifyKernelArgumentType(QualType Ty) const;
-  ABIArgInfo classifyArgumentType(QualType Ty, unsigned &NumRegsLeft) const;
-
-  void computeInfo(CGFunctionInfo &FI) const override;
-  Address EmitVAArg(CodeGenFunction &CGF, Address VAListAddr,
-                    QualType Ty) const override;
-};
-
-bool AMDGPUABIInfo::isHomogeneousAggregateBaseType(QualType Ty) const {
-  return true;
-}
-
-bool AMDGPUABIInfo::isHomogeneousAggregateSmallEnough(
-  const Type *Base, uint64_t Members) const {
-  uint32_t NumRegs = (getContext().getTypeSize(Base) + 31) / 32;
-
-  // Homogeneous Aggregates may occupy at most 16 registers.
-  return Members * NumRegs <= MaxNumRegsForArgsRet;
-}
-
-/// Estimate number of registers the type will use when passed in registers.
-unsigned AMDGPUABIInfo::numRegsForType(QualType Ty) const {
-  unsigned NumRegs = 0;
-
-  if (const VectorType *VT = Ty->getAs<VectorType>()) {
-    // Compute from the number of elements. The reported size is based on the
-    // in-memory size, which includes the padding 4th element for 3-vectors.
-    QualType EltTy = VT->getElementType();
-    unsigned EltSize = getContext().getTypeSize(EltTy);
-
-    // 16-bit element vectors should be passed as packed.
-    if (EltSize == 16)
-      return (VT->getNumElements() + 1) / 2;
-
-    unsigned EltNumRegs = (EltSize + 31) / 32;
-    return EltNumRegs * VT->getNumElements();
-  }
-
-  if (const RecordType *RT = Ty->getAs<RecordType>()) {
-    const RecordDecl *RD = RT->getDecl();
-    assert(!RD->hasFlexibleArrayMember());
-
-    for (const FieldDecl *Field : RD->fields()) {
-      QualType FieldTy = Field->getType();
-      NumRegs += numRegsForType(FieldTy);
-    }
-
-    return NumRegs;
-  }
-
-  return (getContext().getTypeSize(Ty) + 31) / 32;
-}
-
-void AMDGPUABIInfo::computeInfo(CGFunctionInfo &FI) const {
-  llvm::CallingConv::ID CC = FI.getCallingConvention();
-
-  if (!getCXXABI().classifyReturnType(FI))
-    FI.getReturnInfo() = classifyReturnType(FI.getReturnType());
-
-  unsigned NumRegsLeft = MaxNumRegsForArgsRet;
-  for (auto &Arg : FI.arguments()) {
-    if (CC == llvm::CallingConv::AMDGPU_KERNEL) {
-      Arg.info = classifyKernelArgumentType(Arg.type);
-    } else {
-      Arg.info = classifyArgumentType(Arg.type, NumRegsLeft);
-    }
-  }
-}
-
-Address AMDGPUABIInfo::EmitVAArg(CodeGenFunction &CGF, Address VAListAddr,
-                                 QualType Ty) const {
-  llvm_unreachable("AMDGPU does not support varargs");
-}
-
-ABIArgInfo AMDGPUABIInfo::classifyReturnType(QualType RetTy) const {
-  if (isAggregateTypeForABI(RetTy)) {
-    // Records with non-trivial destructors/copy-constructors should not be
-    // returned by value.
-    if (!getRecordArgABI(RetTy, getCXXABI())) {
-      // Ignore empty structs/unions.
-      if (isEmptyRecord(getContext(), RetTy, true))
-        return ABIArgInfo::getIgnore();
-
-      // Lower single-element structs to just return a regular value.
-      if (const Type *SeltTy = isSingleElementStruct(RetTy, getContext()))
-        return ABIArgInfo::getDirect(CGT.ConvertType(QualType(SeltTy, 0)));
-
-      if (const RecordType *RT = RetTy->getAs<RecordType>()) {
-        const RecordDecl *RD = RT->getDecl();
-        if (RD->hasFlexibleArrayMember())
-          return DefaultABIInfo::classifyReturnType(RetTy);
-      }
-
-      // Pack aggregates <= 4 bytes into single VGPR or pair.
-      uint64_t Size = getContext().getTypeSize(RetTy);
-      if (Size <= 16)
-        return ABIArgInfo::getDirect(llvm::Type::getInt16Ty(getVMContext()));
-
-      if (Size <= 32)
-        return ABIArgInfo::getDirect(llvm::Type::getInt32Ty(getVMContext()));
-
-      if (Size <= 64) {
-        llvm::Type *I32Ty = llvm::Type::getInt32Ty(getVMContext());
-        return ABIArgInfo::getDirect(llvm::ArrayType::get(I32Ty, 2));
-      }
-
-      if (numRegsForType(RetTy) <= MaxNumRegsForArgsRet)
-        return ABIArgInfo::getDirect();
-    }
-  }
-
-  // Otherwise just do the default thing.
-  return DefaultABIInfo::classifyReturnType(RetTy);
-}
-
-/// For kernels all parameters are really passed in a special buffer. It doesn't
-/// make sense to pass anything byval, so everything must be direct.
-ABIArgInfo AMDGPUABIInfo::classifyKernelArgumentType(QualType Ty) const {
-  Ty = useFirstFieldIfTransparentUnion(Ty);
-
-  // TODO: Can we omit empty structs?
-
-  if (const Type *SeltTy = isSingleElementStruct(Ty, getContext()))
-    Ty = QualType(SeltTy, 0);
-
-  llvm::Type *OrigLTy = CGT.ConvertType(Ty);
-  llvm::Type *LTy = OrigLTy;
-  if (getContext().getLangOpts().HIP) {
-    LTy = coerceKernelArgumentType(
-        OrigLTy, /*FromAS=*/getContext().getTargetAddressSpace(LangAS::Default),
-        /*ToAS=*/getContext().getTargetAddressSpace(LangAS::cuda_device));
-  }
-
-  // FIXME: Should also use this for OpenCL, but it requires addressing the
-  // problem of kernels being called.
-  //
-  // FIXME: This doesn't apply the optimization of coercing pointers in structs
-  // to global address space when using byref. This would require implementing a
-  // new kind of coercion of the in-memory type when for indirect arguments.
-  if (!getContext().getLangOpts().OpenCL && LTy == OrigLTy &&
-      isAggregateTypeForABI(Ty)) {
-    return ABIArgInfo::getIndirectAliased(
-        getContext().getTypeAlignInChars(Ty),
-        getContext().getTargetAddressSpace(LangAS::opencl_constant),
-        false /*Realign*/, nullptr /*Padding*/);
-  }
-
-  // If we set CanBeFlattened to true, CodeGen will expand the struct to its
-  // individual elements, which confuses the Clover OpenCL backend; therefore we
-  // have to set it to false here. Other args of getDirect() are just defaults.
-  return ABIArgInfo::getDirect(LTy, 0, nullptr, false);
-}
-
-ABIArgInfo AMDGPUABIInfo::classifyArgumentType(QualType Ty,
-                                               unsigned &NumRegsLeft) const {
-  assert(NumRegsLeft <= MaxNumRegsForArgsRet && "register estimate underflow");
-
-  Ty = useFirstFieldIfTransparentUnion(Ty);
-
-  if (isAggregateTypeForABI(Ty)) {
-    // Records with non-trivial destructors/copy-constructors should not be
-    // passed by value.
-    if (auto RAA = getRecordArgABI(Ty, getCXXABI()))
-      return getNaturalAlignIndirect(Ty, RAA == CGCXXABI::RAA_DirectInMemory);
-
-    // Ignore empty structs/unions.
-    if (isEmptyRecord(getContext(), Ty, true))
-      return ABIArgInfo::getIgnore();
-
-    // Lower single-element structs to just pass a regular value. TODO: We
-    // could do reasonable-size multiple-element structs too, using getExpand(),
-    // though watch out for things like bitfields.
-    if (const Type *SeltTy = isSingleElementStruct(Ty, getContext()))
-      return ABIArgInfo::getDirect(CGT.ConvertType(QualType(SeltTy, 0)));
-
-    if (const RecordType *RT = Ty->getAs<RecordType>()) {
-      const RecordDecl *RD = RT->getDecl();
-      if (RD->hasFlexibleArrayMember())
-        return DefaultABIInfo::classifyArgumentType(Ty);
-    }
-
-    // Pack aggregates <= 8 bytes into single VGPR or pair.
-    uint64_t Size = getContext().getTypeSize(Ty);
-    if (Size <= 64) {
-      unsigned NumRegs = (Size + 31) / 32;
-      NumRegsLeft -= std::min(NumRegsLeft, NumRegs);
-
-      if (Size <= 16)
-        return ABIArgInfo::getDirect(llvm::Type::getInt16Ty(getVMContext()));
-
-      if (Size <= 32)
-        return ABIArgInfo::getDirect(llvm::Type::getInt32Ty(getVMContext()));
-
-      // XXX: Should this be i64 instead, and should the limit increase?
-      llvm::Type *I32Ty = llvm::Type::getInt32Ty(getVMContext());
-      return ABIArgInfo::getDirect(llvm::ArrayType::get(I32Ty, 2));
-    }
-
-    if (NumRegsLeft > 0) {
-      unsigned NumRegs = numRegsForType(Ty);
-      if (NumRegsLeft >= NumRegs) {
-        NumRegsLeft -= NumRegs;
-        return ABIArgInfo::getDirect();
-      }
-    }
-  }
-
-  // Otherwise just do the default thing.
-  ABIArgInfo ArgInfo = DefaultABIInfo::classifyArgumentType(Ty);
-  if (!ArgInfo.isIndirect()) {
-    unsigned NumRegs = numRegsForType(Ty);
-    NumRegsLeft -= std::min(NumRegs, NumRegsLeft);
-  }
-
-  return ArgInfo;
-}
-
-class AMDGPUTargetCodeGenInfo : public TargetCodeGenInfo {
-public:
-  AMDGPUTargetCodeGenInfo(CodeGenTypes &CGT)
-      : TargetCodeGenInfo(std::make_unique<AMDGPUABIInfo>(CGT)) {}
-
-  void setFunctionDeclAttributes(const FunctionDecl *FD, llvm::Function *F,
-                                 CodeGenModule &CGM) const;
-
-  void setTargetAttributes(const Decl *D, llvm::GlobalValue *GV,
-                           CodeGen::CodeGenModule &M) const override;
-  unsigned getOpenCLKernelCallingConv() const override;
-
-  llvm::Constant *getNullPointer(const CodeGen::CodeGenModule &CGM,
-      llvm::PointerType *T, QualType QT) const override;
-
-  LangAS getASTAllocaAddressSpace() const override {
-    return getLangASFromTargetAS(
-        getABIInfo().getDataLayout().getAllocaAddrSpace());
-  }
-  LangAS getGlobalVarAddressSpace(CodeGenModule &CGM,
-                                  const VarDecl *D) const override;
-  llvm::SyncScope::ID getLLVMSyncScopeID(const LangOptions &LangOpts,
-                                         SyncScope Scope,
-                                         llvm::AtomicOrdering Ordering,
-                                         llvm::LLVMContext &Ctx) const override;
-  llvm::Value *createEnqueuedBlockKernel(CodeGenFunction &CGF,
-                                         llvm::Function *BlockInvokeFunc,
-                                         llvm::Type *BlockTy) const override;
-  bool shouldEmitStaticExternCAliases() const override;
-  bool shouldEmitDWARFBitFieldSeparators() const override;
-  void setCUDAKernelCallingConvention(const FunctionType *&FT) const override;
-};
-}
-
-static bool requiresAMDGPUProtectedVisibility(const Decl *D,
-                                              llvm::GlobalValue *GV) {
-  if (GV->getVisibility() != llvm::GlobalValue::HiddenVisibility)
-    return false;
-
-  return D->hasAttr<OpenCLKernelAttr>() ||
-         (isa<FunctionDecl>(D) && D->hasAttr<CUDAGlobalAttr>()) ||
-         (isa<VarDecl>(D) &&
-          (D->hasAttr<CUDADeviceAttr>() || D->hasAttr<CUDAConstantAttr>() ||
-           cast<VarDecl>(D)->getType()->isCUDADeviceBuiltinSurfaceType() ||
-           cast<VarDecl>(D)->getType()->isCUDADeviceBuiltinTextureType()));
-}
-
-void AMDGPUTargetCodeGenInfo::setFunctionDeclAttributes(
-    const FunctionDecl *FD, llvm::Function *F, CodeGenModule &M) const {
-  const auto *ReqdWGS =
-      M.getLangOpts().OpenCL ? FD->getAttr<ReqdWorkGroupSizeAttr>() : nullptr;
-  const bool IsOpenCLKernel =
-      M.getLangOpts().OpenCL && FD->hasAttr<OpenCLKernelAttr>();
-  const bool IsHIPKernel = M.getLangOpts().HIP && FD->hasAttr<CUDAGlobalAttr>();
-
-  const auto *FlatWGS = FD->getAttr<AMDGPUFlatWorkGroupSizeAttr>();
-  if (ReqdWGS || FlatWGS) {
-    unsigned Min = 0;
-    unsigned Max = 0;
-    if (FlatWGS) {
-      Min = FlatWGS->getMin()
-                ->EvaluateKnownConstInt(M.getContext())
-                .getExtValue();
-      Max = FlatWGS->getMax()
-                ->EvaluateKnownConstInt(M.getContext())
-                .getExtValue();
-    }
-    if (ReqdWGS && Min == 0 && Max == 0)
-      Min = Max = ReqdWGS->getXDim() * ReqdWGS->getYDim() * ReqdWGS->getZDim();
-
-    if (Min != 0) {
-      assert(Min <= Max && "Min must be less than or equal Max");
-
-      std::string AttrVal = llvm::utostr(Min) + "," + llvm::utostr(Max);
-      F->addFnAttr("amdgpu-flat-work-group-size", AttrVal);
-    } else
-      assert(Max == 0 && "Max must be zero");
-  } else if (IsOpenCLKernel || IsHIPKernel) {
-    // By default, restrict the maximum size to a value specified by
-    // --gpu-max-threads-per-block=n or its default value for HIP.
-    const unsigned OpenCLDefaultMaxWorkGroupSize = 256;
-    const unsigned DefaultMaxWorkGroupSize =
-        IsOpenCLKernel ? OpenCLDefaultMaxWorkGroupSize
-                       : M.getLangOpts().GPUMaxThreadsPerBlock;
-    std::string AttrVal =
-        std::string("1,") + llvm::utostr(DefaultMaxWorkGroupSize);
-    F->addFnAttr("amdgpu-flat-work-group-size", AttrVal);
-  }
-
-  if (const auto *Attr = FD->getAttr<AMDGPUWavesPerEUAttr>()) {
-    unsigned Min =
-        Attr->getMin()->EvaluateKnownConstInt(M.getContext()).getExtValue();
-    unsigned Max = Attr->getMax() ? Attr->getMax()
-                                        ->EvaluateKnownConstInt(M.getContext())
-                                        .getExtValue()
-                                  : 0;
-
-    if (Min != 0) {
-      assert((Max == 0 || Min <= Max) && "Min must be less than or equal Max");
-
-      std::string AttrVal = llvm::utostr(Min);
-      if (Max != 0)
-        AttrVal = AttrVal + "," + llvm::utostr(Max);
-      F->addFnAttr("amdgpu-waves-per-eu", AttrVal);
-    } else
-      assert(Max == 0 && "Max must be zero");
-  }
-
-  if (const auto *Attr = FD->getAttr<AMDGPUNumSGPRAttr>()) {
-    unsigned NumSGPR = Attr->getNumSGPR();
-
-    if (NumSGPR != 0)
-      F->addFnAttr("amdgpu-num-sgpr", llvm::utostr(NumSGPR));
-  }
-
-  if (const auto *Attr = FD->getAttr<AMDGPUNumVGPRAttr>()) {
-    uint32_t NumVGPR = Attr->getNumVGPR();
-
-    if (NumVGPR != 0)
-      F->addFnAttr("amdgpu-num-vgpr", llvm::utostr(NumVGPR));
-  }
-}
-
-void AMDGPUTargetCodeGenInfo::setTargetAttributes(
-    const Decl *D, llvm::GlobalValue *GV, CodeGen::CodeGenModule &M) const {
-  if (requiresAMDGPUProtectedVisibility(D, GV)) {
-    GV->setVisibility(llvm::GlobalValue::ProtectedVisibility);
-    GV->setDSOLocal(true);
-  }
-
-  if (GV->isDeclaration())
-    return;
-
-  llvm::Function *F = dyn_cast<llvm::Function>(GV);
-  if (!F)
-    return;
-
-  const FunctionDecl *FD = dyn_cast_or_null<FunctionDecl>(D);
-  if (FD)
-    setFunctionDeclAttributes(FD, F, M);
-
-  const bool IsHIPKernel =
-      M.getLangOpts().HIP && FD && FD->hasAttr<CUDAGlobalAttr>();
-
-  // TODO: This should be moved to language specific attributes instead.
-  if (IsHIPKernel)
-    F->addFnAttr("uniform-work-group-size", "true");
-
-  if (M.getContext().getTargetInfo().allowAMDGPUUnsafeFPAtomics())
-    F->addFnAttr("amdgpu-unsafe-fp-atomics", "true");
-
-  if (!getABIInfo().getCodeGenOpts().EmitIEEENaNCompliantInsts)
-    F->addFnAttr("amdgpu-ieee", "false");
-}
-
-unsigned AMDGPUTargetCodeGenInfo::getOpenCLKernelCallingConv() const {
-  return llvm::CallingConv::AMDGPU_KERNEL;
-}
-
-// Currently LLVM assumes null pointers always have value 0,
-// which results in incorrectly transformed IR. Therefore, instead of
-// emitting null pointers in private and local address spaces, a null
-// pointer in generic address space is emitted which is casted to a
-// pointer in local or private address space.
-llvm::Constant *AMDGPUTargetCodeGenInfo::getNullPointer(
-    const CodeGen::CodeGenModule &CGM, llvm::PointerType *PT,
-    QualType QT) const {
-  if (CGM.getContext().getTargetNullPointerValue(QT) == 0)
-    return llvm::ConstantPointerNull::get(PT);
-
-  auto &Ctx = CGM.getContext();
-  auto NPT = llvm::PointerType::getWithSamePointeeType(
-      PT, Ctx.getTargetAddressSpace(LangAS::opencl_generic));
-  return llvm::ConstantExpr::getAddrSpaceCast(
-      llvm::ConstantPointerNull::get(NPT), PT);
-}
-
-LangAS
-AMDGPUTargetCodeGenInfo::getGlobalVarAddressSpace(CodeGenModule &CGM,
-                                                  const VarDecl *D) const {
-  assert(!CGM.getLangOpts().OpenCL &&
-         !(CGM.getLangOpts().CUDA && CGM.getLangOpts().CUDAIsDevice) &&
-         "Address space agnostic languages only");
-  LangAS DefaultGlobalAS = getLangASFromTargetAS(
-      CGM.getContext().getTargetAddressSpace(LangAS::opencl_global));
-  if (!D)
-    return DefaultGlobalAS;
-
-  LangAS AddrSpace = D->getType().getAddressSpace();
-  assert(AddrSpace == LangAS::Default || isTargetAddressSpace(AddrSpace));
-  if (AddrSpace != LangAS::Default)
-    return AddrSpace;
-
-  // Only promote to address space 4 if VarDecl has constant initialization.
-  if (CGM.isTypeConstant(D->getType(), false, false) &&
-      D->hasConstantInitialization()) {
-    if (auto ConstAS = CGM.getTarget().getConstantAddressSpace())
-      return *ConstAS;
-  }
-  return DefaultGlobalAS;
-}
-
-llvm::SyncScope::ID
-AMDGPUTargetCodeGenInfo::getLLVMSyncScopeID(const LangOptions &LangOpts,
-                                            SyncScope Scope,
-                                            llvm::AtomicOrdering Ordering,
-                                            llvm::LLVMContext &Ctx) const {
-  std::string Name;
-  switch (Scope) {
-  case SyncScope::HIPSingleThread:
-    Name = "singlethread";
-    break;
-  case SyncScope::HIPWavefront:
-  case SyncScope::OpenCLSubGroup:
-    Name = "wavefront";
-    break;
-  case SyncScope::HIPWorkgroup:
-  case SyncScope::OpenCLWorkGroup:
-    Name = "workgroup";
-    break;
-  case SyncScope::HIPAgent:
-  case SyncScope::OpenCLDevice:
-    Name = "agent";
-    break;
-  case SyncScope::HIPSystem:
-  case SyncScope::OpenCLAllSVMDevices:
-    Name = "";
-    break;
-  }
-
-  if (Ordering != llvm::AtomicOrdering::SequentiallyConsistent) {
-    if (!Name.empty())
-      Name = Twine(Twine(Name) + Twine("-")).str();
-
-    Name = Twine(Twine(Name) + Twine("one-as")).str();
-  }
-
-  return Ctx.getOrInsertSyncScopeID(Name);
-}
-
-bool AMDGPUTargetCodeGenInfo::shouldEmitStaticExternCAliases() const {
-  return false;
-}
-
-bool AMDGPUTargetCodeGenInfo::shouldEmitDWARFBitFieldSeparators() const {
-  return true;
-}
-
-void AMDGPUTargetCodeGenInfo::setCUDAKernelCallingConvention(
-    const FunctionType *&FT) const {
-  FT = getABIInfo().getContext().adjustFunctionType(
-      FT, FT->getExtInfo().withCallingConv(CC_OpenCLKernel));
-}
-
-//===----------------------------------------------------------------------===//
-// SPARC v8 ABI Implementation.
-// Based on the SPARC Compliance Definition version 2.4.1.
-//
-// Ensures that complex values are passed in registers.
-//
-namespace {
-class SparcV8ABIInfo : public DefaultABIInfo {
-public:
-  SparcV8ABIInfo(CodeGenTypes &CGT) : DefaultABIInfo(CGT) {}
-
-private:
-  ABIArgInfo classifyReturnType(QualType RetTy) const;
-  void computeInfo(CGFunctionInfo &FI) const override;
-};
-} // end anonymous namespace
-
-
-ABIArgInfo
-SparcV8ABIInfo::classifyReturnType(QualType Ty) const {
-  if (Ty->isAnyComplexType()) {
-    return ABIArgInfo::getDirect();
-  }
-  else {
-    return DefaultABIInfo::classifyReturnType(Ty);
-  }
-}
-
-void SparcV8ABIInfo::computeInfo(CGFunctionInfo &FI) const {
-
-  FI.getReturnInfo() = classifyReturnType(FI.getReturnType());
-  for (auto &Arg : FI.arguments())
-    Arg.info = classifyArgumentType(Arg.type);
-}
-
-namespace {
-class SparcV8TargetCodeGenInfo : public TargetCodeGenInfo {
-public:
-  SparcV8TargetCodeGenInfo(CodeGenTypes &CGT)
-      : TargetCodeGenInfo(std::make_unique<SparcV8ABIInfo>(CGT)) {}
-
-  llvm::Value *decodeReturnAddress(CodeGen::CodeGenFunction &CGF,
-                                   llvm::Value *Address) const override {
-    int Offset;
-    if (isAggregateTypeForABI(CGF.CurFnInfo->getReturnType()))
-      Offset = 12;
-    else
-      Offset = 8;
-    return CGF.Builder.CreateGEP(CGF.Int8Ty, Address,
-                                 llvm::ConstantInt::get(CGF.Int32Ty, Offset));
-  }
-
-  llvm::Value *encodeReturnAddress(CodeGen::CodeGenFunction &CGF,
-                                   llvm::Value *Address) const override {
-    int Offset;
-    if (isAggregateTypeForABI(CGF.CurFnInfo->getReturnType()))
-      Offset = -12;
-    else
-      Offset = -8;
-    return CGF.Builder.CreateGEP(CGF.Int8Ty, Address,
-                                 llvm::ConstantInt::get(CGF.Int32Ty, Offset));
-  }
-};
-} // end anonymous namespace
-
-//===----------------------------------------------------------------------===//
-// SPARC v9 ABI Implementation.
-// Based on the SPARC Compliance Definition version 2.4.1.
-//
-// Function arguments a mapped to a nominal "parameter array" and promoted to
-// registers depending on their type. Each argument occupies 8 or 16 bytes in
-// the array, structs larger than 16 bytes are passed indirectly.
-//
-// One case requires special care:
-//
-//   struct mixed {
-//     int i;
-//     float f;
-//   };
-//
-// When a struct mixed is passed by value, it only occupies 8 bytes in the
-// parameter array, but the int is passed in an integer register, and the float
-// is passed in a floating point register. This is represented as two arguments
-// with the LLVM IR inreg attribute:
-//
-//   declare void f(i32 inreg %i, float inreg %f)
-//
-// The code generator will only allocate 4 bytes from the parameter array for
-// the inreg arguments. All other arguments are allocated a multiple of 8
-// bytes.
-//
-namespace {
-class SparcV9ABIInfo : public ABIInfo {
-public:
-  SparcV9ABIInfo(CodeGenTypes &CGT) : ABIInfo(CGT) {}
-
-private:
-  ABIArgInfo classifyType(QualType RetTy, unsigned SizeLimit) const;
-  void computeInfo(CGFunctionInfo &FI) const override;
-  Address EmitVAArg(CodeGenFunction &CGF, Address VAListAddr,
-                    QualType Ty) const override;
-
-  // Coercion type builder for structs passed in registers. The coercion type
-  // serves two purposes:
-  //
-  // 1. Pad structs to a multiple of 64 bits, so they are passed 'left-aligned'
-  //    in registers.
-  // 2. Expose aligned floating point elements as first-level elements, so the
-  //    code generator knows to pass them in floating point registers.
-  //
-  // We also compute the InReg flag which indicates that the struct contains
-  // aligned 32-bit floats.
-  //
-  struct CoerceBuilder {
-    llvm::LLVMContext &Context;
-    const llvm::DataLayout &DL;
-    SmallVector<llvm::Type*, 8> Elems;
-    uint64_t Size;
-    bool InReg;
-
-    CoerceBuilder(llvm::LLVMContext &c, const llvm::DataLayout &dl)
-      : Context(c), DL(dl), Size(0), InReg(false) {}
-
-    // Pad Elems with integers until Size is ToSize.
-    void pad(uint64_t ToSize) {
-      assert(ToSize >= Size && "Cannot remove elements");
-      if (ToSize == Size)
-        return;
-
-      // Finish the current 64-bit word.
-      uint64_t Aligned = llvm::alignTo(Size, 64);
-      if (Aligned > Size && Aligned <= ToSize) {
-        Elems.push_back(llvm::IntegerType::get(Context, Aligned - Size));
-        Size = Aligned;
-      }
-
-      // Add whole 64-bit words.
-      while (Size + 64 <= ToSize) {
-        Elems.push_back(llvm::Type::getInt64Ty(Context));
-        Size += 64;
-      }
-
-      // Final in-word padding.
-      if (Size < ToSize) {
-        Elems.push_back(llvm::IntegerType::get(Context, ToSize - Size));
-        Size = ToSize;
-      }
-    }
-
-    // Add a floating point element at Offset.
-    void addFloat(uint64_t Offset, llvm::Type *Ty, unsigned Bits) {
-      // Unaligned floats are treated as integers.
-      if (Offset % Bits)
-        return;
-      // The InReg flag is only required if there are any floats < 64 bits.
-      if (Bits < 64)
-        InReg = true;
-      pad(Offset);
-      Elems.push_back(Ty);
-      Size = Offset + Bits;
-    }
-
-    // Add a struct type to the coercion type, starting at Offset (in bits).
-    void addStruct(uint64_t Offset, llvm::StructType *StrTy) {
-      const llvm::StructLayout *Layout = DL.getStructLayout(StrTy);
-      for (unsigned i = 0, e = StrTy->getNumElements(); i != e; ++i) {
-        llvm::Type *ElemTy = StrTy->getElementType(i);
-        uint64_t ElemOffset = Offset + Layout->getElementOffsetInBits(i);
-        switch (ElemTy->getTypeID()) {
-        case llvm::Type::StructTyID:
-          addStruct(ElemOffset, cast<llvm::StructType>(ElemTy));
-          break;
-        case llvm::Type::FloatTyID:
-          addFloat(ElemOffset, ElemTy, 32);
-          break;
-        case llvm::Type::DoubleTyID:
-          addFloat(ElemOffset, ElemTy, 64);
-          break;
-        case llvm::Type::FP128TyID:
-          addFloat(ElemOffset, ElemTy, 128);
-          break;
-        case llvm::Type::PointerTyID:
-          if (ElemOffset % 64 == 0) {
-            pad(ElemOffset);
-            Elems.push_back(ElemTy);
-            Size += 64;
-          }
-          break;
-        default:
-          break;
-        }
-      }
-    }
-
-    // Check if Ty is a usable substitute for the coercion type.
-    bool isUsableType(llvm::StructType *Ty) const {
-      return llvm::ArrayRef(Elems) == Ty->elements();
-    }
-
-    // Get the coercion type as a literal struct type.
-    llvm::Type *getType() const {
-      if (Elems.size() == 1)
-        return Elems.front();
-      else
-        return llvm::StructType::get(Context, Elems);
-    }
-  };
-};
-} // end anonymous namespace
-
-ABIArgInfo
-SparcV9ABIInfo::classifyType(QualType Ty, unsigned SizeLimit) const {
-  if (Ty->isVoidType())
-    return ABIArgInfo::getIgnore();
-
-  uint64_t Size = getContext().getTypeSize(Ty);
-
-  // Anything too big to fit in registers is passed with an explicit indirect
-  // pointer / sret pointer.
-  if (Size > SizeLimit)
-    return getNaturalAlignIndirect(Ty, /*ByVal=*/false);
-
-  // Treat an enum type as its underlying type.
-  if (const EnumType *EnumTy = Ty->getAs<EnumType>())
-    Ty = EnumTy->getDecl()->getIntegerType();
-
-  // Integer types smaller than a register are extended.
-  if (Size < 64 && Ty->isIntegerType())
-    return ABIArgInfo::getExtend(Ty);
-
-  if (const auto *EIT = Ty->getAs<BitIntType>())
-    if (EIT->getNumBits() < 64)
-      return ABIArgInfo::getExtend(Ty);
-
-  // Other non-aggregates go in registers.
-  if (!isAggregateTypeForABI(Ty))
-    return ABIArgInfo::getDirect();
-
-  // If a C++ object has either a non-trivial copy constructor or a non-trivial
-  // destructor, it is passed with an explicit indirect pointer / sret pointer.
-  if (CGCXXABI::RecordArgABI RAA = getRecordArgABI(Ty, getCXXABI()))
-    return getNaturalAlignIndirect(Ty, RAA == CGCXXABI::RAA_DirectInMemory);
-
-  // This is a small aggregate type that should be passed in registers.
-  // Build a coercion type from the LLVM struct type.
-  llvm::StructType *StrTy = dyn_cast<llvm::StructType>(CGT.ConvertType(Ty));
-  if (!StrTy)
-    return ABIArgInfo::getDirect();
-
-  CoerceBuilder CB(getVMContext(), getDataLayout());
-  CB.addStruct(0, StrTy);
-  CB.pad(llvm::alignTo(CB.DL.getTypeSizeInBits(StrTy), 64));
-
-  // Try to use the original type for coercion.
-  llvm::Type *CoerceTy = CB.isUsableType(StrTy) ? StrTy : CB.getType();
-
-  if (CB.InReg)
-    return ABIArgInfo::getDirectInReg(CoerceTy);
-  else
-    return ABIArgInfo::getDirect(CoerceTy);
-}
-
-Address SparcV9ABIInfo::EmitVAArg(CodeGenFunction &CGF, Address VAListAddr,
-                                  QualType Ty) const {
-  ABIArgInfo AI = classifyType(Ty, 16 * 8);
-  llvm::Type *ArgTy = CGT.ConvertType(Ty);
-  if (AI.canHaveCoerceToType() && !AI.getCoerceToType())
-    AI.setCoerceToType(ArgTy);
-
-  CharUnits SlotSize = CharUnits::fromQuantity(8);
-
-  CGBuilderTy &Builder = CGF.Builder;
-  Address Addr = Address(Builder.CreateLoad(VAListAddr, "ap.cur"),
-                         getVAListElementType(CGF), SlotSize);
-  llvm::Type *ArgPtrTy = llvm::PointerType::getUnqual(ArgTy);
-
-  auto TypeInfo = getContext().getTypeInfoInChars(Ty);
-
-  Address ArgAddr = Address::invalid();
-  CharUnits Stride;
-  switch (AI.getKind()) {
-  case ABIArgInfo::Expand:
-  case ABIArgInfo::CoerceAndExpand:
-  case ABIArgInfo::InAlloca:
-    llvm_unreachable("Unsupported ABI kind for va_arg");
-
-  case ABIArgInfo::Extend: {
-    Stride = SlotSize;
-    CharUnits Offset = SlotSize - TypeInfo.Width;
-    ArgAddr = Builder.CreateConstInBoundsByteGEP(Addr, Offset, "extend");
-    break;
-  }
-
-  case ABIArgInfo::Direct: {
-    auto AllocSize = getDataLayout().getTypeAllocSize(AI.getCoerceToType());
-    Stride = CharUnits::fromQuantity(AllocSize).alignTo(SlotSize);
-    ArgAddr = Addr;
-    break;
-  }
-
-  case ABIArgInfo::Indirect:
-  case ABIArgInfo::IndirectAliased:
-    Stride = SlotSize;
-    ArgAddr = Builder.CreateElementBitCast(Addr, ArgPtrTy, "indirect");
-    ArgAddr = Address(Builder.CreateLoad(ArgAddr, "indirect.arg"), ArgTy,
-                      TypeInfo.Align);
-    break;
-
-  case ABIArgInfo::Ignore:
-    return Address(llvm::UndefValue::get(ArgPtrTy), ArgTy, TypeInfo.Align);
-  }
-
-  // Update VAList.
-  Address NextPtr = Builder.CreateConstInBoundsByteGEP(Addr, Stride, "ap.next");
-  Builder.CreateStore(NextPtr.getPointer(), VAListAddr);
-
-  return Builder.CreateElementBitCast(ArgAddr, ArgTy, "arg.addr");
-}
-
-void SparcV9ABIInfo::computeInfo(CGFunctionInfo &FI) const {
-  FI.getReturnInfo() = classifyType(FI.getReturnType(), 32 * 8);
-  for (auto &I : FI.arguments())
-    I.info = classifyType(I.type, 16 * 8);
-}
-
-namespace {
-class SparcV9TargetCodeGenInfo : public TargetCodeGenInfo {
-public:
-  SparcV9TargetCodeGenInfo(CodeGenTypes &CGT)
-      : TargetCodeGenInfo(std::make_unique<SparcV9ABIInfo>(CGT)) {}
-
-  int getDwarfEHStackPointer(CodeGen::CodeGenModule &M) const override {
-    return 14;
-  }
-
-  bool initDwarfEHRegSizeTable(CodeGen::CodeGenFunction &CGF,
-                               llvm::Value *Address) const override;
-
-  llvm::Value *decodeReturnAddress(CodeGen::CodeGenFunction &CGF,
-                                   llvm::Value *Address) const override {
-    return CGF.Builder.CreateGEP(CGF.Int8Ty, Address,
-                                 llvm::ConstantInt::get(CGF.Int32Ty, 8));
-  }
-
-  llvm::Value *encodeReturnAddress(CodeGen::CodeGenFunction &CGF,
-                                   llvm::Value *Address) const override {
-    return CGF.Builder.CreateGEP(CGF.Int8Ty, Address,
-                                 llvm::ConstantInt::get(CGF.Int32Ty, -8));
-  }
-};
-} // end anonymous namespace
-
-bool
-SparcV9TargetCodeGenInfo::initDwarfEHRegSizeTable(CodeGen::CodeGenFunction &CGF,
-                                                llvm::Value *Address) const {
-  // This is calculated from the LLVM and GCC tables and verified
-  // against gcc output.  AFAIK all ABIs use the same encoding.
-
-  CodeGen::CGBuilderTy &Builder = CGF.Builder;
-
-  llvm::IntegerType *i8 = CGF.Int8Ty;
-  llvm::Value *Four8 = llvm::ConstantInt::get(i8, 4);
-  llvm::Value *Eight8 = llvm::ConstantInt::get(i8, 8);
-
-  // 0-31: the 8-byte general-purpose registers
-  AssignToArrayRange(Builder, Address, Eight8, 0, 31);
-
-  // 32-63: f0-31, the 4-byte floating-point registers
-  AssignToArrayRange(Builder, Address, Four8, 32, 63);
-
-  //   Y   = 64
-  //   PSR = 65
-  //   WIM = 66
-  //   TBR = 67
-  //   PC  = 68
-  //   NPC = 69
-  //   FSR = 70
-  //   CSR = 71
-  AssignToArrayRange(Builder, Address, Eight8, 64, 71);
-
-  // 72-87: d0-15, the 8-byte floating-point registers
-  AssignToArrayRange(Builder, Address, Eight8, 72, 87);
-
-  return false;
-}
-
-// ARC ABI implementation.
-namespace {
-
-class ARCABIInfo : public DefaultABIInfo {
-  struct CCState {
-    unsigned FreeRegs;
-  };
-
-public:
-  using DefaultABIInfo::DefaultABIInfo;
-
-private:
-  Address EmitVAArg(CodeGenFunction &CGF, Address VAListAddr,
-                    QualType Ty) const override;
-
-  void updateState(const ABIArgInfo &Info, QualType Ty, CCState &State) const {
-    if (!State.FreeRegs)
-      return;
-    if (Info.isIndirect() && Info.getInReg())
-      State.FreeRegs--;
-    else if (Info.isDirect() && Info.getInReg()) {
-      unsigned sz = (getContext().getTypeSize(Ty) + 31) / 32;
-      if (sz < State.FreeRegs)
-        State.FreeRegs -= sz;
-      else
-        State.FreeRegs = 0;
-    }
-  }
-
-  void computeInfo(CGFunctionInfo &FI) const override {
-    CCState State;
-    // ARC uses 8 registers to pass arguments.
-    State.FreeRegs = 8;
-
-    if (!getCXXABI().classifyReturnType(FI))
-      FI.getReturnInfo() = classifyReturnType(FI.getReturnType());
-    updateState(FI.getReturnInfo(), FI.getReturnType(), State);
-    for (auto &I : FI.arguments()) {
-      I.info = classifyArgumentType(I.type, State.FreeRegs);
-      updateState(I.info, I.type, State);
-    }
-  }
-
-  ABIArgInfo getIndirectByRef(QualType Ty, bool HasFreeRegs) const;
-  ABIArgInfo getIndirectByValue(QualType Ty) const;
-  ABIArgInfo classifyArgumentType(QualType Ty, uint8_t FreeRegs) const;
-  ABIArgInfo classifyReturnType(QualType RetTy) const;
-};
-
-class ARCTargetCodeGenInfo : public TargetCodeGenInfo {
-public:
-  ARCTargetCodeGenInfo(CodeGenTypes &CGT)
-      : TargetCodeGenInfo(std::make_unique<ARCABIInfo>(CGT)) {}
-};
-
-
-ABIArgInfo ARCABIInfo::getIndirectByRef(QualType Ty, bool HasFreeRegs) const {
-  return HasFreeRegs ? getNaturalAlignIndirectInReg(Ty) :
-                       getNaturalAlignIndirect(Ty, false);
-}
-
-ABIArgInfo ARCABIInfo::getIndirectByValue(QualType Ty) const {
-  // Compute the byval alignment.
-  const unsigned MinABIStackAlignInBytes = 4;
-  unsigned TypeAlign = getContext().getTypeAlign(Ty) / 8;
-  return ABIArgInfo::getIndirect(CharUnits::fromQuantity(4), /*ByVal=*/true,
-                                 TypeAlign > MinABIStackAlignInBytes);
-}
-
-Address ARCABIInfo::EmitVAArg(CodeGenFunction &CGF, Address VAListAddr,
-                              QualType Ty) const {
-  return emitVoidPtrVAArg(CGF, VAListAddr, Ty, /*indirect*/ false,
-                          getContext().getTypeInfoInChars(Ty),
-                          CharUnits::fromQuantity(4), true);
-}
-
-ABIArgInfo ARCABIInfo::classifyArgumentType(QualType Ty,
-                                            uint8_t FreeRegs) const {
-  // Handle the generic C++ ABI.
-  const RecordType *RT = Ty->getAs<RecordType>();
-  if (RT) {
-    CGCXXABI::RecordArgABI RAA = getRecordArgABI(RT, getCXXABI());
-    if (RAA == CGCXXABI::RAA_Indirect)
-      return getIndirectByRef(Ty, FreeRegs > 0);
-
-    if (RAA == CGCXXABI::RAA_DirectInMemory)
-      return getIndirectByValue(Ty);
-  }
-
-  // Treat an enum type as its underlying type.
-  if (const EnumType *EnumTy = Ty->getAs<EnumType>())
-    Ty = EnumTy->getDecl()->getIntegerType();
-
-  auto SizeInRegs = llvm::alignTo(getContext().getTypeSize(Ty), 32) / 32;
-
-  if (isAggregateTypeForABI(Ty)) {
-    // Structures with flexible arrays are always indirect.
-    if (RT && RT->getDecl()->hasFlexibleArrayMember())
-      return getIndirectByValue(Ty);
-
-    // Ignore empty structs/unions.
-    if (isEmptyRecord(getContext(), Ty, true))
-      return ABIArgInfo::getIgnore();
-
-    llvm::LLVMContext &LLVMContext = getVMContext();
-
-    llvm::IntegerType *Int32 = llvm::Type::getInt32Ty(LLVMContext);
-    SmallVector<llvm::Type *, 3> Elements(SizeInRegs, Int32);
-    llvm::Type *Result = llvm::StructType::get(LLVMContext, Elements);
-
-    return FreeRegs >= SizeInRegs ?
-        ABIArgInfo::getDirectInReg(Result) :
-        ABIArgInfo::getDirect(Result, 0, nullptr, false);
-  }
-
-  if (const auto *EIT = Ty->getAs<BitIntType>())
-    if (EIT->getNumBits() > 64)
-      return getIndirectByValue(Ty);
-
-  return isPromotableIntegerTypeForABI(Ty)
-             ? (FreeRegs >= SizeInRegs ? ABIArgInfo::getExtendInReg(Ty)
-                                       : ABIArgInfo::getExtend(Ty))
-             : (FreeRegs >= SizeInRegs ? ABIArgInfo::getDirectInReg()
-                                       : ABIArgInfo::getDirect());
-}
-
-ABIArgInfo ARCABIInfo::classifyReturnType(QualType RetTy) const {
-  if (RetTy->isAnyComplexType())
-    return ABIArgInfo::getDirectInReg();
-
-  // Arguments of size > 4 registers are indirect.
-  auto RetSize = llvm::alignTo(getContext().getTypeSize(RetTy), 32) / 32;
-  if (RetSize > 4)
-    return getIndirectByRef(RetTy, /*HasFreeRegs*/ true);
-
-  return DefaultABIInfo::classifyReturnType(RetTy);
-}
-
-} // End anonymous namespace.
-
-//===----------------------------------------------------------------------===//
-// XCore ABI Implementation
-//===----------------------------------------------------------------------===//
-
-namespace {
-
-/// A SmallStringEnc instance is used to build up the TypeString by passing
-/// it by reference between functions that append to it.
-typedef llvm::SmallString<128> SmallStringEnc;
-
-/// TypeStringCache caches the meta encodings of Types.
-///
-/// The reason for caching TypeStrings is two fold:
-///   1. To cache a type's encoding for later uses;
-///   2. As a means to break recursive member type inclusion.
-///
-/// A cache Entry can have a Status of:
-///   NonRecursive:   The type encoding is not recursive;
-///   Recursive:      The type encoding is recursive;
-///   Incomplete:     An incomplete TypeString;
-///   IncompleteUsed: An incomplete TypeString that has been used in a
-///                   Recursive type encoding.
-///
-/// A NonRecursive entry will have all of its sub-members expanded as fully
-/// as possible. Whilst it may contain types which are recursive, the type
-/// itself is not recursive and thus its encoding may be safely used whenever
-/// the type is encountered.
-///
-/// A Recursive entry will have all of its sub-members expanded as fully as
-/// possible. The type itself is recursive and it may contain other types which
-/// are recursive. The Recursive encoding must not be used during the expansion
-/// of a recursive type's recursive branch. For simplicity the code uses
-/// IncompleteCount to reject all usage of Recursive encodings for member types.
-///
-/// An Incomplete entry is always a RecordType and only encodes its
-/// identifier e.g. "s(S){}". Incomplete 'StubEnc' entries are ephemeral and
-/// are placed into the cache during type expansion as a means to identify and
-/// handle recursive inclusion of types as sub-members. If there is recursion
-/// the entry becomes IncompleteUsed.
-///
-/// During the expansion of a RecordType's members:
-///
-///   If the cache contains a NonRecursive encoding for the member type, the
-///   cached encoding is used;
-///
-///   If the cache contains a Recursive encoding for the member type, the
-///   cached encoding is 'Swapped' out, as it may be incorrect, and...
-///
-///   If the member is a RecordType, an Incomplete encoding is placed into the
-///   cache to break potential recursive inclusion of itself as a sub-member;
-///
-///   Once a member RecordType has been expanded, its temporary incomplete
-///   entry is removed from the cache. If a Recursive encoding was swapped out
-///   it is swapped back in;
-///
-///   If an incomplete entry is used to expand a sub-member, the incomplete
-///   entry is marked as IncompleteUsed. The cache keeps count of how many
-///   IncompleteUsed entries it currently contains in IncompleteUsedCount;
-///
-///   If a member's encoding is found to be a NonRecursive or Recursive viz:
-///   IncompleteUsedCount==0, the member's encoding is added to the cache.
-///   Else the member is part of a recursive type and thus the recursion has
-///   been exited too soon for the encoding to be correct for the member.
-///
-class TypeStringCache {
-  enum Status {NonRecursive, Recursive, Incomplete, IncompleteUsed};
-  struct Entry {
-    std::string Str;     // The encoded TypeString for the type.
-    enum Status State;   // Information about the encoding in 'Str'.
-    std::string Swapped; // A temporary place holder for a Recursive encoding
-                         // during the expansion of RecordType's members.
-  };
-  std::map<const IdentifierInfo *, struct Entry> Map;
-  unsigned IncompleteCount;     // Number of Incomplete entries in the Map.
-  unsigned IncompleteUsedCount; // Number of IncompleteUsed entries in the Map.
-public:
-  TypeStringCache() : IncompleteCount(0), IncompleteUsedCount(0) {}
-  void addIncomplete(const IdentifierInfo *ID, std::string StubEnc);
-  bool removeIncomplete(const IdentifierInfo *ID);
-  void addIfComplete(const IdentifierInfo *ID, StringRef Str,
-                     bool IsRecursive);
-  StringRef lookupStr(const IdentifierInfo *ID);
-};
-
-/// TypeString encodings for enum & union fields must be order.
-/// FieldEncoding is a helper for this ordering process.
-class FieldEncoding {
-  bool HasName;
-  std::string Enc;
-public:
-  FieldEncoding(bool b, SmallStringEnc &e) : HasName(b), Enc(e.c_str()) {}
-  StringRef str() { return Enc; }
-  bool operator<(const FieldEncoding &rhs) const {
-    if (HasName != rhs.HasName) return HasName;
-    return Enc < rhs.Enc;
-  }
-};
-
-class XCoreABIInfo : public DefaultABIInfo {
-public:
-  XCoreABIInfo(CodeGen::CodeGenTypes &CGT) : DefaultABIInfo(CGT) {}
-  Address EmitVAArg(CodeGenFunction &CGF, Address VAListAddr,
-                    QualType Ty) const override;
-};
-
-class XCoreTargetCodeGenInfo : public TargetCodeGenInfo {
-  mutable TypeStringCache TSC;
-  void emitTargetMD(const Decl *D, llvm::GlobalValue *GV,
-                    const CodeGen::CodeGenModule &M) const;
-
-public:
-  XCoreTargetCodeGenInfo(CodeGenTypes &CGT)
-      : TargetCodeGenInfo(std::make_unique<XCoreABIInfo>(CGT)) {}
-  void emitTargetMetadata(CodeGen::CodeGenModule &CGM,
-                          const llvm::MapVector<GlobalDecl, StringRef>
-                              &MangledDeclNames) const override;
-};
-
-} // End anonymous namespace.
-
-// TODO: this implementation is likely now redundant with the default
-// EmitVAArg.
-Address XCoreABIInfo::EmitVAArg(CodeGenFunction &CGF, Address VAListAddr,
-                                QualType Ty) const {
-  CGBuilderTy &Builder = CGF.Builder;
-
-  // Get the VAList.
-  CharUnits SlotSize = CharUnits::fromQuantity(4);
-  Address AP = Address(Builder.CreateLoad(VAListAddr),
-                       getVAListElementType(CGF), SlotSize);
-
-  // Handle the argument.
-  ABIArgInfo AI = classifyArgumentType(Ty);
-  CharUnits TypeAlign = getContext().getTypeAlignInChars(Ty);
-  llvm::Type *ArgTy = CGT.ConvertType(Ty);
-  if (AI.canHaveCoerceToType() && !AI.getCoerceToType())
-    AI.setCoerceToType(ArgTy);
-  llvm::Type *ArgPtrTy = llvm::PointerType::getUnqual(ArgTy);
-
-  Address Val = Address::invalid();
-  CharUnits ArgSize = CharUnits::Zero();
-  switch (AI.getKind()) {
-  case ABIArgInfo::Expand:
-  case ABIArgInfo::CoerceAndExpand:
-  case ABIArgInfo::InAlloca:
-    llvm_unreachable("Unsupported ABI kind for va_arg");
-  case ABIArgInfo::Ignore:
-    Val = Address(llvm::UndefValue::get(ArgPtrTy), ArgTy, TypeAlign);
-    ArgSize = CharUnits::Zero();
-    break;
-  case ABIArgInfo::Extend:
-  case ABIArgInfo::Direct:
-    Val = Builder.CreateElementBitCast(AP, ArgTy);
-    ArgSize = CharUnits::fromQuantity(
-        getDataLayout().getTypeAllocSize(AI.getCoerceToType()));
-    ArgSize = ArgSize.alignTo(SlotSize);
-    break;
-  case ABIArgInfo::Indirect:
-  case ABIArgInfo::IndirectAliased:
-    Val = Builder.CreateElementBitCast(AP, ArgPtrTy);
-    Val = Address(Builder.CreateLoad(Val), ArgTy, TypeAlign);
-    ArgSize = SlotSize;
-    break;
-  }
-
-  // Increment the VAList.
-  if (!ArgSize.isZero()) {
-    Address APN = Builder.CreateConstInBoundsByteGEP(AP, ArgSize);
-    Builder.CreateStore(APN.getPointer(), VAListAddr);
-  }
-
-  return Val;
-}
-
-/// During the expansion of a RecordType, an incomplete TypeString is placed
-/// into the cache as a means to identify and break recursion.
-/// If there is a Recursive encoding in the cache, it is swapped out and will
-/// be reinserted by removeIncomplete().
-/// All other types of encoding should have been used rather than arriving here.
-void TypeStringCache::addIncomplete(const IdentifierInfo *ID,
-                                    std::string StubEnc) {
-  if (!ID)
-    return;
-  Entry &E = Map[ID];
-  assert( (E.Str.empty() || E.State == Recursive) &&
-         "Incorrectly use of addIncomplete");
-  assert(!StubEnc.empty() && "Passing an empty string to addIncomplete()");
-  E.Swapped.swap(E.Str); // swap out the Recursive
-  E.Str.swap(StubEnc);
-  E.State = Incomplete;
-  ++IncompleteCount;
-}
-
-/// Once the RecordType has been expanded, the temporary incomplete TypeString
-/// must be removed from the cache.
-/// If a Recursive was swapped out by addIncomplete(), it will be replaced.
-/// Returns true if the RecordType was defined recursively.
-bool TypeStringCache::removeIncomplete(const IdentifierInfo *ID) {
-  if (!ID)
-    return false;
-  auto I = Map.find(ID);
-  assert(I != Map.end() && "Entry not present");
-  Entry &E = I->second;
-  assert( (E.State == Incomplete ||
-           E.State == IncompleteUsed) &&
-         "Entry must be an incomplete type");
-  bool IsRecursive = false;
-  if (E.State == IncompleteUsed) {
-    // We made use of our Incomplete encoding, thus we are recursive.
-    IsRecursive = true;
-    --IncompleteUsedCount;
-  }
-  if (E.Swapped.empty())
-    Map.erase(I);
-  else {
-    // Swap the Recursive back.
-    E.Swapped.swap(E.Str);
-    E.Swapped.clear();
-    E.State = Recursive;
-  }
-  --IncompleteCount;
-  return IsRecursive;
-}
-
-/// Add the encoded TypeString to the cache only if it is NonRecursive or
-/// Recursive (viz: all sub-members were expanded as fully as possible).
-void TypeStringCache::addIfComplete(const IdentifierInfo *ID, StringRef Str,
-                                    bool IsRecursive) {
-  if (!ID || IncompleteUsedCount)
-    return; // No key or it is an incomplete sub-type so don't add.
-  Entry &E = Map[ID];
-  if (IsRecursive && !E.Str.empty()) {
-    assert(E.State==Recursive && E.Str.size() == Str.size() &&
-           "This is not the same Recursive entry");
-    // The parent container was not recursive after all, so we could have used
-    // this Recursive sub-member entry after all, but we assumed the worse when
-    // we started viz: IncompleteCount!=0.
-    return;
-  }
-  assert(E.Str.empty() && "Entry already present");
-  E.Str = Str.str();
-  E.State = IsRecursive? Recursive : NonRecursive;
-}
-
-/// Return a cached TypeString encoding for the ID. If there isn't one, or we
-/// are recursively expanding a type (IncompleteCount != 0) and the cached
-/// encoding is Recursive, return an empty StringRef.
-StringRef TypeStringCache::lookupStr(const IdentifierInfo *ID) {
-  if (!ID)
-    return StringRef();   // We have no key.
-  auto I = Map.find(ID);
-  if (I == Map.end())
-    return StringRef();   // We have no encoding.
-  Entry &E = I->second;
-  if (E.State == Recursive && IncompleteCount)
-    return StringRef();   // We don't use Recursive encodings for member types.
-
-  if (E.State == Incomplete) {
-    // The incomplete type is being used to break out of recursion.
-    E.State = IncompleteUsed;
-    ++IncompleteUsedCount;
-  }
-  return E.Str;
-}
-
-/// The XCore ABI includes a type information section that communicates symbol
-/// type information to the linker. The linker uses this information to verify
-/// safety/correctness of things such as array bound and pointers et al.
-/// The ABI only requires C (and XC) language modules to emit TypeStrings.
-/// This type information (TypeString) is emitted into meta data for all global
-/// symbols: definitions, declarations, functions & variables.
-///
-/// The TypeString carries type, qualifier, name, size & value details.
-/// Please see 'Tools Development Guide' section 2.16.2 for format details:
-/// https://www.xmos.com/download/public/Tools-Development-Guide%28X9114A%29.pdf
-/// The output is tested by test/CodeGen/xcore-stringtype.c.
-///
-static bool getTypeString(SmallStringEnc &Enc, const Decl *D,
-                          const CodeGen::CodeGenModule &CGM,
-                          TypeStringCache &TSC);
-
-/// XCore uses emitTargetMD to emit TypeString metadata for global symbols.
-void XCoreTargetCodeGenInfo::emitTargetMD(
-    const Decl *D, llvm::GlobalValue *GV,
-    const CodeGen::CodeGenModule &CGM) const {
-  SmallStringEnc Enc;
-  if (getTypeString(Enc, D, CGM, TSC)) {
-    llvm::LLVMContext &Ctx = CGM.getModule().getContext();
-    llvm::Metadata *MDVals[] = {llvm::ConstantAsMetadata::get(GV),
-                                llvm::MDString::get(Ctx, Enc.str())};
-    llvm::NamedMDNode *MD =
-      CGM.getModule().getOrInsertNamedMetadata("xcore.typestrings");
-    MD->addOperand(llvm::MDNode::get(Ctx, MDVals));
-  }
-}
-
-void XCoreTargetCodeGenInfo::emitTargetMetadata(
-    CodeGen::CodeGenModule &CGM,
-    const llvm::MapVector<GlobalDecl, StringRef> &MangledDeclNames) const {
-  // Warning, new MangledDeclNames may be appended within this loop.
-  // We rely on MapVector insertions adding new elements to the end
-  // of the container.
-  for (unsigned I = 0; I != MangledDeclNames.size(); ++I) {
-    auto Val = *(MangledDeclNames.begin() + I);
-    llvm::GlobalValue *GV = CGM.GetGlobalValue(Val.second);
-    if (GV) {
-      const Decl *D = Val.first.getDecl()->getMostRecentDecl();
-      emitTargetMD(D, GV, CGM);
-    }
-  }
-}
-
-//===----------------------------------------------------------------------===//
-// Base ABI and target codegen info implementation common between SPIR and
-// SPIR-V.
-//===----------------------------------------------------------------------===//
-
-namespace {
-class CommonSPIRABIInfo : public DefaultABIInfo {
-public:
-  CommonSPIRABIInfo(CodeGenTypes &CGT) : DefaultABIInfo(CGT) { setCCs(); }
-
-private:
-  void setCCs();
-};
-
-class SPIRVABIInfo : public CommonSPIRABIInfo {
-public:
-  SPIRVABIInfo(CodeGenTypes &CGT) : CommonSPIRABIInfo(CGT) {}
-  void computeInfo(CGFunctionInfo &FI) const override;
-
-private:
-  ABIArgInfo classifyKernelArgumentType(QualType Ty) const;
-};
-} // end anonymous namespace
-namespace {
-class CommonSPIRTargetCodeGenInfo : public TargetCodeGenInfo {
-public:
-  CommonSPIRTargetCodeGenInfo(CodeGen::CodeGenTypes &CGT)
-      : TargetCodeGenInfo(std::make_unique<CommonSPIRABIInfo>(CGT)) {}
-  CommonSPIRTargetCodeGenInfo(std::unique_ptr<ABIInfo> ABIInfo)
-      : TargetCodeGenInfo(std::move(ABIInfo)) {}
-
-  LangAS getASTAllocaAddressSpace() const override {
-    return getLangASFromTargetAS(
-        getABIInfo().getDataLayout().getAllocaAddrSpace());
-  }
-
-  unsigned getOpenCLKernelCallingConv() const override;
-  llvm::Type *getOpenCLType(CodeGenModule &CGM, const Type *T) const override;
-};
-class SPIRVTargetCodeGenInfo : public CommonSPIRTargetCodeGenInfo {
-public:
-  SPIRVTargetCodeGenInfo(CodeGen::CodeGenTypes &CGT)
-      : CommonSPIRTargetCodeGenInfo(std::make_unique<SPIRVABIInfo>(CGT)) {}
-  void setCUDAKernelCallingConvention(const FunctionType *&FT) const override;
-};
-} // End anonymous namespace.
-
-void CommonSPIRABIInfo::setCCs() {
-  assert(getRuntimeCC() == llvm::CallingConv::C);
-  RuntimeCC = llvm::CallingConv::SPIR_FUNC;
-}
-
-ABIArgInfo SPIRVABIInfo::classifyKernelArgumentType(QualType Ty) const {
-  if (getContext().getLangOpts().CUDAIsDevice) {
-    // Coerce pointer arguments with default address space to CrossWorkGroup
-    // pointers for HIPSPV/CUDASPV. When the language mode is HIP/CUDA, the
-    // SPIRTargetInfo maps cuda_device to SPIR-V's CrossWorkGroup address space.
-    llvm::Type *LTy = CGT.ConvertType(Ty);
-    auto DefaultAS = getContext().getTargetAddressSpace(LangAS::Default);
-    auto GlobalAS = getContext().getTargetAddressSpace(LangAS::cuda_device);
-    auto *PtrTy = llvm::dyn_cast<llvm::PointerType>(LTy);
-    if (PtrTy && PtrTy->getAddressSpace() == DefaultAS) {
-      LTy = llvm::PointerType::getWithSamePointeeType(PtrTy, GlobalAS);
-      return ABIArgInfo::getDirect(LTy, 0, nullptr, false);
-    }
-
-    // Force copying aggregate type in kernel arguments by value when
-    // compiling CUDA targeting SPIR-V. This is required for the object
-    // copied to be valid on the device.
-    // This behavior follows the CUDA spec
-    // https://docs.nvidia.com/cuda/cuda-c-programming-guide/index.html#global-function-argument-processing,
-    // and matches the NVPTX implementation.
-    if (isAggregateTypeForABI(Ty))
-      return getNaturalAlignIndirect(Ty, /* byval */ true);
-  }
-  return classifyArgumentType(Ty);
-}
-
-void SPIRVABIInfo::computeInfo(CGFunctionInfo &FI) const {
-  // The logic is same as in DefaultABIInfo with an exception on the kernel
-  // arguments handling.
-  llvm::CallingConv::ID CC = FI.getCallingConvention();
-
-  if (!getCXXABI().classifyReturnType(FI))
-    FI.getReturnInfo() = classifyReturnType(FI.getReturnType());
-
-  for (auto &I : FI.arguments()) {
-    if (CC == llvm::CallingConv::SPIR_KERNEL) {
-      I.info = classifyKernelArgumentType(I.type);
-    } else {
-      I.info = classifyArgumentType(I.type);
-    }
-  }
-}
-
-namespace clang {
-namespace CodeGen {
-void computeSPIRKernelABIInfo(CodeGenModule &CGM, CGFunctionInfo &FI) {
-  if (CGM.getTarget().getTriple().isSPIRV())
-    SPIRVABIInfo(CGM.getTypes()).computeInfo(FI);
-  else
-    CommonSPIRABIInfo(CGM.getTypes()).computeInfo(FI);
-}
-}
-}
-
-unsigned CommonSPIRTargetCodeGenInfo::getOpenCLKernelCallingConv() const {
-  return llvm::CallingConv::SPIR_KERNEL;
-}
-
-void SPIRVTargetCodeGenInfo::setCUDAKernelCallingConvention(
-    const FunctionType *&FT) const {
-  // Convert HIP kernels to SPIR-V kernels.
-  if (getABIInfo().getContext().getLangOpts().HIP) {
-    FT = getABIInfo().getContext().adjustFunctionType(
-        FT, FT->getExtInfo().withCallingConv(CC_OpenCLKernel));
-    return;
-  }
-}
-
-static bool appendType(SmallStringEnc &Enc, QualType QType,
-                       const CodeGen::CodeGenModule &CGM,
-                       TypeStringCache &TSC);
-
-/// Helper function for appendRecordType().
-/// Builds a SmallVector containing the encoded field types in declaration
-/// order.
-static bool extractFieldType(SmallVectorImpl<FieldEncoding> &FE,
-                             const RecordDecl *RD,
-                             const CodeGen::CodeGenModule &CGM,
-                             TypeStringCache &TSC) {
-  for (const auto *Field : RD->fields()) {
-    SmallStringEnc Enc;
-    Enc += "m(";
-    Enc += Field->getName();
-    Enc += "){";
-    if (Field->isBitField()) {
-      Enc += "b(";
-      llvm::raw_svector_ostream OS(Enc);
-      OS << Field->getBitWidthValue(CGM.getContext());
-      Enc += ':';
-    }
-    if (!appendType(Enc, Field->getType(), CGM, TSC))
-      return false;
-    if (Field->isBitField())
-      Enc += ')';
-    Enc += '}';
-    FE.emplace_back(!Field->getName().empty(), Enc);
-  }
-  return true;
-}
-
-/// Appends structure and union types to Enc and adds encoding to cache.
-/// Recursively calls appendType (via extractFieldType) for each field.
-/// Union types have their fields ordered according to the ABI.
-static bool appendRecordType(SmallStringEnc &Enc, const RecordType *RT,
-                             const CodeGen::CodeGenModule &CGM,
-                             TypeStringCache &TSC, const IdentifierInfo *ID) {
-  // Append the cached TypeString if we have one.
-  StringRef TypeString = TSC.lookupStr(ID);
-  if (!TypeString.empty()) {
-    Enc += TypeString;
-    return true;
-  }
-
-  // Start to emit an incomplete TypeString.
-  size_t Start = Enc.size();
-  Enc += (RT->isUnionType()? 'u' : 's');
-  Enc += '(';
-  if (ID)
-    Enc += ID->getName();
-  Enc += "){";
-
-  // We collect all encoded fields and order as necessary.
-  bool IsRecursive = false;
-  const RecordDecl *RD = RT->getDecl()->getDefinition();
-  if (RD && !RD->field_empty()) {
-    // An incomplete TypeString stub is placed in the cache for this RecordType
-    // so that recursive calls to this RecordType will use it whilst building a
-    // complete TypeString for this RecordType.
-    SmallVector<FieldEncoding, 16> FE;
-    std::string StubEnc(Enc.substr(Start).str());
-    StubEnc += '}';  // StubEnc now holds a valid incomplete TypeString.
-    TSC.addIncomplete(ID, std::move(StubEnc));
-    if (!extractFieldType(FE, RD, CGM, TSC)) {
-      (void) TSC.removeIncomplete(ID);
-      return false;
-    }
-    IsRecursive = TSC.removeIncomplete(ID);
-    // The ABI requires unions to be sorted but not structures.
-    // See FieldEncoding::operator< for sort algorithm.
-    if (RT->isUnionType())
-      llvm::sort(FE);
-    // We can now complete the TypeString.
-    unsigned E = FE.size();
-    for (unsigned I = 0; I != E; ++I) {
-      if (I)
-        Enc += ',';
-      Enc += FE[I].str();
-    }
-  }
-  Enc += '}';
-  TSC.addIfComplete(ID, Enc.substr(Start), IsRecursive);
-  return true;
-}
-
-/// Appends enum types to Enc and adds the encoding to the cache.
-static bool appendEnumType(SmallStringEnc &Enc, const EnumType *ET,
-                           TypeStringCache &TSC,
-                           const IdentifierInfo *ID) {
-  // Append the cached TypeString if we have one.
-  StringRef TypeString = TSC.lookupStr(ID);
-  if (!TypeString.empty()) {
-    Enc += TypeString;
-    return true;
-  }
-
-  size_t Start = Enc.size();
-  Enc += "e(";
-  if (ID)
-    Enc += ID->getName();
-  Enc += "){";
-
-  // We collect all encoded enumerations and order them alphanumerically.
-  if (const EnumDecl *ED = ET->getDecl()->getDefinition()) {
-    SmallVector<FieldEncoding, 16> FE;
-    for (auto I = ED->enumerator_begin(), E = ED->enumerator_end(); I != E;
-         ++I) {
-      SmallStringEnc EnumEnc;
-      EnumEnc += "m(";
-      EnumEnc += I->getName();
-      EnumEnc += "){";
-      I->getInitVal().toString(EnumEnc);
-      EnumEnc += '}';
-      FE.push_back(FieldEncoding(!I->getName().empty(), EnumEnc));
-    }
-    llvm::sort(FE);
-    unsigned E = FE.size();
-    for (unsigned I = 0; I != E; ++I) {
-      if (I)
-        Enc += ',';
-      Enc += FE[I].str();
-    }
-  }
-  Enc += '}';
-  TSC.addIfComplete(ID, Enc.substr(Start), false);
-  return true;
-}
-
-/// Appends type's qualifier to Enc.
-/// This is done prior to appending the type's encoding.
-static void appendQualifier(SmallStringEnc &Enc, QualType QT) {
-  // Qualifiers are emitted in alphabetical order.
-  static const char *const Table[]={"","c:","r:","cr:","v:","cv:","rv:","crv:"};
-  int Lookup = 0;
-  if (QT.isConstQualified())
-    Lookup += 1<<0;
-  if (QT.isRestrictQualified())
-    Lookup += 1<<1;
-  if (QT.isVolatileQualified())
-    Lookup += 1<<2;
-  Enc += Table[Lookup];
-}
-
-/// Appends built-in types to Enc.
-static bool appendBuiltinType(SmallStringEnc &Enc, const BuiltinType *BT) {
-  const char *EncType;
-  switch (BT->getKind()) {
-    case BuiltinType::Void:
-      EncType = "0";
-      break;
-    case BuiltinType::Bool:
-      EncType = "b";
-      break;
-    case BuiltinType::Char_U:
-      EncType = "uc";
-      break;
-    case BuiltinType::UChar:
-      EncType = "uc";
-      break;
-    case BuiltinType::SChar:
-      EncType = "sc";
-      break;
-    case BuiltinType::UShort:
-      EncType = "us";
-      break;
-    case BuiltinType::Short:
-      EncType = "ss";
-      break;
-    case BuiltinType::UInt:
-      EncType = "ui";
-      break;
-    case BuiltinType::Int:
-      EncType = "si";
-      break;
-    case BuiltinType::ULong:
-      EncType = "ul";
-      break;
-    case BuiltinType::Long:
-      EncType = "sl";
-      break;
-    case BuiltinType::ULongLong:
-      EncType = "ull";
-      break;
-    case BuiltinType::LongLong:
-      EncType = "sll";
-      break;
-    case BuiltinType::Float:
-      EncType = "ft";
-      break;
-    case BuiltinType::Double:
-      EncType = "d";
-      break;
-    case BuiltinType::LongDouble:
-      EncType = "ld";
-      break;
-    default:
-      return false;
-  }
-  Enc += EncType;
-  return true;
-}
-
-/// Appends a pointer encoding to Enc before calling appendType for the pointee.
-static bool appendPointerType(SmallStringEnc &Enc, const PointerType *PT,
-                              const CodeGen::CodeGenModule &CGM,
-                              TypeStringCache &TSC) {
-  Enc += "p(";
-  if (!appendType(Enc, PT->getPointeeType(), CGM, TSC))
-    return false;
-  Enc += ')';
-  return true;
-}
-
-/// Appends array encoding to Enc before calling appendType for the element.
-static bool appendArrayType(SmallStringEnc &Enc, QualType QT,
-                            const ArrayType *AT,
-                            const CodeGen::CodeGenModule &CGM,
-                            TypeStringCache &TSC, StringRef NoSizeEnc) {
-  if (AT->getSizeModifier() != ArrayType::Normal)
-    return false;
-  Enc += "a(";
-  if (const ConstantArrayType *CAT = dyn_cast<ConstantArrayType>(AT))
-    CAT->getSize().toStringUnsigned(Enc);
-  else
-    Enc += NoSizeEnc; // Global arrays use "*", otherwise it is "".
-  Enc += ':';
-  // The Qualifiers should be attached to the type rather than the array.
-  appendQualifier(Enc, QT);
-  if (!appendType(Enc, AT->getElementType(), CGM, TSC))
-    return false;
-  Enc += ')';
-  return true;
-}
-
-/// Appends a function encoding to Enc, calling appendType for the return type
-/// and the arguments.
-static bool appendFunctionType(SmallStringEnc &Enc, const FunctionType *FT,
-                             const CodeGen::CodeGenModule &CGM,
-                             TypeStringCache &TSC) {
-  Enc += "f{";
-  if (!appendType(Enc, FT->getReturnType(), CGM, TSC))
-    return false;
-  Enc += "}(";
-  if (const FunctionProtoType *FPT = FT->getAs<FunctionProtoType>()) {
-    // N.B. we are only interested in the adjusted param types.
-    auto I = FPT->param_type_begin();
-    auto E = FPT->param_type_end();
-    if (I != E) {
-      do {
-        if (!appendType(Enc, *I, CGM, TSC))
-          return false;
-        ++I;
-        if (I != E)
-          Enc += ',';
-      } while (I != E);
-      if (FPT->isVariadic())
-        Enc += ",va";
-    } else {
-      if (FPT->isVariadic())
-        Enc += "va";
-      else
-        Enc += '0';
-    }
-  }
-  Enc += ')';
-  return true;
-}
-
-/// Handles the type's qualifier before dispatching a call to handle specific
-/// type encodings.
-static bool appendType(SmallStringEnc &Enc, QualType QType,
-                       const CodeGen::CodeGenModule &CGM,
-                       TypeStringCache &TSC) {
-
-  QualType QT = QType.getCanonicalType();
-
-  if (const ArrayType *AT = QT->getAsArrayTypeUnsafe())
-    // The Qualifiers should be attached to the type rather than the array.
-    // Thus we don't call appendQualifier() here.
-    return appendArrayType(Enc, QT, AT, CGM, TSC, "");
-
-  appendQualifier(Enc, QT);
-
-  if (const BuiltinType *BT = QT->getAs<BuiltinType>())
-    return appendBuiltinType(Enc, BT);
-
-  if (const PointerType *PT = QT->getAs<PointerType>())
-    return appendPointerType(Enc, PT, CGM, TSC);
-
-  if (const EnumType *ET = QT->getAs<EnumType>())
-    return appendEnumType(Enc, ET, TSC, QT.getBaseTypeIdentifier());
-
-  if (const RecordType *RT = QT->getAsStructureType())
-    return appendRecordType(Enc, RT, CGM, TSC, QT.getBaseTypeIdentifier());
-
-  if (const RecordType *RT = QT->getAsUnionType())
-    return appendRecordType(Enc, RT, CGM, TSC, QT.getBaseTypeIdentifier());
-
-  if (const FunctionType *FT = QT->getAs<FunctionType>())
-    return appendFunctionType(Enc, FT, CGM, TSC);
-
-  return false;
-}
-
-static bool getTypeString(SmallStringEnc &Enc, const Decl *D,
-                          const CodeGen::CodeGenModule &CGM,
-                          TypeStringCache &TSC) {
-  if (!D)
-    return false;
-
-  if (const FunctionDecl *FD = dyn_cast<FunctionDecl>(D)) {
-    if (FD->getLanguageLinkage() != CLanguageLinkage)
-      return false;
-    return appendType(Enc, FD->getType(), CGM, TSC);
-  }
-
-  if (const VarDecl *VD = dyn_cast<VarDecl>(D)) {
-    if (VD->getLanguageLinkage() != CLanguageLinkage)
-      return false;
-    QualType QT = VD->getType().getCanonicalType();
-    if (const ArrayType *AT = QT->getAsArrayTypeUnsafe()) {
-      // Global ArrayTypes are given a size of '*' if the size is unknown.
-      // The Qualifiers should be attached to the type rather than the array.
-      // Thus we don't call appendQualifier() here.
-      return appendArrayType(Enc, QT, AT, CGM, TSC, "*");
-    }
-    return appendType(Enc, QT, CGM, TSC);
-  }
-  return false;
-}
-
-/// Construct a SPIR-V target extension type for the given OpenCL image type.
-static llvm::Type *getSPIRVImageType(llvm::LLVMContext &Ctx, StringRef BaseType,
-                                     StringRef OpenCLName,
-                                     unsigned AccessQualifier) {
-  // These parameters compare to the operands of OpTypeImage (see
-  // https://registry.khronos.org/SPIR-V/specs/unified1/SPIRV.html#OpTypeImage
-  // for more details). The first 6 integer parameters all default to 0, and
-  // will be changed to 1 only for the image type(s) that set the parameter to
-  // one. The 7th integer parameter is the access qualifier, which is tacked on
-  // at the end.
-  SmallVector<unsigned, 7> IntParams = {0, 0, 0, 0, 0, 0};
-
-  // Choose the dimension of the image--this corresponds to the Dim enum in
-  // SPIR-V (first integer parameter of OpTypeImage).
-  if (OpenCLName.startswith("image2d"))
-    IntParams[0] = 1; // 1D
-  else if (OpenCLName.startswith("image3d"))
-    IntParams[0] = 2; // 2D
-  else if (OpenCLName == "image1d_buffer")
-    IntParams[0] = 5; // Buffer
-  else
-    assert(OpenCLName.startswith("image1d") && "Unknown image type");
-
-  // Set the other integer parameters of OpTypeImage if necessary. Note that the
-  // OpenCL image types don't provide any information for the Sampled or
-  // Image Format parameters.
-  if (OpenCLName.contains("_depth"))
-    IntParams[1] = 1;
-  if (OpenCLName.contains("_array"))
-    IntParams[2] = 1;
-  if (OpenCLName.contains("_msaa"))
-    IntParams[3] = 1;
-
-  // Access qualifier
-  IntParams.push_back(AccessQualifier);
-
-  return llvm::TargetExtType::get(Ctx, BaseType, {llvm::Type::getVoidTy(Ctx)},
-                                  IntParams);
-}
-
-llvm::Type *CommonSPIRTargetCodeGenInfo::getOpenCLType(CodeGenModule &CGM,
-                                                       const Type *Ty) const {
-  llvm::LLVMContext &Ctx = CGM.getLLVMContext();
-  if (auto *PipeTy = dyn_cast<PipeType>(Ty))
-    return llvm::TargetExtType::get(Ctx, "spirv.Pipe", {},
-                                    {!PipeTy->isReadOnly()});
-  if (auto *BuiltinTy = dyn_cast<BuiltinType>(Ty)) {
-    enum AccessQualifier : unsigned { AQ_ro = 0, AQ_wo = 1, AQ_rw = 2 };
-    switch (BuiltinTy->getKind()) {
-#define IMAGE_TYPE(ImgType, Id, SingletonId, Access, Suffix)                   \
-    case BuiltinType::Id:                                                      \
-      return getSPIRVImageType(Ctx, "spirv.Image", #ImgType, AQ_##Suffix);
-#include "clang/Basic/OpenCLImageTypes.def"
-    case BuiltinType::OCLSampler:
-      return llvm::TargetExtType::get(Ctx, "spirv.Sampler");
-    case BuiltinType::OCLEvent:
-      return llvm::TargetExtType::get(Ctx, "spirv.Event");
-    case BuiltinType::OCLClkEvent:
-      return llvm::TargetExtType::get(Ctx, "spirv.DeviceEvent");
-    case BuiltinType::OCLQueue:
-      return llvm::TargetExtType::get(Ctx, "spirv.Queue");
-    case BuiltinType::OCLReserveID:
-      return llvm::TargetExtType::get(Ctx, "spirv.ReserveId");
-#define INTEL_SUBGROUP_AVC_TYPE(Name, Id)                                      \
-    case BuiltinType::OCLIntelSubgroupAVC##Id:                                 \
-      return llvm::TargetExtType::get(Ctx, "spirv.Avc" #Id "INTEL");
-#include "clang/Basic/OpenCLExtensionTypes.def"
-    default:
-      return nullptr;
-    }
-  }
-
-  return nullptr;
-}
-//===----------------------------------------------------------------------===//
-// RISC-V ABI Implementation
-//===----------------------------------------------------------------------===//
-
-namespace {
-class RISCVABIInfo : public DefaultABIInfo {
-private:
-  // Size of the integer ('x') registers in bits.
-  unsigned XLen;
-  // Size of the floating point ('f') registers in bits. Note that the target
-  // ISA might have a wider FLen than the selected ABI (e.g. an RV32IF target
-  // with soft float ABI has FLen==0).
-  unsigned FLen;
-  static const int NumArgGPRs = 8;
-  static const int NumArgFPRs = 8;
-  bool detectFPCCEligibleStructHelper(QualType Ty, CharUnits CurOff,
-                                      llvm::Type *&Field1Ty,
-                                      CharUnits &Field1Off,
-                                      llvm::Type *&Field2Ty,
-                                      CharUnits &Field2Off) const;
-
-public:
-  RISCVABIInfo(CodeGen::CodeGenTypes &CGT, unsigned XLen, unsigned FLen)
-      : DefaultABIInfo(CGT), XLen(XLen), FLen(FLen) {}
-
-  // DefaultABIInfo's classifyReturnType and classifyArgumentType are
-  // non-virtual, but computeInfo is virtual, so we overload it.
-  void computeInfo(CGFunctionInfo &FI) const override;
-
-  ABIArgInfo classifyArgumentType(QualType Ty, bool IsFixed, int &ArgGPRsLeft,
-                                  int &ArgFPRsLeft) const;
-  ABIArgInfo classifyReturnType(QualType RetTy) const;
-
-  Address EmitVAArg(CodeGenFunction &CGF, Address VAListAddr,
-                    QualType Ty) const override;
-
-  ABIArgInfo extendType(QualType Ty) const;
-
-  bool detectFPCCEligibleStruct(QualType Ty, llvm::Type *&Field1Ty,
-                                CharUnits &Field1Off, llvm::Type *&Field2Ty,
-                                CharUnits &Field2Off, int &NeededArgGPRs,
-                                int &NeededArgFPRs) const;
-  ABIArgInfo coerceAndExpandFPCCEligibleStruct(llvm::Type *Field1Ty,
-                                               CharUnits Field1Off,
-                                               llvm::Type *Field2Ty,
-                                               CharUnits Field2Off) const;
-
-  ABIArgInfo coerceVLSVector(QualType Ty) const;
-};
-} // end anonymous namespace
-
-void RISCVABIInfo::computeInfo(CGFunctionInfo &FI) const {
-  QualType RetTy = FI.getReturnType();
-  if (!getCXXABI().classifyReturnType(FI))
-    FI.getReturnInfo() = classifyReturnType(RetTy);
-
-  // IsRetIndirect is true if classifyArgumentType indicated the value should
-  // be passed indirect, or if the type size is a scalar greater than 2*XLen
-  // and not a complex type with elements <= FLen. e.g. fp128 is passed direct
-  // in LLVM IR, relying on the backend lowering code to rewrite the argument
-  // list and pass indirectly on RV32.
-  bool IsRetIndirect = FI.getReturnInfo().getKind() == ABIArgInfo::Indirect;
-  if (!IsRetIndirect && RetTy->isScalarType() &&
-      getContext().getTypeSize(RetTy) > (2 * XLen)) {
-    if (RetTy->isComplexType() && FLen) {
-      QualType EltTy = RetTy->castAs<ComplexType>()->getElementType();
-      IsRetIndirect = getContext().getTypeSize(EltTy) > FLen;
-    } else {
-      // This is a normal scalar > 2*XLen, such as fp128 on RV32.
-      IsRetIndirect = true;
-    }
-  }
-
-  int ArgGPRsLeft = IsRetIndirect ? NumArgGPRs - 1 : NumArgGPRs;
-  int ArgFPRsLeft = FLen ? NumArgFPRs : 0;
-  int NumFixedArgs = FI.getNumRequiredArgs();
-
-  int ArgNum = 0;
-  for (auto &ArgInfo : FI.arguments()) {
-    bool IsFixed = ArgNum < NumFixedArgs;
-    ArgInfo.info =
-        classifyArgumentType(ArgInfo.type, IsFixed, ArgGPRsLeft, ArgFPRsLeft);
-    ArgNum++;
-  }
-}
-
-// Returns true if the struct is a potential candidate for the floating point
-// calling convention. If this function returns true, the caller is
-// responsible for checking that if there is only a single field then that
-// field is a float.
-bool RISCVABIInfo::detectFPCCEligibleStructHelper(QualType Ty, CharUnits CurOff,
-                                                  llvm::Type *&Field1Ty,
-                                                  CharUnits &Field1Off,
-                                                  llvm::Type *&Field2Ty,
-                                                  CharUnits &Field2Off) const {
-  bool IsInt = Ty->isIntegralOrEnumerationType();
-  bool IsFloat = Ty->isRealFloatingType();
-
-  if (IsInt || IsFloat) {
-    uint64_t Size = getContext().getTypeSize(Ty);
-    if (IsInt && Size > XLen)
-      return false;
-    // Can't be eligible if larger than the FP registers. Handling of half
-    // precision values has been specified in the ABI, so don't block those.
-    if (IsFloat && Size > FLen)
-      return false;
-    // Can't be eligible if an integer type was already found (int+int pairs
-    // are not eligible).
-    if (IsInt && Field1Ty && Field1Ty->isIntegerTy())
-      return false;
-    if (!Field1Ty) {
-      Field1Ty = CGT.ConvertType(Ty);
-      Field1Off = CurOff;
-      return true;
-    }
-    if (!Field2Ty) {
-      Field2Ty = CGT.ConvertType(Ty);
-      Field2Off = CurOff;
-      return true;
-    }
-    return false;
-  }
-
-  if (auto CTy = Ty->getAs<ComplexType>()) {
-    if (Field1Ty)
-      return false;
-    QualType EltTy = CTy->getElementType();
-    if (getContext().getTypeSize(EltTy) > FLen)
-      return false;
-    Field1Ty = CGT.ConvertType(EltTy);
-    Field1Off = CurOff;
-    Field2Ty = Field1Ty;
-    Field2Off = Field1Off + getContext().getTypeSizeInChars(EltTy);
-    return true;
-  }
-
-  if (const ConstantArrayType *ATy = getContext().getAsConstantArrayType(Ty)) {
-    uint64_t ArraySize = ATy->getSize().getZExtValue();
-    QualType EltTy = ATy->getElementType();
-    CharUnits EltSize = getContext().getTypeSizeInChars(EltTy);
-    for (uint64_t i = 0; i < ArraySize; ++i) {
-      bool Ret = detectFPCCEligibleStructHelper(EltTy, CurOff, Field1Ty,
-                                                Field1Off, Field2Ty, Field2Off);
-      if (!Ret)
-        return false;
-      CurOff += EltSize;
-    }
-    return true;
-  }
-
-  if (const auto *RTy = Ty->getAs<RecordType>()) {
-    // Structures with either a non-trivial destructor or a non-trivial
-    // copy constructor are not eligible for the FP calling convention.
-    if (getRecordArgABI(Ty, CGT.getCXXABI()))
-      return false;
-    if (isEmptyRecord(getContext(), Ty, true))
-      return true;
-    const RecordDecl *RD = RTy->getDecl();
-    // Unions aren't eligible unless they're empty (which is caught above).
-    if (RD->isUnion())
-      return false;
-    const ASTRecordLayout &Layout = getContext().getASTRecordLayout(RD);
-    // If this is a C++ record, check the bases first.
-    if (const CXXRecordDecl *CXXRD = dyn_cast<CXXRecordDecl>(RD)) {
-      for (const CXXBaseSpecifier &B : CXXRD->bases()) {
-        const auto *BDecl =
-            cast<CXXRecordDecl>(B.getType()->castAs<RecordType>()->getDecl());
-        CharUnits BaseOff = Layout.getBaseClassOffset(BDecl);
-        bool Ret = detectFPCCEligibleStructHelper(B.getType(), CurOff + BaseOff,
-                                                  Field1Ty, Field1Off, Field2Ty,
-                                                  Field2Off);
-        if (!Ret)
-          return false;
-      }
-    }
-    int ZeroWidthBitFieldCount = 0;
-    for (const FieldDecl *FD : RD->fields()) {
-      uint64_t FieldOffInBits = Layout.getFieldOffset(FD->getFieldIndex());
-      QualType QTy = FD->getType();
-      if (FD->isBitField()) {
-        unsigned BitWidth = FD->getBitWidthValue(getContext());
-        // Allow a bitfield with a type greater than XLen as long as the
-        // bitwidth is XLen or less.
-        if (getContext().getTypeSize(QTy) > XLen && BitWidth <= XLen)
-          QTy = getContext().getIntTypeForBitwidth(XLen, false);
-        if (BitWidth == 0) {
-          ZeroWidthBitFieldCount++;
-          continue;
-        }
-      }
-
-      bool Ret = detectFPCCEligibleStructHelper(
-          QTy, CurOff + getContext().toCharUnitsFromBits(FieldOffInBits),
-          Field1Ty, Field1Off, Field2Ty, Field2Off);
-      if (!Ret)
-        return false;
-
-      // As a quirk of the ABI, zero-width bitfields aren't ignored for fp+fp
-      // or int+fp structs, but are ignored for a struct with an fp field and
-      // any number of zero-width bitfields.
-      if (Field2Ty && ZeroWidthBitFieldCount > 0)
-        return false;
-    }
-    return Field1Ty != nullptr;
-  }
-
-  return false;
-}
-
-// Determine if a struct is eligible for passing according to the floating
-// point calling convention (i.e., when flattened it contains a single fp
-// value, fp+fp, or int+fp of appropriate size). If so, NeededArgFPRs and
-// NeededArgGPRs are incremented appropriately.
-bool RISCVABIInfo::detectFPCCEligibleStruct(QualType Ty, llvm::Type *&Field1Ty,
-                                            CharUnits &Field1Off,
-                                            llvm::Type *&Field2Ty,
-                                            CharUnits &Field2Off,
-                                            int &NeededArgGPRs,
-                                            int &NeededArgFPRs) const {
-  Field1Ty = nullptr;
-  Field2Ty = nullptr;
-  NeededArgGPRs = 0;
-  NeededArgFPRs = 0;
-  bool IsCandidate = detectFPCCEligibleStructHelper(
-      Ty, CharUnits::Zero(), Field1Ty, Field1Off, Field2Ty, Field2Off);
-  // Not really a candidate if we have a single int but no float.
-  if (Field1Ty && !Field2Ty && !Field1Ty->isFloatingPointTy())
-    return false;
-  if (!IsCandidate)
-    return false;
-  if (Field1Ty && Field1Ty->isFloatingPointTy())
-    NeededArgFPRs++;
-  else if (Field1Ty)
-    NeededArgGPRs++;
-  if (Field2Ty && Field2Ty->isFloatingPointTy())
-    NeededArgFPRs++;
-  else if (Field2Ty)
-    NeededArgGPRs++;
-  return true;
-}
-
-// Call getCoerceAndExpand for the two-element flattened struct described by
-// Field1Ty, Field1Off, Field2Ty, Field2Off. This method will create an
-// appropriate coerceToType and unpaddedCoerceToType.
-ABIArgInfo RISCVABIInfo::coerceAndExpandFPCCEligibleStruct(
-    llvm::Type *Field1Ty, CharUnits Field1Off, llvm::Type *Field2Ty,
-    CharUnits Field2Off) const {
-  SmallVector<llvm::Type *, 3> CoerceElts;
-  SmallVector<llvm::Type *, 2> UnpaddedCoerceElts;
-  if (!Field1Off.isZero())
-    CoerceElts.push_back(llvm::ArrayType::get(
-        llvm::Type::getInt8Ty(getVMContext()), Field1Off.getQuantity()));
-
-  CoerceElts.push_back(Field1Ty);
-  UnpaddedCoerceElts.push_back(Field1Ty);
-
-  if (!Field2Ty) {
-    return ABIArgInfo::getCoerceAndExpand(
-        llvm::StructType::get(getVMContext(), CoerceElts, !Field1Off.isZero()),
-        UnpaddedCoerceElts[0]);
-  }
-
-  CharUnits Field2Align =
-      CharUnits::fromQuantity(getDataLayout().getABITypeAlign(Field2Ty));
-  CharUnits Field1End = Field1Off +
-      CharUnits::fromQuantity(getDataLayout().getTypeStoreSize(Field1Ty));
-  CharUnits Field2OffNoPadNoPack = Field1End.alignTo(Field2Align);
-
-  CharUnits Padding = CharUnits::Zero();
-  if (Field2Off > Field2OffNoPadNoPack)
-    Padding = Field2Off - Field2OffNoPadNoPack;
-  else if (Field2Off != Field2Align && Field2Off > Field1End)
-    Padding = Field2Off - Field1End;
-
-  bool IsPacked = !Field2Off.isMultipleOf(Field2Align);
-
-  if (!Padding.isZero())
-    CoerceElts.push_back(llvm::ArrayType::get(
-        llvm::Type::getInt8Ty(getVMContext()), Padding.getQuantity()));
-
-  CoerceElts.push_back(Field2Ty);
-  UnpaddedCoerceElts.push_back(Field2Ty);
-
-  auto CoerceToType =
-      llvm::StructType::get(getVMContext(), CoerceElts, IsPacked);
-  auto UnpaddedCoerceToType =
-      llvm::StructType::get(getVMContext(), UnpaddedCoerceElts, IsPacked);
-
-  return ABIArgInfo::getCoerceAndExpand(CoerceToType, UnpaddedCoerceToType);
-}
-
-// Fixed-length RVV vectors are represented as scalable vectors in function
-// args/return and must be coerced from fixed vectors.
-ABIArgInfo RISCVABIInfo::coerceVLSVector(QualType Ty) const {
-  assert(Ty->isVectorType() && "expected vector type!");
-
-  const auto *VT = Ty->castAs<VectorType>();
-  assert(VT->getVectorKind() == VectorType::RVVFixedLengthDataVector &&
-         "Unexpected vector kind");
-
-  assert(VT->getElementType()->isBuiltinType() && "expected builtin type!");
-
-  const auto *BT = VT->getElementType()->castAs<BuiltinType>();
-  unsigned EltSize = getContext().getTypeSize(BT);
-  llvm::ScalableVectorType *ResType =
-        llvm::ScalableVectorType::get(CGT.ConvertType(VT->getElementType()),
-                                      llvm::RISCV::RVVBitsPerBlock / EltSize);
-  return ABIArgInfo::getDirect(ResType);
-}
-
-ABIArgInfo RISCVABIInfo::classifyArgumentType(QualType Ty, bool IsFixed,
-                                              int &ArgGPRsLeft,
-                                              int &ArgFPRsLeft) const {
-  assert(ArgGPRsLeft <= NumArgGPRs && "Arg GPR tracking underflow");
-  Ty = useFirstFieldIfTransparentUnion(Ty);
-
-  // Structures with either a non-trivial destructor or a non-trivial
-  // copy constructor are always passed indirectly.
-  if (CGCXXABI::RecordArgABI RAA = getRecordArgABI(Ty, getCXXABI())) {
-    if (ArgGPRsLeft)
-      ArgGPRsLeft -= 1;
-    return getNaturalAlignIndirect(Ty, /*ByVal=*/RAA ==
-                                           CGCXXABI::RAA_DirectInMemory);
-  }
-
-  // Ignore empty structs/unions.
-  if (isEmptyRecord(getContext(), Ty, true))
-    return ABIArgInfo::getIgnore();
-
-  uint64_t Size = getContext().getTypeSize(Ty);
-
-  // Pass floating point values via FPRs if possible.
-  if (IsFixed && Ty->isFloatingType() && !Ty->isComplexType() &&
-      FLen >= Size && ArgFPRsLeft) {
-    ArgFPRsLeft--;
-    return ABIArgInfo::getDirect();
-  }
-
-  // Complex types for the hard float ABI must be passed direct rather than
-  // using CoerceAndExpand.
-  if (IsFixed && Ty->isComplexType() && FLen && ArgFPRsLeft >= 2) {
-    QualType EltTy = Ty->castAs<ComplexType>()->getElementType();
-    if (getContext().getTypeSize(EltTy) <= FLen) {
-      ArgFPRsLeft -= 2;
-      return ABIArgInfo::getDirect();
-    }
-  }
-
-  if (IsFixed && FLen && Ty->isStructureOrClassType()) {
-    llvm::Type *Field1Ty = nullptr;
-    llvm::Type *Field2Ty = nullptr;
-    CharUnits Field1Off = CharUnits::Zero();
-    CharUnits Field2Off = CharUnits::Zero();
-    int NeededArgGPRs = 0;
-    int NeededArgFPRs = 0;
-    bool IsCandidate =
-        detectFPCCEligibleStruct(Ty, Field1Ty, Field1Off, Field2Ty, Field2Off,
-                                 NeededArgGPRs, NeededArgFPRs);
-    if (IsCandidate && NeededArgGPRs <= ArgGPRsLeft &&
-        NeededArgFPRs <= ArgFPRsLeft) {
-      ArgGPRsLeft -= NeededArgGPRs;
-      ArgFPRsLeft -= NeededArgFPRs;
-      return coerceAndExpandFPCCEligibleStruct(Field1Ty, Field1Off, Field2Ty,
-                                               Field2Off);
-    }
-  }
-
-  uint64_t NeededAlign = getContext().getTypeAlign(Ty);
-  // Determine the number of GPRs needed to pass the current argument
-  // according to the ABI. 2*XLen-aligned varargs are passed in "aligned"
-  // register pairs, so may consume 3 registers.
-  int NeededArgGPRs = 1;
-  if (!IsFixed && NeededAlign == 2 * XLen)
-    NeededArgGPRs = 2 + (ArgGPRsLeft % 2);
-  else if (Size > XLen && Size <= 2 * XLen)
-    NeededArgGPRs = 2;
-
-  if (NeededArgGPRs > ArgGPRsLeft) {
-    NeededArgGPRs = ArgGPRsLeft;
-  }
-
-  ArgGPRsLeft -= NeededArgGPRs;
-
-  if (!isAggregateTypeForABI(Ty) && !Ty->isVectorType()) {
-    // Treat an enum type as its underlying type.
-    if (const EnumType *EnumTy = Ty->getAs<EnumType>())
-      Ty = EnumTy->getDecl()->getIntegerType();
-
-    // All integral types are promoted to XLen width
-    if (Size < XLen && Ty->isIntegralOrEnumerationType()) {
-      return extendType(Ty);
-    }
-
-    if (const auto *EIT = Ty->getAs<BitIntType>()) {
-      if (EIT->getNumBits() < XLen)
-        return extendType(Ty);
-      if (EIT->getNumBits() > 128 ||
-          (!getContext().getTargetInfo().hasInt128Type() &&
-           EIT->getNumBits() > 64))
-        return getNaturalAlignIndirect(Ty, /*ByVal=*/false);
-    }
-
-    return ABIArgInfo::getDirect();
-  }
-
-  if (const VectorType *VT = Ty->getAs<VectorType>())
-    if (VT->getVectorKind() == VectorType::RVVFixedLengthDataVector)
-      return coerceVLSVector(Ty);
-
-  // Aggregates which are <= 2*XLen will be passed in registers if possible,
-  // so coerce to integers.
-  if (Size <= 2 * XLen) {
-    unsigned Alignment = getContext().getTypeAlign(Ty);
-
-    // Use a single XLen int if possible, 2*XLen if 2*XLen alignment is
-    // required, and a 2-element XLen array if only XLen alignment is required.
-    if (Size <= XLen) {
-      return ABIArgInfo::getDirect(
-          llvm::IntegerType::get(getVMContext(), XLen));
-    } else if (Alignment == 2 * XLen) {
-      return ABIArgInfo::getDirect(
-          llvm::IntegerType::get(getVMContext(), 2 * XLen));
-    } else {
-      return ABIArgInfo::getDirect(llvm::ArrayType::get(
-          llvm::IntegerType::get(getVMContext(), XLen), 2));
-    }
-  }
-  return getNaturalAlignIndirect(Ty, /*ByVal=*/false);
-}
-
-ABIArgInfo RISCVABIInfo::classifyReturnType(QualType RetTy) const {
-  if (RetTy->isVoidType())
-    return ABIArgInfo::getIgnore();
-
-  int ArgGPRsLeft = 2;
-  int ArgFPRsLeft = FLen ? 2 : 0;
-
-  // The rules for return and argument types are the same, so defer to
-  // classifyArgumentType.
-  return classifyArgumentType(RetTy, /*IsFixed=*/true, ArgGPRsLeft,
-                              ArgFPRsLeft);
-}
-
-Address RISCVABIInfo::EmitVAArg(CodeGenFunction &CGF, Address VAListAddr,
-                                QualType Ty) const {
-  CharUnits SlotSize = CharUnits::fromQuantity(XLen / 8);
-
-  // Empty records are ignored for parameter passing purposes.
-  if (isEmptyRecord(getContext(), Ty, true)) {
-    Address Addr = Address(CGF.Builder.CreateLoad(VAListAddr),
-                           getVAListElementType(CGF), SlotSize);
-    Addr = CGF.Builder.CreateElementBitCast(Addr, CGF.ConvertTypeForMem(Ty));
-    return Addr;
-  }
-
-  auto TInfo = getContext().getTypeInfoInChars(Ty);
-
-  // Arguments bigger than 2*Xlen bytes are passed indirectly.
-  bool IsIndirect = TInfo.Width > 2 * SlotSize;
-
-  return emitVoidPtrVAArg(CGF, VAListAddr, Ty, IsIndirect, TInfo,
-                          SlotSize, /*AllowHigherAlign=*/true);
-}
-
-ABIArgInfo RISCVABIInfo::extendType(QualType Ty) const {
-  int TySize = getContext().getTypeSize(Ty);
-  // RV64 ABI requires unsigned 32 bit integers to be sign extended.
-  if (XLen == 64 && Ty->isUnsignedIntegerOrEnumerationType() && TySize == 32)
-    return ABIArgInfo::getSignExtend(Ty);
-  return ABIArgInfo::getExtend(Ty);
-}
-
-namespace {
-class RISCVTargetCodeGenInfo : public TargetCodeGenInfo {
-public:
-  RISCVTargetCodeGenInfo(CodeGen::CodeGenTypes &CGT, unsigned XLen,
-                         unsigned FLen)
-      : TargetCodeGenInfo(std::make_unique<RISCVABIInfo>(CGT, XLen, FLen)) {}
-
-  void setTargetAttributes(const Decl *D, llvm::GlobalValue *GV,
-                           CodeGen::CodeGenModule &CGM) const override {
-    const auto *FD = dyn_cast_or_null<FunctionDecl>(D);
-    if (!FD) return;
-
-    const auto *Attr = FD->getAttr<RISCVInterruptAttr>();
-    if (!Attr)
-      return;
-
-    const char *Kind;
-    switch (Attr->getInterrupt()) {
-    case RISCVInterruptAttr::supervisor: Kind = "supervisor"; break;
-    case RISCVInterruptAttr::machine: Kind = "machine"; break;
-    }
-
-    auto *Fn = cast<llvm::Function>(GV);
-
-    Fn->addFnAttr("interrupt", Kind);
-  }
-};
-} // namespace
-
-//===----------------------------------------------------------------------===//
-// VE ABI Implementation.
-//
-namespace {
-class VEABIInfo : public DefaultABIInfo {
-public:
-  VEABIInfo(CodeGenTypes &CGT) : DefaultABIInfo(CGT) {}
-
-private:
-  ABIArgInfo classifyReturnType(QualType RetTy) const;
-  ABIArgInfo classifyArgumentType(QualType RetTy) const;
-  void computeInfo(CGFunctionInfo &FI) const override;
-};
-} // end anonymous namespace
-
-ABIArgInfo VEABIInfo::classifyReturnType(QualType Ty) const {
-  if (Ty->isAnyComplexType())
-    return ABIArgInfo::getDirect();
-  uint64_t Size = getContext().getTypeSize(Ty);
-  if (Size < 64 && Ty->isIntegerType())
-    return ABIArgInfo::getExtend(Ty);
-  return DefaultABIInfo::classifyReturnType(Ty);
-}
-
-ABIArgInfo VEABIInfo::classifyArgumentType(QualType Ty) const {
-  if (Ty->isAnyComplexType())
-    return ABIArgInfo::getDirect();
-  uint64_t Size = getContext().getTypeSize(Ty);
-  if (Size < 64 && Ty->isIntegerType())
-    return ABIArgInfo::getExtend(Ty);
-  return DefaultABIInfo::classifyArgumentType(Ty);
-}
-
-void VEABIInfo::computeInfo(CGFunctionInfo &FI) const {
-  FI.getReturnInfo() = classifyReturnType(FI.getReturnType());
-  for (auto &Arg : FI.arguments())
-    Arg.info = classifyArgumentType(Arg.type);
-}
-
-namespace {
-class VETargetCodeGenInfo : public TargetCodeGenInfo {
-public:
-  VETargetCodeGenInfo(CodeGenTypes &CGT)
-      : TargetCodeGenInfo(std::make_unique<VEABIInfo>(CGT)) {}
-  // VE ABI requires the arguments of variadic and prototype-less functions
-  // are passed in both registers and memory.
-  bool isNoProtoCallVariadic(const CallArgList &args,
-                             const FunctionNoProtoType *fnType) const override {
-    return true;
-  }
-};
-} // end anonymous namespace
-
-//===----------------------------------------------------------------------===//
-// CSKY ABI Implementation
-//===----------------------------------------------------------------------===//
-namespace {
-class CSKYABIInfo : public DefaultABIInfo {
-  static const int NumArgGPRs = 4;
-  static const int NumArgFPRs = 4;
-
-  static const unsigned XLen = 32;
-  unsigned FLen;
-
-public:
-  CSKYABIInfo(CodeGen::CodeGenTypes &CGT, unsigned FLen)
-      : DefaultABIInfo(CGT), FLen(FLen) {}
-
-  void computeInfo(CGFunctionInfo &FI) const override;
-  ABIArgInfo classifyArgumentType(QualType Ty, int &ArgGPRsLeft,
-                                  int &ArgFPRsLeft,
-                                  bool isReturnType = false) const;
-  ABIArgInfo classifyReturnType(QualType RetTy) const;
-
-  Address EmitVAArg(CodeGenFunction &CGF, Address VAListAddr,
-                    QualType Ty) const override;
-};
-
-} // end anonymous namespace
-
-void CSKYABIInfo::computeInfo(CGFunctionInfo &FI) const {
-  QualType RetTy = FI.getReturnType();
-  if (!getCXXABI().classifyReturnType(FI))
-    FI.getReturnInfo() = classifyReturnType(RetTy);
-
-  bool IsRetIndirect = FI.getReturnInfo().getKind() == ABIArgInfo::Indirect;
-
-  // We must track the number of GPRs used in order to conform to the CSKY
-  // ABI, as integer scalars passed in registers should have signext/zeroext
-  // when promoted.
-  int ArgGPRsLeft = IsRetIndirect ? NumArgGPRs - 1 : NumArgGPRs;
-  int ArgFPRsLeft = FLen ? NumArgFPRs : 0;
-
-  for (auto &ArgInfo : FI.arguments()) {
-    ArgInfo.info = classifyArgumentType(ArgInfo.type, ArgGPRsLeft, ArgFPRsLeft);
-  }
-}
-
-Address CSKYABIInfo::EmitVAArg(CodeGenFunction &CGF, Address VAListAddr,
-                               QualType Ty) const {
-  CharUnits SlotSize = CharUnits::fromQuantity(XLen / 8);
-
-  // Empty records are ignored for parameter passing purposes.
-  if (isEmptyRecord(getContext(), Ty, true)) {
-    Address Addr = Address(CGF.Builder.CreateLoad(VAListAddr),
-                           getVAListElementType(CGF), SlotSize);
-    Addr = CGF.Builder.CreateElementBitCast(Addr, CGF.ConvertTypeForMem(Ty));
-    return Addr;
-  }
-
-  auto TInfo = getContext().getTypeInfoInChars(Ty);
-
-  return emitVoidPtrVAArg(CGF, VAListAddr, Ty, false, TInfo, SlotSize,
-                          /*AllowHigherAlign=*/true);
-}
-
-ABIArgInfo CSKYABIInfo::classifyArgumentType(QualType Ty, int &ArgGPRsLeft,
-                                             int &ArgFPRsLeft,
-                                             bool isReturnType) const {
-  assert(ArgGPRsLeft <= NumArgGPRs && "Arg GPR tracking underflow");
-  Ty = useFirstFieldIfTransparentUnion(Ty);
-
-  // Structures with either a non-trivial destructor or a non-trivial
-  // copy constructor are always passed indirectly.
-  if (CGCXXABI::RecordArgABI RAA = getRecordArgABI(Ty, getCXXABI())) {
-    if (ArgGPRsLeft)
-      ArgGPRsLeft -= 1;
-    return getNaturalAlignIndirect(Ty, /*ByVal=*/RAA ==
-                                           CGCXXABI::RAA_DirectInMemory);
-  }
-
-  // Ignore empty structs/unions.
-  if (isEmptyRecord(getContext(), Ty, true))
-    return ABIArgInfo::getIgnore();
-
-  if (!Ty->getAsUnionType())
-    if (const Type *SeltTy = isSingleElementStruct(Ty, getContext()))
-      return ABIArgInfo::getDirect(CGT.ConvertType(QualType(SeltTy, 0)));
-
-  uint64_t Size = getContext().getTypeSize(Ty);
-  // Pass floating point values via FPRs if possible.
-  if (Ty->isFloatingType() && !Ty->isComplexType() && FLen >= Size &&
-      ArgFPRsLeft) {
-    ArgFPRsLeft--;
-    return ABIArgInfo::getDirect();
-  }
-
-  // Complex types for the hard float ABI must be passed direct rather than
-  // using CoerceAndExpand.
-  if (Ty->isComplexType() && FLen && !isReturnType) {
-    QualType EltTy = Ty->castAs<ComplexType>()->getElementType();
-    if (getContext().getTypeSize(EltTy) <= FLen) {
-      ArgFPRsLeft -= 2;
-      return ABIArgInfo::getDirect();
-    }
-  }
-
-  if (!isAggregateTypeForABI(Ty)) {
-    // Treat an enum type as its underlying type.
-    if (const EnumType *EnumTy = Ty->getAs<EnumType>())
-      Ty = EnumTy->getDecl()->getIntegerType();
-
-    // All integral types are promoted to XLen width, unless passed on the
-    // stack.
-    if (Size < XLen && Ty->isIntegralOrEnumerationType())
-      return ABIArgInfo::getExtend(Ty);
-
-    if (const auto *EIT = Ty->getAs<BitIntType>()) {
-      if (EIT->getNumBits() < XLen)
-        return ABIArgInfo::getExtend(Ty);
-    }
-
-    return ABIArgInfo::getDirect();
-  }
-
-  // For argument type, the first 4*XLen parts of aggregate will be passed
-  // in registers, and the rest will be passed in stack.
-  // So we can coerce to integers directly and let backend handle it correctly.
-  // For return type, aggregate which <= 2*XLen will be returned in registers.
-  // Otherwise, aggregate will be returned indirectly.
-  if (!isReturnType || (isReturnType && Size <= 2 * XLen)) {
-    if (Size <= XLen) {
-      return ABIArgInfo::getDirect(
-          llvm::IntegerType::get(getVMContext(), XLen));
-    } else {
-      return ABIArgInfo::getDirect(llvm::ArrayType::get(
-          llvm::IntegerType::get(getVMContext(), XLen), (Size + 31) / XLen));
-    }
-  }
-  return getNaturalAlignIndirect(Ty, /*ByVal=*/false);
-}
-
-ABIArgInfo CSKYABIInfo::classifyReturnType(QualType RetTy) const {
-  if (RetTy->isVoidType())
-    return ABIArgInfo::getIgnore();
-
-  int ArgGPRsLeft = 2;
-  int ArgFPRsLeft = FLen ? 1 : 0;
-
-  // The rules for return and argument types are the same, so defer to
-  // classifyArgumentType.
-  return classifyArgumentType(RetTy, ArgGPRsLeft, ArgFPRsLeft, true);
-}
-
-namespace {
-class CSKYTargetCodeGenInfo : public TargetCodeGenInfo {
-public:
-  CSKYTargetCodeGenInfo(CodeGen::CodeGenTypes &CGT, unsigned FLen)
-      : TargetCodeGenInfo(std::make_unique<CSKYABIInfo>(CGT, FLen)) {}
-};
-} // end anonymous namespace
-
-//===----------------------------------------------------------------------===//
-// BPF ABI Implementation
-//===----------------------------------------------------------------------===//
-
-namespace {
-
-class BPFABIInfo : public DefaultABIInfo {
-public:
-  BPFABIInfo(CodeGenTypes &CGT) : DefaultABIInfo(CGT) {}
-
-  ABIArgInfo classifyArgumentType(QualType Ty) const {
-    Ty = useFirstFieldIfTransparentUnion(Ty);
-
-    if (isAggregateTypeForABI(Ty)) {
-      uint64_t Bits = getContext().getTypeSize(Ty);
-      if (Bits == 0)
-        return ABIArgInfo::getIgnore();
-
-      // If the aggregate needs 1 or 2 registers, do not use reference.
-      if (Bits <= 128) {
-        llvm::Type *CoerceTy;
-        if (Bits <= 64) {
-          CoerceTy =
-              llvm::IntegerType::get(getVMContext(), llvm::alignTo(Bits, 8));
-        } else {
-          llvm::Type *RegTy = llvm::IntegerType::get(getVMContext(), 64);
-          CoerceTy = llvm::ArrayType::get(RegTy, 2);
-        }
-        return ABIArgInfo::getDirect(CoerceTy);
-      } else {
-        return getNaturalAlignIndirect(Ty);
-      }
-    }
-
-    if (const EnumType *EnumTy = Ty->getAs<EnumType>())
-      Ty = EnumTy->getDecl()->getIntegerType();
-
-    ASTContext &Context = getContext();
-    if (const auto *EIT = Ty->getAs<BitIntType>())
-      if (EIT->getNumBits() > Context.getTypeSize(Context.Int128Ty))
-        return getNaturalAlignIndirect(Ty);
-
-    return (isPromotableIntegerTypeForABI(Ty) ? ABIArgInfo::getExtend(Ty)
-                                              : ABIArgInfo::getDirect());
-  }
-
-  ABIArgInfo classifyReturnType(QualType RetTy) const {
-    if (RetTy->isVoidType())
-      return ABIArgInfo::getIgnore();
-
-    if (isAggregateTypeForABI(RetTy))
-      return getNaturalAlignIndirect(RetTy);
-
-    // Treat an enum type as its underlying type.
-    if (const EnumType *EnumTy = RetTy->getAs<EnumType>())
-      RetTy = EnumTy->getDecl()->getIntegerType();
-
-    ASTContext &Context = getContext();
-    if (const auto *EIT = RetTy->getAs<BitIntType>())
-      if (EIT->getNumBits() > Context.getTypeSize(Context.Int128Ty))
-        return getNaturalAlignIndirect(RetTy);
-
-    // Caller will do necessary sign/zero extension.
-    return ABIArgInfo::getDirect();
-  }
-
-  void computeInfo(CGFunctionInfo &FI) const override {
-    FI.getReturnInfo() = classifyReturnType(FI.getReturnType());
-    for (auto &I : FI.arguments())
-      I.info = classifyArgumentType(I.type);
-  }
-
-};
-
-class BPFTargetCodeGenInfo : public TargetCodeGenInfo {
-public:
-  BPFTargetCodeGenInfo(CodeGenTypes &CGT)
-      : TargetCodeGenInfo(std::make_unique<BPFABIInfo>(CGT)) {}
-};
-
-}
-
-// LoongArch ABI Implementation. Documented at
-// https://loongson.github.io/LoongArch-Documentation/LoongArch-ELF-ABI-EN.html
-//
-//===----------------------------------------------------------------------===//
-
-namespace {
-class LoongArchABIInfo : public DefaultABIInfo {
-private:
-  // Size of the integer ('r') registers in bits.
-  unsigned GRLen;
-  // Size of the floating point ('f') registers in bits.
-  unsigned FRLen;
-  // Number of general-purpose argument registers.
-  static const int NumGARs = 8;
-  // Number of floating-point argument registers.
-  static const int NumFARs = 8;
-  bool detectFARsEligibleStructHelper(QualType Ty, CharUnits CurOff,
-                                      llvm::Type *&Field1Ty,
-                                      CharUnits &Field1Off,
-                                      llvm::Type *&Field2Ty,
-                                      CharUnits &Field2Off) const;
-
-public:
-  LoongArchABIInfo(CodeGen::CodeGenTypes &CGT, unsigned GRLen, unsigned FRLen)
-      : DefaultABIInfo(CGT), GRLen(GRLen), FRLen(FRLen) {}
-
-  void computeInfo(CGFunctionInfo &FI) const override;
-
-  ABIArgInfo classifyArgumentType(QualType Ty, bool IsFixed, int &GARsLeft,
-                                  int &FARsLeft) const;
-  ABIArgInfo classifyReturnType(QualType RetTy) const;
-
-  Address EmitVAArg(CodeGenFunction &CGF, Address VAListAddr,
-                    QualType Ty) const override;
-
-  ABIArgInfo extendType(QualType Ty) const;
-
-  bool detectFARsEligibleStruct(QualType Ty, llvm::Type *&Field1Ty,
-                                CharUnits &Field1Off, llvm::Type *&Field2Ty,
-                                CharUnits &Field2Off, int &NeededArgGPRs,
-                                int &NeededArgFPRs) const;
-  ABIArgInfo coerceAndExpandFARsEligibleStruct(llvm::Type *Field1Ty,
-                                               CharUnits Field1Off,
-                                               llvm::Type *Field2Ty,
-                                               CharUnits Field2Off) const;
-};
-} // end anonymous namespace
-
-void LoongArchABIInfo::computeInfo(CGFunctionInfo &FI) const {
-  QualType RetTy = FI.getReturnType();
-  if (!getCXXABI().classifyReturnType(FI))
-    FI.getReturnInfo() = classifyReturnType(RetTy);
-
-  // IsRetIndirect is true if classifyArgumentType indicated the value should
-  // be passed indirect, or if the type size is a scalar greater than 2*GRLen
-  // and not a complex type with elements <= FRLen. e.g. fp128 is passed direct
-  // in LLVM IR, relying on the backend lowering code to rewrite the argument
-  // list and pass indirectly on LA32.
-  bool IsRetIndirect = FI.getReturnInfo().getKind() == ABIArgInfo::Indirect;
-  if (!IsRetIndirect && RetTy->isScalarType() &&
-      getContext().getTypeSize(RetTy) > (2 * GRLen)) {
-    if (RetTy->isComplexType() && FRLen) {
-      QualType EltTy = RetTy->castAs<ComplexType>()->getElementType();
-      IsRetIndirect = getContext().getTypeSize(EltTy) > FRLen;
-    } else {
-      // This is a normal scalar > 2*GRLen, such as fp128 on LA32.
-      IsRetIndirect = true;
-    }
-  }
-
-  // We must track the number of GARs and FARs used in order to conform to the
-  // LoongArch ABI. As GAR usage is different for variadic arguments, we must
-  // also track whether we are examining a vararg or not.
-  int GARsLeft = IsRetIndirect ? NumGARs - 1 : NumGARs;
-  int FARsLeft = FRLen ? NumFARs : 0;
-  int NumFixedArgs = FI.getNumRequiredArgs();
-
-  int ArgNum = 0;
-  for (auto &ArgInfo : FI.arguments()) {
-    ArgInfo.info = classifyArgumentType(
-        ArgInfo.type, /*IsFixed=*/ArgNum < NumFixedArgs, GARsLeft, FARsLeft);
-    ArgNum++;
-  }
-}
-
-// Returns true if the struct is a potential candidate to be passed in FARs (and
-// GARs). If this function returns true, the caller is responsible for checking
-// that if there is only a single field then that field is a float.
-bool LoongArchABIInfo::detectFARsEligibleStructHelper(
-    QualType Ty, CharUnits CurOff, llvm::Type *&Field1Ty, CharUnits &Field1Off,
-    llvm::Type *&Field2Ty, CharUnits &Field2Off) const {
-  bool IsInt = Ty->isIntegralOrEnumerationType();
-  bool IsFloat = Ty->isRealFloatingType();
-
-  if (IsInt || IsFloat) {
-    uint64_t Size = getContext().getTypeSize(Ty);
-    if (IsInt && Size > GRLen)
-      return false;
-    // Can't be eligible if larger than the FP registers. Half precision isn't
-    // currently supported on LoongArch and the ABI hasn't been confirmed, so
-    // default to the integer ABI in that case.
-    if (IsFloat && (Size > FRLen || Size < 32))
-      return false;
-    // Can't be eligible if an integer type was already found (int+int pairs
-    // are not eligible).
-    if (IsInt && Field1Ty && Field1Ty->isIntegerTy())
-      return false;
-    if (!Field1Ty) {
-      Field1Ty = CGT.ConvertType(Ty);
-      Field1Off = CurOff;
-      return true;
-    }
-    if (!Field2Ty) {
-      Field2Ty = CGT.ConvertType(Ty);
-      Field2Off = CurOff;
-      return true;
-    }
-    return false;
-  }
-
-  if (auto CTy = Ty->getAs<ComplexType>()) {
-    if (Field1Ty)
-      return false;
-    QualType EltTy = CTy->getElementType();
-    if (getContext().getTypeSize(EltTy) > FRLen)
-      return false;
-    Field1Ty = CGT.ConvertType(EltTy);
-    Field1Off = CurOff;
-    Field2Ty = Field1Ty;
-    Field2Off = Field1Off + getContext().getTypeSizeInChars(EltTy);
-    return true;
-  }
-
-  if (const ConstantArrayType *ATy = getContext().getAsConstantArrayType(Ty)) {
-    uint64_t ArraySize = ATy->getSize().getZExtValue();
-    QualType EltTy = ATy->getElementType();
-    CharUnits EltSize = getContext().getTypeSizeInChars(EltTy);
-    for (uint64_t i = 0; i < ArraySize; ++i) {
-      if (!detectFARsEligibleStructHelper(EltTy, CurOff, Field1Ty, Field1Off,
-                                          Field2Ty, Field2Off))
-        return false;
-      CurOff += EltSize;
-    }
-    return true;
-  }
-
-  if (const auto *RTy = Ty->getAs<RecordType>()) {
-    // Structures with either a non-trivial destructor or a non-trivial
-    // copy constructor are not eligible for the FP calling convention.
-    if (getRecordArgABI(Ty, CGT.getCXXABI()))
-      return false;
-    if (isEmptyRecord(getContext(), Ty, true))
-      return true;
-    const RecordDecl *RD = RTy->getDecl();
-    // Unions aren't eligible unless they're empty (which is caught above).
-    if (RD->isUnion())
-      return false;
-    const ASTRecordLayout &Layout = getContext().getASTRecordLayout(RD);
-    // If this is a C++ record, check the bases first.
-    if (const CXXRecordDecl *CXXRD = dyn_cast<CXXRecordDecl>(RD)) {
-      for (const CXXBaseSpecifier &B : CXXRD->bases()) {
-        const auto *BDecl =
-            cast<CXXRecordDecl>(B.getType()->castAs<RecordType>()->getDecl());
-        if (!detectFARsEligibleStructHelper(
-                B.getType(), CurOff + Layout.getBaseClassOffset(BDecl),
-                Field1Ty, Field1Off, Field2Ty, Field2Off))
-          return false;
-      }
-    }
-    for (const FieldDecl *FD : RD->fields()) {
-      QualType QTy = FD->getType();
-      if (FD->isBitField()) {
-        unsigned BitWidth = FD->getBitWidthValue(getContext());
-        // Zero-width bitfields are ignored.
-        if (BitWidth == 0)
-          continue;
-        // Allow a bitfield with a type greater than GRLen as long as the
-        // bitwidth is GRLen or less.
-        if (getContext().getTypeSize(QTy) > GRLen && BitWidth <= GRLen) {
-          QTy = getContext().getIntTypeForBitwidth(GRLen, false);
-        }
-      }
-
-      if (!detectFARsEligibleStructHelper(
-              QTy,
-              CurOff + getContext().toCharUnitsFromBits(
-                           Layout.getFieldOffset(FD->getFieldIndex())),
-              Field1Ty, Field1Off, Field2Ty, Field2Off))
-        return false;
-    }
-    return Field1Ty != nullptr;
-  }
-
-  return false;
-}
-
-// Determine if a struct is eligible to be passed in FARs (and GARs) (i.e., when
-// flattened it contains a single fp value, fp+fp, or int+fp of appropriate
-// size). If so, NeededFARs and NeededGARs are incremented appropriately.
-bool LoongArchABIInfo::detectFARsEligibleStruct(
-    QualType Ty, llvm::Type *&Field1Ty, CharUnits &Field1Off,
-    llvm::Type *&Field2Ty, CharUnits &Field2Off, int &NeededGARs,
-    int &NeededFARs) const {
-  Field1Ty = nullptr;
-  Field2Ty = nullptr;
-  NeededGARs = 0;
-  NeededFARs = 0;
-  if (!detectFARsEligibleStructHelper(Ty, CharUnits::Zero(), Field1Ty,
-                                      Field1Off, Field2Ty, Field2Off))
-    return false;
-  // Not really a candidate if we have a single int but no float.
-  if (Field1Ty && !Field2Ty && !Field1Ty->isFloatingPointTy())
-    return false;
-  if (Field1Ty && Field1Ty->isFloatingPointTy())
-    NeededFARs++;
-  else if (Field1Ty)
-    NeededGARs++;
-  if (Field2Ty && Field2Ty->isFloatingPointTy())
-    NeededFARs++;
-  else if (Field2Ty)
-    NeededGARs++;
-  return true;
-}
-
-// Call getCoerceAndExpand for the two-element flattened struct described by
-// Field1Ty, Field1Off, Field2Ty, Field2Off. This method will create an
-// appropriate coerceToType and unpaddedCoerceToType.
-ABIArgInfo LoongArchABIInfo::coerceAndExpandFARsEligibleStruct(
-    llvm::Type *Field1Ty, CharUnits Field1Off, llvm::Type *Field2Ty,
-    CharUnits Field2Off) const {
-  SmallVector<llvm::Type *, 3> CoerceElts;
-  SmallVector<llvm::Type *, 2> UnpaddedCoerceElts;
-  if (!Field1Off.isZero())
-    CoerceElts.push_back(llvm::ArrayType::get(
-        llvm::Type::getInt8Ty(getVMContext()), Field1Off.getQuantity()));
-
-  CoerceElts.push_back(Field1Ty);
-  UnpaddedCoerceElts.push_back(Field1Ty);
-
-  if (!Field2Ty) {
-    return ABIArgInfo::getCoerceAndExpand(
-        llvm::StructType::get(getVMContext(), CoerceElts, !Field1Off.isZero()),
-        UnpaddedCoerceElts[0]);
-  }
-
-  CharUnits Field2Align =
-      CharUnits::fromQuantity(getDataLayout().getABITypeAlign(Field2Ty));
-  CharUnits Field1End =
-      Field1Off +
-      CharUnits::fromQuantity(getDataLayout().getTypeStoreSize(Field1Ty));
-  CharUnits Field2OffNoPadNoPack = Field1End.alignTo(Field2Align);
-
-  CharUnits Padding = CharUnits::Zero();
-  if (Field2Off > Field2OffNoPadNoPack)
-    Padding = Field2Off - Field2OffNoPadNoPack;
-  else if (Field2Off != Field2Align && Field2Off > Field1End)
-    Padding = Field2Off - Field1End;
-
-  bool IsPacked = !Field2Off.isMultipleOf(Field2Align);
-
-  if (!Padding.isZero())
-    CoerceElts.push_back(llvm::ArrayType::get(
-        llvm::Type::getInt8Ty(getVMContext()), Padding.getQuantity()));
-
-  CoerceElts.push_back(Field2Ty);
-  UnpaddedCoerceElts.push_back(Field2Ty);
-
-  return ABIArgInfo::getCoerceAndExpand(
-      llvm::StructType::get(getVMContext(), CoerceElts, IsPacked),
-      llvm::StructType::get(getVMContext(), UnpaddedCoerceElts, IsPacked));
-}
-
-ABIArgInfo LoongArchABIInfo::classifyArgumentType(QualType Ty, bool IsFixed,
-                                                  int &GARsLeft,
-                                                  int &FARsLeft) const {
-  assert(GARsLeft <= NumGARs && "GAR tracking underflow");
-  Ty = useFirstFieldIfTransparentUnion(Ty);
-
-  // Structures with either a non-trivial destructor or a non-trivial
-  // copy constructor are always passed indirectly.
-  if (CGCXXABI::RecordArgABI RAA = getRecordArgABI(Ty, getCXXABI())) {
-    if (GARsLeft)
-      GARsLeft -= 1;
-    return getNaturalAlignIndirect(Ty, /*ByVal=*/RAA ==
-                                           CGCXXABI::RAA_DirectInMemory);
-  }
-
-  // Ignore empty structs/unions.
-  if (isEmptyRecord(getContext(), Ty, true))
-    return ABIArgInfo::getIgnore();
-
-  uint64_t Size = getContext().getTypeSize(Ty);
-
-  // Pass floating point values via FARs if possible.
-  if (IsFixed && Ty->isFloatingType() && !Ty->isComplexType() &&
-      FRLen >= Size && FARsLeft) {
-    FARsLeft--;
-    return ABIArgInfo::getDirect();
-  }
-
-  // Complex types for the *f or *d ABI must be passed directly rather than
-  // using CoerceAndExpand.
-  if (IsFixed && Ty->isComplexType() && FRLen && FARsLeft >= 2) {
-    QualType EltTy = Ty->castAs<ComplexType>()->getElementType();
-    if (getContext().getTypeSize(EltTy) <= FRLen) {
-      FARsLeft -= 2;
-      return ABIArgInfo::getDirect();
-    }
-  }
-
-  if (IsFixed && FRLen && Ty->isStructureOrClassType()) {
-    llvm::Type *Field1Ty = nullptr;
-    llvm::Type *Field2Ty = nullptr;
-    CharUnits Field1Off = CharUnits::Zero();
-    CharUnits Field2Off = CharUnits::Zero();
-    int NeededGARs = 0;
-    int NeededFARs = 0;
-    bool IsCandidate = detectFARsEligibleStruct(
-        Ty, Field1Ty, Field1Off, Field2Ty, Field2Off, NeededGARs, NeededFARs);
-    if (IsCandidate && NeededGARs <= GARsLeft && NeededFARs <= FARsLeft) {
-      GARsLeft -= NeededGARs;
-      FARsLeft -= NeededFARs;
-      return coerceAndExpandFARsEligibleStruct(Field1Ty, Field1Off, Field2Ty,
-                                               Field2Off);
-    }
-  }
-
-  uint64_t NeededAlign = getContext().getTypeAlign(Ty);
-  // Determine the number of GARs needed to pass the current argument
-  // according to the ABI. 2*GRLen-aligned varargs are passed in "aligned"
-  // register pairs, so may consume 3 registers.
-  int NeededGARs = 1;
-  if (!IsFixed && NeededAlign == 2 * GRLen)
-    NeededGARs = 2 + (GARsLeft % 2);
-  else if (Size > GRLen && Size <= 2 * GRLen)
-    NeededGARs = 2;
-
-  if (NeededGARs > GARsLeft)
-    NeededGARs = GARsLeft;
-
-  GARsLeft -= NeededGARs;
-
-  if (!isAggregateTypeForABI(Ty) && !Ty->isVectorType()) {
-    // Treat an enum type as its underlying type.
-    if (const EnumType *EnumTy = Ty->getAs<EnumType>())
-      Ty = EnumTy->getDecl()->getIntegerType();
-
-    // All integral types are promoted to GRLen width.
-    if (Size < GRLen && Ty->isIntegralOrEnumerationType())
-      return extendType(Ty);
-
-    if (const auto *EIT = Ty->getAs<BitIntType>()) {
-      if (EIT->getNumBits() < GRLen)
-        return extendType(Ty);
-      if (EIT->getNumBits() > 128 ||
-          (!getContext().getTargetInfo().hasInt128Type() &&
-           EIT->getNumBits() > 64))
-        return getNaturalAlignIndirect(Ty, /*ByVal=*/false);
-    }
-
-    return ABIArgInfo::getDirect();
-  }
-
-  // Aggregates which are <= 2*GRLen will be passed in registers if possible,
-  // so coerce to integers.
-  if (Size <= 2 * GRLen) {
-    // Use a single GRLen int if possible, 2*GRLen if 2*GRLen alignment is
-    // required, and a 2-element GRLen array if only GRLen alignment is
-    // required.
-    if (Size <= GRLen) {
-      return ABIArgInfo::getDirect(
-          llvm::IntegerType::get(getVMContext(), GRLen));
-    }
-    if (getContext().getTypeAlign(Ty) == 2 * GRLen) {
-      return ABIArgInfo::getDirect(
-          llvm::IntegerType::get(getVMContext(), 2 * GRLen));
-    }
-    return ABIArgInfo::getDirect(
-        llvm::ArrayType::get(llvm::IntegerType::get(getVMContext(), GRLen), 2));
-  }
-  return getNaturalAlignIndirect(Ty, /*ByVal=*/false);
-}
-
-ABIArgInfo LoongArchABIInfo::classifyReturnType(QualType RetTy) const {
-  if (RetTy->isVoidType())
-    return ABIArgInfo::getIgnore();
-  // The rules for return and argument types are the same, so defer to
-  // classifyArgumentType.
-  int GARsLeft = 2;
-  int FARsLeft = FRLen ? 2 : 0;
-  return classifyArgumentType(RetTy, /*IsFixed=*/true, GARsLeft, FARsLeft);
-}
-
-Address LoongArchABIInfo::EmitVAArg(CodeGenFunction &CGF, Address VAListAddr,
-                                    QualType Ty) const {
-  CharUnits SlotSize = CharUnits::fromQuantity(GRLen / 8);
-
-  // Empty records are ignored for parameter passing purposes.
-  if (isEmptyRecord(getContext(), Ty, true)) {
-    Address Addr = Address(CGF.Builder.CreateLoad(VAListAddr),
-                           getVAListElementType(CGF), SlotSize);
-    Addr = CGF.Builder.CreateElementBitCast(Addr, CGF.ConvertTypeForMem(Ty));
-    return Addr;
-  }
-
-  auto TInfo = getContext().getTypeInfoInChars(Ty);
-
-  // Arguments bigger than 2*GRLen bytes are passed indirectly.
-  return emitVoidPtrVAArg(CGF, VAListAddr, Ty,
-                          /*IsIndirect=*/TInfo.Width > 2 * SlotSize, TInfo,
-                          SlotSize,
-                          /*AllowHigherAlign=*/true);
-}
-
-ABIArgInfo LoongArchABIInfo::extendType(QualType Ty) const {
-  int TySize = getContext().getTypeSize(Ty);
-  // LA64 ABI requires unsigned 32 bit integers to be sign extended.
-  if (GRLen == 64 && Ty->isUnsignedIntegerOrEnumerationType() && TySize == 32)
-    return ABIArgInfo::getSignExtend(Ty);
-  return ABIArgInfo::getExtend(Ty);
-}
-
-namespace {
-class LoongArchTargetCodeGenInfo : public TargetCodeGenInfo {
-public:
-  LoongArchTargetCodeGenInfo(CodeGen::CodeGenTypes &CGT, unsigned GRLen,
-                             unsigned FRLen)
-      : TargetCodeGenInfo(
-            std::make_unique<LoongArchABIInfo>(CGT, GRLen, FRLen)) {}
-};
 } // namespace
 
 //===----------------------------------------------------------------------===//
 // Driver code
 //===----------------------------------------------------------------------===//
 
 bool CodeGenModule::supportsCOMDAT() const {
   return getTriple().supportsCOMDAT();
llvm::Value *TargetCodeGenInfo::createEnqueuedBlockKernel(
   llvm::SmallVector<llvm::Value *, 2> Args(llvm::make_pointer_range(F->args()));
   llvm::CallInst *Call = Builder.CreateCall(Invoke, Args);
   Call->setCallingConv(Invoke->getCallingConv());
 
   Builder.CreateRetVoid();
   Builder.restoreIP(IP);
   return F;
 }
-
-/// Create an OpenCL kernel for an enqueued block.
-///
-/// The type of the first argument (the block literal) is the struct type
-/// of the block literal instead of a pointer type. The first argument
-/// (block literal) is passed directly by value to the kernel. The kernel
-/// allocates the same type of struct on stack and stores the block literal
-/// to it and passes its pointer to the block invoke function. The kernel
-/// has "enqueued-block" function attribute and kernel argument metadata.
-llvm::Value *AMDGPUTargetCodeGenInfo::createEnqueuedBlockKernel(
-    CodeGenFunction &CGF, llvm::Function *Invoke, llvm::Type *BlockTy) const {
-  auto &Builder = CGF.Builder;
-  auto &C = CGF.getLLVMContext();
-
-  auto *InvokeFT = Invoke->getFunctionType();
-  llvm::SmallVector<llvm::Type *, 2> ArgTys;
-  llvm::SmallVector<llvm::Metadata *, 8> AddressQuals;
-  llvm::SmallVector<llvm::Metadata *, 8> AccessQuals;
-  llvm::SmallVector<llvm::Metadata *, 8> ArgTypeNames;
-  llvm::SmallVector<llvm::Metadata *, 8> ArgBaseTypeNames;
-  llvm::SmallVector<llvm::Metadata *, 8> ArgTypeQuals;
-  llvm::SmallVector<llvm::Metadata *, 8> ArgNames;
-
-  ArgTys.push_back(BlockTy);
-  ArgTypeNames.push_back(llvm::MDString::get(C, "__block_literal"));
-  AddressQuals.push_back(llvm::ConstantAsMetadata::get(Builder.getInt32(0)));
-  ArgBaseTypeNames.push_back(llvm::MDString::get(C, "__block_literal"));
-  ArgTypeQuals.push_back(llvm::MDString::get(C, ""));
-  AccessQuals.push_back(llvm::MDString::get(C, "none"));
-  ArgNames.push_back(llvm::MDString::get(C, "block_literal"));
-  for (unsigned I = 1, E = InvokeFT->getNumParams(); I < E; ++I) {
-    ArgTys.push_back(InvokeFT->getParamType(I));
-    ArgTypeNames.push_back(llvm::MDString::get(C, "void*"));
-    AddressQuals.push_back(llvm::ConstantAsMetadata::get(Builder.getInt32(3)));
-    AccessQuals.push_back(llvm::MDString::get(C, "none"));
-    ArgBaseTypeNames.push_back(llvm::MDString::get(C, "void*"));
-    ArgTypeQuals.push_back(llvm::MDString::get(C, ""));
-    ArgNames.push_back(
-        llvm::MDString::get(C, (Twine("local_arg") + Twine(I)).str()));
-  }
-  std::string Name = Invoke->getName().str() + "_kernel";
-  auto *FT = llvm::FunctionType::get(llvm::Type::getVoidTy(C), ArgTys, false);
-  auto *F = llvm::Function::Create(FT, llvm::GlobalValue::InternalLinkage, Name,
-                                   &CGF.CGM.getModule());
-  F->setCallingConv(llvm::CallingConv::AMDGPU_KERNEL);
-
-  llvm::AttrBuilder KernelAttrs(C);
-  // FIXME: The invoke isn't applying the right attributes either
-  // FIXME: This is missing setTargetAttributes
-  CGF.CGM.addDefaultFunctionDefinitionAttributes(KernelAttrs);
-  KernelAttrs.addAttribute("enqueued-block");
-  F->addFnAttrs(KernelAttrs);
-
-  auto IP = CGF.Builder.saveIP();
-  auto *BB = llvm::BasicBlock::Create(C, "entry", F);
-  Builder.SetInsertPoint(BB);
-  const auto BlockAlign = CGF.CGM.getDataLayout().getPrefTypeAlign(BlockTy);
-  auto *BlockPtr = Builder.CreateAlloca(BlockTy, nullptr);
-  BlockPtr->setAlignment(BlockAlign);
-  Builder.CreateAlignedStore(F->arg_begin(), BlockPtr, BlockAlign);
-  auto *Cast = Builder.CreatePointerCast(BlockPtr, InvokeFT->getParamType(0));
-  llvm::SmallVector<llvm::Value *, 2> Args;
-  Args.push_back(Cast);
-  for (llvm::Argument &A : llvm::drop_begin(F->args()))
-    Args.push_back(&A);
-  llvm::CallInst *call = Builder.CreateCall(Invoke, Args);
-  call->setCallingConv(Invoke->getCallingConv());
-  Builder.CreateRetVoid();
-  Builder.restoreIP(IP);
-
-  F->setMetadata("kernel_arg_addr_space", llvm::MDNode::get(C, AddressQuals));
-  F->setMetadata("kernel_arg_access_qual", llvm::MDNode::get(C, AccessQuals));
-  F->setMetadata("kernel_arg_type", llvm::MDNode::get(C, ArgTypeNames));
-  F->setMetadata("kernel_arg_base_type",
-                 llvm::MDNode::get(C, ArgBaseTypeNames));
-  F->setMetadata("kernel_arg_type_qual", llvm::MDNode::get(C, ArgTypeQuals));
-  if (CGF.CGM.getCodeGenOpts().EmitOpenCLArgMetadata)
-    F->setMetadata("kernel_arg_name", llvm::MDNode::get(C, ArgNames));
-
-  return F;
-}

clang/lib/CodeGen/Targets/AArch64.h

+//===- AArch64.h ------------------------------------------------*- C++ -*-===//
+//
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
+//
+//===----------------------------------------------------------------------===//
+
+#ifndef LLVM_CLANG_LIB_CODEGEN_TARGETS_AARCH64_H
+#define LLVM_CLANG_LIB_CODEGEN_TARGETS_AARCH64_H
+
+#include "TargetInfo.h"
+
+namespace clang::CodeGen {
+
+enum class AArch64ABIKind {
+  AAPCS = 0,
+  DarwinPCS,
+  Win64,
+};
+
+class LLVM_LIBRARY_VISIBILITY AArch64TargetCodeGenInfo
+    : public TargetCodeGenInfo {
+public:
+  AArch64TargetCodeGenInfo(CodeGenTypes &CGT, AArch64ABIKind Kind);
+
+  StringRef getARCRetainAutoreleasedReturnValueMarker() const override {
+    return "mov\tfp, fp\t\t// marker for objc_retainAutoreleaseReturnValue";
+  }
+
+  int getDwarfEHStackPointer(CodeGen::CodeGenModule &M) const override {
+    return 31;
+  }
+
+  bool doesReturnSlotInterfereWithArgs() const override { return false; }
+
+  void setTargetAttributes(const Decl *D, llvm::GlobalValue *GV,
+                           CodeGen::CodeGenModule &CGM) const override;
+
+  bool isScalarizableAsmOperand(CodeGen::CodeGenFunction &CGF,
+                                llvm::Type *Ty) const override;
+};
+
+class LLVM_LIBRARY_VISIBILITY WindowsAArch64TargetCodeGenInfo
+    : public AArch64TargetCodeGenInfo {
+public:
+  WindowsAArch64TargetCodeGenInfo(CodeGenTypes &CGT, AArch64ABIKind K)
+      : AArch64TargetCodeGenInfo(CGT, K) {}
+
+  void setTargetAttributes(const Decl *D, llvm::GlobalValue *GV,
+                           CodeGen::CodeGenModule &CGM) const override;
+
+  void getDependentLibraryOption(llvm::StringRef Lib,
+                                 llvm::SmallString<24> &Opt) const override;
+
+  void getDetectMismatchOption(llvm::StringRef Name, llvm::StringRef Value,
+                               llvm::SmallString<32> &Opt) const override {
+    Opt = "/FAILIFMISMATCH:\"" + Name.str() + "=" + Value.str() + "\"";
+  }
+};
+
+} // namespace clang::CodeGen
+
+#endif // LLVM_CLANG_LIB_CODEGEN_TARGETS_AARCH64_H

clang/lib/CodeGen/Targets/AArch64.cpp

+//===- AArch64.cpp --------------------------------------------------------===//
+//
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
+//
+//===----------------------------------------------------------------------===//
+
+#include "AArch64.h"
+#include "ABIInfoImpl.h"
+
+using namespace clang;
+using namespace clang::CodeGen;
+
+//===----------------------------------------------------------------------===//
+// AArch64 ABI Implementation
+//===----------------------------------------------------------------------===//
+
+namespace {
+
+class AArch64ABIInfo : public ABIInfo {
+  AArch64ABIKind Kind;
+
+public:
+  AArch64ABIInfo(CodeGenTypes &CGT, AArch64ABIKind Kind)
+      : ABIInfo(CGT), Kind(Kind) {}
+
+private:
+  AArch64ABIKind getABIKind() const { return Kind; }
+  bool isDarwinPCS() const { return Kind == AArch64ABIKind::DarwinPCS; }
+
+  ABIArgInfo classifyReturnType(QualType RetTy, bool IsVariadic) const;
+  ABIArgInfo classifyArgumentType(QualType RetTy, bool IsVariadic,
+                                  unsigned CallingConvention) const;
+  ABIArgInfo coerceIllegalVector(QualType Ty) const;
+  bool isHomogeneousAggregateBaseType(QualType Ty) const override;
+  bool isHomogeneousAggregateSmallEnough(const Type *Ty,
+                                         uint64_t Members) const override;
+  bool isZeroLengthBitfieldPermittedInHomogeneousAggregate() const override;
+
+  bool isIllegalVectorType(QualType Ty) const;
+
+  void computeInfo(CGFunctionInfo &FI) const override {
+    if (!::classifyReturnType(getCXXABI(), FI, *this))
+      FI.getReturnInfo() =
+          classifyReturnType(FI.getReturnType(), FI.isVariadic());
+
+    for (auto &it : FI.arguments())
+      it.info = classifyArgumentType(it.type, FI.isVariadic(),
+                                     FI.getCallingConvention());
+  }
+
+  Address EmitDarwinVAArg(Address VAListAddr, QualType Ty,
+                          CodeGenFunction &CGF) const;
+
+  Address EmitAAPCSVAArg(Address VAListAddr, QualType Ty,
+                         CodeGenFunction &CGF) const;
+
+  Address EmitVAArg(CodeGenFunction &CGF, Address VAListAddr,
+                    QualType Ty) const override {
+    llvm::Type *BaseTy = CGF.ConvertType(Ty);
+    if (isa<llvm::ScalableVectorType>(BaseTy))
+      llvm::report_fatal_error("Passing SVE types to variadic functions is "
+                               "currently not supported");
+
+    return Kind == AArch64ABIKind::Win64 ? EmitMSVAArg(CGF, VAListAddr, Ty)
+           : isDarwinPCS()               ? EmitDarwinVAArg(VAListAddr, Ty, CGF)
+                                         : EmitAAPCSVAArg(VAListAddr, Ty, CGF);
+  }
+
+  Address EmitMSVAArg(CodeGenFunction &CGF, Address VAListAddr,
+                      QualType Ty) const override;
+
+  bool allowBFloatArgsAndRet() const override {
+    return getTarget().hasBFloat16Type();
+  }
+};
+
+class AArch64SwiftABIInfo : public SwiftABIInfo {
+public:
+  explicit AArch64SwiftABIInfo(CodeGenTypes &CGT)
+      : SwiftABIInfo(CGT, /*SwiftErrorInRegister=*/true) {}
+
+  bool isLegalVectorType(CharUnits VectorSize, llvm::Type *EltTy,
+                         unsigned NumElts) const override;
+};
+
+} // namespace
+
+AArch64TargetCodeGenInfo::AArch64TargetCodeGenInfo(CodeGenTypes &CGT,
+                                                   AArch64ABIKind Kind)
+    : TargetCodeGenInfo(std::make_unique<AArch64ABIInfo>(CGT, Kind)) {
+  SwiftInfo = std::make_unique<AArch64SwiftABIInfo>(CGT);
+}
+
+void AArch64TargetCodeGenInfo::setTargetAttributes(const Decl *D,
+                                                   llvm::GlobalValue *GV,
+                                                   CodeGenModule &CGM) const {
+  const FunctionDecl *FD = dyn_cast_or_null<FunctionDecl>(D);
+  if (!FD)
+    return;
+
+  const auto *TA = FD->getAttr<TargetAttr>();
+  if (TA == nullptr)
+    return;
+
+  ParsedTargetAttr Attr = CGM.getTarget().parseTargetAttr(TA->getFeaturesStr());
+  if (Attr.BranchProtection.empty())
+    return;
+
+  TargetInfo::BranchProtectionInfo BPI;
+  StringRef Error;
+  (void)CGM.getTarget().validateBranchProtection(Attr.BranchProtection,
+                                                 Attr.CPU, BPI, Error);
+  assert(Error.empty());
+
+  auto *Fn = cast<llvm::Function>(GV);
+  static const char *SignReturnAddrStr[] = {"none", "non-leaf", "all"};
+  Fn->addFnAttr("sign-return-address",
+                SignReturnAddrStr[static_cast<int>(BPI.SignReturnAddr)]);
+
+  if (BPI.SignReturnAddr != LangOptions::SignReturnAddressScopeKind::None) {
+    Fn->addFnAttr("sign-return-address-key",
+                  BPI.SignKey == LangOptions::SignReturnAddressKeyKind::AKey
+                      ? "a_key"
+                      : "b_key");
+  }
+
+  Fn->addFnAttr("branch-target-enforcement",
+                BPI.BranchTargetEnforcement ? "true" : "false");
+}
+
+bool AArch64TargetCodeGenInfo::isScalarizableAsmOperand(CodeGenFunction &CGF,
+                                                        llvm::Type *Ty) const {
+  if (CGF.getTarget().hasFeature("ls64")) {
+    auto *ST = dyn_cast<llvm::StructType>(Ty);
+    if (ST && ST->getNumElements() == 1) {
+      auto *AT = dyn_cast<llvm::ArrayType>(ST->getElementType(0));
+      if (AT && AT->getNumElements() == 8 &&
+          AT->getElementType()->isIntegerTy(64))
+        return true;
+    }
+  }
+  return TargetCodeGenInfo::isScalarizableAsmOperand(CGF, Ty);
+}
+
+void WindowsAArch64TargetCodeGenInfo::getDependentLibraryOption(
+    llvm::StringRef Lib, SmallString<24> &Opt) const {
+  Opt = "/DEFAULTLIB:" + qualifyWindowsLibrary(Lib);
+}
+
+void WindowsAArch64TargetCodeGenInfo::setTargetAttributes(
+    const Decl *D, llvm::GlobalValue *GV, CodeGen::CodeGenModule &CGM) const {
+  AArch64TargetCodeGenInfo::setTargetAttributes(D, GV, CGM);
+  if (GV->isDeclaration())
+    return;
+  addStackProbeTargetAttributes(D, GV, CGM);
+}
+
+ABIArgInfo AArch64ABIInfo::coerceIllegalVector(QualType Ty) const {
+  assert(Ty->isVectorType() && "expected vector type!");
+
+  const auto *VT = Ty->castAs<VectorType>();
+  if (VT->getVectorKind() == VectorType::SveFixedLengthPredicateVector) {
+    assert(VT->getElementType()->isBuiltinType() && "expected builtin type!");
+    assert(VT->getElementType()->castAs<BuiltinType>()->getKind() ==
+               BuiltinType::UChar &&
+           "unexpected builtin type for SVE predicate!");
+    return ABIArgInfo::getDirect(llvm::ScalableVectorType::get(
+        llvm::Type::getInt1Ty(getVMContext()), 16));
+  }
+
+  if (VT->getVectorKind() == VectorType::SveFixedLengthDataVector) {
+    assert(VT->getElementType()->isBuiltinType() && "expected builtin type!");
+
+    const auto *BT = VT->getElementType()->castAs<BuiltinType>();
+    llvm::ScalableVectorType *ResType = nullptr;
+    switch (BT->getKind()) {
+    default:
+      llvm_unreachable("unexpected builtin type for SVE vector!");
+    case BuiltinType::SChar:
+    case BuiltinType::UChar:
+      ResType = llvm::ScalableVectorType::get(
+          llvm::Type::getInt8Ty(getVMContext()), 16);
+      break;
+    case BuiltinType::Short:
+    case BuiltinType::UShort:
+      ResType = llvm::ScalableVectorType::get(
+          llvm::Type::getInt16Ty(getVMContext()), 8);
+      break;
+    case BuiltinType::Int:
+    case BuiltinType::UInt:
+      ResType = llvm::ScalableVectorType::get(
+          llvm::Type::getInt32Ty(getVMContext()), 4);
+      break;
+    case BuiltinType::Long:
+    case BuiltinType::ULong:
+      ResType = llvm::ScalableVectorType::get(
+          llvm::Type::getInt64Ty(getVMContext()), 2);
+      break;
+    case BuiltinType::Half:
+      ResType = llvm::ScalableVectorType::get(
+          llvm::Type::getHalfTy(getVMContext()), 8);
+      break;
+    case BuiltinType::Float:
+      ResType = llvm::ScalableVectorType::get(
+          llvm::Type::getFloatTy(getVMContext()), 4);
+      break;
+    case BuiltinType::Double:
+      ResType = llvm::ScalableVectorType::get(
+          llvm::Type::getDoubleTy(getVMContext()), 2);
+      break;
+    case BuiltinType::BFloat16:
+      ResType = llvm::ScalableVectorType::get(
+          llvm::Type::getBFloatTy(getVMContext()), 8);
+      break;
+    }
+    return ABIArgInfo::getDirect(ResType);
+  }
+
+  uint64_t Size = getContext().getTypeSize(Ty);
+  // Android promotes <2 x i8> to i16, not i32
+  if ((isAndroid() || isOHOSFamily()) && (Size <= 16)) {
+    llvm::Type *ResType = llvm::Type::getInt16Ty(getVMContext());
+    return ABIArgInfo::getDirect(ResType);
+  }
+  if (Size <= 32) {
+    llvm::Type *ResType = llvm::Type::getInt32Ty(getVMContext());
+    return ABIArgInfo::getDirect(ResType);
+  }
+  if (Size == 64) {
+    auto *ResType =
+        llvm::FixedVectorType::get(llvm::Type::getInt32Ty(getVMContext()), 2);
+    return ABIArgInfo::getDirect(ResType);
+  }
+  if (Size == 128) {
+    auto *ResType =
+        llvm::FixedVectorType::get(llvm::Type::getInt32Ty(getVMContext()), 4);
+    return ABIArgInfo::getDirect(ResType);
+  }
+  return getNaturalAlignIndirect(Ty, /*ByVal=*/false);
+}
+
+ABIArgInfo
+AArch64ABIInfo::classifyArgumentType(QualType Ty, bool IsVariadic,
+                                     unsigned CallingConvention) const {
+  Ty = useFirstFieldIfTransparentUnion(Ty);
+
+  // Handle illegal vector types here.
+  if (isIllegalVectorType(Ty))
+    return coerceIllegalVector(Ty);
+
+  if (!isAggregateTypeForABI(Ty)) {
+    // Treat an enum type as its underlying type.
+    if (const EnumType *EnumTy = Ty->getAs<EnumType>())
+      Ty = EnumTy->getDecl()->getIntegerType();
+
+    if (const auto *EIT = Ty->getAs<BitIntType>())
+      if (EIT->getNumBits() > 128)
+        return getNaturalAlignIndirect(Ty);
+
+    return (isPromotableIntegerTypeForABI(Ty) && isDarwinPCS()
+                ? ABIArgInfo::getExtend(Ty)
+                : ABIArgInfo::getDirect());
+  }
+
+  // Structures with either a non-trivial destructor or a non-trivial
+  // copy constructor are always indirect.
+  if (CGCXXABI::RecordArgABI RAA = getRecordArgABI(Ty, getCXXABI())) {
+    return getNaturalAlignIndirect(Ty, /*ByVal=*/RAA ==
+                                           CGCXXABI::RAA_DirectInMemory);
+  }
+
+  // Empty records are always ignored on Darwin, but actually passed in C++ mode
+  // elsewhere for GNU compatibility.
+  uint64_t Size = getContext().getTypeSize(Ty);
+  bool IsEmpty = isEmptyRecord(getContext(), Ty, true);
+  if (IsEmpty || Size == 0) {
+    if (!getContext().getLangOpts().CPlusPlus || isDarwinPCS())
+      return ABIArgInfo::getIgnore();
+
+    // GNU C mode. The only argument that gets ignored is an empty one with size
+    // 0.
+    if (IsEmpty && Size == 0)
+      return ABIArgInfo::getIgnore();
+    return ABIArgInfo::getDirect(llvm::Type::getInt8Ty(getVMContext()));
+  }
+
+  // Homogeneous Floating-point Aggregates (HFAs) need to be expanded.
+  const Type *Base = nullptr;
+  uint64_t Members = 0;
+  bool IsWin64 = Kind == AArch64ABIKind::Win64 ||
+                 CallingConvention == llvm::CallingConv::Win64;
+  bool IsWinVariadic = IsWin64 && IsVariadic;
+  // In variadic functions on Windows, all composite types are treated alike,
+  // no special handling of HFAs/HVAs.
+  if (!IsWinVariadic && isHomogeneousAggregate(Ty, Base, Members)) {
+    if (Kind != AArch64ABIKind::AAPCS)
+      return ABIArgInfo::getDirect(
+          llvm::ArrayType::get(CGT.ConvertType(QualType(Base, 0)), Members));
+
+    // For alignment adjusted HFAs, cap the argument alignment to 16, leave it
+    // default otherwise.
+    unsigned Align =
+        getContext().getTypeUnadjustedAlignInChars(Ty).getQuantity();
+    unsigned BaseAlign = getContext().getTypeAlignInChars(Base).getQuantity();
+    Align = (Align > BaseAlign && Align >= 16) ? 16 : 0;
+    return ABIArgInfo::getDirect(
+        llvm::ArrayType::get(CGT.ConvertType(QualType(Base, 0)), Members), 0,
+        nullptr, true, Align);
+  }
+
+  // Aggregates <= 16 bytes are passed directly in registers or on the stack.
+  if (Size <= 128) {
+    // On RenderScript, coerce Aggregates <= 16 bytes to an integer array of
+    // same size and alignment.
+    if (getTarget().isRenderScriptTarget()) {
+      return coerceToIntArray(Ty, getContext(), getVMContext());
+    }
+    unsigned Alignment;
+    if (Kind == AArch64ABIKind::AAPCS) {
+      Alignment = getContext().getTypeUnadjustedAlign(Ty);
+      Alignment = Alignment < 128 ? 64 : 128;
+    } else {
+      Alignment =
+          std::max(getContext().getTypeAlign(Ty),
+                   (unsigned)getTarget().getPointerWidth(LangAS::Default));
+    }
+    Size = llvm::alignTo(Size, Alignment);
+
+    // We use a pair of i64 for 16-byte aggregate with 8-byte alignment.
+    // For aggregates with 16-byte alignment, we use i128.
+    llvm::Type *BaseTy = llvm::Type::getIntNTy(getVMContext(), Alignment);
+    return ABIArgInfo::getDirect(
+        Size == Alignment ? BaseTy
+                          : llvm::ArrayType::get(BaseTy, Size / Alignment));
+  }
+
+  return getNaturalAlignIndirect(Ty, /*ByVal=*/false);
+}
+
+ABIArgInfo AArch64ABIInfo::classifyReturnType(QualType RetTy,
+                                              bool IsVariadic) const {
+  if (RetTy->isVoidType())
+    return ABIArgInfo::getIgnore();
+
+  if (const auto *VT = RetTy->getAs<VectorType>()) {
+    if (VT->getVectorKind() == VectorType::SveFixedLengthDataVector ||
+        VT->getVectorKind() == VectorType::SveFixedLengthPredicateVector)
+      return coerceIllegalVector(RetTy);
+  }
+
+  // Large vector types should be returned via memory.
+  if (RetTy->isVectorType() && getContext().getTypeSize(RetTy) > 128)
+    return getNaturalAlignIndirect(RetTy);
+
+  if (!isAggregateTypeForABI(RetTy)) {
+    // Treat an enum type as its underlying type.
+    if (const EnumType *EnumTy = RetTy->getAs<EnumType>())
+      RetTy = EnumTy->getDecl()->getIntegerType();
+
+    if (const auto *EIT = RetTy->getAs<BitIntType>())
+      if (EIT->getNumBits() > 128)
+        return getNaturalAlignIndirect(RetTy);
+
+    return (isPromotableIntegerTypeForABI(RetTy) && isDarwinPCS()
+                ? ABIArgInfo::getExtend(RetTy)
+                : ABIArgInfo::getDirect());
+  }
+
+  uint64_t Size = getContext().getTypeSize(RetTy);
+  if (isEmptyRecord(getContext(), RetTy, true) || Size == 0)
+    return ABIArgInfo::getIgnore();
+
+  const Type *Base = nullptr;
+  uint64_t Members = 0;
+  if (isHomogeneousAggregate(RetTy, Base, Members) &&
+      !(getTarget().getTriple().getArch() == llvm::Triple::aarch64_32 &&
+        IsVariadic))
+    // Homogeneous Floating-point Aggregates (HFAs) are returned directly.
+    return ABIArgInfo::getDirect();
+
+  // Aggregates <= 16 bytes are returned directly in registers or on the stack.
+  if (Size <= 128) {
+    // On RenderScript, coerce Aggregates <= 16 bytes to an integer array of
+    // same size and alignment.
+    if (getTarget().isRenderScriptTarget()) {
+      return coerceToIntArray(RetTy, getContext(), getVMContext());
+    }
+
+    if (Size <= 64 && getDataLayout().isLittleEndian()) {
+      // Composite types are returned in lower bits of a 64-bit register for LE,
+      // and in higher bits for BE. However, integer types are always returned
+      // in lower bits for both LE and BE, and they are not rounded up to
+      // 64-bits. We can skip rounding up of composite types for LE, but not for
+      // BE, otherwise composite types will be indistinguishable from integer
+      // types.
+      return ABIArgInfo::getDirect(
+          llvm::IntegerType::get(getVMContext(), Size));
+    }
+
+    unsigned Alignment = getContext().getTypeAlign(RetTy);
+    Size = llvm::alignTo(Size, 64); // round up to multiple of 8 bytes
+
+    // We use a pair of i64 for 16-byte aggregate with 8-byte alignment.
+    // For aggregates with 16-byte alignment, we use i128.
+    if (Alignment < 128 && Size == 128) {
+      llvm::Type *BaseTy = llvm::Type::getInt64Ty(getVMContext());
+      return ABIArgInfo::getDirect(llvm::ArrayType::get(BaseTy, Size / 64));
+    }
+    return ABIArgInfo::getDirect(llvm::IntegerType::get(getVMContext(), Size));
+  }
+
+  return getNaturalAlignIndirect(RetTy);
+}
+
+/// isIllegalVectorType - check whether the vector type is legal for AArch64.
+bool AArch64ABIInfo::isIllegalVectorType(QualType Ty) const {
+  if (const VectorType *VT = Ty->getAs<VectorType>()) {
+    // Check whether VT is a fixed-length SVE vector. These types are
+    // represented as scalable vectors in function args/return and must be
+    // coerced from fixed vectors.
+    if (VT->getVectorKind() == VectorType::SveFixedLengthDataVector ||
+        VT->getVectorKind() == VectorType::SveFixedLengthPredicateVector)
+      return true;
+
+    // Check whether VT is legal.
+    unsigned NumElements = VT->getNumElements();
+    uint64_t Size = getContext().getTypeSize(VT);
+    // NumElements should be power of 2.
+    if (!llvm::isPowerOf2_32(NumElements))
+      return true;
+
+    // arm64_32 has to be compatible with the ARM logic here, which allows huge
+    // vectors for some reason.
+    llvm::Triple Triple = getTarget().getTriple();
+    if (Triple.getArch() == llvm::Triple::aarch64_32 &&
+        Triple.isOSBinFormatMachO())
+      return Size <= 32;
+
+    return Size != 64 && (Size != 128 || NumElements == 1);
+  }
+  return false;
+}
+
+bool AArch64SwiftABIInfo::isLegalVectorType(CharUnits VectorSize,
+                                            llvm::Type *EltTy,
+                                            unsigned NumElts) const {
+  if (!llvm::isPowerOf2_32(NumElts))
+    return false;
+  if (VectorSize.getQuantity() != 8 &&
+      (VectorSize.getQuantity() != 16 || NumElts == 1))
+    return false;
+  return true;
+}
+
+bool AArch64ABIInfo::isHomogeneousAggregateBaseType(QualType Ty) const {
+  // Homogeneous aggregates for AAPCS64 must have base types of a floating
+  // point type or a short-vector type. This is the same as the 32-bit ABI,
+  // but with the difference that any floating-point type is allowed,
+  // including __fp16.
+  if (const BuiltinType *BT = Ty->getAs<BuiltinType>()) {
+    if (BT->isFloatingPoint())
+      return true;
+  } else if (const VectorType *VT = Ty->getAs<VectorType>()) {
+    unsigned VecSize = getContext().getTypeSize(VT);
+    if (VecSize == 64 || VecSize == 128)
+      return true;
+  }
+  return false;
+}
+
+bool AArch64ABIInfo::isHomogeneousAggregateSmallEnough(const Type *Base,
+                                                       uint64_t Members) const {
+  return Members <= 4;
+}
+
+bool AArch64ABIInfo::isZeroLengthBitfieldPermittedInHomogeneousAggregate()
+    const {
+  // AAPCS64 says that the rule for whether something is a homogeneous
+  // aggregate is applied to the output of the data layout decision. So
+  // anything that doesn't affect the data layout also does not affect
+  // homogeneity. In particular, zero-length bitfields don't stop a struct
+  // being homogeneous.
+  return true;
+}
+
+Address AArch64ABIInfo::EmitAAPCSVAArg(Address VAListAddr, QualType Ty,
+                                       CodeGenFunction &CGF) const {
+  ABIArgInfo AI = classifyArgumentType(Ty, /*IsVariadic=*/true,
+                                       CGF.CurFnInfo->getCallingConvention());
+  // Empty records are ignored for parameter passing purposes.
+  if (AI.isIgnore()) {
+    uint64_t PointerSize = getTarget().getPointerWidth(LangAS::Default) / 8;
+    CharUnits SlotSize = CharUnits::fromQuantity(PointerSize);
+    VAListAddr = CGF.Builder.CreateElementBitCast(VAListAddr, CGF.Int8PtrTy);
+    auto *Load = CGF.Builder.CreateLoad(VAListAddr);
+    Address Addr = Address(Load, CGF.Int8Ty, SlotSize);
+    return CGF.Builder.CreateElementBitCast(Addr, CGF.ConvertTypeForMem(Ty));
+  }
+
+  bool IsIndirect = AI.isIndirect();
+
+  llvm::Type *BaseTy = CGF.ConvertType(Ty);
+  if (IsIndirect)
+    BaseTy = llvm::PointerType::getUnqual(BaseTy);
+  else if (AI.getCoerceToType())
+    BaseTy = AI.getCoerceToType();
+
+  unsigned NumRegs = 1;
+  if (llvm::ArrayType *ArrTy = dyn_cast<llvm::ArrayType>(BaseTy)) {
+    BaseTy = ArrTy->getElementType();
+    NumRegs = ArrTy->getNumElements();
+  }
+  bool IsFPR = BaseTy->isFloatingPointTy() || BaseTy->isVectorTy();
+
+  // The AArch64 va_list type and handling is specified in the Procedure Call
+  // Standard, section B.4:
+  //
+  // struct {
+  //   void *__stack;
+  //   void *__gr_top;
+  //   void *__vr_top;
+  //   int __gr_offs;
+  //   int __vr_offs;
+  // };
+
+  llvm::BasicBlock *MaybeRegBlock = CGF.createBasicBlock("vaarg.maybe_reg");
+  llvm::BasicBlock *InRegBlock = CGF.createBasicBlock("vaarg.in_reg");
+  llvm::BasicBlock *OnStackBlock = CGF.createBasicBlock("vaarg.on_stack");
+  llvm::BasicBlock *ContBlock = CGF.createBasicBlock("vaarg.end");
+
+  CharUnits TySize = getContext().getTypeSizeInChars(Ty);
+  CharUnits TyAlign = getContext().getTypeUnadjustedAlignInChars(Ty);
+
+  Address reg_offs_p = Address::invalid();
+  llvm::Value *reg_offs = nullptr;
+  int reg_top_index;
+  int RegSize = IsIndirect ? 8 : TySize.getQuantity();
+  if (!IsFPR) {
+    // 3 is the field number of __gr_offs
+    reg_offs_p = CGF.Builder.CreateStructGEP(VAListAddr, 3, "gr_offs_p");
+    reg_offs = CGF.Builder.CreateLoad(reg_offs_p, "gr_offs");
+    reg_top_index = 1; // field number for __gr_top
+    RegSize = llvm::alignTo(RegSize, 8);
+  } else {
+    // 4 is the field number of __vr_offs.
+    reg_offs_p = CGF.Builder.CreateStructGEP(VAListAddr, 4, "vr_offs_p");
+    reg_offs = CGF.Builder.CreateLoad(reg_offs_p, "vr_offs");
+    reg_top_index = 2; // field number for __vr_top
+    RegSize = 16 * NumRegs;
+  }
+
+  //=======================================
+  // Find out where argument was passed
+  //=======================================
+
+  // If reg_offs >= 0 we're already using the stack for this type of
+  // argument. We don't want to keep updating reg_offs (in case it overflows,
+  // though anyone passing 2GB of arguments, each at most 16 bytes, deserves
+  // whatever they get).
+  llvm::Value *UsingStack = nullptr;
+  UsingStack = CGF.Builder.CreateICmpSGE(
+      reg_offs, llvm::ConstantInt::get(CGF.Int32Ty, 0));
+
+  CGF.Builder.CreateCondBr(UsingStack, OnStackBlock, MaybeRegBlock);
+
+  // Otherwise, at least some kind of argument could go in these registers, the
+  // question is whether this particular type is too big.
+  CGF.EmitBlock(MaybeRegBlock);
+
+  // Integer arguments may need to correct register alignment (for example a
+  // "struct { __int128 a; };" gets passed in x_2N, x_{2N+1}). In this case we
+  // align __gr_offs to calculate the potential address.
+  if (!IsFPR && !IsIndirect && TyAlign.getQuantity() > 8) {
+    int Align = TyAlign.getQuantity();
+
+    reg_offs = CGF.Builder.CreateAdd(
+        reg_offs, llvm::ConstantInt::get(CGF.Int32Ty, Align - 1),
+        "align_regoffs");
+    reg_offs = CGF.Builder.CreateAnd(
+        reg_offs, llvm::ConstantInt::get(CGF.Int32Ty, -Align),
+        "aligned_regoffs");
+  }
+
+  // Update the gr_offs/vr_offs pointer for next call to va_arg on this va_list.
+  // The fact that this is done unconditionally reflects the fact that
+  // allocating an argument to the stack also uses up all the remaining
+  // registers of the appropriate kind.
+  llvm::Value *NewOffset = nullptr;
+  NewOffset = CGF.Builder.CreateAdd(
+      reg_offs, llvm::ConstantInt::get(CGF.Int32Ty, RegSize), "new_reg_offs");
+  CGF.Builder.CreateStore(NewOffset, reg_offs_p);
+
+  // Now we're in a position to decide whether this argument really was in
+  // registers or not.
+  llvm::Value *InRegs = nullptr;
+  InRegs = CGF.Builder.CreateICmpSLE(
+      NewOffset, llvm::ConstantInt::get(CGF.Int32Ty, 0), "inreg");
+
+  CGF.Builder.CreateCondBr(InRegs, InRegBlock, OnStackBlock);
+
+  //=======================================
+  // Argument was in registers
+  //=======================================
+
+  // Now we emit the code for if the argument was originally passed in
+  // registers. First start the appropriate block:
+  CGF.EmitBlock(InRegBlock);
+
+  llvm::Value *reg_top = nullptr;
+  Address reg_top_p =
+      CGF.Builder.CreateStructGEP(VAListAddr, reg_top_index, "reg_top_p");
+  reg_top = CGF.Builder.CreateLoad(reg_top_p, "reg_top");
+  Address BaseAddr(CGF.Builder.CreateInBoundsGEP(CGF.Int8Ty, reg_top, reg_offs),
+                   CGF.Int8Ty, CharUnits::fromQuantity(IsFPR ? 16 : 8));
+  Address RegAddr = Address::invalid();
+  llvm::Type *MemTy = CGF.ConvertTypeForMem(Ty), *ElementTy = MemTy;
+
+  if (IsIndirect) {
+    // If it's been passed indirectly (actually a struct), whatever we find from
+    // stored registers or on the stack will actually be a struct **.
+    MemTy = llvm::PointerType::getUnqual(MemTy);
+  }
+
+  const Type *Base = nullptr;
+  uint64_t NumMembers = 0;
+  bool IsHFA = isHomogeneousAggregate(Ty, Base, NumMembers);
+  if (IsHFA && NumMembers > 1) {
+    // Homogeneous aggregates passed in registers will have their elements split
+    // and stored 16-bytes apart regardless of size (they're notionally in qN,
+    // qN+1, ...). We reload and store into a temporary local variable
+    // contiguously.
+    assert(!IsIndirect && "Homogeneous aggregates should be passed directly");
+    auto BaseTyInfo = getContext().getTypeInfoInChars(QualType(Base, 0));
+    llvm::Type *BaseTy = CGF.ConvertType(QualType(Base, 0));
+    llvm::Type *HFATy = llvm::ArrayType::get(BaseTy, NumMembers);
+    Address Tmp =
+        CGF.CreateTempAlloca(HFATy, std::max(TyAlign, BaseTyInfo.Align));
+
+    // On big-endian platforms, the value will be right-aligned in its slot.
+    int Offset = 0;
+    if (CGF.CGM.getDataLayout().isBigEndian() &&
+        BaseTyInfo.Width.getQuantity() < 16)
+      Offset = 16 - BaseTyInfo.Width.getQuantity();
+
+    for (unsigned i = 0; i < NumMembers; ++i) {
+      CharUnits BaseOffset = CharUnits::fromQuantity(16 * i + Offset);
+      Address LoadAddr =
+          CGF.Builder.CreateConstInBoundsByteGEP(BaseAddr, BaseOffset);
+      LoadAddr = CGF.Builder.CreateElementBitCast(LoadAddr, BaseTy);
+
+      Address StoreAddr = CGF.Builder.CreateConstArrayGEP(Tmp, i);
+
+      llvm::Value *Elem = CGF.Builder.CreateLoad(LoadAddr);
+      CGF.Builder.CreateStore(Elem, StoreAddr);
+    }
+
+    RegAddr = CGF.Builder.CreateElementBitCast(Tmp, MemTy);
+  } else {
+    // Otherwise the object is contiguous in memory.
+
+    // It might be right-aligned in its slot.
+    CharUnits SlotSize = BaseAddr.getAlignment();
+    if (CGF.CGM.getDataLayout().isBigEndian() && !IsIndirect &&
+        (IsHFA || !isAggregateTypeForABI(Ty)) && TySize < SlotSize) {
+      CharUnits Offset = SlotSize - TySize;
+      BaseAddr = CGF.Builder.CreateConstInBoundsByteGEP(BaseAddr, Offset);
+    }
+
+    RegAddr = CGF.Builder.CreateElementBitCast(BaseAddr, MemTy);
+  }
+
+  CGF.EmitBranch(ContBlock);
+
+  //=======================================
+  // Argument was on the stack
+  //=======================================
+  CGF.EmitBlock(OnStackBlock);
+
+  Address stack_p = CGF.Builder.CreateStructGEP(VAListAddr, 0, "stack_p");
+  llvm::Value *OnStackPtr = CGF.Builder.CreateLoad(stack_p, "stack");
+
+  // Again, stack arguments may need realignment. In this case both integer and
+  // floating-point ones might be affected.
+  if (!IsIndirect && TyAlign.getQuantity() > 8) {
+    int Align = TyAlign.getQuantity();
+
+    OnStackPtr = CGF.Builder.CreatePtrToInt(OnStackPtr, CGF.Int64Ty);
+
+    OnStackPtr = CGF.Builder.CreateAdd(
+        OnStackPtr, llvm::ConstantInt::get(CGF.Int64Ty, Align - 1),
+        "align_stack");
+    OnStackPtr = CGF.Builder.CreateAnd(
+        OnStackPtr, llvm::ConstantInt::get(CGF.Int64Ty, -Align), "align_stack");
+
+    OnStackPtr = CGF.Builder.CreateIntToPtr(OnStackPtr, CGF.Int8PtrTy);
+  }
+  Address OnStackAddr = Address(OnStackPtr, CGF.Int8Ty,
+                                std::max(CharUnits::fromQuantity(8), TyAlign));
+
+  // All stack slots are multiples of 8 bytes.
+  CharUnits StackSlotSize = CharUnits::fromQuantity(8);
+  CharUnits StackSize;
+  if (IsIndirect)
+    StackSize = StackSlotSize;
+  else
+    StackSize = TySize.alignTo(StackSlotSize);
+
+  llvm::Value *StackSizeC = CGF.Builder.getSize(StackSize);
+  llvm::Value *NewStack = CGF.Builder.CreateInBoundsGEP(
+      CGF.Int8Ty, OnStackPtr, StackSizeC, "new_stack");
+
+  // Write the new value of __stack for the next call to va_arg
+  CGF.Builder.CreateStore(NewStack, stack_p);
+
+  if (CGF.CGM.getDataLayout().isBigEndian() && !isAggregateTypeForABI(Ty) &&
+      TySize < StackSlotSize) {
+    CharUnits Offset = StackSlotSize - TySize;
+    OnStackAddr = CGF.Builder.CreateConstInBoundsByteGEP(OnStackAddr, Offset);
+  }
+
+  OnStackAddr = CGF.Builder.CreateElementBitCast(OnStackAddr, MemTy);
+
+  CGF.EmitBranch(ContBlock);
+
+  //=======================================
+  // Tidy up
+  //=======================================
+  CGF.EmitBlock(ContBlock);
+
+  Address ResAddr = emitMergePHI(CGF, RegAddr, InRegBlock, OnStackAddr,
+                                 OnStackBlock, "vaargs.addr");
+
+  if (IsIndirect)
+    return Address(CGF.Builder.CreateLoad(ResAddr, "vaarg.addr"), ElementTy,
+                   TyAlign);
+
+  return ResAddr;
+}
+
+Address AArch64ABIInfo::EmitDarwinVAArg(Address VAListAddr, QualType Ty,
+                                        CodeGenFunction &CGF) const {
+  // The backend's lowering doesn't support va_arg for aggregates or
+  // illegal vector types.  Lower VAArg here for these cases and use
+  // the LLVM va_arg instruction for everything else.
+  if (!isAggregateTypeForABI(Ty) && !isIllegalVectorType(Ty))
+    return EmitVAArgInstr(CGF, VAListAddr, Ty, ABIArgInfo::getDirect());
+
+  uint64_t PointerSize = getTarget().getPointerWidth(LangAS::Default) / 8;
+  CharUnits SlotSize = CharUnits::fromQuantity(PointerSize);
+
+  // Empty records are ignored for parameter passing purposes.
+  if (isEmptyRecord(getContext(), Ty, true)) {
+    Address Addr = Address(CGF.Builder.CreateLoad(VAListAddr, "ap.cur"),
+                           getVAListElementType(CGF), SlotSize);
+    Addr = CGF.Builder.CreateElementBitCast(Addr, CGF.ConvertTypeForMem(Ty));
+    return Addr;
+  }
+
+  // The size of the actual thing passed, which might end up just
+  // being a pointer for indirect types.
+  auto TyInfo = getContext().getTypeInfoInChars(Ty);
+
+  // Arguments bigger than 16 bytes which aren't homogeneous
+  // aggregates should be passed indirectly.
+  bool IsIndirect = false;
+  if (TyInfo.Width.getQuantity() > 16) {
+    const Type *Base = nullptr;
+    uint64_t Members = 0;
+    IsIndirect = !isHomogeneousAggregate(Ty, Base, Members);
+  }
+
+  return emitVoidPtrVAArg(CGF, VAListAddr, Ty, IsIndirect, TyInfo, SlotSize,
+                          /*AllowHigherAlign*/ true);
+}
+
+Address AArch64ABIInfo::EmitMSVAArg(CodeGenFunction &CGF, Address VAListAddr,
+                                    QualType Ty) const {
+  bool IsIndirect = false;
+
+  // Composites larger than 16 bytes are passed by reference.
+  if (isAggregateTypeForABI(Ty) && getContext().getTypeSize(Ty) > 128)
+    IsIndirect = true;
+
+  return emitVoidPtrVAArg(CGF, VAListAddr, Ty, IsIndirect,
+                          CGF.getContext().getTypeInfoInChars(Ty),
+                          CharUnits::fromQuantity(8),
+                          /*allowHigherAlign*/ false);
+}

clang/lib/CodeGen/Targets/AMDGPU.h

+//===- AMDGPU.h -------------------------------------------------*- C++ -*-===//
+//
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
+//
+//===----------------------------------------------------------------------===//
+
+#ifndef LLVM_CLANG_LIB_CODEGEN_TARGETS_AMDGPU_H
+#define LLVM_CLANG_LIB_CODEGEN_TARGETS_AMDGPU_H
+
+#include "TargetInfo.h"
+
+namespace clang::CodeGen {
+
+class LLVM_LIBRARY_VISIBILITY AMDGPUTargetCodeGenInfo
+    : public TargetCodeGenInfo {
+public:
+  AMDGPUTargetCodeGenInfo(CodeGenTypes &CGT);
+
+  void setFunctionDeclAttributes(const FunctionDecl *FD, llvm::Function *F,
+                                 CodeGenModule &CGM) const;
+
+  void setTargetAttributes(const Decl *D, llvm::GlobalValue *GV,
+                           CodeGen::CodeGenModule &M) const override;
+  unsigned getOpenCLKernelCallingConv() const override;
+
+  llvm::Constant *getNullPointer(const CodeGen::CodeGenModule &CGM,
+                                 llvm::PointerType *T,
+                                 QualType QT) const override;
+
+  LangAS getASTAllocaAddressSpace() const override;
+  LangAS getGlobalVarAddressSpace(CodeGenModule &CGM,
+                                  const VarDecl *D) const override;
+  llvm::SyncScope::ID getLLVMSyncScopeID(const LangOptions &LangOpts,
+                                         SyncScope Scope,
+                                         llvm::AtomicOrdering Ordering,
+                                         llvm::LLVMContext &Ctx) const override;
+  llvm::Value *createEnqueuedBlockKernel(CodeGenFunction &CGF,
+                                         llvm::Function *BlockInvokeFunc,
+                                         llvm::Type *BlockTy) const override;
+  bool shouldEmitStaticExternCAliases() const override;
+  bool shouldEmitDWARFBitFieldSeparators() const override;
+  void setCUDAKernelCallingConvention(const FunctionType *&FT) const override;
+};
+
+} // namespace clang::CodeGen
+
+#endif // LLVM_CLANG_LIB_CODEGEN_TARGETS_AMDGPU_H

clang/lib/CodeGen/Targets/AMDGPU.cpp

+//===- AMDGPU.cpp ---------------------------------------------------------===//
+//
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
+//
+//===----------------------------------------------------------------------===//
+
+#include "AMDGPU.h"
+#include "ABIInfoImpl.h"
+
+using namespace clang;
+using namespace clang::CodeGen;
+
+//===----------------------------------------------------------------------===//
+// AMDGPU ABI Implementation
+//===----------------------------------------------------------------------===//
+
+namespace {
+
+class AMDGPUABIInfo final : public DefaultABIInfo {
+private:
+  static const unsigned MaxNumRegsForArgsRet = 16;
+
+  unsigned numRegsForType(QualType Ty) const;
+
+  bool isHomogeneousAggregateBaseType(QualType Ty) const override;
+  bool isHomogeneousAggregateSmallEnough(const Type *Base,
+                                         uint64_t Members) const override;
+
+  // Coerce HIP scalar pointer arguments from generic pointers to global ones.
+  llvm::Type *coerceKernelArgumentType(llvm::Type *Ty, unsigned FromAS,
+                                       unsigned ToAS) const {
+    // Single value types.
+    auto *PtrTy = llvm::dyn_cast<llvm::PointerType>(Ty);
+    if (PtrTy && PtrTy->getAddressSpace() == FromAS)
+      return llvm::PointerType::getWithSamePointeeType(PtrTy, ToAS);
+    return Ty;
+  }
+
+public:
+  explicit AMDGPUABIInfo(CodeGen::CodeGenTypes &CGT) : DefaultABIInfo(CGT) {}
+
+  ABIArgInfo classifyReturnType(QualType RetTy) const;
+  ABIArgInfo classifyKernelArgumentType(QualType Ty) const;
+  ABIArgInfo classifyArgumentType(QualType Ty, unsigned &NumRegsLeft) const;
+
+  void computeInfo(CGFunctionInfo &FI) const override;
+  Address EmitVAArg(CodeGenFunction &CGF, Address VAListAddr,
+                    QualType Ty) const override;
+};
+
+bool AMDGPUABIInfo::isHomogeneousAggregateBaseType(QualType Ty) const {
+  return true;
+}
+
+bool AMDGPUABIInfo::isHomogeneousAggregateSmallEnough(const Type *Base,
+                                                      uint64_t Members) const {
+  uint32_t NumRegs = (getContext().getTypeSize(Base) + 31) / 32;
+
+  // Homogeneous Aggregates may occupy at most 16 registers.
+  return Members * NumRegs <= MaxNumRegsForArgsRet;
+}
+
+/// Estimate number of registers the type will use when passed in registers.
+unsigned AMDGPUABIInfo::numRegsForType(QualType Ty) const {
+  unsigned NumRegs = 0;
+
+  if (const VectorType *VT = Ty->getAs<VectorType>()) {
+    // Compute from the number of elements. The reported size is based on the
+    // in-memory size, which includes the padding 4th element for 3-vectors.
+    QualType EltTy = VT->getElementType();
+    unsigned EltSize = getContext().getTypeSize(EltTy);
+
+    // 16-bit element vectors should be passed as packed.
+    if (EltSize == 16)
+      return (VT->getNumElements() + 1) / 2;
+
+    unsigned EltNumRegs = (EltSize + 31) / 32;
+    return EltNumRegs * VT->getNumElements();
+  }
+
+  if (const RecordType *RT = Ty->getAs<RecordType>()) {
+    const RecordDecl *RD = RT->getDecl();
+    assert(!RD->hasFlexibleArrayMember());
+
+    for (const FieldDecl *Field : RD->fields()) {
+      QualType FieldTy = Field->getType();
+      NumRegs += numRegsForType(FieldTy);
+    }
+
+    return NumRegs;
+  }
+
+  return (getContext().getTypeSize(Ty) + 31) / 32;
+}
+
+void AMDGPUABIInfo::computeInfo(CGFunctionInfo &FI) const {
+  llvm::CallingConv::ID CC = FI.getCallingConvention();
+
+  if (!getCXXABI().classifyReturnType(FI))
+    FI.getReturnInfo() = classifyReturnType(FI.getReturnType());
+
+  unsigned NumRegsLeft = MaxNumRegsForArgsRet;
+  for (auto &Arg : FI.arguments()) {
+    if (CC == llvm::CallingConv::AMDGPU_KERNEL) {
+      Arg.info = classifyKernelArgumentType(Arg.type);
+    } else {
+      Arg.info = classifyArgumentType(Arg.type, NumRegsLeft);
+    }
+  }
+}
+
+Address AMDGPUABIInfo::EmitVAArg(CodeGenFunction &CGF, Address VAListAddr,
+                                 QualType Ty) const {
+  llvm_unreachable("AMDGPU does not support varargs");
+}
+
+ABIArgInfo AMDGPUABIInfo::classifyReturnType(QualType RetTy) const {
+  if (isAggregateTypeForABI(RetTy)) {
+    // Records with non-trivial destructors/copy-constructors should not be
+    // returned by value.
+    if (!getRecordArgABI(RetTy, getCXXABI())) {
+      // Ignore empty structs/unions.
+      if (isEmptyRecord(getContext(), RetTy, true))
+        return ABIArgInfo::getIgnore();
+
+      // Lower single-element structs to just return a regular value.
+      if (const Type *SeltTy = isSingleElementStruct(RetTy, getContext()))
+        return ABIArgInfo::getDirect(CGT.ConvertType(QualType(SeltTy, 0)));
+
+      if (const RecordType *RT = RetTy->getAs<RecordType>()) {
+        const RecordDecl *RD = RT->getDecl();
+        if (RD->hasFlexibleArrayMember())
+          return DefaultABIInfo::classifyReturnType(RetTy);
+      }
+
+      // Pack aggregates <= 4 bytes into single VGPR or pair.
+      uint64_t Size = getContext().getTypeSize(RetTy);
+      if (Size <= 16)
+        return ABIArgInfo::getDirect(llvm::Type::getInt16Ty(getVMContext()));
+
+      if (Size <= 32)
+        return ABIArgInfo::getDirect(llvm::Type::getInt32Ty(getVMContext()));
+
+      if (Size <= 64) {
+        llvm::Type *I32Ty = llvm::Type::getInt32Ty(getVMContext());
+        return ABIArgInfo::getDirect(llvm::ArrayType::get(I32Ty, 2));
+      }
+
+      if (numRegsForType(RetTy) <= MaxNumRegsForArgsRet)
+        return ABIArgInfo::getDirect();
+    }
+  }
+
+  // Otherwise just do the default thing.
+  return DefaultABIInfo::classifyReturnType(RetTy);
+}
+
+/// For kernels all parameters are really passed in a special buffer. It doesn't
+/// make sense to pass anything byval, so everything must be direct.
+ABIArgInfo AMDGPUABIInfo::classifyKernelArgumentType(QualType Ty) const {
+  Ty = useFirstFieldIfTransparentUnion(Ty);
+
+  // TODO: Can we omit empty structs?
+
+  if (const Type *SeltTy = isSingleElementStruct(Ty, getContext()))
+    Ty = QualType(SeltTy, 0);
+
+  llvm::Type *OrigLTy = CGT.ConvertType(Ty);
+  llvm::Type *LTy = OrigLTy;
+  if (getContext().getLangOpts().HIP) {
+    LTy = coerceKernelArgumentType(
+        OrigLTy, /*FromAS=*/getContext().getTargetAddressSpace(LangAS::Default),
+        /*ToAS=*/getContext().getTargetAddressSpace(LangAS::cuda_device));
+  }
+
+  // FIXME: Should also use this for OpenCL, but it requires addressing the
+  // problem of kernels being called.
+  //
+  // FIXME: This doesn't apply the optimization of coercing pointers in structs
+  // to global address space when using byref. This would require implementing a
+  // new kind of coercion of the in-memory type when for indirect arguments.
+  if (!getContext().getLangOpts().OpenCL && LTy == OrigLTy &&
+      isAggregateTypeForABI(Ty)) {
+    return ABIArgInfo::getIndirectAliased(
+        getContext().getTypeAlignInChars(Ty),
+        getContext().getTargetAddressSpace(LangAS::opencl_constant),
+        false /*Realign*/, nullptr /*Padding*/);
+  }
+
+  // If we set CanBeFlattened to true, CodeGen will expand the struct to its
+  // individual elements, which confuses the Clover OpenCL backend; therefore we
+  // have to set it to false here. Other args of getDirect() are just defaults.
+  return ABIArgInfo::getDirect(LTy, 0, nullptr, false);
+}
+
+ABIArgInfo AMDGPUABIInfo::classifyArgumentType(QualType Ty,
+                                               unsigned &NumRegsLeft) const {
+  assert(NumRegsLeft <= MaxNumRegsForArgsRet && "register estimate underflow");
+
+  Ty = useFirstFieldIfTransparentUnion(Ty);
+
+  if (isAggregateTypeForABI(Ty)) {
+    // Records with non-trivial destructors/copy-constructors should not be
+    // passed by value.
+    if (auto RAA = getRecordArgABI(Ty, getCXXABI()))
+      return getNaturalAlignIndirect(Ty, RAA == CGCXXABI::RAA_DirectInMemory);
+
+    // Ignore empty structs/unions.
+    if (isEmptyRecord(getContext(), Ty, true))
+      return ABIArgInfo::getIgnore();
+
+    // Lower single-element structs to just pass a regular value. TODO: We
+    // could do reasonable-size multiple-element structs too, using getExpand(),
+    // though watch out for things like bitfields.
+    if (const Type *SeltTy = isSingleElementStruct(Ty, getContext()))
+      return ABIArgInfo::getDirect(CGT.ConvertType(QualType(SeltTy, 0)));
+
+    if (const RecordType *RT = Ty->getAs<RecordType>()) {
+      const RecordDecl *RD = RT->getDecl();
+      if (RD->hasFlexibleArrayMember())
+        return DefaultABIInfo::classifyArgumentType(Ty);
+    }
+
+    // Pack aggregates <= 8 bytes into single VGPR or pair.
+    uint64_t Size = getContext().getTypeSize(Ty);
+    if (Size <= 64) {
+      unsigned NumRegs = (Size + 31) / 32;
+      NumRegsLeft -= std::min(NumRegsLeft, NumRegs);
+
+      if (Size <= 16)
+        return ABIArgInfo::getDirect(llvm::Type::getInt16Ty(getVMContext()));
+
+      if (Size <= 32)
+        return ABIArgInfo::getDirect(llvm::Type::getInt32Ty(getVMContext()));
+
+      // XXX: Should this be i64 instead, and should the limit increase?
+      llvm::Type *I32Ty = llvm::Type::getInt32Ty(getVMContext());
+      return ABIArgInfo::getDirect(llvm::ArrayType::get(I32Ty, 2));
+    }
+
+    if (NumRegsLeft > 0) {
+      unsigned NumRegs = numRegsForType(Ty);
+      if (NumRegsLeft >= NumRegs) {
+        NumRegsLeft -= NumRegs;
+        return ABIArgInfo::getDirect();
+      }
+    }
+  }
+
+  // Otherwise just do the default thing.
+  ABIArgInfo ArgInfo = DefaultABIInfo::classifyArgumentType(Ty);
+  if (!ArgInfo.isIndirect()) {
+    unsigned NumRegs = numRegsForType(Ty);
+    NumRegsLeft -= std::min(NumRegs, NumRegsLeft);
+  }
+
+  return ArgInfo;
+}
+
+} // namespace
+
+AMDGPUTargetCodeGenInfo::AMDGPUTargetCodeGenInfo(CodeGenTypes &CGT)
+    : TargetCodeGenInfo(std::make_unique<AMDGPUABIInfo>(CGT)) {}
+
+LangAS AMDGPUTargetCodeGenInfo::getASTAllocaAddressSpace() const {
+  return getLangASFromTargetAS(
+      getABIInfo().getDataLayout().getAllocaAddrSpace());
+}
+
+static bool requiresAMDGPUProtectedVisibility(const Decl *D,
+                                              llvm::GlobalValue *GV) {
+  if (GV->getVisibility() != llvm::GlobalValue::HiddenVisibility)
+    return false;
+
+  return D->hasAttr<OpenCLKernelAttr>() ||
+         (isa<FunctionDecl>(D) && D->hasAttr<CUDAGlobalAttr>()) ||
+         (isa<VarDecl>(D) &&
+          (D->hasAttr<CUDADeviceAttr>() || D->hasAttr<CUDAConstantAttr>() ||
+           cast<VarDecl>(D)->getType()->isCUDADeviceBuiltinSurfaceType() ||
+           cast<VarDecl>(D)->getType()->isCUDADeviceBuiltinTextureType()));
+}
+
+void AMDGPUTargetCodeGenInfo::setFunctionDeclAttributes(
+    const FunctionDecl *FD, llvm::Function *F, CodeGenModule &M) const {
+  const auto *ReqdWGS =
+      M.getLangOpts().OpenCL ? FD->getAttr<ReqdWorkGroupSizeAttr>() : nullptr;
+  const bool IsOpenCLKernel =
+      M.getLangOpts().OpenCL && FD->hasAttr<OpenCLKernelAttr>();
+  const bool IsHIPKernel = M.getLangOpts().HIP && FD->hasAttr<CUDAGlobalAttr>();
+
+  const auto *FlatWGS = FD->getAttr<AMDGPUFlatWorkGroupSizeAttr>();
+  if (ReqdWGS || FlatWGS) {
+    unsigned Min = 0;
+    unsigned Max = 0;
+    if (FlatWGS) {
+      Min = FlatWGS->getMin()
+                ->EvaluateKnownConstInt(M.getContext())
+                .getExtValue();
+      Max = FlatWGS->getMax()
+                ->EvaluateKnownConstInt(M.getContext())
+                .getExtValue();
+    }
+    if (ReqdWGS && Min == 0 && Max == 0)
+      Min = Max = ReqdWGS->getXDim() * ReqdWGS->getYDim() * ReqdWGS->getZDim();
+
+    if (Min != 0) {
+      assert(Min <= Max && "Min must be less than or equal Max");
+
+      std::string AttrVal = llvm::utostr(Min) + "," + llvm::utostr(Max);
+      F->addFnAttr("amdgpu-flat-work-group-size", AttrVal);
+    } else
+      assert(Max == 0 && "Max must be zero");
+  } else if (IsOpenCLKernel || IsHIPKernel) {
+    // By default, restrict the maximum size to a value specified by
+    // --gpu-max-threads-per-block=n or its default value for HIP.
+    const unsigned OpenCLDefaultMaxWorkGroupSize = 256;
+    const unsigned DefaultMaxWorkGroupSize =
+        IsOpenCLKernel ? OpenCLDefaultMaxWorkGroupSize
+                       : M.getLangOpts().GPUMaxThreadsPerBlock;
+    std::string AttrVal =
+        std::string("1,") + llvm::utostr(DefaultMaxWorkGroupSize);
+    F->addFnAttr("amdgpu-flat-work-group-size", AttrVal);
+  }
+
+  if (const auto *Attr = FD->getAttr<AMDGPUWavesPerEUAttr>()) {
+    unsigned Min =
+        Attr->getMin()->EvaluateKnownConstInt(M.getContext()).getExtValue();
+    unsigned Max = Attr->getMax() ? Attr->getMax()
+                                        ->EvaluateKnownConstInt(M.getContext())
+                                        .getExtValue()
+                                  : 0;
+
+    if (Min != 0) {
+      assert((Max == 0 || Min <= Max) && "Min must be less than or equal Max");
+
+      std::string AttrVal = llvm::utostr(Min);
+      if (Max != 0)
+        AttrVal = AttrVal + "," + llvm::utostr(Max);
+      F->addFnAttr("amdgpu-waves-per-eu", AttrVal);
+    } else
+      assert(Max == 0 && "Max must be zero");
+  }
+
+  if (const auto *Attr = FD->getAttr<AMDGPUNumSGPRAttr>()) {
+    unsigned NumSGPR = Attr->getNumSGPR();
+
+    if (NumSGPR != 0)
+      F->addFnAttr("amdgpu-num-sgpr", llvm::utostr(NumSGPR));
+  }
+
+  if (const auto *Attr = FD->getAttr<AMDGPUNumVGPRAttr>()) {
+    uint32_t NumVGPR = Attr->getNumVGPR();
+
+    if (NumVGPR != 0)
+      F->addFnAttr("amdgpu-num-vgpr", llvm::utostr(NumVGPR));
+  }
+}
+
+void AMDGPUTargetCodeGenInfo::setTargetAttributes(
+    const Decl *D, llvm::GlobalValue *GV, CodeGen::CodeGenModule &M) const {
+  if (requiresAMDGPUProtectedVisibility(D, GV)) {
+    GV->setVisibility(llvm::GlobalValue::ProtectedVisibility);
+    GV->setDSOLocal(true);
+  }
+
+  if (GV->isDeclaration())
+    return;
+
+  llvm::Function *F = dyn_cast<llvm::Function>(GV);
+  if (!F)
+    return;
+
+  const FunctionDecl *FD = dyn_cast_or_null<FunctionDecl>(D);
+  if (FD)
+    setFunctionDeclAttributes(FD, F, M);
+
+  const bool IsHIPKernel =
+      M.getLangOpts().HIP && FD && FD->hasAttr<CUDAGlobalAttr>();
+  const bool IsOpenMPkernel =
+      M.getLangOpts().OpenMPIsDevice &&
+      (F->getCallingConv() == llvm::CallingConv::AMDGPU_KERNEL);
+
+  // TODO: This should be moved to language specific attributes instead.
+  if (IsHIPKernel || IsOpenMPkernel)
+    F->addFnAttr("uniform-work-group-size", "true");
+
+  if (M.getContext().getTargetInfo().allowAMDGPUUnsafeFPAtomics())
+    F->addFnAttr("amdgpu-unsafe-fp-atomics", "true");
+
+  if (!getABIInfo().getCodeGenOpts().EmitIEEENaNCompliantInsts)
+    F->addFnAttr("amdgpu-ieee", "false");
+}
+
+unsigned AMDGPUTargetCodeGenInfo::getOpenCLKernelCallingConv() const {
+  return llvm::CallingConv::AMDGPU_KERNEL;
+}
+
+// Currently LLVM assumes null pointers always have value 0,
+// which results in incorrectly transformed IR. Therefore, instead of
+// emitting null pointers in private and local address spaces, a null
+// pointer in generic address space is emitted which is casted to a
+// pointer in local or private address space.
+llvm::Constant *
+AMDGPUTargetCodeGenInfo::getNullPointer(const CodeGen::CodeGenModule &CGM,
+                                        llvm::PointerType *PT,
+                                        QualType QT) const {
+  if (CGM.getContext().getTargetNullPointerValue(QT) == 0)
+    return llvm::ConstantPointerNull::get(PT);
+
+  auto &Ctx = CGM.getContext();
+  auto NPT = llvm::PointerType::getWithSamePointeeType(
+      PT, Ctx.getTargetAddressSpace(LangAS::opencl_generic));
+  return llvm::ConstantExpr::getAddrSpaceCast(
+      llvm::ConstantPointerNull::get(NPT), PT);
+}
+
+LangAS
+AMDGPUTargetCodeGenInfo::getGlobalVarAddressSpace(CodeGenModule &CGM,
+                                                  const VarDecl *D) const {
+  assert(!CGM.getLangOpts().OpenCL &&
+         !(CGM.getLangOpts().CUDA && CGM.getLangOpts().CUDAIsDevice) &&
+         "Address space agnostic languages only");
+  LangAS DefaultGlobalAS = getLangASFromTargetAS(
+      CGM.getContext().getTargetAddressSpace(LangAS::opencl_global));
+  if (!D)
+    return DefaultGlobalAS;
+
+  LangAS AddrSpace = D->getType().getAddressSpace();
+  assert(AddrSpace == LangAS::Default || isTargetAddressSpace(AddrSpace));
+  if (AddrSpace != LangAS::Default)
+    return AddrSpace;
+
+  // Only promote to address space 4 if VarDecl has constant initialization.
+  if (CGM.isTypeConstant(D->getType(), false, false) &&
+      D->hasConstantInitialization()) {
+    if (auto ConstAS = CGM.getTarget().getConstantAddressSpace())
+      return *ConstAS;
+  }
+  return DefaultGlobalAS;
+}
+
+llvm::SyncScope::ID AMDGPUTargetCodeGenInfo::getLLVMSyncScopeID(
+    const LangOptions &LangOpts, SyncScope Scope, llvm::AtomicOrdering Ordering,
+    llvm::LLVMContext &Ctx) const {
+  std::string Name;
+  switch (Scope) {
+  case SyncScope::HIPSingleThread:
+    Name = "singlethread";
+    break;
+  case SyncScope::HIPWavefront:
+  case SyncScope::OpenCLSubGroup:
+    Name = "wavefront";
+    break;
+  case SyncScope::HIPWorkgroup:
+  case SyncScope::OpenCLWorkGroup:
+    Name = "workgroup";
+    break;
+  case SyncScope::HIPAgent:
+  case SyncScope::OpenCLDevice:
+    Name = "agent";
+    break;
+  case SyncScope::HIPSystem:
+  case SyncScope::OpenCLAllSVMDevices:
+    Name = "";
+    break;
+  }
+
+  if (Ordering != llvm::AtomicOrdering::SequentiallyConsistent) {
+    if (!Name.empty())
+      Name = Twine(Twine(Name) + Twine("-")).str();
+
+    Name = Twine(Twine(Name) + Twine("one-as")).str();
+  }
+
+  return Ctx.getOrInsertSyncScopeID(Name);
+}
+
+bool AMDGPUTargetCodeGenInfo::shouldEmitStaticExternCAliases() const {
+  return false;
+}
+
+bool AMDGPUTargetCodeGenInfo::shouldEmitDWARFBitFieldSeparators() const {
+  return true;
+}
+
+void AMDGPUTargetCodeGenInfo::setCUDAKernelCallingConvention(
+    const FunctionType *&FT) const {
+  FT = getABIInfo().getContext().adjustFunctionType(
+      FT, FT->getExtInfo().withCallingConv(CC_OpenCLKernel));
+}
+
+/// Create an OpenCL kernel for an enqueued block.
+///
+/// The type of the first argument (the block literal) is the struct type
+/// of the block literal instead of a pointer type. The first argument
+/// (block literal) is passed directly by value to the kernel. The kernel
+/// allocates the same type of struct on stack and stores the block literal
+/// to it and passes its pointer to the block invoke function. The kernel
+/// has "enqueued-block" function attribute and kernel argument metadata.
+llvm::Value *AMDGPUTargetCodeGenInfo::createEnqueuedBlockKernel(
+    CodeGenFunction &CGF, llvm::Function *Invoke, llvm::Type *BlockTy) const {
+  auto &Builder = CGF.Builder;
+  auto &C = CGF.getLLVMContext();
+
+  auto *InvokeFT = Invoke->getFunctionType();
+  llvm::SmallVector<llvm::Type *, 2> ArgTys;
+  llvm::SmallVector<llvm::Metadata *, 8> AddressQuals;
+  llvm::SmallVector<llvm::Metadata *, 8> AccessQuals;
+  llvm::SmallVector<llvm::Metadata *, 8> ArgTypeNames;
+  llvm::SmallVector<llvm::Metadata *, 8> ArgBaseTypeNames;
+  llvm::SmallVector<llvm::Metadata *, 8> ArgTypeQuals;
+  llvm::SmallVector<llvm::Metadata *, 8> ArgNames;
+
+  ArgTys.push_back(BlockTy);
+  ArgTypeNames.push_back(llvm::MDString::get(C, "__block_literal"));
+  AddressQuals.push_back(llvm::ConstantAsMetadata::get(Builder.getInt32(0)));
+  ArgBaseTypeNames.push_back(llvm::MDString::get(C, "__block_literal"));
+  ArgTypeQuals.push_back(llvm::MDString::get(C, ""));
+  AccessQuals.push_back(llvm::MDString::get(C, "none"));
+  ArgNames.push_back(llvm::MDString::get(C, "block_literal"));
+  for (unsigned I = 1, E = InvokeFT->getNumParams(); I < E; ++I) {
+    ArgTys.push_back(InvokeFT->getParamType(I));
+    ArgTypeNames.push_back(llvm::MDString::get(C, "void*"));
+    AddressQuals.push_back(llvm::ConstantAsMetadata::get(Builder.getInt32(3)));
+    AccessQuals.push_back(llvm::MDString::get(C, "none"));
+    ArgBaseTypeNames.push_back(llvm::MDString::get(C, "void*"));
+    ArgTypeQuals.push_back(llvm::MDString::get(C, ""));
+    ArgNames.push_back(
+        llvm::MDString::get(C, (Twine("local_arg") + Twine(I)).str()));
+  }
+  std::string Name = Invoke->getName().str() + "_kernel";
+  auto *FT = llvm::FunctionType::get(llvm::Type::getVoidTy(C), ArgTys, false);
+  auto *F = llvm::Function::Create(FT, llvm::GlobalValue::InternalLinkage, Name,
+                                   &CGF.CGM.getModule());
+  F->setCallingConv(llvm::CallingConv::AMDGPU_KERNEL);
+
+  llvm::AttrBuilder KernelAttrs(C);
+  // FIXME: The invoke isn't applying the right attributes either
+  // FIXME: This is missing setTargetAttributes
+  CGF.CGM.addDefaultFunctionDefinitionAttributes(KernelAttrs);
+  KernelAttrs.addAttribute("enqueued-block");
+  F->addFnAttrs(KernelAttrs);
+
+  auto IP = CGF.Builder.saveIP();
+  auto *BB = llvm::BasicBlock::Create(C, "entry", F);
+  Builder.SetInsertPoint(BB);
+  const auto BlockAlign = CGF.CGM.getDataLayout().getPrefTypeAlign(BlockTy);
+  auto *BlockPtr = Builder.CreateAlloca(BlockTy, nullptr);
+  BlockPtr->setAlignment(BlockAlign);
+  Builder.CreateAlignedStore(F->arg_begin(), BlockPtr, BlockAlign);
+  auto *Cast = Builder.CreatePointerCast(BlockPtr, InvokeFT->getParamType(0));
+  llvm::SmallVector<llvm::Value *, 2> Args;
+  Args.push_back(Cast);
+  for (llvm::Argument &A : llvm::drop_begin(F->args()))
+    Args.push_back(&A);
+  llvm::CallInst *call = Builder.CreateCall(Invoke, Args);
+  call->setCallingConv(Invoke->getCallingConv());
+  Builder.CreateRetVoid();
+  Builder.restoreIP(IP);
+
+  F->setMetadata("kernel_arg_addr_space", llvm::MDNode::get(C, AddressQuals));
+  F->setMetadata("kernel_arg_access_qual", llvm::MDNode::get(C, AccessQuals));
+  F->setMetadata("kernel_arg_type", llvm::MDNode::get(C, ArgTypeNames));
+  F->setMetadata("kernel_arg_base_type",
+                 llvm::MDNode::get(C, ArgBaseTypeNames));
+  F->setMetadata("kernel_arg_type_qual", llvm::MDNode::get(C, ArgTypeQuals));
+  if (CGF.CGM.getCodeGenOpts().EmitOpenCLArgMetadata)
+    F->setMetadata("kernel_arg_name", llvm::MDNode::get(C, ArgNames));
+
+  return F;
+}

clang/lib/CodeGen/Targets/ARC.h

+//===- ARC.h ----------------------------------------------------*- C++ -*-===//
+//
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
+//
+//===----------------------------------------------------------------------===//
+
+#ifndef LLVM_CLANG_LIB_CODEGEN_TARGETS_ARC_H
+#define LLVM_CLANG_LIB_CODEGEN_TARGETS_ARC_H
+
+#include "TargetInfo.h"
+
+namespace clang::CodeGen {
+
+class LLVM_LIBRARY_VISIBILITY ARCTargetCodeGenInfo : public TargetCodeGenInfo {
+public:
+  ARCTargetCodeGenInfo(CodeGenTypes &CGT);
+};
+
+} // namespace clang::CodeGen
+
+#endif // LLVM_CLANG_LIB_CODEGEN_TARGETS_ARC_H

clang/lib/CodeGen/Targets/ARC.cpp

+//===- ARC.cpp ------------------------------------------------------------===//
+//
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
+//
+//===----------------------------------------------------------------------===//
+
+#include "ARC.h"
+#include "ABIInfoImpl.h"
+
+using namespace clang;
+using namespace clang::CodeGen;
+
+// ARC ABI implementation.
+namespace {
+
+class ARCABIInfo : public DefaultABIInfo {
+  struct CCState {
+    unsigned FreeRegs;
+  };
+
+public:
+  using DefaultABIInfo::DefaultABIInfo;
+
+private:
+  Address EmitVAArg(CodeGenFunction &CGF, Address VAListAddr,
+                    QualType Ty) const override;
+
+  void updateState(const ABIArgInfo &Info, QualType Ty, CCState &State) const {
+    if (!State.FreeRegs)
+      return;
+    if (Info.isIndirect() && Info.getInReg())
+      State.FreeRegs--;
+    else if (Info.isDirect() && Info.getInReg()) {
+      unsigned sz = (getContext().getTypeSize(Ty) + 31) / 32;
+      if (sz < State.FreeRegs)
+        State.FreeRegs -= sz;
+      else
+        State.FreeRegs = 0;
+    }
+  }
+
+  void computeInfo(CGFunctionInfo &FI) const override {
+    CCState State;
+    // ARC uses 8 registers to pass arguments.
+    State.FreeRegs = 8;
+
+    if (!getCXXABI().classifyReturnType(FI))
+      FI.getReturnInfo() = classifyReturnType(FI.getReturnType());
+    updateState(FI.getReturnInfo(), FI.getReturnType(), State);
+    for (auto &I : FI.arguments()) {
+      I.info = classifyArgumentType(I.type, State.FreeRegs);
+      updateState(I.info, I.type, State);
+    }
+  }
+
+  ABIArgInfo getIndirectByRef(QualType Ty, bool HasFreeRegs) const;
+  ABIArgInfo getIndirectByValue(QualType Ty) const;
+  ABIArgInfo classifyArgumentType(QualType Ty, uint8_t FreeRegs) const;
+  ABIArgInfo classifyReturnType(QualType RetTy) const;
+};
+} // namespace
+
+ARCTargetCodeGenInfo::ARCTargetCodeGenInfo(CodeGenTypes &CGT)
+    : TargetCodeGenInfo(std::make_unique<ARCABIInfo>(CGT)) {}
+
+ABIArgInfo ARCABIInfo::getIndirectByRef(QualType Ty, bool HasFreeRegs) const {
+  return HasFreeRegs ? getNaturalAlignIndirectInReg(Ty)
+                     : getNaturalAlignIndirect(Ty, false);
+}
+
+ABIArgInfo ARCABIInfo::getIndirectByValue(QualType Ty) const {
+  // Compute the byval alignment.
+  const unsigned MinABIStackAlignInBytes = 4;
+  unsigned TypeAlign = getContext().getTypeAlign(Ty) / 8;
+  return ABIArgInfo::getIndirect(CharUnits::fromQuantity(4), /*ByVal=*/true,
+                                 TypeAlign > MinABIStackAlignInBytes);
+}
+
+Address ARCABIInfo::EmitVAArg(CodeGenFunction &CGF, Address VAListAddr,
+                              QualType Ty) const {
+  return emitVoidPtrVAArg(CGF, VAListAddr, Ty, /*indirect*/ false,
+                          getContext().getTypeInfoInChars(Ty),
+                          CharUnits::fromQuantity(4), true);
+}
+
+ABIArgInfo ARCABIInfo::classifyArgumentType(QualType Ty,
+                                            uint8_t FreeRegs) const {
+  // Handle the generic C++ ABI.
+  const RecordType *RT = Ty->getAs<RecordType>();
+  if (RT) {
+    CGCXXABI::RecordArgABI RAA = getRecordArgABI(RT, getCXXABI());
+    if (RAA == CGCXXABI::RAA_Indirect)
+      return getIndirectByRef(Ty, FreeRegs > 0);
+
+    if (RAA == CGCXXABI::RAA_DirectInMemory)
+      return getIndirectByValue(Ty);
+  }
+
+  // Treat an enum type as its underlying type.
+  if (const EnumType *EnumTy = Ty->getAs<EnumType>())
+    Ty = EnumTy->getDecl()->getIntegerType();
+
+  auto SizeInRegs = llvm::alignTo(getContext().getTypeSize(Ty), 32) / 32;
+
+  if (isAggregateTypeForABI(Ty)) {
+    // Structures with flexible arrays are always indirect.
+    if (RT && RT->getDecl()->hasFlexibleArrayMember())
+      return getIndirectByValue(Ty);
+
+    // Ignore empty structs/unions.
+    if (isEmptyRecord(getContext(), Ty, true))
+      return ABIArgInfo::getIgnore();
+
+    llvm::LLVMContext &LLVMContext = getVMContext();
+
+    llvm::IntegerType *Int32 = llvm::Type::getInt32Ty(LLVMContext);
+    SmallVector<llvm::Type *, 3> Elements(SizeInRegs, Int32);
+    llvm::Type *Result = llvm::StructType::get(LLVMContext, Elements);
+
+    return FreeRegs >= SizeInRegs
+               ? ABIArgInfo::getDirectInReg(Result)
+               : ABIArgInfo::getDirect(Result, 0, nullptr, false);
+  }
+
+  if (const auto *EIT = Ty->getAs<BitIntType>())
+    if (EIT->getNumBits() > 64)
+      return getIndirectByValue(Ty);
+
+  return isPromotableIntegerTypeForABI(Ty)
+             ? (FreeRegs >= SizeInRegs ? ABIArgInfo::getExtendInReg(Ty)
+                                       : ABIArgInfo::getExtend(Ty))
+             : (FreeRegs >= SizeInRegs ? ABIArgInfo::getDirectInReg()
+                                       : ABIArgInfo::getDirect());
+}
+
+ABIArgInfo ARCABIInfo::classifyReturnType(QualType RetTy) const {
+  if (RetTy->isAnyComplexType())
+    return ABIArgInfo::getDirectInReg();
+
+  // Arguments of size > 4 registers are indirect.
+  auto RetSize = llvm::alignTo(getContext().getTypeSize(RetTy), 32) / 32;
+  if (RetSize > 4)
+    return getIndirectByRef(RetTy, /*HasFreeRegs*/ true);
+
+  return DefaultABIInfo::classifyReturnType(RetTy);
+}

clang/lib/CodeGen/Targets/ARM.h

+//===- ARM.h ----------------------------------------------------*- C++ -*-===//
+//
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
+//
+//===----------------------------------------------------------------------===//
+
+#ifndef LLVM_CLANG_LIB_CODEGEN_TARGETS_ARM_H
+#define LLVM_CLANG_LIB_CODEGEN_TARGETS_ARM_H
+
+#include "TargetInfo.h"
+
+namespace clang::CodeGen {
+
+enum class ARMABIKind {
+  APCS = 0,
+  AAPCS = 1,
+  AAPCS_VFP = 2,
+  AAPCS16_VFP = 3,
+};
+
+class LLVM_LIBRARY_VISIBILITY ARMTargetCodeGenInfo : public TargetCodeGenInfo {
+public:
+  ARMTargetCodeGenInfo(CodeGenTypes &CGT, ARMABIKind K);
+
+  int getDwarfEHStackPointer(CodeGen::CodeGenModule &M) const override {
+    return 13;
+  }
+
+  StringRef getARCRetainAutoreleasedReturnValueMarker() const override {
+    return "mov\tr7, r7\t\t// marker for objc_retainAutoreleaseReturnValue";
+  }
+
+  bool initDwarfEHRegSizeTable(CodeGen::CodeGenFunction &CGF,
+                               llvm::Value *Address) const override;
+
+  unsigned getSizeOfUnwindException() const override;
+
+  void setTargetAttributes(const Decl *D, llvm::GlobalValue *GV,
+                           CodeGen::CodeGenModule &CGM) const override;
+};
+
+class LLVM_LIBRARY_VISIBILITY WindowsARMTargetCodeGenInfo
+    : public ARMTargetCodeGenInfo {
+public:
+  WindowsARMTargetCodeGenInfo(CodeGenTypes &CGT, ARMABIKind K)
+      : ARMTargetCodeGenInfo(CGT, K) {}
+
+  void setTargetAttributes(const Decl *D, llvm::GlobalValue *GV,
+                           CodeGen::CodeGenModule &CGM) const override;
+
+  void getDependentLibraryOption(llvm::StringRef Lib,
+                                 llvm::SmallString<24> &Opt) const override;
+
+  void getDetectMismatchOption(llvm::StringRef Name, llvm::StringRef Value,
+                               llvm::SmallString<32> &Opt) const override {
+    Opt = "/FAILIFMISMATCH:\"" + Name.str() + "=" + Value.str() + "\"";
+  }
+};
+
+} // namespace clang::CodeGen
+
+#endif // LLVM_CLANG_LIB_CODEGEN_TARGETS_ARM_H

clang/lib/CodeGen/Targets/ARM.cpp

+//===- ARM.cpp ------------------------------------------------------------===//
+//
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
+//
+//===----------------------------------------------------------------------===//
+
+#include "ARM.h"
+#include "ABIInfoImpl.h"
+
+using namespace clang;
+using namespace clang::CodeGen;
+
+//===----------------------------------------------------------------------===//
+// ARM ABI Implementation
+//===----------------------------------------------------------------------===//
+
+namespace {
+
+class ARMABIInfo : public ABIInfo {
+  ARMABIKind Kind;
+  bool IsFloatABISoftFP;
+
+public:
+  ARMABIInfo(CodeGenTypes &CGT, ARMABIKind Kind) : ABIInfo(CGT), Kind(Kind) {
+    setCCs();
+    IsFloatABISoftFP = CGT.getCodeGenOpts().FloatABI == "softfp" ||
+                       CGT.getCodeGenOpts().FloatABI == ""; // default
+  }
+
+  bool isEABI() const {
+    switch (getTarget().getTriple().getEnvironment()) {
+    case llvm::Triple::Android:
+    case llvm::Triple::EABI:
+    case llvm::Triple::EABIHF:
+    case llvm::Triple::GNUEABI:
+    case llvm::Triple::GNUEABIHF:
+    case llvm::Triple::MuslEABI:
+    case llvm::Triple::MuslEABIHF:
+      return true;
+    default:
+      return getTarget().getTriple().isOHOSFamily();
+    }
+  }
+
+  bool isEABIHF() const {
+    switch (getTarget().getTriple().getEnvironment()) {
+    case llvm::Triple::EABIHF:
+    case llvm::Triple::GNUEABIHF:
+    case llvm::Triple::MuslEABIHF:
+      return true;
+    default:
+      return false;
+    }
+  }
+
+  ARMABIKind getABIKind() const { return Kind; }
+
+  bool allowBFloatArgsAndRet() const override {
+    return !IsFloatABISoftFP && getTarget().hasBFloat16Type();
+  }
+
+private:
+  ABIArgInfo classifyReturnType(QualType RetTy, bool isVariadic,
+                                unsigned functionCallConv) const;
+  ABIArgInfo classifyArgumentType(QualType RetTy, bool isVariadic,
+                                  unsigned functionCallConv) const;
+  ABIArgInfo classifyHomogeneousAggregate(QualType Ty, const Type *Base,
+                                          uint64_t Members) const;
+  ABIArgInfo coerceIllegalVector(QualType Ty) const;
+  bool isIllegalVectorType(QualType Ty) const;
+  bool containsAnyFP16Vectors(QualType Ty) const;
+
+  bool isHomogeneousAggregateBaseType(QualType Ty) const override;
+  bool isHomogeneousAggregateSmallEnough(const Type *Ty,
+                                         uint64_t Members) const override;
+  bool isZeroLengthBitfieldPermittedInHomogeneousAggregate() const override;
+
+  bool isEffectivelyAAPCS_VFP(unsigned callConvention, bool acceptHalf) const;
+
+  void computeInfo(CGFunctionInfo &FI) const override;
+
+  Address EmitVAArg(CodeGenFunction &CGF, Address VAListAddr,
+                    QualType Ty) const override;
+
+  llvm::CallingConv::ID getLLVMDefaultCC() const;
+  llvm::CallingConv::ID getABIDefaultCC() const;
+  void setCCs();
+};
+
+class ARMSwiftABIInfo : public SwiftABIInfo {
+public:
+  explicit ARMSwiftABIInfo(CodeGenTypes &CGT)
+      : SwiftABIInfo(CGT, /*SwiftErrorInRegister=*/true) {}
+
+  bool isLegalVectorType(CharUnits VectorSize, llvm::Type *EltTy,
+                         unsigned NumElts) const override;
+};
+
+} // namespace
+
+ARMTargetCodeGenInfo::ARMTargetCodeGenInfo(CodeGenTypes &CGT, ARMABIKind K)
+    : TargetCodeGenInfo(std::make_unique<ARMABIInfo>(CGT, K)) {
+  SwiftInfo = std::make_unique<ARMSwiftABIInfo>(CGT);
+}
+
+bool ARMTargetCodeGenInfo::initDwarfEHRegSizeTable(CodeGenFunction &CGF,
+                                                   llvm::Value *Address) const {
+  llvm::Value *Four8 = llvm::ConstantInt::get(CGF.Int8Ty, 4);
+
+  // 0-15 are the 16 integer registers.
+  AssignToArrayRange(CGF.Builder, Address, Four8, 0, 15);
+  return false;
+}
+
+unsigned ARMTargetCodeGenInfo::getSizeOfUnwindException() const {
+  if (static_cast<const ARMABIInfo &>(TargetCodeGenInfo::getABIInfo()).isEABI())
+    return 88;
+  return TargetCodeGenInfo::getSizeOfUnwindException();
+}
+
+void ARMTargetCodeGenInfo::setTargetAttributes(const Decl *D,
+                                               llvm::GlobalValue *GV,
+                                               CodeGenModule &CGM) const {
+  if (GV->isDeclaration())
+    return;
+  const FunctionDecl *FD = dyn_cast_or_null<FunctionDecl>(D);
+  if (!FD)
+    return;
+  auto *Fn = cast<llvm::Function>(GV);
+
+  if (const auto *TA = FD->getAttr<TargetAttr>()) {
+    ParsedTargetAttr Attr =
+        CGM.getTarget().parseTargetAttr(TA->getFeaturesStr());
+    if (!Attr.BranchProtection.empty()) {
+      TargetInfo::BranchProtectionInfo BPI;
+      StringRef DiagMsg;
+      StringRef Arch =
+          Attr.CPU.empty() ? CGM.getTarget().getTargetOpts().CPU : Attr.CPU;
+      if (!CGM.getTarget().validateBranchProtection(Attr.BranchProtection, Arch,
+                                                    BPI, DiagMsg)) {
+        CGM.getDiags().Report(
+            D->getLocation(),
+            diag::warn_target_unsupported_branch_protection_attribute)
+            << Arch;
+      } else {
+        static const char *SignReturnAddrStr[] = {"none", "non-leaf", "all"};
+        assert(static_cast<unsigned>(BPI.SignReturnAddr) <= 2 &&
+               "Unexpected SignReturnAddressScopeKind");
+        Fn->addFnAttr("sign-return-address",
+                      SignReturnAddrStr[static_cast<int>(BPI.SignReturnAddr)]);
+
+        Fn->addFnAttr("branch-target-enforcement",
+                      BPI.BranchTargetEnforcement ? "true" : "false");
+      }
+    } else if (CGM.getLangOpts().BranchTargetEnforcement ||
+               CGM.getLangOpts().hasSignReturnAddress()) {
+      // If the Branch Protection attribute is missing, validate the target
+      // Architecture attribute against Branch Protection command line
+      // settings.
+      if (!CGM.getTarget().isBranchProtectionSupportedArch(Attr.CPU))
+        CGM.getDiags().Report(
+            D->getLocation(),
+            diag::warn_target_unsupported_branch_protection_attribute)
+            << Attr.CPU;
+    }
+  }
+
+  const ARMInterruptAttr *Attr = FD->getAttr<ARMInterruptAttr>();
+  if (!Attr)
+    return;
+
+  const char *Kind;
+  switch (Attr->getInterrupt()) {
+  case ARMInterruptAttr::Generic:
+    Kind = "";
+    break;
+  case ARMInterruptAttr::IRQ:
+    Kind = "IRQ";
+    break;
+  case ARMInterruptAttr::FIQ:
+    Kind = "FIQ";
+    break;
+  case ARMInterruptAttr::SWI:
+    Kind = "SWI";
+    break;
+  case ARMInterruptAttr::ABORT:
+    Kind = "ABORT";
+    break;
+  case ARMInterruptAttr::UNDEF:
+    Kind = "UNDEF";
+    break;
+  }
+
+  Fn->addFnAttr("interrupt", Kind);
+
+  ARMABIKind ABI = static_cast<const ARMABIInfo &>(getABIInfo()).getABIKind();
+  if (ABI == ARMABIKind::APCS)
+    return;
+
+  // AAPCS guarantees that sp will be 8-byte aligned on any public interface,
+  // however this is not necessarily true on taking any interrupt. Instruct
+  // the backend to perform a realignment as part of the function prologue.
+  llvm::AttrBuilder B(Fn->getContext());
+  B.addStackAlignmentAttr(8);
+  Fn->addFnAttrs(B);
+}
+
+void WindowsARMTargetCodeGenInfo::getDependentLibraryOption(
+    llvm::StringRef Lib, SmallString<24> &Opt) const {
+  Opt = "/DEFAULTLIB:" + qualifyWindowsLibrary(Lib);
+}
+
+void WindowsARMTargetCodeGenInfo::setTargetAttributes(
+    const Decl *D, llvm::GlobalValue *GV, CodeGen::CodeGenModule &CGM) const {
+  ARMTargetCodeGenInfo::setTargetAttributes(D, GV, CGM);
+  if (GV->isDeclaration())
+    return;
+  addStackProbeTargetAttributes(D, GV, CGM);
+}
+
+void ARMABIInfo::computeInfo(CGFunctionInfo &FI) const {
+  if (!::classifyReturnType(getCXXABI(), FI, *this))
+    FI.getReturnInfo() = classifyReturnType(FI.getReturnType(), FI.isVariadic(),
+                                            FI.getCallingConvention());
+
+  for (auto &I : FI.arguments())
+    I.info = classifyArgumentType(I.type, FI.isVariadic(),
+                                  FI.getCallingConvention());
+
+  // Always honor user-specified calling convention.
+  if (FI.getCallingConvention() != llvm::CallingConv::C)
+    return;
+
+  llvm::CallingConv::ID cc = getRuntimeCC();
+  if (cc != llvm::CallingConv::C)
+    FI.setEffectiveCallingConvention(cc);
+}
+
+/// Return the default calling convention that LLVM will use.
+llvm::CallingConv::ID ARMABIInfo::getLLVMDefaultCC() const {
+  // The default calling convention that LLVM will infer.
+  if (isEABIHF() || getTarget().getTriple().isWatchABI())
+    return llvm::CallingConv::ARM_AAPCS_VFP;
+  else if (isEABI())
+    return llvm::CallingConv::ARM_AAPCS;
+  else
+    return llvm::CallingConv::ARM_APCS;
+}
+
+/// Return the calling convention that our ABI would like us to use
+/// as the C calling convention.
+llvm::CallingConv::ID ARMABIInfo::getABIDefaultCC() const {
+  switch (getABIKind()) {
+  case ARMABIKind::APCS:
+    return llvm::CallingConv::ARM_APCS;
+  case ARMABIKind::AAPCS:
+    return llvm::CallingConv::ARM_AAPCS;
+  case ARMABIKind::AAPCS_VFP:
+    return llvm::CallingConv::ARM_AAPCS_VFP;
+  case ARMABIKind::AAPCS16_VFP:
+    return llvm::CallingConv::ARM_AAPCS_VFP;
+  }
+  llvm_unreachable("bad ABI kind");
+}
+
+void ARMABIInfo::setCCs() {
+  assert(getRuntimeCC() == llvm::CallingConv::C);
+
+  // Don't muddy up the IR with a ton of explicit annotations if
+  // they'd just match what LLVM will infer from the triple.
+  llvm::CallingConv::ID abiCC = getABIDefaultCC();
+  if (abiCC != getLLVMDefaultCC())
+    RuntimeCC = abiCC;
+}
+
+ABIArgInfo ARMABIInfo::coerceIllegalVector(QualType Ty) const {
+  uint64_t Size = getContext().getTypeSize(Ty);
+  if (Size <= 32) {
+    llvm::Type *ResType = llvm::Type::getInt32Ty(getVMContext());
+    return ABIArgInfo::getDirect(ResType);
+  }
+  if (Size == 64 || Size == 128) {
+    auto *ResType = llvm::FixedVectorType::get(
+        llvm::Type::getInt32Ty(getVMContext()), Size / 32);
+    return ABIArgInfo::getDirect(ResType);
+  }
+  return getNaturalAlignIndirect(Ty, /*ByVal=*/false);
+}
+
+ABIArgInfo ARMABIInfo::classifyHomogeneousAggregate(QualType Ty,
+                                                    const Type *Base,
+                                                    uint64_t Members) const {
+  assert(Base && "Base class should be set for homogeneous aggregate");
+  // Base can be a floating-point or a vector.
+  if (const VectorType *VT = Base->getAs<VectorType>()) {
+    // FP16 vectors should be converted to integer vectors
+    if (!getTarget().hasLegalHalfType() && containsAnyFP16Vectors(Ty)) {
+      uint64_t Size = getContext().getTypeSize(VT);
+      auto *NewVecTy = llvm::FixedVectorType::get(
+          llvm::Type::getInt32Ty(getVMContext()), Size / 32);
+      llvm::Type *Ty = llvm::ArrayType::get(NewVecTy, Members);
+      return ABIArgInfo::getDirect(Ty, 0, nullptr, false);
+    }
+  }
+  unsigned Align = 0;
+  if (getABIKind() == ARMABIKind::AAPCS ||
+      getABIKind() == ARMABIKind::AAPCS_VFP) {
+    // For alignment adjusted HFAs, cap the argument alignment to 8, leave it
+    // default otherwise.
+    Align = getContext().getTypeUnadjustedAlignInChars(Ty).getQuantity();
+    unsigned BaseAlign = getContext().getTypeAlignInChars(Base).getQuantity();
+    Align = (Align > BaseAlign && Align >= 8) ? 8 : 0;
+  }
+  return ABIArgInfo::getDirect(nullptr, 0, nullptr, false, Align);
+}
+
+ABIArgInfo ARMABIInfo::classifyArgumentType(QualType Ty, bool isVariadic,
+                                            unsigned functionCallConv) const {
+  // 6.1.2.1 The following argument types are VFP CPRCs:
+  //   A single-precision floating-point type (including promoted
+  //   half-precision types); A double-precision floating-point type;
+  //   A 64-bit or 128-bit containerized vector type; Homogeneous Aggregate
+  //   with a Base Type of a single- or double-precision floating-point type,
+  //   64-bit containerized vectors or 128-bit containerized vectors with one
+  //   to four Elements.
+  // Variadic functions should always marshal to the base standard.
+  bool IsAAPCS_VFP = !isVariadic && isEffectivelyAAPCS_VFP(functionCallConv,
+                                                           /* AAPCS16 */ false);
+
+  Ty = useFirstFieldIfTransparentUnion(Ty);
+
+  // Handle illegal vector types here.
+  if (isIllegalVectorType(Ty))
+    return coerceIllegalVector(Ty);
+
+  if (!isAggregateTypeForABI(Ty)) {
+    // Treat an enum type as its underlying type.
+    if (const EnumType *EnumTy = Ty->getAs<EnumType>()) {
+      Ty = EnumTy->getDecl()->getIntegerType();
+    }
+
+    if (const auto *EIT = Ty->getAs<BitIntType>())
+      if (EIT->getNumBits() > 64)
+        return getNaturalAlignIndirect(Ty, /*ByVal=*/true);
+
+    return (isPromotableIntegerTypeForABI(Ty) ? ABIArgInfo::getExtend(Ty)
+                                              : ABIArgInfo::getDirect());
+  }
+
+  if (CGCXXABI::RecordArgABI RAA = getRecordArgABI(Ty, getCXXABI())) {
+    return getNaturalAlignIndirect(Ty, RAA == CGCXXABI::RAA_DirectInMemory);
+  }
+
+  // Ignore empty records.
+  if (isEmptyRecord(getContext(), Ty, true))
+    return ABIArgInfo::getIgnore();
+
+  if (IsAAPCS_VFP) {
+    // Homogeneous Aggregates need to be expanded when we can fit the aggregate
+    // into VFP registers.
+    const Type *Base = nullptr;
+    uint64_t Members = 0;
+    if (isHomogeneousAggregate(Ty, Base, Members))
+      return classifyHomogeneousAggregate(Ty, Base, Members);
+  } else if (getABIKind() == ARMABIKind::AAPCS16_VFP) {
+    // WatchOS does have homogeneous aggregates. Note that we intentionally use
+    // this convention even for a variadic function: the backend will use GPRs
+    // if needed.
+    const Type *Base = nullptr;
+    uint64_t Members = 0;
+    if (isHomogeneousAggregate(Ty, Base, Members)) {
+      assert(Base && Members <= 4 && "unexpected homogeneous aggregate");
+      llvm::Type *Ty =
+          llvm::ArrayType::get(CGT.ConvertType(QualType(Base, 0)), Members);
+      return ABIArgInfo::getDirect(Ty, 0, nullptr, false);
+    }
+  }
+
+  if (getABIKind() == ARMABIKind::AAPCS16_VFP &&
+      getContext().getTypeSizeInChars(Ty) > CharUnits::fromQuantity(16)) {
+    // WatchOS is adopting the 64-bit AAPCS rule on composite types: if they're
+    // bigger than 128-bits, they get placed in space allocated by the caller,
+    // and a pointer is passed.
+    return ABIArgInfo::getIndirect(
+        CharUnits::fromQuantity(getContext().getTypeAlign(Ty) / 8), false);
+  }
+
+  // Support byval for ARM.
+  // The ABI alignment for APCS is 4-byte and for AAPCS at least 4-byte and at
+  // most 8-byte. We realign the indirect argument if type alignment is bigger
+  // than ABI alignment.
+  uint64_t ABIAlign = 4;
+  uint64_t TyAlign;
+  if (getABIKind() == ARMABIKind::AAPCS_VFP ||
+      getABIKind() == ARMABIKind::AAPCS) {
+    TyAlign = getContext().getTypeUnadjustedAlignInChars(Ty).getQuantity();
+    ABIAlign = std::clamp(TyAlign, (uint64_t)4, (uint64_t)8);
+  } else {
+    TyAlign = getContext().getTypeAlignInChars(Ty).getQuantity();
+  }
+  if (getContext().getTypeSizeInChars(Ty) > CharUnits::fromQuantity(64)) {
+    assert(getABIKind() != ARMABIKind::AAPCS16_VFP && "unexpected byval");
+    return ABIArgInfo::getIndirect(CharUnits::fromQuantity(ABIAlign),
+                                   /*ByVal=*/true,
+                                   /*Realign=*/TyAlign > ABIAlign);
+  }
+
+  // On RenderScript, coerce Aggregates <= 64 bytes to an integer array of
+  // same size and alignment.
+  if (getTarget().isRenderScriptTarget()) {
+    return coerceToIntArray(Ty, getContext(), getVMContext());
+  }
+
+  // Otherwise, pass by coercing to a structure of the appropriate size.
+  llvm::Type *ElemTy;
+  unsigned SizeRegs;
+  // FIXME: Try to match the types of the arguments more accurately where
+  // we can.
+  if (TyAlign <= 4) {
+    ElemTy = llvm::Type::getInt32Ty(getVMContext());
+    SizeRegs = (getContext().getTypeSize(Ty) + 31) / 32;
+  } else {
+    ElemTy = llvm::Type::getInt64Ty(getVMContext());
+    SizeRegs = (getContext().getTypeSize(Ty) + 63) / 64;
+  }
+
+  return ABIArgInfo::getDirect(llvm::ArrayType::get(ElemTy, SizeRegs));
+}
+
+static bool isIntegerLikeType(QualType Ty, ASTContext &Context,
+                              llvm::LLVMContext &VMContext) {
+  // APCS, C Language Calling Conventions, Non-Simple Return Values: A structure
+  // is called integer-like if its size is less than or equal to one word, and
+  // the offset of each of its addressable sub-fields is zero.
+
+  uint64_t Size = Context.getTypeSize(Ty);
+
+  // Check that the type fits in a word.
+  if (Size > 32)
+    return false;
+
+  // FIXME: Handle vector types!
+  if (Ty->isVectorType())
+    return false;
+
+  // Float types are never treated as "integer like".
+  if (Ty->isRealFloatingType())
+    return false;
+
+  // If this is a builtin or pointer type then it is ok.
+  if (Ty->getAs<BuiltinType>() || Ty->isPointerType())
+    return true;
+
+  // Small complex integer types are "integer like".
+  if (const ComplexType *CT = Ty->getAs<ComplexType>())
+    return isIntegerLikeType(CT->getElementType(), Context, VMContext);
+
+  // Single element and zero sized arrays should be allowed, by the definition
+  // above, but they are not.
+
+  // Otherwise, it must be a record type.
+  const RecordType *RT = Ty->getAs<RecordType>();
+  if (!RT)
+    return false;
+
+  // Ignore records with flexible arrays.
+  const RecordDecl *RD = RT->getDecl();
+  if (RD->hasFlexibleArrayMember())
+    return false;
+
+  // Check that all sub-fields are at offset 0, and are themselves "integer
+  // like".
+  const ASTRecordLayout &Layout = Context.getASTRecordLayout(RD);
+
+  bool HadField = false;
+  unsigned idx = 0;
+  for (RecordDecl::field_iterator i = RD->field_begin(), e = RD->field_end();
+       i != e; ++i, ++idx) {
+    const FieldDecl *FD = *i;
+
+    // Bit-fields are not addressable, we only need to verify they are "integer
+    // like". We still have to disallow a subsequent non-bitfield, for example:
+    //   struct { int : 0; int x }
+    // is non-integer like according to gcc.
+    if (FD->isBitField()) {
+      if (!RD->isUnion())
+        HadField = true;
+
+      if (!isIntegerLikeType(FD->getType(), Context, VMContext))
+        return false;
+
+      continue;
+    }
+
+    // Check if this field is at offset 0.
+    if (Layout.getFieldOffset(idx) != 0)
+      return false;
+
+    if (!isIntegerLikeType(FD->getType(), Context, VMContext))
+      return false;
+
+    // Only allow at most one field in a structure. This doesn't match the
+    // wording above, but follows gcc in situations with a field following an
+    // empty structure.
+    if (!RD->isUnion()) {
+      if (HadField)
+        return false;
+
+      HadField = true;
+    }
+  }
+
+  return true;
+}
+
+ABIArgInfo ARMABIInfo::classifyReturnType(QualType RetTy, bool isVariadic,
+                                          unsigned functionCallConv) const {
+
+  // Variadic functions should always marshal to the base standard.
+  bool IsAAPCS_VFP = !isVariadic && isEffectivelyAAPCS_VFP(functionCallConv,
+                                                           /* AAPCS16 */ true);
+
+  if (RetTy->isVoidType())
+    return ABIArgInfo::getIgnore();
+
+  if (const VectorType *VT = RetTy->getAs<VectorType>()) {
+    // Large vector types should be returned via memory.
+    if (getContext().getTypeSize(RetTy) > 128)
+      return getNaturalAlignIndirect(RetTy);
+    // TODO: FP16/BF16 vectors should be converted to integer vectors
+    // This check is similar  to isIllegalVectorType - refactor?
+    if ((!getTarget().hasLegalHalfType() &&
+         (VT->getElementType()->isFloat16Type() ||
+          VT->getElementType()->isHalfType())) ||
+        (IsFloatABISoftFP && VT->getElementType()->isBFloat16Type()))
+      return coerceIllegalVector(RetTy);
+  }
+
+  if (!isAggregateTypeForABI(RetTy)) {
+    // Treat an enum type as its underlying type.
+    if (const EnumType *EnumTy = RetTy->getAs<EnumType>())
+      RetTy = EnumTy->getDecl()->getIntegerType();
+
+    if (const auto *EIT = RetTy->getAs<BitIntType>())
+      if (EIT->getNumBits() > 64)
+        return getNaturalAlignIndirect(RetTy, /*ByVal=*/false);
+
+    return isPromotableIntegerTypeForABI(RetTy) ? ABIArgInfo::getExtend(RetTy)
+                                                : ABIArgInfo::getDirect();
+  }
+
+  // Are we following APCS?
+  if (getABIKind() == ARMABIKind::APCS) {
+    if (isEmptyRecord(getContext(), RetTy, false))
+      return ABIArgInfo::getIgnore();
+
+    // Complex types are all returned as packed integers.
+    //
+    // FIXME: Consider using 2 x vector types if the back end handles them
+    // correctly.
+    if (RetTy->isAnyComplexType())
+      return ABIArgInfo::getDirect(llvm::IntegerType::get(
+          getVMContext(), getContext().getTypeSize(RetTy)));
+
+    // Integer like structures are returned in r0.
+    if (isIntegerLikeType(RetTy, getContext(), getVMContext())) {
+      // Return in the smallest viable integer type.
+      uint64_t Size = getContext().getTypeSize(RetTy);
+      if (Size <= 8)
+        return ABIArgInfo::getDirect(llvm::Type::getInt8Ty(getVMContext()));
+      if (Size <= 16)
+        return ABIArgInfo::getDirect(llvm::Type::getInt16Ty(getVMContext()));
+      return ABIArgInfo::getDirect(llvm::Type::getInt32Ty(getVMContext()));
+    }
+
+    // Otherwise return in memory.
+    return getNaturalAlignIndirect(RetTy);
+  }
+
+  // Otherwise this is an AAPCS variant.
+
+  if (isEmptyRecord(getContext(), RetTy, true))
+    return ABIArgInfo::getIgnore();
+
+  // Check for homogeneous aggregates with AAPCS-VFP.
+  if (IsAAPCS_VFP) {
+    const Type *Base = nullptr;
+    uint64_t Members = 0;
+    if (isHomogeneousAggregate(RetTy, Base, Members))
+      return classifyHomogeneousAggregate(RetTy, Base, Members);
+  }
+
+  // Aggregates <= 4 bytes are returned in r0; other aggregates
+  // are returned indirectly.
+  uint64_t Size = getContext().getTypeSize(RetTy);
+  if (Size <= 32) {
+    // On RenderScript, coerce Aggregates <= 4 bytes to an integer array of
+    // same size and alignment.
+    if (getTarget().isRenderScriptTarget()) {
+      return coerceToIntArray(RetTy, getContext(), getVMContext());
+    }
+    if (getDataLayout().isBigEndian())
+      // Return in 32 bit integer integer type (as if loaded by LDR, AAPCS 5.4)
+      return ABIArgInfo::getDirect(llvm::Type::getInt32Ty(getVMContext()));
+
+    // Return in the smallest viable integer type.
+    if (Size <= 8)
+      return ABIArgInfo::getDirect(llvm::Type::getInt8Ty(getVMContext()));
+    if (Size <= 16)
+      return ABIArgInfo::getDirect(llvm::Type::getInt16Ty(getVMContext()));
+    return ABIArgInfo::getDirect(llvm::Type::getInt32Ty(getVMContext()));
+  } else if (Size <= 128 && getABIKind() == ARMABIKind::AAPCS16_VFP) {
+    llvm::Type *Int32Ty = llvm::Type::getInt32Ty(getVMContext());
+    llvm::Type *CoerceTy =
+        llvm::ArrayType::get(Int32Ty, llvm::alignTo(Size, 32) / 32);
+    return ABIArgInfo::getDirect(CoerceTy);
+  }
+
+  return getNaturalAlignIndirect(RetTy);
+}
+
+/// isIllegalVector - check whether Ty is an illegal vector type.
+bool ARMABIInfo::isIllegalVectorType(QualType Ty) const {
+  if (const VectorType *VT = Ty->getAs<VectorType>()) {
+    // On targets that don't support half, fp16 or bfloat, they are expanded
+    // into float, and we don't want the ABI to depend on whether or not they
+    // are supported in hardware. Thus return false to coerce vectors of these
+    // types into integer vectors.
+    // We do not depend on hasLegalHalfType for bfloat as it is a
+    // separate IR type.
+    if ((!getTarget().hasLegalHalfType() &&
+         (VT->getElementType()->isFloat16Type() ||
+          VT->getElementType()->isHalfType())) ||
+        (IsFloatABISoftFP && VT->getElementType()->isBFloat16Type()))
+      return true;
+    if (isAndroid()) {
+      // Android shipped using Clang 3.1, which supported a slightly different
+      // vector ABI. The primary differences were that 3-element vector types
+      // were legal, and so were sub 32-bit vectors (i.e. <2 x i8>). This path
+      // accepts that legacy behavior for Android only.
+      // Check whether VT is legal.
+      unsigned NumElements = VT->getNumElements();
+      // NumElements should be power of 2 or equal to 3.
+      if (!llvm::isPowerOf2_32(NumElements) && NumElements != 3)
+        return true;
+    } else {
+      // Check whether VT is legal.
+      unsigned NumElements = VT->getNumElements();
+      uint64_t Size = getContext().getTypeSize(VT);
+      // NumElements should be power of 2.
+      if (!llvm::isPowerOf2_32(NumElements))
+        return true;
+      // Size should be greater than 32 bits.
+      return Size <= 32;
+    }
+  }
+  return false;
+}
+
+/// Return true if a type contains any 16-bit floating point vectors
+bool ARMABIInfo::containsAnyFP16Vectors(QualType Ty) const {
+  if (const ConstantArrayType *AT = getContext().getAsConstantArrayType(Ty)) {
+    uint64_t NElements = AT->getSize().getZExtValue();
+    if (NElements == 0)
+      return false;
+    return containsAnyFP16Vectors(AT->getElementType());
+  } else if (const RecordType *RT = Ty->getAs<RecordType>()) {
+    const RecordDecl *RD = RT->getDecl();
+
+    // If this is a C++ record, check the bases first.
+    if (const CXXRecordDecl *CXXRD = dyn_cast<CXXRecordDecl>(RD))
+      if (llvm::any_of(CXXRD->bases(), [this](const CXXBaseSpecifier &B) {
+            return containsAnyFP16Vectors(B.getType());
+          }))
+        return true;
+
+    if (llvm::any_of(RD->fields(), [this](FieldDecl *FD) {
+          return FD && containsAnyFP16Vectors(FD->getType());
+        }))
+      return true;
+
+    return false;
+  } else {
+    if (const VectorType *VT = Ty->getAs<VectorType>())
+      return (VT->getElementType()->isFloat16Type() ||
+              VT->getElementType()->isBFloat16Type() ||
+              VT->getElementType()->isHalfType());
+    return false;
+  }
+}
+
+bool ARMSwiftABIInfo::isLegalVectorType(CharUnits VectorSize, llvm::Type *EltTy,
+                                        unsigned NumElts) const {
+  if (!llvm::isPowerOf2_32(NumElts))
+    return false;
+  unsigned size = CGT.getDataLayout().getTypeStoreSizeInBits(EltTy);
+  if (size > 64)
+    return false;
+  if (VectorSize.getQuantity() != 8 &&
+      (VectorSize.getQuantity() != 16 || NumElts == 1))
+    return false;
+  return true;
+}
+
+bool ARMABIInfo::isHomogeneousAggregateBaseType(QualType Ty) const {
+  // Homogeneous aggregates for AAPCS-VFP must have base types of float,
+  // double, or 64-bit or 128-bit vectors.
+  if (const BuiltinType *BT = Ty->getAs<BuiltinType>()) {
+    if (BT->getKind() == BuiltinType::Float ||
+        BT->getKind() == BuiltinType::Double ||
+        BT->getKind() == BuiltinType::LongDouble)
+      return true;
+  } else if (const VectorType *VT = Ty->getAs<VectorType>()) {
+    unsigned VecSize = getContext().getTypeSize(VT);
+    if (VecSize == 64 || VecSize == 128)
+      return true;
+  }
+  return false;
+}
+
+bool ARMABIInfo::isHomogeneousAggregateSmallEnough(const Type *Base,
+                                                   uint64_t Members) const {
+  return Members <= 4;
+}
+
+bool ARMABIInfo::isZeroLengthBitfieldPermittedInHomogeneousAggregate() const {
+  // AAPCS32 says that the rule for whether something is a homogeneous
+  // aggregate is applied to the output of the data layout decision. So
+  // anything that doesn't affect the data layout also does not affect
+  // homogeneity. In particular, zero-length bitfields don't stop a struct
+  // being homogeneous.
+  return true;
+}
+
+bool ARMABIInfo::isEffectivelyAAPCS_VFP(unsigned callConvention,
+                                        bool acceptHalf) const {
+  // Give precedence to user-specified calling conventions.
+  if (callConvention != llvm::CallingConv::C)
+    return (callConvention == llvm::CallingConv::ARM_AAPCS_VFP);
+  else
+    return (getABIKind() == ARMABIKind::AAPCS_VFP) ||
+           (acceptHalf && (getABIKind() == ARMABIKind::AAPCS16_VFP));
+}
+
+Address ARMABIInfo::EmitVAArg(CodeGenFunction &CGF, Address VAListAddr,
+                              QualType Ty) const {
+  CharUnits SlotSize = CharUnits::fromQuantity(4);
+
+  // Empty records are ignored for parameter passing purposes.
+  if (isEmptyRecord(getContext(), Ty, true)) {
+    VAListAddr = CGF.Builder.CreateElementBitCast(VAListAddr, CGF.Int8PtrTy);
+    auto *Load = CGF.Builder.CreateLoad(VAListAddr);
+    Address Addr = Address(Load, CGF.Int8Ty, SlotSize);
+    return CGF.Builder.CreateElementBitCast(Addr, CGF.ConvertTypeForMem(Ty));
+  }
+
+  CharUnits TySize = getContext().getTypeSizeInChars(Ty);
+  CharUnits TyAlignForABI = getContext().getTypeUnadjustedAlignInChars(Ty);
+
+  // Use indirect if size of the illegal vector is bigger than 16 bytes.
+  bool IsIndirect = false;
+  const Type *Base = nullptr;
+  uint64_t Members = 0;
+  if (TySize > CharUnits::fromQuantity(16) && isIllegalVectorType(Ty)) {
+    IsIndirect = true;
+
+    // ARMv7k passes structs bigger than 16 bytes indirectly, in space
+    // allocated by the caller.
+  } else if (TySize > CharUnits::fromQuantity(16) &&
+             getABIKind() == ARMABIKind::AAPCS16_VFP &&
+             !isHomogeneousAggregate(Ty, Base, Members)) {
+    IsIndirect = true;
+
+    // Otherwise, bound the type's ABI alignment.
+    // The ABI alignment for 64-bit or 128-bit vectors is 8 for AAPCS and 4 for
+    // APCS. For AAPCS, the ABI alignment is at least 4-byte and at most 8-byte.
+    // Our callers should be prepared to handle an under-aligned address.
+  } else if (getABIKind() == ARMABIKind::AAPCS_VFP ||
+             getABIKind() == ARMABIKind::AAPCS) {
+    TyAlignForABI = std::max(TyAlignForABI, CharUnits::fromQuantity(4));
+    TyAlignForABI = std::min(TyAlignForABI, CharUnits::fromQuantity(8));
+  } else if (getABIKind() == ARMABIKind::AAPCS16_VFP) {
+    // ARMv7k allows type alignment up to 16 bytes.
+    TyAlignForABI = std::max(TyAlignForABI, CharUnits::fromQuantity(4));
+    TyAlignForABI = std::min(TyAlignForABI, CharUnits::fromQuantity(16));
+  } else {
+    TyAlignForABI = CharUnits::fromQuantity(4);
+  }
+
+  TypeInfoChars TyInfo(TySize, TyAlignForABI, AlignRequirementKind::None);
+  return emitVoidPtrVAArg(CGF, VAListAddr, Ty, IsIndirect, TyInfo, SlotSize,
+                          /*AllowHigherAlign*/ true);
+}

clang/lib/CodeGen/Targets/AVR.h

+//===- AVR.h ----------------------------------------------------*- C++ -*-===//
+//
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
+//
+//===----------------------------------------------------------------------===//
+
+#ifndef LLVM_CLANG_LIB_CODEGEN_TARGETS_AVR_H
+#define LLVM_CLANG_LIB_CODEGEN_TARGETS_AVR_H
+
+#include "TargetInfo.h"
+
+namespace clang::CodeGen {
+
+class LLVM_LIBRARY_VISIBILITY AVRTargetCodeGenInfo : public TargetCodeGenInfo {
+public:
+  AVRTargetCodeGenInfo(CodeGenTypes &CGT, unsigned NPR, unsigned NRR);
+
+  LangAS getGlobalVarAddressSpace(CodeGenModule &CGM,
+                                  const VarDecl *D) const override;
+
+  void setTargetAttributes(const Decl *D, llvm::GlobalValue *GV,
+                           CodeGen::CodeGenModule &CGM) const override;
+};
+
+} // namespace clang::CodeGen
+
+#endif // LLVM_CLANG_LIB_CODEGEN_TARGETS_AVR_H

clang/lib/CodeGen/Targets/AVR.cpp

+//===- AVR.cpp ------------------------------------------------------------===//
+//
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
+//
+//===----------------------------------------------------------------------===//
+
+#include "AVR.h"
+#include "ABIInfoImpl.h"
+#include "clang/Basic/DiagnosticFrontend.h"
+
+using namespace clang;
+using namespace clang::CodeGen;
+
+//===----------------------------------------------------------------------===//
+// AVR ABI Implementation. Documented at
+// https://gcc.gnu.org/wiki/avr-gcc#Calling_Convention
+// https://gcc.gnu.org/wiki/avr-gcc#Reduced_Tiny
+//===----------------------------------------------------------------------===//
+
+namespace {
+class AVRABIInfo : public DefaultABIInfo {
+private:
+  // The total amount of registers can be used to pass parameters. It is 18 on
+  // AVR, or 6 on AVRTiny.
+  const unsigned ParamRegs;
+  // The total amount of registers can be used to pass return value. It is 8 on
+  // AVR, or 4 on AVRTiny.
+  const unsigned RetRegs;
+
+public:
+  AVRABIInfo(CodeGenTypes &CGT, unsigned NPR, unsigned NRR)
+      : DefaultABIInfo(CGT), ParamRegs(NPR), RetRegs(NRR) {}
+
+  ABIArgInfo classifyReturnType(QualType Ty, bool &LargeRet) const {
+    // On AVR, a return struct with size less than or equals to 8 bytes is
+    // returned directly via registers R18-R25. On AVRTiny, a return struct
+    // with size less than or equals to 4 bytes is returned directly via
+    // registers R22-R25.
+    if (isAggregateTypeForABI(Ty) &&
+        getContext().getTypeSize(Ty) <= RetRegs * 8)
+      return ABIArgInfo::getDirect();
+    // A return value (struct or scalar) with larger size is returned via a
+    // stack slot, along with a pointer as the function's implicit argument.
+    if (getContext().getTypeSize(Ty) > RetRegs * 8) {
+      LargeRet = true;
+      return getNaturalAlignIndirect(Ty);
+    }
+    // An i8 return value should not be extended to i16, since AVR has 8-bit
+    // registers.
+    if (Ty->isIntegralOrEnumerationType() && getContext().getTypeSize(Ty) <= 8)
+      return ABIArgInfo::getDirect();
+    // Otherwise we follow the default way which is compatible.
+    return DefaultABIInfo::classifyReturnType(Ty);
+  }
+
+  ABIArgInfo classifyArgumentType(QualType Ty, unsigned &NumRegs) const {
+    unsigned TySize = getContext().getTypeSize(Ty);
+
+    // An int8 type argument always costs two registers like an int16.
+    if (TySize == 8 && NumRegs >= 2) {
+      NumRegs -= 2;
+      return ABIArgInfo::getExtend(Ty);
+    }
+
+    // If the argument size is an odd number of bytes, round up the size
+    // to the next even number.
+    TySize = llvm::alignTo(TySize, 16);
+
+    // Any type including an array/struct type can be passed in rgisters,
+    // if there are enough registers left.
+    if (TySize <= NumRegs * 8) {
+      NumRegs -= TySize / 8;
+      return ABIArgInfo::getDirect();
+    }
+
+    // An argument is passed either completely in registers or completely in
+    // memory. Since there are not enough registers left, current argument
+    // and all other unprocessed arguments should be passed in memory.
+    // However we still need to return `ABIArgInfo::getDirect()` other than
+    // `ABIInfo::getNaturalAlignIndirect(Ty)`, otherwise an extra stack slot
+    // will be allocated, so the stack frame layout will be incompatible with
+    // avr-gcc.
+    NumRegs = 0;
+    return ABIArgInfo::getDirect();
+  }
+
+  void computeInfo(CGFunctionInfo &FI) const override {
+    // Decide the return type.
+    bool LargeRet = false;
+    if (!getCXXABI().classifyReturnType(FI))
+      FI.getReturnInfo() = classifyReturnType(FI.getReturnType(), LargeRet);
+
+    // Decide each argument type. The total number of registers can be used for
+    // arguments depends on several factors:
+    // 1. Arguments of varargs functions are passed on the stack. This applies
+    //    even to the named arguments. So no register can be used.
+    // 2. Total 18 registers can be used on avr and 6 ones on avrtiny.
+    // 3. If the return type is a struct with too large size, two registers
+    //    (out of 18/6) will be cost as an implicit pointer argument.
+    unsigned NumRegs = ParamRegs;
+    if (FI.isVariadic())
+      NumRegs = 0;
+    else if (LargeRet)
+      NumRegs -= 2;
+    for (auto &I : FI.arguments())
+      I.info = classifyArgumentType(I.type, NumRegs);
+  }
+};
+
+} // namespace
+
+AVRTargetCodeGenInfo::AVRTargetCodeGenInfo(CodeGenTypes &CGT, unsigned NPR,
+                                           unsigned NRR)
+    : TargetCodeGenInfo(std::make_unique<AVRABIInfo>(CGT, NPR, NRR)) {}
+
+LangAS AVRTargetCodeGenInfo::getGlobalVarAddressSpace(CodeGenModule &CGM,
+                                                      const VarDecl *D) const {
+  // Check if global/static variable is defined in address space
+  // 1~6 (__flash, __flash1, __flash2, __flash3, __flash4, __flash5)
+  // but not constant.
+  if (D) {
+    LangAS AS = D->getType().getAddressSpace();
+    if (isTargetAddressSpace(AS) && 1 <= toTargetAddressSpace(AS) &&
+        toTargetAddressSpace(AS) <= 6 && !D->getType().isConstQualified())
+      CGM.getDiags().Report(D->getLocation(),
+                            diag::err_verify_nonconst_addrspace)
+          << "__flash*";
+  }
+  return TargetCodeGenInfo::getGlobalVarAddressSpace(CGM, D);
+}
+
+void AVRTargetCodeGenInfo::setTargetAttributes(const Decl *D,
+                                               llvm::GlobalValue *GV,
+                                               CodeGenModule &CGM) const {
+  if (GV->isDeclaration())
+    return;
+  const auto *FD = dyn_cast_or_null<FunctionDecl>(D);
+  if (!FD)
+    return;
+  auto *Fn = cast<llvm::Function>(GV);
+
+  if (FD->getAttr<AVRInterruptAttr>())
+    Fn->addFnAttr("interrupt");
+
+  if (FD->getAttr<AVRSignalAttr>())
+    Fn->addFnAttr("signal");
+}

clang/lib/CodeGen/Targets/BPF.h

+//===- BPF.h ----------------------------------------------------*- C++ -*-===//
+//
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
+//
+//===----------------------------------------------------------------------===//
+
+#ifndef LLVM_CLANG_LIB_CODEGEN_TARGETS_BPF_H
+#define LLVM_CLANG_LIB_CODEGEN_TARGETS_BPF_H
+
+#include "TargetInfo.h"
+
+namespace clang::CodeGen {
+
+class LLVM_LIBRARY_VISIBILITY BPFTargetCodeGenInfo : public TargetCodeGenInfo {
+public:
+  BPFTargetCodeGenInfo(CodeGenTypes &CGT);
+};
+
+} // namespace clang::CodeGen
+
+#endif // LLVM_CLANG_LIB_CODEGEN_TARGETS_BPF_H

clang/lib/CodeGen/Targets/BPF.cpp

+//===- BPF.cpp ------------------------------------------------------------===//
+//
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
+//
+//===----------------------------------------------------------------------===//
+
+#include "BPF.h"
+#include "ABIInfoImpl.h"
+
+using namespace clang;
+using namespace clang::CodeGen;
+
+//===----------------------------------------------------------------------===//
+// BPF ABI Implementation
+//===----------------------------------------------------------------------===//
+
+namespace {
+
+class BPFABIInfo : public DefaultABIInfo {
+public:
+  BPFABIInfo(CodeGenTypes &CGT) : DefaultABIInfo(CGT) {}
+
+  ABIArgInfo classifyArgumentType(QualType Ty) const {
+    Ty = useFirstFieldIfTransparentUnion(Ty);
+
+    if (isAggregateTypeForABI(Ty)) {
+      uint64_t Bits = getContext().getTypeSize(Ty);
+      if (Bits == 0)
+        return ABIArgInfo::getIgnore();
+
+      // If the aggregate needs 1 or 2 registers, do not use reference.
+      if (Bits <= 128) {
+        llvm::Type *CoerceTy;
+        if (Bits <= 64) {
+          CoerceTy =
+              llvm::IntegerType::get(getVMContext(), llvm::alignTo(Bits, 8));
+        } else {
+          llvm::Type *RegTy = llvm::IntegerType::get(getVMContext(), 64);
+          CoerceTy = llvm::ArrayType::get(RegTy, 2);
+        }
+        return ABIArgInfo::getDirect(CoerceTy);
+      } else {
+        return getNaturalAlignIndirect(Ty);
+      }
+    }
+
+    if (const EnumType *EnumTy = Ty->getAs<EnumType>())
+      Ty = EnumTy->getDecl()->getIntegerType();
+
+    ASTContext &Context = getContext();
+    if (const auto *EIT = Ty->getAs<BitIntType>())
+      if (EIT->getNumBits() > Context.getTypeSize(Context.Int128Ty))
+        return getNaturalAlignIndirect(Ty);
+
+    return (isPromotableIntegerTypeForABI(Ty) ? ABIArgInfo::getExtend(Ty)
+                                              : ABIArgInfo::getDirect());
+  }
+
+  ABIArgInfo classifyReturnType(QualType RetTy) const {
+    if (RetTy->isVoidType())
+      return ABIArgInfo::getIgnore();
+
+    if (isAggregateTypeForABI(RetTy))
+      return getNaturalAlignIndirect(RetTy);
+
+    // Treat an enum type as its underlying type.
+    if (const EnumType *EnumTy = RetTy->getAs<EnumType>())
+      RetTy = EnumTy->getDecl()->getIntegerType();
+
+    ASTContext &Context = getContext();
+    if (const auto *EIT = RetTy->getAs<BitIntType>())
+      if (EIT->getNumBits() > Context.getTypeSize(Context.Int128Ty))
+        return getNaturalAlignIndirect(RetTy);
+
+    // Caller will do necessary sign/zero extension.
+    return ABIArgInfo::getDirect();
+  }
+
+  void computeInfo(CGFunctionInfo &FI) const override {
+    FI.getReturnInfo() = classifyReturnType(FI.getReturnType());
+    for (auto &I : FI.arguments())
+      I.info = classifyArgumentType(I.type);
+  }
+};
+
+} // namespace
+
+BPFTargetCodeGenInfo::BPFTargetCodeGenInfo(CodeGenTypes &CGT)
+    : TargetCodeGenInfo(std::make_unique<BPFABIInfo>(CGT)) {}

clang/lib/CodeGen/Targets/CSKY.h

+//===- CSKY.h ---------------------------------------------------*- C++ -*-===//
+//
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
+//
+//===----------------------------------------------------------------------===//
+
+#ifndef LLVM_CLANG_LIB_CODEGEN_TARGETS_CSKY_H
+#define LLVM_CLANG_LIB_CODEGEN_TARGETS_CSKY_H
+
+#include "TargetInfo.h"
+
+namespace clang::CodeGen {
+
+class LLVM_LIBRARY_VISIBILITY CSKYTargetCodeGenInfo : public TargetCodeGenInfo {
+public:
+  CSKYTargetCodeGenInfo(CodeGen::CodeGenTypes &CGT, unsigned FLen);
+};
+
+} // namespace clang::CodeGen
+
+#endif // LLVM_CLANG_LIB_CODEGEN_TARGETS_CSKY_H

clang/lib/CodeGen/Targets/CSKY.cpp

+//===- CSKY.cpp -----------------------------------------------------------===//
+//
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
+//
+//===----------------------------------------------------------------------===//
+
+#include "CSKY.h"
+#include "ABIInfoImpl.h"
+
+using namespace clang;
+using namespace clang::CodeGen;
+
+//===----------------------------------------------------------------------===//
+// CSKY ABI Implementation
+//===----------------------------------------------------------------------===//
+namespace {
+class CSKYABIInfo : public DefaultABIInfo {
+  static const int NumArgGPRs = 4;
+  static const int NumArgFPRs = 4;
+
+  static const unsigned XLen = 32;
+  unsigned FLen;
+
+public:
+  CSKYABIInfo(CodeGen::CodeGenTypes &CGT, unsigned FLen)
+      : DefaultABIInfo(CGT), FLen(FLen) {}
+
+  void computeInfo(CGFunctionInfo &FI) const override;
+  ABIArgInfo classifyArgumentType(QualType Ty, int &ArgGPRsLeft,
+                                  int &ArgFPRsLeft,
+                                  bool isReturnType = false) const;
+  ABIArgInfo classifyReturnType(QualType RetTy) const;
+
+  Address EmitVAArg(CodeGenFunction &CGF, Address VAListAddr,
+                    QualType Ty) const override;
+};
+
+} // end anonymous namespace
+
+void CSKYABIInfo::computeInfo(CGFunctionInfo &FI) const {
+  QualType RetTy = FI.getReturnType();
+  if (!getCXXABI().classifyReturnType(FI))
+    FI.getReturnInfo() = classifyReturnType(RetTy);
+
+  bool IsRetIndirect = FI.getReturnInfo().getKind() == ABIArgInfo::Indirect;
+
+  // We must track the number of GPRs used in order to conform to the CSKY
+  // ABI, as integer scalars passed in registers should have signext/zeroext
+  // when promoted.
+  int ArgGPRsLeft = IsRetIndirect ? NumArgGPRs - 1 : NumArgGPRs;
+  int ArgFPRsLeft = FLen ? NumArgFPRs : 0;
+
+  for (auto &ArgInfo : FI.arguments()) {
+    ArgInfo.info = classifyArgumentType(ArgInfo.type, ArgGPRsLeft, ArgFPRsLeft);
+  }
+}
+
+Address CSKYABIInfo::EmitVAArg(CodeGenFunction &CGF, Address VAListAddr,
+                               QualType Ty) const {
+  CharUnits SlotSize = CharUnits::fromQuantity(XLen / 8);
+
+  // Empty records are ignored for parameter passing purposes.
+  if (isEmptyRecord(getContext(), Ty, true)) {
+    Address Addr = Address(CGF.Builder.CreateLoad(VAListAddr),
+                           getVAListElementType(CGF), SlotSize);
+    Addr = CGF.Builder.CreateElementBitCast(Addr, CGF.ConvertTypeForMem(Ty));
+    return Addr;
+  }
+
+  auto TInfo = getContext().getTypeInfoInChars(Ty);
+
+  return emitVoidPtrVAArg(CGF, VAListAddr, Ty, false, TInfo, SlotSize,
+                          /*AllowHigherAlign=*/true);
+}
+
+ABIArgInfo CSKYABIInfo::classifyArgumentType(QualType Ty, int &ArgGPRsLeft,
+                                             int &ArgFPRsLeft,
+                                             bool isReturnType) const {
+  assert(ArgGPRsLeft <= NumArgGPRs && "Arg GPR tracking underflow");
+  Ty = useFirstFieldIfTransparentUnion(Ty);
+
+  // Structures with either a non-trivial destructor or a non-trivial
+  // copy constructor are always passed indirectly.
+  if (CGCXXABI::RecordArgABI RAA = getRecordArgABI(Ty, getCXXABI())) {
+    if (ArgGPRsLeft)
+      ArgGPRsLeft -= 1;
+    return getNaturalAlignIndirect(Ty, /*ByVal=*/RAA ==
+                                           CGCXXABI::RAA_DirectInMemory);
+  }
+
+  // Ignore empty structs/unions.
+  if (isEmptyRecord(getContext(), Ty, true))
+    return ABIArgInfo::getIgnore();
+
+  if (!Ty->getAsUnionType())
+    if (const Type *SeltTy = isSingleElementStruct(Ty, getContext()))
+      return ABIArgInfo::getDirect(CGT.ConvertType(QualType(SeltTy, 0)));
+
+  uint64_t Size = getContext().getTypeSize(Ty);
+  // Pass floating point values via FPRs if possible.
+  if (Ty->isFloatingType() && !Ty->isComplexType() && FLen >= Size &&
+      ArgFPRsLeft) {
+    ArgFPRsLeft--;
+    return ABIArgInfo::getDirect();
+  }
+
+  // Complex types for the hard float ABI must be passed direct rather than
+  // using CoerceAndExpand.
+  if (Ty->isComplexType() && FLen && !isReturnType) {
+    QualType EltTy = Ty->castAs<ComplexType>()->getElementType();
+    if (getContext().getTypeSize(EltTy) <= FLen) {
+      ArgFPRsLeft -= 2;
+      return ABIArgInfo::getDirect();
+    }
+  }
+
+  if (!isAggregateTypeForABI(Ty)) {
+    // Treat an enum type as its underlying type.
+    if (const EnumType *EnumTy = Ty->getAs<EnumType>())
+      Ty = EnumTy->getDecl()->getIntegerType();
+
+    // All integral types are promoted to XLen width, unless passed on the
+    // stack.
+    if (Size < XLen && Ty->isIntegralOrEnumerationType())
+      return ABIArgInfo::getExtend(Ty);
+
+    if (const auto *EIT = Ty->getAs<BitIntType>()) {
+      if (EIT->getNumBits() < XLen)
+        return ABIArgInfo::getExtend(Ty);
+    }
+
+    return ABIArgInfo::getDirect();
+  }
+
+  // For argument type, the first 4*XLen parts of aggregate will be passed
+  // in registers, and the rest will be passed in stack.
+  // So we can coerce to integers directly and let backend handle it correctly.
+  // For return type, aggregate which <= 2*XLen will be returned in registers.
+  // Otherwise, aggregate will be returned indirectly.
+  if (!isReturnType || (isReturnType && Size <= 2 * XLen)) {
+    if (Size <= XLen) {
+      return ABIArgInfo::getDirect(
+          llvm::IntegerType::get(getVMContext(), XLen));
+    } else {
+      return ABIArgInfo::getDirect(llvm::ArrayType::get(
+          llvm::IntegerType::get(getVMContext(), XLen), (Size + 31) / XLen));
+    }
+  }
+  return getNaturalAlignIndirect(Ty, /*ByVal=*/false);
+}
+
+ABIArgInfo CSKYABIInfo::classifyReturnType(QualType RetTy) const {
+  if (RetTy->isVoidType())
+    return ABIArgInfo::getIgnore();
+
+  int ArgGPRsLeft = 2;
+  int ArgFPRsLeft = FLen ? 1 : 0;
+
+  // The rules for return and argument types are the same, so defer to
+  // classifyArgumentType.
+  return classifyArgumentType(RetTy, ArgGPRsLeft, ArgFPRsLeft, true);
+}
+
+CSKYTargetCodeGenInfo::CSKYTargetCodeGenInfo(CodeGenTypes &CGT, unsigned FLen)
+    : TargetCodeGenInfo(std::make_unique<CSKYABIInfo>(CGT, FLen)) {}

clang/lib/CodeGen/Targets/Hexagon.h

+//===- Hexagon.h ------------------------------------------------*- C++ -*-===//
+//
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
+//
+//===----------------------------------------------------------------------===//
+
+#ifndef LLVM_CLANG_LIB_CODEGEN_TARGETS_HEXAGON_H
+#define LLVM_CLANG_LIB_CODEGEN_TARGETS_HEXAGON_H
+
+#include "TargetInfo.h"
+
+namespace clang::CodeGen {
+
+class LLVM_LIBRARY_VISIBILITY HexagonTargetCodeGenInfo
+    : public TargetCodeGenInfo {
+public:
+  HexagonTargetCodeGenInfo(CodeGenTypes &CGT);
+
+  int getDwarfEHStackPointer(CodeGen::CodeGenModule &M) const override {
+    return 29;
+  }
+
+  void setTargetAttributes(const Decl *D, llvm::GlobalValue *GV,
+                           CodeGen::CodeGenModule &GCM) const override;
+};
+
+} // namespace clang::CodeGen
+
+#endif // LLVM_CLANG_LIB_CODEGEN_TARGETS_HEXAGON_H

clang/lib/CodeGen/Targets/Hexagon.cpp

+//===- Hexagon.cpp --------------------------------------------------------===//
+//
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
+//
+//===----------------------------------------------------------------------===//
+
+#include "Hexagon.h"
+#include "ABIInfoImpl.h"
+
+using namespace clang;
+using namespace clang::CodeGen;
+
+//===----------------------------------------------------------------------===//
+// Hexagon ABI Implementation
+//===----------------------------------------------------------------------===//
+
+namespace {
+
+class HexagonABIInfo : public DefaultABIInfo {
+public:
+  HexagonABIInfo(CodeGenTypes &CGT) : DefaultABIInfo(CGT) {}
+
+private:
+  ABIArgInfo classifyReturnType(QualType RetTy) const;
+  ABIArgInfo classifyArgumentType(QualType RetTy) const;
+  ABIArgInfo classifyArgumentType(QualType RetTy, unsigned *RegsLeft) const;
+
+  void computeInfo(CGFunctionInfo &FI) const override;
+
+  Address EmitVAArg(CodeGenFunction &CGF, Address VAListAddr,
+                    QualType Ty) const override;
+  Address EmitVAArgFromMemory(CodeGenFunction &CFG, Address VAListAddr,
+                              QualType Ty) const;
+  Address EmitVAArgForHexagon(CodeGenFunction &CFG, Address VAListAddr,
+                              QualType Ty) const;
+  Address EmitVAArgForHexagonLinux(CodeGenFunction &CFG, Address VAListAddr,
+                                   QualType Ty) const;
+};
+
+} // namespace
+
+HexagonTargetCodeGenInfo::HexagonTargetCodeGenInfo(CodeGenTypes &CGT)
+    : TargetCodeGenInfo(std::make_unique<HexagonABIInfo>(CGT)) {}
+
+void HexagonTargetCodeGenInfo::setTargetAttributes(const Decl *D,
+                                                   llvm::GlobalValue *GV,
+                                                   CodeGenModule &GCM) const {
+  if (GV->isDeclaration())
+    return;
+  const FunctionDecl *FD = dyn_cast_or_null<FunctionDecl>(D);
+  if (!FD)
+    return;
+}
+
+void HexagonABIInfo::computeInfo(CGFunctionInfo &FI) const {
+  unsigned RegsLeft = 6;
+  if (!getCXXABI().classifyReturnType(FI))
+    FI.getReturnInfo() = classifyReturnType(FI.getReturnType());
+  for (auto &I : FI.arguments())
+    I.info = classifyArgumentType(I.type, &RegsLeft);
+}
+
+static bool HexagonAdjustRegsLeft(uint64_t Size, unsigned *RegsLeft) {
+  assert(Size <= 64 && "Not expecting to pass arguments larger than 64 bits"
+                       " through registers");
+
+  if (*RegsLeft == 0)
+    return false;
+
+  if (Size <= 32) {
+    (*RegsLeft)--;
+    return true;
+  }
+
+  if (2 <= (*RegsLeft & (~1U))) {
+    *RegsLeft = (*RegsLeft & (~1U)) - 2;
+    return true;
+  }
+
+  // Next available register was r5 but candidate was greater than 32-bits so it
+  // has to go on the stack. However we still consume r5
+  if (*RegsLeft == 1)
+    *RegsLeft = 0;
+
+  return false;
+}
+
+ABIArgInfo HexagonABIInfo::classifyArgumentType(QualType Ty,
+                                                unsigned *RegsLeft) const {
+  if (!isAggregateTypeForABI(Ty)) {
+    // Treat an enum type as its underlying type.
+    if (const EnumType *EnumTy = Ty->getAs<EnumType>())
+      Ty = EnumTy->getDecl()->getIntegerType();
+
+    uint64_t Size = getContext().getTypeSize(Ty);
+    if (Size <= 64)
+      HexagonAdjustRegsLeft(Size, RegsLeft);
+
+    if (Size > 64 && Ty->isBitIntType())
+      return getNaturalAlignIndirect(Ty, /*ByVal=*/true);
+
+    return isPromotableIntegerTypeForABI(Ty) ? ABIArgInfo::getExtend(Ty)
+                                             : ABIArgInfo::getDirect();
+  }
+
+  if (CGCXXABI::RecordArgABI RAA = getRecordArgABI(Ty, getCXXABI()))
+    return getNaturalAlignIndirect(Ty, RAA == CGCXXABI::RAA_DirectInMemory);
+
+  // Ignore empty records.
+  if (isEmptyRecord(getContext(), Ty, true))
+    return ABIArgInfo::getIgnore();
+
+  uint64_t Size = getContext().getTypeSize(Ty);
+  unsigned Align = getContext().getTypeAlign(Ty);
+
+  if (Size > 64)
+    return getNaturalAlignIndirect(Ty, /*ByVal=*/true);
+
+  if (HexagonAdjustRegsLeft(Size, RegsLeft))
+    Align = Size <= 32 ? 32 : 64;
+  if (Size <= Align) {
+    // Pass in the smallest viable integer type.
+    Size = llvm::bit_ceil(Size);
+    return ABIArgInfo::getDirect(llvm::Type::getIntNTy(getVMContext(), Size));
+  }
+  return DefaultABIInfo::classifyArgumentType(Ty);
+}
+
+ABIArgInfo HexagonABIInfo::classifyReturnType(QualType RetTy) const {
+  if (RetTy->isVoidType())
+    return ABIArgInfo::getIgnore();
+
+  const TargetInfo &T = CGT.getTarget();
+  uint64_t Size = getContext().getTypeSize(RetTy);
+
+  if (RetTy->getAs<VectorType>()) {
+    // HVX vectors are returned in vector registers or register pairs.
+    if (T.hasFeature("hvx")) {
+      assert(T.hasFeature("hvx-length64b") || T.hasFeature("hvx-length128b"));
+      uint64_t VecSize = T.hasFeature("hvx-length64b") ? 64 * 8 : 128 * 8;
+      if (Size == VecSize || Size == 2 * VecSize)
+        return ABIArgInfo::getDirectInReg();
+    }
+    // Large vector types should be returned via memory.
+    if (Size > 64)
+      return getNaturalAlignIndirect(RetTy);
+  }
+
+  if (!isAggregateTypeForABI(RetTy)) {
+    // Treat an enum type as its underlying type.
+    if (const EnumType *EnumTy = RetTy->getAs<EnumType>())
+      RetTy = EnumTy->getDecl()->getIntegerType();
+
+    if (Size > 64 && RetTy->isBitIntType())
+      return getNaturalAlignIndirect(RetTy, /*ByVal=*/false);
+
+    return isPromotableIntegerTypeForABI(RetTy) ? ABIArgInfo::getExtend(RetTy)
+                                                : ABIArgInfo::getDirect();
+  }
+
+  if (isEmptyRecord(getContext(), RetTy, true))
+    return ABIArgInfo::getIgnore();
+
+  // Aggregates <= 8 bytes are returned in registers, other aggregates
+  // are returned indirectly.
+  if (Size <= 64) {
+    // Return in the smallest viable integer type.
+    Size = llvm::bit_ceil(Size);
+    return ABIArgInfo::getDirect(llvm::Type::getIntNTy(getVMContext(), Size));
+  }
+  return getNaturalAlignIndirect(RetTy, /*ByVal=*/true);
+}
+
+Address HexagonABIInfo::EmitVAArgFromMemory(CodeGenFunction &CGF,
+                                            Address VAListAddr,
+                                            QualType Ty) const {
+  // Load the overflow area pointer.
+  Address __overflow_area_pointer_p =
+      CGF.Builder.CreateStructGEP(VAListAddr, 2, "__overflow_area_pointer_p");
+  llvm::Value *__overflow_area_pointer = CGF.Builder.CreateLoad(
+      __overflow_area_pointer_p, "__overflow_area_pointer");
+
+  uint64_t Align = CGF.getContext().getTypeAlign(Ty) / 8;
+  if (Align > 4) {
+    // Alignment should be a power of 2.
+    assert((Align & (Align - 1)) == 0 && "Alignment is not power of 2!");
+
+    // overflow_arg_area = (overflow_arg_area + align - 1) & -align;
+    llvm::Value *Offset = llvm::ConstantInt::get(CGF.Int64Ty, Align - 1);
+
+    // Add offset to the current pointer to access the argument.
+    __overflow_area_pointer =
+        CGF.Builder.CreateGEP(CGF.Int8Ty, __overflow_area_pointer, Offset);
+    llvm::Value *AsInt =
+        CGF.Builder.CreatePtrToInt(__overflow_area_pointer, CGF.Int32Ty);
+
+    // Create a mask which should be "AND"ed
+    // with (overflow_arg_area + align - 1)
+    llvm::Value *Mask = llvm::ConstantInt::get(CGF.Int32Ty, -(int)Align);
+    __overflow_area_pointer = CGF.Builder.CreateIntToPtr(
+        CGF.Builder.CreateAnd(AsInt, Mask), __overflow_area_pointer->getType(),
+        "__overflow_area_pointer.align");
+  }
+
+  // Get the type of the argument from memory and bitcast
+  // overflow area pointer to the argument type.
+  llvm::Type *PTy = CGF.ConvertTypeForMem(Ty);
+  Address AddrTyped = CGF.Builder.CreateElementBitCast(
+      Address(__overflow_area_pointer, CGF.Int8Ty,
+              CharUnits::fromQuantity(Align)),
+      PTy);
+
+  // Round up to the minimum stack alignment for varargs which is 4 bytes.
+  uint64_t Offset = llvm::alignTo(CGF.getContext().getTypeSize(Ty) / 8, 4);
+
+  __overflow_area_pointer =
+      CGF.Builder.CreateGEP(CGF.Int8Ty, __overflow_area_pointer,
+                            llvm::ConstantInt::get(CGF.Int32Ty, Offset),
+                            "__overflow_area_pointer.next");
+  CGF.Builder.CreateStore(__overflow_area_pointer, __overflow_area_pointer_p);
+
+  return AddrTyped;
+}
+
+Address HexagonABIInfo::EmitVAArgForHexagon(CodeGenFunction &CGF,
+                                            Address VAListAddr,
+                                            QualType Ty) const {
+  // FIXME: Need to handle alignment
+  llvm::Type *BP = CGF.Int8PtrTy;
+  CGBuilderTy &Builder = CGF.Builder;
+  Address VAListAddrAsBPP = Builder.CreateElementBitCast(VAListAddr, BP, "ap");
+  llvm::Value *Addr = Builder.CreateLoad(VAListAddrAsBPP, "ap.cur");
+  // Handle address alignment for type alignment > 32 bits
+  uint64_t TyAlign = CGF.getContext().getTypeAlign(Ty) / 8;
+  if (TyAlign > 4) {
+    assert((TyAlign & (TyAlign - 1)) == 0 && "Alignment is not power of 2!");
+    llvm::Value *AddrAsInt = Builder.CreatePtrToInt(Addr, CGF.Int32Ty);
+    AddrAsInt = Builder.CreateAdd(AddrAsInt, Builder.getInt32(TyAlign - 1));
+    AddrAsInt = Builder.CreateAnd(AddrAsInt, Builder.getInt32(~(TyAlign - 1)));
+    Addr = Builder.CreateIntToPtr(AddrAsInt, BP);
+  }
+  Address AddrTyped = Builder.CreateElementBitCast(
+      Address(Addr, CGF.Int8Ty, CharUnits::fromQuantity(TyAlign)),
+      CGF.ConvertType(Ty));
+
+  uint64_t Offset = llvm::alignTo(CGF.getContext().getTypeSize(Ty) / 8, 4);
+  llvm::Value *NextAddr = Builder.CreateGEP(
+      CGF.Int8Ty, Addr, llvm::ConstantInt::get(CGF.Int32Ty, Offset), "ap.next");
+  Builder.CreateStore(NextAddr, VAListAddrAsBPP);
+
+  return AddrTyped;
+}
+
+Address HexagonABIInfo::EmitVAArgForHexagonLinux(CodeGenFunction &CGF,
+                                                 Address VAListAddr,
+                                                 QualType Ty) const {
+  int ArgSize = CGF.getContext().getTypeSize(Ty) / 8;
+
+  if (ArgSize > 8)
+    return EmitVAArgFromMemory(CGF, VAListAddr, Ty);
+
+  // Here we have check if the argument is in register area or
+  // in overflow area.
+  // If the saved register area pointer + argsize rounded up to alignment >
+  // saved register area end pointer, argument is in overflow area.
+  unsigned RegsLeft = 6;
+  Ty = CGF.getContext().getCanonicalType(Ty);
+  (void)classifyArgumentType(Ty, &RegsLeft);
+
+  llvm::BasicBlock *MaybeRegBlock = CGF.createBasicBlock("vaarg.maybe_reg");
+  llvm::BasicBlock *InRegBlock = CGF.createBasicBlock("vaarg.in_reg");
+  llvm::BasicBlock *OnStackBlock = CGF.createBasicBlock("vaarg.on_stack");
+  llvm::BasicBlock *ContBlock = CGF.createBasicBlock("vaarg.end");
+
+  // Get rounded size of the argument.GCC does not allow vararg of
+  // size < 4 bytes. We follow the same logic here.
+  ArgSize = (CGF.getContext().getTypeSize(Ty) <= 32) ? 4 : 8;
+  int ArgAlign = (CGF.getContext().getTypeSize(Ty) <= 32) ? 4 : 8;
+
+  // Argument may be in saved register area
+  CGF.EmitBlock(MaybeRegBlock);
+
+  // Load the current saved register area pointer.
+  Address __current_saved_reg_area_pointer_p = CGF.Builder.CreateStructGEP(
+      VAListAddr, 0, "__current_saved_reg_area_pointer_p");
+  llvm::Value *__current_saved_reg_area_pointer = CGF.Builder.CreateLoad(
+      __current_saved_reg_area_pointer_p, "__current_saved_reg_area_pointer");
+
+  // Load the saved register area end pointer.
+  Address __saved_reg_area_end_pointer_p = CGF.Builder.CreateStructGEP(
+      VAListAddr, 1, "__saved_reg_area_end_pointer_p");
+  llvm::Value *__saved_reg_area_end_pointer = CGF.Builder.CreateLoad(
+      __saved_reg_area_end_pointer_p, "__saved_reg_area_end_pointer");
+
+  // If the size of argument is > 4 bytes, check if the stack
+  // location is aligned to 8 bytes
+  if (ArgAlign > 4) {
+
+    llvm::Value *__current_saved_reg_area_pointer_int =
+        CGF.Builder.CreatePtrToInt(__current_saved_reg_area_pointer,
+                                   CGF.Int32Ty);
+
+    __current_saved_reg_area_pointer_int = CGF.Builder.CreateAdd(
+        __current_saved_reg_area_pointer_int,
+        llvm::ConstantInt::get(CGF.Int32Ty, (ArgAlign - 1)),
+        "align_current_saved_reg_area_pointer");
+
+    __current_saved_reg_area_pointer_int =
+        CGF.Builder.CreateAnd(__current_saved_reg_area_pointer_int,
+                              llvm::ConstantInt::get(CGF.Int32Ty, -ArgAlign),
+                              "align_current_saved_reg_area_pointer");
+
+    __current_saved_reg_area_pointer =
+        CGF.Builder.CreateIntToPtr(__current_saved_reg_area_pointer_int,
+                                   __current_saved_reg_area_pointer->getType(),
+                                   "align_current_saved_reg_area_pointer");
+  }
+
+  llvm::Value *__new_saved_reg_area_pointer =
+      CGF.Builder.CreateGEP(CGF.Int8Ty, __current_saved_reg_area_pointer,
+                            llvm::ConstantInt::get(CGF.Int32Ty, ArgSize),
+                            "__new_saved_reg_area_pointer");
+
+  llvm::Value *UsingStack = nullptr;
+  UsingStack = CGF.Builder.CreateICmpSGT(__new_saved_reg_area_pointer,
+                                         __saved_reg_area_end_pointer);
+
+  CGF.Builder.CreateCondBr(UsingStack, OnStackBlock, InRegBlock);
+
+  // Argument in saved register area
+  // Implement the block where argument is in register saved area
+  CGF.EmitBlock(InRegBlock);
+
+  llvm::Type *PTy = CGF.ConvertType(Ty);
+  llvm::Value *__saved_reg_area_p = CGF.Builder.CreateBitCast(
+      __current_saved_reg_area_pointer, llvm::PointerType::getUnqual(PTy));
+
+  CGF.Builder.CreateStore(__new_saved_reg_area_pointer,
+                          __current_saved_reg_area_pointer_p);
+
+  CGF.EmitBranch(ContBlock);
+
+  // Argument in overflow area
+  // Implement the block where the argument is in overflow area.
+  CGF.EmitBlock(OnStackBlock);
+
+  // Load the overflow area pointer
+  Address __overflow_area_pointer_p =
+      CGF.Builder.CreateStructGEP(VAListAddr, 2, "__overflow_area_pointer_p");
+  llvm::Value *__overflow_area_pointer = CGF.Builder.CreateLoad(
+      __overflow_area_pointer_p, "__overflow_area_pointer");
+
+  // Align the overflow area pointer according to the alignment of the argument
+  if (ArgAlign > 4) {
+    llvm::Value *__overflow_area_pointer_int =
+        CGF.Builder.CreatePtrToInt(__overflow_area_pointer, CGF.Int32Ty);
+
+    __overflow_area_pointer_int =
+        CGF.Builder.CreateAdd(__overflow_area_pointer_int,
+                              llvm::ConstantInt::get(CGF.Int32Ty, ArgAlign - 1),
+                              "align_overflow_area_pointer");
+
+    __overflow_area_pointer_int =
+        CGF.Builder.CreateAnd(__overflow_area_pointer_int,
+                              llvm::ConstantInt::get(CGF.Int32Ty, -ArgAlign),
+                              "align_overflow_area_pointer");
+
+    __overflow_area_pointer = CGF.Builder.CreateIntToPtr(
+        __overflow_area_pointer_int, __overflow_area_pointer->getType(),
+        "align_overflow_area_pointer");
+  }
+
+  // Get the pointer for next argument in overflow area and store it
+  // to overflow area pointer.
+  llvm::Value *__new_overflow_area_pointer =
+      CGF.Builder.CreateGEP(CGF.Int8Ty, __overflow_area_pointer,
+                            llvm::ConstantInt::get(CGF.Int32Ty, ArgSize),
+                            "__overflow_area_pointer.next");
+
+  CGF.Builder.CreateStore(__new_overflow_area_pointer,
+                          __overflow_area_pointer_p);
+
+  CGF.Builder.CreateStore(__new_overflow_area_pointer,
+                          __current_saved_reg_area_pointer_p);
+
+  // Bitcast the overflow area pointer to the type of argument.
+  llvm::Type *OverflowPTy = CGF.ConvertTypeForMem(Ty);
+  llvm::Value *__overflow_area_p = CGF.Builder.CreateBitCast(
+      __overflow_area_pointer, llvm::PointerType::getUnqual(OverflowPTy));
+
+  CGF.EmitBranch(ContBlock);
+
+  // Get the correct pointer to load the variable argument
+  // Implement the ContBlock
+  CGF.EmitBlock(ContBlock);
+
+  llvm::Type *MemTy = CGF.ConvertTypeForMem(Ty);
+  llvm::Type *MemPTy = llvm::PointerType::getUnqual(MemTy);
+  llvm::PHINode *ArgAddr = CGF.Builder.CreatePHI(MemPTy, 2, "vaarg.addr");
+  ArgAddr->addIncoming(__saved_reg_area_p, InRegBlock);
+  ArgAddr->addIncoming(__overflow_area_p, OnStackBlock);
+
+  return Address(ArgAddr, MemTy, CharUnits::fromQuantity(ArgAlign));
+}
+
+Address HexagonABIInfo::EmitVAArg(CodeGenFunction &CGF, Address VAListAddr,
+                                  QualType Ty) const {
+
+  if (getTarget().getTriple().isMusl())
+    return EmitVAArgForHexagonLinux(CGF, VAListAddr, Ty);
+
+  return EmitVAArgForHexagon(CGF, VAListAddr, Ty);
+}

clang/lib/CodeGen/Targets/Lanai.h

+//===- Lanai.h --------------------------------------------------*- C++ -*-===//
+//
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
+//
+//===----------------------------------------------------------------------===//
+
+#ifndef LLVM_CLANG_LIB_CODEGEN_TARGETS_LANAI_H
+#define LLVM_CLANG_LIB_CODEGEN_TARGETS_LANAI_H
+
+#include "TargetInfo.h"
+
+namespace clang::CodeGen {
+
+class LLVM_LIBRARY_VISIBILITY LanaiTargetCodeGenInfo
+    : public TargetCodeGenInfo {
+public:
+  LanaiTargetCodeGenInfo(CodeGen::CodeGenTypes &CGT);
+};
+
+} // namespace clang::CodeGen
+
+#endif // LLVM_CLANG_LIB_CODEGEN_TARGETS_LANAI_H

clang/lib/CodeGen/Targets/Lanai.cpp

+//===- Lanai.cpp ----------------------------------------------------------===//
+//
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
+//
+//===----------------------------------------------------------------------===//
+
+#include "Lanai.h"
+#include "ABIInfoImpl.h"
+
+using namespace clang;
+using namespace clang::CodeGen;
+
+//===----------------------------------------------------------------------===//
+// Lanai ABI Implementation
+//===----------------------------------------------------------------------===//
+
+namespace {
+class LanaiABIInfo : public DefaultABIInfo {
+  struct CCState {
+    unsigned FreeRegs;
+  };
+
+public:
+  LanaiABIInfo(CodeGen::CodeGenTypes &CGT) : DefaultABIInfo(CGT) {}
+
+  bool shouldUseInReg(QualType Ty, CCState &State) const;
+
+  void computeInfo(CGFunctionInfo &FI) const override {
+    CCState State;
+    // Lanai uses 4 registers to pass arguments unless the function has the
+    // regparm attribute set.
+    if (FI.getHasRegParm()) {
+      State.FreeRegs = FI.getRegParm();
+    } else {
+      State.FreeRegs = 4;
+    }
+
+    if (!getCXXABI().classifyReturnType(FI))
+      FI.getReturnInfo() = classifyReturnType(FI.getReturnType());
+    for (auto &I : FI.arguments())
+      I.info = classifyArgumentType(I.type, State);
+  }
+
+  ABIArgInfo getIndirectResult(QualType Ty, bool ByVal, CCState &State) const;
+  ABIArgInfo classifyArgumentType(QualType RetTy, CCState &State) const;
+};
+} // end anonymous namespace
+
+bool LanaiABIInfo::shouldUseInReg(QualType Ty, CCState &State) const {
+  unsigned Size = getContext().getTypeSize(Ty);
+  unsigned SizeInRegs = llvm::alignTo(Size, 32U) / 32U;
+
+  if (SizeInRegs == 0)
+    return false;
+
+  if (SizeInRegs > State.FreeRegs) {
+    State.FreeRegs = 0;
+    return false;
+  }
+
+  State.FreeRegs -= SizeInRegs;
+
+  return true;
+}
+
+ABIArgInfo LanaiABIInfo::getIndirectResult(QualType Ty, bool ByVal,
+                                           CCState &State) const {
+  if (!ByVal) {
+    if (State.FreeRegs) {
+      --State.FreeRegs; // Non-byval indirects just use one pointer.
+      return getNaturalAlignIndirectInReg(Ty);
+    }
+    return getNaturalAlignIndirect(Ty, false);
+  }
+
+  // Compute the byval alignment.
+  const unsigned MinABIStackAlignInBytes = 4;
+  unsigned TypeAlign = getContext().getTypeAlign(Ty) / 8;
+  return ABIArgInfo::getIndirect(CharUnits::fromQuantity(4), /*ByVal=*/true,
+                                 /*Realign=*/TypeAlign >
+                                     MinABIStackAlignInBytes);
+}
+
+ABIArgInfo LanaiABIInfo::classifyArgumentType(QualType Ty,
+                                              CCState &State) const {
+  // Check with the C++ ABI first.
+  const RecordType *RT = Ty->getAs<RecordType>();
+  if (RT) {
+    CGCXXABI::RecordArgABI RAA = getRecordArgABI(RT, getCXXABI());
+    if (RAA == CGCXXABI::RAA_Indirect) {
+      return getIndirectResult(Ty, /*ByVal=*/false, State);
+    } else if (RAA == CGCXXABI::RAA_DirectInMemory) {
+      return getNaturalAlignIndirect(Ty, /*ByVal=*/true);
+    }
+  }
+
+  if (isAggregateTypeForABI(Ty)) {
+    // Structures with flexible arrays are always indirect.
+    if (RT && RT->getDecl()->hasFlexibleArrayMember())
+      return getIndirectResult(Ty, /*ByVal=*/true, State);
+
+    // Ignore empty structs/unions.
+    if (isEmptyRecord(getContext(), Ty, true))
+      return ABIArgInfo::getIgnore();
+
+    llvm::LLVMContext &LLVMContext = getVMContext();
+    unsigned SizeInRegs = (getContext().getTypeSize(Ty) + 31) / 32;
+    if (SizeInRegs <= State.FreeRegs) {
+      llvm::IntegerType *Int32 = llvm::Type::getInt32Ty(LLVMContext);
+      SmallVector<llvm::Type *, 3> Elements(SizeInRegs, Int32);
+      llvm::Type *Result = llvm::StructType::get(LLVMContext, Elements);
+      State.FreeRegs -= SizeInRegs;
+      return ABIArgInfo::getDirectInReg(Result);
+    } else {
+      State.FreeRegs = 0;
+    }
+    return getIndirectResult(Ty, true, State);
+  }
+
+  // Treat an enum type as its underlying type.
+  if (const auto *EnumTy = Ty->getAs<EnumType>())
+    Ty = EnumTy->getDecl()->getIntegerType();
+
+  bool InReg = shouldUseInReg(Ty, State);
+
+  // Don't pass >64 bit integers in registers.
+  if (const auto *EIT = Ty->getAs<BitIntType>())
+    if (EIT->getNumBits() > 64)
+      return getIndirectResult(Ty, /*ByVal=*/true, State);
+
+  if (isPromotableIntegerTypeForABI(Ty)) {
+    if (InReg)
+      return ABIArgInfo::getDirectInReg();
+    return ABIArgInfo::getExtend(Ty);
+  }
+  if (InReg)
+    return ABIArgInfo::getDirectInReg();
+  return ABIArgInfo::getDirect();
+}
+
+LanaiTargetCodeGenInfo::LanaiTargetCodeGenInfo(CodeGenTypes &CGT)
+    : TargetCodeGenInfo(std::make_unique<LanaiABIInfo>(CGT)) {}

clang/lib/CodeGen/Targets/LoongArch.h

+//===- LoongArch.h ----------------------------------------------*- C++ -*-===//
+//
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
+//
+//===----------------------------------------------------------------------===//
+
+#ifndef LLVM_CLANG_LIB_CODEGEN_TARGETS_LOONGARCH_H
+#define LLVM_CLANG_LIB_CODEGEN_TARGETS_LOONGARCH_H
+
+#include "TargetInfo.h"
+
+namespace clang::CodeGen {
+
+class LLVM_LIBRARY_VISIBILITY LoongArchTargetCodeGenInfo
+    : public TargetCodeGenInfo {
+public:
+  LoongArchTargetCodeGenInfo(CodeGen::CodeGenTypes &CGT, unsigned GRLen,
+                             unsigned FRLen);
+};
+
+} // namespace clang::CodeGen
+
+#endif // LLVM_CLANG_LIB_CODEGEN_TARGETS_LOONGARCH_H

clang/lib/CodeGen/Targets/LoongArch.cpp

+//===- LoongArch.cpp ------------------------------------------------------===//
+//
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
+//
+//===----------------------------------------------------------------------===//
+
+#include "LoongArch.h"
+#include "ABIInfoImpl.h"
+
+using namespace clang;
+using namespace clang::CodeGen;
+
+// LoongArch ABI Implementation. Documented at
+// https://loongson.github.io/LoongArch-Documentation/LoongArch-ELF-ABI-EN.html
+//
+//===----------------------------------------------------------------------===//
+
+namespace {
+class LoongArchABIInfo : public DefaultABIInfo {
+private:
+  // Size of the integer ('r') registers in bits.
+  unsigned GRLen;
+  // Size of the floating point ('f') registers in bits.
+  unsigned FRLen;
+  // Number of general-purpose argument registers.
+  static const int NumGARs = 8;
+  // Number of floating-point argument registers.
+  static const int NumFARs = 8;
+  bool detectFARsEligibleStructHelper(QualType Ty, CharUnits CurOff,
+                                      llvm::Type *&Field1Ty,
+                                      CharUnits &Field1Off,
+                                      llvm::Type *&Field2Ty,
+                                      CharUnits &Field2Off) const;
+
+public:
+  LoongArchABIInfo(CodeGen::CodeGenTypes &CGT, unsigned GRLen, unsigned FRLen)
+      : DefaultABIInfo(CGT), GRLen(GRLen), FRLen(FRLen) {}
+
+  void computeInfo(CGFunctionInfo &FI) const override;
+
+  ABIArgInfo classifyArgumentType(QualType Ty, bool IsFixed, int &GARsLeft,
+                                  int &FARsLeft) const;
+  ABIArgInfo classifyReturnType(QualType RetTy) const;
+
+  Address EmitVAArg(CodeGenFunction &CGF, Address VAListAddr,
+                    QualType Ty) const override;
+
+  ABIArgInfo extendType(QualType Ty) const;
+
+  bool detectFARsEligibleStruct(QualType Ty, llvm::Type *&Field1Ty,
+                                CharUnits &Field1Off, llvm::Type *&Field2Ty,
+                                CharUnits &Field2Off, int &NeededArgGPRs,
+                                int &NeededArgFPRs) const;
+  ABIArgInfo coerceAndExpandFARsEligibleStruct(llvm::Type *Field1Ty,
+                                               CharUnits Field1Off,
+                                               llvm::Type *Field2Ty,
+                                               CharUnits Field2Off) const;
+};
+} // end anonymous namespace
+
+void LoongArchABIInfo::computeInfo(CGFunctionInfo &FI) const {
+  QualType RetTy = FI.getReturnType();
+  if (!getCXXABI().classifyReturnType(FI))
+    FI.getReturnInfo() = classifyReturnType(RetTy);
+
+  // IsRetIndirect is true if classifyArgumentType indicated the value should
+  // be passed indirect, or if the type size is a scalar greater than 2*GRLen
+  // and not a complex type with elements <= FRLen. e.g. fp128 is passed direct
+  // in LLVM IR, relying on the backend lowering code to rewrite the argument
+  // list and pass indirectly on LA32.
+  bool IsRetIndirect = FI.getReturnInfo().getKind() == ABIArgInfo::Indirect;
+  if (!IsRetIndirect && RetTy->isScalarType() &&
+      getContext().getTypeSize(RetTy) > (2 * GRLen)) {
+    if (RetTy->isComplexType() && FRLen) {
+      QualType EltTy = RetTy->castAs<ComplexType>()->getElementType();
+      IsRetIndirect = getContext().getTypeSize(EltTy) > FRLen;
+    } else {
+      // This is a normal scalar > 2*GRLen, such as fp128 on LA32.
+      IsRetIndirect = true;
+    }
+  }
+
+  // We must track the number of GARs and FARs used in order to conform to the
+  // LoongArch ABI. As GAR usage is different for variadic arguments, we must
+  // also track whether we are examining a vararg or not.
+  int GARsLeft = IsRetIndirect ? NumGARs - 1 : NumGARs;
+  int FARsLeft = FRLen ? NumFARs : 0;
+  int NumFixedArgs = FI.getNumRequiredArgs();
+
+  int ArgNum = 0;
+  for (auto &ArgInfo : FI.arguments()) {
+    ArgInfo.info = classifyArgumentType(
+        ArgInfo.type, /*IsFixed=*/ArgNum < NumFixedArgs, GARsLeft, FARsLeft);
+    ArgNum++;
+  }
+}
+
+// Returns true if the struct is a potential candidate to be passed in FARs (and
+// GARs). If this function returns true, the caller is responsible for checking
+// that if there is only a single field then that field is a float.
+bool LoongArchABIInfo::detectFARsEligibleStructHelper(
+    QualType Ty, CharUnits CurOff, llvm::Type *&Field1Ty, CharUnits &Field1Off,
+    llvm::Type *&Field2Ty, CharUnits &Field2Off) const {
+  bool IsInt = Ty->isIntegralOrEnumerationType();
+  bool IsFloat = Ty->isRealFloatingType();
+
+  if (IsInt || IsFloat) {
+    uint64_t Size = getContext().getTypeSize(Ty);
+    if (IsInt && Size > GRLen)
+      return false;
+    // Can't be eligible if larger than the FP registers. Half precision isn't
+    // currently supported on LoongArch and the ABI hasn't been confirmed, so
+    // default to the integer ABI in that case.
+    if (IsFloat && (Size > FRLen || Size < 32))
+      return false;
+    // Can't be eligible if an integer type was already found (int+int pairs
+    // are not eligible).
+    if (IsInt && Field1Ty && Field1Ty->isIntegerTy())
+      return false;
+    if (!Field1Ty) {
+      Field1Ty = CGT.ConvertType(Ty);
+      Field1Off = CurOff;
+      return true;
+    }
+    if (!Field2Ty) {
+      Field2Ty = CGT.ConvertType(Ty);
+      Field2Off = CurOff;
+      return true;
+    }
+    return false;
+  }
+
+  if (auto CTy = Ty->getAs<ComplexType>()) {
+    if (Field1Ty)
+      return false;
+    QualType EltTy = CTy->getElementType();
+    if (getContext().getTypeSize(EltTy) > FRLen)
+      return false;
+    Field1Ty = CGT.ConvertType(EltTy);
+    Field1Off = CurOff;
+    Field2Ty = Field1Ty;
+    Field2Off = Field1Off + getContext().getTypeSizeInChars(EltTy);
+    return true;
+  }
+
+  if (const ConstantArrayType *ATy = getContext().getAsConstantArrayType(Ty)) {
+    uint64_t ArraySize = ATy->getSize().getZExtValue();
+    QualType EltTy = ATy->getElementType();
+    CharUnits EltSize = getContext().getTypeSizeInChars(EltTy);
+    for (uint64_t i = 0; i < ArraySize; ++i) {
+      if (!detectFARsEligibleStructHelper(EltTy, CurOff, Field1Ty, Field1Off,
+                                          Field2Ty, Field2Off))
+        return false;
+      CurOff += EltSize;
+    }
+    return true;
+  }
+
+  if (const auto *RTy = Ty->getAs<RecordType>()) {
+    // Structures with either a non-trivial destructor or a non-trivial
+    // copy constructor are not eligible for the FP calling convention.
+    if (getRecordArgABI(Ty, CGT.getCXXABI()))
+      return false;
+    if (isEmptyRecord(getContext(), Ty, true))
+      return true;
+    const RecordDecl *RD = RTy->getDecl();
+    // Unions aren't eligible unless they're empty (which is caught above).
+    if (RD->isUnion())
+      return false;
+    const ASTRecordLayout &Layout = getContext().getASTRecordLayout(RD);
+    // If this is a C++ record, check the bases first.
+    if (const CXXRecordDecl *CXXRD = dyn_cast<CXXRecordDecl>(RD)) {
+      for (const CXXBaseSpecifier &B : CXXRD->bases()) {
+        const auto *BDecl =
+            cast<CXXRecordDecl>(B.getType()->castAs<RecordType>()->getDecl());
+        if (!detectFARsEligibleStructHelper(
+                B.getType(), CurOff + Layout.getBaseClassOffset(BDecl),
+                Field1Ty, Field1Off, Field2Ty, Field2Off))
+          return false;
+      }
+    }
+    for (const FieldDecl *FD : RD->fields()) {
+      QualType QTy = FD->getType();
+      if (FD->isBitField()) {
+        unsigned BitWidth = FD->getBitWidthValue(getContext());
+        // Zero-width bitfields are ignored.
+        if (BitWidth == 0)
+          continue;
+        // Allow a bitfield with a type greater than GRLen as long as the
+        // bitwidth is GRLen or less.
+        if (getContext().getTypeSize(QTy) > GRLen && BitWidth <= GRLen) {
+          QTy = getContext().getIntTypeForBitwidth(GRLen, false);
+        }
+      }
+
+      if (!detectFARsEligibleStructHelper(
+              QTy,
+              CurOff + getContext().toCharUnitsFromBits(
+                           Layout.getFieldOffset(FD->getFieldIndex())),
+              Field1Ty, Field1Off, Field2Ty, Field2Off))
+        return false;
+    }
+    return Field1Ty != nullptr;
+  }
+
+  return false;
+}
+
+// Determine if a struct is eligible to be passed in FARs (and GARs) (i.e., when
+// flattened it contains a single fp value, fp+fp, or int+fp of appropriate
+// size). If so, NeededFARs and NeededGARs are incremented appropriately.
+bool LoongArchABIInfo::detectFARsEligibleStruct(
+    QualType Ty, llvm::Type *&Field1Ty, CharUnits &Field1Off,
+    llvm::Type *&Field2Ty, CharUnits &Field2Off, int &NeededGARs,
+    int &NeededFARs) const {
+  Field1Ty = nullptr;
+  Field2Ty = nullptr;
+  NeededGARs = 0;
+  NeededFARs = 0;
+  if (!detectFARsEligibleStructHelper(Ty, CharUnits::Zero(), Field1Ty,
+                                      Field1Off, Field2Ty, Field2Off))
+    return false;
+  // Not really a candidate if we have a single int but no float.
+  if (Field1Ty && !Field2Ty && !Field1Ty->isFloatingPointTy())
+    return false;
+  if (Field1Ty && Field1Ty->isFloatingPointTy())
+    NeededFARs++;
+  else if (Field1Ty)
+    NeededGARs++;
+  if (Field2Ty && Field2Ty->isFloatingPointTy())
+    NeededFARs++;
+  else if (Field2Ty)
+    NeededGARs++;
+  return true;
+}
+
+// Call getCoerceAndExpand for the two-element flattened struct described by
+// Field1Ty, Field1Off, Field2Ty, Field2Off. This method will create an
+// appropriate coerceToType and unpaddedCoerceToType.
+ABIArgInfo LoongArchABIInfo::coerceAndExpandFARsEligibleStruct(
+    llvm::Type *Field1Ty, CharUnits Field1Off, llvm::Type *Field2Ty,
+    CharUnits Field2Off) const {
+  SmallVector<llvm::Type *, 3> CoerceElts;
+  SmallVector<llvm::Type *, 2> UnpaddedCoerceElts;
+  if (!Field1Off.isZero())
+    CoerceElts.push_back(llvm::ArrayType::get(
+        llvm::Type::getInt8Ty(getVMContext()), Field1Off.getQuantity()));
+
+  CoerceElts.push_back(Field1Ty);
+  UnpaddedCoerceElts.push_back(Field1Ty);
+
+  if (!Field2Ty) {
+    return ABIArgInfo::getCoerceAndExpand(
+        llvm::StructType::get(getVMContext(), CoerceElts, !Field1Off.isZero()),
+        UnpaddedCoerceElts[0]);
+  }
+
+  CharUnits Field2Align =
+      CharUnits::fromQuantity(getDataLayout().getABITypeAlign(Field2Ty));
+  CharUnits Field1End =
+      Field1Off +
+      CharUnits::fromQuantity(getDataLayout().getTypeStoreSize(Field1Ty));
+  CharUnits Field2OffNoPadNoPack = Field1End.alignTo(Field2Align);
+
+  CharUnits Padding = CharUnits::Zero();
+  if (Field2Off > Field2OffNoPadNoPack)
+    Padding = Field2Off - Field2OffNoPadNoPack;
+  else if (Field2Off != Field2Align && Field2Off > Field1End)
+    Padding = Field2Off - Field1End;
+
+  bool IsPacked = !Field2Off.isMultipleOf(Field2Align);
+
+  if (!Padding.isZero())
+    CoerceElts.push_back(llvm::ArrayType::get(
+        llvm::Type::getInt8Ty(getVMContext()), Padding.getQuantity()));
+
+  CoerceElts.push_back(Field2Ty);
+  UnpaddedCoerceElts.push_back(Field2Ty);
+
+  return ABIArgInfo::getCoerceAndExpand(
+      llvm::StructType::get(getVMContext(), CoerceElts, IsPacked),
+      llvm::StructType::get(getVMContext(), UnpaddedCoerceElts, IsPacked));
+}
+
+ABIArgInfo LoongArchABIInfo::classifyArgumentType(QualType Ty, bool IsFixed,
+                                                  int &GARsLeft,
+                                                  int &FARsLeft) const {
+  assert(GARsLeft <= NumGARs && "GAR tracking underflow");
+  Ty = useFirstFieldIfTransparentUnion(Ty);
+
+  // Structures with either a non-trivial destructor or a non-trivial
+  // copy constructor are always passed indirectly.
+  if (CGCXXABI::RecordArgABI RAA = getRecordArgABI(Ty, getCXXABI())) {
+    if (GARsLeft)
+      GARsLeft -= 1;
+    return getNaturalAlignIndirect(Ty, /*ByVal=*/RAA ==
+                                           CGCXXABI::RAA_DirectInMemory);
+  }
+
+  // Ignore empty structs/unions.
+  if (isEmptyRecord(getContext(), Ty, true))
+    return ABIArgInfo::getIgnore();
+
+  uint64_t Size = getContext().getTypeSize(Ty);
+
+  // Pass floating point values via FARs if possible.
+  if (IsFixed && Ty->isFloatingType() && !Ty->isComplexType() &&
+      FRLen >= Size && FARsLeft) {
+    FARsLeft--;
+    return ABIArgInfo::getDirect();
+  }
+
+  // Complex types for the *f or *d ABI must be passed directly rather than
+  // using CoerceAndExpand.
+  if (IsFixed && Ty->isComplexType() && FRLen && FARsLeft >= 2) {
+    QualType EltTy = Ty->castAs<ComplexType>()->getElementType();
+    if (getContext().getTypeSize(EltTy) <= FRLen) {
+      FARsLeft -= 2;
+      return ABIArgInfo::getDirect();
+    }
+  }
+
+  if (IsFixed && FRLen && Ty->isStructureOrClassType()) {
+    llvm::Type *Field1Ty = nullptr;
+    llvm::Type *Field2Ty = nullptr;
+    CharUnits Field1Off = CharUnits::Zero();
+    CharUnits Field2Off = CharUnits::Zero();
+    int NeededGARs = 0;
+    int NeededFARs = 0;
+    bool IsCandidate = detectFARsEligibleStruct(
+        Ty, Field1Ty, Field1Off, Field2Ty, Field2Off, NeededGARs, NeededFARs);
+    if (IsCandidate && NeededGARs <= GARsLeft && NeededFARs <= FARsLeft) {
+      GARsLeft -= NeededGARs;
+      FARsLeft -= NeededFARs;
+      return coerceAndExpandFARsEligibleStruct(Field1Ty, Field1Off, Field2Ty,
+                                               Field2Off);
+    }
+  }
+
+  uint64_t NeededAlign = getContext().getTypeAlign(Ty);
+  // Determine the number of GARs needed to pass the current argument
+  // according to the ABI. 2*GRLen-aligned varargs are passed in "aligned"
+  // register pairs, so may consume 3 registers.
+  int NeededGARs = 1;
+  if (!IsFixed && NeededAlign == 2 * GRLen)
+    NeededGARs = 2 + (GARsLeft % 2);
+  else if (Size > GRLen && Size <= 2 * GRLen)
+    NeededGARs = 2;
+
+  if (NeededGARs > GARsLeft)
+    NeededGARs = GARsLeft;
+
+  GARsLeft -= NeededGARs;
+
+  if (!isAggregateTypeForABI(Ty) && !Ty->isVectorType()) {
+    // Treat an enum type as its underlying type.
+    if (const EnumType *EnumTy = Ty->getAs<EnumType>())
+      Ty = EnumTy->getDecl()->getIntegerType();
+
+    // All integral types are promoted to GRLen width.
+    if (Size < GRLen && Ty->isIntegralOrEnumerationType())
+      return extendType(Ty);
+
+    if (const auto *EIT = Ty->getAs<BitIntType>()) {
+      if (EIT->getNumBits() < GRLen)
+        return extendType(Ty);
+      if (EIT->getNumBits() > 128 ||
+          (!getContext().getTargetInfo().hasInt128Type() &&
+           EIT->getNumBits() > 64))
+        return getNaturalAlignIndirect(Ty, /*ByVal=*/false);
+    }
+
+    return ABIArgInfo::getDirect();
+  }
+
+  // Aggregates which are <= 2*GRLen will be passed in registers if possible,
+  // so coerce to integers.
+  if (Size <= 2 * GRLen) {
+    // Use a single GRLen int if possible, 2*GRLen if 2*GRLen alignment is
+    // required, and a 2-element GRLen array if only GRLen alignment is
+    // required.
+    if (Size <= GRLen) {
+      return ABIArgInfo::getDirect(
+          llvm::IntegerType::get(getVMContext(), GRLen));
+    }
+    if (getContext().getTypeAlign(Ty) == 2 * GRLen) {
+      return ABIArgInfo::getDirect(
+          llvm::IntegerType::get(getVMContext(), 2 * GRLen));
+    }
+    return ABIArgInfo::getDirect(
+        llvm::ArrayType::get(llvm::IntegerType::get(getVMContext(), GRLen), 2));
+  }
+  return getNaturalAlignIndirect(Ty, /*ByVal=*/false);
+}
+
+ABIArgInfo LoongArchABIInfo::classifyReturnType(QualType RetTy) const {
+  if (RetTy->isVoidType())
+    return ABIArgInfo::getIgnore();
+  // The rules for return and argument types are the same, so defer to
+  // classifyArgumentType.
+  int GARsLeft = 2;
+  int FARsLeft = FRLen ? 2 : 0;
+  return classifyArgumentType(RetTy, /*IsFixed=*/true, GARsLeft, FARsLeft);
+}
+
+Address LoongArchABIInfo::EmitVAArg(CodeGenFunction &CGF, Address VAListAddr,
+                                    QualType Ty) const {
+  CharUnits SlotSize = CharUnits::fromQuantity(GRLen / 8);
+
+  // Empty records are ignored for parameter passing purposes.
+  if (isEmptyRecord(getContext(), Ty, true)) {
+    Address Addr = Address(CGF.Builder.CreateLoad(VAListAddr),
+                           getVAListElementType(CGF), SlotSize);
+    Addr = CGF.Builder.CreateElementBitCast(Addr, CGF.ConvertTypeForMem(Ty));
+    return Addr;
+  }
+
+  auto TInfo = getContext().getTypeInfoInChars(Ty);
+
+  // Arguments bigger than 2*GRLen bytes are passed indirectly.
+  return emitVoidPtrVAArg(CGF, VAListAddr, Ty,
+                          /*IsIndirect=*/TInfo.Width > 2 * SlotSize, TInfo,
+                          SlotSize,
+                          /*AllowHigherAlign=*/true);
+}
+
+ABIArgInfo LoongArchABIInfo::extendType(QualType Ty) const {
+  int TySize = getContext().getTypeSize(Ty);
+  // LA64 ABI requires unsigned 32 bit integers to be sign extended.
+  if (GRLen == 64 && Ty->isUnsignedIntegerOrEnumerationType() && TySize == 32)
+    return ABIArgInfo::getSignExtend(Ty);
+  return ABIArgInfo::getExtend(Ty);
+}
+
+LoongArchTargetCodeGenInfo::LoongArchTargetCodeGenInfo(CodeGenTypes &CGT,
+                                                       unsigned GRLen,
+                                                       unsigned FRLen)
+    : TargetCodeGenInfo(std::make_unique<LoongArchABIInfo>(CGT, GRLen, FRLen)) {
+}

clang/lib/CodeGen/Targets/M68k.h

+//===- M68k.h ---------------------------------------------------*- C++ -*-===//
+//
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
+//
+//===----------------------------------------------------------------------===//
+
+#ifndef LLVM_CLANG_LIB_CODEGEN_TARGETS_M68K_H
+#define LLVM_CLANG_LIB_CODEGEN_TARGETS_M68K_H
+
+#include "TargetInfo.h"
+
+namespace clang::CodeGen {
+
+class LLVM_LIBRARY_VISIBILITY M68kTargetCodeGenInfo : public TargetCodeGenInfo {
+public:
+  M68kTargetCodeGenInfo(CodeGenTypes &CGT);
+  void setTargetAttributes(const Decl *D, llvm::GlobalValue *GV,
+                           CodeGen::CodeGenModule &M) const override;
+};
+
+} // namespace clang::CodeGen
+
+#endif // LLVM_CLANG_LIB_CODEGEN_TARGETS_M68K_H

clang/lib/CodeGen/Targets/M68k.cpp

+//===- M68k.cpp -----------------------------------------------------------===//
+//
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
+//
+//===----------------------------------------------------------------------===//
+
+#include "M68k.h"
+#include "ABIInfoImpl.h"
+
+using namespace clang;
+using namespace clang::CodeGen;
+
+//===----------------------------------------------------------------------===//
+// M68k ABI Implementation
+//===----------------------------------------------------------------------===//
+
+M68kTargetCodeGenInfo::M68kTargetCodeGenInfo(CodeGenTypes &CGT)
+    : TargetCodeGenInfo(std::make_unique<DefaultABIInfo>(CGT)) {}
+
+void M68kTargetCodeGenInfo::setTargetAttributes(
+    const Decl *D, llvm::GlobalValue *GV, CodeGen::CodeGenModule &M) const {
+  if (const auto *FD = dyn_cast_or_null<FunctionDecl>(D)) {
+    if (const auto *attr = FD->getAttr<M68kInterruptAttr>()) {
+      // Handle 'interrupt' attribute:
+      llvm::Function *F = cast<llvm::Function>(GV);
+
+      // Step 1: Set ISR calling convention.
+      F->setCallingConv(llvm::CallingConv::M68k_INTR);
+
+      // Step 2: Add attributes goodness.
+      F->addFnAttr(llvm::Attribute::NoInline);
+
+      // Step 3: Emit ISR vector alias.
+      unsigned Num = attr->getNumber() / 2;
+      llvm::GlobalAlias::create(llvm::Function::ExternalLinkage,
+                                "__isr_" + Twine(Num), F);
+    }
+  }
+}

clang/lib/CodeGen/Targets/MSP430.h

+//===- MSP430.h -------------------------------------------------*- C++ -*-===//
+//
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
+//
+//===----------------------------------------------------------------------===//
+
+#ifndef LLVM_CLANG_LIB_CODEGEN_TARGETS_MSP430_H
+#define LLVM_CLANG_LIB_CODEGEN_TARGETS_MSP430_H
+
+#include "TargetInfo.h"
+
+namespace clang::CodeGen {
+
+class LLVM_LIBRARY_VISIBILITY MSP430TargetCodeGenInfo
+    : public TargetCodeGenInfo {
+public:
+  MSP430TargetCodeGenInfo(CodeGenTypes &CGT);
+  void setTargetAttributes(const Decl *D, llvm::GlobalValue *GV,
+                           CodeGen::CodeGenModule &M) const override;
+};
+
+} // namespace clang::CodeGen
+
+#endif // LLVM_CLANG_LIB_CODEGEN_TARGETS_MSP430_H

clang/lib/CodeGen/Targets/MSP430.cpp

+//===- MSP430.cpp ---------------------------------------------------------===//
+//
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
+//
+//===----------------------------------------------------------------------===//
+
+#include "MSP430.h"
+#include "ABIInfoImpl.h"
+
+using namespace clang;
+using namespace clang::CodeGen;
+
+//===----------------------------------------------------------------------===//
+// MSP430 ABI Implementation
+//===----------------------------------------------------------------------===//
+
+namespace {
+
+class MSP430ABIInfo : public DefaultABIInfo {
+  static ABIArgInfo complexArgInfo() {
+    ABIArgInfo Info = ABIArgInfo::getDirect();
+    Info.setCanBeFlattened(false);
+    return Info;
+  }
+
+public:
+  MSP430ABIInfo(CodeGenTypes &CGT) : DefaultABIInfo(CGT) {}
+
+  ABIArgInfo classifyReturnType(QualType RetTy) const {
+    if (RetTy->isAnyComplexType())
+      return complexArgInfo();
+
+    return DefaultABIInfo::classifyReturnType(RetTy);
+  }
+
+  ABIArgInfo classifyArgumentType(QualType RetTy) const {
+    if (RetTy->isAnyComplexType())
+      return complexArgInfo();
+
+    return DefaultABIInfo::classifyArgumentType(RetTy);
+  }
+
+  // Just copy the original implementations because
+  // DefaultABIInfo::classify{Return,Argument}Type() are not virtual
+  void computeInfo(CGFunctionInfo &FI) const override {
+    if (!getCXXABI().classifyReturnType(FI))
+      FI.getReturnInfo() = classifyReturnType(FI.getReturnType());
+    for (auto &I : FI.arguments())
+      I.info = classifyArgumentType(I.type);
+  }
+
+  Address EmitVAArg(CodeGenFunction &CGF, Address VAListAddr,
+                    QualType Ty) const override {
+    return EmitVAArgInstr(CGF, VAListAddr, Ty, classifyArgumentType(Ty));
+  }
+};
+
+} // namespace
+
+MSP430TargetCodeGenInfo::MSP430TargetCodeGenInfo(CodeGenTypes &CGT)
+    : TargetCodeGenInfo(std::make_unique<MSP430ABIInfo>(CGT)) {}
+
+void MSP430TargetCodeGenInfo::setTargetAttributes(
+    const Decl *D, llvm::GlobalValue *GV, CodeGen::CodeGenModule &M) const {
+  if (GV->isDeclaration())
+    return;
+  if (const FunctionDecl *FD = dyn_cast_or_null<FunctionDecl>(D)) {
+    const auto *InterruptAttr = FD->getAttr<MSP430InterruptAttr>();
+    if (!InterruptAttr)
+      return;
+
+    // Handle 'interrupt' attribute:
+    llvm::Function *F = cast<llvm::Function>(GV);
+
+    // Step 1: Set ISR calling convention.
+    F->setCallingConv(llvm::CallingConv::MSP430_INTR);
+
+    // Step 2: Add attributes goodness.
+    F->addFnAttr(llvm::Attribute::NoInline);
+    F->addFnAttr("interrupt", llvm::utostr(InterruptAttr->getNumber()));
+  }
+}

clang/lib/CodeGen/Targets/Mips.h

+//===- Mips.h ---------------------------------------------------*- C++ -*-===//
+//
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
+//
+//===----------------------------------------------------------------------===//
+
+#ifndef LLVM_CLANG_LIB_CODEGEN_TARGETS_MIPS_H
+#define LLVM_CLANG_LIB_CODEGEN_TARGETS_MIPS_H
+
+#include "TargetInfo.h"
+
+namespace clang::CodeGen {
+
+class LLVM_LIBRARY_VISIBILITY MIPSTargetCodeGenInfo : public TargetCodeGenInfo {
+  unsigned SizeOfUnwindException;
+
+public:
+  MIPSTargetCodeGenInfo(CodeGenTypes &CGT, bool IsO32);
+
+  int getDwarfEHStackPointer(CodeGen::CodeGenModule &CGM) const override {
+    return 29;
+  }
+
+  void setTargetAttributes(const Decl *D, llvm::GlobalValue *GV,
+                           CodeGen::CodeGenModule &CGM) const override;
+
+  bool initDwarfEHRegSizeTable(CodeGen::CodeGenFunction &CGF,
+                               llvm::Value *Address) const override;
+
+  unsigned getSizeOfUnwindException() const override {
+    return SizeOfUnwindException;
+  }
+};
+
+} // namespace clang::CodeGen
+
+#endif // LLVM_CLANG_LIB_CODEGEN_TARGETS_MIPS_H

clang/lib/CodeGen/Targets/Mips.cpp

+//===- Mips.cpp -----------------------------------------------------------===//
+//
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
+//
+//===----------------------------------------------------------------------===//
+
+#include "Mips.h"
+#include "ABIInfoImpl.h"
+
+using namespace clang;
+using namespace clang::CodeGen;
+
+//===----------------------------------------------------------------------===//
+// MIPS ABI Implementation.  This works for both little-endian and
+// big-endian variants.
+//===----------------------------------------------------------------------===//
+
+namespace {
+class MipsABIInfo : public ABIInfo {
+  bool IsO32;
+  const unsigned MinABIStackAlignInBytes, StackAlignInBytes;
+  void CoerceToIntArgs(uint64_t TySize,
+                       SmallVectorImpl<llvm::Type *> &ArgList) const;
+  llvm::Type *HandleAggregates(QualType Ty, uint64_t TySize) const;
+  llvm::Type *returnAggregateInRegs(QualType RetTy, uint64_t Size) const;
+  llvm::Type *getPaddingType(uint64_t Align, uint64_t Offset) const;
+
+public:
+  MipsABIInfo(CodeGenTypes &CGT, bool _IsO32)
+      : ABIInfo(CGT), IsO32(_IsO32), MinABIStackAlignInBytes(IsO32 ? 4 : 8),
+        StackAlignInBytes(IsO32 ? 8 : 16) {}
+
+  ABIArgInfo classifyReturnType(QualType RetTy) const;
+  ABIArgInfo classifyArgumentType(QualType RetTy, uint64_t &Offset) const;
+  void computeInfo(CGFunctionInfo &FI) const override;
+  Address EmitVAArg(CodeGenFunction &CGF, Address VAListAddr,
+                    QualType Ty) const override;
+  ABIArgInfo extendType(QualType Ty) const;
+};
+} // namespace
+
+void MipsABIInfo::CoerceToIntArgs(
+    uint64_t TySize, SmallVectorImpl<llvm::Type *> &ArgList) const {
+  llvm::IntegerType *IntTy =
+      llvm::IntegerType::get(getVMContext(), MinABIStackAlignInBytes * 8);
+
+  // Add (TySize / MinABIStackAlignInBytes) args of IntTy.
+  for (unsigned N = TySize / (MinABIStackAlignInBytes * 8); N; --N)
+    ArgList.push_back(IntTy);
+
+  // If necessary, add one more integer type to ArgList.
+  unsigned R = TySize % (MinABIStackAlignInBytes * 8);
+
+  if (R)
+    ArgList.push_back(llvm::IntegerType::get(getVMContext(), R));
+}
+
+// In N32/64, an aligned double precision floating point field is passed in
+// a register.
+llvm::Type *MipsABIInfo::HandleAggregates(QualType Ty, uint64_t TySize) const {
+  SmallVector<llvm::Type *, 8> ArgList, IntArgList;
+
+  if (IsO32) {
+    CoerceToIntArgs(TySize, ArgList);
+    return llvm::StructType::get(getVMContext(), ArgList);
+  }
+
+  if (Ty->isComplexType())
+    return CGT.ConvertType(Ty);
+
+  const RecordType *RT = Ty->getAs<RecordType>();
+
+  // Unions/vectors are passed in integer registers.
+  if (!RT || !RT->isStructureOrClassType()) {
+    CoerceToIntArgs(TySize, ArgList);
+    return llvm::StructType::get(getVMContext(), ArgList);
+  }
+
+  const RecordDecl *RD = RT->getDecl();
+  const ASTRecordLayout &Layout = getContext().getASTRecordLayout(RD);
+  assert(!(TySize % 8) && "Size of structure must be multiple of 8.");
+
+  uint64_t LastOffset = 0;
+  unsigned idx = 0;
+  llvm::IntegerType *I64 = llvm::IntegerType::get(getVMContext(), 64);
+
+  // Iterate over fields in the struct/class and check if there are any aligned
+  // double fields.
+  for (RecordDecl::field_iterator i = RD->field_begin(), e = RD->field_end();
+       i != e; ++i, ++idx) {
+    const QualType Ty = i->getType();
+    const BuiltinType *BT = Ty->getAs<BuiltinType>();
+
+    if (!BT || BT->getKind() != BuiltinType::Double)
+      continue;
+
+    uint64_t Offset = Layout.getFieldOffset(idx);
+    if (Offset % 64) // Ignore doubles that are not aligned.
+      continue;
+
+    // Add ((Offset - LastOffset) / 64) args of type i64.
+    for (unsigned j = (Offset - LastOffset) / 64; j > 0; --j)
+      ArgList.push_back(I64);
+
+    // Add double type.
+    ArgList.push_back(llvm::Type::getDoubleTy(getVMContext()));
+    LastOffset = Offset + 64;
+  }
+
+  CoerceToIntArgs(TySize - LastOffset, IntArgList);
+  ArgList.append(IntArgList.begin(), IntArgList.end());
+
+  return llvm::StructType::get(getVMContext(), ArgList);
+}
+
+llvm::Type *MipsABIInfo::getPaddingType(uint64_t OrigOffset,
+                                        uint64_t Offset) const {
+  if (OrigOffset + MinABIStackAlignInBytes > Offset)
+    return nullptr;
+
+  return llvm::IntegerType::get(getVMContext(), (Offset - OrigOffset) * 8);
+}
+
+ABIArgInfo MipsABIInfo::classifyArgumentType(QualType Ty,
+                                             uint64_t &Offset) const {
+  Ty = useFirstFieldIfTransparentUnion(Ty);
+
+  uint64_t OrigOffset = Offset;
+  uint64_t TySize = getContext().getTypeSize(Ty);
+  uint64_t Align = getContext().getTypeAlign(Ty) / 8;
+
+  Align = std::clamp(Align, (uint64_t)MinABIStackAlignInBytes,
+                     (uint64_t)StackAlignInBytes);
+  unsigned CurrOffset = llvm::alignTo(Offset, Align);
+  Offset = CurrOffset + llvm::alignTo(TySize, Align * 8) / 8;
+
+  if (isAggregateTypeForABI(Ty) || Ty->isVectorType()) {
+    // Ignore empty aggregates.
+    if (TySize == 0)
+      return ABIArgInfo::getIgnore();
+
+    if (CGCXXABI::RecordArgABI RAA = getRecordArgABI(Ty, getCXXABI())) {
+      Offset = OrigOffset + MinABIStackAlignInBytes;
+      return getNaturalAlignIndirect(Ty, RAA == CGCXXABI::RAA_DirectInMemory);
+    }
+
+    // If we have reached here, aggregates are passed directly by coercing to
+    // another structure type. Padding is inserted if the offset of the
+    // aggregate is unaligned.
+    ABIArgInfo ArgInfo =
+        ABIArgInfo::getDirect(HandleAggregates(Ty, TySize), 0,
+                              getPaddingType(OrigOffset, CurrOffset));
+    ArgInfo.setInReg(true);
+    return ArgInfo;
+  }
+
+  // Treat an enum type as its underlying type.
+  if (const EnumType *EnumTy = Ty->getAs<EnumType>())
+    Ty = EnumTy->getDecl()->getIntegerType();
+
+  // Make sure we pass indirectly things that are too large.
+  if (const auto *EIT = Ty->getAs<BitIntType>())
+    if (EIT->getNumBits() > 128 ||
+        (EIT->getNumBits() > 64 &&
+         !getContext().getTargetInfo().hasInt128Type()))
+      return getNaturalAlignIndirect(Ty);
+
+  // All integral types are promoted to the GPR width.
+  if (Ty->isIntegralOrEnumerationType())
+    return extendType(Ty);
+
+  return ABIArgInfo::getDirect(
+      nullptr, 0, IsO32 ? nullptr : getPaddingType(OrigOffset, CurrOffset));
+}
+
+llvm::Type *MipsABIInfo::returnAggregateInRegs(QualType RetTy,
+                                               uint64_t Size) const {
+  const RecordType *RT = RetTy->getAs<RecordType>();
+  SmallVector<llvm::Type *, 8> RTList;
+
+  if (RT && RT->isStructureOrClassType()) {
+    const RecordDecl *RD = RT->getDecl();
+    const ASTRecordLayout &Layout = getContext().getASTRecordLayout(RD);
+    unsigned FieldCnt = Layout.getFieldCount();
+
+    // N32/64 returns struct/classes in floating point registers if the
+    // following conditions are met:
+    // 1. The size of the struct/class is no larger than 128-bit.
+    // 2. The struct/class has one or two fields all of which are floating
+    //    point types.
+    // 3. The offset of the first field is zero (this follows what gcc does).
+    //
+    // Any other composite results are returned in integer registers.
+    //
+    if (FieldCnt && (FieldCnt <= 2) && !Layout.getFieldOffset(0)) {
+      RecordDecl::field_iterator b = RD->field_begin(), e = RD->field_end();
+      for (; b != e; ++b) {
+        const BuiltinType *BT = b->getType()->getAs<BuiltinType>();
+
+        if (!BT || !BT->isFloatingPoint())
+          break;
+
+        RTList.push_back(CGT.ConvertType(b->getType()));
+      }
+
+      if (b == e)
+        return llvm::StructType::get(getVMContext(), RTList,
+                                     RD->hasAttr<PackedAttr>());
+
+      RTList.clear();
+    }
+  }
+
+  CoerceToIntArgs(Size, RTList);
+  return llvm::StructType::get(getVMContext(), RTList);
+}
+
+ABIArgInfo MipsABIInfo::classifyReturnType(QualType RetTy) const {
+  uint64_t Size = getContext().getTypeSize(RetTy);
+
+  if (RetTy->isVoidType())
+    return ABIArgInfo::getIgnore();
+
+  // O32 doesn't treat zero-sized structs differently from other structs.
+  // However, N32/N64 ignores zero sized return values.
+  if (!IsO32 && Size == 0)
+    return ABIArgInfo::getIgnore();
+
+  if (isAggregateTypeForABI(RetTy) || RetTy->isVectorType()) {
+    if (Size <= 128) {
+      if (RetTy->isAnyComplexType())
+        return ABIArgInfo::getDirect();
+
+      // O32 returns integer vectors in registers and N32/N64 returns all small
+      // aggregates in registers.
+      if (!IsO32 ||
+          (RetTy->isVectorType() && !RetTy->hasFloatingRepresentation())) {
+        ABIArgInfo ArgInfo =
+            ABIArgInfo::getDirect(returnAggregateInRegs(RetTy, Size));
+        ArgInfo.setInReg(true);
+        return ArgInfo;
+      }
+    }
+
+    return getNaturalAlignIndirect(RetTy);
+  }
+
+  // Treat an enum type as its underlying type.
+  if (const EnumType *EnumTy = RetTy->getAs<EnumType>())
+    RetTy = EnumTy->getDecl()->getIntegerType();
+
+  // Make sure we pass indirectly things that are too large.
+  if (const auto *EIT = RetTy->getAs<BitIntType>())
+    if (EIT->getNumBits() > 128 ||
+        (EIT->getNumBits() > 64 &&
+         !getContext().getTargetInfo().hasInt128Type()))
+      return getNaturalAlignIndirect(RetTy);
+
+  if (isPromotableIntegerTypeForABI(RetTy))
+    return ABIArgInfo::getExtend(RetTy);
+
+  if ((RetTy->isUnsignedIntegerOrEnumerationType() ||
+       RetTy->isSignedIntegerOrEnumerationType()) &&
+      Size == 32 && !IsO32)
+    return ABIArgInfo::getSignExtend(RetTy);
+
+  return ABIArgInfo::getDirect();
+}
+
+void MipsABIInfo::computeInfo(CGFunctionInfo &FI) const {
+  ABIArgInfo &RetInfo = FI.getReturnInfo();
+  if (!getCXXABI().classifyReturnType(FI))
+    RetInfo = classifyReturnType(FI.getReturnType());
+
+  // Check if a pointer to an aggregate is passed as a hidden argument.
+  uint64_t Offset = RetInfo.isIndirect() ? MinABIStackAlignInBytes : 0;
+
+  for (auto &I : FI.arguments())
+    I.info = classifyArgumentType(I.type, Offset);
+}
+
+Address MipsABIInfo::EmitVAArg(CodeGenFunction &CGF, Address VAListAddr,
+                               QualType OrigTy) const {
+  QualType Ty = OrigTy;
+
+  // Integer arguments are promoted to 32-bit on O32 and 64-bit on N32/N64.
+  // Pointers are also promoted in the same way but this only matters for N32.
+  unsigned SlotSizeInBits = IsO32 ? 32 : 64;
+  unsigned PtrWidth = getTarget().getPointerWidth(LangAS::Default);
+  bool DidPromote = false;
+  if ((Ty->isIntegerType() && getContext().getIntWidth(Ty) < SlotSizeInBits) ||
+      (Ty->isPointerType() && PtrWidth < SlotSizeInBits)) {
+    DidPromote = true;
+    Ty = getContext().getIntTypeForBitwidth(SlotSizeInBits,
+                                            Ty->isSignedIntegerType());
+  }
+
+  auto TyInfo = getContext().getTypeInfoInChars(Ty);
+
+  // The alignment of things in the argument area is never larger than
+  // StackAlignInBytes.
+  TyInfo.Align =
+      std::min(TyInfo.Align, CharUnits::fromQuantity(StackAlignInBytes));
+
+  // MinABIStackAlignInBytes is the size of argument slots on the stack.
+  CharUnits ArgSlotSize = CharUnits::fromQuantity(MinABIStackAlignInBytes);
+
+  Address Addr =
+      emitVoidPtrVAArg(CGF, VAListAddr, Ty, /*indirect*/ false, TyInfo,
+                       ArgSlotSize, /*AllowHigherAlign*/ true);
+
+  // If there was a promotion, "unpromote" into a temporary.
+  // TODO: can we just use a pointer into a subset of the original slot?
+  if (DidPromote) {
+    Address Temp = CGF.CreateMemTemp(OrigTy, "vaarg.promotion-temp");
+    llvm::Value *Promoted = CGF.Builder.CreateLoad(Addr);
+
+    // Truncate down to the right width.
+    llvm::Type *IntTy =
+        (OrigTy->isIntegerType() ? Temp.getElementType() : CGF.IntPtrTy);
+    llvm::Value *V = CGF.Builder.CreateTrunc(Promoted, IntTy);
+    if (OrigTy->isPointerType())
+      V = CGF.Builder.CreateIntToPtr(V, Temp.getElementType());
+
+    CGF.Builder.CreateStore(V, Temp);
+    Addr = Temp;
+  }
+
+  return Addr;
+}
+
+ABIArgInfo MipsABIInfo::extendType(QualType Ty) const {
+  int TySize = getContext().getTypeSize(Ty);
+
+  // MIPS64 ABI requires unsigned 32 bit integers to be sign extended.
+  if (Ty->isUnsignedIntegerOrEnumerationType() && TySize == 32)
+    return ABIArgInfo::getSignExtend(Ty);
+
+  return ABIArgInfo::getExtend(Ty);
+}
+
+MIPSTargetCodeGenInfo::MIPSTargetCodeGenInfo(CodeGenTypes &CGT, bool IsO32)
+    : TargetCodeGenInfo(std::make_unique<MipsABIInfo>(CGT, IsO32)),
+      SizeOfUnwindException(IsO32 ? 24 : 32) {}
+
+void MIPSTargetCodeGenInfo::setTargetAttributes(const Decl *D,
+                                                llvm::GlobalValue *GV,
+                                                CodeGenModule &CGM) const {
+  const FunctionDecl *FD = dyn_cast_or_null<FunctionDecl>(D);
+  if (!FD)
+    return;
+  llvm::Function *Fn = cast<llvm::Function>(GV);
+
+  if (FD->hasAttr<MipsLongCallAttr>())
+    Fn->addFnAttr("long-call");
+  else if (FD->hasAttr<MipsShortCallAttr>())
+    Fn->addFnAttr("short-call");
+
+  // Other attributes do not have a meaning for declarations.
+  if (GV->isDeclaration())
+    return;
+
+  if (FD->hasAttr<Mips16Attr>()) {
+    Fn->addFnAttr("mips16");
+  } else if (FD->hasAttr<NoMips16Attr>()) {
+    Fn->addFnAttr("nomips16");
+  }
+
+  if (FD->hasAttr<MicroMipsAttr>())
+    Fn->addFnAttr("micromips");
+  else if (FD->hasAttr<NoMicroMipsAttr>())
+    Fn->addFnAttr("nomicromips");
+
+  const MipsInterruptAttr *Attr = FD->getAttr<MipsInterruptAttr>();
+  if (!Attr)
+    return;
+
+  const char *Kind;
+  switch (Attr->getInterrupt()) {
+  case MipsInterruptAttr::eic:
+    Kind = "eic";
+    break;
+  case MipsInterruptAttr::sw0:
+    Kind = "sw0";
+    break;
+  case MipsInterruptAttr::sw1:
+    Kind = "sw1";
+    break;
+  case MipsInterruptAttr::hw0:
+    Kind = "hw0";
+    break;
+  case MipsInterruptAttr::hw1:
+    Kind = "hw1";
+    break;
+  case MipsInterruptAttr::hw2:
+    Kind = "hw2";
+    break;
+  case MipsInterruptAttr::hw3:
+    Kind = "hw3";
+    break;
+  case MipsInterruptAttr::hw4:
+    Kind = "hw4";
+    break;
+  case MipsInterruptAttr::hw5:
+    Kind = "hw5";
+    break;
+  }
+
+  Fn->addFnAttr("interrupt", Kind);
+}
+
+bool MIPSTargetCodeGenInfo::initDwarfEHRegSizeTable(
+    CodeGen::CodeGenFunction &CGF, llvm::Value *Address) const {
+  // This information comes from gcc's implementation, which seems to
+  // as canonical as it gets.
+
+  // Everything on MIPS is 4 bytes.  Double-precision FP registers
+  // are aliased to pairs of single-precision FP registers.
+  llvm::Value *Four8 = llvm::ConstantInt::get(CGF.Int8Ty, 4);
+
+  // 0-31 are the general purpose registers, $0 - $31.
+  // 32-63 are the floating-point registers, $f0 - $f31.
+  // 64 and 65 are the multiply/divide registers, $hi and $lo.
+  // 66 is the (notional, I think) register for signal-handler return.
+  AssignToArrayRange(CGF.Builder, Address, Four8, 0, 65);
+
+  // 67-74 are the floating-point status registers, $fcc0 - $fcc7.
+  // They are one bit wide and ignored here.
+
+  // 80-111 are the coprocessor 0 registers, $c0r0 - $c0r31.
+  // (coprocessor 1 is the FP unit)
+  // 112-143 are the coprocessor 2 registers, $c2r0 - $c2r31.
+  // 144-175 are the coprocessor 3 registers, $c3r0 - $c3r31.
+  // 176-181 are the DSP accumulator registers.
+  AssignToArrayRange(CGF.Builder, Address, Four8, 80, 181);
+  return false;
+}

clang/lib/CodeGen/Targets/NVPTX.h

+//===- NVPTX.h --------------------------------------------------*- C++ -*-===//
+//
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
+//
+//===----------------------------------------------------------------------===//
+
+#ifndef LLVM_CLANG_LIB_CODEGEN_TARGETS_NVPTX_H
+#define LLVM_CLANG_LIB_CODEGEN_TARGETS_NVPTX_H
+
+#include "TargetInfo.h"
+
+namespace clang::CodeGen {
+
+class LLVM_LIBRARY_VISIBILITY NVPTXTargetCodeGenInfo
+    : public TargetCodeGenInfo {
+public:
+  NVPTXTargetCodeGenInfo(CodeGenTypes &CGT);
+
+  void setTargetAttributes(const Decl *D, llvm::GlobalValue *GV,
+                           CodeGen::CodeGenModule &M) const override;
+  bool shouldEmitStaticExternCAliases() const override;
+
+  llvm::Type *getCUDADeviceBuiltinSurfaceDeviceType() const override;
+
+  llvm::Type *getCUDADeviceBuiltinTextureDeviceType() const override;
+
+  bool emitCUDADeviceBuiltinSurfaceDeviceCopy(CodeGenFunction &CGF, LValue Dst,
+                                              LValue Src) const override {
+    emitBuiltinSurfTexDeviceCopy(CGF, Dst, Src);
+    return true;
+  }
+
+  bool emitCUDADeviceBuiltinTextureDeviceCopy(CodeGenFunction &CGF, LValue Dst,
+                                              LValue Src) const override {
+    emitBuiltinSurfTexDeviceCopy(CGF, Dst, Src);
+    return true;
+  }
+
+private:
+  // Adds a NamedMDNode with GV, Name, and Operand as operands, and adds the
+  // resulting MDNode to the nvvm.annotations MDNode.
+  static void addNVVMMetadata(llvm::GlobalValue *GV, StringRef Name,
+                              int Operand);
+
+  static void emitBuiltinSurfTexDeviceCopy(CodeGenFunction &CGF, LValue Dst,
+                                           LValue Src);
+};
+
+} // namespace clang::CodeGen
+
+#endif // LLVM_CLANG_LIB_CODEGEN_TARGETS_NVPTX_H

clang/lib/CodeGen/Targets/NVPTX.cpp

+//===- NVPTX.cpp ----------------------------------------------------------===//
+//
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
+//
+//===----------------------------------------------------------------------===//
+
+#include "NVPTX.h"
+#include "ABIInfoImpl.h"
+#include "llvm/IR/IntrinsicsNVPTX.h"
+
+using namespace clang;
+using namespace clang::CodeGen;
+
+//===----------------------------------------------------------------------===//
+// NVPTX ABI Implementation
+//===----------------------------------------------------------------------===//
+
+namespace {
+
+class NVPTXABIInfo : public ABIInfo {
+  NVPTXTargetCodeGenInfo &CGInfo;
+
+public:
+  NVPTXABIInfo(CodeGenTypes &CGT, NVPTXTargetCodeGenInfo &Info)
+      : ABIInfo(CGT), CGInfo(Info) {}
+
+  ABIArgInfo classifyReturnType(QualType RetTy) const;
+  ABIArgInfo classifyArgumentType(QualType Ty) const;
+
+  void computeInfo(CGFunctionInfo &FI) const override;
+  Address EmitVAArg(CodeGenFunction &CGF, Address VAListAddr,
+                    QualType Ty) const override;
+  bool isUnsupportedType(QualType T) const;
+  ABIArgInfo coerceToIntArrayWithLimit(QualType Ty, unsigned MaxSize) const;
+};
+
+} // namespace
+
+/// Checks if the type is unsupported directly by the current target.
+bool NVPTXABIInfo::isUnsupportedType(QualType T) const {
+  ASTContext &Context = getContext();
+  if (!Context.getTargetInfo().hasFloat16Type() && T->isFloat16Type())
+    return true;
+  if (!Context.getTargetInfo().hasFloat128Type() &&
+      (T->isFloat128Type() ||
+       (T->isRealFloatingType() && Context.getTypeSize(T) == 128)))
+    return true;
+  if (const auto *EIT = T->getAs<BitIntType>())
+    return EIT->getNumBits() >
+           (Context.getTargetInfo().hasInt128Type() ? 128U : 64U);
+  if (!Context.getTargetInfo().hasInt128Type() && T->isIntegerType() &&
+      Context.getTypeSize(T) > 64U)
+    return true;
+  if (const auto *AT = T->getAsArrayTypeUnsafe())
+    return isUnsupportedType(AT->getElementType());
+  const auto *RT = T->getAs<RecordType>();
+  if (!RT)
+    return false;
+  const RecordDecl *RD = RT->getDecl();
+
+  // If this is a C++ record, check the bases first.
+  if (const CXXRecordDecl *CXXRD = dyn_cast<CXXRecordDecl>(RD))
+    for (const CXXBaseSpecifier &I : CXXRD->bases())
+      if (isUnsupportedType(I.getType()))
+        return true;
+
+  for (const FieldDecl *I : RD->fields())
+    if (isUnsupportedType(I->getType()))
+      return true;
+  return false;
+}
+
+/// Coerce the given type into an array with maximum allowed size of elements.
+ABIArgInfo NVPTXABIInfo::coerceToIntArrayWithLimit(QualType Ty,
+                                                   unsigned MaxSize) const {
+  // Alignment and Size are measured in bits.
+  const uint64_t Size = getContext().getTypeSize(Ty);
+  const uint64_t Alignment = getContext().getTypeAlign(Ty);
+  const unsigned Div = std::min<unsigned>(MaxSize, Alignment);
+  llvm::Type *IntType = llvm::Type::getIntNTy(getVMContext(), Div);
+  const uint64_t NumElements = (Size + Div - 1) / Div;
+  return ABIArgInfo::getDirect(llvm::ArrayType::get(IntType, NumElements));
+}
+
+ABIArgInfo NVPTXABIInfo::classifyReturnType(QualType RetTy) const {
+  if (RetTy->isVoidType())
+    return ABIArgInfo::getIgnore();
+
+  if (getContext().getLangOpts().OpenMP &&
+      getContext().getLangOpts().OpenMPIsDevice && isUnsupportedType(RetTy))
+    return coerceToIntArrayWithLimit(RetTy, 64);
+
+  // note: this is different from default ABI
+  if (!RetTy->isScalarType())
+    return ABIArgInfo::getDirect();
+
+  // Treat an enum type as its underlying type.
+  if (const EnumType *EnumTy = RetTy->getAs<EnumType>())
+    RetTy = EnumTy->getDecl()->getIntegerType();
+
+  return (isPromotableIntegerTypeForABI(RetTy) ? ABIArgInfo::getExtend(RetTy)
+                                               : ABIArgInfo::getDirect());
+}
+
+ABIArgInfo NVPTXABIInfo::classifyArgumentType(QualType Ty) const {
+  // Treat an enum type as its underlying type.
+  if (const EnumType *EnumTy = Ty->getAs<EnumType>())
+    Ty = EnumTy->getDecl()->getIntegerType();
+
+  // Return aggregates type as indirect by value
+  if (isAggregateTypeForABI(Ty)) {
+    // Under CUDA device compilation, tex/surf builtin types are replaced with
+    // object types and passed directly.
+    if (getContext().getLangOpts().CUDAIsDevice) {
+      if (Ty->isCUDADeviceBuiltinSurfaceType())
+        return ABIArgInfo::getDirect(
+            CGInfo.getCUDADeviceBuiltinSurfaceDeviceType());
+      if (Ty->isCUDADeviceBuiltinTextureType())
+        return ABIArgInfo::getDirect(
+            CGInfo.getCUDADeviceBuiltinTextureDeviceType());
+    }
+    return getNaturalAlignIndirect(Ty, /* byval */ true);
+  }
+
+  if (const auto *EIT = Ty->getAs<BitIntType>()) {
+    if ((EIT->getNumBits() > 128) ||
+        (!getContext().getTargetInfo().hasInt128Type() &&
+         EIT->getNumBits() > 64))
+      return getNaturalAlignIndirect(Ty, /* byval */ true);
+  }
+
+  return (isPromotableIntegerTypeForABI(Ty) ? ABIArgInfo::getExtend(Ty)
+                                            : ABIArgInfo::getDirect());
+}
+
+void NVPTXABIInfo::computeInfo(CGFunctionInfo &FI) const {
+  if (!getCXXABI().classifyReturnType(FI))
+    FI.getReturnInfo() = classifyReturnType(FI.getReturnType());
+  for (auto &I : FI.arguments())
+    I.info = classifyArgumentType(I.type);
+
+  // Always honor user-specified calling convention.
+  if (FI.getCallingConvention() != llvm::CallingConv::C)
+    return;
+
+  FI.setEffectiveCallingConvention(getRuntimeCC());
+}
+
+Address NVPTXABIInfo::EmitVAArg(CodeGenFunction &CGF, Address VAListAddr,
+                                QualType Ty) const {
+  llvm_unreachable("NVPTX does not support varargs");
+}
+
+NVPTXTargetCodeGenInfo::NVPTXTargetCodeGenInfo(CodeGenTypes &CGT)
+    : TargetCodeGenInfo(std::make_unique<NVPTXABIInfo>(CGT, *this)) {}
+
+llvm::Type *
+NVPTXTargetCodeGenInfo::getCUDADeviceBuiltinSurfaceDeviceType() const {
+  // On the device side, surface reference is represented as an object handle
+  // in 64-bit integer.
+  return llvm::Type::getInt64Ty(getABIInfo().getVMContext());
+}
+
+llvm::Type *
+NVPTXTargetCodeGenInfo::getCUDADeviceBuiltinTextureDeviceType() const {
+  // On the device side, texture reference is represented as an object handle
+  // in 64-bit integer.
+  return llvm::Type::getInt64Ty(getABIInfo().getVMContext());
+}
+
+void NVPTXTargetCodeGenInfo::emitBuiltinSurfTexDeviceCopy(CodeGenFunction &CGF,
+                                                          LValue Dst,
+                                                          LValue Src) {
+  llvm::Value *Handle = nullptr;
+  llvm::Constant *C =
+      llvm::dyn_cast<llvm::Constant>(Src.getAddress(CGF).getPointer());
+  // Lookup `addrspacecast` through the constant pointer if any.
+  if (auto *ASC = llvm::dyn_cast_or_null<llvm::AddrSpaceCastOperator>(C))
+    C = llvm::cast<llvm::Constant>(ASC->getPointerOperand());
+  if (auto *GV = llvm::dyn_cast_or_null<llvm::GlobalVariable>(C)) {
+    // Load the handle from the specific global variable using
+    // `nvvm.texsurf.handle.internal` intrinsic.
+    Handle = CGF.EmitRuntimeCall(
+        CGF.CGM.getIntrinsic(llvm::Intrinsic::nvvm_texsurf_handle_internal,
+                             {GV->getType()}),
+        {GV}, "texsurf_handle");
+  } else
+    Handle = CGF.EmitLoadOfScalar(Src, SourceLocation());
+  CGF.EmitStoreOfScalar(Handle, Dst);
+}
+
+void NVPTXTargetCodeGenInfo::setTargetAttributes(
+    const Decl *D, llvm::GlobalValue *GV, CodeGen::CodeGenModule &M) const {
+  if (GV->isDeclaration())
+    return;
+  const VarDecl *VD = dyn_cast_or_null<VarDecl>(D);
+  if (VD) {
+    if (M.getLangOpts().CUDA) {
+      if (VD->getType()->isCUDADeviceBuiltinSurfaceType())
+        addNVVMMetadata(GV, "surface", 1);
+      else if (VD->getType()->isCUDADeviceBuiltinTextureType())
+        addNVVMMetadata(GV, "texture", 1);
+      return;
+    }
+  }
+
+  const FunctionDecl *FD = dyn_cast_or_null<FunctionDecl>(D);
+  if (!FD)
+    return;
+
+  llvm::Function *F = cast<llvm::Function>(GV);
+
+  // Perform special handling in OpenCL mode
+  if (M.getLangOpts().OpenCL) {
+    // Use OpenCL function attributes to check for kernel functions
+    // By default, all functions are device functions
+    if (FD->hasAttr<OpenCLKernelAttr>()) {
+      // OpenCL __kernel functions get kernel metadata
+      // Create !{<func-ref>, metadata !"kernel", i32 1} node
+      addNVVMMetadata(F, "kernel", 1);
+      // And kernel functions are not subject to inlining
+      F->addFnAttr(llvm::Attribute::NoInline);
+    }
+  }
+
+  // Perform special handling in CUDA mode.
+  if (M.getLangOpts().CUDA) {
+    // CUDA __global__ functions get a kernel metadata entry.  Since
+    // __global__ functions cannot be called from the device, we do not
+    // need to set the noinline attribute.
+    if (FD->hasAttr<CUDAGlobalAttr>()) {
+      // Create !{<func-ref>, metadata !"kernel", i32 1} node
+      addNVVMMetadata(F, "kernel", 1);
+    }
+    if (CUDALaunchBoundsAttr *Attr = FD->getAttr<CUDALaunchBoundsAttr>()) {
+      // Create !{<func-ref>, metadata !"maxntidx", i32 <val>} node
+      llvm::APSInt MaxThreads(32);
+      MaxThreads = Attr->getMaxThreads()->EvaluateKnownConstInt(M.getContext());
+      if (MaxThreads > 0)
+        addNVVMMetadata(F, "maxntidx", MaxThreads.getExtValue());
+
+      // min blocks is an optional argument for CUDALaunchBoundsAttr. If it was
+      // not specified in __launch_bounds__ or if the user specified a 0 value,
+      // we don't have to add a PTX directive.
+      if (Attr->getMinBlocks()) {
+        llvm::APSInt MinBlocks(32);
+        MinBlocks = Attr->getMinBlocks()->EvaluateKnownConstInt(M.getContext());
+        if (MinBlocks > 0)
+          // Create !{<func-ref>, metadata !"minctasm", i32 <val>} node
+          addNVVMMetadata(F, "minctasm", MinBlocks.getExtValue());
+      }
+    }
+  }
+
+  // Attach kernel metadata directly if compiling for NVPTX.
+  if (FD->hasAttr<NVPTXKernelAttr>()) {
+    addNVVMMetadata(F, "kernel", 1);
+  }
+}
+
+void NVPTXTargetCodeGenInfo::addNVVMMetadata(llvm::GlobalValue *GV,
+                                             StringRef Name, int Operand) {
+  llvm::Module *M = GV->getParent();
+  llvm::LLVMContext &Ctx = M->getContext();
+
+  // Get "nvvm.annotations" metadata node
+  llvm::NamedMDNode *MD = M->getOrInsertNamedMetadata("nvvm.annotations");
+
+  llvm::Metadata *MDVals[] = {
+      llvm::ConstantAsMetadata::get(GV), llvm::MDString::get(Ctx, Name),
+      llvm::ConstantAsMetadata::get(
+          llvm::ConstantInt::get(llvm::Type::getInt32Ty(Ctx), Operand))};
+  // Append metadata to nvvm.annotations
+  MD->addOperand(llvm::MDNode::get(Ctx, MDVals));
+}
+
+bool NVPTXTargetCodeGenInfo::shouldEmitStaticExternCAliases() const {
+  return false;
+}

clang/lib/CodeGen/Targets/PNaCl.h

+//===- PNaCl.h --------------------------------------------------*- C++ -*-===//
+//
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
+//
+//===----------------------------------------------------------------------===//
+
+#ifndef LLVM_CLANG_LIB_CODEGEN_TARGETS_PNACL_H
+#define LLVM_CLANG_LIB_CODEGEN_TARGETS_PNACL_H
+
+#include "TargetInfo.h"
+
+namespace clang::CodeGen {
+
+class LLVM_LIBRARY_VISIBILITY PNaClTargetCodeGenInfo
+    : public TargetCodeGenInfo {
+public:
+  PNaClTargetCodeGenInfo(CodeGen::CodeGenTypes &CGT);
+};
+
+} // namespace clang::CodeGen
+
+#endif // LLVM_CLANG_LIB_CODEGEN_TARGETS_PNACL_H

clang/lib/CodeGen/Targets/PNaCl.cpp

+//===- PNaCl.cpp ----------------------------------------------------------===//
+//
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
+//
+//===----------------------------------------------------------------------===//
+
+#include "PNaCl.h"
+#include "ABIInfoImpl.h"
+
+using namespace clang;
+using namespace clang::CodeGen;
+
+//===----------------------------------------------------------------------===//
+// le32/PNaCl bitcode ABI Implementation
+//
+// This is a simplified version of the x86_32 ABI.  Arguments and return values
+// are always passed on the stack.
+//===----------------------------------------------------------------------===//
+
+namespace {
+class PNaClABIInfo : public ABIInfo {
+public:
+  PNaClABIInfo(CodeGen::CodeGenTypes &CGT) : ABIInfo(CGT) {}
+
+  ABIArgInfo classifyReturnType(QualType RetTy) const;
+  ABIArgInfo classifyArgumentType(QualType RetTy) const;
+
+  void computeInfo(CGFunctionInfo &FI) const override;
+  Address EmitVAArg(CodeGenFunction &CGF, Address VAListAddr,
+                    QualType Ty) const override;
+};
+} // namespace
+
+PNaClTargetCodeGenInfo::PNaClTargetCodeGenInfo(CodeGenTypes &CGT)
+    : TargetCodeGenInfo(std::make_unique<PNaClABIInfo>(CGT)) {}
+
+void PNaClABIInfo::computeInfo(CGFunctionInfo &FI) const {
+  if (!getCXXABI().classifyReturnType(FI))
+    FI.getReturnInfo() = classifyReturnType(FI.getReturnType());
+
+  for (auto &I : FI.arguments())
+    I.info = classifyArgumentType(I.type);
+}
+
+Address PNaClABIInfo::EmitVAArg(CodeGenFunction &CGF, Address VAListAddr,
+                                QualType Ty) const {
+  // The PNaCL ABI is a bit odd, in that varargs don't use normal
+  // function classification. Structs get passed directly for varargs
+  // functions, through a rewriting transform in
+  // pnacl-llvm/lib/Transforms/NaCl/ExpandVarArgs.cpp, which allows
+  // this target to actually support a va_arg instructions with an
+  // aggregate type, unlike other targets.
+  return EmitVAArgInstr(CGF, VAListAddr, Ty, ABIArgInfo::getDirect());
+}
+
+/// Classify argument of given type \p Ty.
+ABIArgInfo PNaClABIInfo::classifyArgumentType(QualType Ty) const {
+  if (isAggregateTypeForABI(Ty)) {
+    if (CGCXXABI::RecordArgABI RAA = getRecordArgABI(Ty, getCXXABI()))
+      return getNaturalAlignIndirect(Ty, RAA == CGCXXABI::RAA_DirectInMemory);
+    return getNaturalAlignIndirect(Ty);
+  } else if (const EnumType *EnumTy = Ty->getAs<EnumType>()) {
+    // Treat an enum type as its underlying type.
+    Ty = EnumTy->getDecl()->getIntegerType();
+  } else if (Ty->isFloatingType()) {
+    // Floating-point types don't go inreg.
+    return ABIArgInfo::getDirect();
+  } else if (const auto *EIT = Ty->getAs<BitIntType>()) {
+    // Treat bit-precise integers as integers if <= 64, otherwise pass
+    // indirectly.
+    if (EIT->getNumBits() > 64)
+      return getNaturalAlignIndirect(Ty);
+    return ABIArgInfo::getDirect();
+  }
+
+  return (isPromotableIntegerTypeForABI(Ty) ? ABIArgInfo::getExtend(Ty)
+                                            : ABIArgInfo::getDirect());
+}
+
+ABIArgInfo PNaClABIInfo::classifyReturnType(QualType RetTy) const {
+  if (RetTy->isVoidType())
+    return ABIArgInfo::getIgnore();
+
+  // In the PNaCl ABI we always return records/structures on the stack.
+  if (isAggregateTypeForABI(RetTy))
+    return getNaturalAlignIndirect(RetTy);
+
+  // Treat bit-precise integers as integers if <= 64, otherwise pass indirectly.
+  if (const auto *EIT = RetTy->getAs<BitIntType>()) {
+    if (EIT->getNumBits() > 64)
+      return getNaturalAlignIndirect(RetTy);
+    return ABIArgInfo::getDirect();
+  }
+
+  // Treat an enum type as its underlying type.
+  if (const EnumType *EnumTy = RetTy->getAs<EnumType>())
+    RetTy = EnumTy->getDecl()->getIntegerType();
+
+  return (isPromotableIntegerTypeForABI(RetTy) ? ABIArgInfo::getExtend(RetTy)
+                                               : ABIArgInfo::getDirect());
+}

clang/lib/CodeGen/Targets/PPC.h

+//===- PPC.h ----------------------------------------------------*- C++ -*-===//
+//
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
+//
+//===----------------------------------------------------------------------===//
+
+#ifndef LLVM_CLANG_LIB_CODEGEN_TARGETS_PPC_H
+#define LLVM_CLANG_LIB_CODEGEN_TARGETS_PPC_H
+
+#include "TargetInfo.h"
+
+namespace clang::CodeGen {
+
+class LLVM_LIBRARY_VISIBILITY AIXTargetCodeGenInfo : public TargetCodeGenInfo {
+  const bool Is64Bit;
+
+public:
+  AIXTargetCodeGenInfo(CodeGen::CodeGenTypes &CGT, bool Is64Bit);
+  int getDwarfEHStackPointer(CodeGen::CodeGenModule &M) const override {
+    return 1; // r1 is the dedicated stack pointer
+  }
+
+  bool initDwarfEHRegSizeTable(CodeGen::CodeGenFunction &CGF,
+                               llvm::Value *Address) const override;
+};
+
+class LLVM_LIBRARY_VISIBILITY PPC32TargetCodeGenInfo
+    : public TargetCodeGenInfo {
+public:
+  PPC32TargetCodeGenInfo(CodeGenTypes &CGT, bool SoftFloatABI,
+                         bool RetSmallStructInRegABI);
+
+  static bool isStructReturnInRegABI(const llvm::Triple &Triple,
+                                     const CodeGenOptions &Opts);
+
+  int getDwarfEHStackPointer(CodeGen::CodeGenModule &M) const override {
+    // This is recovered from gcc output.
+    return 1; // r1 is the dedicated stack pointer
+  }
+
+  bool initDwarfEHRegSizeTable(CodeGen::CodeGenFunction &CGF,
+                               llvm::Value *Address) const override;
+};
+
+enum class PPC64_SVR4_ABIKind {
+  ELFv1 = 0,
+  ELFv2,
+};
+
+class LLVM_LIBRARY_VISIBILITY PPC64_SVR4_TargetCodeGenInfo
+    : public TargetCodeGenInfo {
+
+public:
+  PPC64_SVR4_TargetCodeGenInfo(CodeGenTypes &CGT, PPC64_SVR4_ABIKind Kind,
+                               bool SoftFloatABI);
+
+  int getDwarfEHStackPointer(CodeGen::CodeGenModule &M) const override {
+    // This is recovered from gcc output.
+    return 1; // r1 is the dedicated stack pointer
+  }
+
+  bool initDwarfEHRegSizeTable(CodeGen::CodeGenFunction &CGF,
+                               llvm::Value *Address) const override;
+};
+
+class LLVM_LIBRARY_VISIBILITY PPC64TargetCodeGenInfo
+    : public TargetCodeGenInfo {
+public:
+  PPC64TargetCodeGenInfo(CodeGenTypes &CGT);
+
+  int getDwarfEHStackPointer(CodeGen::CodeGenModule &M) const override {
+    // This is recovered from gcc output.
+    return 1; // r1 is the dedicated stack pointer
+  }
+
+  bool initDwarfEHRegSizeTable(CodeGen::CodeGenFunction &CGF,
+                               llvm::Value *Address) const override;
+};
+
+} // namespace clang::CodeGen
+
+#endif // LLVM_CLANG_LIB_CODEGEN_TARGETS_PPC_H

clang/lib/CodeGen/Targets/PPC.cpp

+//===- PPC.cpp ------------------------------------------------------------===//
+//
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
+//
+//===----------------------------------------------------------------------===//
+
+#include "PPC.h"
+#include "ABIInfoImpl.h"
+
+using namespace clang;
+using namespace clang::CodeGen;
+
+static bool PPC_initDwarfEHRegSizeTable(CodeGen::CodeGenFunction &CGF,
+                                        llvm::Value *Address, bool Is64Bit,
+                                        bool IsAIX) {
+  // This is calculated from the LLVM and GCC tables and verified
+  // against gcc output.  AFAIK all PPC ABIs use the same encoding.
+
+  CodeGen::CGBuilderTy &Builder = CGF.Builder;
+
+  llvm::IntegerType *i8 = CGF.Int8Ty;
+  llvm::Value *Four8 = llvm::ConstantInt::get(i8, 4);
+  llvm::Value *Eight8 = llvm::ConstantInt::get(i8, 8);
+  llvm::Value *Sixteen8 = llvm::ConstantInt::get(i8, 16);
+
+  // 0-31: r0-31, the 4-byte or 8-byte general-purpose registers
+  AssignToArrayRange(Builder, Address, Is64Bit ? Eight8 : Four8, 0, 31);
+
+  // 32-63: fp0-31, the 8-byte floating-point registers
+  AssignToArrayRange(Builder, Address, Eight8, 32, 63);
+
+  // 64-67 are various 4-byte or 8-byte special-purpose registers:
+  // 64: mq
+  // 65: lr
+  // 66: ctr
+  // 67: ap
+  AssignToArrayRange(Builder, Address, Is64Bit ? Eight8 : Four8, 64, 67);
+
+  // 68-76 are various 4-byte special-purpose registers:
+  // 68-75 cr0-7
+  // 76: xer
+  AssignToArrayRange(Builder, Address, Four8, 68, 76);
+
+  // 77-108: v0-31, the 16-byte vector registers
+  AssignToArrayRange(Builder, Address, Sixteen8, 77, 108);
+
+  // 109: vrsave
+  // 110: vscr
+  AssignToArrayRange(Builder, Address, Is64Bit ? Eight8 : Four8, 109, 110);
+
+  // AIX does not utilize the rest of the registers.
+  if (IsAIX)
+    return false;
+
+  // 111: spe_acc
+  // 112: spefscr
+  // 113: sfp
+  AssignToArrayRange(Builder, Address, Is64Bit ? Eight8 : Four8, 111, 113);
+
+  if (!Is64Bit)
+    return false;
+
+  // TODO: Need to verify if these registers are used on 64 bit AIX with Power8
+  // or above CPU.
+  // 64-bit only registers:
+  // 114: tfhar
+  // 115: tfiar
+  // 116: texasr
+  AssignToArrayRange(Builder, Address, Eight8, 114, 116);
+
+  return false;
+}
+
+// AIX
+namespace {
+/// AIXABIInfo - The AIX XCOFF ABI information.
+class AIXABIInfo : public ABIInfo {
+  const bool Is64Bit;
+  const unsigned PtrByteSize;
+  CharUnits getParamTypeAlignment(QualType Ty) const;
+
+public:
+  AIXABIInfo(CodeGen::CodeGenTypes &CGT, bool Is64Bit)
+      : ABIInfo(CGT), Is64Bit(Is64Bit), PtrByteSize(Is64Bit ? 8 : 4) {}
+
+  bool isPromotableTypeForABI(QualType Ty) const;
+
+  ABIArgInfo classifyReturnType(QualType RetTy) const;
+  ABIArgInfo classifyArgumentType(QualType Ty) const;
+
+  void computeInfo(CGFunctionInfo &FI) const override {
+    if (!getCXXABI().classifyReturnType(FI))
+      FI.getReturnInfo() = classifyReturnType(FI.getReturnType());
+
+    for (auto &I : FI.arguments())
+      I.info = classifyArgumentType(I.type);
+  }
+
+  Address EmitVAArg(CodeGenFunction &CGF, Address VAListAddr,
+                    QualType Ty) const override;
+};
+} // namespace
+
+// Return true if the ABI requires Ty to be passed sign- or zero-
+// extended to 32/64 bits.
+bool AIXABIInfo::isPromotableTypeForABI(QualType Ty) const {
+  // Treat an enum type as its underlying type.
+  if (const EnumType *EnumTy = Ty->getAs<EnumType>())
+    Ty = EnumTy->getDecl()->getIntegerType();
+
+  // Promotable integer types are required to be promoted by the ABI.
+  if (getContext().isPromotableIntegerType(Ty))
+    return true;
+
+  if (!Is64Bit)
+    return false;
+
+  // For 64 bit mode, in addition to the usual promotable integer types, we also
+  // need to extend all 32-bit types, since the ABI requires promotion to 64
+  // bits.
+  if (const BuiltinType *BT = Ty->getAs<BuiltinType>())
+    switch (BT->getKind()) {
+    case BuiltinType::Int:
+    case BuiltinType::UInt:
+      return true;
+    default:
+      break;
+    }
+
+  return false;
+}
+
+ABIArgInfo AIXABIInfo::classifyReturnType(QualType RetTy) const {
+  if (RetTy->isAnyComplexType())
+    return ABIArgInfo::getDirect();
+
+  if (RetTy->isVectorType())
+    return ABIArgInfo::getDirect();
+
+  if (RetTy->isVoidType())
+    return ABIArgInfo::getIgnore();
+
+  if (isAggregateTypeForABI(RetTy))
+    return getNaturalAlignIndirect(RetTy);
+
+  return (isPromotableTypeForABI(RetTy) ? ABIArgInfo::getExtend(RetTy)
+                                        : ABIArgInfo::getDirect());
+}
+
+ABIArgInfo AIXABIInfo::classifyArgumentType(QualType Ty) const {
+  Ty = useFirstFieldIfTransparentUnion(Ty);
+
+  if (Ty->isAnyComplexType())
+    return ABIArgInfo::getDirect();
+
+  if (Ty->isVectorType())
+    return ABIArgInfo::getDirect();
+
+  if (isAggregateTypeForABI(Ty)) {
+    // Records with non-trivial destructors/copy-constructors should not be
+    // passed by value.
+    if (CGCXXABI::RecordArgABI RAA = getRecordArgABI(Ty, getCXXABI()))
+      return getNaturalAlignIndirect(Ty, RAA == CGCXXABI::RAA_DirectInMemory);
+
+    CharUnits CCAlign = getParamTypeAlignment(Ty);
+    CharUnits TyAlign = getContext().getTypeAlignInChars(Ty);
+
+    return ABIArgInfo::getIndirect(CCAlign, /*ByVal*/ true,
+                                   /*Realign*/ TyAlign > CCAlign);
+  }
+
+  return (isPromotableTypeForABI(Ty) ? ABIArgInfo::getExtend(Ty)
+                                     : ABIArgInfo::getDirect());
+}
+
+CharUnits AIXABIInfo::getParamTypeAlignment(QualType Ty) const {
+  // Complex types are passed just like their elements.
+  if (const ComplexType *CTy = Ty->getAs<ComplexType>())
+    Ty = CTy->getElementType();
+
+  if (Ty->isVectorType())
+    return CharUnits::fromQuantity(16);
+
+  // If the structure contains a vector type, the alignment is 16.
+  if (isRecordWithSIMDVectorType(getContext(), Ty))
+    return CharUnits::fromQuantity(16);
+
+  return CharUnits::fromQuantity(PtrByteSize);
+}
+
+Address AIXABIInfo::EmitVAArg(CodeGenFunction &CGF, Address VAListAddr,
+                              QualType Ty) const {
+
+  auto TypeInfo = getContext().getTypeInfoInChars(Ty);
+  TypeInfo.Align = getParamTypeAlignment(Ty);
+
+  CharUnits SlotSize = CharUnits::fromQuantity(PtrByteSize);
+
+  // If we have a complex type and the base type is smaller than the register
+  // size, the ABI calls for the real and imaginary parts to be right-adjusted
+  // in separate words in 32bit mode or doublewords in 64bit mode. However,
+  // Clang expects us to produce a pointer to a structure with the two parts
+  // packed tightly. So generate loads of the real and imaginary parts relative
+  // to the va_list pointer, and store them to a temporary structure. We do the
+  // same as the PPC64ABI here.
+  if (const ComplexType *CTy = Ty->getAs<ComplexType>()) {
+    CharUnits EltSize = TypeInfo.Width / 2;
+    if (EltSize < SlotSize)
+      return complexTempStructure(CGF, VAListAddr, Ty, SlotSize, EltSize, CTy);
+  }
+
+  return emitVoidPtrVAArg(CGF, VAListAddr, Ty, /*Indirect*/ false, TypeInfo,
+                          SlotSize, /*AllowHigher*/ true);
+}
+
+AIXTargetCodeGenInfo::AIXTargetCodeGenInfo(CodeGenTypes &CGT, bool Is64Bit)
+    : TargetCodeGenInfo(std::make_unique<AIXABIInfo>(CGT, Is64Bit)),
+      Is64Bit(Is64Bit) {}
+
+bool AIXTargetCodeGenInfo::initDwarfEHRegSizeTable(
+    CodeGen::CodeGenFunction &CGF, llvm::Value *Address) const {
+  return PPC_initDwarfEHRegSizeTable(CGF, Address, Is64Bit, /*IsAIX*/ true);
+}
+
+// PowerPC-32
+namespace {
+/// PPC32_SVR4_ABIInfo - The 32-bit PowerPC ELF (SVR4) ABI information.
+class PPC32_SVR4_ABIInfo : public DefaultABIInfo {
+  bool IsSoftFloatABI;
+  bool IsRetSmallStructInRegABI;
+
+  CharUnits getParamTypeAlignment(QualType Ty) const;
+
+public:
+  PPC32_SVR4_ABIInfo(CodeGen::CodeGenTypes &CGT, bool SoftFloatABI,
+                     bool RetSmallStructInRegABI)
+      : DefaultABIInfo(CGT), IsSoftFloatABI(SoftFloatABI),
+        IsRetSmallStructInRegABI(RetSmallStructInRegABI) {}
+
+  ABIArgInfo classifyReturnType(QualType RetTy) const;
+
+  void computeInfo(CGFunctionInfo &FI) const override {
+    if (!getCXXABI().classifyReturnType(FI))
+      FI.getReturnInfo() = classifyReturnType(FI.getReturnType());
+    for (auto &I : FI.arguments())
+      I.info = classifyArgumentType(I.type);
+  }
+
+  Address EmitVAArg(CodeGenFunction &CGF, Address VAListAddr,
+                    QualType Ty) const override;
+};
+} // namespace
+
+PPC32TargetCodeGenInfo::PPC32TargetCodeGenInfo(CodeGenTypes &CGT,
+                                               bool SoftFloatABI,
+                                               bool RetSmallStructInRegABI)
+    : TargetCodeGenInfo(std::make_unique<PPC32_SVR4_ABIInfo>(
+          CGT, SoftFloatABI, RetSmallStructInRegABI)) {}
+
+CharUnits PPC32_SVR4_ABIInfo::getParamTypeAlignment(QualType Ty) const {
+  // Complex types are passed just like their elements.
+  if (const ComplexType *CTy = Ty->getAs<ComplexType>())
+    Ty = CTy->getElementType();
+
+  if (Ty->isVectorType())
+    return CharUnits::fromQuantity(getContext().getTypeSize(Ty) == 128 ? 16
+                                                                       : 4);
+
+  // For single-element float/vector structs, we consider the whole type
+  // to have the same alignment requirements as its single element.
+  const Type *AlignTy = nullptr;
+  if (const Type *EltType = isSingleElementStruct(Ty, getContext())) {
+    const BuiltinType *BT = EltType->getAs<BuiltinType>();
+    if ((EltType->isVectorType() && getContext().getTypeSize(EltType) == 128) ||
+        (BT && BT->isFloatingPoint()))
+      AlignTy = EltType;
+  }
+
+  if (AlignTy)
+    return CharUnits::fromQuantity(AlignTy->isVectorType() ? 16 : 4);
+  return CharUnits::fromQuantity(4);
+}
+
+ABIArgInfo PPC32_SVR4_ABIInfo::classifyReturnType(QualType RetTy) const {
+  uint64_t Size;
+
+  // -msvr4-struct-return puts small aggregates in GPR3 and GPR4.
+  if (isAggregateTypeForABI(RetTy) && IsRetSmallStructInRegABI &&
+      (Size = getContext().getTypeSize(RetTy)) <= 64) {
+    // System V ABI (1995), page 3-22, specified:
+    // > A structure or union whose size is less than or equal to 8 bytes
+    // > shall be returned in r3 and r4, as if it were first stored in the
+    // > 8-byte aligned memory area and then the low addressed word were
+    // > loaded into r3 and the high-addressed word into r4.  Bits beyond
+    // > the last member of the structure or union are not defined.
+    //
+    // GCC for big-endian PPC32 inserts the pad before the first member,
+    // not "beyond the last member" of the struct.  To stay compatible
+    // with GCC, we coerce the struct to an integer of the same size.
+    // LLVM will extend it and return i32 in r3, or i64 in r3:r4.
+    if (Size == 0)
+      return ABIArgInfo::getIgnore();
+    else {
+      llvm::Type *CoerceTy = llvm::Type::getIntNTy(getVMContext(), Size);
+      return ABIArgInfo::getDirect(CoerceTy);
+    }
+  }
+
+  return DefaultABIInfo::classifyReturnType(RetTy);
+}
+
+// TODO: this implementation is now likely redundant with
+// DefaultABIInfo::EmitVAArg.
+Address PPC32_SVR4_ABIInfo::EmitVAArg(CodeGenFunction &CGF, Address VAList,
+                                      QualType Ty) const {
+  if (getTarget().getTriple().isOSDarwin()) {
+    auto TI = getContext().getTypeInfoInChars(Ty);
+    TI.Align = getParamTypeAlignment(Ty);
+
+    CharUnits SlotSize = CharUnits::fromQuantity(4);
+    return emitVoidPtrVAArg(CGF, VAList, Ty,
+                            classifyArgumentType(Ty).isIndirect(), TI, SlotSize,
+                            /*AllowHigherAlign=*/true);
+  }
+
+  const unsigned OverflowLimit = 8;
+  if (const ComplexType *CTy = Ty->getAs<ComplexType>()) {
+    // TODO: Implement this. For now ignore.
+    (void)CTy;
+    return Address::invalid(); // FIXME?
+  }
+
+  // struct __va_list_tag {
+  //   unsigned char gpr;
+  //   unsigned char fpr;
+  //   unsigned short reserved;
+  //   void *overflow_arg_area;
+  //   void *reg_save_area;
+  // };
+
+  bool isI64 = Ty->isIntegerType() && getContext().getTypeSize(Ty) == 64;
+  bool isInt = !Ty->isFloatingType();
+  bool isF64 = Ty->isFloatingType() && getContext().getTypeSize(Ty) == 64;
+
+  // All aggregates are passed indirectly?  That doesn't seem consistent
+  // with the argument-lowering code.
+  bool isIndirect = isAggregateTypeForABI(Ty);
+
+  CGBuilderTy &Builder = CGF.Builder;
+
+  // The calling convention either uses 1-2 GPRs or 1 FPR.
+  Address NumRegsAddr = Address::invalid();
+  if (isInt || IsSoftFloatABI) {
+    NumRegsAddr = Builder.CreateStructGEP(VAList, 0, "gpr");
+  } else {
+    NumRegsAddr = Builder.CreateStructGEP(VAList, 1, "fpr");
+  }
+
+  llvm::Value *NumRegs = Builder.CreateLoad(NumRegsAddr, "numUsedRegs");
+
+  // "Align" the register count when TY is i64.
+  if (isI64 || (isF64 && IsSoftFloatABI)) {
+    NumRegs = Builder.CreateAdd(NumRegs, Builder.getInt8(1));
+    NumRegs = Builder.CreateAnd(NumRegs, Builder.getInt8((uint8_t)~1U));
+  }
+
+  llvm::Value *CC =
+      Builder.CreateICmpULT(NumRegs, Builder.getInt8(OverflowLimit), "cond");
+
+  llvm::BasicBlock *UsingRegs = CGF.createBasicBlock("using_regs");
+  llvm::BasicBlock *UsingOverflow = CGF.createBasicBlock("using_overflow");
+  llvm::BasicBlock *Cont = CGF.createBasicBlock("cont");
+
+  Builder.CreateCondBr(CC, UsingRegs, UsingOverflow);
+
+  llvm::Type *DirectTy = CGF.ConvertType(Ty), *ElementTy = DirectTy;
+  if (isIndirect)
+    DirectTy = DirectTy->getPointerTo(0);
+
+  // Case 1: consume registers.
+  Address RegAddr = Address::invalid();
+  {
+    CGF.EmitBlock(UsingRegs);
+
+    Address RegSaveAreaPtr = Builder.CreateStructGEP(VAList, 4);
+    RegAddr = Address(Builder.CreateLoad(RegSaveAreaPtr), CGF.Int8Ty,
+                      CharUnits::fromQuantity(8));
+    assert(RegAddr.getElementType() == CGF.Int8Ty);
+
+    // Floating-point registers start after the general-purpose registers.
+    if (!(isInt || IsSoftFloatABI)) {
+      RegAddr = Builder.CreateConstInBoundsByteGEP(RegAddr,
+                                                   CharUnits::fromQuantity(32));
+    }
+
+    // Get the address of the saved value by scaling the number of
+    // registers we've used by the number of
+    CharUnits RegSize =
+        CharUnits::fromQuantity((isInt || IsSoftFloatABI) ? 4 : 8);
+    llvm::Value *RegOffset =
+        Builder.CreateMul(NumRegs, Builder.getInt8(RegSize.getQuantity()));
+    RegAddr = Address(
+        Builder.CreateInBoundsGEP(CGF.Int8Ty, RegAddr.getPointer(), RegOffset),
+        CGF.Int8Ty, RegAddr.getAlignment().alignmentOfArrayElement(RegSize));
+    RegAddr = Builder.CreateElementBitCast(RegAddr, DirectTy);
+
+    // Increase the used-register count.
+    NumRegs = Builder.CreateAdd(
+        NumRegs, Builder.getInt8((isI64 || (isF64 && IsSoftFloatABI)) ? 2 : 1));
+    Builder.CreateStore(NumRegs, NumRegsAddr);
+
+    CGF.EmitBranch(Cont);
+  }
+
+  // Case 2: consume space in the overflow area.
+  Address MemAddr = Address::invalid();
+  {
+    CGF.EmitBlock(UsingOverflow);
+
+    Builder.CreateStore(Builder.getInt8(OverflowLimit), NumRegsAddr);
+
+    // Everything in the overflow area is rounded up to a size of at least 4.
+    CharUnits OverflowAreaAlign = CharUnits::fromQuantity(4);
+
+    CharUnits Size;
+    if (!isIndirect) {
+      auto TypeInfo = CGF.getContext().getTypeInfoInChars(Ty);
+      Size = TypeInfo.Width.alignTo(OverflowAreaAlign);
+    } else {
+      Size = CGF.getPointerSize();
+    }
+
+    Address OverflowAreaAddr = Builder.CreateStructGEP(VAList, 3);
+    Address OverflowArea =
+        Address(Builder.CreateLoad(OverflowAreaAddr, "argp.cur"), CGF.Int8Ty,
+                OverflowAreaAlign);
+    // Round up address of argument to alignment
+    CharUnits Align = CGF.getContext().getTypeAlignInChars(Ty);
+    if (Align > OverflowAreaAlign) {
+      llvm::Value *Ptr = OverflowArea.getPointer();
+      OverflowArea = Address(emitRoundPointerUpToAlignment(CGF, Ptr, Align),
+                             OverflowArea.getElementType(), Align);
+    }
+
+    MemAddr = Builder.CreateElementBitCast(OverflowArea, DirectTy);
+
+    // Increase the overflow area.
+    OverflowArea = Builder.CreateConstInBoundsByteGEP(OverflowArea, Size);
+    Builder.CreateStore(OverflowArea.getPointer(), OverflowAreaAddr);
+    CGF.EmitBranch(Cont);
+  }
+
+  CGF.EmitBlock(Cont);
+
+  // Merge the cases with a phi.
+  Address Result = emitMergePHI(CGF, RegAddr, UsingRegs, MemAddr, UsingOverflow,
+                                "vaarg.addr");
+
+  // Load the pointer if the argument was passed indirectly.
+  if (isIndirect) {
+    Result = Address(Builder.CreateLoad(Result, "aggr"), ElementTy,
+                     getContext().getTypeAlignInChars(Ty));
+  }
+
+  return Result;
+}
+
+bool PPC32TargetCodeGenInfo::isStructReturnInRegABI(
+    const llvm::Triple &Triple, const CodeGenOptions &Opts) {
+  assert(Triple.isPPC32());
+
+  switch (Opts.getStructReturnConvention()) {
+  case CodeGenOptions::SRCK_Default:
+    break;
+  case CodeGenOptions::SRCK_OnStack: // -maix-struct-return
+    return false;
+  case CodeGenOptions::SRCK_InRegs: // -msvr4-struct-return
+    return true;
+  }
+
+  if (Triple.isOSBinFormatELF() && !Triple.isOSLinux())
+    return true;
+
+  return false;
+}
+
+bool PPC32TargetCodeGenInfo::initDwarfEHRegSizeTable(
+    CodeGen::CodeGenFunction &CGF, llvm::Value *Address) const {
+  return PPC_initDwarfEHRegSizeTable(CGF, Address, /*Is64Bit*/ false,
+                                     /*IsAIX*/ false);
+}
+
+// PowerPC-64
+
+namespace {
+/// PPC64_SVR4_ABIInfo - The 64-bit PowerPC ELF (SVR4) ABI information.
+class PPC64_SVR4_ABIInfo : public ABIInfo {
+  static const unsigned GPRBits = 64;
+  PPC64_SVR4_ABIKind Kind;
+  bool IsSoftFloatABI;
+
+public:
+  PPC64_SVR4_ABIInfo(CodeGen::CodeGenTypes &CGT, PPC64_SVR4_ABIKind Kind,
+                     bool SoftFloatABI)
+      : ABIInfo(CGT), Kind(Kind), IsSoftFloatABI(SoftFloatABI) {}
+
+  bool isPromotableTypeForABI(QualType Ty) const;
+  CharUnits getParamTypeAlignment(QualType Ty) const;
+
+  ABIArgInfo classifyReturnType(QualType RetTy) const;
+  ABIArgInfo classifyArgumentType(QualType Ty) const;
+
+  bool isHomogeneousAggregateBaseType(QualType Ty) const override;
+  bool isHomogeneousAggregateSmallEnough(const Type *Ty,
+                                         uint64_t Members) const override;
+
+  // TODO: We can add more logic to computeInfo to improve performance.
+  // Example: For aggregate arguments that fit in a register, we could
+  // use getDirectInReg (as is done below for structs containing a single
+  // floating-point value) to avoid pushing them to memory on function
+  // entry.  This would require changing the logic in PPCISelLowering
+  // when lowering the parameters in the caller and args in the callee.
+  void computeInfo(CGFunctionInfo &FI) const override {
+    if (!getCXXABI().classifyReturnType(FI))
+      FI.getReturnInfo() = classifyReturnType(FI.getReturnType());
+    for (auto &I : FI.arguments()) {
+      // We rely on the default argument classification for the most part.
+      // One exception:  An aggregate containing a single floating-point
+      // or vector item must be passed in a register if one is available.
+      const Type *T = isSingleElementStruct(I.type, getContext());
+      if (T) {
+        const BuiltinType *BT = T->getAs<BuiltinType>();
+        if ((T->isVectorType() && getContext().getTypeSize(T) == 128) ||
+            (BT && BT->isFloatingPoint())) {
+          QualType QT(T, 0);
+          I.info = ABIArgInfo::getDirectInReg(CGT.ConvertType(QT));
+          continue;
+        }
+      }
+      I.info = classifyArgumentType(I.type);
+    }
+  }
+
+  Address EmitVAArg(CodeGenFunction &CGF, Address VAListAddr,
+                    QualType Ty) const override;
+};
+} // namespace
+
+// Return true if the ABI requires Ty to be passed sign- or zero-
+// extended to 64 bits.
+bool PPC64_SVR4_ABIInfo::isPromotableTypeForABI(QualType Ty) const {
+  // Treat an enum type as its underlying type.
+  if (const EnumType *EnumTy = Ty->getAs<EnumType>())
+    Ty = EnumTy->getDecl()->getIntegerType();
+
+  // Promotable integer types are required to be promoted by the ABI.
+  if (isPromotableIntegerTypeForABI(Ty))
+    return true;
+
+  // In addition to the usual promotable integer types, we also need to
+  // extend all 32-bit types, since the ABI requires promotion to 64 bits.
+  if (const BuiltinType *BT = Ty->getAs<BuiltinType>())
+    switch (BT->getKind()) {
+    case BuiltinType::Int:
+    case BuiltinType::UInt:
+      return true;
+    default:
+      break;
+    }
+
+  if (const auto *EIT = Ty->getAs<BitIntType>())
+    if (EIT->getNumBits() < 64)
+      return true;
+
+  return false;
+}
+
+/// isAlignedParamType - Determine whether a type requires 16-byte or
+/// higher alignment in the parameter area.  Always returns at least 8.
+CharUnits PPC64_SVR4_ABIInfo::getParamTypeAlignment(QualType Ty) const {
+  // Complex types are passed just like their elements.
+  if (const ComplexType *CTy = Ty->getAs<ComplexType>())
+    Ty = CTy->getElementType();
+
+  auto FloatUsesVector = [this](QualType Ty) {
+    return Ty->isRealFloatingType() && &getContext().getFloatTypeSemantics(
+                                           Ty) == &llvm::APFloat::IEEEquad();
+  };
+
+  // Only vector types of size 16 bytes need alignment (larger types are
+  // passed via reference, smaller types are not aligned).
+  if (Ty->isVectorType()) {
+    return CharUnits::fromQuantity(getContext().getTypeSize(Ty) == 128 ? 16
+                                                                       : 8);
+  } else if (FloatUsesVector(Ty)) {
+    // According to ABI document section 'Optional Save Areas': If extended
+    // precision floating-point values in IEEE BINARY 128 QUADRUPLE PRECISION
+    // format are supported, map them to a single quadword, quadword aligned.
+    return CharUnits::fromQuantity(16);
+  }
+
+  // For single-element float/vector structs, we consider the whole type
+  // to have the same alignment requirements as its single element.
+  const Type *AlignAsType = nullptr;
+  const Type *EltType = isSingleElementStruct(Ty, getContext());
+  if (EltType) {
+    const BuiltinType *BT = EltType->getAs<BuiltinType>();
+    if ((EltType->isVectorType() && getContext().getTypeSize(EltType) == 128) ||
+        (BT && BT->isFloatingPoint()))
+      AlignAsType = EltType;
+  }
+
+  // Likewise for ELFv2 homogeneous aggregates.
+  const Type *Base = nullptr;
+  uint64_t Members = 0;
+  if (!AlignAsType && Kind == PPC64_SVR4_ABIKind::ELFv2 &&
+      isAggregateTypeForABI(Ty) && isHomogeneousAggregate(Ty, Base, Members))
+    AlignAsType = Base;
+
+  // With special case aggregates, only vector base types need alignment.
+  if (AlignAsType) {
+    bool UsesVector = AlignAsType->isVectorType() ||
+                      FloatUsesVector(QualType(AlignAsType, 0));
+    return CharUnits::fromQuantity(UsesVector ? 16 : 8);
+  }
+
+  // Otherwise, we only need alignment for any aggregate type that
+  // has an alignment requirement of >= 16 bytes.
+  if (isAggregateTypeForABI(Ty) && getContext().getTypeAlign(Ty) >= 128) {
+    return CharUnits::fromQuantity(16);
+  }
+
+  return CharUnits::fromQuantity(8);
+}
+
+/// isHomogeneousAggregate - Return true if a type is an ELFv2 homogeneous
+/// aggregate.  Base is set to the base element type, and Members is set
+/// to the number of base elements.
+bool ABIInfo::isHomogeneousAggregate(QualType Ty, const Type *&Base,
+                                     uint64_t &Members) const {
+  if (const ConstantArrayType *AT = getContext().getAsConstantArrayType(Ty)) {
+    uint64_t NElements = AT->getSize().getZExtValue();
+    if (NElements == 0)
+      return false;
+    if (!isHomogeneousAggregate(AT->getElementType(), Base, Members))
+      return false;
+    Members *= NElements;
+  } else if (const RecordType *RT = Ty->getAs<RecordType>()) {
+    const RecordDecl *RD = RT->getDecl();
+    if (RD->hasFlexibleArrayMember())
+      return false;
+
+    Members = 0;
+
+    // If this is a C++ record, check the properties of the record such as
+    // bases and ABI specific restrictions
+    if (const CXXRecordDecl *CXXRD = dyn_cast<CXXRecordDecl>(RD)) {
+      if (!getCXXABI().isPermittedToBeHomogeneousAggregate(CXXRD))
+        return false;
+
+      for (const auto &I : CXXRD->bases()) {
+        // Ignore empty records.
+        if (isEmptyRecord(getContext(), I.getType(), true))
+          continue;
+
+        uint64_t FldMembers;
+        if (!isHomogeneousAggregate(I.getType(), Base, FldMembers))
+          return false;
+
+        Members += FldMembers;
+      }
+    }
+
+    for (const auto *FD : RD->fields()) {
+      // Ignore (non-zero arrays of) empty records.
+      QualType FT = FD->getType();
+      while (const ConstantArrayType *AT =
+                 getContext().getAsConstantArrayType(FT)) {
+        if (AT->getSize().getZExtValue() == 0)
+          return false;
+        FT = AT->getElementType();
+      }
+      if (isEmptyRecord(getContext(), FT, true))
+        continue;
+
+      if (isZeroLengthBitfieldPermittedInHomogeneousAggregate() &&
+          FD->isZeroLengthBitField(getContext()))
+        continue;
+
+      uint64_t FldMembers;
+      if (!isHomogeneousAggregate(FD->getType(), Base, FldMembers))
+        return false;
+
+      Members = (RD->isUnion() ? std::max(Members, FldMembers)
+                               : Members + FldMembers);
+    }
+
+    if (!Base)
+      return false;
+
+    // Ensure there is no padding.
+    if (getContext().getTypeSize(Base) * Members !=
+        getContext().getTypeSize(Ty))
+      return false;
+  } else {
+    Members = 1;
+    if (const ComplexType *CT = Ty->getAs<ComplexType>()) {
+      Members = 2;
+      Ty = CT->getElementType();
+    }
+
+    // Most ABIs only support float, double, and some vector type widths.
+    if (!isHomogeneousAggregateBaseType(Ty))
+      return false;
+
+    // The base type must be the same for all members.  Types that
+    // agree in both total size and mode (float vs. vector) are
+    // treated as being equivalent here.
+    const Type *TyPtr = Ty.getTypePtr();
+    if (!Base) {
+      Base = TyPtr;
+      // If it's a non-power-of-2 vector, its size is already a power-of-2,
+      // so make sure to widen it explicitly.
+      if (const VectorType *VT = Base->getAs<VectorType>()) {
+        QualType EltTy = VT->getElementType();
+        unsigned NumElements =
+            getContext().getTypeSize(VT) / getContext().getTypeSize(EltTy);
+        Base = getContext()
+                   .getVectorType(EltTy, NumElements, VT->getVectorKind())
+                   .getTypePtr();
+      }
+    }
+
+    if (Base->isVectorType() != TyPtr->isVectorType() ||
+        getContext().getTypeSize(Base) != getContext().getTypeSize(TyPtr))
+      return false;
+  }
+  return Members > 0 && isHomogeneousAggregateSmallEnough(Base, Members);
+}
+
+bool PPC64_SVR4_ABIInfo::isHomogeneousAggregateBaseType(QualType Ty) const {
+  // Homogeneous aggregates for ELFv2 must have base types of float,
+  // double, long double, or 128-bit vectors.
+  if (const BuiltinType *BT = Ty->getAs<BuiltinType>()) {
+    if (BT->getKind() == BuiltinType::Float ||
+        BT->getKind() == BuiltinType::Double ||
+        BT->getKind() == BuiltinType::LongDouble ||
+        BT->getKind() == BuiltinType::Ibm128 ||
+        (getContext().getTargetInfo().hasFloat128Type() &&
+         (BT->getKind() == BuiltinType::Float128))) {
+      if (IsSoftFloatABI)
+        return false;
+      return true;
+    }
+  }
+  if (const VectorType *VT = Ty->getAs<VectorType>()) {
+    if (getContext().getTypeSize(VT) == 128)
+      return true;
+  }
+  return false;
+}
+
+bool PPC64_SVR4_ABIInfo::isHomogeneousAggregateSmallEnough(
+    const Type *Base, uint64_t Members) const {
+  // Vector and fp128 types require one register, other floating point types
+  // require one or two registers depending on their size.
+  uint32_t NumRegs = ((getContext().getTargetInfo().hasFloat128Type() &&
+                       Base->isFloat128Type()) ||
+                      Base->isVectorType())
+                         ? 1
+                         : (getContext().getTypeSize(Base) + 63) / 64;
+
+  // Homogeneous Aggregates may occupy at most 8 registers.
+  return Members * NumRegs <= 8;
+}
+
+ABIArgInfo PPC64_SVR4_ABIInfo::classifyArgumentType(QualType Ty) const {
+  Ty = useFirstFieldIfTransparentUnion(Ty);
+
+  if (Ty->isAnyComplexType())
+    return ABIArgInfo::getDirect();
+
+  // Non-Altivec vector types are passed in GPRs (smaller than 16 bytes)
+  // or via reference (larger than 16 bytes).
+  if (Ty->isVectorType()) {
+    uint64_t Size = getContext().getTypeSize(Ty);
+    if (Size > 128)
+      return getNaturalAlignIndirect(Ty, /*ByVal=*/false);
+    else if (Size < 128) {
+      llvm::Type *CoerceTy = llvm::IntegerType::get(getVMContext(), Size);
+      return ABIArgInfo::getDirect(CoerceTy);
+    }
+  }
+
+  if (const auto *EIT = Ty->getAs<BitIntType>())
+    if (EIT->getNumBits() > 128)
+      return getNaturalAlignIndirect(Ty, /*ByVal=*/true);
+
+  if (isAggregateTypeForABI(Ty)) {
+    if (CGCXXABI::RecordArgABI RAA = getRecordArgABI(Ty, getCXXABI()))
+      return getNaturalAlignIndirect(Ty, RAA == CGCXXABI::RAA_DirectInMemory);
+
+    uint64_t ABIAlign = getParamTypeAlignment(Ty).getQuantity();
+    uint64_t TyAlign = getContext().getTypeAlignInChars(Ty).getQuantity();
+
+    // ELFv2 homogeneous aggregates are passed as array types.
+    const Type *Base = nullptr;
+    uint64_t Members = 0;
+    if (Kind == PPC64_SVR4_ABIKind::ELFv2 &&
+        isHomogeneousAggregate(Ty, Base, Members)) {
+      llvm::Type *BaseTy = CGT.ConvertType(QualType(Base, 0));
+      llvm::Type *CoerceTy = llvm::ArrayType::get(BaseTy, Members);
+      return ABIArgInfo::getDirect(CoerceTy);
+    }
+
+    // If an aggregate may end up fully in registers, we do not
+    // use the ByVal method, but pass the aggregate as array.
+    // This is usually beneficial since we avoid forcing the
+    // back-end to store the argument to memory.
+    uint64_t Bits = getContext().getTypeSize(Ty);
+    if (Bits > 0 && Bits <= 8 * GPRBits) {
+      llvm::Type *CoerceTy;
+
+      // Types up to 8 bytes are passed as integer type (which will be
+      // properly aligned in the argument save area doubleword).
+      if (Bits <= GPRBits)
+        CoerceTy =
+            llvm::IntegerType::get(getVMContext(), llvm::alignTo(Bits, 8));
+      // Larger types are passed as arrays, with the base type selected
+      // according to the required alignment in the save area.
+      else {
+        uint64_t RegBits = ABIAlign * 8;
+        uint64_t NumRegs = llvm::alignTo(Bits, RegBits) / RegBits;
+        llvm::Type *RegTy = llvm::IntegerType::get(getVMContext(), RegBits);
+        CoerceTy = llvm::ArrayType::get(RegTy, NumRegs);
+      }
+
+      return ABIArgInfo::getDirect(CoerceTy);
+    }
+
+    // All other aggregates are passed ByVal.
+    return ABIArgInfo::getIndirect(CharUnits::fromQuantity(ABIAlign),
+                                   /*ByVal=*/true,
+                                   /*Realign=*/TyAlign > ABIAlign);
+  }
+
+  return (isPromotableTypeForABI(Ty) ? ABIArgInfo::getExtend(Ty)
+                                     : ABIArgInfo::getDirect());
+}
+
+ABIArgInfo PPC64_SVR4_ABIInfo::classifyReturnType(QualType RetTy) const {
+  if (RetTy->isVoidType())
+    return ABIArgInfo::getIgnore();
+
+  if (RetTy->isAnyComplexType())
+    return ABIArgInfo::getDirect();
+
+  // Non-Altivec vector types are returned in GPRs (smaller than 16 bytes)
+  // or via reference (larger than 16 bytes).
+  if (RetTy->isVectorType()) {
+    uint64_t Size = getContext().getTypeSize(RetTy);
+    if (Size > 128)
+      return getNaturalAlignIndirect(RetTy);
+    else if (Size < 128) {
+      llvm::Type *CoerceTy = llvm::IntegerType::get(getVMContext(), Size);
+      return ABIArgInfo::getDirect(CoerceTy);
+    }
+  }
+
+  if (const auto *EIT = RetTy->getAs<BitIntType>())
+    if (EIT->getNumBits() > 128)
+      return getNaturalAlignIndirect(RetTy, /*ByVal=*/false);
+
+  if (isAggregateTypeForABI(RetTy)) {
+    // ELFv2 homogeneous aggregates are returned as array types.
+    const Type *Base = nullptr;
+    uint64_t Members = 0;
+    if (Kind == PPC64_SVR4_ABIKind::ELFv2 &&
+        isHomogeneousAggregate(RetTy, Base, Members)) {
+      llvm::Type *BaseTy = CGT.ConvertType(QualType(Base, 0));
+      llvm::Type *CoerceTy = llvm::ArrayType::get(BaseTy, Members);
+      return ABIArgInfo::getDirect(CoerceTy);
+    }
+
+    // ELFv2 small aggregates are returned in up to two registers.
+    uint64_t Bits = getContext().getTypeSize(RetTy);
+    if (Kind == PPC64_SVR4_ABIKind::ELFv2 && Bits <= 2 * GPRBits) {
+      if (Bits == 0)
+        return ABIArgInfo::getIgnore();
+
+      llvm::Type *CoerceTy;
+      if (Bits > GPRBits) {
+        CoerceTy = llvm::IntegerType::get(getVMContext(), GPRBits);
+        CoerceTy = llvm::StructType::get(CoerceTy, CoerceTy);
+      } else
+        CoerceTy =
+            llvm::IntegerType::get(getVMContext(), llvm::alignTo(Bits, 8));
+      return ABIArgInfo::getDirect(CoerceTy);
+    }
+
+    // All other aggregates are returned indirectly.
+    return getNaturalAlignIndirect(RetTy);
+  }
+
+  return (isPromotableTypeForABI(RetTy) ? ABIArgInfo::getExtend(RetTy)
+                                        : ABIArgInfo::getDirect());
+}
+
+// Based on ARMABIInfo::EmitVAArg, adjusted for 64-bit machine.
+Address PPC64_SVR4_ABIInfo::EmitVAArg(CodeGenFunction &CGF, Address VAListAddr,
+                                      QualType Ty) const {
+  auto TypeInfo = getContext().getTypeInfoInChars(Ty);
+  TypeInfo.Align = getParamTypeAlignment(Ty);
+
+  CharUnits SlotSize = CharUnits::fromQuantity(8);
+
+  // If we have a complex type and the base type is smaller than 8 bytes,
+  // the ABI calls for the real and imaginary parts to be right-adjusted
+  // in separate doublewords.  However, Clang expects us to produce a
+  // pointer to a structure with the two parts packed tightly.  So generate
+  // loads of the real and imaginary parts relative to the va_list pointer,
+  // and store them to a temporary structure.
+  if (const ComplexType *CTy = Ty->getAs<ComplexType>()) {
+    CharUnits EltSize = TypeInfo.Width / 2;
+    if (EltSize < SlotSize)
+      return complexTempStructure(CGF, VAListAddr, Ty, SlotSize, EltSize, CTy);
+  }
+
+  // Otherwise, just use the general rule.
+  //
+  // The PPC64 ABI passes some arguments in integer registers, even to variadic
+  // functions. To allow va_list to use the simple "void*" representation,
+  // variadic calls allocate space in the argument area for the integer argument
+  // registers, and variadic functions spill their integer argument registers to
+  // this area in their prologues. When aggregates smaller than a register are
+  // passed this way, they are passed in the least significant bits of the
+  // register, which means that after spilling on big-endian targets they will
+  // be right-aligned in their argument slot. This is uncommon; for a variety of
+  // reasons, other big-endian targets don't end up right-aligning aggregate
+  // types this way, and so right-alignment only applies to fundamental types.
+  // So on PPC64, we must force the use of right-alignment even for aggregates.
+  return emitVoidPtrVAArg(CGF, VAListAddr, Ty, /*Indirect*/ false, TypeInfo,
+                          SlotSize, /*AllowHigher*/ true,
+                          /*ForceRightAdjust*/ true);
+}
+
+PPC64_SVR4_TargetCodeGenInfo::PPC64_SVR4_TargetCodeGenInfo(
+    CodeGenTypes &CGT, PPC64_SVR4_ABIKind Kind, bool SoftFloatABI)
+    : TargetCodeGenInfo(
+          std::make_unique<PPC64_SVR4_ABIInfo>(CGT, Kind, SoftFloatABI)) {
+  SwiftInfo =
+      std::make_unique<SwiftABIInfo>(CGT, /*SwiftErrorInRegister=*/false);
+}
+
+bool PPC64_SVR4_TargetCodeGenInfo::initDwarfEHRegSizeTable(
+    CodeGen::CodeGenFunction &CGF, llvm::Value *Address) const {
+  return PPC_initDwarfEHRegSizeTable(CGF, Address, /*Is64Bit*/ true,
+                                     /*IsAIX*/ false);
+}
+
+PPC64TargetCodeGenInfo::PPC64TargetCodeGenInfo(CodeGenTypes &CGT)
+    : TargetCodeGenInfo(std::make_unique<DefaultABIInfo>(CGT)) {}
+
+bool PPC64TargetCodeGenInfo::initDwarfEHRegSizeTable(
+    CodeGen::CodeGenFunction &CGF, llvm::Value *Address) const {
+  return PPC_initDwarfEHRegSizeTable(CGF, Address, /*Is64Bit*/ true,
+                                     /*IsAIX*/ false);
+}

clang/lib/CodeGen/Targets/RISCV.h

+//===- RISCV.h --------------------------------------------------*- C++ -*-===//
+//
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
+//
+//===----------------------------------------------------------------------===//
+
+#ifndef LLVM_CLANG_LIB_CODEGEN_TARGETS_RISCV_H
+#define LLVM_CLANG_LIB_CODEGEN_TARGETS_RISCV_H
+
+#include "TargetInfo.h"
+
+namespace clang::CodeGen {
+
+class LLVM_LIBRARY_VISIBILITY RISCVTargetCodeGenInfo
+    : public TargetCodeGenInfo {
+public:
+  RISCVTargetCodeGenInfo(CodeGen::CodeGenTypes &CGT, unsigned XLen,
+                         unsigned FLen);
+
+  void setTargetAttributes(const Decl *D, llvm::GlobalValue *GV,
+                           CodeGen::CodeGenModule &CGM) const override;
+};
+
+} // namespace clang::CodeGen
+
+#endif // LLVM_CLANG_LIB_CODEGEN_TARGETS_RISCV_H

clang/lib/CodeGen/Targets/RISCV.cpp

+//===- RISCV.cpp ----------------------------------------------------------===//
+//
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
+//
+//===----------------------------------------------------------------------===//
+
+#include "RISCV.h"
+#include "ABIInfoImpl.h"
+#include "llvm/TargetParser/RISCVTargetParser.h"
+
+using namespace clang;
+using namespace clang::CodeGen;
+
+//===----------------------------------------------------------------------===//
+// RISC-V ABI Implementation
+//===----------------------------------------------------------------------===//
+
+namespace {
+class RISCVABIInfo : public DefaultABIInfo {
+private:
+  // Size of the integer ('x') registers in bits.
+  unsigned XLen;
+  // Size of the floating point ('f') registers in bits. Note that the target
+  // ISA might have a wider FLen than the selected ABI (e.g. an RV32IF target
+  // with soft float ABI has FLen==0).
+  unsigned FLen;
+  static const int NumArgGPRs = 8;
+  static const int NumArgFPRs = 8;
+  bool detectFPCCEligibleStructHelper(QualType Ty, CharUnits CurOff,
+                                      llvm::Type *&Field1Ty,
+                                      CharUnits &Field1Off,
+                                      llvm::Type *&Field2Ty,
+                                      CharUnits &Field2Off) const;
+
+public:
+  RISCVABIInfo(CodeGen::CodeGenTypes &CGT, unsigned XLen, unsigned FLen)
+      : DefaultABIInfo(CGT), XLen(XLen), FLen(FLen) {}
+
+  // DefaultABIInfo's classifyReturnType and classifyArgumentType are
+  // non-virtual, but computeInfo is virtual, so we overload it.
+  void computeInfo(CGFunctionInfo &FI) const override;
+
+  ABIArgInfo classifyArgumentType(QualType Ty, bool IsFixed, int &ArgGPRsLeft,
+                                  int &ArgFPRsLeft) const;
+  ABIArgInfo classifyReturnType(QualType RetTy) const;
+
+  Address EmitVAArg(CodeGenFunction &CGF, Address VAListAddr,
+                    QualType Ty) const override;
+
+  ABIArgInfo extendType(QualType Ty) const;
+
+  bool detectFPCCEligibleStruct(QualType Ty, llvm::Type *&Field1Ty,
+                                CharUnits &Field1Off, llvm::Type *&Field2Ty,
+                                CharUnits &Field2Off, int &NeededArgGPRs,
+                                int &NeededArgFPRs) const;
+  ABIArgInfo coerceAndExpandFPCCEligibleStruct(llvm::Type *Field1Ty,
+                                               CharUnits Field1Off,
+                                               llvm::Type *Field2Ty,
+                                               CharUnits Field2Off) const;
+
+  ABIArgInfo coerceVLSVector(QualType Ty) const;
+};
+} // end anonymous namespace
+
+void RISCVABIInfo::computeInfo(CGFunctionInfo &FI) const {
+  QualType RetTy = FI.getReturnType();
+  if (!getCXXABI().classifyReturnType(FI))
+    FI.getReturnInfo() = classifyReturnType(RetTy);
+
+  // IsRetIndirect is true if classifyArgumentType indicated the value should
+  // be passed indirect, or if the type size is a scalar greater than 2*XLen
+  // and not a complex type with elements <= FLen. e.g. fp128 is passed direct
+  // in LLVM IR, relying on the backend lowering code to rewrite the argument
+  // list and pass indirectly on RV32.
+  bool IsRetIndirect = FI.getReturnInfo().getKind() == ABIArgInfo::Indirect;
+  if (!IsRetIndirect && RetTy->isScalarType() &&
+      getContext().getTypeSize(RetTy) > (2 * XLen)) {
+    if (RetTy->isComplexType() && FLen) {
+      QualType EltTy = RetTy->castAs<ComplexType>()->getElementType();
+      IsRetIndirect = getContext().getTypeSize(EltTy) > FLen;
+    } else {
+      // This is a normal scalar > 2*XLen, such as fp128 on RV32.
+      IsRetIndirect = true;
+    }
+  }
+
+  int ArgGPRsLeft = IsRetIndirect ? NumArgGPRs - 1 : NumArgGPRs;
+  int ArgFPRsLeft = FLen ? NumArgFPRs : 0;
+  int NumFixedArgs = FI.getNumRequiredArgs();
+
+  int ArgNum = 0;
+  for (auto &ArgInfo : FI.arguments()) {
+    bool IsFixed = ArgNum < NumFixedArgs;
+    ArgInfo.info =
+        classifyArgumentType(ArgInfo.type, IsFixed, ArgGPRsLeft, ArgFPRsLeft);
+    ArgNum++;
+  }
+}
+
+// Returns true if the struct is a potential candidate for the floating point
+// calling convention. If this function returns true, the caller is
+// responsible for checking that if there is only a single field then that
+// field is a float.
+bool RISCVABIInfo::detectFPCCEligibleStructHelper(QualType Ty, CharUnits CurOff,
+                                                  llvm::Type *&Field1Ty,
+                                                  CharUnits &Field1Off,
+                                                  llvm::Type *&Field2Ty,
+                                                  CharUnits &Field2Off) const {
+  bool IsInt = Ty->isIntegralOrEnumerationType();
+  bool IsFloat = Ty->isRealFloatingType();
+
+  if (IsInt || IsFloat) {
+    uint64_t Size = getContext().getTypeSize(Ty);
+    if (IsInt && Size > XLen)
+      return false;
+    // Can't be eligible if larger than the FP registers. Handling of half
+    // precision values has been specified in the ABI, so don't block those.
+    if (IsFloat && Size > FLen)
+      return false;
+    // Can't be eligible if an integer type was already found (int+int pairs
+    // are not eligible).
+    if (IsInt && Field1Ty && Field1Ty->isIntegerTy())
+      return false;
+    if (!Field1Ty) {
+      Field1Ty = CGT.ConvertType(Ty);
+      Field1Off = CurOff;
+      return true;
+    }
+    if (!Field2Ty) {
+      Field2Ty = CGT.ConvertType(Ty);
+      Field2Off = CurOff;
+      return true;
+    }
+    return false;
+  }
+
+  if (auto CTy = Ty->getAs<ComplexType>()) {
+    if (Field1Ty)
+      return false;
+    QualType EltTy = CTy->getElementType();
+    if (getContext().getTypeSize(EltTy) > FLen)
+      return false;
+    Field1Ty = CGT.ConvertType(EltTy);
+    Field1Off = CurOff;
+    Field2Ty = Field1Ty;
+    Field2Off = Field1Off + getContext().getTypeSizeInChars(EltTy);
+    return true;
+  }
+
+  if (const ConstantArrayType *ATy = getContext().getAsConstantArrayType(Ty)) {
+    uint64_t ArraySize = ATy->getSize().getZExtValue();
+    QualType EltTy = ATy->getElementType();
+    CharUnits EltSize = getContext().getTypeSizeInChars(EltTy);
+    for (uint64_t i = 0; i < ArraySize; ++i) {
+      bool Ret = detectFPCCEligibleStructHelper(EltTy, CurOff, Field1Ty,
+                                                Field1Off, Field2Ty, Field2Off);
+      if (!Ret)
+        return false;
+      CurOff += EltSize;
+    }
+    return true;
+  }
+
+  if (const auto *RTy = Ty->getAs<RecordType>()) {
+    // Structures with either a non-trivial destructor or a non-trivial
+    // copy constructor are not eligible for the FP calling convention.
+    if (getRecordArgABI(Ty, CGT.getCXXABI()))
+      return false;
+    if (isEmptyRecord(getContext(), Ty, true))
+      return true;
+    const RecordDecl *RD = RTy->getDecl();
+    // Unions aren't eligible unless they're empty (which is caught above).
+    if (RD->isUnion())
+      return false;
+    const ASTRecordLayout &Layout = getContext().getASTRecordLayout(RD);
+    // If this is a C++ record, check the bases first.
+    if (const CXXRecordDecl *CXXRD = dyn_cast<CXXRecordDecl>(RD)) {
+      for (const CXXBaseSpecifier &B : CXXRD->bases()) {
+        const auto *BDecl =
+            cast<CXXRecordDecl>(B.getType()->castAs<RecordType>()->getDecl());
+        CharUnits BaseOff = Layout.getBaseClassOffset(BDecl);
+        bool Ret = detectFPCCEligibleStructHelper(B.getType(), CurOff + BaseOff,
+                                                  Field1Ty, Field1Off, Field2Ty,
+                                                  Field2Off);
+        if (!Ret)
+          return false;
+      }
+    }
+    int ZeroWidthBitFieldCount = 0;
+    for (const FieldDecl *FD : RD->fields()) {
+      uint64_t FieldOffInBits = Layout.getFieldOffset(FD->getFieldIndex());
+      QualType QTy = FD->getType();
+      if (FD->isBitField()) {
+        unsigned BitWidth = FD->getBitWidthValue(getContext());
+        // Allow a bitfield with a type greater than XLen as long as the
+        // bitwidth is XLen or less.
+        if (getContext().getTypeSize(QTy) > XLen && BitWidth <= XLen)
+          QTy = getContext().getIntTypeForBitwidth(XLen, false);
+        if (BitWidth == 0) {
+          ZeroWidthBitFieldCount++;
+          continue;
+        }
+      }
+
+      bool Ret = detectFPCCEligibleStructHelper(
+          QTy, CurOff + getContext().toCharUnitsFromBits(FieldOffInBits),
+          Field1Ty, Field1Off, Field2Ty, Field2Off);
+      if (!Ret)
+        return false;
+
+      // As a quirk of the ABI, zero-width bitfields aren't ignored for fp+fp
+      // or int+fp structs, but are ignored for a struct with an fp field and
+      // any number of zero-width bitfields.
+      if (Field2Ty && ZeroWidthBitFieldCount > 0)
+        return false;
+    }
+    return Field1Ty != nullptr;
+  }
+
+  return false;
+}
+
+// Determine if a struct is eligible for passing according to the floating
+// point calling convention (i.e., when flattened it contains a single fp
+// value, fp+fp, or int+fp of appropriate size). If so, NeededArgFPRs and
+// NeededArgGPRs are incremented appropriately.
+bool RISCVABIInfo::detectFPCCEligibleStruct(QualType Ty, llvm::Type *&Field1Ty,
+                                            CharUnits &Field1Off,
+                                            llvm::Type *&Field2Ty,
+                                            CharUnits &Field2Off,
+                                            int &NeededArgGPRs,
+                                            int &NeededArgFPRs) const {
+  Field1Ty = nullptr;
+  Field2Ty = nullptr;
+  NeededArgGPRs = 0;
+  NeededArgFPRs = 0;
+  bool IsCandidate = detectFPCCEligibleStructHelper(
+      Ty, CharUnits::Zero(), Field1Ty, Field1Off, Field2Ty, Field2Off);
+  // Not really a candidate if we have a single int but no float.
+  if (Field1Ty && !Field2Ty && !Field1Ty->isFloatingPointTy())
+    return false;
+  if (!IsCandidate)
+    return false;
+  if (Field1Ty && Field1Ty->isFloatingPointTy())
+    NeededArgFPRs++;
+  else if (Field1Ty)
+    NeededArgGPRs++;
+  if (Field2Ty && Field2Ty->isFloatingPointTy())
+    NeededArgFPRs++;
+  else if (Field2Ty)
+    NeededArgGPRs++;
+  return true;
+}
+
+// Call getCoerceAndExpand for the two-element flattened struct described by
+// Field1Ty, Field1Off, Field2Ty, Field2Off. This method will create an
+// appropriate coerceToType and unpaddedCoerceToType.
+ABIArgInfo RISCVABIInfo::coerceAndExpandFPCCEligibleStruct(
+    llvm::Type *Field1Ty, CharUnits Field1Off, llvm::Type *Field2Ty,
+    CharUnits Field2Off) const {
+  SmallVector<llvm::Type *, 3> CoerceElts;
+  SmallVector<llvm::Type *, 2> UnpaddedCoerceElts;
+  if (!Field1Off.isZero())
+    CoerceElts.push_back(llvm::ArrayType::get(
+        llvm::Type::getInt8Ty(getVMContext()), Field1Off.getQuantity()));
+
+  CoerceElts.push_back(Field1Ty);
+  UnpaddedCoerceElts.push_back(Field1Ty);
+
+  if (!Field2Ty) {
+    return ABIArgInfo::getCoerceAndExpand(
+        llvm::StructType::get(getVMContext(), CoerceElts, !Field1Off.isZero()),
+        UnpaddedCoerceElts[0]);
+  }
+
+  CharUnits Field2Align =
+      CharUnits::fromQuantity(getDataLayout().getABITypeAlign(Field2Ty));
+  CharUnits Field1End =
+      Field1Off +
+      CharUnits::fromQuantity(getDataLayout().getTypeStoreSize(Field1Ty));
+  CharUnits Field2OffNoPadNoPack = Field1End.alignTo(Field2Align);
+
+  CharUnits Padding = CharUnits::Zero();
+  if (Field2Off > Field2OffNoPadNoPack)
+    Padding = Field2Off - Field2OffNoPadNoPack;
+  else if (Field2Off != Field2Align && Field2Off > Field1End)
+    Padding = Field2Off - Field1End;
+
+  bool IsPacked = !Field2Off.isMultipleOf(Field2Align);
+
+  if (!Padding.isZero())
+    CoerceElts.push_back(llvm::ArrayType::get(
+        llvm::Type::getInt8Ty(getVMContext()), Padding.getQuantity()));
+
+  CoerceElts.push_back(Field2Ty);
+  UnpaddedCoerceElts.push_back(Field2Ty);
+
+  auto CoerceToType =
+      llvm::StructType::get(getVMContext(), CoerceElts, IsPacked);
+  auto UnpaddedCoerceToType =
+      llvm::StructType::get(getVMContext(), UnpaddedCoerceElts, IsPacked);
+
+  return ABIArgInfo::getCoerceAndExpand(CoerceToType, UnpaddedCoerceToType);
+}
+
+// Fixed-length RVV vectors are represented as scalable vectors in function
+// args/return and must be coerced from fixed vectors.
+ABIArgInfo RISCVABIInfo::coerceVLSVector(QualType Ty) const {
+  assert(Ty->isVectorType() && "expected vector type!");
+
+  const auto *VT = Ty->castAs<VectorType>();
+  assert(VT->getVectorKind() == VectorType::RVVFixedLengthDataVector &&
+         "Unexpected vector kind");
+
+  assert(VT->getElementType()->isBuiltinType() && "expected builtin type!");
+
+  const auto *BT = VT->getElementType()->castAs<BuiltinType>();
+  unsigned EltSize = getContext().getTypeSize(BT);
+  llvm::ScalableVectorType *ResType =
+      llvm::ScalableVectorType::get(CGT.ConvertType(VT->getElementType()),
+                                    llvm::RISCV::RVVBitsPerBlock / EltSize);
+  return ABIArgInfo::getDirect(ResType);
+}
+
+ABIArgInfo RISCVABIInfo::classifyArgumentType(QualType Ty, bool IsFixed,
+                                              int &ArgGPRsLeft,
+                                              int &ArgFPRsLeft) const {
+  assert(ArgGPRsLeft <= NumArgGPRs && "Arg GPR tracking underflow");
+  Ty = useFirstFieldIfTransparentUnion(Ty);
+
+  // Structures with either a non-trivial destructor or a non-trivial
+  // copy constructor are always passed indirectly.
+  if (CGCXXABI::RecordArgABI RAA = getRecordArgABI(Ty, getCXXABI())) {
+    if (ArgGPRsLeft)
+      ArgGPRsLeft -= 1;
+    return getNaturalAlignIndirect(Ty, /*ByVal=*/RAA ==
+                                           CGCXXABI::RAA_DirectInMemory);
+  }
+
+  // Ignore empty structs/unions.
+  if (isEmptyRecord(getContext(), Ty, true))
+    return ABIArgInfo::getIgnore();
+
+  uint64_t Size = getContext().getTypeSize(Ty);
+
+  // Pass floating point values via FPRs if possible.
+  if (IsFixed && Ty->isFloatingType() && !Ty->isComplexType() && FLen >= Size &&
+      ArgFPRsLeft) {
+    ArgFPRsLeft--;
+    return ABIArgInfo::getDirect();
+  }
+
+  // Complex types for the hard float ABI must be passed direct rather than
+  // using CoerceAndExpand.
+  if (IsFixed && Ty->isComplexType() && FLen && ArgFPRsLeft >= 2) {
+    QualType EltTy = Ty->castAs<ComplexType>()->getElementType();
+    if (getContext().getTypeSize(EltTy) <= FLen) {
+      ArgFPRsLeft -= 2;
+      return ABIArgInfo::getDirect();
+    }
+  }
+
+  if (IsFixed && FLen && Ty->isStructureOrClassType()) {
+    llvm::Type *Field1Ty = nullptr;
+    llvm::Type *Field2Ty = nullptr;
+    CharUnits Field1Off = CharUnits::Zero();
+    CharUnits Field2Off = CharUnits::Zero();
+    int NeededArgGPRs = 0;
+    int NeededArgFPRs = 0;
+    bool IsCandidate =
+        detectFPCCEligibleStruct(Ty, Field1Ty, Field1Off, Field2Ty, Field2Off,
+                                 NeededArgGPRs, NeededArgFPRs);
+    if (IsCandidate && NeededArgGPRs <= ArgGPRsLeft &&
+        NeededArgFPRs <= ArgFPRsLeft) {
+      ArgGPRsLeft -= NeededArgGPRs;
+      ArgFPRsLeft -= NeededArgFPRs;
+      return coerceAndExpandFPCCEligibleStruct(Field1Ty, Field1Off, Field2Ty,
+                                               Field2Off);
+    }
+  }
+
+  uint64_t NeededAlign = getContext().getTypeAlign(Ty);
+  // Determine the number of GPRs needed to pass the current argument
+  // according to the ABI. 2*XLen-aligned varargs are passed in "aligned"
+  // register pairs, so may consume 3 registers.
+  int NeededArgGPRs = 1;
+  if (!IsFixed && NeededAlign == 2 * XLen)
+    NeededArgGPRs = 2 + (ArgGPRsLeft % 2);
+  else if (Size > XLen && Size <= 2 * XLen)
+    NeededArgGPRs = 2;
+
+  if (NeededArgGPRs > ArgGPRsLeft) {
+    NeededArgGPRs = ArgGPRsLeft;
+  }
+
+  ArgGPRsLeft -= NeededArgGPRs;
+
+  if (!isAggregateTypeForABI(Ty) && !Ty->isVectorType()) {
+    // Treat an enum type as its underlying type.
+    if (const EnumType *EnumTy = Ty->getAs<EnumType>())
+      Ty = EnumTy->getDecl()->getIntegerType();
+
+    // All integral types are promoted to XLen width
+    if (Size < XLen && Ty->isIntegralOrEnumerationType()) {
+      return extendType(Ty);
+    }
+
+    if (const auto *EIT = Ty->getAs<BitIntType>()) {
+      if (EIT->getNumBits() < XLen)
+        return extendType(Ty);
+      if (EIT->getNumBits() > 128 ||
+          (!getContext().getTargetInfo().hasInt128Type() &&
+           EIT->getNumBits() > 64))
+        return getNaturalAlignIndirect(Ty, /*ByVal=*/false);
+    }
+
+    return ABIArgInfo::getDirect();
+  }
+
+  if (const VectorType *VT = Ty->getAs<VectorType>())
+    if (VT->getVectorKind() == VectorType::RVVFixedLengthDataVector)
+      return coerceVLSVector(Ty);
+
+  // Aggregates which are <= 2*XLen will be passed in registers if possible,
+  // so coerce to integers.
+  if (Size <= 2 * XLen) {
+    unsigned Alignment = getContext().getTypeAlign(Ty);
+
+    // Use a single XLen int if possible, 2*XLen if 2*XLen alignment is
+    // required, and a 2-element XLen array if only XLen alignment is required.
+    if (Size <= XLen) {
+      return ABIArgInfo::getDirect(
+          llvm::IntegerType::get(getVMContext(), XLen));
+    } else if (Alignment == 2 * XLen) {
+      return ABIArgInfo::getDirect(
+          llvm::IntegerType::get(getVMContext(), 2 * XLen));
+    } else {
+      return ABIArgInfo::getDirect(llvm::ArrayType::get(
+          llvm::IntegerType::get(getVMContext(), XLen), 2));
+    }
+  }
+  return getNaturalAlignIndirect(Ty, /*ByVal=*/false);
+}
+
+ABIArgInfo RISCVABIInfo::classifyReturnType(QualType RetTy) const {
+  if (RetTy->isVoidType())
+    return ABIArgInfo::getIgnore();
+
+  int ArgGPRsLeft = 2;
+  int ArgFPRsLeft = FLen ? 2 : 0;
+
+  // The rules for return and argument types are the same, so defer to
+  // classifyArgumentType.
+  return classifyArgumentType(RetTy, /*IsFixed=*/true, ArgGPRsLeft,
+                              ArgFPRsLeft);
+}
+
+Address RISCVABIInfo::EmitVAArg(CodeGenFunction &CGF, Address VAListAddr,
+                                QualType Ty) const {
+  CharUnits SlotSize = CharUnits::fromQuantity(XLen / 8);
+
+  // Empty records are ignored for parameter passing purposes.
+  if (isEmptyRecord(getContext(), Ty, true)) {
+    Address Addr = Address(CGF.Builder.CreateLoad(VAListAddr),
+                           getVAListElementType(CGF), SlotSize);
+    Addr = CGF.Builder.CreateElementBitCast(Addr, CGF.ConvertTypeForMem(Ty));
+    return Addr;
+  }
+
+  auto TInfo = getContext().getTypeInfoInChars(Ty);
+
+  // Arguments bigger than 2*Xlen bytes are passed indirectly.
+  bool IsIndirect = TInfo.Width > 2 * SlotSize;
+
+  return emitVoidPtrVAArg(CGF, VAListAddr, Ty, IsIndirect, TInfo, SlotSize,
+                          /*AllowHigherAlign=*/true);
+}
+
+ABIArgInfo RISCVABIInfo::extendType(QualType Ty) const {
+  int TySize = getContext().getTypeSize(Ty);
+  // RV64 ABI requires unsigned 32 bit integers to be sign extended.
+  if (XLen == 64 && Ty->isUnsignedIntegerOrEnumerationType() && TySize == 32)
+    return ABIArgInfo::getSignExtend(Ty);
+  return ABIArgInfo::getExtend(Ty);
+}
+
+RISCVTargetCodeGenInfo::RISCVTargetCodeGenInfo(CodeGenTypes &CGT,
+                                               unsigned int XLen,
+                                               unsigned int FLen)
+    : TargetCodeGenInfo(std::make_unique<RISCVABIInfo>(CGT, XLen, FLen)) {}
+
+void RISCVTargetCodeGenInfo::setTargetAttributes(const Decl *D,
+                                                 llvm::GlobalValue *GV,
+                                                 CodeGenModule &CGM) const {
+  const auto *FD = dyn_cast_or_null<FunctionDecl>(D);
+  if (!FD)
+    return;
+
+  const auto *Attr = FD->getAttr<RISCVInterruptAttr>();
+  if (!Attr)
+    return;
+
+  const char *Kind;
+  switch (Attr->getInterrupt()) {
+  case RISCVInterruptAttr::supervisor:
+    Kind = "supervisor";
+    break;
+  case RISCVInterruptAttr::machine:
+    Kind = "machine";
+    break;
+  }
+
+  auto *Fn = cast<llvm::Function>(GV);
+
+  Fn->addFnAttr("interrupt", Kind);
+}

clang/lib/CodeGen/Targets/SPIR.h

+//===- SPIR.h ---------------------------------------------------*- C++ -*-===//
+//
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
+//
+//===----------------------------------------------------------------------===//
+
+#ifndef LLVM_CLANG_LIB_CODEGEN_TARGETS_SPIR_H
+#define LLVM_CLANG_LIB_CODEGEN_TARGETS_SPIR_H
+
+#include "TargetInfo.h"
+
+namespace clang::CodeGen {
+
+class LLVM_LIBRARY_VISIBILITY CommonSPIRTargetCodeGenInfo
+    : public TargetCodeGenInfo {
+public:
+  CommonSPIRTargetCodeGenInfo(CodeGen::CodeGenTypes &CGT);
+  CommonSPIRTargetCodeGenInfo(std::unique_ptr<ABIInfo> ABIInfo);
+
+  LangAS getASTAllocaAddressSpace() const override;
+
+  unsigned getOpenCLKernelCallingConv() const override;
+  llvm::Type *getOpenCLType(CodeGenModule &CGM, const Type *T) const override;
+};
+
+class LLVM_LIBRARY_VISIBILITY SPIRVTargetCodeGenInfo
+    : public CommonSPIRTargetCodeGenInfo {
+public:
+  SPIRVTargetCodeGenInfo(CodeGen::CodeGenTypes &CGT);
+  void setCUDAKernelCallingConvention(const FunctionType *&FT) const override;
+};
+
+} // namespace clang::CodeGen
+
+#endif // LLVM_CLANG_LIB_CODEGEN_TARGETS_SPIR_H

clang/lib/CodeGen/Targets/SPIR.cpp

+//===- SPIR.cpp -----------------------------------------------------------===//
+//
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
+//
+//===----------------------------------------------------------------------===//
+
+#include "SPIR.h"
+#include "ABIInfoImpl.h"
+
+using namespace clang;
+using namespace clang::CodeGen;
+
+//===----------------------------------------------------------------------===//
+// Base ABI and target codegen info implementation common between SPIR and
+// SPIR-V.
+//===----------------------------------------------------------------------===//
+
+namespace {
+class CommonSPIRABIInfo : public DefaultABIInfo {
+public:
+  CommonSPIRABIInfo(CodeGenTypes &CGT) : DefaultABIInfo(CGT) { setCCs(); }
+
+private:
+  void setCCs();
+};
+
+class SPIRVABIInfo : public CommonSPIRABIInfo {
+public:
+  SPIRVABIInfo(CodeGenTypes &CGT) : CommonSPIRABIInfo(CGT) {}
+  void computeInfo(CGFunctionInfo &FI) const override;
+
+private:
+  ABIArgInfo classifyKernelArgumentType(QualType Ty) const;
+};
+} // end anonymous namespace
+
+void CommonSPIRABIInfo::setCCs() {
+  assert(getRuntimeCC() == llvm::CallingConv::C);
+  RuntimeCC = llvm::CallingConv::SPIR_FUNC;
+}
+
+ABIArgInfo SPIRVABIInfo::classifyKernelArgumentType(QualType Ty) const {
+  if (getContext().getLangOpts().CUDAIsDevice) {
+    // Coerce pointer arguments with default address space to CrossWorkGroup
+    // pointers for HIPSPV/CUDASPV. When the language mode is HIP/CUDA, the
+    // SPIRTargetInfo maps cuda_device to SPIR-V's CrossWorkGroup address space.
+    llvm::Type *LTy = CGT.ConvertType(Ty);
+    auto DefaultAS = getContext().getTargetAddressSpace(LangAS::Default);
+    auto GlobalAS = getContext().getTargetAddressSpace(LangAS::cuda_device);
+    auto *PtrTy = llvm::dyn_cast<llvm::PointerType>(LTy);
+    if (PtrTy && PtrTy->getAddressSpace() == DefaultAS) {
+      LTy = llvm::PointerType::getWithSamePointeeType(PtrTy, GlobalAS);
+      return ABIArgInfo::getDirect(LTy, 0, nullptr, false);
+    }
+
+    // Force copying aggregate type in kernel arguments by value when
+    // compiling CUDA targeting SPIR-V. This is required for the object
+    // copied to be valid on the device.
+    // This behavior follows the CUDA spec
+    // https://docs.nvidia.com/cuda/cuda-c-programming-guide/index.html#global-function-argument-processing,
+    // and matches the NVPTX implementation.
+    if (isAggregateTypeForABI(Ty))
+      return getNaturalAlignIndirect(Ty, /* byval */ true);
+  }
+  return classifyArgumentType(Ty);
+}
+
+void SPIRVABIInfo::computeInfo(CGFunctionInfo &FI) const {
+  // The logic is same as in DefaultABIInfo with an exception on the kernel
+  // arguments handling.
+  llvm::CallingConv::ID CC = FI.getCallingConvention();
+
+  if (!getCXXABI().classifyReturnType(FI))
+    FI.getReturnInfo() = classifyReturnType(FI.getReturnType());
+
+  for (auto &I : FI.arguments()) {
+    if (CC == llvm::CallingConv::SPIR_KERNEL) {
+      I.info = classifyKernelArgumentType(I.type);
+    } else {
+      I.info = classifyArgumentType(I.type);
+    }
+  }
+}
+
+namespace clang {
+namespace CodeGen {
+void computeSPIRKernelABIInfo(CodeGenModule &CGM, CGFunctionInfo &FI) {
+  if (CGM.getTarget().getTriple().isSPIRV())
+    SPIRVABIInfo(CGM.getTypes()).computeInfo(FI);
+  else
+    CommonSPIRABIInfo(CGM.getTypes()).computeInfo(FI);
+}
+} // namespace CodeGen
+} // namespace clang
+
+CommonSPIRTargetCodeGenInfo::CommonSPIRTargetCodeGenInfo(CodeGenTypes &CGT)
+    : TargetCodeGenInfo(std::make_unique<CommonSPIRABIInfo>(CGT)) {}
+
+CommonSPIRTargetCodeGenInfo::CommonSPIRTargetCodeGenInfo(
+    std::unique_ptr<ABIInfo> ABIInfo)
+    : TargetCodeGenInfo(std::move(ABIInfo)) {}
+
+LangAS CommonSPIRTargetCodeGenInfo::getASTAllocaAddressSpace() const {
+  return getLangASFromTargetAS(
+      getABIInfo().getDataLayout().getAllocaAddrSpace());
+}
+
+unsigned CommonSPIRTargetCodeGenInfo::getOpenCLKernelCallingConv() const {
+  return llvm::CallingConv::SPIR_KERNEL;
+}
+
+SPIRVTargetCodeGenInfo::SPIRVTargetCodeGenInfo(CodeGenTypes &CGT)
+    : CommonSPIRTargetCodeGenInfo(std::make_unique<SPIRVABIInfo>(CGT)) {}
+
+void SPIRVTargetCodeGenInfo::setCUDAKernelCallingConvention(
+    const FunctionType *&FT) const {
+  // Convert HIP kernels to SPIR-V kernels.
+  if (getABIInfo().getContext().getLangOpts().HIP) {
+    FT = getABIInfo().getContext().adjustFunctionType(
+        FT, FT->getExtInfo().withCallingConv(CC_OpenCLKernel));
+    return;
+  }
+}
+
+/// Construct a SPIR-V target extension type for the given OpenCL image type.
+static llvm::Type *getSPIRVImageType(llvm::LLVMContext &Ctx, StringRef BaseType,
+                                     StringRef OpenCLName,
+                                     unsigned AccessQualifier) {
+  // These parameters compare to the operands of OpTypeImage (see
+  // https://registry.khronos.org/SPIR-V/specs/unified1/SPIRV.html#OpTypeImage
+  // for more details). The first 6 integer parameters all default to 0, and
+  // will be changed to 1 only for the image type(s) that set the parameter to
+  // one. The 7th integer parameter is the access qualifier, which is tacked on
+  // at the end.
+  SmallVector<unsigned, 7> IntParams = {0, 0, 0, 0, 0, 0};
+
+  // Choose the dimension of the image--this corresponds to the Dim enum in
+  // SPIR-V (first integer parameter of OpTypeImage).
+  if (OpenCLName.startswith("image2d"))
+    IntParams[0] = 1; // 1D
+  else if (OpenCLName.startswith("image3d"))
+    IntParams[0] = 2; // 2D
+  else if (OpenCLName == "image1d_buffer")
+    IntParams[0] = 5; // Buffer
+  else
+    assert(OpenCLName.startswith("image1d") && "Unknown image type");
+
+  // Set the other integer parameters of OpTypeImage if necessary. Note that the
+  // OpenCL image types don't provide any information for the Sampled or
+  // Image Format parameters.
+  if (OpenCLName.contains("_depth"))
+    IntParams[1] = 1;
+  if (OpenCLName.contains("_array"))
+    IntParams[2] = 1;
+  if (OpenCLName.contains("_msaa"))
+    IntParams[3] = 1;
+
+  // Access qualifier
+  IntParams.push_back(AccessQualifier);
+
+  return llvm::TargetExtType::get(Ctx, BaseType, {llvm::Type::getVoidTy(Ctx)},
+                                  IntParams);
+}
+
+llvm::Type *CommonSPIRTargetCodeGenInfo::getOpenCLType(CodeGenModule &CGM,
+                                                       const Type *Ty) const {
+  llvm::LLVMContext &Ctx = CGM.getLLVMContext();
+  if (auto *PipeTy = dyn_cast<PipeType>(Ty))
+    return llvm::TargetExtType::get(Ctx, "spirv.Pipe", {},
+                                    {!PipeTy->isReadOnly()});
+  if (auto *BuiltinTy = dyn_cast<BuiltinType>(Ty)) {
+    enum AccessQualifier : unsigned { AQ_ro = 0, AQ_wo = 1, AQ_rw = 2 };
+    switch (BuiltinTy->getKind()) {
+#define IMAGE_TYPE(ImgType, Id, SingletonId, Access, Suffix)                   \
+  case BuiltinType::Id:                                                        \
+    return getSPIRVImageType(Ctx, "spirv.Image", #ImgType, AQ_##Suffix);
+#include "clang/Basic/OpenCLImageTypes.def"
+    case BuiltinType::OCLSampler:
+      return llvm::TargetExtType::get(Ctx, "spirv.Sampler");
+    case BuiltinType::OCLEvent:
+      return llvm::TargetExtType::get(Ctx, "spirv.Event");
+    case BuiltinType::OCLClkEvent:
+      return llvm::TargetExtType::get(Ctx, "spirv.DeviceEvent");
+    case BuiltinType::OCLQueue:
+      return llvm::TargetExtType::get(Ctx, "spirv.Queue");
+    case BuiltinType::OCLReserveID:
+      return llvm::TargetExtType::get(Ctx, "spirv.ReserveId");
+#define INTEL_SUBGROUP_AVC_TYPE(Name, Id)                                      \
+  case BuiltinType::OCLIntelSubgroupAVC##Id:                                   \
+    return llvm::TargetExtType::get(Ctx, "spirv.Avc" #Id "INTEL");
+#include "clang/Basic/OpenCLExtensionTypes.def"
+    default:
+      return nullptr;
+    }
+  }
+
+  return nullptr;
+}

clang/lib/CodeGen/Targets/Sparc.h

+//===- Sparc.h --------------------------------------------------*- C++ -*-===//
+//
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
+//
+//===----------------------------------------------------------------------===//
+
+#ifndef LLVM_CLANG_LIB_CODEGEN_TARGETS_SPARC_H
+#define LLVM_CLANG_LIB_CODEGEN_TARGETS_SPARC_H
+
+#include "TargetInfo.h"
+
+namespace clang::CodeGen {
+
+class LLVM_LIBRARY_VISIBILITY SparcV8TargetCodeGenInfo
+    : public TargetCodeGenInfo {
+public:
+  SparcV8TargetCodeGenInfo(CodeGenTypes &CGT);
+
+  llvm::Value *decodeReturnAddress(CodeGen::CodeGenFunction &CGF,
+                                   llvm::Value *Address) const override;
+
+  llvm::Value *encodeReturnAddress(CodeGen::CodeGenFunction &CGF,
+                                   llvm::Value *Address) const override;
+};
+
+class LLVM_LIBRARY_VISIBILITY SparcV9TargetCodeGenInfo
+    : public TargetCodeGenInfo {
+public:
+  SparcV9TargetCodeGenInfo(CodeGenTypes &CGT);
+
+  int getDwarfEHStackPointer(CodeGen::CodeGenModule &M) const override {
+    return 14;
+  }
+
+  bool initDwarfEHRegSizeTable(CodeGen::CodeGenFunction &CGF,
+                               llvm::Value *Address) const override;
+
+  llvm::Value *decodeReturnAddress(CodeGen::CodeGenFunction &CGF,
+                                   llvm::Value *Address) const override;
+
+  llvm::Value *encodeReturnAddress(CodeGen::CodeGenFunction &CGF,
+                                   llvm::Value *Address) const override;
+};
+
+} // namespace clang::CodeGen
+
+#endif // LLVM_CLANG_LIB_CODEGEN_TARGETS_SPARC_H

clang/lib/CodeGen/Targets/Sparc.cpp

+//===- Sparc.cpp ----------------------------------------------------------===//
+//
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
+//
+//===----------------------------------------------------------------------===//
+
+#include "Sparc.h"
+#include "ABIInfoImpl.h"
+
+using namespace clang;
+using namespace clang::CodeGen;
+
+//===----------------------------------------------------------------------===//
+// SPARC v8 ABI Implementation.
+// Based on the SPARC Compliance Definition version 2.4.1.
+//
+// Ensures that complex values are passed in registers.
+//
+namespace {
+class SparcV8ABIInfo : public DefaultABIInfo {
+public:
+  SparcV8ABIInfo(CodeGenTypes &CGT) : DefaultABIInfo(CGT) {}
+
+private:
+  ABIArgInfo classifyReturnType(QualType RetTy) const;
+  void computeInfo(CGFunctionInfo &FI) const override;
+};
+} // end anonymous namespace
+
+ABIArgInfo SparcV8ABIInfo::classifyReturnType(QualType Ty) const {
+  if (Ty->isAnyComplexType()) {
+    return ABIArgInfo::getDirect();
+  } else {
+    return DefaultABIInfo::classifyReturnType(Ty);
+  }
+}
+
+void SparcV8ABIInfo::computeInfo(CGFunctionInfo &FI) const {
+
+  FI.getReturnInfo() = classifyReturnType(FI.getReturnType());
+  for (auto &Arg : FI.arguments())
+    Arg.info = classifyArgumentType(Arg.type);
+}
+
+SparcV8TargetCodeGenInfo::SparcV8TargetCodeGenInfo(CodeGenTypes &CGT)
+    : TargetCodeGenInfo(std::make_unique<SparcV8ABIInfo>(CGT)) {}
+
+llvm::Value *
+SparcV8TargetCodeGenInfo::decodeReturnAddress(CodeGenFunction &CGF,
+                                              llvm::Value *Address) const {
+  int Offset;
+  if (isAggregateTypeForABI(CGF.CurFnInfo->getReturnType()))
+    Offset = 12;
+  else
+    Offset = 8;
+  return CGF.Builder.CreateGEP(CGF.Int8Ty, Address,
+                               llvm::ConstantInt::get(CGF.Int32Ty, Offset));
+}
+
+llvm::Value *
+SparcV8TargetCodeGenInfo::encodeReturnAddress(CodeGenFunction &CGF,
+                                              llvm::Value *Address) const {
+  int Offset;
+  if (isAggregateTypeForABI(CGF.CurFnInfo->getReturnType()))
+    Offset = -12;
+  else
+    Offset = -8;
+  return CGF.Builder.CreateGEP(CGF.Int8Ty, Address,
+                               llvm::ConstantInt::get(CGF.Int32Ty, Offset));
+}
+
+//===----------------------------------------------------------------------===//
+// SPARC v9 ABI Implementation.
+// Based on the SPARC Compliance Definition version 2.4.1.
+//
+// Function arguments a mapped to a nominal "parameter array" and promoted to
+// registers depending on their type. Each argument occupies 8 or 16 bytes in
+// the array, structs larger than 16 bytes are passed indirectly.
+//
+// One case requires special care:
+//
+//   struct mixed {
+//     int i;
+//     float f;
+//   };
+//
+// When a struct mixed is passed by value, it only occupies 8 bytes in the
+// parameter array, but the int is passed in an integer register, and the float
+// is passed in a floating point register. This is represented as two arguments
+// with the LLVM IR inreg attribute:
+//
+//   declare void f(i32 inreg %i, float inreg %f)
+//
+// The code generator will only allocate 4 bytes from the parameter array for
+// the inreg arguments. All other arguments are allocated a multiple of 8
+// bytes.
+//
+namespace {
+class SparcV9ABIInfo : public ABIInfo {
+public:
+  SparcV9ABIInfo(CodeGenTypes &CGT) : ABIInfo(CGT) {}
+
+private:
+  ABIArgInfo classifyType(QualType RetTy, unsigned SizeLimit) const;
+  void computeInfo(CGFunctionInfo &FI) const override;
+  Address EmitVAArg(CodeGenFunction &CGF, Address VAListAddr,
+                    QualType Ty) const override;
+
+  // Coercion type builder for structs passed in registers. The coercion type
+  // serves two purposes:
+  //
+  // 1. Pad structs to a multiple of 64 bits, so they are passed 'left-aligned'
+  //    in registers.
+  // 2. Expose aligned floating point elements as first-level elements, so the
+  //    code generator knows to pass them in floating point registers.
+  //
+  // We also compute the InReg flag which indicates that the struct contains
+  // aligned 32-bit floats.
+  //
+  struct CoerceBuilder {
+    llvm::LLVMContext &Context;
+    const llvm::DataLayout &DL;
+    SmallVector<llvm::Type *, 8> Elems;
+    uint64_t Size;
+    bool InReg;
+
+    CoerceBuilder(llvm::LLVMContext &c, const llvm::DataLayout &dl)
+        : Context(c), DL(dl), Size(0), InReg(false) {}
+
+    // Pad Elems with integers until Size is ToSize.
+    void pad(uint64_t ToSize) {
+      assert(ToSize >= Size && "Cannot remove elements");
+      if (ToSize == Size)
+        return;
+
+      // Finish the current 64-bit word.
+      uint64_t Aligned = llvm::alignTo(Size, 64);
+      if (Aligned > Size && Aligned <= ToSize) {
+        Elems.push_back(llvm::IntegerType::get(Context, Aligned - Size));
+        Size = Aligned;
+      }
+
+      // Add whole 64-bit words.
+      while (Size + 64 <= ToSize) {
+        Elems.push_back(llvm::Type::getInt64Ty(Context));
+        Size += 64;
+      }
+
+      // Final in-word padding.
+      if (Size < ToSize) {
+        Elems.push_back(llvm::IntegerType::get(Context, ToSize - Size));
+        Size = ToSize;
+      }
+    }
+
+    // Add a floating point element at Offset.
+    void addFloat(uint64_t Offset, llvm::Type *Ty, unsigned Bits) {
+      // Unaligned floats are treated as integers.
+      if (Offset % Bits)
+        return;
+      // The InReg flag is only required if there are any floats < 64 bits.
+      if (Bits < 64)
+        InReg = true;
+      pad(Offset);
+      Elems.push_back(Ty);
+      Size = Offset + Bits;
+    }
+
+    // Add a struct type to the coercion type, starting at Offset (in bits).
+    void addStruct(uint64_t Offset, llvm::StructType *StrTy) {
+      const llvm::StructLayout *Layout = DL.getStructLayout(StrTy);
+      for (unsigned i = 0, e = StrTy->getNumElements(); i != e; ++i) {
+        llvm::Type *ElemTy = StrTy->getElementType(i);
+        uint64_t ElemOffset = Offset + Layout->getElementOffsetInBits(i);
+        switch (ElemTy->getTypeID()) {
+        case llvm::Type::StructTyID:
+          addStruct(ElemOffset, cast<llvm::StructType>(ElemTy));
+          break;
+        case llvm::Type::FloatTyID:
+          addFloat(ElemOffset, ElemTy, 32);
+          break;
+        case llvm::Type::DoubleTyID:
+          addFloat(ElemOffset, ElemTy, 64);
+          break;
+        case llvm::Type::FP128TyID:
+          addFloat(ElemOffset, ElemTy, 128);
+          break;
+        case llvm::Type::PointerTyID:
+          if (ElemOffset % 64 == 0) {
+            pad(ElemOffset);
+            Elems.push_back(ElemTy);
+            Size += 64;
+          }
+          break;
+        default:
+          break;
+        }
+      }
+    }
+
+    // Check if Ty is a usable substitute for the coercion type.
+    bool isUsableType(llvm::StructType *Ty) const {
+      return llvm::ArrayRef(Elems) == Ty->elements();
+    }
+
+    // Get the coercion type as a literal struct type.
+    llvm::Type *getType() const {
+      if (Elems.size() == 1)
+        return Elems.front();
+      else
+        return llvm::StructType::get(Context, Elems);
+    }
+  };
+};
+} // end anonymous namespace
+
+ABIArgInfo SparcV9ABIInfo::classifyType(QualType Ty, unsigned SizeLimit) const {
+  if (Ty->isVoidType())
+    return ABIArgInfo::getIgnore();
+
+  uint64_t Size = getContext().getTypeSize(Ty);
+
+  // Anything too big to fit in registers is passed with an explicit indirect
+  // pointer / sret pointer.
+  if (Size > SizeLimit)
+    return getNaturalAlignIndirect(Ty, /*ByVal=*/false);
+
+  // Treat an enum type as its underlying type.
+  if (const EnumType *EnumTy = Ty->getAs<EnumType>())
+    Ty = EnumTy->getDecl()->getIntegerType();
+
+  // Integer types smaller than a register are extended.
+  if (Size < 64 && Ty->isIntegerType())
+    return ABIArgInfo::getExtend(Ty);
+
+  if (const auto *EIT = Ty->getAs<BitIntType>())
+    if (EIT->getNumBits() < 64)
+      return ABIArgInfo::getExtend(Ty);
+
+  // Other non-aggregates go in registers.
+  if (!isAggregateTypeForABI(Ty))
+    return ABIArgInfo::getDirect();
+
+  // If a C++ object has either a non-trivial copy constructor or a non-trivial
+  // destructor, it is passed with an explicit indirect pointer / sret pointer.
+  if (CGCXXABI::RecordArgABI RAA = getRecordArgABI(Ty, getCXXABI()))
+    return getNaturalAlignIndirect(Ty, RAA == CGCXXABI::RAA_DirectInMemory);
+
+  // This is a small aggregate type that should be passed in registers.
+  // Build a coercion type from the LLVM struct type.
+  llvm::StructType *StrTy = dyn_cast<llvm::StructType>(CGT.ConvertType(Ty));
+  if (!StrTy)
+    return ABIArgInfo::getDirect();
+
+  CoerceBuilder CB(getVMContext(), getDataLayout());
+  CB.addStruct(0, StrTy);
+  CB.pad(llvm::alignTo(CB.DL.getTypeSizeInBits(StrTy), 64));
+
+  // Try to use the original type for coercion.
+  llvm::Type *CoerceTy = CB.isUsableType(StrTy) ? StrTy : CB.getType();
+
+  if (CB.InReg)
+    return ABIArgInfo::getDirectInReg(CoerceTy);
+  else
+    return ABIArgInfo::getDirect(CoerceTy);
+}
+
+Address SparcV9ABIInfo::EmitVAArg(CodeGenFunction &CGF, Address VAListAddr,
+                                  QualType Ty) const {
+  ABIArgInfo AI = classifyType(Ty, 16 * 8);
+  llvm::Type *ArgTy = CGT.ConvertType(Ty);
+  if (AI.canHaveCoerceToType() && !AI.getCoerceToType())
+    AI.setCoerceToType(ArgTy);
+
+  CharUnits SlotSize = CharUnits::fromQuantity(8);
+
+  CGBuilderTy &Builder = CGF.Builder;
+  Address Addr = Address(Builder.CreateLoad(VAListAddr, "ap.cur"),
+                         getVAListElementType(CGF), SlotSize);
+  llvm::Type *ArgPtrTy = llvm::PointerType::getUnqual(ArgTy);
+
+  auto TypeInfo = getContext().getTypeInfoInChars(Ty);
+
+  Address ArgAddr = Address::invalid();
+  CharUnits Stride;
+  switch (AI.getKind()) {
+  case ABIArgInfo::Expand:
+  case ABIArgInfo::CoerceAndExpand:
+  case ABIArgInfo::InAlloca:
+    llvm_unreachable("Unsupported ABI kind for va_arg");
+
+  case ABIArgInfo::Extend: {
+    Stride = SlotSize;
+    CharUnits Offset = SlotSize - TypeInfo.Width;
+    ArgAddr = Builder.CreateConstInBoundsByteGEP(Addr, Offset, "extend");
+    break;
+  }
+
+  case ABIArgInfo::Direct: {
+    auto AllocSize = getDataLayout().getTypeAllocSize(AI.getCoerceToType());
+    Stride = CharUnits::fromQuantity(AllocSize).alignTo(SlotSize);
+    ArgAddr = Addr;
+    break;
+  }
+
+  case ABIArgInfo::Indirect:
+  case ABIArgInfo::IndirectAliased:
+    Stride = SlotSize;
+    ArgAddr = Builder.CreateElementBitCast(Addr, ArgPtrTy, "indirect");
+    ArgAddr = Address(Builder.CreateLoad(ArgAddr, "indirect.arg"), ArgTy,
+                      TypeInfo.Align);
+    break;
+
+  case ABIArgInfo::Ignore:
+    return Address(llvm::UndefValue::get(ArgPtrTy), ArgTy, TypeInfo.Align);
+  }
+
+  // Update VAList.
+  Address NextPtr = Builder.CreateConstInBoundsByteGEP(Addr, Stride, "ap.next");
+  Builder.CreateStore(NextPtr.getPointer(), VAListAddr);
+
+  return Builder.CreateElementBitCast(ArgAddr, ArgTy, "arg.addr");
+}
+
+void SparcV9ABIInfo::computeInfo(CGFunctionInfo &FI) const {
+  FI.getReturnInfo() = classifyType(FI.getReturnType(), 32 * 8);
+  for (auto &I : FI.arguments())
+    I.info = classifyType(I.type, 16 * 8);
+}
+
+SparcV9TargetCodeGenInfo::SparcV9TargetCodeGenInfo(CodeGenTypes &CGT)
+    : TargetCodeGenInfo(std::make_unique<SparcV9ABIInfo>(CGT)) {}
+
+llvm::Value *
+SparcV9TargetCodeGenInfo::decodeReturnAddress(CodeGenFunction &CGF,
+                                              llvm::Value *Address) const {
+  return CGF.Builder.CreateGEP(CGF.Int8Ty, Address,
+                               llvm::ConstantInt::get(CGF.Int32Ty, 8));
+}
+
+llvm::Value *
+SparcV9TargetCodeGenInfo::encodeReturnAddress(CodeGenFunction &CGF,
+                                              llvm::Value *Address) const {
+  return CGF.Builder.CreateGEP(CGF.Int8Ty, Address,
+                               llvm::ConstantInt::get(CGF.Int32Ty, -8));
+}
+
+bool SparcV9TargetCodeGenInfo::initDwarfEHRegSizeTable(
+    CodeGen::CodeGenFunction &CGF, llvm::Value *Address) const {
+  // This is calculated from the LLVM and GCC tables and verified
+  // against gcc output.  AFAIK all ABIs use the same encoding.
+
+  CodeGen::CGBuilderTy &Builder = CGF.Builder;
+
+  llvm::IntegerType *i8 = CGF.Int8Ty;
+  llvm::Value *Four8 = llvm::ConstantInt::get(i8, 4);
+  llvm::Value *Eight8 = llvm::ConstantInt::get(i8, 8);
+
+  // 0-31: the 8-byte general-purpose registers
+  AssignToArrayRange(Builder, Address, Eight8, 0, 31);
+
+  // 32-63: f0-31, the 4-byte floating-point registers
+  AssignToArrayRange(Builder, Address, Four8, 32, 63);
+
+  //   Y   = 64
+  //   PSR = 65
+  //   WIM = 66
+  //   TBR = 67
+  //   PC  = 68
+  //   NPC = 69
+  //   FSR = 70
+  //   CSR = 71
+  AssignToArrayRange(Builder, Address, Eight8, 64, 71);
+
+  // 72-87: d0-15, the 8-byte floating-point registers
+  AssignToArrayRange(Builder, Address, Eight8, 72, 87);
+
+  return false;
+}

clang/lib/CodeGen/Targets/SystemZ.h

+//===- SystemZ.h ------------------------------------------------*- C++ -*-===//
+//
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
+//
+//===----------------------------------------------------------------------===//
+
+#ifndef LLVM_CLANG_LIB_CODEGEN_TARGETS_SYSTEMZ_H
+#define LLVM_CLANG_LIB_CODEGEN_TARGETS_SYSTEMZ_H
+
+#include "TargetInfo.h"
+
+namespace clang::CodeGen {
+
+class LLVM_LIBRARY_VISIBILITY SystemZTargetCodeGenInfo
+    : public TargetCodeGenInfo {
+  ASTContext &Ctx;
+
+  // These are used for speeding up the search for a visible vector ABI.
+  mutable bool HasVisibleVecABIFlag = false;
+  mutable std::set<const Type *> SeenTypes;
+
+  // Returns true (the first time) if Ty is, or is found to include, a vector
+  // type that exposes the vector ABI. This is any vector >=16 bytes which
+  // with vector support are aligned to only 8 bytes. When IsParam is true,
+  // the type belongs to a value as passed between functions. If it is a
+  // vector <=16 bytes it will be passed in a vector register (if supported).
+  bool isVectorTypeBased(const Type *Ty, bool IsParam) const;
+
+public:
+  SystemZTargetCodeGenInfo(CodeGenTypes &CGT, bool HasVector,
+                           bool SoftFloatABI);
+
+  // The vector ABI is different when the vector facility is present and when
+  // a module e.g. defines an externally visible vector variable, a flag
+  // indicating a visible vector ABI is added. Eventually this will result in
+  // a GNU attribute indicating the vector ABI of the module.  Ty is the type
+  // of a variable or function parameter that is globally visible.
+  void handleExternallyVisibleObjABI(const Type *Ty, CodeGen::CodeGenModule &M,
+                                     bool IsParam) const {
+    if (!HasVisibleVecABIFlag && isVectorTypeBased(Ty, IsParam)) {
+      M.getModule().addModuleFlag(llvm::Module::Warning,
+                                  "s390x-visible-vector-ABI", 1);
+      HasVisibleVecABIFlag = true;
+    }
+  }
+
+  void setTargetAttributes(const Decl *D, llvm::GlobalValue *GV,
+                           CodeGen::CodeGenModule &M) const override;
+
+  llvm::Value *testFPKind(llvm::Value *V, unsigned BuiltinID,
+                          CGBuilderTy &Builder,
+                          CodeGenModule &CGM) const override;
+};
+
+} // namespace clang::CodeGen
+
+#endif // LLVM_CLANG_LIB_CODEGEN_TARGETS_SYSTEMZ_H

clang/lib/CodeGen/Targets/SystemZ.cpp

+//===- SystemZ.cpp --------------------------------------------------------===//
+//
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
+//
+//===----------------------------------------------------------------------===//
+
+#include "SystemZ.h"
+#include "ABIInfoImpl.h"
+#include "clang/Basic/Builtins.h"
+#include "llvm/IR/IntrinsicsS390.h"
+
+using namespace clang;
+using namespace clang::CodeGen;
+
+//===----------------------------------------------------------------------===//
+// SystemZ ABI Implementation
+//===----------------------------------------------------------------------===//
+
+namespace {
+
+class SystemZABIInfo : public ABIInfo {
+  bool HasVector;
+  bool IsSoftFloatABI;
+
+public:
+  SystemZABIInfo(CodeGenTypes &CGT, bool HV, bool SF)
+      : ABIInfo(CGT), HasVector(HV), IsSoftFloatABI(SF) {}
+
+  bool isPromotableIntegerTypeForABI(QualType Ty) const;
+  bool isCompoundType(QualType Ty) const;
+  bool isVectorArgumentType(QualType Ty) const;
+  bool isFPArgumentType(QualType Ty) const;
+  QualType GetSingleElementType(QualType Ty) const;
+
+  ABIArgInfo classifyReturnType(QualType RetTy) const;
+  ABIArgInfo classifyArgumentType(QualType ArgTy) const;
+
+  void computeInfo(CGFunctionInfo &FI) const override;
+  Address EmitVAArg(CodeGenFunction &CGF, Address VAListAddr,
+                    QualType Ty) const override;
+};
+
+} // namespace
+
+bool SystemZABIInfo::isPromotableIntegerTypeForABI(QualType Ty) const {
+  // Treat an enum type as its underlying type.
+  if (const EnumType *EnumTy = Ty->getAs<EnumType>())
+    Ty = EnumTy->getDecl()->getIntegerType();
+
+  // Promotable integer types are required to be promoted by the ABI.
+  if (ABIInfo::isPromotableIntegerTypeForABI(Ty))
+    return true;
+
+  if (const auto *EIT = Ty->getAs<BitIntType>())
+    if (EIT->getNumBits() < 64)
+      return true;
+
+  // 32-bit values must also be promoted.
+  if (const BuiltinType *BT = Ty->getAs<BuiltinType>())
+    switch (BT->getKind()) {
+    case BuiltinType::Int:
+    case BuiltinType::UInt:
+      return true;
+    default:
+      return false;
+    }
+  return false;
+}
+
+bool SystemZABIInfo::isCompoundType(QualType Ty) const {
+  return (Ty->isAnyComplexType() || Ty->isVectorType() ||
+          isAggregateTypeForABI(Ty));
+}
+
+bool SystemZABIInfo::isVectorArgumentType(QualType Ty) const {
+  return (HasVector && Ty->isVectorType() &&
+          getContext().getTypeSize(Ty) <= 128);
+}
+
+bool SystemZABIInfo::isFPArgumentType(QualType Ty) const {
+  if (IsSoftFloatABI)
+    return false;
+
+  if (const BuiltinType *BT = Ty->getAs<BuiltinType>())
+    switch (BT->getKind()) {
+    case BuiltinType::Float:
+    case BuiltinType::Double:
+      return true;
+    default:
+      return false;
+    }
+
+  return false;
+}
+
+QualType SystemZABIInfo::GetSingleElementType(QualType Ty) const {
+  const RecordType *RT = Ty->getAs<RecordType>();
+
+  if (RT && RT->isStructureOrClassType()) {
+    const RecordDecl *RD = RT->getDecl();
+    QualType Found;
+
+    // If this is a C++ record, check the bases first.
+    if (const CXXRecordDecl *CXXRD = dyn_cast<CXXRecordDecl>(RD))
+      if (CXXRD->hasDefinition())
+        for (const auto &I : CXXRD->bases()) {
+          QualType Base = I.getType();
+
+          // Empty bases don't affect things either way.
+          if (isEmptyRecord(getContext(), Base, true))
+            continue;
+
+          if (!Found.isNull())
+            return Ty;
+          Found = GetSingleElementType(Base);
+        }
+
+    // Check the fields.
+    for (const auto *FD : RD->fields()) {
+      // Unlike isSingleElementStruct(), empty structure and array fields
+      // do count.  So do anonymous bitfields that aren't zero-sized.
+
+      // Like isSingleElementStruct(), ignore C++20 empty data members.
+      if (FD->hasAttr<NoUniqueAddressAttr>() &&
+          isEmptyRecord(getContext(), FD->getType(), true))
+        continue;
+
+      // Unlike isSingleElementStruct(), arrays do not count.
+      // Nested structures still do though.
+      if (!Found.isNull())
+        return Ty;
+      Found = GetSingleElementType(FD->getType());
+    }
+
+    // Unlike isSingleElementStruct(), trailing padding is allowed.
+    // An 8-byte aligned struct s { float f; } is passed as a double.
+    if (!Found.isNull())
+      return Found;
+  }
+
+  return Ty;
+}
+
+Address SystemZABIInfo::EmitVAArg(CodeGenFunction &CGF, Address VAListAddr,
+                                  QualType Ty) const {
+  // Assume that va_list type is correct; should be pointer to LLVM type:
+  // struct {
+  //   i64 __gpr;
+  //   i64 __fpr;
+  //   i8 *__overflow_arg_area;
+  //   i8 *__reg_save_area;
+  // };
+
+  // Every non-vector argument occupies 8 bytes and is passed by preference
+  // in either GPRs or FPRs.  Vector arguments occupy 8 or 16 bytes and are
+  // always passed on the stack.
+  const SystemZTargetCodeGenInfo &SZCGI =
+      static_cast<const SystemZTargetCodeGenInfo &>(
+          CGT.getCGM().getTargetCodeGenInfo());
+  Ty = getContext().getCanonicalType(Ty);
+  auto TyInfo = getContext().getTypeInfoInChars(Ty);
+  llvm::Type *ArgTy = CGF.ConvertTypeForMem(Ty);
+  llvm::Type *DirectTy = ArgTy;
+  ABIArgInfo AI = classifyArgumentType(Ty);
+  bool IsIndirect = AI.isIndirect();
+  bool InFPRs = false;
+  bool IsVector = false;
+  CharUnits UnpaddedSize;
+  CharUnits DirectAlign;
+  SZCGI.handleExternallyVisibleObjABI(Ty.getTypePtr(), CGT.getCGM(),
+                                      /*IsParam*/ true);
+  if (IsIndirect) {
+    DirectTy = llvm::PointerType::getUnqual(DirectTy);
+    UnpaddedSize = DirectAlign = CharUnits::fromQuantity(8);
+  } else {
+    if (AI.getCoerceToType())
+      ArgTy = AI.getCoerceToType();
+    InFPRs = (!IsSoftFloatABI && (ArgTy->isFloatTy() || ArgTy->isDoubleTy()));
+    IsVector = ArgTy->isVectorTy();
+    UnpaddedSize = TyInfo.Width;
+    DirectAlign = TyInfo.Align;
+  }
+  CharUnits PaddedSize = CharUnits::fromQuantity(8);
+  if (IsVector && UnpaddedSize > PaddedSize)
+    PaddedSize = CharUnits::fromQuantity(16);
+  assert((UnpaddedSize <= PaddedSize) && "Invalid argument size.");
+
+  CharUnits Padding = (PaddedSize - UnpaddedSize);
+
+  llvm::Type *IndexTy = CGF.Int64Ty;
+  llvm::Value *PaddedSizeV =
+      llvm::ConstantInt::get(IndexTy, PaddedSize.getQuantity());
+
+  if (IsVector) {
+    // Work out the address of a vector argument on the stack.
+    // Vector arguments are always passed in the high bits of a
+    // single (8 byte) or double (16 byte) stack slot.
+    Address OverflowArgAreaPtr =
+        CGF.Builder.CreateStructGEP(VAListAddr, 2, "overflow_arg_area_ptr");
+    Address OverflowArgArea =
+        Address(CGF.Builder.CreateLoad(OverflowArgAreaPtr, "overflow_arg_area"),
+                CGF.Int8Ty, TyInfo.Align);
+    Address MemAddr =
+        CGF.Builder.CreateElementBitCast(OverflowArgArea, DirectTy, "mem_addr");
+
+    // Update overflow_arg_area_ptr pointer
+    llvm::Value *NewOverflowArgArea = CGF.Builder.CreateGEP(
+        OverflowArgArea.getElementType(), OverflowArgArea.getPointer(),
+        PaddedSizeV, "overflow_arg_area");
+    CGF.Builder.CreateStore(NewOverflowArgArea, OverflowArgAreaPtr);
+
+    return MemAddr;
+  }
+
+  assert(PaddedSize.getQuantity() == 8);
+
+  unsigned MaxRegs, RegCountField, RegSaveIndex;
+  CharUnits RegPadding;
+  if (InFPRs) {
+    MaxRegs = 4;              // Maximum of 4 FPR arguments
+    RegCountField = 1;        // __fpr
+    RegSaveIndex = 16;        // save offset for f0
+    RegPadding = CharUnits(); // floats are passed in the high bits of an FPR
+  } else {
+    MaxRegs = 5;          // Maximum of 5 GPR arguments
+    RegCountField = 0;    // __gpr
+    RegSaveIndex = 2;     // save offset for r2
+    RegPadding = Padding; // values are passed in the low bits of a GPR
+  }
+
+  Address RegCountPtr =
+      CGF.Builder.CreateStructGEP(VAListAddr, RegCountField, "reg_count_ptr");
+  llvm::Value *RegCount = CGF.Builder.CreateLoad(RegCountPtr, "reg_count");
+  llvm::Value *MaxRegsV = llvm::ConstantInt::get(IndexTy, MaxRegs);
+  llvm::Value *InRegs =
+      CGF.Builder.CreateICmpULT(RegCount, MaxRegsV, "fits_in_regs");
+
+  llvm::BasicBlock *InRegBlock = CGF.createBasicBlock("vaarg.in_reg");
+  llvm::BasicBlock *InMemBlock = CGF.createBasicBlock("vaarg.in_mem");
+  llvm::BasicBlock *ContBlock = CGF.createBasicBlock("vaarg.end");
+  CGF.Builder.CreateCondBr(InRegs, InRegBlock, InMemBlock);
+
+  // Emit code to load the value if it was passed in registers.
+  CGF.EmitBlock(InRegBlock);
+
+  // Work out the address of an argument register.
+  llvm::Value *ScaledRegCount =
+      CGF.Builder.CreateMul(RegCount, PaddedSizeV, "scaled_reg_count");
+  llvm::Value *RegBase =
+      llvm::ConstantInt::get(IndexTy, RegSaveIndex * PaddedSize.getQuantity() +
+                                          RegPadding.getQuantity());
+  llvm::Value *RegOffset =
+      CGF.Builder.CreateAdd(ScaledRegCount, RegBase, "reg_offset");
+  Address RegSaveAreaPtr =
+      CGF.Builder.CreateStructGEP(VAListAddr, 3, "reg_save_area_ptr");
+  llvm::Value *RegSaveArea =
+      CGF.Builder.CreateLoad(RegSaveAreaPtr, "reg_save_area");
+  Address RawRegAddr(
+      CGF.Builder.CreateGEP(CGF.Int8Ty, RegSaveArea, RegOffset, "raw_reg_addr"),
+      CGF.Int8Ty, PaddedSize);
+  Address RegAddr =
+      CGF.Builder.CreateElementBitCast(RawRegAddr, DirectTy, "reg_addr");
+
+  // Update the register count
+  llvm::Value *One = llvm::ConstantInt::get(IndexTy, 1);
+  llvm::Value *NewRegCount = CGF.Builder.CreateAdd(RegCount, One, "reg_count");
+  CGF.Builder.CreateStore(NewRegCount, RegCountPtr);
+  CGF.EmitBranch(ContBlock);
+
+  // Emit code to load the value if it was passed in memory.
+  CGF.EmitBlock(InMemBlock);
+
+  // Work out the address of a stack argument.
+  Address OverflowArgAreaPtr =
+      CGF.Builder.CreateStructGEP(VAListAddr, 2, "overflow_arg_area_ptr");
+  Address OverflowArgArea =
+      Address(CGF.Builder.CreateLoad(OverflowArgAreaPtr, "overflow_arg_area"),
+              CGF.Int8Ty, PaddedSize);
+  Address RawMemAddr =
+      CGF.Builder.CreateConstByteGEP(OverflowArgArea, Padding, "raw_mem_addr");
+  Address MemAddr =
+      CGF.Builder.CreateElementBitCast(RawMemAddr, DirectTy, "mem_addr");
+
+  // Update overflow_arg_area_ptr pointer
+  llvm::Value *NewOverflowArgArea = CGF.Builder.CreateGEP(
+      OverflowArgArea.getElementType(), OverflowArgArea.getPointer(),
+      PaddedSizeV, "overflow_arg_area");
+  CGF.Builder.CreateStore(NewOverflowArgArea, OverflowArgAreaPtr);
+  CGF.EmitBranch(ContBlock);
+
+  // Return the appropriate result.
+  CGF.EmitBlock(ContBlock);
+  Address ResAddr = emitMergePHI(CGF, RegAddr, InRegBlock, MemAddr, InMemBlock,
+                                 "va_arg.addr");
+
+  if (IsIndirect)
+    ResAddr = Address(CGF.Builder.CreateLoad(ResAddr, "indirect_arg"), ArgTy,
+                      TyInfo.Align);
+
+  return ResAddr;
+}
+
+ABIArgInfo SystemZABIInfo::classifyReturnType(QualType RetTy) const {
+  if (RetTy->isVoidType())
+    return ABIArgInfo::getIgnore();
+  if (isVectorArgumentType(RetTy))
+    return ABIArgInfo::getDirect();
+  if (isCompoundType(RetTy) || getContext().getTypeSize(RetTy) > 64)
+    return getNaturalAlignIndirect(RetTy);
+  return (isPromotableIntegerTypeForABI(RetTy) ? ABIArgInfo::getExtend(RetTy)
+                                               : ABIArgInfo::getDirect());
+}
+
+ABIArgInfo SystemZABIInfo::classifyArgumentType(QualType Ty) const {
+  // Handle the generic C++ ABI.
+  if (CGCXXABI::RecordArgABI RAA = getRecordArgABI(Ty, getCXXABI()))
+    return getNaturalAlignIndirect(Ty, RAA == CGCXXABI::RAA_DirectInMemory);
+
+  // Integers and enums are extended to full register width.
+  if (isPromotableIntegerTypeForABI(Ty))
+    return ABIArgInfo::getExtend(Ty);
+
+  // Handle vector types and vector-like structure types.  Note that
+  // as opposed to float-like structure types, we do not allow any
+  // padding for vector-like structures, so verify the sizes match.
+  uint64_t Size = getContext().getTypeSize(Ty);
+  QualType SingleElementTy = GetSingleElementType(Ty);
+  if (isVectorArgumentType(SingleElementTy) &&
+      getContext().getTypeSize(SingleElementTy) == Size)
+    return ABIArgInfo::getDirect(CGT.ConvertType(SingleElementTy));
+
+  // Values that are not 1, 2, 4 or 8 bytes in size are passed indirectly.
+  if (Size != 8 && Size != 16 && Size != 32 && Size != 64)
+    return getNaturalAlignIndirect(Ty, /*ByVal=*/false);
+
+  // Handle small structures.
+  if (const RecordType *RT = Ty->getAs<RecordType>()) {
+    // Structures with flexible arrays have variable length, so really
+    // fail the size test above.
+    const RecordDecl *RD = RT->getDecl();
+    if (RD->hasFlexibleArrayMember())
+      return getNaturalAlignIndirect(Ty, /*ByVal=*/false);
+
+    // The structure is passed as an unextended integer, a float, or a double.
+    llvm::Type *PassTy;
+    if (isFPArgumentType(SingleElementTy)) {
+      assert(Size == 32 || Size == 64);
+      if (Size == 32)
+        PassTy = llvm::Type::getFloatTy(getVMContext());
+      else
+        PassTy = llvm::Type::getDoubleTy(getVMContext());
+    } else
+      PassTy = llvm::IntegerType::get(getVMContext(), Size);
+    return ABIArgInfo::getDirect(PassTy);
+  }
+
+  // Non-structure compounds are passed indirectly.
+  if (isCompoundType(Ty))
+    return getNaturalAlignIndirect(Ty, /*ByVal=*/false);
+
+  return ABIArgInfo::getDirect(nullptr);
+}
+
+void SystemZABIInfo::computeInfo(CGFunctionInfo &FI) const {
+  const SystemZTargetCodeGenInfo &SZCGI =
+      static_cast<const SystemZTargetCodeGenInfo &>(
+          CGT.getCGM().getTargetCodeGenInfo());
+  if (!getCXXABI().classifyReturnType(FI))
+    FI.getReturnInfo() = classifyReturnType(FI.getReturnType());
+  unsigned Idx = 0;
+  for (auto &I : FI.arguments()) {
+    I.info = classifyArgumentType(I.type);
+    if (FI.isVariadic() && Idx++ >= FI.getNumRequiredArgs())
+      // Check if a vararg vector argument is passed, in which case the
+      // vector ABI becomes visible as the va_list could be passed on to
+      // other functions.
+      SZCGI.handleExternallyVisibleObjABI(I.type.getTypePtr(), CGT.getCGM(),
+                                          /*IsParam*/ true);
+  }
+}
+
+SystemZTargetCodeGenInfo::SystemZTargetCodeGenInfo(CodeGenTypes &CGT,
+                                                   bool HasVector,
+                                                   bool SoftFloatABI)
+    : TargetCodeGenInfo(
+          std::make_unique<SystemZABIInfo>(CGT, HasVector, SoftFloatABI)),
+      Ctx(CGT.getContext()) {
+  SwiftInfo =
+      std::make_unique<SwiftABIInfo>(CGT, /*SwiftErrorInRegister=*/false);
+}
+
+void SystemZTargetCodeGenInfo::setTargetAttributes(const Decl *D,
+                                                   llvm::GlobalValue *GV,
+                                                   CodeGenModule &M) const {
+  if (!D)
+    return;
+
+  // Check if the vector ABI becomes visible by an externally visible
+  // variable or function.
+  if (const auto *VD = dyn_cast<VarDecl>(D)) {
+    if (VD->isExternallyVisible())
+      handleExternallyVisibleObjABI(VD->getType().getTypePtr(), M,
+                                    /*IsParam*/ false);
+  } else if (const FunctionDecl *FD = dyn_cast<FunctionDecl>(D)) {
+    if (FD->isExternallyVisible())
+      handleExternallyVisibleObjABI(FD->getType().getTypePtr(), M,
+                                    /*IsParam*/ false);
+  }
+}
+
+llvm::Value *SystemZTargetCodeGenInfo::testFPKind(llvm::Value *V,
+                                                  unsigned int BuiltinID,
+                                                  CGBuilderTy &Builder,
+                                                  CodeGenModule &CGM) const {
+  assert(V->getType()->isFloatingPointTy() && "V should have an FP type.");
+  // Only use TDC in constrained FP mode.
+  if (!Builder.getIsFPConstrained())
+    return nullptr;
+
+  llvm::Type *Ty = V->getType();
+  if (Ty->isFloatTy() || Ty->isDoubleTy() || Ty->isFP128Ty()) {
+    llvm::Module &M = CGM.getModule();
+    auto &Ctx = M.getContext();
+    llvm::Function *TDCFunc =
+        llvm::Intrinsic::getDeclaration(&M, llvm::Intrinsic::s390_tdc, Ty);
+    unsigned TDCBits = 0;
+    switch (BuiltinID) {
+    case Builtin::BI__builtin_isnan:
+      TDCBits = 0xf;
+      break;
+    case Builtin::BIfinite:
+    case Builtin::BI__finite:
+    case Builtin::BIfinitef:
+    case Builtin::BI__finitef:
+    case Builtin::BIfinitel:
+    case Builtin::BI__finitel:
+    case Builtin::BI__builtin_isfinite:
+      TDCBits = 0xfc0;
+      break;
+    case Builtin::BI__builtin_isinf:
+      TDCBits = 0x30;
+      break;
+    default:
+      break;
+    }
+    if (TDCBits)
+      return Builder.CreateCall(
+          TDCFunc,
+          {V, llvm::ConstantInt::get(llvm::Type::getInt64Ty(Ctx), TDCBits)});
+  }
+  return nullptr;
+}
+
+bool SystemZTargetCodeGenInfo::isVectorTypeBased(const Type *Ty,
+                                                 bool IsParam) const {
+  if (!SeenTypes.insert(Ty).second)
+    return false;
+
+  if (IsParam) {
+    // A narrow (<16 bytes) vector will as a parameter also expose the ABI as
+    // it will be passed in a vector register. A wide (>16 bytes) vector will
+    // be passed via "hidden" pointer where any extra alignment is not
+    // required (per GCC).
+    const Type *SingleEltTy =
+        static_cast<const SystemZABIInfo &>(TargetCodeGenInfo::getABIInfo())
+            .GetSingleElementType(QualType(Ty, 0))
+            .getTypePtr();
+    bool SingleVecEltStruct =
+        SingleEltTy != Ty && SingleEltTy->isVectorType() &&
+        Ctx.getTypeSize(SingleEltTy) == Ctx.getTypeSize(Ty);
+    if (Ty->isVectorType() || SingleVecEltStruct)
+      return Ctx.getTypeSize(Ty) / 8 <= 16;
+  }
+
+  // Assume pointers are dereferenced.
+  while (Ty->isPointerType() || Ty->isArrayType())
+    Ty = Ty->getPointeeOrArrayElementType();
+
+  // Vectors >= 16 bytes expose the ABI through alignment requirements.
+  if (Ty->isVectorType() && Ctx.getTypeSize(Ty) / 8 >= 16)
+    return true;
+
+  if (const auto *RecordTy = Ty->getAs<RecordType>()) {
+    const RecordDecl *RD = RecordTy->getDecl();
+    if (const CXXRecordDecl *CXXRD = dyn_cast<CXXRecordDecl>(RD))
+      if (CXXRD->hasDefinition())
+        for (const auto &I : CXXRD->bases())
+          if (isVectorTypeBased(I.getType().getTypePtr(), /*IsParam*/ false))
+            return true;
+    for (const auto *FD : RD->fields())
+      if (isVectorTypeBased(FD->getType().getTypePtr(), /*IsParam*/ false))
+        return true;
+  }
+
+  if (const auto *FT = Ty->getAs<FunctionType>())
+    if (isVectorTypeBased(FT->getReturnType().getTypePtr(), /*IsParam*/ true))
+      return true;
+  if (const FunctionProtoType *Proto = Ty->getAs<FunctionProtoType>())
+    for (auto ParamType : Proto->getParamTypes())
+      if (isVectorTypeBased(ParamType.getTypePtr(), /*IsParam*/ true))
+        return true;
+
+  return false;
+}

clang/lib/CodeGen/Targets/TCE.h

+//===- TCE.h ----------------------------------------------------*- C++ -*-===//
+//
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
+//
+//===----------------------------------------------------------------------===//
+
+#ifndef LLVM_CLANG_LIB_CODEGEN_TARGETS_TCE_H
+#define LLVM_CLANG_LIB_CODEGEN_TARGETS_TCE_H
+
+#include "TargetInfo.h"
+
+namespace clang::CodeGen {
+
+class LLVM_LIBRARY_VISIBILITY TCETargetCodeGenInfo : public TargetCodeGenInfo {
+public:
+  TCETargetCodeGenInfo(CodeGenTypes &CGT);
+
+  void setTargetAttributes(const Decl *D, llvm::GlobalValue *GV,
+                           CodeGen::CodeGenModule &M) const override;
+};
+
+} // namespace clang::CodeGen
+
+#endif // LLVM_CLANG_LIB_CODEGEN_TARGETS_TCE_H

clang/lib/CodeGen/Targets/TCE.cpp

+//===- TCE.cpp ------------------------------------------------------------===//
+//
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
+//
+//===----------------------------------------------------------------------===//
+
+#include "TCE.h"
+#include "ABIInfoImpl.h"
+
+using namespace clang;
+using namespace clang::CodeGen;
+
+//===----------------------------------------------------------------------===//
+// TCE ABI Implementation (see http://tce.cs.tut.fi). Uses mostly the defaults.
+// Currently subclassed only to implement custom OpenCL C function attribute
+// handling.
+//===----------------------------------------------------------------------===//
+
+TCETargetCodeGenInfo::TCETargetCodeGenInfo(CodeGenTypes &CGT)
+    : TargetCodeGenInfo(std::make_unique<DefaultABIInfo>(CGT)) {}
+
+void TCETargetCodeGenInfo::setTargetAttributes(const Decl *D,
+                                               llvm::GlobalValue *GV,
+                                               CodeGenModule &M) const {
+  if (GV->isDeclaration())
+    return;
+  const FunctionDecl *FD = dyn_cast_or_null<FunctionDecl>(D);
+  if (!FD)
+    return;
+
+  llvm::Function *F = cast<llvm::Function>(GV);
+
+  if (M.getLangOpts().OpenCL) {
+    if (FD->hasAttr<OpenCLKernelAttr>()) {
+      // OpenCL C Kernel functions are not subject to inlining
+      F->addFnAttr(llvm::Attribute::NoInline);
+      const ReqdWorkGroupSizeAttr *Attr = FD->getAttr<ReqdWorkGroupSizeAttr>();
+      if (Attr) {
+        // Convert the reqd_work_group_size() attributes to metadata.
+        llvm::LLVMContext &Context = F->getContext();
+        llvm::NamedMDNode *OpenCLMetadata =
+            M.getModule().getOrInsertNamedMetadata(
+                "opencl.kernel_wg_size_info");
+
+        SmallVector<llvm::Metadata *, 5> Operands;
+        Operands.push_back(llvm::ConstantAsMetadata::get(F));
+
+        Operands.push_back(
+            llvm::ConstantAsMetadata::get(llvm::Constant::getIntegerValue(
+                M.Int32Ty, llvm::APInt(32, Attr->getXDim()))));
+        Operands.push_back(
+            llvm::ConstantAsMetadata::get(llvm::Constant::getIntegerValue(
+                M.Int32Ty, llvm::APInt(32, Attr->getYDim()))));
+        Operands.push_back(
+            llvm::ConstantAsMetadata::get(llvm::Constant::getIntegerValue(
+                M.Int32Ty, llvm::APInt(32, Attr->getZDim()))));
+
+        // Add a boolean constant operand for "required" (true) or "hint"
+        // (false) for implementing the work_group_size_hint attr later.
+        // Currently always true as the hint is not yet implemented.
+        Operands.push_back(
+            llvm::ConstantAsMetadata::get(llvm::ConstantInt::getTrue(Context)));
+        OpenCLMetadata->addOperand(llvm::MDNode::get(Context, Operands));
+      }
+    }
+  }
+}

clang/lib/CodeGen/Targets/VE.h

+//===- VE.h -----------------------------------------------------*- C++ -*-===//
+//
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
+//
+//===----------------------------------------------------------------------===//
+
+#ifndef LLVM_CLANG_LIB_CODEGEN_TARGETS_VE_H
+#define LLVM_CLANG_LIB_CODEGEN_TARGETS_VE_H
+
+#include "TargetInfo.h"
+
+namespace clang::CodeGen {
+
+class LLVM_LIBRARY_VISIBILITY VETargetCodeGenInfo : public TargetCodeGenInfo {
+public:
+  VETargetCodeGenInfo(CodeGenTypes &CGT);
+  // VE ABI requires the arguments of variadic and prototype-less functions
+  // are passed in both registers and memory.
+  bool isNoProtoCallVariadic(const CallArgList &args,
+                             const FunctionNoProtoType *fnType) const override {
+    return true;
+  }
+};
+
+} // namespace clang::CodeGen
+
+#endif // LLVM_CLANG_LIB_CODEGEN_TARGETS_VE_H

clang/lib/CodeGen/Targets/VE.cpp

+//===- VE.cpp -------------------------------------------------------------===//
+//
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
+//
+//===----------------------------------------------------------------------===//
+
+#include "VE.h"
+#include "ABIInfoImpl.h"
+
+using namespace clang;
+using namespace clang::CodeGen;
+
+//===----------------------------------------------------------------------===//
+// VE ABI Implementation.
+//
+namespace {
+class VEABIInfo : public DefaultABIInfo {
+public:
+  VEABIInfo(CodeGenTypes &CGT) : DefaultABIInfo(CGT) {}
+
+private:
+  ABIArgInfo classifyReturnType(QualType RetTy) const;
+  ABIArgInfo classifyArgumentType(QualType RetTy) const;
+  void computeInfo(CGFunctionInfo &FI) const override;
+};
+} // end anonymous namespace
+
+ABIArgInfo VEABIInfo::classifyReturnType(QualType Ty) const {
+  if (Ty->isAnyComplexType())
+    return ABIArgInfo::getDirect();
+  uint64_t Size = getContext().getTypeSize(Ty);
+  if (Size < 64 && Ty->isIntegerType())
+    return ABIArgInfo::getExtend(Ty);
+  return DefaultABIInfo::classifyReturnType(Ty);
+}
+
+ABIArgInfo VEABIInfo::classifyArgumentType(QualType Ty) const {
+  if (Ty->isAnyComplexType())
+    return ABIArgInfo::getDirect();
+  uint64_t Size = getContext().getTypeSize(Ty);
+  if (Size < 64 && Ty->isIntegerType())
+    return ABIArgInfo::getExtend(Ty);
+  return DefaultABIInfo::classifyArgumentType(Ty);
+}
+
+void VEABIInfo::computeInfo(CGFunctionInfo &FI) const {
+  FI.getReturnInfo() = classifyReturnType(FI.getReturnType());
+  for (auto &Arg : FI.arguments())
+    Arg.info = classifyArgumentType(Arg.type);
+}
+
+VETargetCodeGenInfo::VETargetCodeGenInfo(CodeGenTypes &CGT)
+    : TargetCodeGenInfo(std::make_unique<VEABIInfo>(CGT)) {}

clang/lib/CodeGen/Targets/WebAssembly.h

+//===- WebAssembly.h --------------------------------------------*- C++ -*-===//
+//
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
+//
+//===----------------------------------------------------------------------===//
+
+#ifndef LLVM_CLANG_LIB_CODEGEN_TARGETS_WEBASSEMBLY_H
+#define LLVM_CLANG_LIB_CODEGEN_TARGETS_WEBASSEMBLY_H
+
+#include "TargetInfo.h"
+
+namespace clang::CodeGen {
+
+enum class WebAssemblyABIKind {
+  MVP = 0,
+  ExperimentalMV = 1,
+};
+
+class LLVM_LIBRARY_VISIBILITY WebAssemblyTargetCodeGenInfo final
+    : public TargetCodeGenInfo {
+public:
+  explicit WebAssemblyTargetCodeGenInfo(CodeGen::CodeGenTypes &CGT,
+                                        WebAssemblyABIKind K);
+
+  void setTargetAttributes(const Decl *D, llvm::GlobalValue *GV,
+                           CodeGen::CodeGenModule &CGM) const override;
+
+  /// Return the WebAssembly externref reference type.
+  virtual llvm::Type *getWasmExternrefReferenceType() const override;
+  /// Return the WebAssembly funcref reference type.
+  virtual llvm::Type *getWasmFuncrefReferenceType() const override;
+};
+
+} // namespace clang::CodeGen
+
+#endif // LLVM_CLANG_LIB_CODEGEN_TARGETS_WEBASSEMBLY_H

clang/lib/CodeGen/Targets/WebAssembly.cpp

+//===- WebAssembly.cpp ----------------------------------------------------===//
+//
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
+//
+//===----------------------------------------------------------------------===//
+
+#include "WebAssembly.h"
+#include "ABIInfoImpl.h"
+
+using namespace clang;
+using namespace clang::CodeGen;
+
+//===----------------------------------------------------------------------===//
+// WebAssembly ABI Implementation
+//
+// This is a very simple ABI that relies a lot on DefaultABIInfo.
+//===----------------------------------------------------------------------===//
+
+class WebAssemblyABIInfo final : public ABIInfo {
+  DefaultABIInfo defaultInfo;
+  WebAssemblyABIKind Kind;
+
+public:
+  explicit WebAssemblyABIInfo(CodeGen::CodeGenTypes &CGT,
+                              WebAssemblyABIKind Kind)
+      : ABIInfo(CGT), defaultInfo(CGT), Kind(Kind) {}
+
+private:
+  ABIArgInfo classifyReturnType(QualType RetTy) const;
+  ABIArgInfo classifyArgumentType(QualType Ty) const;
+
+  // DefaultABIInfo's classifyReturnType and classifyArgumentType are
+  // non-virtual, but computeInfo and EmitVAArg are virtual, so we
+  // overload them.
+  void computeInfo(CGFunctionInfo &FI) const override {
+    if (!getCXXABI().classifyReturnType(FI))
+      FI.getReturnInfo() = classifyReturnType(FI.getReturnType());
+    for (auto &Arg : FI.arguments())
+      Arg.info = classifyArgumentType(Arg.type);
+  }
+
+  Address EmitVAArg(CodeGenFunction &CGF, Address VAListAddr,
+                    QualType Ty) const override;
+};
+
+/// Classify argument of given type \p Ty.
+ABIArgInfo WebAssemblyABIInfo::classifyArgumentType(QualType Ty) const {
+  Ty = useFirstFieldIfTransparentUnion(Ty);
+
+  if (isAggregateTypeForABI(Ty)) {
+    // Records with non-trivial destructors/copy-constructors should not be
+    // passed by value.
+    if (auto RAA = getRecordArgABI(Ty, getCXXABI()))
+      return getNaturalAlignIndirect(Ty, RAA == CGCXXABI::RAA_DirectInMemory);
+    // Ignore empty structs/unions.
+    if (isEmptyRecord(getContext(), Ty, true))
+      return ABIArgInfo::getIgnore();
+    // Lower single-element structs to just pass a regular value. TODO: We
+    // could do reasonable-size multiple-element structs too, using getExpand(),
+    // though watch out for things like bitfields.
+    if (const Type *SeltTy = isSingleElementStruct(Ty, getContext()))
+      return ABIArgInfo::getDirect(CGT.ConvertType(QualType(SeltTy, 0)));
+    // For the experimental multivalue ABI, fully expand all other aggregates
+    if (Kind == WebAssemblyABIKind::ExperimentalMV) {
+      const RecordType *RT = Ty->getAs<RecordType>();
+      assert(RT);
+      bool HasBitField = false;
+      for (auto *Field : RT->getDecl()->fields()) {
+        if (Field->isBitField()) {
+          HasBitField = true;
+          break;
+        }
+      }
+      if (!HasBitField)
+        return ABIArgInfo::getExpand();
+    }
+  }
+
+  // Otherwise just do the default thing.
+  return defaultInfo.classifyArgumentType(Ty);
+}
+
+ABIArgInfo WebAssemblyABIInfo::classifyReturnType(QualType RetTy) const {
+  if (isAggregateTypeForABI(RetTy)) {
+    // Records with non-trivial destructors/copy-constructors should not be
+    // returned by value.
+    if (!getRecordArgABI(RetTy, getCXXABI())) {
+      // Ignore empty structs/unions.
+      if (isEmptyRecord(getContext(), RetTy, true))
+        return ABIArgInfo::getIgnore();
+      // Lower single-element structs to just return a regular value. TODO: We
+      // could do reasonable-size multiple-element structs too, using
+      // ABIArgInfo::getDirect().
+      if (const Type *SeltTy = isSingleElementStruct(RetTy, getContext()))
+        return ABIArgInfo::getDirect(CGT.ConvertType(QualType(SeltTy, 0)));
+      // For the experimental multivalue ABI, return all other aggregates
+      if (Kind == WebAssemblyABIKind::ExperimentalMV)
+        return ABIArgInfo::getDirect();
+    }
+  }
+
+  // Otherwise just do the default thing.
+  return defaultInfo.classifyReturnType(RetTy);
+}
+
+Address WebAssemblyABIInfo::EmitVAArg(CodeGenFunction &CGF, Address VAListAddr,
+                                      QualType Ty) const {
+  bool IsIndirect = isAggregateTypeForABI(Ty) &&
+                    !isEmptyRecord(getContext(), Ty, true) &&
+                    !isSingleElementStruct(Ty, getContext());
+  return emitVoidPtrVAArg(CGF, VAListAddr, Ty, IsIndirect,
+                          getContext().getTypeInfoInChars(Ty),
+                          CharUnits::fromQuantity(4),
+                          /*AllowHigherAlign=*/true);
+}
+
+WebAssemblyTargetCodeGenInfo::WebAssemblyTargetCodeGenInfo(CodeGenTypes &CGT,
+                                                           WebAssemblyABIKind K)
+    : TargetCodeGenInfo(std::make_unique<WebAssemblyABIInfo>(CGT, K)) {
+  SwiftInfo =
+      std::make_unique<SwiftABIInfo>(CGT, /*SwiftErrorInRegister=*/false);
+}
+
+void WebAssemblyTargetCodeGenInfo::setTargetAttributes(
+    const Decl *D, llvm::GlobalValue *GV, CodeGenModule &CGM) const {
+  TargetCodeGenInfo::setTargetAttributes(D, GV, CGM);
+  if (const auto *FD = dyn_cast_or_null<FunctionDecl>(D)) {
+    if (const auto *Attr = FD->getAttr<WebAssemblyImportModuleAttr>()) {
+      llvm::Function *Fn = cast<llvm::Function>(GV);
+      llvm::AttrBuilder B(GV->getContext());
+      B.addAttribute("wasm-import-module", Attr->getImportModule());
+      Fn->addFnAttrs(B);
+    }
+    if (const auto *Attr = FD->getAttr<WebAssemblyImportNameAttr>()) {
+      llvm::Function *Fn = cast<llvm::Function>(GV);
+      llvm::AttrBuilder B(GV->getContext());
+      B.addAttribute("wasm-import-name", Attr->getImportName());
+      Fn->addFnAttrs(B);
+    }
+    if (const auto *Attr = FD->getAttr<WebAssemblyExportNameAttr>()) {
+      llvm::Function *Fn = cast<llvm::Function>(GV);
+      llvm::AttrBuilder B(GV->getContext());
+      B.addAttribute("wasm-export-name", Attr->getExportName());
+      Fn->addFnAttrs(B);
+    }
+  }
+
+  if (auto *FD = dyn_cast_or_null<FunctionDecl>(D)) {
+    llvm::Function *Fn = cast<llvm::Function>(GV);
+    if (!FD->doesThisDeclarationHaveABody() && !FD->hasPrototype())
+      Fn->addFnAttr("no-prototype");
+  }
+}
+
+llvm::Type *
+WebAssemblyTargetCodeGenInfo::getWasmExternrefReferenceType() const {
+  return llvm::Type::getWasm_ExternrefTy(getABIInfo().getVMContext());
+}
+
+llvm::Type *WebAssemblyTargetCodeGenInfo::getWasmFuncrefReferenceType() const {
+  return llvm::Type::getWasm_FuncrefTy(getABIInfo().getVMContext());
+}

clang/lib/CodeGen/Targets/X86.h

+//===- X86.h ----------------------------------------------------*- C++ -*-===//
+//
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
+//
+//===----------------------------------------------------------------------===//
+
+#ifndef LLVM_CLANG_LIB_CODEGEN_TARGETS_X86_H
+#define LLVM_CLANG_LIB_CODEGEN_TARGETS_X86_H
+
+#include "TargetInfo.h"
+
+namespace clang::CodeGen {
+
+class LLVM_LIBRARY_VISIBILITY X86_32TargetCodeGenInfo
+    : public TargetCodeGenInfo {
+public:
+  X86_32TargetCodeGenInfo(CodeGen::CodeGenTypes &CGT, bool DarwinVectorABI,
+                          bool RetSmallStructInRegABI, bool Win32StructABI,
+                          unsigned NumRegisterParameters, bool SoftFloatABI);
+
+  static bool isStructReturnInRegABI(const llvm::Triple &Triple,
+                                     const CodeGenOptions &Opts);
+
+  void setTargetAttributes(const Decl *D, llvm::GlobalValue *GV,
+                           CodeGen::CodeGenModule &CGM) const override;
+
+  int getDwarfEHStackPointer(CodeGen::CodeGenModule &CGM) const override {
+    // Darwin uses different dwarf register numbers for EH.
+    if (CGM.getTarget().getTriple().isOSDarwin())
+      return 5;
+    return 4;
+  }
+
+  bool initDwarfEHRegSizeTable(CodeGen::CodeGenFunction &CGF,
+                               llvm::Value *Address) const override;
+
+  llvm::Type *adjustInlineAsmType(CodeGen::CodeGenFunction &CGF,
+                                  StringRef Constraint,
+                                  llvm::Type *Ty) const override;
+
+  void addReturnRegisterOutputs(CodeGenFunction &CGF, LValue ReturnValue,
+                                std::string &Constraints,
+                                std::vector<llvm::Type *> &ResultRegTypes,
+                                std::vector<llvm::Type *> &ResultTruncRegTypes,
+                                std::vector<LValue> &ResultRegDests,
+                                std::string &AsmString,
+                                unsigned NumOutputs) const override;
+
+  llvm::Constant *
+  getUBSanFunctionSignature(CodeGen::CodeGenModule &CGM) const override {
+    unsigned Sig = (0xeb << 0) | // jmp rel8
+                   (0x06 << 8) | //           .+0x08
+                   ('v' << 16) | ('2' << 24);
+    return llvm::ConstantInt::get(CGM.Int32Ty, Sig);
+  }
+
+  StringRef getARCRetainAutoreleasedReturnValueMarker() const override {
+    return "movl\t%ebp, %ebp"
+           "\t\t// marker for objc_retainAutoreleaseReturnValue";
+  }
+};
+
+/// The AVX ABI level for X86 targets.
+enum class X86AVXABILevel { None, AVX, AVX512 };
+
+class X86_64TargetCodeGenInfo : public TargetCodeGenInfo {
+public:
+  X86_64TargetCodeGenInfo(CodeGen::CodeGenTypes &CGT, X86AVXABILevel AVXLevel);
+
+  /// Disable tail call on x86-64. The epilogue code before the tail jump blocks
+  /// autoreleaseRV/retainRV and autoreleaseRV/unsafeClaimRV optimizations.
+  bool markARCOptimizedReturnCallsAsNoTail() const override { return true; }
+
+  int getDwarfEHStackPointer(CodeGen::CodeGenModule &CGM) const override {
+    return 7;
+  }
+
+  bool initDwarfEHRegSizeTable(CodeGen::CodeGenFunction &CGF,
+                               llvm::Value *Address) const override;
+
+  llvm::Type *adjustInlineAsmType(CodeGen::CodeGenFunction &CGF,
+                                  StringRef Constraint,
+                                  llvm::Type *Ty) const override;
+
+  bool isNoProtoCallVariadic(const CallArgList &args,
+                             const FunctionNoProtoType *fnType) const override;
+
+  llvm::Constant *
+  getUBSanFunctionSignature(CodeGen::CodeGenModule &CGM) const override {
+    unsigned Sig = (0xeb << 0) | // jmp rel8
+                   (0x06 << 8) | //           .+0x08
+                   ('v' << 16) | ('2' << 24);
+    return llvm::ConstantInt::get(CGM.Int32Ty, Sig);
+  }
+
+  void setTargetAttributes(const Decl *D, llvm::GlobalValue *GV,
+                           CodeGen::CodeGenModule &CGM) const override;
+
+  void checkFunctionCallABI(CodeGenModule &CGM, SourceLocation CallLoc,
+                            const FunctionDecl *Caller,
+                            const FunctionDecl *Callee,
+                            const CallArgList &Args) const override;
+};
+
+class WinX86_32TargetCodeGenInfo : public X86_32TargetCodeGenInfo {
+public:
+  WinX86_32TargetCodeGenInfo(CodeGen::CodeGenTypes &CGT, bool DarwinVectorABI,
+                             bool RetSmallStructInRegABI, bool Win32StructABI,
+                             unsigned NumRegisterParameters)
+      : X86_32TargetCodeGenInfo(CGT, DarwinVectorABI, RetSmallStructInRegABI,
+                                Win32StructABI, NumRegisterParameters, false) {}
+
+  void setTargetAttributes(const Decl *D, llvm::GlobalValue *GV,
+                           CodeGen::CodeGenModule &CGM) const override;
+
+  void getDependentLibraryOption(llvm::StringRef Lib,
+                                 llvm::SmallString<24> &Opt) const override;
+
+  void getDetectMismatchOption(llvm::StringRef Name, llvm::StringRef Value,
+                               llvm::SmallString<32> &Opt) const override {
+    Opt = "/FAILIFMISMATCH:\"" + Name.str() + "=" + Value.str() + "\"";
+  }
+};
+
+class WinX86_64TargetCodeGenInfo : public TargetCodeGenInfo {
+public:
+  WinX86_64TargetCodeGenInfo(CodeGen::CodeGenTypes &CGT,
+                             X86AVXABILevel AVXLevel);
+
+  void setTargetAttributes(const Decl *D, llvm::GlobalValue *GV,
+                           CodeGen::CodeGenModule &CGM) const override;
+
+  int getDwarfEHStackPointer(CodeGen::CodeGenModule &CGM) const override {
+    return 7;
+  }
+
+  bool initDwarfEHRegSizeTable(CodeGen::CodeGenFunction &CGF,
+                               llvm::Value *Address) const override;
+
+  void getDependentLibraryOption(llvm::StringRef Lib,
+                                 llvm::SmallString<24> &Opt) const override;
+
+  void getDetectMismatchOption(llvm::StringRef Name, llvm::StringRef Value,
+                               llvm::SmallString<32> &Opt) const override {
+    Opt = "/FAILIFMISMATCH:\"" + Name.str() + "=" + Value.str() + "\"";
+  }
+};
+
+} // namespace clang::CodeGen
+
+#endif // LLVM_CLANG_LIB_CODEGEN_TARGETS_X86_H

clang/lib/CodeGen/Targets/X86.cpp

+//===- X86.cpp ------------------------------------------------------------===//
+//
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
+//
+//===----------------------------------------------------------------------===//
+
+#include "X86.h"
+#include "ABIInfoImpl.h"
+#include "clang/Basic/DiagnosticFrontend.h"
+#include "llvm/ADT/SmallBitVector.h"
+
+using namespace clang;
+using namespace clang::CodeGen;
+
+/// IsX86_MMXType - Return true if this is an MMX type.
+static bool IsX86_MMXType(llvm::Type *IRType) {
+  // Return true if the type is an MMX type <2 x i32>, <4 x i16>, or <8 x i8>.
+  return IRType->isVectorTy() && IRType->getPrimitiveSizeInBits() == 64 &&
+         cast<llvm::VectorType>(IRType)->getElementType()->isIntegerTy() &&
+         IRType->getScalarSizeInBits() != 64;
+}
+
+static llvm::Type *X86AdjustInlineAsmType(CodeGen::CodeGenFunction &CGF,
+                                          StringRef Constraint,
+                                          llvm::Type *Ty) {
+  bool IsMMXCons = llvm::StringSwitch<bool>(Constraint)
+                       .Cases("y", "&y", "^Ym", true)
+                       .Default(false);
+  if (IsMMXCons && Ty->isVectorTy()) {
+    if (cast<llvm::VectorType>(Ty)->getPrimitiveSizeInBits().getFixedValue() !=
+        64) {
+      // Invalid MMX constraint
+      return nullptr;
+    }
+
+    return llvm::Type::getX86_MMXTy(CGF.getLLVMContext());
+  }
+
+  // No operation needed
+  return Ty;
+}
+
+/// Returns true if this type can be passed in SSE registers with the
+/// X86_VectorCall calling convention. Shared between x86_32 and x86_64.
+static bool isX86VectorTypeForVectorCall(ASTContext &Context, QualType Ty) {
+  if (const BuiltinType *BT = Ty->getAs<BuiltinType>()) {
+    if (BT->isFloatingPoint() && BT->getKind() != BuiltinType::Half) {
+      if (BT->getKind() == BuiltinType::LongDouble) {
+        if (&Context.getTargetInfo().getLongDoubleFormat() ==
+            &llvm::APFloat::x87DoubleExtended())
+          return false;
+      }
+      return true;
+    }
+  } else if (const VectorType *VT = Ty->getAs<VectorType>()) {
+    // vectorcall can pass XMM, YMM, and ZMM vectors. We don't pass SSE1 MMX
+    // registers specially.
+    unsigned VecSize = Context.getTypeSize(VT);
+    if (VecSize == 128 || VecSize == 256 || VecSize == 512)
+      return true;
+  }
+  return false;
+}
+
+/// Returns true if this aggregate is small enough to be passed in SSE registers
+/// in the X86_VectorCall calling convention. Shared between x86_32 and x86_64.
+static bool isX86VectorCallAggregateSmallEnough(uint64_t NumMembers) {
+  return NumMembers <= 4;
+}
+
+/// Returns a Homogeneous Vector Aggregate ABIArgInfo, used in X86.
+static ABIArgInfo getDirectX86Hva(llvm::Type *T = nullptr) {
+  auto AI = ABIArgInfo::getDirect(T);
+  AI.setInReg(true);
+  AI.setCanBeFlattened(false);
+  return AI;
+}
+
+//===----------------------------------------------------------------------===//
+// X86-32 ABI Implementation
+//===----------------------------------------------------------------------===//
+
+namespace {
+
+/// Similar to llvm::CCState, but for Clang.
+struct CCState {
+  CCState(CGFunctionInfo &FI)
+      : IsPreassigned(FI.arg_size()), CC(FI.getCallingConvention()) {}
+
+  llvm::SmallBitVector IsPreassigned;
+  unsigned CC = CallingConv::CC_C;
+  unsigned FreeRegs = 0;
+  unsigned FreeSSERegs = 0;
+};
+
+/// X86_32ABIInfo - The X86-32 ABI information.
+class X86_32ABIInfo : public ABIInfo {
+  enum Class { Integer, Float };
+
+  static const unsigned MinABIStackAlignInBytes = 4;
+
+  bool IsDarwinVectorABI;
+  bool IsRetSmallStructInRegABI;
+  bool IsWin32StructABI;
+  bool IsSoftFloatABI;
+  bool IsMCUABI;
+  bool IsLinuxABI;
+  unsigned DefaultNumRegisterParameters;
+
+  static bool isRegisterSize(unsigned Size) {
+    return (Size == 8 || Size == 16 || Size == 32 || Size == 64);
+  }
+
+  bool isHomogeneousAggregateBaseType(QualType Ty) const override {
+    // FIXME: Assumes vectorcall is in use.
+    return isX86VectorTypeForVectorCall(getContext(), Ty);
+  }
+
+  bool isHomogeneousAggregateSmallEnough(const Type *Ty,
+                                         uint64_t NumMembers) const override {
+    // FIXME: Assumes vectorcall is in use.
+    return isX86VectorCallAggregateSmallEnough(NumMembers);
+  }
+
+  bool shouldReturnTypeInRegister(QualType Ty, ASTContext &Context) const;
+
+  /// getIndirectResult - Give a source type \arg Ty, return a suitable result
+  /// such that the argument will be passed in memory.
+  ABIArgInfo getIndirectResult(QualType Ty, bool ByVal, CCState &State) const;
+
+  ABIArgInfo getIndirectReturnResult(QualType Ty, CCState &State) const;
+
+  /// Return the alignment to use for the given type on the stack.
+  unsigned getTypeStackAlignInBytes(QualType Ty, unsigned Align) const;
+
+  Class classify(QualType Ty) const;
+  ABIArgInfo classifyReturnType(QualType RetTy, CCState &State) const;
+  ABIArgInfo classifyArgumentType(QualType RetTy, CCState &State) const;
+
+  /// Updates the number of available free registers, returns
+  /// true if any registers were allocated.
+  bool updateFreeRegs(QualType Ty, CCState &State) const;
+
+  bool shouldAggregateUseDirect(QualType Ty, CCState &State, bool &InReg,
+                                bool &NeedsPadding) const;
+  bool shouldPrimitiveUseInReg(QualType Ty, CCState &State) const;
+
+  bool canExpandIndirectArgument(QualType Ty) const;
+
+  /// Rewrite the function info so that all memory arguments use
+  /// inalloca.
+  void rewriteWithInAlloca(CGFunctionInfo &FI) const;
+
+  void addFieldToArgStruct(SmallVector<llvm::Type *, 6> &FrameFields,
+                           CharUnits &StackOffset, ABIArgInfo &Info,
+                           QualType Type) const;
+  void runVectorCallFirstPass(CGFunctionInfo &FI, CCState &State) const;
+
+public:
+  void computeInfo(CGFunctionInfo &FI) const override;
+  Address EmitVAArg(CodeGenFunction &CGF, Address VAListAddr,
+                    QualType Ty) const override;
+
+  X86_32ABIInfo(CodeGen::CodeGenTypes &CGT, bool DarwinVectorABI,
+                bool RetSmallStructInRegABI, bool Win32StructABI,
+                unsigned NumRegisterParameters, bool SoftFloatABI)
+      : ABIInfo(CGT), IsDarwinVectorABI(DarwinVectorABI),
+        IsRetSmallStructInRegABI(RetSmallStructInRegABI),
+        IsWin32StructABI(Win32StructABI), IsSoftFloatABI(SoftFloatABI),
+        IsMCUABI(CGT.getTarget().getTriple().isOSIAMCU()),
+        IsLinuxABI(CGT.getTarget().getTriple().isOSLinux() ||
+                   CGT.getTarget().getTriple().isOSCygMing()),
+        DefaultNumRegisterParameters(NumRegisterParameters) {}
+};
+
+class X86_32SwiftABIInfo : public SwiftABIInfo {
+public:
+  explicit X86_32SwiftABIInfo(CodeGenTypes &CGT)
+      : SwiftABIInfo(CGT, /*SwiftErrorInRegister=*/false) {}
+
+  bool shouldPassIndirectly(ArrayRef<llvm::Type *> ComponentTys,
+                            bool AsReturnValue) const override {
+    // LLVM's x86-32 lowering currently only assigns up to three
+    // integer registers and three fp registers.  Oddly, it'll use up to
+    // four vector registers for vectors, but those can overlap with the
+    // scalar registers.
+    return occupiesMoreThan(ComponentTys, /*total=*/3);
+  }
+};
+
+} // namespace
+
+/// Rewrite input constraint references after adding some output constraints.
+/// In the case where there is one output and one input and we add one output,
+/// we need to replace all operand references greater than or equal to 1:
+///     mov $0, $1
+///     mov eax, $1
+/// The result will be:
+///     mov $0, $2
+///     mov eax, $2
+static void rewriteInputConstraintReferences(unsigned FirstIn,
+                                             unsigned NumNewOuts,
+                                             std::string &AsmString) {
+  std::string Buf;
+  llvm::raw_string_ostream OS(Buf);
+  size_t Pos = 0;
+  while (Pos < AsmString.size()) {
+    size_t DollarStart = AsmString.find('$', Pos);
+    if (DollarStart == std::string::npos)
+      DollarStart = AsmString.size();
+    size_t DollarEnd = AsmString.find_first_not_of('$', DollarStart);
+    if (DollarEnd == std::string::npos)
+      DollarEnd = AsmString.size();
+    OS << StringRef(&AsmString[Pos], DollarEnd - Pos);
+    Pos = DollarEnd;
+    size_t NumDollars = DollarEnd - DollarStart;
+    if (NumDollars % 2 != 0 && Pos < AsmString.size()) {
+      // We have an operand reference.
+      size_t DigitStart = Pos;
+      if (AsmString[DigitStart] == '{') {
+        OS << '{';
+        ++DigitStart;
+      }
+      size_t DigitEnd = AsmString.find_first_not_of("0123456789", DigitStart);
+      if (DigitEnd == std::string::npos)
+        DigitEnd = AsmString.size();
+      StringRef OperandStr(&AsmString[DigitStart], DigitEnd - DigitStart);
+      unsigned OperandIndex;
+      if (!OperandStr.getAsInteger(10, OperandIndex)) {
+        if (OperandIndex >= FirstIn)
+          OperandIndex += NumNewOuts;
+        OS << OperandIndex;
+      } else {
+        OS << OperandStr;
+      }
+      Pos = DigitEnd;
+    }
+  }
+  AsmString = std::move(OS.str());
+}
+
+/// Add output constraints for EAX:EDX because they are return registers.
+void X86_32TargetCodeGenInfo::addReturnRegisterOutputs(
+    CodeGenFunction &CGF, LValue ReturnSlot, std::string &Constraints,
+    std::vector<llvm::Type *> &ResultRegTypes,
+    std::vector<llvm::Type *> &ResultTruncRegTypes,
+    std::vector<LValue> &ResultRegDests, std::string &AsmString,
+    unsigned NumOutputs) const {
+  uint64_t RetWidth = CGF.getContext().getTypeSize(ReturnSlot.getType());
+
+  // Use the EAX constraint if the width is 32 or smaller and EAX:EDX if it is
+  // larger.
+  if (!Constraints.empty())
+    Constraints += ',';
+  if (RetWidth <= 32) {
+    Constraints += "={eax}";
+    ResultRegTypes.push_back(CGF.Int32Ty);
+  } else {
+    // Use the 'A' constraint for EAX:EDX.
+    Constraints += "=A";
+    ResultRegTypes.push_back(CGF.Int64Ty);
+  }
+
+  // Truncate EAX or EAX:EDX to an integer of the appropriate size.
+  llvm::Type *CoerceTy = llvm::IntegerType::get(CGF.getLLVMContext(), RetWidth);
+  ResultTruncRegTypes.push_back(CoerceTy);
+
+  // Coerce the integer by bitcasting the return slot pointer.
+  ReturnSlot.setAddress(
+      CGF.Builder.CreateElementBitCast(ReturnSlot.getAddress(CGF), CoerceTy));
+  ResultRegDests.push_back(ReturnSlot);
+
+  rewriteInputConstraintReferences(NumOutputs, 1, AsmString);
+}
+
+/// shouldReturnTypeInRegister - Determine if the given type should be
+/// returned in a register (for the Darwin and MCU ABI).
+bool X86_32ABIInfo::shouldReturnTypeInRegister(QualType Ty,
+                                               ASTContext &Context) const {
+  uint64_t Size = Context.getTypeSize(Ty);
+
+  // For i386, type must be register sized.
+  // For the MCU ABI, it only needs to be <= 8-byte
+  if ((IsMCUABI && Size > 64) || (!IsMCUABI && !isRegisterSize(Size)))
+    return false;
+
+  if (Ty->isVectorType()) {
+    // 64- and 128- bit vectors inside structures are not returned in
+    // registers.
+    if (Size == 64 || Size == 128)
+      return false;
+
+    return true;
+  }
+
+  // If this is a builtin, pointer, enum, complex type, member pointer, or
+  // member function pointer it is ok.
+  if (Ty->getAs<BuiltinType>() || Ty->hasPointerRepresentation() ||
+      Ty->isAnyComplexType() || Ty->isEnumeralType() ||
+      Ty->isBlockPointerType() || Ty->isMemberPointerType())
+    return true;
+
+  // Arrays are treated like records.
+  if (const ConstantArrayType *AT = Context.getAsConstantArrayType(Ty))
+    return shouldReturnTypeInRegister(AT->getElementType(), Context);
+
+  // Otherwise, it must be a record type.
+  const RecordType *RT = Ty->getAs<RecordType>();
+  if (!RT)
+    return false;
+
+  // FIXME: Traverse bases here too.
+
+  // Structure types are passed in register if all fields would be
+  // passed in a register.
+  for (const auto *FD : RT->getDecl()->fields()) {
+    // Empty fields are ignored.
+    if (isEmptyField(Context, FD, true))
+      continue;
+
+    // Check fields recursively.
+    if (!shouldReturnTypeInRegister(FD->getType(), Context))
+      return false;
+  }
+  return true;
+}
+
+static bool is32Or64BitBasicType(QualType Ty, ASTContext &Context) {
+  // Treat complex types as the element type.
+  if (const ComplexType *CTy = Ty->getAs<ComplexType>())
+    Ty = CTy->getElementType();
+
+  // Check for a type which we know has a simple scalar argument-passing
+  // convention without any padding.  (We're specifically looking for 32
+  // and 64-bit integer and integer-equivalents, float, and double.)
+  if (!Ty->getAs<BuiltinType>() && !Ty->hasPointerRepresentation() &&
+      !Ty->isEnumeralType() && !Ty->isBlockPointerType())
+    return false;
+
+  uint64_t Size = Context.getTypeSize(Ty);
+  return Size == 32 || Size == 64;
+}
+
+static bool addFieldSizes(ASTContext &Context, const RecordDecl *RD,
+                          uint64_t &Size) {
+  for (const auto *FD : RD->fields()) {
+    // Scalar arguments on the stack get 4 byte alignment on x86. If the
+    // argument is smaller than 32-bits, expanding the struct will create
+    // alignment padding.
+    if (!is32Or64BitBasicType(FD->getType(), Context))
+      return false;
+
+    // FIXME: Reject bit-fields wholesale; there are two problems, we don't know
+    // how to expand them yet, and the predicate for telling if a bitfield still
+    // counts as "basic" is more complicated than what we were doing previously.
+    if (FD->isBitField())
+      return false;
+
+    Size += Context.getTypeSize(FD->getType());
+  }
+  return true;
+}
+
+static bool addBaseAndFieldSizes(ASTContext &Context, const CXXRecordDecl *RD,
+                                 uint64_t &Size) {
+  // Don't do this if there are any non-empty bases.
+  for (const CXXBaseSpecifier &Base : RD->bases()) {
+    if (!addBaseAndFieldSizes(Context, Base.getType()->getAsCXXRecordDecl(),
+                              Size))
+      return false;
+  }
+  if (!addFieldSizes(Context, RD, Size))
+    return false;
+  return true;
+}
+
+/// Test whether an argument type which is to be passed indirectly (on the
+/// stack) would have the equivalent layout if it was expanded into separate
+/// arguments. If so, we prefer to do the latter to avoid inhibiting
+/// optimizations.
+bool X86_32ABIInfo::canExpandIndirectArgument(QualType Ty) const {
+  // We can only expand structure types.
+  const RecordType *RT = Ty->getAs<RecordType>();
+  if (!RT)
+    return false;
+  const RecordDecl *RD = RT->getDecl();
+  uint64_t Size = 0;
+  if (const CXXRecordDecl *CXXRD = dyn_cast<CXXRecordDecl>(RD)) {
+    if (!IsWin32StructABI) {
+      // On non-Windows, we have to conservatively match our old bitcode
+      // prototypes in order to be ABI-compatible at the bitcode level.
+      if (!CXXRD->isCLike())
+        return false;
+    } else {
+      // Don't do this for dynamic classes.
+      if (CXXRD->isDynamicClass())
+        return false;
+    }
+    if (!addBaseAndFieldSizes(getContext(), CXXRD, Size))
+      return false;
+  } else {
+    if (!addFieldSizes(getContext(), RD, Size))
+      return false;
+  }
+
+  // We can do this if there was no alignment padding.
+  return Size == getContext().getTypeSize(Ty);
+}
+
+ABIArgInfo X86_32ABIInfo::getIndirectReturnResult(QualType RetTy,
+                                                  CCState &State) const {
+  // If the return value is indirect, then the hidden argument is consuming one
+  // integer register.
+  if (State.FreeRegs) {
+    --State.FreeRegs;
+    if (!IsMCUABI)
+      return getNaturalAlignIndirectInReg(RetTy);
+  }
+  return getNaturalAlignIndirect(RetTy, /*ByVal=*/false);
+}
+
+ABIArgInfo X86_32ABIInfo::classifyReturnType(QualType RetTy,
+                                             CCState &State) const {
+  if (RetTy->isVoidType())
+    return ABIArgInfo::getIgnore();
+
+  const Type *Base = nullptr;
+  uint64_t NumElts = 0;
+  if ((State.CC == llvm::CallingConv::X86_VectorCall ||
+       State.CC == llvm::CallingConv::X86_RegCall) &&
+      isHomogeneousAggregate(RetTy, Base, NumElts)) {
+    // The LLVM struct type for such an aggregate should lower properly.
+    return ABIArgInfo::getDirect();
+  }
+
+  if (const VectorType *VT = RetTy->getAs<VectorType>()) {
+    // On Darwin, some vectors are returned in registers.
+    if (IsDarwinVectorABI) {
+      uint64_t Size = getContext().getTypeSize(RetTy);
+
+      // 128-bit vectors are a special case; they are returned in
+      // registers and we need to make sure to pick a type the LLVM
+      // backend will like.
+      if (Size == 128)
+        return ABIArgInfo::getDirect(llvm::FixedVectorType::get(
+            llvm::Type::getInt64Ty(getVMContext()), 2));
+
+      // Always return in register if it fits in a general purpose
+      // register, or if it is 64 bits and has a single element.
+      if ((Size == 8 || Size == 16 || Size == 32) ||
+          (Size == 64 && VT->getNumElements() == 1))
+        return ABIArgInfo::getDirect(
+            llvm::IntegerType::get(getVMContext(), Size));
+
+      return getIndirectReturnResult(RetTy, State);
+    }
+
+    return ABIArgInfo::getDirect();
+  }
+
+  if (isAggregateTypeForABI(RetTy)) {
+    if (const RecordType *RT = RetTy->getAs<RecordType>()) {
+      // Structures with flexible arrays are always indirect.
+      if (RT->getDecl()->hasFlexibleArrayMember())
+        return getIndirectReturnResult(RetTy, State);
+    }
+
+    // If specified, structs and unions are always indirect.
+    if (!IsRetSmallStructInRegABI && !RetTy->isAnyComplexType())
+      return getIndirectReturnResult(RetTy, State);
+
+    // Ignore empty structs/unions.
+    if (isEmptyRecord(getContext(), RetTy, true))
+      return ABIArgInfo::getIgnore();
+
+    // Return complex of _Float16 as <2 x half> so the backend will use xmm0.
+    if (const ComplexType *CT = RetTy->getAs<ComplexType>()) {
+      QualType ET = getContext().getCanonicalType(CT->getElementType());
+      if (ET->isFloat16Type())
+        return ABIArgInfo::getDirect(llvm::FixedVectorType::get(
+            llvm::Type::getHalfTy(getVMContext()), 2));
+    }
+
+    // Small structures which are register sized are generally returned
+    // in a register.
+    if (shouldReturnTypeInRegister(RetTy, getContext())) {
+      uint64_t Size = getContext().getTypeSize(RetTy);
+
+      // As a special-case, if the struct is a "single-element" struct, and
+      // the field is of type "float" or "double", return it in a
+      // floating-point register. (MSVC does not apply this special case.)
+      // We apply a similar transformation for pointer types to improve the
+      // quality of the generated IR.
+      if (const Type *SeltTy = isSingleElementStruct(RetTy, getContext()))
+        if ((!IsWin32StructABI && SeltTy->isRealFloatingType()) ||
+            SeltTy->hasPointerRepresentation())
+          return ABIArgInfo::getDirect(CGT.ConvertType(QualType(SeltTy, 0)));
+
+      // FIXME: We should be able to narrow this integer in cases with dead
+      // padding.
+      return ABIArgInfo::getDirect(
+          llvm::IntegerType::get(getVMContext(), Size));
+    }
+
+    return getIndirectReturnResult(RetTy, State);
+  }
+
+  // Treat an enum type as its underlying type.
+  if (const EnumType *EnumTy = RetTy->getAs<EnumType>())
+    RetTy = EnumTy->getDecl()->getIntegerType();
+
+  if (const auto *EIT = RetTy->getAs<BitIntType>())
+    if (EIT->getNumBits() > 64)
+      return getIndirectReturnResult(RetTy, State);
+
+  return (isPromotableIntegerTypeForABI(RetTy) ? ABIArgInfo::getExtend(RetTy)
+                                               : ABIArgInfo::getDirect());
+}
+
+unsigned X86_32ABIInfo::getTypeStackAlignInBytes(QualType Ty,
+                                                 unsigned Align) const {
+  // Otherwise, if the alignment is less than or equal to the minimum ABI
+  // alignment, just use the default; the backend will handle this.
+  if (Align <= MinABIStackAlignInBytes)
+    return 0; // Use default alignment.
+
+  if (IsLinuxABI) {
+    // Exclude other System V OS (e.g Darwin, PS4 and FreeBSD) since we don't
+    // want to spend any effort dealing with the ramifications of ABI breaks.
+    //
+    // If the vector type is __m128/__m256/__m512, return the default alignment.
+    if (Ty->isVectorType() && (Align == 16 || Align == 32 || Align == 64))
+      return Align;
+  }
+  // On non-Darwin, the stack type alignment is always 4.
+  if (!IsDarwinVectorABI) {
+    // Set explicit alignment, since we may need to realign the top.
+    return MinABIStackAlignInBytes;
+  }
+
+  // Otherwise, if the type contains an SSE vector type, the alignment is 16.
+  if (Align >= 16 && (isSIMDVectorType(getContext(), Ty) ||
+                      isRecordWithSIMDVectorType(getContext(), Ty)))
+    return 16;
+
+  return MinABIStackAlignInBytes;
+}
+
+ABIArgInfo X86_32ABIInfo::getIndirectResult(QualType Ty, bool ByVal,
+                                            CCState &State) const {
+  if (!ByVal) {
+    if (State.FreeRegs) {
+      --State.FreeRegs; // Non-byval indirects just use one pointer.
+      if (!IsMCUABI)
+        return getNaturalAlignIndirectInReg(Ty);
+    }
+    return getNaturalAlignIndirect(Ty, false);
+  }
+
+  // Compute the byval alignment.
+  unsigned TypeAlign = getContext().getTypeAlign(Ty) / 8;
+  unsigned StackAlign = getTypeStackAlignInBytes(Ty, TypeAlign);
+  if (StackAlign == 0)
+    return ABIArgInfo::getIndirect(CharUnits::fromQuantity(4), /*ByVal=*/true);
+
+  // If the stack alignment is less than the type alignment, realign the
+  // argument.
+  bool Realign = TypeAlign > StackAlign;
+  return ABIArgInfo::getIndirect(CharUnits::fromQuantity(StackAlign),
+                                 /*ByVal=*/true, Realign);
+}
+
+X86_32ABIInfo::Class X86_32ABIInfo::classify(QualType Ty) const {
+  const Type *T = isSingleElementStruct(Ty, getContext());
+  if (!T)
+    T = Ty.getTypePtr();
+
+  if (const BuiltinType *BT = T->getAs<BuiltinType>()) {
+    BuiltinType::Kind K = BT->getKind();
+    if (K == BuiltinType::Float || K == BuiltinType::Double)
+      return Float;
+  }
+  return Integer;
+}
+
+bool X86_32ABIInfo::updateFreeRegs(QualType Ty, CCState &State) const {
+  if (!IsSoftFloatABI) {
+    Class C = classify(Ty);
+    if (C == Float)
+      return false;
+  }
+
+  unsigned Size = getContext().getTypeSize(Ty);
+  unsigned SizeInRegs = (Size + 31) / 32;
+
+  if (SizeInRegs == 0)
+    return false;
+
+  if (!IsMCUABI) {
+    if (SizeInRegs > State.FreeRegs) {
+      State.FreeRegs = 0;
+      return false;
+    }
+  } else {
+    // The MCU psABI allows passing parameters in-reg even if there are
+    // earlier parameters that are passed on the stack. Also,
+    // it does not allow passing >8-byte structs in-register,
+    // even if there are 3 free registers available.
+    if (SizeInRegs > State.FreeRegs || SizeInRegs > 2)
+      return false;
+  }
+
+  State.FreeRegs -= SizeInRegs;
+  return true;
+}
+
+bool X86_32ABIInfo::shouldAggregateUseDirect(QualType Ty, CCState &State,
+                                             bool &InReg,
+                                             bool &NeedsPadding) const {
+  // On Windows, aggregates other than HFAs are never passed in registers, and
+  // they do not consume register slots. Homogenous floating-point aggregates
+  // (HFAs) have already been dealt with at this point.
+  if (IsWin32StructABI && isAggregateTypeForABI(Ty))
+    return false;
+
+  NeedsPadding = false;
+  InReg = !IsMCUABI;
+
+  if (!updateFreeRegs(Ty, State))
+    return false;
+
+  if (IsMCUABI)
+    return true;
+
+  if (State.CC == llvm::CallingConv::X86_FastCall ||
+      State.CC == llvm::CallingConv::X86_VectorCall ||
+      State.CC == llvm::CallingConv::X86_RegCall) {
+    if (getContext().getTypeSize(Ty) <= 32 && State.FreeRegs)
+      NeedsPadding = true;
+
+    return false;
+  }
+
+  return true;
+}
+
+bool X86_32ABIInfo::shouldPrimitiveUseInReg(QualType Ty, CCState &State) const {
+  bool IsPtrOrInt = (getContext().getTypeSize(Ty) <= 32) &&
+                    (Ty->isIntegralOrEnumerationType() || Ty->isPointerType() ||
+                     Ty->isReferenceType());
+
+  if (!IsPtrOrInt && (State.CC == llvm::CallingConv::X86_FastCall ||
+                      State.CC == llvm::CallingConv::X86_VectorCall))
+    return false;
+
+  if (!updateFreeRegs(Ty, State))
+    return false;
+
+  if (!IsPtrOrInt && State.CC == llvm::CallingConv::X86_RegCall)
+    return false;
+
+  // Return true to apply inreg to all legal parameters except for MCU targets.
+  return !IsMCUABI;
+}
+
+void X86_32ABIInfo::runVectorCallFirstPass(CGFunctionInfo &FI,
+                                           CCState &State) const {
+  // Vectorcall x86 works subtly different than in x64, so the format is
+  // a bit different than the x64 version.  First, all vector types (not HVAs)
+  // are assigned, with the first 6 ending up in the [XYZ]MM0-5 registers.
+  // This differs from the x64 implementation, where the first 6 by INDEX get
+  // registers.
+  // In the second pass over the arguments, HVAs are passed in the remaining
+  // vector registers if possible, or indirectly by address. The address will be
+  // passed in ECX/EDX if available. Any other arguments are passed according to
+  // the usual fastcall rules.
+  MutableArrayRef<CGFunctionInfoArgInfo> Args = FI.arguments();
+  for (int I = 0, E = Args.size(); I < E; ++I) {
+    const Type *Base = nullptr;
+    uint64_t NumElts = 0;
+    const QualType &Ty = Args[I].type;
+    if ((Ty->isVectorType() || Ty->isBuiltinType()) &&
+        isHomogeneousAggregate(Ty, Base, NumElts)) {
+      if (State.FreeSSERegs >= NumElts) {
+        State.FreeSSERegs -= NumElts;
+        Args[I].info = ABIArgInfo::getDirectInReg();
+        State.IsPreassigned.set(I);
+      }
+    }
+  }
+}
+
+ABIArgInfo X86_32ABIInfo::classifyArgumentType(QualType Ty,
+                                               CCState &State) const {
+  // FIXME: Set alignment on indirect arguments.
+  bool IsFastCall = State.CC == llvm::CallingConv::X86_FastCall;
+  bool IsRegCall = State.CC == llvm::CallingConv::X86_RegCall;
+  bool IsVectorCall = State.CC == llvm::CallingConv::X86_VectorCall;
+
+  Ty = useFirstFieldIfTransparentUnion(Ty);
+  TypeInfo TI = getContext().getTypeInfo(Ty);
+
+  // Check with the C++ ABI first.
+  const RecordType *RT = Ty->getAs<RecordType>();
+  if (RT) {
+    CGCXXABI::RecordArgABI RAA = getRecordArgABI(RT, getCXXABI());
+    if (RAA == CGCXXABI::RAA_Indirect) {
+      return getIndirectResult(Ty, false, State);
+    } else if (RAA == CGCXXABI::RAA_DirectInMemory) {
+      // The field index doesn't matter, we'll fix it up later.
+      return ABIArgInfo::getInAlloca(/*FieldIndex=*/0);
+    }
+  }
+
+  // Regcall uses the concept of a homogenous vector aggregate, similar
+  // to other targets.
+  const Type *Base = nullptr;
+  uint64_t NumElts = 0;
+  if ((IsRegCall || IsVectorCall) &&
+      isHomogeneousAggregate(Ty, Base, NumElts)) {
+    if (State.FreeSSERegs >= NumElts) {
+      State.FreeSSERegs -= NumElts;
+
+      // Vectorcall passes HVAs directly and does not flatten them, but regcall
+      // does.
+      if (IsVectorCall)
+        return getDirectX86Hva();
+
+      if (Ty->isBuiltinType() || Ty->isVectorType())
+        return ABIArgInfo::getDirect();
+      return ABIArgInfo::getExpand();
+    }
+    return getIndirectResult(Ty, /*ByVal=*/false, State);
+  }
+
+  if (isAggregateTypeForABI(Ty)) {
+    // Structures with flexible arrays are always indirect.
+    // FIXME: This should not be byval!
+    if (RT && RT->getDecl()->hasFlexibleArrayMember())
+      return getIndirectResult(Ty, true, State);
+
+    // Ignore empty structs/unions on non-Windows.
+    if (!IsWin32StructABI && isEmptyRecord(getContext(), Ty, true))
+      return ABIArgInfo::getIgnore();
+
+    llvm::LLVMContext &LLVMContext = getVMContext();
+    llvm::IntegerType *Int32 = llvm::Type::getInt32Ty(LLVMContext);
+    bool NeedsPadding = false;
+    bool InReg;
+    if (shouldAggregateUseDirect(Ty, State, InReg, NeedsPadding)) {
+      unsigned SizeInRegs = (TI.Width + 31) / 32;
+      SmallVector<llvm::Type *, 3> Elements(SizeInRegs, Int32);
+      llvm::Type *Result = llvm::StructType::get(LLVMContext, Elements);
+      if (InReg)
+        return ABIArgInfo::getDirectInReg(Result);
+      else
+        return ABIArgInfo::getDirect(Result);
+    }
+    llvm::IntegerType *PaddingType = NeedsPadding ? Int32 : nullptr;
+
+    // Pass over-aligned aggregates on Windows indirectly. This behavior was
+    // added in MSVC 2015.
+    if (IsWin32StructABI && TI.isAlignRequired() && TI.Align > 32)
+      return getIndirectResult(Ty, /*ByVal=*/false, State);
+
+    // Expand small (<= 128-bit) record types when we know that the stack layout
+    // of those arguments will match the struct. This is important because the
+    // LLVM backend isn't smart enough to remove byval, which inhibits many
+    // optimizations.
+    // Don't do this for the MCU if there are still free integer registers
+    // (see X86_64 ABI for full explanation).
+    if (TI.Width <= 4 * 32 && (!IsMCUABI || State.FreeRegs == 0) &&
+        canExpandIndirectArgument(Ty))
+      return ABIArgInfo::getExpandWithPadding(
+          IsFastCall || IsVectorCall || IsRegCall, PaddingType);
+
+    return getIndirectResult(Ty, true, State);
+  }
+
+  if (const VectorType *VT = Ty->getAs<VectorType>()) {
+    // On Windows, vectors are passed directly if registers are available, or
+    // indirectly if not. This avoids the need to align argument memory. Pass
+    // user-defined vector types larger than 512 bits indirectly for simplicity.
+    if (IsWin32StructABI) {
+      if (TI.Width <= 512 && State.FreeSSERegs > 0) {
+        --State.FreeSSERegs;
+        return ABIArgInfo::getDirectInReg();
+      }
+      return getIndirectResult(Ty, /*ByVal=*/false, State);
+    }
+
+    // On Darwin, some vectors are passed in memory, we handle this by passing
+    // it as an i8/i16/i32/i64.
+    if (IsDarwinVectorABI) {
+      if ((TI.Width == 8 || TI.Width == 16 || TI.Width == 32) ||
+          (TI.Width == 64 && VT->getNumElements() == 1))
+        return ABIArgInfo::getDirect(
+            llvm::IntegerType::get(getVMContext(), TI.Width));
+    }
+
+    if (IsX86_MMXType(CGT.ConvertType(Ty)))
+      return ABIArgInfo::getDirect(llvm::IntegerType::get(getVMContext(), 64));
+
+    return ABIArgInfo::getDirect();
+  }
+
+  if (const EnumType *EnumTy = Ty->getAs<EnumType>())
+    Ty = EnumTy->getDecl()->getIntegerType();
+
+  bool InReg = shouldPrimitiveUseInReg(Ty, State);
+
+  if (isPromotableIntegerTypeForABI(Ty)) {
+    if (InReg)
+      return ABIArgInfo::getExtendInReg(Ty);
+    return ABIArgInfo::getExtend(Ty);
+  }
+
+  if (const auto *EIT = Ty->getAs<BitIntType>()) {
+    if (EIT->getNumBits() <= 64) {
+      if (InReg)
+        return ABIArgInfo::getDirectInReg();
+      return ABIArgInfo::getDirect();
+    }
+    return getIndirectResult(Ty, /*ByVal=*/false, State);
+  }
+
+  if (InReg)
+    return ABIArgInfo::getDirectInReg();
+  return ABIArgInfo::getDirect();
+}
+
+void X86_32ABIInfo::computeInfo(CGFunctionInfo &FI) const {
+  CCState State(FI);
+  if (IsMCUABI)
+    State.FreeRegs = 3;
+  else if (State.CC == llvm::CallingConv::X86_FastCall) {
+    State.FreeRegs = 2;
+    State.FreeSSERegs = 3;
+  } else if (State.CC == llvm::CallingConv::X86_VectorCall) {
+    State.FreeRegs = 2;
+    State.FreeSSERegs = 6;
+  } else if (FI.getHasRegParm())
+    State.FreeRegs = FI.getRegParm();
+  else if (State.CC == llvm::CallingConv::X86_RegCall) {
+    State.FreeRegs = 5;
+    State.FreeSSERegs = 8;
+  } else if (IsWin32StructABI) {
+    // Since MSVC 2015, the first three SSE vectors have been passed in
+    // registers. The rest are passed indirectly.
+    State.FreeRegs = DefaultNumRegisterParameters;
+    State.FreeSSERegs = 3;
+  } else
+    State.FreeRegs = DefaultNumRegisterParameters;
+
+  if (!::classifyReturnType(getCXXABI(), FI, *this)) {
+    FI.getReturnInfo() = classifyReturnType(FI.getReturnType(), State);
+  } else if (FI.getReturnInfo().isIndirect()) {
+    // The C++ ABI is not aware of register usage, so we have to check if the
+    // return value was sret and put it in a register ourselves if appropriate.
+    if (State.FreeRegs) {
+      --State.FreeRegs; // The sret parameter consumes a register.
+      if (!IsMCUABI)
+        FI.getReturnInfo().setInReg(true);
+    }
+  }
+
+  // The chain argument effectively gives us another free register.
+  if (FI.isChainCall())
+    ++State.FreeRegs;
+
+  // For vectorcall, do a first pass over the arguments, assigning FP and vector
+  // arguments to XMM registers as available.
+  if (State.CC == llvm::CallingConv::X86_VectorCall)
+    runVectorCallFirstPass(FI, State);
+
+  bool UsedInAlloca = false;
+  MutableArrayRef<CGFunctionInfoArgInfo> Args = FI.arguments();
+  for (int I = 0, E = Args.size(); I < E; ++I) {
+    // Skip arguments that have already been assigned.
+    if (State.IsPreassigned.test(I))
+      continue;
+
+    Args[I].info = classifyArgumentType(Args[I].type, State);
+    UsedInAlloca |= (Args[I].info.getKind() == ABIArgInfo::InAlloca);
+  }
+
+  // If we needed to use inalloca for any argument, do a second pass and rewrite
+  // all the memory arguments to use inalloca.
+  if (UsedInAlloca)
+    rewriteWithInAlloca(FI);
+}
+
+void X86_32ABIInfo::addFieldToArgStruct(
+    SmallVector<llvm::Type *, 6> &FrameFields, CharUnits &StackOffset,
+    ABIArgInfo &Info, QualType Type) const {
+  // Arguments are always 4-byte-aligned.
+  CharUnits WordSize = CharUnits::fromQuantity(4);
+  assert(StackOffset.isMultipleOf(WordSize) && "unaligned inalloca struct");
+
+  // sret pointers and indirect things will require an extra pointer
+  // indirection, unless they are byval. Most things are byval, and will not
+  // require this indirection.
+  bool IsIndirect = false;
+  if (Info.isIndirect() && !Info.getIndirectByVal())
+    IsIndirect = true;
+  Info = ABIArgInfo::getInAlloca(FrameFields.size(), IsIndirect);
+  llvm::Type *LLTy = CGT.ConvertTypeForMem(Type);
+  if (IsIndirect)
+    LLTy = LLTy->getPointerTo(0);
+  FrameFields.push_back(LLTy);
+  StackOffset += IsIndirect ? WordSize : getContext().getTypeSizeInChars(Type);
+
+  // Insert padding bytes to respect alignment.
+  CharUnits FieldEnd = StackOffset;
+  StackOffset = FieldEnd.alignTo(WordSize);
+  if (StackOffset != FieldEnd) {
+    CharUnits NumBytes = StackOffset - FieldEnd;
+    llvm::Type *Ty = llvm::Type::getInt8Ty(getVMContext());
+    Ty = llvm::ArrayType::get(Ty, NumBytes.getQuantity());
+    FrameFields.push_back(Ty);
+  }
+}
+
+static bool isArgInAlloca(const ABIArgInfo &Info) {
+  // Leave ignored and inreg arguments alone.
+  switch (Info.getKind()) {
+  case ABIArgInfo::InAlloca:
+    return true;
+  case ABIArgInfo::Ignore:
+  case ABIArgInfo::IndirectAliased:
+    return false;
+  case ABIArgInfo::Indirect:
+  case ABIArgInfo::Direct:
+  case ABIArgInfo::Extend:
+    return !Info.getInReg();
+  case ABIArgInfo::Expand:
+  case ABIArgInfo::CoerceAndExpand:
+    // These are aggregate types which are never passed in registers when
+    // inalloca is involved.
+    return true;
+  }
+  llvm_unreachable("invalid enum");
+}
+
+void X86_32ABIInfo::rewriteWithInAlloca(CGFunctionInfo &FI) const {
+  assert(IsWin32StructABI && "inalloca only supported on win32");
+
+  // Build a packed struct type for all of the arguments in memory.
+  SmallVector<llvm::Type *, 6> FrameFields;
+
+  // The stack alignment is always 4.
+  CharUnits StackAlign = CharUnits::fromQuantity(4);
+
+  CharUnits StackOffset;
+  CGFunctionInfo::arg_iterator I = FI.arg_begin(), E = FI.arg_end();
+
+  // Put 'this' into the struct before 'sret', if necessary.
+  bool IsThisCall =
+      FI.getCallingConvention() == llvm::CallingConv::X86_ThisCall;
+  ABIArgInfo &Ret = FI.getReturnInfo();
+  if (Ret.isIndirect() && Ret.isSRetAfterThis() && !IsThisCall &&
+      isArgInAlloca(I->info)) {
+    addFieldToArgStruct(FrameFields, StackOffset, I->info, I->type);
+    ++I;
+  }
+
+  // Put the sret parameter into the inalloca struct if it's in memory.
+  if (Ret.isIndirect() && !Ret.getInReg()) {
+    addFieldToArgStruct(FrameFields, StackOffset, Ret, FI.getReturnType());
+    // On Windows, the hidden sret parameter is always returned in eax.
+    Ret.setInAllocaSRet(IsWin32StructABI);
+  }
+
+  // Skip the 'this' parameter in ecx.
+  if (IsThisCall)
+    ++I;
+
+  // Put arguments passed in memory into the struct.
+  for (; I != E; ++I) {
+    if (isArgInAlloca(I->info))
+      addFieldToArgStruct(FrameFields, StackOffset, I->info, I->type);
+  }
+
+  FI.setArgStruct(llvm::StructType::get(getVMContext(), FrameFields,
+                                        /*isPacked=*/true),
+                  StackAlign);
+}
+
+Address X86_32ABIInfo::EmitVAArg(CodeGenFunction &CGF, Address VAListAddr,
+                                 QualType Ty) const {
+
+  auto TypeInfo = getContext().getTypeInfoInChars(Ty);
+
+  // x86-32 changes the alignment of certain arguments on the stack.
+  //
+  // Just messing with TypeInfo like this works because we never pass
+  // anything indirectly.
+  TypeInfo.Align = CharUnits::fromQuantity(
+      getTypeStackAlignInBytes(Ty, TypeInfo.Align.getQuantity()));
+
+  return emitVoidPtrVAArg(CGF, VAListAddr, Ty, /*Indirect*/ false, TypeInfo,
+                          CharUnits::fromQuantity(4),
+                          /*AllowHigherAlign*/ true);
+}
+
+X86_32TargetCodeGenInfo::X86_32TargetCodeGenInfo(
+    CodeGenTypes &CGT, bool DarwinVectorABI, bool RetSmallStructInRegABI,
+    bool Win32StructABI, unsigned int NumRegisterParameters, bool SoftFloatABI)
+    : TargetCodeGenInfo(std::make_unique<X86_32ABIInfo>(
+          CGT, DarwinVectorABI, RetSmallStructInRegABI, Win32StructABI,
+          NumRegisterParameters, SoftFloatABI)) {
+  SwiftInfo = std::make_unique<X86_32SwiftABIInfo>(CGT);
+}
+
+bool X86_32TargetCodeGenInfo::isStructReturnInRegABI(
+    const llvm::Triple &Triple, const CodeGenOptions &Opts) {
+  assert(Triple.getArch() == llvm::Triple::x86);
+
+  switch (Opts.getStructReturnConvention()) {
+  case CodeGenOptions::SRCK_Default:
+    break;
+  case CodeGenOptions::SRCK_OnStack: // -fpcc-struct-return
+    return false;
+  case CodeGenOptions::SRCK_InRegs: // -freg-struct-return
+    return true;
+  }
+
+  if (Triple.isOSDarwin() || Triple.isOSIAMCU())
+    return true;
+
+  switch (Triple.getOS()) {
+  case llvm::Triple::DragonFly:
+  case llvm::Triple::FreeBSD:
+  case llvm::Triple::OpenBSD:
+  case llvm::Triple::Win32:
+    return true;
+  default:
+    return false;
+  }
+}
+
+static void addX86InterruptAttrs(const FunctionDecl *FD, llvm::GlobalValue *GV,
+                                 CodeGen::CodeGenModule &CGM) {
+  if (!FD->hasAttr<AnyX86InterruptAttr>())
+    return;
+
+  llvm::Function *Fn = cast<llvm::Function>(GV);
+  Fn->setCallingConv(llvm::CallingConv::X86_INTR);
+  if (FD->getNumParams() == 0)
+    return;
+
+  auto PtrTy = cast<PointerType>(FD->getParamDecl(0)->getType());
+  llvm::Type *ByValTy = CGM.getTypes().ConvertType(PtrTy->getPointeeType());
+  llvm::Attribute NewAttr =
+      llvm::Attribute::getWithByValType(Fn->getContext(), ByValTy);
+  Fn->addParamAttr(0, NewAttr);
+}
+
+void X86_32TargetCodeGenInfo::setTargetAttributes(
+    const Decl *D, llvm::GlobalValue *GV, CodeGen::CodeGenModule &CGM) const {
+  if (GV->isDeclaration())
+    return;
+  if (const FunctionDecl *FD = dyn_cast_or_null<FunctionDecl>(D)) {
+    if (FD->hasAttr<X86ForceAlignArgPointerAttr>()) {
+      llvm::Function *Fn = cast<llvm::Function>(GV);
+      Fn->addFnAttr("stackrealign");
+    }
+
+    addX86InterruptAttrs(FD, GV, CGM);
+  }
+}
+
+bool X86_32TargetCodeGenInfo::initDwarfEHRegSizeTable(
+    CodeGen::CodeGenFunction &CGF, llvm::Value *Address) const {
+  CodeGen::CGBuilderTy &Builder = CGF.Builder;
+
+  llvm::Value *Four8 = llvm::ConstantInt::get(CGF.Int8Ty, 4);
+
+  // 0-7 are the eight integer registers;  the order is different
+  //   on Darwin (for EH), but the range is the same.
+  // 8 is %eip.
+  AssignToArrayRange(Builder, Address, Four8, 0, 8);
+
+  if (CGF.CGM.getTarget().getTriple().isOSDarwin()) {
+    // 12-16 are st(0..4).  Not sure why we stop at 4.
+    // These have size 16, which is sizeof(long double) on
+    // platforms with 8-byte alignment for that type.
+    llvm::Value *Sixteen8 = llvm::ConstantInt::get(CGF.Int8Ty, 16);
+    AssignToArrayRange(Builder, Address, Sixteen8, 12, 16);
+
+  } else {
+    // 9 is %eflags, which doesn't get a size on Darwin for some
+    // reason.
+    Builder.CreateAlignedStore(
+        Four8, Builder.CreateConstInBoundsGEP1_32(CGF.Int8Ty, Address, 9),
+        CharUnits::One());
+
+    // 11-16 are st(0..5).  Not sure why we stop at 5.
+    // These have size 12, which is sizeof(long double) on
+    // platforms with 4-byte alignment for that type.
+    llvm::Value *Twelve8 = llvm::ConstantInt::get(CGF.Int8Ty, 12);
+    AssignToArrayRange(Builder, Address, Twelve8, 11, 16);
+  }
+
+  return false;
+}
+
+llvm::Type *X86_32TargetCodeGenInfo::adjustInlineAsmType(CodeGenFunction &CGF,
+                                                         StringRef Constraint,
+                                                         llvm::Type *Ty) const {
+  return X86AdjustInlineAsmType(CGF, Constraint, Ty);
+}
+
+//===----------------------------------------------------------------------===//
+// X86-64 ABI Implementation
+//===----------------------------------------------------------------------===//
+
+/// \p returns the size in bits of the largest (native) vector for \p AVXLevel.
+static unsigned getNativeVectorSizeForAVXABI(X86AVXABILevel AVXLevel) {
+  switch (AVXLevel) {
+  case X86AVXABILevel::AVX512:
+    return 512;
+  case X86AVXABILevel::AVX:
+    return 256;
+  case X86AVXABILevel::None:
+    return 128;
+  }
+  llvm_unreachable("Unknown AVXLevel");
+}
+
+namespace {
+/// X86_64ABIInfo - The X86_64 ABI information.
+class X86_64ABIInfo : public ABIInfo {
+  enum Class {
+    Integer = 0,
+    SSE,
+    SSEUp,
+    X87,
+    X87Up,
+    ComplexX87,
+    NoClass,
+    Memory
+  };
+
+  /// merge - Implement the X86_64 ABI merging algorithm.
+  ///
+  /// Merge an accumulating classification \arg Accum with a field
+  /// classification \arg Field.
+  ///
+  /// \param Accum - The accumulating classification. This should
+  /// always be either NoClass or the result of a previous merge
+  /// call. In addition, this should never be Memory (the caller
+  /// should just return Memory for the aggregate).
+  static Class merge(Class Accum, Class Field);
+
+  /// postMerge - Implement the X86_64 ABI post merging algorithm.
+  ///
+  /// Post merger cleanup, reduces a malformed Hi and Lo pair to
+  /// final MEMORY or SSE classes when necessary.
+  ///
+  /// \param AggregateSize - The size of the current aggregate in
+  /// the classification process.
+  ///
+  /// \param Lo - The classification for the parts of the type
+  /// residing in the low word of the containing object.
+  ///
+  /// \param Hi - The classification for the parts of the type
+  /// residing in the higher words of the containing object.
+  ///
+  void postMerge(unsigned AggregateSize, Class &Lo, Class &Hi) const;
+
+  /// classify - Determine the x86_64 register classes in which the
+  /// given type T should be passed.
+  ///
+  /// \param Lo - The classification for the parts of the type
+  /// residing in the low word of the containing object.
+  ///
+  /// \param Hi - The classification for the parts of the type
+  /// residing in the high word of the containing object.
+  ///
+  /// \param OffsetBase - The bit offset of this type in the
+  /// containing object.  Some parameters are classified different
+  /// depending on whether they straddle an eightbyte boundary.
+  ///
+  /// \param isNamedArg - Whether the argument in question is a "named"
+  /// argument, as used in AMD64-ABI 3.5.7.
+  ///
+  /// \param IsRegCall - Whether the calling conversion is regcall.
+  ///
+  /// If a word is unused its result will be NoClass; if a type should
+  /// be passed in Memory then at least the classification of \arg Lo
+  /// will be Memory.
+  ///
+  /// The \arg Lo class will be NoClass iff the argument is ignored.
+  ///
+  /// If the \arg Lo class is ComplexX87, then the \arg Hi class will
+  /// also be ComplexX87.
+  void classify(QualType T, uint64_t OffsetBase, Class &Lo, Class &Hi,
+                bool isNamedArg, bool IsRegCall = false) const;
+
+  llvm::Type *GetByteVectorType(QualType Ty) const;
+  llvm::Type *GetSSETypeAtOffset(llvm::Type *IRType, unsigned IROffset,
+                                 QualType SourceTy,
+                                 unsigned SourceOffset) const;
+  llvm::Type *GetINTEGERTypeAtOffset(llvm::Type *IRType, unsigned IROffset,
+                                     QualType SourceTy,
+                                     unsigned SourceOffset) const;
+
+  /// getIndirectResult - Give a source type \arg Ty, return a suitable result
+  /// such that the argument will be returned in memory.
+  ABIArgInfo getIndirectReturnResult(QualType Ty) const;
+
+  /// getIndirectResult - Give a source type \arg Ty, return a suitable result
+  /// such that the argument will be passed in memory.
+  ///
+  /// \param freeIntRegs - The number of free integer registers remaining
+  /// available.
+  ABIArgInfo getIndirectResult(QualType Ty, unsigned freeIntRegs) const;
+
+  ABIArgInfo classifyReturnType(QualType RetTy) const;
+
+  ABIArgInfo classifyArgumentType(QualType Ty, unsigned freeIntRegs,
+                                  unsigned &neededInt, unsigned &neededSSE,
+                                  bool isNamedArg,
+                                  bool IsRegCall = false) const;
+
+  ABIArgInfo classifyRegCallStructType(QualType Ty, unsigned &NeededInt,
+                                       unsigned &NeededSSE,
+                                       unsigned &MaxVectorWidth) const;
+
+  ABIArgInfo classifyRegCallStructTypeImpl(QualType Ty, unsigned &NeededInt,
+                                           unsigned &NeededSSE,
+                                           unsigned &MaxVectorWidth) const;
+
+  bool IsIllegalVectorType(QualType Ty) const;
+
+  /// The 0.98 ABI revision clarified a lot of ambiguities,
+  /// unfortunately in ways that were not always consistent with
+  /// certain previous compilers.  In particular, platforms which
+  /// required strict binary compatibility with older versions of GCC
+  /// may need to exempt themselves.
+  bool honorsRevision0_98() const {
+    return !getTarget().getTriple().isOSDarwin();
+  }
+
+  /// GCC classifies <1 x long long> as SSE but some platform ABIs choose to
+  /// classify it as INTEGER (for compatibility with older clang compilers).
+  bool classifyIntegerMMXAsSSE() const {
+    // Clang <= 3.8 did not do this.
+    if (getContext().getLangOpts().getClangABICompat() <=
+        LangOptions::ClangABI::Ver3_8)
+      return false;
+
+    const llvm::Triple &Triple = getTarget().getTriple();
+    if (Triple.isOSDarwin() || Triple.isPS() || Triple.isOSFreeBSD())
+      return false;
+    return true;
+  }
+
+  // GCC classifies vectors of __int128 as memory.
+  bool passInt128VectorsInMem() const {
+    // Clang <= 9.0 did not do this.
+    if (getContext().getLangOpts().getClangABICompat() <=
+        LangOptions::ClangABI::Ver9)
+      return false;
+
+    const llvm::Triple &T = getTarget().getTriple();
+    return T.isOSLinux() || T.isOSNetBSD();
+  }
+
+  X86AVXABILevel AVXLevel;
+  // Some ABIs (e.g. X32 ABI and Native Client OS) use 32 bit pointers on
+  // 64-bit hardware.
+  bool Has64BitPointers;
+
+public:
+  X86_64ABIInfo(CodeGen::CodeGenTypes &CGT, X86AVXABILevel AVXLevel)
+      : ABIInfo(CGT), AVXLevel(AVXLevel),
+        Has64BitPointers(CGT.getDataLayout().getPointerSize(0) == 8) {}
+
+  bool isPassedUsingAVXType(QualType type) const {
+    unsigned neededInt, neededSSE;
+    // The freeIntRegs argument doesn't matter here.
+    ABIArgInfo info = classifyArgumentType(type, 0, neededInt, neededSSE,
+                                           /*isNamedArg*/ true);
+    if (info.isDirect()) {
+      llvm::Type *ty = info.getCoerceToType();
+      if (llvm::VectorType *vectorTy = dyn_cast_or_null<llvm::VectorType>(ty))
+        return vectorTy->getPrimitiveSizeInBits().getFixedValue() > 128;
+    }
+    return false;
+  }
+
+  void computeInfo(CGFunctionInfo &FI) const override;
+
+  Address EmitVAArg(CodeGenFunction &CGF, Address VAListAddr,
+                    QualType Ty) const override;
+  Address EmitMSVAArg(CodeGenFunction &CGF, Address VAListAddr,
+                      QualType Ty) const override;
+
+  bool has64BitPointers() const { return Has64BitPointers; }
+};
+
+/// WinX86_64ABIInfo - The Windows X86_64 ABI information.
+class WinX86_64ABIInfo : public ABIInfo {
+public:
+  WinX86_64ABIInfo(CodeGen::CodeGenTypes &CGT, X86AVXABILevel AVXLevel)
+      : ABIInfo(CGT), AVXLevel(AVXLevel),
+        IsMingw64(getTarget().getTriple().isWindowsGNUEnvironment()) {}
+
+  void computeInfo(CGFunctionInfo &FI) const override;
+
+  Address EmitVAArg(CodeGenFunction &CGF, Address VAListAddr,
+                    QualType Ty) const override;
+
+  bool isHomogeneousAggregateBaseType(QualType Ty) const override {
+    // FIXME: Assumes vectorcall is in use.
+    return isX86VectorTypeForVectorCall(getContext(), Ty);
+  }
+
+  bool isHomogeneousAggregateSmallEnough(const Type *Ty,
+                                         uint64_t NumMembers) const override {
+    // FIXME: Assumes vectorcall is in use.
+    return isX86VectorCallAggregateSmallEnough(NumMembers);
+  }
+
+private:
+  ABIArgInfo classify(QualType Ty, unsigned &FreeSSERegs, bool IsReturnType,
+                      bool IsVectorCall, bool IsRegCall) const;
+  ABIArgInfo reclassifyHvaArgForVectorCall(QualType Ty, unsigned &FreeSSERegs,
+                                           const ABIArgInfo &current) const;
+
+  X86AVXABILevel AVXLevel;
+
+  bool IsMingw64;
+};
+
+} // namespace
+
+X86_64TargetCodeGenInfo::X86_64TargetCodeGenInfo(CodeGenTypes &CGT,
+                                                 X86AVXABILevel AVXLevel)
+    : TargetCodeGenInfo(std::make_unique<X86_64ABIInfo>(CGT, AVXLevel)) {
+  SwiftInfo =
+      std::make_unique<SwiftABIInfo>(CGT, /*SwiftErrorInRegister=*/true);
+}
+
+bool X86_64TargetCodeGenInfo::initDwarfEHRegSizeTable(
+    CodeGenFunction &CGF, llvm::Value *Address) const {
+  llvm::Value *Eight8 = llvm::ConstantInt::get(CGF.Int8Ty, 8);
+
+  // 0-15 are the 16 integer registers.
+  // 16 is %rip.
+  AssignToArrayRange(CGF.Builder, Address, Eight8, 0, 16);
+  return false;
+}
+
+llvm::Type *X86_64TargetCodeGenInfo::adjustInlineAsmType(CodeGenFunction &CGF,
+                                                         StringRef Constraint,
+                                                         llvm::Type *Ty) const {
+  return X86AdjustInlineAsmType(CGF, Constraint, Ty);
+}
+
+bool X86_64TargetCodeGenInfo::isNoProtoCallVariadic(
+    const CallArgList &args, const FunctionNoProtoType *fnType) const {
+  // The default CC on x86-64 sets %al to the number of SSA
+  // registers used, and GCC sets this when calling an unprototyped
+  // function, so we override the default behavior.  However, don't do
+  // that when AVX types are involved: the ABI explicitly states it is
+  // undefined, and it doesn't work in practice because of how the ABI
+  // defines varargs anyway.
+  if (fnType->getCallConv() == CC_C) {
+    bool HasAVXType = false;
+    for (CallArgList::const_iterator it = args.begin(), ie = args.end();
+         it != ie; ++it) {
+      if (static_cast<const X86_64ABIInfo &>(TargetCodeGenInfo::getABIInfo())
+              .isPassedUsingAVXType(it->Ty)) {
+        HasAVXType = true;
+        break;
+      }
+    }
+
+    if (!HasAVXType)
+      return true;
+  }
+
+  return TargetCodeGenInfo::isNoProtoCallVariadic(args, fnType);
+}
+
+void X86_64TargetCodeGenInfo::setTargetAttributes(const Decl *D,
+                                                  llvm::GlobalValue *GV,
+                                                  CodeGenModule &CGM) const {
+  if (GV->isDeclaration())
+    return;
+  if (const FunctionDecl *FD = dyn_cast_or_null<FunctionDecl>(D)) {
+    if (FD->hasAttr<X86ForceAlignArgPointerAttr>()) {
+      llvm::Function *Fn = cast<llvm::Function>(GV);
+      Fn->addFnAttr("stackrealign");
+    }
+
+    addX86InterruptAttrs(FD, GV, CGM);
+  }
+}
+
+static void initFeatureMaps(const ASTContext &Ctx,
+                            llvm::StringMap<bool> &CallerMap,
+                            const FunctionDecl *Caller,
+                            llvm::StringMap<bool> &CalleeMap,
+                            const FunctionDecl *Callee) {
+  if (CalleeMap.empty() && CallerMap.empty()) {
+    // The caller is potentially nullptr in the case where the call isn't in a
+    // function.  In this case, the getFunctionFeatureMap ensures we just get
+    // the TU level setting (since it cannot be modified by 'target'..
+    Ctx.getFunctionFeatureMap(CallerMap, Caller);
+    Ctx.getFunctionFeatureMap(CalleeMap, Callee);
+  }
+}
+
+static bool checkAVXParamFeature(DiagnosticsEngine &Diag,
+                                 SourceLocation CallLoc,
+                                 const llvm::StringMap<bool> &CallerMap,
+                                 const llvm::StringMap<bool> &CalleeMap,
+                                 QualType Ty, StringRef Feature,
+                                 bool IsArgument) {
+  bool CallerHasFeat = CallerMap.lookup(Feature);
+  bool CalleeHasFeat = CalleeMap.lookup(Feature);
+  if (!CallerHasFeat && !CalleeHasFeat)
+    return Diag.Report(CallLoc, diag::warn_avx_calling_convention)
+           << IsArgument << Ty << Feature;
+
+  // Mixing calling conventions here is very clearly an error.
+  if (!CallerHasFeat || !CalleeHasFeat)
+    return Diag.Report(CallLoc, diag::err_avx_calling_convention)
+           << IsArgument << Ty << Feature;
+
+  // Else, both caller and callee have the required feature, so there is no need
+  // to diagnose.
+  return false;
+}
+
+static bool checkAVXParam(DiagnosticsEngine &Diag, ASTContext &Ctx,
+                          SourceLocation CallLoc,
+                          const llvm::StringMap<bool> &CallerMap,
+                          const llvm::StringMap<bool> &CalleeMap, QualType Ty,
+                          bool IsArgument) {
+  uint64_t Size = Ctx.getTypeSize(Ty);
+  if (Size > 256)
+    return checkAVXParamFeature(Diag, CallLoc, CallerMap, CalleeMap, Ty,
+                                "avx512f", IsArgument);
+
+  if (Size > 128)
+    return checkAVXParamFeature(Diag, CallLoc, CallerMap, CalleeMap, Ty, "avx",
+                                IsArgument);
+
+  return false;
+}
+
+void X86_64TargetCodeGenInfo::checkFunctionCallABI(
+    CodeGenModule &CGM, SourceLocation CallLoc, const FunctionDecl *Caller,
+    const FunctionDecl *Callee, const CallArgList &Args) const {
+  llvm::StringMap<bool> CallerMap;
+  llvm::StringMap<bool> CalleeMap;
+  unsigned ArgIndex = 0;
+
+  // We need to loop through the actual call arguments rather than the
+  // function's parameters, in case this variadic.
+  for (const CallArg &Arg : Args) {
+    // The "avx" feature changes how vectors >128 in size are passed. "avx512f"
+    // additionally changes how vectors >256 in size are passed. Like GCC, we
+    // warn when a function is called with an argument where this will change.
+    // Unlike GCC, we also error when it is an obvious ABI mismatch, that is,
+    // the caller and callee features are mismatched.
+    // Unfortunately, we cannot do this diagnostic in SEMA, since the callee can
+    // change its ABI with attribute-target after this call.
+    if (Arg.getType()->isVectorType() &&
+        CGM.getContext().getTypeSize(Arg.getType()) > 128) {
+      initFeatureMaps(CGM.getContext(), CallerMap, Caller, CalleeMap, Callee);
+      QualType Ty = Arg.getType();
+      // The CallArg seems to have desugared the type already, so for clearer
+      // diagnostics, replace it with the type in the FunctionDecl if possible.
+      if (ArgIndex < Callee->getNumParams())
+        Ty = Callee->getParamDecl(ArgIndex)->getType();
+
+      if (checkAVXParam(CGM.getDiags(), CGM.getContext(), CallLoc, CallerMap,
+                        CalleeMap, Ty, /*IsArgument*/ true))
+        return;
+    }
+    ++ArgIndex;
+  }
+
+  // Check return always, as we don't have a good way of knowing in codegen
+  // whether this value is used, tail-called, etc.
+  if (Callee->getReturnType()->isVectorType() &&
+      CGM.getContext().getTypeSize(Callee->getReturnType()) > 128) {
+    initFeatureMaps(CGM.getContext(), CallerMap, Caller, CalleeMap, Callee);
+    checkAVXParam(CGM.getDiags(), CGM.getContext(), CallLoc, CallerMap,
+                  CalleeMap, Callee->getReturnType(),
+                  /*IsArgument*/ false);
+  }
+}
+
+void WinX86_32TargetCodeGenInfo::getDependentLibraryOption(
+    llvm::StringRef Lib, SmallString<24> &Opt) const {
+  Opt = "/DEFAULTLIB:";
+  Opt += qualifyWindowsLibrary(Lib);
+}
+
+void WinX86_32TargetCodeGenInfo::setTargetAttributes(
+    const Decl *D, llvm::GlobalValue *GV, CodeGen::CodeGenModule &CGM) const {
+  X86_32TargetCodeGenInfo::setTargetAttributes(D, GV, CGM);
+  if (GV->isDeclaration())
+    return;
+  addStackProbeTargetAttributes(D, GV, CGM);
+}
+
+WinX86_64TargetCodeGenInfo::WinX86_64TargetCodeGenInfo(CodeGenTypes &CGT,
+                                                       X86AVXABILevel AVXLevel)
+    : TargetCodeGenInfo(std::make_unique<WinX86_64ABIInfo>(CGT, AVXLevel)) {
+  SwiftInfo =
+      std::make_unique<SwiftABIInfo>(CGT, /*SwiftErrorInRegister=*/true);
+}
+
+bool WinX86_64TargetCodeGenInfo::initDwarfEHRegSizeTable(
+    CodeGenFunction &CGF, llvm::Value *Address) const {
+  llvm::Value *Eight8 = llvm::ConstantInt::get(CGF.Int8Ty, 8);
+
+  // 0-15 are the 16 integer registers.
+  // 16 is %rip.
+  AssignToArrayRange(CGF.Builder, Address, Eight8, 0, 16);
+  return false;
+}
+
+void WinX86_64TargetCodeGenInfo::getDependentLibraryOption(
+    llvm::StringRef Lib, SmallString<24> &Opt) const {
+  Opt = "/DEFAULTLIB:";
+  Opt += qualifyWindowsLibrary(Lib);
+}
+
+void WinX86_64TargetCodeGenInfo::setTargetAttributes(const Decl *D,
+                                                     llvm::GlobalValue *GV,
+                                                     CodeGenModule &CGM) const {
+  TargetCodeGenInfo::setTargetAttributes(D, GV, CGM);
+  if (GV->isDeclaration())
+    return;
+  if (const FunctionDecl *FD = dyn_cast_or_null<FunctionDecl>(D)) {
+    if (FD->hasAttr<X86ForceAlignArgPointerAttr>()) {
+      llvm::Function *Fn = cast<llvm::Function>(GV);
+      Fn->addFnAttr("stackrealign");
+    }
+
+    addX86InterruptAttrs(FD, GV, CGM);
+  }
+
+  addStackProbeTargetAttributes(D, GV, CGM);
+}
+
+void X86_64ABIInfo::postMerge(unsigned AggregateSize, Class &Lo,
+                              Class &Hi) const {
+  // AMD64-ABI 3.2.3p2: Rule 5. Then a post merger cleanup is done:
+  //
+  // (a) If one of the classes is Memory, the whole argument is passed in
+  //     memory.
+  //
+  // (b) If X87UP is not preceded by X87, the whole argument is passed in
+  //     memory.
+  //
+  // (c) If the size of the aggregate exceeds two eightbytes and the first
+  //     eightbyte isn't SSE or any other eightbyte isn't SSEUP, the whole
+  //     argument is passed in memory. NOTE: This is necessary to keep the
+  //     ABI working for processors that don't support the __m256 type.
+  //
+  // (d) If SSEUP is not preceded by SSE or SSEUP, it is converted to SSE.
+  //
+  // Some of these are enforced by the merging logic.  Others can arise
+  // only with unions; for example:
+  //   union { _Complex double; unsigned; }
+  //
+  // Note that clauses (b) and (c) were added in 0.98.
+  //
+  if (Hi == Memory)
+    Lo = Memory;
+  if (Hi == X87Up && Lo != X87 && honorsRevision0_98())
+    Lo = Memory;
+  if (AggregateSize > 128 && (Lo != SSE || Hi != SSEUp))
+    Lo = Memory;
+  if (Hi == SSEUp && Lo != SSE)
+    Hi = SSE;
+}
+
+X86_64ABIInfo::Class X86_64ABIInfo::merge(Class Accum, Class Field) {
+  // AMD64-ABI 3.2.3p2: Rule 4. Each field of an object is
+  // classified recursively so that always two fields are
+  // considered. The resulting class is calculated according to
+  // the classes of the fields in the eightbyte:
+  //
+  // (a) If both classes are equal, this is the resulting class.
+  //
+  // (b) If one of the classes is NO_CLASS, the resulting class is
+  // the other class.
+  //
+  // (c) If one of the classes is MEMORY, the result is the MEMORY
+  // class.
+  //
+  // (d) If one of the classes is INTEGER, the result is the
+  // INTEGER.
+  //
+  // (e) If one of the classes is X87, X87UP, COMPLEX_X87 class,
+  // MEMORY is used as class.
+  //
+  // (f) Otherwise class SSE is used.
+
+  // Accum should never be memory (we should have returned) or
+  // ComplexX87 (because this cannot be passed in a structure).
+  assert((Accum != Memory && Accum != ComplexX87) &&
+         "Invalid accumulated classification during merge.");
+  if (Accum == Field || Field == NoClass)
+    return Accum;
+  if (Field == Memory)
+    return Memory;
+  if (Accum == NoClass)
+    return Field;
+  if (Accum == Integer || Field == Integer)
+    return Integer;
+  if (Field == X87 || Field == X87Up || Field == ComplexX87 || Accum == X87 ||
+      Accum == X87Up)
+    return Memory;
+  return SSE;
+}
+
+void X86_64ABIInfo::classify(QualType Ty, uint64_t OffsetBase, Class &Lo,
+                             Class &Hi, bool isNamedArg, bool IsRegCall) const {
+  // FIXME: This code can be simplified by introducing a simple value class for
+  // Class pairs with appropriate constructor methods for the various
+  // situations.
+
+  // FIXME: Some of the split computations are wrong; unaligned vectors
+  // shouldn't be passed in registers for example, so there is no chance they
+  // can straddle an eightbyte. Verify & simplify.
+
+  Lo = Hi = NoClass;
+
+  Class &Current = OffsetBase < 64 ? Lo : Hi;
+  Current = Memory;
+
+  if (const BuiltinType *BT = Ty->getAs<BuiltinType>()) {
+    BuiltinType::Kind k = BT->getKind();
+
+    if (k == BuiltinType::Void) {
+      Current = NoClass;
+    } else if (k == BuiltinType::Int128 || k == BuiltinType::UInt128) {
+      Lo = Integer;
+      Hi = Integer;
+    } else if (k >= BuiltinType::Bool && k <= BuiltinType::LongLong) {
+      Current = Integer;
+    } else if (k == BuiltinType::Float || k == BuiltinType::Double ||
+               k == BuiltinType::Float16 || k == BuiltinType::BFloat16) {
+      Current = SSE;
+    } else if (k == BuiltinType::LongDouble) {
+      const llvm::fltSemantics *LDF = &getTarget().getLongDoubleFormat();
+      if (LDF == &llvm::APFloat::IEEEquad()) {
+        Lo = SSE;
+        Hi = SSEUp;
+      } else if (LDF == &llvm::APFloat::x87DoubleExtended()) {
+        Lo = X87;
+        Hi = X87Up;
+      } else if (LDF == &llvm::APFloat::IEEEdouble()) {
+        Current = SSE;
+      } else
+        llvm_unreachable("unexpected long double representation!");
+    }
+    // FIXME: _Decimal32 and _Decimal64 are SSE.
+    // FIXME: _float128 and _Decimal128 are (SSE, SSEUp).
+    return;
+  }
+
+  if (const EnumType *ET = Ty->getAs<EnumType>()) {
+    // Classify the underlying integer type.
+    classify(ET->getDecl()->getIntegerType(), OffsetBase, Lo, Hi, isNamedArg);
+    return;
+  }
+
+  if (Ty->hasPointerRepresentation()) {
+    Current = Integer;
+    return;
+  }
+
+  if (Ty->isMemberPointerType()) {
+    if (Ty->isMemberFunctionPointerType()) {
+      if (Has64BitPointers) {
+        // If Has64BitPointers, this is an {i64, i64}, so classify both
+        // Lo and Hi now.
+        Lo = Hi = Integer;
+      } else {
+        // Otherwise, with 32-bit pointers, this is an {i32, i32}. If that
+        // straddles an eightbyte boundary, Hi should be classified as well.
+        uint64_t EB_FuncPtr = (OffsetBase) / 64;
+        uint64_t EB_ThisAdj = (OffsetBase + 64 - 1) / 64;
+        if (EB_FuncPtr != EB_ThisAdj) {
+          Lo = Hi = Integer;
+        } else {
+          Current = Integer;
+        }
+      }
+    } else {
+      Current = Integer;
+    }
+    return;
+  }
+
+  if (const VectorType *VT = Ty->getAs<VectorType>()) {
+    uint64_t Size = getContext().getTypeSize(VT);
+    if (Size == 1 || Size == 8 || Size == 16 || Size == 32) {
+      // gcc passes the following as integer:
+      // 4 bytes - <4 x char>, <2 x short>, <1 x int>, <1 x float>
+      // 2 bytes - <2 x char>, <1 x short>
+      // 1 byte  - <1 x char>
+      Current = Integer;
+
+      // If this type crosses an eightbyte boundary, it should be
+      // split.
+      uint64_t EB_Lo = (OffsetBase) / 64;
+      uint64_t EB_Hi = (OffsetBase + Size - 1) / 64;
+      if (EB_Lo != EB_Hi)
+        Hi = Lo;
+    } else if (Size == 64) {
+      QualType ElementType = VT->getElementType();
+
+      // gcc passes <1 x double> in memory. :(
+      if (ElementType->isSpecificBuiltinType(BuiltinType::Double))
+        return;
+
+      // gcc passes <1 x long long> as SSE but clang used to unconditionally
+      // pass them as integer.  For platforms where clang is the de facto
+      // platform compiler, we must continue to use integer.
+      if (!classifyIntegerMMXAsSSE() &&
+          (ElementType->isSpecificBuiltinType(BuiltinType::LongLong) ||
+           ElementType->isSpecificBuiltinType(BuiltinType::ULongLong) ||
+           ElementType->isSpecificBuiltinType(BuiltinType::Long) ||
+           ElementType->isSpecificBuiltinType(BuiltinType::ULong)))
+        Current = Integer;
+      else
+        Current = SSE;
+
+      // If this type crosses an eightbyte boundary, it should be
+      // split.
+      if (OffsetBase && OffsetBase != 64)
+        Hi = Lo;
+    } else if (Size == 128 ||
+               (isNamedArg && Size <= getNativeVectorSizeForAVXABI(AVXLevel))) {
+      QualType ElementType = VT->getElementType();
+
+      // gcc passes 256 and 512 bit <X x __int128> vectors in memory. :(
+      if (passInt128VectorsInMem() && Size != 128 &&
+          (ElementType->isSpecificBuiltinType(BuiltinType::Int128) ||
+           ElementType->isSpecificBuiltinType(BuiltinType::UInt128)))
+        return;
+
+      // Arguments of 256-bits are split into four eightbyte chunks. The
+      // least significant one belongs to class SSE and all the others to class
+      // SSEUP. The original Lo and Hi design considers that types can't be
+      // greater than 128-bits, so a 64-bit split in Hi and Lo makes sense.
+      // This design isn't correct for 256-bits, but since there're no cases
+      // where the upper parts would need to be inspected, avoid adding
+      // complexity and just consider Hi to match the 64-256 part.
+      //
+      // Note that per 3.5.7 of AMD64-ABI, 256-bit args are only passed in
+      // registers if they are "named", i.e. not part of the "..." of a
+      // variadic function.
+      //
+      // Similarly, per 3.2.3. of the AVX512 draft, 512-bits ("named") args are
+      // split into eight eightbyte chunks, one SSE and seven SSEUP.
+      Lo = SSE;
+      Hi = SSEUp;
+    }
+    return;
+  }
+
+  if (const ComplexType *CT = Ty->getAs<ComplexType>()) {
+    QualType ET = getContext().getCanonicalType(CT->getElementType());
+
+    uint64_t Size = getContext().getTypeSize(Ty);
+    if (ET->isIntegralOrEnumerationType()) {
+      if (Size <= 64)
+        Current = Integer;
+      else if (Size <= 128)
+        Lo = Hi = Integer;
+    } else if (ET->isFloat16Type() || ET == getContext().FloatTy ||
+               ET->isBFloat16Type()) {
+      Current = SSE;
+    } else if (ET == getContext().DoubleTy) {
+      Lo = Hi = SSE;
+    } else if (ET == getContext().LongDoubleTy) {
+      const llvm::fltSemantics *LDF = &getTarget().getLongDoubleFormat();
+      if (LDF == &llvm::APFloat::IEEEquad())
+        Current = Memory;
+      else if (LDF == &llvm::APFloat::x87DoubleExtended())
+        Current = ComplexX87;
+      else if (LDF == &llvm::APFloat::IEEEdouble())
+        Lo = Hi = SSE;
+      else
+        llvm_unreachable("unexpected long double representation!");
+    }
+
+    // If this complex type crosses an eightbyte boundary then it
+    // should be split.
+    uint64_t EB_Real = (OffsetBase) / 64;
+    uint64_t EB_Imag = (OffsetBase + getContext().getTypeSize(ET)) / 64;
+    if (Hi == NoClass && EB_Real != EB_Imag)
+      Hi = Lo;
+
+    return;
+  }
+
+  if (const auto *EITy = Ty->getAs<BitIntType>()) {
+    if (EITy->getNumBits() <= 64)
+      Current = Integer;
+    else if (EITy->getNumBits() <= 128)
+      Lo = Hi = Integer;
+    // Larger values need to get passed in memory.
+    return;
+  }
+
+  if (const ConstantArrayType *AT = getContext().getAsConstantArrayType(Ty)) {
+    // Arrays are treated like structures.
+
+    uint64_t Size = getContext().getTypeSize(Ty);
+
+    // AMD64-ABI 3.2.3p2: Rule 1. If the size of an object is larger
+    // than eight eightbytes, ..., it has class MEMORY.
+    // regcall ABI doesn't have limitation to an object. The only limitation
+    // is the free registers, which will be checked in computeInfo.
+    if (!IsRegCall && Size > 512)
+      return;
+
+    // AMD64-ABI 3.2.3p2: Rule 1. If ..., or it contains unaligned
+    // fields, it has class MEMORY.
+    //
+    // Only need to check alignment of array base.
+    if (OffsetBase % getContext().getTypeAlign(AT->getElementType()))
+      return;
+
+    // Otherwise implement simplified merge. We could be smarter about
+    // this, but it isn't worth it and would be harder to verify.
+    Current = NoClass;
+    uint64_t EltSize = getContext().getTypeSize(AT->getElementType());
+    uint64_t ArraySize = AT->getSize().getZExtValue();
+
+    // The only case a 256-bit wide vector could be used is when the array
+    // contains a single 256-bit element. Since Lo and Hi logic isn't extended
+    // to work for sizes wider than 128, early check and fallback to memory.
+    //
+    if (Size > 128 &&
+        (Size != EltSize || Size > getNativeVectorSizeForAVXABI(AVXLevel)))
+      return;
+
+    for (uint64_t i = 0, Offset = OffsetBase; i < ArraySize;
+         ++i, Offset += EltSize) {
+      Class FieldLo, FieldHi;
+      classify(AT->getElementType(), Offset, FieldLo, FieldHi, isNamedArg);
+      Lo = merge(Lo, FieldLo);
+      Hi = merge(Hi, FieldHi);
+      if (Lo == Memory || Hi == Memory)
+        break;
+    }
+
+    postMerge(Size, Lo, Hi);
+    assert((Hi != SSEUp || Lo == SSE) && "Invalid SSEUp array classification.");
+    return;
+  }
+
+  if (const RecordType *RT = Ty->getAs<RecordType>()) {
+    uint64_t Size = getContext().getTypeSize(Ty);
+
+    // AMD64-ABI 3.2.3p2: Rule 1. If the size of an object is larger
+    // than eight eightbytes, ..., it has class MEMORY.
+    if (Size > 512)
+      return;
+
+    // AMD64-ABI 3.2.3p2: Rule 2. If a C++ object has either a non-trivial
+    // copy constructor or a non-trivial destructor, it is passed by invisible
+    // reference.
+    if (getRecordArgABI(RT, getCXXABI()))
+      return;
+
+    const RecordDecl *RD = RT->getDecl();
+
+    // Assume variable sized types are passed in memory.
+    if (RD->hasFlexibleArrayMember())
+      return;
+
+    const ASTRecordLayout &Layout = getContext().getASTRecordLayout(RD);
+
+    // Reset Lo class, this will be recomputed.
+    Current = NoClass;
+
+    // If this is a C++ record, classify the bases first.
+    if (const CXXRecordDecl *CXXRD = dyn_cast<CXXRecordDecl>(RD)) {
+      for (const auto &I : CXXRD->bases()) {
+        assert(!I.isVirtual() && !I.getType()->isDependentType() &&
+               "Unexpected base class!");
+        const auto *Base =
+            cast<CXXRecordDecl>(I.getType()->castAs<RecordType>()->getDecl());
+
+        // Classify this field.
+        //
+        // AMD64-ABI 3.2.3p2: Rule 3. If the size of the aggregate exceeds a
+        // single eightbyte, each is classified separately. Each eightbyte gets
+        // initialized to class NO_CLASS.
+        Class FieldLo, FieldHi;
+        uint64_t Offset =
+            OffsetBase + getContext().toBits(Layout.getBaseClassOffset(Base));
+        classify(I.getType(), Offset, FieldLo, FieldHi, isNamedArg);
+        Lo = merge(Lo, FieldLo);
+        Hi = merge(Hi, FieldHi);
+        if (Lo == Memory || Hi == Memory) {
+          postMerge(Size, Lo, Hi);
+          return;
+        }
+      }
+    }
+
+    // Classify the fields one at a time, merging the results.
+    unsigned idx = 0;
+    bool UseClang11Compat = getContext().getLangOpts().getClangABICompat() <=
+                                LangOptions::ClangABI::Ver11 ||
+                            getContext().getTargetInfo().getTriple().isPS();
+    bool IsUnion = RT->isUnionType() && !UseClang11Compat;
+
+    for (RecordDecl::field_iterator i = RD->field_begin(), e = RD->field_end();
+         i != e; ++i, ++idx) {
+      uint64_t Offset = OffsetBase + Layout.getFieldOffset(idx);
+      bool BitField = i->isBitField();
+
+      // Ignore padding bit-fields.
+      if (BitField && i->isUnnamedBitfield())
+        continue;
+
+      // AMD64-ABI 3.2.3p2: Rule 1. If the size of an object is larger than
+      // eight eightbytes, or it contains unaligned fields, it has class MEMORY.
+      //
+      // The only case a 256-bit or a 512-bit wide vector could be used is when
+      // the struct contains a single 256-bit or 512-bit element. Early check
+      // and fallback to memory.
+      //
+      // FIXME: Extended the Lo and Hi logic properly to work for size wider
+      // than 128.
+      if (Size > 128 &&
+          ((!IsUnion && Size != getContext().getTypeSize(i->getType())) ||
+           Size > getNativeVectorSizeForAVXABI(AVXLevel))) {
+        Lo = Memory;
+        postMerge(Size, Lo, Hi);
+        return;
+      }
+      // Note, skip this test for bit-fields, see below.
+      if (!BitField && Offset % getContext().getTypeAlign(i->getType())) {
+        Lo = Memory;
+        postMerge(Size, Lo, Hi);
+        return;
+      }
+
+      // Classify this field.
+      //
+      // AMD64-ABI 3.2.3p2: Rule 3. If the size of the aggregate
+      // exceeds a single eightbyte, each is classified
+      // separately. Each eightbyte gets initialized to class
+      // NO_CLASS.
+      Class FieldLo, FieldHi;
+
+      // Bit-fields require special handling, they do not force the
+      // structure to be passed in memory even if unaligned, and
+      // therefore they can straddle an eightbyte.
+      if (BitField) {
+        assert(!i->isUnnamedBitfield());
+        uint64_t Offset = OffsetBase + Layout.getFieldOffset(idx);
+        uint64_t Size = i->getBitWidthValue(getContext());
+
+        uint64_t EB_Lo = Offset / 64;
+        uint64_t EB_Hi = (Offset + Size - 1) / 64;
+
+        if (EB_Lo) {
+          assert(EB_Hi == EB_Lo && "Invalid classification, type > 16 bytes.");
+          FieldLo = NoClass;
+          FieldHi = Integer;
+        } else {
+          FieldLo = Integer;
+          FieldHi = EB_Hi ? Integer : NoClass;
+        }
+      } else
+        classify(i->getType(), Offset, FieldLo, FieldHi, isNamedArg);
+      Lo = merge(Lo, FieldLo);
+      Hi = merge(Hi, FieldHi);
+      if (Lo == Memory || Hi == Memory)
+        break;
+    }
+
+    postMerge(Size, Lo, Hi);
+  }
+}
+
+ABIArgInfo X86_64ABIInfo::getIndirectReturnResult(QualType Ty) const {
+  // If this is a scalar LLVM value then assume LLVM will pass it in the right
+  // place naturally.
+  if (!isAggregateTypeForABI(Ty)) {
+    // Treat an enum type as its underlying type.
+    if (const EnumType *EnumTy = Ty->getAs<EnumType>())
+      Ty = EnumTy->getDecl()->getIntegerType();
+
+    if (Ty->isBitIntType())
+      return getNaturalAlignIndirect(Ty);
+
+    return (isPromotableIntegerTypeForABI(Ty) ? ABIArgInfo::getExtend(Ty)
+                                              : ABIArgInfo::getDirect());
+  }
+
+  return getNaturalAlignIndirect(Ty);
+}
+
+bool X86_64ABIInfo::IsIllegalVectorType(QualType Ty) const {
+  if (const VectorType *VecTy = Ty->getAs<VectorType>()) {
+    uint64_t Size = getContext().getTypeSize(VecTy);
+    unsigned LargestVector = getNativeVectorSizeForAVXABI(AVXLevel);
+    if (Size <= 64 || Size > LargestVector)
+      return true;
+    QualType EltTy = VecTy->getElementType();
+    if (passInt128VectorsInMem() &&
+        (EltTy->isSpecificBuiltinType(BuiltinType::Int128) ||
+         EltTy->isSpecificBuiltinType(BuiltinType::UInt128)))
+      return true;
+  }
+
+  return false;
+}
+
+ABIArgInfo X86_64ABIInfo::getIndirectResult(QualType Ty,
+                                            unsigned freeIntRegs) const {
+  // If this is a scalar LLVM value then assume LLVM will pass it in the right
+  // place naturally.
+  //
+  // This assumption is optimistic, as there could be free registers available
+  // when we need to pass this argument in memory, and LLVM could try to pass
+  // the argument in the free register. This does not seem to happen currently,
+  // but this code would be much safer if we could mark the argument with
+  // 'onstack'. See PR12193.
+  if (!isAggregateTypeForABI(Ty) && !IsIllegalVectorType(Ty) &&
+      !Ty->isBitIntType()) {
+    // Treat an enum type as its underlying type.
+    if (const EnumType *EnumTy = Ty->getAs<EnumType>())
+      Ty = EnumTy->getDecl()->getIntegerType();
+
+    return (isPromotableIntegerTypeForABI(Ty) ? ABIArgInfo::getExtend(Ty)
+                                              : ABIArgInfo::getDirect());
+  }
+
+  if (CGCXXABI::RecordArgABI RAA = getRecordArgABI(Ty, getCXXABI()))
+    return getNaturalAlignIndirect(Ty, RAA == CGCXXABI::RAA_DirectInMemory);
+
+  // Compute the byval alignment. We specify the alignment of the byval in all
+  // cases so that the mid-level optimizer knows the alignment of the byval.
+  unsigned Align = std::max(getContext().getTypeAlign(Ty) / 8, 8U);
+
+  // Attempt to avoid passing indirect results using byval when possible. This
+  // is important for good codegen.
+  //
+  // We do this by coercing the value into a scalar type which the backend can
+  // handle naturally (i.e., without using byval).
+  //
+  // For simplicity, we currently only do this when we have exhausted all of the
+  // free integer registers. Doing this when there are free integer registers
+  // would require more care, as we would have to ensure that the coerced value
+  // did not claim the unused register. That would require either reording the
+  // arguments to the function (so that any subsequent inreg values came first),
+  // or only doing this optimization when there were no following arguments that
+  // might be inreg.
+  //
+  // We currently expect it to be rare (particularly in well written code) for
+  // arguments to be passed on the stack when there are still free integer
+  // registers available (this would typically imply large structs being passed
+  // by value), so this seems like a fair tradeoff for now.
+  //
+  // We can revisit this if the backend grows support for 'onstack' parameter
+  // attributes. See PR12193.
+  if (freeIntRegs == 0) {
+    uint64_t Size = getContext().getTypeSize(Ty);
+
+    // If this type fits in an eightbyte, coerce it into the matching integral
+    // type, which will end up on the stack (with alignment 8).
+    if (Align == 8 && Size <= 64)
+      return ABIArgInfo::getDirect(
+          llvm::IntegerType::get(getVMContext(), Size));
+  }
+
+  return ABIArgInfo::getIndirect(CharUnits::fromQuantity(Align));
+}
+
+/// The ABI specifies that a value should be passed in a full vector XMM/YMM
+/// register. Pick an LLVM IR type that will be passed as a vector register.
+llvm::Type *X86_64ABIInfo::GetByteVectorType(QualType Ty) const {
+  // Wrapper structs/arrays that only contain vectors are passed just like
+  // vectors; strip them off if present.
+  if (const Type *InnerTy = isSingleElementStruct(Ty, getContext()))
+    Ty = QualType(InnerTy, 0);
+
+  llvm::Type *IRType = CGT.ConvertType(Ty);
+  if (isa<llvm::VectorType>(IRType)) {
+    // Don't pass vXi128 vectors in their native type, the backend can't
+    // legalize them.
+    if (passInt128VectorsInMem() &&
+        cast<llvm::VectorType>(IRType)->getElementType()->isIntegerTy(128)) {
+      // Use a vXi64 vector.
+      uint64_t Size = getContext().getTypeSize(Ty);
+      return llvm::FixedVectorType::get(llvm::Type::getInt64Ty(getVMContext()),
+                                        Size / 64);
+    }
+
+    return IRType;
+  }
+
+  if (IRType->getTypeID() == llvm::Type::FP128TyID)
+    return IRType;
+
+  // We couldn't find the preferred IR vector type for 'Ty'.
+  uint64_t Size = getContext().getTypeSize(Ty);
+  assert((Size == 128 || Size == 256 || Size == 512) && "Invalid type found!");
+
+  // Return a LLVM IR vector type based on the size of 'Ty'.
+  return llvm::FixedVectorType::get(llvm::Type::getDoubleTy(getVMContext()),
+                                    Size / 64);
+}
+
+/// BitsContainNoUserData - Return true if the specified [start,end) bit range
+/// is known to either be off the end of the specified type or being in
+/// alignment padding.  The user type specified is known to be at most 128 bits
+/// in size, and have passed through X86_64ABIInfo::classify with a successful
+/// classification that put one of the two halves in the INTEGER class.
+///
+/// It is conservatively correct to return false.
+static bool BitsContainNoUserData(QualType Ty, unsigned StartBit,
+                                  unsigned EndBit, ASTContext &Context) {
+  // If the bytes being queried are off the end of the type, there is no user
+  // data hiding here.  This handles analysis of builtins, vectors and other
+  // types that don't contain interesting padding.
+  unsigned TySize = (unsigned)Context.getTypeSize(Ty);
+  if (TySize <= StartBit)
+    return true;
+
+  if (const ConstantArrayType *AT = Context.getAsConstantArrayType(Ty)) {
+    unsigned EltSize = (unsigned)Context.getTypeSize(AT->getElementType());
+    unsigned NumElts = (unsigned)AT->getSize().getZExtValue();
+
+    // Check each element to see if the element overlaps with the queried range.
+    for (unsigned i = 0; i != NumElts; ++i) {
+      // If the element is after the span we care about, then we're done..
+      unsigned EltOffset = i * EltSize;
+      if (EltOffset >= EndBit)
+        break;
+
+      unsigned EltStart = EltOffset < StartBit ? StartBit - EltOffset : 0;
+      if (!BitsContainNoUserData(AT->getElementType(), EltStart,
+                                 EndBit - EltOffset, Context))
+        return false;
+    }
+    // If it overlaps no elements, then it is safe to process as padding.
+    return true;
+  }
+
+  if (const RecordType *RT = Ty->getAs<RecordType>()) {
+    const RecordDecl *RD = RT->getDecl();
+    const ASTRecordLayout &Layout = Context.getASTRecordLayout(RD);
+
+    // If this is a C++ record, check the bases first.
+    if (const CXXRecordDecl *CXXRD = dyn_cast<CXXRecordDecl>(RD)) {
+      for (const auto &I : CXXRD->bases()) {
+        assert(!I.isVirtual() && !I.getType()->isDependentType() &&
+               "Unexpected base class!");
+        const auto *Base =
+            cast<CXXRecordDecl>(I.getType()->castAs<RecordType>()->getDecl());
+
+        // If the base is after the span we care about, ignore it.
+        unsigned BaseOffset = Context.toBits(Layout.getBaseClassOffset(Base));
+        if (BaseOffset >= EndBit)
+          continue;
+
+        unsigned BaseStart = BaseOffset < StartBit ? StartBit - BaseOffset : 0;
+        if (!BitsContainNoUserData(I.getType(), BaseStart, EndBit - BaseOffset,
+                                   Context))
+          return false;
+      }
+    }
+
+    // Verify that no field has data that overlaps the region of interest.  Yes
+    // this could be sped up a lot by being smarter about queried fields,
+    // however we're only looking at structs up to 16 bytes, so we don't care
+    // much.
+    unsigned idx = 0;
+    for (RecordDecl::field_iterator i = RD->field_begin(), e = RD->field_end();
+         i != e; ++i, ++idx) {
+      unsigned FieldOffset = (unsigned)Layout.getFieldOffset(idx);
+
+      // If we found a field after the region we care about, then we're done.
+      if (FieldOffset >= EndBit)
+        break;
+
+      unsigned FieldStart = FieldOffset < StartBit ? StartBit - FieldOffset : 0;
+      if (!BitsContainNoUserData(i->getType(), FieldStart, EndBit - FieldOffset,
+                                 Context))
+        return false;
+    }
+
+    // If nothing in this record overlapped the area of interest, then we're
+    // clean.
+    return true;
+  }
+
+  return false;
+}
+
+/// getFPTypeAtOffset - Return a floating point type at the specified offset.
+static llvm::Type *getFPTypeAtOffset(llvm::Type *IRType, unsigned IROffset,
+                                     const llvm::DataLayout &TD) {
+  if (IROffset == 0 && IRType->isFloatingPointTy())
+    return IRType;
+
+  // If this is a struct, recurse into the field at the specified offset.
+  if (llvm::StructType *STy = dyn_cast<llvm::StructType>(IRType)) {
+    if (!STy->getNumContainedTypes())
+      return nullptr;
+
+    const llvm::StructLayout *SL = TD.getStructLayout(STy);
+    unsigned Elt = SL->getElementContainingOffset(IROffset);
+    IROffset -= SL->getElementOffset(Elt);
+    return getFPTypeAtOffset(STy->getElementType(Elt), IROffset, TD);
+  }
+
+  // If this is an array, recurse into the field at the specified offset.
+  if (llvm::ArrayType *ATy = dyn_cast<llvm::ArrayType>(IRType)) {
+    llvm::Type *EltTy = ATy->getElementType();
+    unsigned EltSize = TD.getTypeAllocSize(EltTy);
+    IROffset -= IROffset / EltSize * EltSize;
+    return getFPTypeAtOffset(EltTy, IROffset, TD);
+  }
+
+  return nullptr;
+}
+
+/// GetSSETypeAtOffset - Return a type that will be passed by the backend in the
+/// low 8 bytes of an XMM register, corresponding to the SSE class.
+llvm::Type *X86_64ABIInfo::GetSSETypeAtOffset(llvm::Type *IRType,
+                                              unsigned IROffset,
+                                              QualType SourceTy,
+                                              unsigned SourceOffset) const {
+  const llvm::DataLayout &TD = getDataLayout();
+  unsigned SourceSize =
+      (unsigned)getContext().getTypeSize(SourceTy) / 8 - SourceOffset;
+  llvm::Type *T0 = getFPTypeAtOffset(IRType, IROffset, TD);
+  if (!T0 || T0->isDoubleTy())
+    return llvm::Type::getDoubleTy(getVMContext());
+
+  // Get the adjacent FP type.
+  llvm::Type *T1 = nullptr;
+  unsigned T0Size = TD.getTypeAllocSize(T0);
+  if (SourceSize > T0Size)
+    T1 = getFPTypeAtOffset(IRType, IROffset + T0Size, TD);
+  if (T1 == nullptr) {
+    // Check if IRType is a half/bfloat + float. float type will be in
+    // IROffset+4 due to its alignment.
+    if (T0->is16bitFPTy() && SourceSize > 4)
+      T1 = getFPTypeAtOffset(IRType, IROffset + 4, TD);
+    // If we can't get a second FP type, return a simple half or float.
+    // avx512fp16-abi.c:pr51813_2 shows it works to return float for
+    // {float, i8} too.
+    if (T1 == nullptr)
+      return T0;
+  }
+
+  if (T0->isFloatTy() && T1->isFloatTy())
+    return llvm::FixedVectorType::get(T0, 2);
+
+  if (T0->is16bitFPTy() && T1->is16bitFPTy()) {
+    llvm::Type *T2 = nullptr;
+    if (SourceSize > 4)
+      T2 = getFPTypeAtOffset(IRType, IROffset + 4, TD);
+    if (T2 == nullptr)
+      return llvm::FixedVectorType::get(T0, 2);
+    return llvm::FixedVectorType::get(T0, 4);
+  }
+
+  if (T0->is16bitFPTy() || T1->is16bitFPTy())
+    return llvm::FixedVectorType::get(llvm::Type::getHalfTy(getVMContext()), 4);
+
+  return llvm::Type::getDoubleTy(getVMContext());
+}
+
+/// GetINTEGERTypeAtOffset - The ABI specifies that a value should be passed in
+/// an 8-byte GPR.  This means that we either have a scalar or we are talking
+/// about the high or low part of an up-to-16-byte struct.  This routine picks
+/// the best LLVM IR type to represent this, which may be i64 or may be anything
+/// else that the backend will pass in a GPR that works better (e.g. i8, %foo*,
+/// etc).
+///
+/// PrefType is an LLVM IR type that corresponds to (part of) the IR type for
+/// the source type.  IROffset is an offset in bytes into the LLVM IR type that
+/// the 8-byte value references.  PrefType may be null.
+///
+/// SourceTy is the source-level type for the entire argument.  SourceOffset is
+/// an offset into this that we're processing (which is always either 0 or 8).
+///
+llvm::Type *X86_64ABIInfo::GetINTEGERTypeAtOffset(llvm::Type *IRType,
+                                                  unsigned IROffset,
+                                                  QualType SourceTy,
+                                                  unsigned SourceOffset) const {
+  // If we're dealing with an un-offset LLVM IR type, then it means that we're
+  // returning an 8-byte unit starting with it.  See if we can safely use it.
+  if (IROffset == 0) {
+    // Pointers and int64's always fill the 8-byte unit.
+    if ((isa<llvm::PointerType>(IRType) && Has64BitPointers) ||
+        IRType->isIntegerTy(64))
+      return IRType;
+
+    // If we have a 1/2/4-byte integer, we can use it only if the rest of the
+    // goodness in the source type is just tail padding.  This is allowed to
+    // kick in for struct {double,int} on the int, but not on
+    // struct{double,int,int} because we wouldn't return the second int.  We
+    // have to do this analysis on the source type because we can't depend on
+    // unions being lowered a specific way etc.
+    if (IRType->isIntegerTy(8) || IRType->isIntegerTy(16) ||
+        IRType->isIntegerTy(32) ||
+        (isa<llvm::PointerType>(IRType) && !Has64BitPointers)) {
+      unsigned BitWidth = isa<llvm::PointerType>(IRType)
+                              ? 32
+                              : cast<llvm::IntegerType>(IRType)->getBitWidth();
+
+      if (BitsContainNoUserData(SourceTy, SourceOffset * 8 + BitWidth,
+                                SourceOffset * 8 + 64, getContext()))
+        return IRType;
+    }
+  }
+
+  if (llvm::StructType *STy = dyn_cast<llvm::StructType>(IRType)) {
+    // If this is a struct, recurse into the field at the specified offset.
+    const llvm::StructLayout *SL = getDataLayout().getStructLayout(STy);
+    if (IROffset < SL->getSizeInBytes()) {
+      unsigned FieldIdx = SL->getElementContainingOffset(IROffset);
+      IROffset -= SL->getElementOffset(FieldIdx);
+
+      return GetINTEGERTypeAtOffset(STy->getElementType(FieldIdx), IROffset,
+                                    SourceTy, SourceOffset);
+    }
+  }
+
+  if (llvm::ArrayType *ATy = dyn_cast<llvm::ArrayType>(IRType)) {
+    llvm::Type *EltTy = ATy->getElementType();
+    unsigned EltSize = getDataLayout().getTypeAllocSize(EltTy);
+    unsigned EltOffset = IROffset / EltSize * EltSize;
+    return GetINTEGERTypeAtOffset(EltTy, IROffset - EltOffset, SourceTy,
+                                  SourceOffset);
+  }
+
+  // Okay, we don't have any better idea of what to pass, so we pass this in an
+  // integer register that isn't too big to fit the rest of the struct.
+  unsigned TySizeInBytes =
+      (unsigned)getContext().getTypeSizeInChars(SourceTy).getQuantity();
+
+  assert(TySizeInBytes != SourceOffset && "Empty field?");
+
+  // It is always safe to classify this as an integer type up to i64 that
+  // isn't larger than the structure.
+  return llvm::IntegerType::get(getVMContext(),
+                                std::min(TySizeInBytes - SourceOffset, 8U) * 8);
+}
+
+/// GetX86_64ByValArgumentPair - Given a high and low type that can ideally
+/// be used as elements of a two register pair to pass or return, return a
+/// first class aggregate to represent them.  For example, if the low part of
+/// a by-value argument should be passed as i32* and the high part as float,
+/// return {i32*, float}.
+static llvm::Type *GetX86_64ByValArgumentPair(llvm::Type *Lo, llvm::Type *Hi,
+                                              const llvm::DataLayout &TD) {
+  // In order to correctly satisfy the ABI, we need to the high part to start
+  // at offset 8.  If the high and low parts we inferred are both 4-byte types
+  // (e.g. i32 and i32) then the resultant struct type ({i32,i32}) won't have
+  // the second element at offset 8.  Check for this:
+  unsigned LoSize = (unsigned)TD.getTypeAllocSize(Lo);
+  llvm::Align HiAlign = TD.getABITypeAlign(Hi);
+  unsigned HiStart = llvm::alignTo(LoSize, HiAlign);
+  assert(HiStart != 0 && HiStart <= 8 && "Invalid x86-64 argument pair!");
+
+  // To handle this, we have to increase the size of the low part so that the
+  // second element will start at an 8 byte offset.  We can't increase the size
+  // of the second element because it might make us access off the end of the
+  // struct.
+  if (HiStart != 8) {
+    // There are usually two sorts of types the ABI generation code can produce
+    // for the low part of a pair that aren't 8 bytes in size: half, float or
+    // i8/i16/i32.  This can also include pointers when they are 32-bit (X32 and
+    // NaCl).
+    // Promote these to a larger type.
+    if (Lo->isHalfTy() || Lo->isFloatTy())
+      Lo = llvm::Type::getDoubleTy(Lo->getContext());
+    else {
+      assert((Lo->isIntegerTy() || Lo->isPointerTy()) &&
+             "Invalid/unknown lo type");
+      Lo = llvm::Type::getInt64Ty(Lo->getContext());
+    }
+  }
+
+  llvm::StructType *Result = llvm::StructType::get(Lo, Hi);
+
+  // Verify that the second element is at an 8-byte offset.
+  assert(TD.getStructLayout(Result)->getElementOffset(1) == 8 &&
+         "Invalid x86-64 argument pair!");
+  return Result;
+}
+
+ABIArgInfo X86_64ABIInfo::classifyReturnType(QualType RetTy) const {
+  // AMD64-ABI 3.2.3p4: Rule 1. Classify the return type with the
+  // classification algorithm.
+  X86_64ABIInfo::Class Lo, Hi;
+  classify(RetTy, 0, Lo, Hi, /*isNamedArg*/ true);
+
+  // Check some invariants.
+  assert((Hi != Memory || Lo == Memory) && "Invalid memory classification.");
+  assert((Hi != SSEUp || Lo == SSE) && "Invalid SSEUp classification.");
+
+  llvm::Type *ResType = nullptr;
+  switch (Lo) {
+  case NoClass:
+    if (Hi == NoClass)
+      return ABIArgInfo::getIgnore();
+    // If the low part is just padding, it takes no register, leave ResType
+    // null.
+    assert((Hi == SSE || Hi == Integer || Hi == X87Up) &&
+           "Unknown missing lo part");
+    break;
+
+  case SSEUp:
+  case X87Up:
+    llvm_unreachable("Invalid classification for lo word.");
+
+    // AMD64-ABI 3.2.3p4: Rule 2. Types of class memory are returned via
+    // hidden argument.
+  case Memory:
+    return getIndirectReturnResult(RetTy);
+
+    // AMD64-ABI 3.2.3p4: Rule 3. If the class is INTEGER, the next
+    // available register of the sequence %rax, %rdx is used.
+  case Integer:
+    ResType = GetINTEGERTypeAtOffset(CGT.ConvertType(RetTy), 0, RetTy, 0);
+
+    // If we have a sign or zero extended integer, make sure to return Extend
+    // so that the parameter gets the right LLVM IR attributes.
+    if (Hi == NoClass && isa<llvm::IntegerType>(ResType)) {
+      // Treat an enum type as its underlying type.
+      if (const EnumType *EnumTy = RetTy->getAs<EnumType>())
+        RetTy = EnumTy->getDecl()->getIntegerType();
+
+      if (RetTy->isIntegralOrEnumerationType() &&
+          isPromotableIntegerTypeForABI(RetTy))
+        return ABIArgInfo::getExtend(RetTy);
+    }
+    break;
+
+    // AMD64-ABI 3.2.3p4: Rule 4. If the class is SSE, the next
+    // available SSE register of the sequence %xmm0, %xmm1 is used.
+  case SSE:
+    ResType = GetSSETypeAtOffset(CGT.ConvertType(RetTy), 0, RetTy, 0);
+    break;
+
+    // AMD64-ABI 3.2.3p4: Rule 6. If the class is X87, the value is
+    // returned on the X87 stack in %st0 as 80-bit x87 number.
+  case X87:
+    ResType = llvm::Type::getX86_FP80Ty(getVMContext());
+    break;
+
+    // AMD64-ABI 3.2.3p4: Rule 8. If the class is COMPLEX_X87, the real
+    // part of the value is returned in %st0 and the imaginary part in
+    // %st1.
+  case ComplexX87:
+    assert(Hi == ComplexX87 && "Unexpected ComplexX87 classification.");
+    ResType = llvm::StructType::get(llvm::Type::getX86_FP80Ty(getVMContext()),
+                                    llvm::Type::getX86_FP80Ty(getVMContext()));
+    break;
+  }
+
+  llvm::Type *HighPart = nullptr;
+  switch (Hi) {
+    // Memory was handled previously and X87 should
+    // never occur as a hi class.
+  case Memory:
+  case X87:
+    llvm_unreachable("Invalid classification for hi word.");
+
+  case ComplexX87: // Previously handled.
+  case NoClass:
+    break;
+
+  case Integer:
+    HighPart = GetINTEGERTypeAtOffset(CGT.ConvertType(RetTy), 8, RetTy, 8);
+    if (Lo == NoClass) // Return HighPart at offset 8 in memory.
+      return ABIArgInfo::getDirect(HighPart, 8);
+    break;
+  case SSE:
+    HighPart = GetSSETypeAtOffset(CGT.ConvertType(RetTy), 8, RetTy, 8);
+    if (Lo == NoClass) // Return HighPart at offset 8 in memory.
+      return ABIArgInfo::getDirect(HighPart, 8);
+    break;
+
+    // AMD64-ABI 3.2.3p4: Rule 5. If the class is SSEUP, the eightbyte
+    // is passed in the next available eightbyte chunk if the last used
+    // vector register.
+    //
+    // SSEUP should always be preceded by SSE, just widen.
+  case SSEUp:
+    assert(Lo == SSE && "Unexpected SSEUp classification.");
+    ResType = GetByteVectorType(RetTy);
+    break;
+
+    // AMD64-ABI 3.2.3p4: Rule 7. If the class is X87UP, the value is
+    // returned together with the previous X87 value in %st0.
+  case X87Up:
+    // If X87Up is preceded by X87, we don't need to do
+    // anything. However, in some cases with unions it may not be
+    // preceded by X87. In such situations we follow gcc and pass the
+    // extra bits in an SSE reg.
+    if (Lo != X87) {
+      HighPart = GetSSETypeAtOffset(CGT.ConvertType(RetTy), 8, RetTy, 8);
+      if (Lo == NoClass) // Return HighPart at offset 8 in memory.
+        return ABIArgInfo::getDirect(HighPart, 8);
+    }
+    break;
+  }
+
+  // If a high part was specified, merge it together with the low part.  It is
+  // known to pass in the high eightbyte of the result.  We do this by forming a
+  // first class struct aggregate with the high and low part: {low, high}
+  if (HighPart)
+    ResType = GetX86_64ByValArgumentPair(ResType, HighPart, getDataLayout());
+
+  return ABIArgInfo::getDirect(ResType);
+}
+
+ABIArgInfo
+X86_64ABIInfo::classifyArgumentType(QualType Ty, unsigned freeIntRegs,
+                                    unsigned &neededInt, unsigned &neededSSE,
+                                    bool isNamedArg, bool IsRegCall) const {
+  Ty = useFirstFieldIfTransparentUnion(Ty);
+
+  X86_64ABIInfo::Class Lo, Hi;
+  classify(Ty, 0, Lo, Hi, isNamedArg, IsRegCall);
+
+  // Check some invariants.
+  // FIXME: Enforce these by construction.
+  assert((Hi != Memory || Lo == Memory) && "Invalid memory classification.");
+  assert((Hi != SSEUp || Lo == SSE) && "Invalid SSEUp classification.");
+
+  neededInt = 0;
+  neededSSE = 0;
+  llvm::Type *ResType = nullptr;
+  switch (Lo) {
+  case NoClass:
+    if (Hi == NoClass)
+      return ABIArgInfo::getIgnore();
+    // If the low part is just padding, it takes no register, leave ResType
+    // null.
+    assert((Hi == SSE || Hi == Integer || Hi == X87Up) &&
+           "Unknown missing lo part");
+    break;
+
+    // AMD64-ABI 3.2.3p3: Rule 1. If the class is MEMORY, pass the argument
+    // on the stack.
+  case Memory:
+
+    // AMD64-ABI 3.2.3p3: Rule 5. If the class is X87, X87UP or
+    // COMPLEX_X87, it is passed in memory.
+  case X87:
+  case ComplexX87:
+    if (getRecordArgABI(Ty, getCXXABI()) == CGCXXABI::RAA_Indirect)
+      ++neededInt;
+    return getIndirectResult(Ty, freeIntRegs);
+
+  case SSEUp:
+  case X87Up:
+    llvm_unreachable("Invalid classification for lo word.");
+
+    // AMD64-ABI 3.2.3p3: Rule 2. If the class is INTEGER, the next
+    // available register of the sequence %rdi, %rsi, %rdx, %rcx, %r8
+    // and %r9 is used.
+  case Integer:
+    ++neededInt;
+
+    // Pick an 8-byte type based on the preferred type.
+    ResType = GetINTEGERTypeAtOffset(CGT.ConvertType(Ty), 0, Ty, 0);
+
+    // If we have a sign or zero extended integer, make sure to return Extend
+    // so that the parameter gets the right LLVM IR attributes.
+    if (Hi == NoClass && isa<llvm::IntegerType>(ResType)) {
+      // Treat an enum type as its underlying type.
+      if (const EnumType *EnumTy = Ty->getAs<EnumType>())
+        Ty = EnumTy->getDecl()->getIntegerType();
+
+      if (Ty->isIntegralOrEnumerationType() &&
+          isPromotableIntegerTypeForABI(Ty))
+        return ABIArgInfo::getExtend(Ty);
+    }
+
+    break;
+
+    // AMD64-ABI 3.2.3p3: Rule 3. If the class is SSE, the next
+    // available SSE register is used, the registers are taken in the
+    // order from %xmm0 to %xmm7.
+  case SSE: {
+    llvm::Type *IRType = CGT.ConvertType(Ty);
+    ResType = GetSSETypeAtOffset(IRType, 0, Ty, 0);
+    ++neededSSE;
+    break;
+  }
+  }
+
+  llvm::Type *HighPart = nullptr;
+  switch (Hi) {
+    // Memory was handled previously, ComplexX87 and X87 should
+    // never occur as hi classes, and X87Up must be preceded by X87,
+    // which is passed in memory.
+  case Memory:
+  case X87:
+  case ComplexX87:
+    llvm_unreachable("Invalid classification for hi word.");
+
+  case NoClass:
+    break;
+
+  case Integer:
+    ++neededInt;
+    // Pick an 8-byte type based on the preferred type.
+    HighPart = GetINTEGERTypeAtOffset(CGT.ConvertType(Ty), 8, Ty, 8);
+
+    if (Lo == NoClass) // Pass HighPart at offset 8 in memory.
+      return ABIArgInfo::getDirect(HighPart, 8);
+    break;
+
+    // X87Up generally doesn't occur here (long double is passed in
+    // memory), except in situations involving unions.
+  case X87Up:
+  case SSE:
+    HighPart = GetSSETypeAtOffset(CGT.ConvertType(Ty), 8, Ty, 8);
+
+    if (Lo == NoClass) // Pass HighPart at offset 8 in memory.
+      return ABIArgInfo::getDirect(HighPart, 8);
+
+    ++neededSSE;
+    break;
+
+    // AMD64-ABI 3.2.3p3: Rule 4. If the class is SSEUP, the
+    // eightbyte is passed in the upper half of the last used SSE
+    // register.  This only happens when 128-bit vectors are passed.
+  case SSEUp:
+    assert(Lo == SSE && "Unexpected SSEUp classification");
+    ResType = GetByteVectorType(Ty);
+    break;
+  }
+
+  // If a high part was specified, merge it together with the low part.  It is
+  // known to pass in the high eightbyte of the result.  We do this by forming a
+  // first class struct aggregate with the high and low part: {low, high}
+  if (HighPart)
+    ResType = GetX86_64ByValArgumentPair(ResType, HighPart, getDataLayout());
+
+  return ABIArgInfo::getDirect(ResType);
+}
+
+ABIArgInfo
+X86_64ABIInfo::classifyRegCallStructTypeImpl(QualType Ty, unsigned &NeededInt,
+                                             unsigned &NeededSSE,
+                                             unsigned &MaxVectorWidth) const {
+  auto RT = Ty->getAs<RecordType>();
+  assert(RT && "classifyRegCallStructType only valid with struct types");
+
+  if (RT->getDecl()->hasFlexibleArrayMember())
+    return getIndirectReturnResult(Ty);
+
+  // Sum up bases
+  if (auto CXXRD = dyn_cast<CXXRecordDecl>(RT->getDecl())) {
+    if (CXXRD->isDynamicClass()) {
+      NeededInt = NeededSSE = 0;
+      return getIndirectReturnResult(Ty);
+    }
+
+    for (const auto &I : CXXRD->bases())
+      if (classifyRegCallStructTypeImpl(I.getType(), NeededInt, NeededSSE,
+                                        MaxVectorWidth)
+              .isIndirect()) {
+        NeededInt = NeededSSE = 0;
+        return getIndirectReturnResult(Ty);
+      }
+  }
+
+  // Sum up members
+  for (const auto *FD : RT->getDecl()->fields()) {
+    QualType MTy = FD->getType();
+    if (MTy->isRecordType() && !MTy->isUnionType()) {
+      if (classifyRegCallStructTypeImpl(MTy, NeededInt, NeededSSE,
+                                        MaxVectorWidth)
+              .isIndirect()) {
+        NeededInt = NeededSSE = 0;
+        return getIndirectReturnResult(Ty);
+      }
+    } else {
+      unsigned LocalNeededInt, LocalNeededSSE;
+      if (classifyArgumentType(MTy, UINT_MAX, LocalNeededInt, LocalNeededSSE,
+                               true, true)
+              .isIndirect()) {
+        NeededInt = NeededSSE = 0;
+        return getIndirectReturnResult(Ty);
+      }
+      if (const auto *AT = getContext().getAsConstantArrayType(MTy))
+        MTy = AT->getElementType();
+      if (const auto *VT = MTy->getAs<VectorType>())
+        if (getContext().getTypeSize(VT) > MaxVectorWidth)
+          MaxVectorWidth = getContext().getTypeSize(VT);
+      NeededInt += LocalNeededInt;
+      NeededSSE += LocalNeededSSE;
+    }
+  }
+
+  return ABIArgInfo::getDirect();
+}
+
+ABIArgInfo
+X86_64ABIInfo::classifyRegCallStructType(QualType Ty, unsigned &NeededInt,
+                                         unsigned &NeededSSE,
+                                         unsigned &MaxVectorWidth) const {
+
+  NeededInt = 0;
+  NeededSSE = 0;
+  MaxVectorWidth = 0;
+
+  return classifyRegCallStructTypeImpl(Ty, NeededInt, NeededSSE,
+                                       MaxVectorWidth);
+}
+
+void X86_64ABIInfo::computeInfo(CGFunctionInfo &FI) const {
+
+  const unsigned CallingConv = FI.getCallingConvention();
+  // It is possible to force Win64 calling convention on any x86_64 target by
+  // using __attribute__((ms_abi)). In such case to correctly emit Win64
+  // compatible code delegate this call to WinX86_64ABIInfo::computeInfo.
+  if (CallingConv == llvm::CallingConv::Win64) {
+    WinX86_64ABIInfo Win64ABIInfo(CGT, AVXLevel);
+    Win64ABIInfo.computeInfo(FI);
+    return;
+  }
+
+  bool IsRegCall = CallingConv == llvm::CallingConv::X86_RegCall;
+
+  // Keep track of the number of assigned registers.
+  unsigned FreeIntRegs = IsRegCall ? 11 : 6;
+  unsigned FreeSSERegs = IsRegCall ? 16 : 8;
+  unsigned NeededInt = 0, NeededSSE = 0, MaxVectorWidth = 0;
+
+  if (!::classifyReturnType(getCXXABI(), FI, *this)) {
+    if (IsRegCall && FI.getReturnType()->getTypePtr()->isRecordType() &&
+        !FI.getReturnType()->getTypePtr()->isUnionType()) {
+      FI.getReturnInfo() = classifyRegCallStructType(
+          FI.getReturnType(), NeededInt, NeededSSE, MaxVectorWidth);
+      if (FreeIntRegs >= NeededInt && FreeSSERegs >= NeededSSE) {
+        FreeIntRegs -= NeededInt;
+        FreeSSERegs -= NeededSSE;
+      } else {
+        FI.getReturnInfo() = getIndirectReturnResult(FI.getReturnType());
+      }
+    } else if (IsRegCall && FI.getReturnType()->getAs<ComplexType>() &&
+               getContext().getCanonicalType(FI.getReturnType()
+                                                 ->getAs<ComplexType>()
+                                                 ->getElementType()) ==
+                   getContext().LongDoubleTy)
+      // Complex Long Double Type is passed in Memory when Regcall
+      // calling convention is used.
+      FI.getReturnInfo() = getIndirectReturnResult(FI.getReturnType());
+    else
+      FI.getReturnInfo() = classifyReturnType(FI.getReturnType());
+  }
+
+  // If the return value is indirect, then the hidden argument is consuming one
+  // integer register.
+  if (FI.getReturnInfo().isIndirect())
+    --FreeIntRegs;
+  else if (NeededSSE && MaxVectorWidth > 0)
+    FI.setMaxVectorWidth(MaxVectorWidth);
+
+  // The chain argument effectively gives us another free register.
+  if (FI.isChainCall())
+    ++FreeIntRegs;
+
+  unsigned NumRequiredArgs = FI.getNumRequiredArgs();
+  // AMD64-ABI 3.2.3p3: Once arguments are classified, the registers
+  // get assigned (in left-to-right order) for passing as follows...
+  unsigned ArgNo = 0;
+  for (CGFunctionInfo::arg_iterator it = FI.arg_begin(), ie = FI.arg_end();
+       it != ie; ++it, ++ArgNo) {
+    bool IsNamedArg = ArgNo < NumRequiredArgs;
+
+    if (IsRegCall && it->type->isStructureOrClassType())
+      it->info = classifyRegCallStructType(it->type, NeededInt, NeededSSE,
+                                           MaxVectorWidth);
+    else
+      it->info = classifyArgumentType(it->type, FreeIntRegs, NeededInt,
+                                      NeededSSE, IsNamedArg);
+
+    // AMD64-ABI 3.2.3p3: If there are no registers available for any
+    // eightbyte of an argument, the whole argument is passed on the
+    // stack. If registers have already been assigned for some
+    // eightbytes of such an argument, the assignments get reverted.
+    if (FreeIntRegs >= NeededInt && FreeSSERegs >= NeededSSE) {
+      FreeIntRegs -= NeededInt;
+      FreeSSERegs -= NeededSSE;
+      if (MaxVectorWidth > FI.getMaxVectorWidth())
+        FI.setMaxVectorWidth(MaxVectorWidth);
+    } else {
+      it->info = getIndirectResult(it->type, FreeIntRegs);
+    }
+  }
+}
+
+static Address EmitX86_64VAArgFromMemory(CodeGenFunction &CGF,
+                                         Address VAListAddr, QualType Ty) {
+  Address overflow_arg_area_p =
+      CGF.Builder.CreateStructGEP(VAListAddr, 2, "overflow_arg_area_p");
+  llvm::Value *overflow_arg_area =
+      CGF.Builder.CreateLoad(overflow_arg_area_p, "overflow_arg_area");
+
+  // AMD64-ABI 3.5.7p5: Step 7. Align l->overflow_arg_area upwards to a 16
+  // byte boundary if alignment needed by type exceeds 8 byte boundary.
+  // It isn't stated explicitly in the standard, but in practice we use
+  // alignment greater than 16 where necessary.
+  CharUnits Align = CGF.getContext().getTypeAlignInChars(Ty);
+  if (Align > CharUnits::fromQuantity(8)) {
+    overflow_arg_area =
+        emitRoundPointerUpToAlignment(CGF, overflow_arg_area, Align);
+  }
+
+  // AMD64-ABI 3.5.7p5: Step 8. Fetch type from l->overflow_arg_area.
+  llvm::Type *LTy = CGF.ConvertTypeForMem(Ty);
+  llvm::Value *Res = CGF.Builder.CreateBitCast(
+      overflow_arg_area, llvm::PointerType::getUnqual(LTy));
+
+  // AMD64-ABI 3.5.7p5: Step 9. Set l->overflow_arg_area to:
+  // l->overflow_arg_area + sizeof(type).
+  // AMD64-ABI 3.5.7p5: Step 10. Align l->overflow_arg_area upwards to
+  // an 8 byte boundary.
+
+  uint64_t SizeInBytes = (CGF.getContext().getTypeSize(Ty) + 7) / 8;
+  llvm::Value *Offset =
+      llvm::ConstantInt::get(CGF.Int32Ty, (SizeInBytes + 7) & ~7);
+  overflow_arg_area = CGF.Builder.CreateGEP(CGF.Int8Ty, overflow_arg_area,
+                                            Offset, "overflow_arg_area.next");
+  CGF.Builder.CreateStore(overflow_arg_area, overflow_arg_area_p);
+
+  // AMD64-ABI 3.5.7p5: Step 11. Return the fetched type.
+  return Address(Res, LTy, Align);
+}
+
+Address X86_64ABIInfo::EmitVAArg(CodeGenFunction &CGF, Address VAListAddr,
+                                 QualType Ty) const {
+  // Assume that va_list type is correct; should be pointer to LLVM type:
+  // struct {
+  //   i32 gp_offset;
+  //   i32 fp_offset;
+  //   i8* overflow_arg_area;
+  //   i8* reg_save_area;
+  // };
+  unsigned neededInt, neededSSE;
+
+  Ty = getContext().getCanonicalType(Ty);
+  ABIArgInfo AI = classifyArgumentType(Ty, 0, neededInt, neededSSE,
+                                       /*isNamedArg*/ false);
+
+  // AMD64-ABI 3.5.7p5: Step 1. Determine whether type may be passed
+  // in the registers. If not go to step 7.
+  if (!neededInt && !neededSSE)
+    return EmitX86_64VAArgFromMemory(CGF, VAListAddr, Ty);
+
+  // AMD64-ABI 3.5.7p5: Step 2. Compute num_gp to hold the number of
+  // general purpose registers needed to pass type and num_fp to hold
+  // the number of floating point registers needed.
+
+  // AMD64-ABI 3.5.7p5: Step 3. Verify whether arguments fit into
+  // registers. In the case: l->gp_offset > 48 - num_gp * 8 or
+  // l->fp_offset > 304 - num_fp * 16 go to step 7.
+  //
+  // NOTE: 304 is a typo, there are (6 * 8 + 8 * 16) = 176 bytes of
+  // register save space).
+
+  llvm::Value *InRegs = nullptr;
+  Address gp_offset_p = Address::invalid(), fp_offset_p = Address::invalid();
+  llvm::Value *gp_offset = nullptr, *fp_offset = nullptr;
+  if (neededInt) {
+    gp_offset_p = CGF.Builder.CreateStructGEP(VAListAddr, 0, "gp_offset_p");
+    gp_offset = CGF.Builder.CreateLoad(gp_offset_p, "gp_offset");
+    InRegs = llvm::ConstantInt::get(CGF.Int32Ty, 48 - neededInt * 8);
+    InRegs = CGF.Builder.CreateICmpULE(gp_offset, InRegs, "fits_in_gp");
+  }
+
+  if (neededSSE) {
+    fp_offset_p = CGF.Builder.CreateStructGEP(VAListAddr, 1, "fp_offset_p");
+    fp_offset = CGF.Builder.CreateLoad(fp_offset_p, "fp_offset");
+    llvm::Value *FitsInFP =
+        llvm::ConstantInt::get(CGF.Int32Ty, 176 - neededSSE * 16);
+    FitsInFP = CGF.Builder.CreateICmpULE(fp_offset, FitsInFP, "fits_in_fp");
+    InRegs = InRegs ? CGF.Builder.CreateAnd(InRegs, FitsInFP) : FitsInFP;
+  }
+
+  llvm::BasicBlock *InRegBlock = CGF.createBasicBlock("vaarg.in_reg");
+  llvm::BasicBlock *InMemBlock = CGF.createBasicBlock("vaarg.in_mem");
+  llvm::BasicBlock *ContBlock = CGF.createBasicBlock("vaarg.end");
+  CGF.Builder.CreateCondBr(InRegs, InRegBlock, InMemBlock);
+
+  // Emit code to load the value if it was passed in registers.
+
+  CGF.EmitBlock(InRegBlock);
+
+  // AMD64-ABI 3.5.7p5: Step 4. Fetch type from l->reg_save_area with
+  // an offset of l->gp_offset and/or l->fp_offset. This may require
+  // copying to a temporary location in case the parameter is passed
+  // in different register classes or requires an alignment greater
+  // than 8 for general purpose registers and 16 for XMM registers.
+  //
+  // FIXME: This really results in shameful code when we end up needing to
+  // collect arguments from different places; often what should result in a
+  // simple assembling of a structure from scattered addresses has many more
+  // loads than necessary. Can we clean this up?
+  llvm::Type *LTy = CGF.ConvertTypeForMem(Ty);
+  llvm::Value *RegSaveArea = CGF.Builder.CreateLoad(
+      CGF.Builder.CreateStructGEP(VAListAddr, 3), "reg_save_area");
+
+  Address RegAddr = Address::invalid();
+  if (neededInt && neededSSE) {
+    // FIXME: Cleanup.
+    assert(AI.isDirect() && "Unexpected ABI info for mixed regs");
+    llvm::StructType *ST = cast<llvm::StructType>(AI.getCoerceToType());
+    Address Tmp = CGF.CreateMemTemp(Ty);
+    Tmp = CGF.Builder.CreateElementBitCast(Tmp, ST);
+    assert(ST->getNumElements() == 2 && "Unexpected ABI info for mixed regs");
+    llvm::Type *TyLo = ST->getElementType(0);
+    llvm::Type *TyHi = ST->getElementType(1);
+    assert((TyLo->isFPOrFPVectorTy() ^ TyHi->isFPOrFPVectorTy()) &&
+           "Unexpected ABI info for mixed regs");
+    llvm::Type *PTyLo = llvm::PointerType::getUnqual(TyLo);
+    llvm::Type *PTyHi = llvm::PointerType::getUnqual(TyHi);
+    llvm::Value *GPAddr =
+        CGF.Builder.CreateGEP(CGF.Int8Ty, RegSaveArea, gp_offset);
+    llvm::Value *FPAddr =
+        CGF.Builder.CreateGEP(CGF.Int8Ty, RegSaveArea, fp_offset);
+    llvm::Value *RegLoAddr = TyLo->isFPOrFPVectorTy() ? FPAddr : GPAddr;
+    llvm::Value *RegHiAddr = TyLo->isFPOrFPVectorTy() ? GPAddr : FPAddr;
+
+    // Copy the first element.
+    // FIXME: Our choice of alignment here and below is probably pessimistic.
+    llvm::Value *V = CGF.Builder.CreateAlignedLoad(
+        TyLo, CGF.Builder.CreateBitCast(RegLoAddr, PTyLo),
+        CharUnits::fromQuantity(getDataLayout().getABITypeAlign(TyLo)));
+    CGF.Builder.CreateStore(V, CGF.Builder.CreateStructGEP(Tmp, 0));
+
+    // Copy the second element.
+    V = CGF.Builder.CreateAlignedLoad(
+        TyHi, CGF.Builder.CreateBitCast(RegHiAddr, PTyHi),
+        CharUnits::fromQuantity(getDataLayout().getABITypeAlign(TyHi)));
+    CGF.Builder.CreateStore(V, CGF.Builder.CreateStructGEP(Tmp, 1));
+
+    RegAddr = CGF.Builder.CreateElementBitCast(Tmp, LTy);
+  } else if (neededInt) {
+    RegAddr = Address(CGF.Builder.CreateGEP(CGF.Int8Ty, RegSaveArea, gp_offset),
+                      CGF.Int8Ty, CharUnits::fromQuantity(8));
+    RegAddr = CGF.Builder.CreateElementBitCast(RegAddr, LTy);
+
+    // Copy to a temporary if necessary to ensure the appropriate alignment.
+    auto TInfo = getContext().getTypeInfoInChars(Ty);
+    uint64_t TySize = TInfo.Width.getQuantity();
+    CharUnits TyAlign = TInfo.Align;
+
+    // Copy into a temporary if the type is more aligned than the
+    // register save area.
+    if (TyAlign.getQuantity() > 8) {
+      Address Tmp = CGF.CreateMemTemp(Ty);
+      CGF.Builder.CreateMemCpy(Tmp, RegAddr, TySize, false);
+      RegAddr = Tmp;
+    }
+
+  } else if (neededSSE == 1) {
+    RegAddr = Address(CGF.Builder.CreateGEP(CGF.Int8Ty, RegSaveArea, fp_offset),
+                      CGF.Int8Ty, CharUnits::fromQuantity(16));
+    RegAddr = CGF.Builder.CreateElementBitCast(RegAddr, LTy);
+  } else {
+    assert(neededSSE == 2 && "Invalid number of needed registers!");
+    // SSE registers are spaced 16 bytes apart in the register save
+    // area, we need to collect the two eightbytes together.
+    // The ABI isn't explicit about this, but it seems reasonable
+    // to assume that the slots are 16-byte aligned, since the stack is
+    // naturally 16-byte aligned and the prologue is expected to store
+    // all the SSE registers to the RSA.
+    Address RegAddrLo =
+        Address(CGF.Builder.CreateGEP(CGF.Int8Ty, RegSaveArea, fp_offset),
+                CGF.Int8Ty, CharUnits::fromQuantity(16));
+    Address RegAddrHi = CGF.Builder.CreateConstInBoundsByteGEP(
+        RegAddrLo, CharUnits::fromQuantity(16));
+    llvm::Type *ST = AI.canHaveCoerceToType()
+                         ? AI.getCoerceToType()
+                         : llvm::StructType::get(CGF.DoubleTy, CGF.DoubleTy);
+    llvm::Value *V;
+    Address Tmp = CGF.CreateMemTemp(Ty);
+    Tmp = CGF.Builder.CreateElementBitCast(Tmp, ST);
+    V = CGF.Builder.CreateLoad(CGF.Builder.CreateElementBitCast(
+        RegAddrLo, ST->getStructElementType(0)));
+    CGF.Builder.CreateStore(V, CGF.Builder.CreateStructGEP(Tmp, 0));
+    V = CGF.Builder.CreateLoad(CGF.Builder.CreateElementBitCast(
+        RegAddrHi, ST->getStructElementType(1)));
+    CGF.Builder.CreateStore(V, CGF.Builder.CreateStructGEP(Tmp, 1));
+
+    RegAddr = CGF.Builder.CreateElementBitCast(Tmp, LTy);
+  }
+
+  // AMD64-ABI 3.5.7p5: Step 5. Set:
+  // l->gp_offset = l->gp_offset + num_gp * 8
+  // l->fp_offset = l->fp_offset + num_fp * 16.
+  if (neededInt) {
+    llvm::Value *Offset = llvm::ConstantInt::get(CGF.Int32Ty, neededInt * 8);
+    CGF.Builder.CreateStore(CGF.Builder.CreateAdd(gp_offset, Offset),
+                            gp_offset_p);
+  }
+  if (neededSSE) {
+    llvm::Value *Offset = llvm::ConstantInt::get(CGF.Int32Ty, neededSSE * 16);
+    CGF.Builder.CreateStore(CGF.Builder.CreateAdd(fp_offset, Offset),
+                            fp_offset_p);
+  }
+  CGF.EmitBranch(ContBlock);
+
+  // Emit code to load the value if it was passed in memory.
+
+  CGF.EmitBlock(InMemBlock);
+  Address MemAddr = EmitX86_64VAArgFromMemory(CGF, VAListAddr, Ty);
+
+  // Return the appropriate result.
+
+  CGF.EmitBlock(ContBlock);
+  Address ResAddr =
+      emitMergePHI(CGF, RegAddr, InRegBlock, MemAddr, InMemBlock, "vaarg.addr");
+  return ResAddr;
+}
+
+Address X86_64ABIInfo::EmitMSVAArg(CodeGenFunction &CGF, Address VAListAddr,
+                                   QualType Ty) const {
+  // MS x64 ABI requirement: "Any argument that doesn't fit in 8 bytes, or is
+  // not 1, 2, 4, or 8 bytes, must be passed by reference."
+  uint64_t Width = getContext().getTypeSize(Ty);
+  bool IsIndirect = Width > 64 || !llvm::isPowerOf2_64(Width);
+
+  return emitVoidPtrVAArg(CGF, VAListAddr, Ty, IsIndirect,
+                          CGF.getContext().getTypeInfoInChars(Ty),
+                          CharUnits::fromQuantity(8),
+                          /*allowHigherAlign*/ false);
+}
+
+ABIArgInfo WinX86_64ABIInfo::reclassifyHvaArgForVectorCall(
+    QualType Ty, unsigned &FreeSSERegs, const ABIArgInfo &current) const {
+  const Type *Base = nullptr;
+  uint64_t NumElts = 0;
+
+  if (!Ty->isBuiltinType() && !Ty->isVectorType() &&
+      isHomogeneousAggregate(Ty, Base, NumElts) && FreeSSERegs >= NumElts) {
+    FreeSSERegs -= NumElts;
+    return getDirectX86Hva();
+  }
+  return current;
+}
+
+ABIArgInfo WinX86_64ABIInfo::classify(QualType Ty, unsigned &FreeSSERegs,
+                                      bool IsReturnType, bool IsVectorCall,
+                                      bool IsRegCall) const {
+
+  if (Ty->isVoidType())
+    return ABIArgInfo::getIgnore();
+
+  if (const EnumType *EnumTy = Ty->getAs<EnumType>())
+    Ty = EnumTy->getDecl()->getIntegerType();
+
+  TypeInfo Info = getContext().getTypeInfo(Ty);
+  uint64_t Width = Info.Width;
+  CharUnits Align = getContext().toCharUnitsFromBits(Info.Align);
+
+  const RecordType *RT = Ty->getAs<RecordType>();
+  if (RT) {
+    if (!IsReturnType) {
+      if (CGCXXABI::RecordArgABI RAA = getRecordArgABI(RT, getCXXABI()))
+        return getNaturalAlignIndirect(Ty, RAA == CGCXXABI::RAA_DirectInMemory);
+    }
+
+    if (RT->getDecl()->hasFlexibleArrayMember())
+      return getNaturalAlignIndirect(Ty, /*ByVal=*/false);
+  }
+
+  const Type *Base = nullptr;
+  uint64_t NumElts = 0;
+  // vectorcall adds the concept of a homogenous vector aggregate, similar to
+  // other targets.
+  if ((IsVectorCall || IsRegCall) &&
+      isHomogeneousAggregate(Ty, Base, NumElts)) {
+    if (IsRegCall) {
+      if (FreeSSERegs >= NumElts) {
+        FreeSSERegs -= NumElts;
+        if (IsReturnType || Ty->isBuiltinType() || Ty->isVectorType())
+          return ABIArgInfo::getDirect();
+        return ABIArgInfo::getExpand();
+      }
+      return ABIArgInfo::getIndirect(Align, /*ByVal=*/false);
+    } else if (IsVectorCall) {
+      if (FreeSSERegs >= NumElts &&
+          (IsReturnType || Ty->isBuiltinType() || Ty->isVectorType())) {
+        FreeSSERegs -= NumElts;
+        return ABIArgInfo::getDirect();
+      } else if (IsReturnType) {
+        return ABIArgInfo::getExpand();
+      } else if (!Ty->isBuiltinType() && !Ty->isVectorType()) {
+        // HVAs are delayed and reclassified in the 2nd step.
+        return ABIArgInfo::getIndirect(Align, /*ByVal=*/false);
+      }
+    }
+  }
+
+  if (Ty->isMemberPointerType()) {
+    // If the member pointer is represented by an LLVM int or ptr, pass it
+    // directly.
+    llvm::Type *LLTy = CGT.ConvertType(Ty);
+    if (LLTy->isPointerTy() || LLTy->isIntegerTy())
+      return ABIArgInfo::getDirect();
+  }
+
+  if (RT || Ty->isAnyComplexType() || Ty->isMemberPointerType()) {
+    // MS x64 ABI requirement: "Any argument that doesn't fit in 8 bytes, or is
+    // not 1, 2, 4, or 8 bytes, must be passed by reference."
+    if (Width > 64 || !llvm::isPowerOf2_64(Width))
+      return getNaturalAlignIndirect(Ty, /*ByVal=*/false);
+
+    // Otherwise, coerce it to a small integer.
+    return ABIArgInfo::getDirect(llvm::IntegerType::get(getVMContext(), Width));
+  }
+
+  if (const BuiltinType *BT = Ty->getAs<BuiltinType>()) {
+    switch (BT->getKind()) {
+    case BuiltinType::Bool:
+      // Bool type is always extended to the ABI, other builtin types are not
+      // extended.
+      return ABIArgInfo::getExtend(Ty);
+
+    case BuiltinType::LongDouble:
+      // Mingw64 GCC uses the old 80 bit extended precision floating point
+      // unit. It passes them indirectly through memory.
+      if (IsMingw64) {
+        const llvm::fltSemantics *LDF = &getTarget().getLongDoubleFormat();
+        if (LDF == &llvm::APFloat::x87DoubleExtended())
+          return ABIArgInfo::getIndirect(Align, /*ByVal=*/false);
+      }
+      break;
+
+    case BuiltinType::Int128:
+    case BuiltinType::UInt128:
+      // If it's a parameter type, the normal ABI rule is that arguments larger
+      // than 8 bytes are passed indirectly. GCC follows it. We follow it too,
+      // even though it isn't particularly efficient.
+      if (!IsReturnType)
+        return ABIArgInfo::getIndirect(Align, /*ByVal=*/false);
+
+      // Mingw64 GCC returns i128 in XMM0. Coerce to v2i64 to handle that.
+      // Clang matches them for compatibility.
+      return ABIArgInfo::getDirect(llvm::FixedVectorType::get(
+          llvm::Type::getInt64Ty(getVMContext()), 2));
+
+    default:
+      break;
+    }
+  }
+
+  if (Ty->isBitIntType()) {
+    // MS x64 ABI requirement: "Any argument that doesn't fit in 8 bytes, or is
+    // not 1, 2, 4, or 8 bytes, must be passed by reference."
+    // However, non-power-of-two bit-precise integers will be passed as 1, 2, 4,
+    // or 8 bytes anyway as long is it fits in them, so we don't have to check
+    // the power of 2.
+    if (Width <= 64)
+      return ABIArgInfo::getDirect();
+    return ABIArgInfo::getIndirect(Align, /*ByVal=*/false);
+  }
+
+  return ABIArgInfo::getDirect();
+}
+
+void WinX86_64ABIInfo::computeInfo(CGFunctionInfo &FI) const {
+  const unsigned CC = FI.getCallingConvention();
+  bool IsVectorCall = CC == llvm::CallingConv::X86_VectorCall;
+  bool IsRegCall = CC == llvm::CallingConv::X86_RegCall;
+
+  // If __attribute__((sysv_abi)) is in use, use the SysV argument
+  // classification rules.
+  if (CC == llvm::CallingConv::X86_64_SysV) {
+    X86_64ABIInfo SysVABIInfo(CGT, AVXLevel);
+    SysVABIInfo.computeInfo(FI);
+    return;
+  }
+
+  unsigned FreeSSERegs = 0;
+  if (IsVectorCall) {
+    // We can use up to 4 SSE return registers with vectorcall.
+    FreeSSERegs = 4;
+  } else if (IsRegCall) {
+    // RegCall gives us 16 SSE registers.
+    FreeSSERegs = 16;
+  }
+
+  if (!getCXXABI().classifyReturnType(FI))
+    FI.getReturnInfo() = classify(FI.getReturnType(), FreeSSERegs, true,
+                                  IsVectorCall, IsRegCall);
+
+  if (IsVectorCall) {
+    // We can use up to 6 SSE register parameters with vectorcall.
+    FreeSSERegs = 6;
+  } else if (IsRegCall) {
+    // RegCall gives us 16 SSE registers, we can reuse the return registers.
+    FreeSSERegs = 16;
+  }
+
+  unsigned ArgNum = 0;
+  unsigned ZeroSSERegs = 0;
+  for (auto &I : FI.arguments()) {
+    // Vectorcall in x64 only permits the first 6 arguments to be passed as
+    // XMM/YMM registers. After the sixth argument, pretend no vector
+    // registers are left.
+    unsigned *MaybeFreeSSERegs =
+        (IsVectorCall && ArgNum >= 6) ? &ZeroSSERegs : &FreeSSERegs;
+    I.info =
+        classify(I.type, *MaybeFreeSSERegs, false, IsVectorCall, IsRegCall);
+    ++ArgNum;
+  }
+
+  if (IsVectorCall) {
+    // For vectorcall, assign aggregate HVAs to any free vector registers in a
+    // second pass.
+    for (auto &I : FI.arguments())
+      I.info = reclassifyHvaArgForVectorCall(I.type, FreeSSERegs, I.info);
+  }
+}
+
+Address WinX86_64ABIInfo::EmitVAArg(CodeGenFunction &CGF, Address VAListAddr,
+                                    QualType Ty) const {
+  // MS x64 ABI requirement: "Any argument that doesn't fit in 8 bytes, or is
+  // not 1, 2, 4, or 8 bytes, must be passed by reference."
+  uint64_t Width = getContext().getTypeSize(Ty);
+  bool IsIndirect = Width > 64 || !llvm::isPowerOf2_64(Width);
+
+  return emitVoidPtrVAArg(CGF, VAListAddr, Ty, IsIndirect,
+                          CGF.getContext().getTypeInfoInChars(Ty),
+                          CharUnits::fromQuantity(8),
+                          /*allowHigherAlign*/ false);
+}

clang/lib/CodeGen/Targets/XCore.h

+//===- XCore.h --------------------------------------------------*- C++ -*-===//
+//
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
+//
+//===----------------------------------------------------------------------===//
+
+#ifndef LLVM_CLANG_LIB_CODEGEN_TARGETS_XCORE_H
+#define LLVM_CLANG_LIB_CODEGEN_TARGETS_XCORE_H
+
+#include "TargetInfo.h"
+
+namespace clang::CodeGen {
+
+namespace xcore {
+/// A SmallStringEnc instance is used to build up the TypeString by passing
+/// it by reference between functions that append to it.
+typedef llvm::SmallString<128> SmallStringEnc;
+
+/// TypeStringCache caches the meta encodings of Types.
+///
+/// The reason for caching TypeStrings is two fold:
+///   1. To cache a type's encoding for later uses;
+///   2. As a means to break recursive member type inclusion.
+///
+/// A cache Entry can have a Status of:
+///   NonRecursive:   The type encoding is not recursive;
+///   Recursive:      The type encoding is recursive;
+///   Incomplete:     An incomplete TypeString;
+///   IncompleteUsed: An incomplete TypeString that has been used in a
+///                   Recursive type encoding.
+///
+/// A NonRecursive entry will have all of its sub-members expanded as fully
+/// as possible. Whilst it may contain types which are recursive, the type
+/// itself is not recursive and thus its encoding may be safely used whenever
+/// the type is encountered.
+///
+/// A Recursive entry will have all of its sub-members expanded as fully as
+/// possible. The type itself is recursive and it may contain other types which
+/// are recursive. The Recursive encoding must not be used during the expansion
+/// of a recursive type's recursive branch. For simplicity the code uses
+/// IncompleteCount to reject all usage of Recursive encodings for member types.
+///
+/// An Incomplete entry is always a RecordType and only encodes its
+/// identifier e.g. "s(S){}". Incomplete 'StubEnc' entries are ephemeral and
+/// are placed into the cache during type expansion as a means to identify and
+/// handle recursive inclusion of types as sub-members. If there is recursion
+/// the entry becomes IncompleteUsed.
+///
+/// During the expansion of a RecordType's members:
+///
+///   If the cache contains a NonRecursive encoding for the member type, the
+///   cached encoding is used;
+///
+///   If the cache contains a Recursive encoding for the member type, the
+///   cached encoding is 'Swapped' out, as it may be incorrect, and...
+///
+///   If the member is a RecordType, an Incomplete encoding is placed into the
+///   cache to break potential recursive inclusion of itself as a sub-member;
+///
+///   Once a member RecordType has been expanded, its temporary incomplete
+///   entry is removed from the cache. If a Recursive encoding was swapped out
+///   it is swapped back in;
+///
+///   If an incomplete entry is used to expand a sub-member, the incomplete
+///   entry is marked as IncompleteUsed. The cache keeps count of how many
+///   IncompleteUsed entries it currently contains in IncompleteUsedCount;
+///
+///   If a member's encoding is found to be a NonRecursive or Recursive viz:
+///   IncompleteUsedCount==0, the member's encoding is added to the cache.
+///   Else the member is part of a recursive type and thus the recursion has
+///   been exited too soon for the encoding to be correct for the member.
+///
+class LLVM_LIBRARY_VISIBILITY TypeStringCache {
+  enum Status { NonRecursive, Recursive, Incomplete, IncompleteUsed };
+  struct Entry {
+    std::string Str;     // The encoded TypeString for the type.
+    enum Status State;   // Information about the encoding in 'Str'.
+    std::string Swapped; // A temporary place holder for a Recursive encoding
+                         // during the expansion of RecordType's members.
+  };
+  std::map<const IdentifierInfo *, struct Entry> Map;
+  unsigned IncompleteCount;     // Number of Incomplete entries in the Map.
+  unsigned IncompleteUsedCount; // Number of IncompleteUsed entries in the Map.
+public:
+  TypeStringCache() : IncompleteCount(0), IncompleteUsedCount(0) {}
+  void addIncomplete(const IdentifierInfo *ID, std::string StubEnc);
+  bool removeIncomplete(const IdentifierInfo *ID);
+  void addIfComplete(const IdentifierInfo *ID, StringRef Str, bool IsRecursive);
+  StringRef lookupStr(const IdentifierInfo *ID);
+};
+} // namespace xcore
+
+class LLVM_LIBRARY_VISIBILITY XCoreTargetCodeGenInfo
+    : public TargetCodeGenInfo {
+  mutable xcore::TypeStringCache TSC;
+  void emitTargetMD(const Decl *D, llvm::GlobalValue *GV,
+                    const CodeGen::CodeGenModule &M) const;
+
+public:
+  XCoreTargetCodeGenInfo(CodeGenTypes &CGT);
+  void emitTargetMetadata(CodeGen::CodeGenModule &CGM,
+                          const llvm::MapVector<GlobalDecl, StringRef>
+                              &MangledDeclNames) const override;
+};
+
+} // namespace clang::CodeGen
+
+#endif // LLVM_CLANG_LIB_CODEGEN_TARGETS_XCORE_H

clang/lib/CodeGen/Targets/XCore.cpp

+//===- XCore.cpp ----------------------------------------------------------===//
+//
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
+//
+//===----------------------------------------------------------------------===//
+
+#include "XCore.h"
+#include "ABIInfoImpl.h"
+
+using namespace clang;
+using namespace clang::CodeGen;
+using namespace clang::CodeGen::xcore;
+
+//===----------------------------------------------------------------------===//
+// XCore ABI Implementation
+//===----------------------------------------------------------------------===//
+
+namespace {
+
+/// TypeString encodings for enum & union fields must be order.
+/// FieldEncoding is a helper for this ordering process.
+class FieldEncoding {
+  bool HasName;
+  std::string Enc;
+
+public:
+  FieldEncoding(bool b, SmallStringEnc &e) : HasName(b), Enc(e.c_str()) {}
+  StringRef str() { return Enc; }
+  bool operator<(const FieldEncoding &rhs) const {
+    if (HasName != rhs.HasName)
+      return HasName;
+    return Enc < rhs.Enc;
+  }
+};
+
+class XCoreABIInfo : public DefaultABIInfo {
+public:
+  XCoreABIInfo(CodeGen::CodeGenTypes &CGT) : DefaultABIInfo(CGT) {}
+  Address EmitVAArg(CodeGenFunction &CGF, Address VAListAddr,
+                    QualType Ty) const override;
+};
+
+} // End anonymous namespace.
+
+// TODO: this implementation is likely now redundant with the default
+// EmitVAArg.
+Address XCoreABIInfo::EmitVAArg(CodeGenFunction &CGF, Address VAListAddr,
+                                QualType Ty) const {
+  CGBuilderTy &Builder = CGF.Builder;
+
+  // Get the VAList.
+  CharUnits SlotSize = CharUnits::fromQuantity(4);
+  Address AP = Address(Builder.CreateLoad(VAListAddr),
+                       getVAListElementType(CGF), SlotSize);
+
+  // Handle the argument.
+  ABIArgInfo AI = classifyArgumentType(Ty);
+  CharUnits TypeAlign = getContext().getTypeAlignInChars(Ty);
+  llvm::Type *ArgTy = CGT.ConvertType(Ty);
+  if (AI.canHaveCoerceToType() && !AI.getCoerceToType())
+    AI.setCoerceToType(ArgTy);
+  llvm::Type *ArgPtrTy = llvm::PointerType::getUnqual(ArgTy);
+
+  Address Val = Address::invalid();
+  CharUnits ArgSize = CharUnits::Zero();
+  switch (AI.getKind()) {
+  case ABIArgInfo::Expand:
+  case ABIArgInfo::CoerceAndExpand:
+  case ABIArgInfo::InAlloca:
+    llvm_unreachable("Unsupported ABI kind for va_arg");
+  case ABIArgInfo::Ignore:
+    Val = Address(llvm::UndefValue::get(ArgPtrTy), ArgTy, TypeAlign);
+    ArgSize = CharUnits::Zero();
+    break;
+  case ABIArgInfo::Extend:
+  case ABIArgInfo::Direct:
+    Val = Builder.CreateElementBitCast(AP, ArgTy);
+    ArgSize = CharUnits::fromQuantity(
+        getDataLayout().getTypeAllocSize(AI.getCoerceToType()));
+    ArgSize = ArgSize.alignTo(SlotSize);
+    break;
+  case ABIArgInfo::Indirect:
+  case ABIArgInfo::IndirectAliased:
+    Val = Builder.CreateElementBitCast(AP, ArgPtrTy);
+    Val = Address(Builder.CreateLoad(Val), ArgTy, TypeAlign);
+    ArgSize = SlotSize;
+    break;
+  }
+
+  // Increment the VAList.
+  if (!ArgSize.isZero()) {
+    Address APN = Builder.CreateConstInBoundsByteGEP(AP, ArgSize);
+    Builder.CreateStore(APN.getPointer(), VAListAddr);
+  }
+
+  return Val;
+}
+
+/// During the expansion of a RecordType, an incomplete TypeString is placed
+/// into the cache as a means to identify and break recursion.
+/// If there is a Recursive encoding in the cache, it is swapped out and will
+/// be reinserted by removeIncomplete().
+/// All other types of encoding should have been used rather than arriving here.
+void TypeStringCache::addIncomplete(const IdentifierInfo *ID,
+                                    std::string StubEnc) {
+  if (!ID)
+    return;
+  Entry &E = Map[ID];
+  assert((E.Str.empty() || E.State == Recursive) &&
+         "Incorrectly use of addIncomplete");
+  assert(!StubEnc.empty() && "Passing an empty string to addIncomplete()");
+  E.Swapped.swap(E.Str); // swap out the Recursive
+  E.Str.swap(StubEnc);
+  E.State = Incomplete;
+  ++IncompleteCount;
+}
+
+/// Once the RecordType has been expanded, the temporary incomplete TypeString
+/// must be removed from the cache.
+/// If a Recursive was swapped out by addIncomplete(), it will be replaced.
+/// Returns true if the RecordType was defined recursively.
+bool TypeStringCache::removeIncomplete(const IdentifierInfo *ID) {
+  if (!ID)
+    return false;
+  auto I = Map.find(ID);
+  assert(I != Map.end() && "Entry not present");
+  Entry &E = I->second;
+  assert((E.State == Incomplete || E.State == IncompleteUsed) &&
+         "Entry must be an incomplete type");
+  bool IsRecursive = false;
+  if (E.State == IncompleteUsed) {
+    // We made use of our Incomplete encoding, thus we are recursive.
+    IsRecursive = true;
+    --IncompleteUsedCount;
+  }
+  if (E.Swapped.empty())
+    Map.erase(I);
+  else {
+    // Swap the Recursive back.
+    E.Swapped.swap(E.Str);
+    E.Swapped.clear();
+    E.State = Recursive;
+  }
+  --IncompleteCount;
+  return IsRecursive;
+}
+
+/// Add the encoded TypeString to the cache only if it is NonRecursive or
+/// Recursive (viz: all sub-members were expanded as fully as possible).
+void TypeStringCache::addIfComplete(const IdentifierInfo *ID, StringRef Str,
+                                    bool IsRecursive) {
+  if (!ID || IncompleteUsedCount)
+    return; // No key or it is an incomplete sub-type so don't add.
+  Entry &E = Map[ID];
+  if (IsRecursive && !E.Str.empty()) {
+    assert(E.State == Recursive && E.Str.size() == Str.size() &&
+           "This is not the same Recursive entry");
+    // The parent container was not recursive after all, so we could have used
+    // this Recursive sub-member entry after all, but we assumed the worse when
+    // we started viz: IncompleteCount!=0.
+    return;
+  }
+  assert(E.Str.empty() && "Entry already present");
+  E.Str = Str.str();
+  E.State = IsRecursive ? Recursive : NonRecursive;
+}
+
+/// Return a cached TypeString encoding for the ID. If there isn't one, or we
+/// are recursively expanding a type (IncompleteCount != 0) and the cached
+/// encoding is Recursive, return an empty StringRef.
+StringRef TypeStringCache::lookupStr(const IdentifierInfo *ID) {
+  if (!ID)
+    return StringRef(); // We have no key.
+  auto I = Map.find(ID);
+  if (I == Map.end())
+    return StringRef(); // We have no encoding.
+  Entry &E = I->second;
+  if (E.State == Recursive && IncompleteCount)
+    return StringRef(); // We don't use Recursive encodings for member types.
+
+  if (E.State == Incomplete) {
+    // The incomplete type is being used to break out of recursion.
+    E.State = IncompleteUsed;
+    ++IncompleteUsedCount;
+  }
+  return E.Str;
+}
+
+static bool appendType(SmallStringEnc &Enc, QualType QType,
+                       const CodeGen::CodeGenModule &CGM, TypeStringCache &TSC);
+
+/// Helper function for appendRecordType().
+/// Builds a SmallVector containing the encoded field types in declaration
+/// order.
+static bool extractFieldType(SmallVectorImpl<FieldEncoding> &FE,
+                             const RecordDecl *RD,
+                             const CodeGen::CodeGenModule &CGM,
+                             TypeStringCache &TSC) {
+  for (const auto *Field : RD->fields()) {
+    SmallStringEnc Enc;
+    Enc += "m(";
+    Enc += Field->getName();
+    Enc += "){";
+    if (Field->isBitField()) {
+      Enc += "b(";
+      llvm::raw_svector_ostream OS(Enc);
+      OS << Field->getBitWidthValue(CGM.getContext());
+      Enc += ':';
+    }
+    if (!appendType(Enc, Field->getType(), CGM, TSC))
+      return false;
+    if (Field->isBitField())
+      Enc += ')';
+    Enc += '}';
+    FE.emplace_back(!Field->getName().empty(), Enc);
+  }
+  return true;
+}
+
+/// Appends structure and union types to Enc and adds encoding to cache.
+/// Recursively calls appendType (via extractFieldType) for each field.
+/// Union types have their fields ordered according to the ABI.
+static bool appendRecordType(SmallStringEnc &Enc, const RecordType *RT,
+                             const CodeGen::CodeGenModule &CGM,
+                             TypeStringCache &TSC, const IdentifierInfo *ID) {
+  // Append the cached TypeString if we have one.
+  StringRef TypeString = TSC.lookupStr(ID);
+  if (!TypeString.empty()) {
+    Enc += TypeString;
+    return true;
+  }
+
+  // Start to emit an incomplete TypeString.
+  size_t Start = Enc.size();
+  Enc += (RT->isUnionType() ? 'u' : 's');
+  Enc += '(';
+  if (ID)
+    Enc += ID->getName();
+  Enc += "){";
+
+  // We collect all encoded fields and order as necessary.
+  bool IsRecursive = false;
+  const RecordDecl *RD = RT->getDecl()->getDefinition();
+  if (RD && !RD->field_empty()) {
+    // An incomplete TypeString stub is placed in the cache for this RecordType
+    // so that recursive calls to this RecordType will use it whilst building a
+    // complete TypeString for this RecordType.
+    SmallVector<FieldEncoding, 16> FE;
+    std::string StubEnc(Enc.substr(Start).str());
+    StubEnc += '}'; // StubEnc now holds a valid incomplete TypeString.
+    TSC.addIncomplete(ID, std::move(StubEnc));
+    if (!extractFieldType(FE, RD, CGM, TSC)) {
+      (void)TSC.removeIncomplete(ID);
+      return false;
+    }
+    IsRecursive = TSC.removeIncomplete(ID);
+    // The ABI requires unions to be sorted but not structures.
+    // See FieldEncoding::operator< for sort algorithm.
+    if (RT->isUnionType())
+      llvm::sort(FE);
+    // We can now complete the TypeString.
+    unsigned E = FE.size();
+    for (unsigned I = 0; I != E; ++I) {
+      if (I)
+        Enc += ',';
+      Enc += FE[I].str();
+    }
+  }
+  Enc += '}';
+  TSC.addIfComplete(ID, Enc.substr(Start), IsRecursive);
+  return true;
+}
+
+/// Appends enum types to Enc and adds the encoding to the cache.
+static bool appendEnumType(SmallStringEnc &Enc, const EnumType *ET,
+                           TypeStringCache &TSC, const IdentifierInfo *ID) {
+  // Append the cached TypeString if we have one.
+  StringRef TypeString = TSC.lookupStr(ID);
+  if (!TypeString.empty()) {
+    Enc += TypeString;
+    return true;
+  }
+
+  size_t Start = Enc.size();
+  Enc += "e(";
+  if (ID)
+    Enc += ID->getName();
+  Enc += "){";
+
+  // We collect all encoded enumerations and order them alphanumerically.
+  if (const EnumDecl *ED = ET->getDecl()->getDefinition()) {
+    SmallVector<FieldEncoding, 16> FE;
+    for (auto I = ED->enumerator_begin(), E = ED->enumerator_end(); I != E;
+         ++I) {
+      SmallStringEnc EnumEnc;
+      EnumEnc += "m(";
+      EnumEnc += I->getName();
+      EnumEnc += "){";
+      I->getInitVal().toString(EnumEnc);
+      EnumEnc += '}';
+      FE.push_back(FieldEncoding(!I->getName().empty(), EnumEnc));
+    }
+    llvm::sort(FE);
+    unsigned E = FE.size();
+    for (unsigned I = 0; I != E; ++I) {
+      if (I)
+        Enc += ',';
+      Enc += FE[I].str();
+    }
+  }
+  Enc += '}';
+  TSC.addIfComplete(ID, Enc.substr(Start), false);
+  return true;
+}
+
+/// Appends type's qualifier to Enc.
+/// This is done prior to appending the type's encoding.
+static void appendQualifier(SmallStringEnc &Enc, QualType QT) {
+  // Qualifiers are emitted in alphabetical order.
+  static const char *const Table[] = {
+      "", "c:", "r:", "cr:", "v:", "cv:", "rv:", "crv:"};
+  int Lookup = 0;
+  if (QT.isConstQualified())
+    Lookup += 1 << 0;
+  if (QT.isRestrictQualified())
+    Lookup += 1 << 1;
+  if (QT.isVolatileQualified())
+    Lookup += 1 << 2;
+  Enc += Table[Lookup];
+}
+
+/// Appends built-in types to Enc.
+static bool appendBuiltinType(SmallStringEnc &Enc, const BuiltinType *BT) {
+  const char *EncType;
+  switch (BT->getKind()) {
+  case BuiltinType::Void:
+    EncType = "0";
+    break;
+  case BuiltinType::Bool:
+    EncType = "b";
+    break;
+  case BuiltinType::Char_U:
+    EncType = "uc";
+    break;
+  case BuiltinType::UChar:
+    EncType = "uc";
+    break;
+  case BuiltinType::SChar:
+    EncType = "sc";
+    break;
+  case BuiltinType::UShort:
+    EncType = "us";
+    break;
+  case BuiltinType::Short:
+    EncType = "ss";
+    break;
+  case BuiltinType::UInt:
+    EncType = "ui";
+    break;
+  case BuiltinType::Int:
+    EncType = "si";
+    break;
+  case BuiltinType::ULong:
+    EncType = "ul";
+    break;
+  case BuiltinType::Long:
+    EncType = "sl";
+    break;
+  case BuiltinType::ULongLong:
+    EncType = "ull";
+    break;
+  case BuiltinType::LongLong:
+    EncType = "sll";
+    break;
+  case BuiltinType::Float:
+    EncType = "ft";
+    break;
+  case BuiltinType::Double:
+    EncType = "d";
+    break;
+  case BuiltinType::LongDouble:
+    EncType = "ld";
+    break;
+  default:
+    return false;
+  }
+  Enc += EncType;
+  return true;
+}
+
+/// Appends a pointer encoding to Enc before calling appendType for the pointee.
+static bool appendPointerType(SmallStringEnc &Enc, const PointerType *PT,
+                              const CodeGen::CodeGenModule &CGM,
+                              TypeStringCache &TSC) {
+  Enc += "p(";
+  if (!appendType(Enc, PT->getPointeeType(), CGM, TSC))
+    return false;
+  Enc += ')';
+  return true;
+}
+
+/// Appends array encoding to Enc before calling appendType for the element.
+static bool appendArrayType(SmallStringEnc &Enc, QualType QT,
+                            const ArrayType *AT,
+                            const CodeGen::CodeGenModule &CGM,
+                            TypeStringCache &TSC, StringRef NoSizeEnc) {
+  if (AT->getSizeModifier() != ArrayType::Normal)
+    return false;
+  Enc += "a(";
+  if (const ConstantArrayType *CAT = dyn_cast<ConstantArrayType>(AT))
+    CAT->getSize().toStringUnsigned(Enc);
+  else
+    Enc += NoSizeEnc; // Global arrays use "*", otherwise it is "".
+  Enc += ':';
+  // The Qualifiers should be attached to the type rather than the array.
+  appendQualifier(Enc, QT);
+  if (!appendType(Enc, AT->getElementType(), CGM, TSC))
+    return false;
+  Enc += ')';
+  return true;
+}
+
+/// Appends a function encoding to Enc, calling appendType for the return type
+/// and the arguments.
+static bool appendFunctionType(SmallStringEnc &Enc, const FunctionType *FT,
+                               const CodeGen::CodeGenModule &CGM,
+                               TypeStringCache &TSC) {
+  Enc += "f{";
+  if (!appendType(Enc, FT->getReturnType(), CGM, TSC))
+    return false;
+  Enc += "}(";
+  if (const FunctionProtoType *FPT = FT->getAs<FunctionProtoType>()) {
+    // N.B. we are only interested in the adjusted param types.
+    auto I = FPT->param_type_begin();
+    auto E = FPT->param_type_end();
+    if (I != E) {
+      do {
+        if (!appendType(Enc, *I, CGM, TSC))
+          return false;
+        ++I;
+        if (I != E)
+          Enc += ',';
+      } while (I != E);
+      if (FPT->isVariadic())
+        Enc += ",va";
+    } else {
+      if (FPT->isVariadic())
+        Enc += "va";
+      else
+        Enc += '0';
+    }
+  }
+  Enc += ')';
+  return true;
+}
+
+/// Handles the type's qualifier before dispatching a call to handle specific
+/// type encodings.
+static bool appendType(SmallStringEnc &Enc, QualType QType,
+                       const CodeGen::CodeGenModule &CGM,
+                       TypeStringCache &TSC) {
+
+  QualType QT = QType.getCanonicalType();
+
+  if (const ArrayType *AT = QT->getAsArrayTypeUnsafe())
+    // The Qualifiers should be attached to the type rather than the array.
+    // Thus we don't call appendQualifier() here.
+    return appendArrayType(Enc, QT, AT, CGM, TSC, "");
+
+  appendQualifier(Enc, QT);
+
+  if (const BuiltinType *BT = QT->getAs<BuiltinType>())
+    return appendBuiltinType(Enc, BT);
+
+  if (const PointerType *PT = QT->getAs<PointerType>())
+    return appendPointerType(Enc, PT, CGM, TSC);
+
+  if (const EnumType *ET = QT->getAs<EnumType>())
+    return appendEnumType(Enc, ET, TSC, QT.getBaseTypeIdentifier());
+
+  if (const RecordType *RT = QT->getAsStructureType())
+    return appendRecordType(Enc, RT, CGM, TSC, QT.getBaseTypeIdentifier());
+
+  if (const RecordType *RT = QT->getAsUnionType())
+    return appendRecordType(Enc, RT, CGM, TSC, QT.getBaseTypeIdentifier());
+
+  if (const FunctionType *FT = QT->getAs<FunctionType>())
+    return appendFunctionType(Enc, FT, CGM, TSC);
+
+  return false;
+}
+
+/// The XCore ABI includes a type information section that communicates symbol
+/// type information to the linker. The linker uses this information to verify
+/// safety/correctness of things such as array bound and pointers et al.
+/// The ABI only requires C (and XC) language modules to emit TypeStrings.
+/// This type information (TypeString) is emitted into meta data for all global
+/// symbols: definitions, declarations, functions & variables.
+///
+/// The TypeString carries type, qualifier, name, size & value details.
+/// Please see 'Tools Development Guide' section 2.16.2 for format details:
+/// https://www.xmos.com/download/public/Tools-Development-Guide%28X9114A%29.pdf
+/// The output is tested by test/CodeGen/xcore-stringtype.c.
+///
+static bool getTypeString(SmallStringEnc &Enc, const Decl *D,
+                          const CodeGen::CodeGenModule &CGM,
+                          TypeStringCache &TSC) {
+  if (!D)
+    return false;
+
+  if (const FunctionDecl *FD = dyn_cast<FunctionDecl>(D)) {
+    if (FD->getLanguageLinkage() != CLanguageLinkage)
+      return false;
+    return appendType(Enc, FD->getType(), CGM, TSC);
+  }
+
+  if (const VarDecl *VD = dyn_cast<VarDecl>(D)) {
+    if (VD->getLanguageLinkage() != CLanguageLinkage)
+      return false;
+    QualType QT = VD->getType().getCanonicalType();
+    if (const ArrayType *AT = QT->getAsArrayTypeUnsafe()) {
+      // Global ArrayTypes are given a size of '*' if the size is unknown.
+      // The Qualifiers should be attached to the type rather than the array.
+      // Thus we don't call appendQualifier() here.
+      return appendArrayType(Enc, QT, AT, CGM, TSC, "*");
+    }
+    return appendType(Enc, QT, CGM, TSC);
+  }
+  return false;
+}
+
+XCoreTargetCodeGenInfo::XCoreTargetCodeGenInfo(CodeGenTypes &CGT)
+    : TargetCodeGenInfo(std::make_unique<XCoreABIInfo>(CGT)) {}
+
+/// XCore uses emitTargetMD to emit TypeString metadata for global symbols.
+void XCoreTargetCodeGenInfo::emitTargetMD(
+    const Decl *D, llvm::GlobalValue *GV,
+    const CodeGen::CodeGenModule &CGM) const {
+  SmallStringEnc Enc;
+  if (getTypeString(Enc, D, CGM, TSC)) {
+    llvm::LLVMContext &Ctx = CGM.getModule().getContext();
+    llvm::Metadata *MDVals[] = {llvm::ConstantAsMetadata::get(GV),
+                                llvm::MDString::get(Ctx, Enc.str())};
+    llvm::NamedMDNode *MD =
+        CGM.getModule().getOrInsertNamedMetadata("xcore.typestrings");
+    MD->addOperand(llvm::MDNode::get(Ctx, MDVals));
+  }
+}
+
+void XCoreTargetCodeGenInfo::emitTargetMetadata(
+    CodeGen::CodeGenModule &CGM,
+    const llvm::MapVector<GlobalDecl, StringRef> &MangledDeclNames) const {
+  // Warning, new MangledDeclNames may be appended within this loop.
+  // We rely on MapVector insertions adding new elements to the end
+  // of the container.
+  for (unsigned I = 0; I != MangledDeclNames.size(); ++I) {
+    auto Val = *(MangledDeclNames.begin() + I);
+    llvm::GlobalValue *GV = CGM.GetGlobalValue(Val.second);
+    if (GV) {
+      const Decl *D = Val.first.getDecl()->getMostRecentDecl();
+      emitTargetMD(D, GV, CGM);
+    }
+  }
+}

llvm/utils/gn/secondary/clang/lib/CodeGen/BUILD.gn

sources = [
     "MacroPPCallbacks.cpp",
     "MicrosoftCXXABI.cpp",
     "ModuleBuilder.cpp",
     "ObjectFilePCHContainerOperations.cpp",
     "PatternInit.cpp",
     "SanitizerMetadata.cpp",
     "SwiftCallingConv.cpp",
     "TargetInfo.cpp",
+    "Targets/AArch64.cpp",
+    "Targets/AMDGPU.cpp",
+    "Targets/ARC.cpp",
+    "Targets/ARM.cpp",
+    "Targets/AVR.cpp",
+    "Targets/BPF.cpp",
+    "Targets/CSKY.cpp",
+    "Targets/Hexagon.cpp",
+    "Targets/Lanai.cpp",
+    "Targets/LoongArch.cpp",
+    "Targets/M68k.cpp",
+    "Targets/MSP430.cpp",
+    "Targets/Mips.cpp",
+    "Targets/NVPTX.cpp",
+    "Targets/PNaCl.cpp",
+    "Targets/PPC.cpp",
+    "Targets/RISCV.cpp",
+    "Targets/SPIR.cpp",
+    "Targets/Sparc.cpp",
+    "Targets/SystemZ.cpp",
+    "Targets/TCE.cpp",
+    "Targets/VE.cpp",
+    "Targets/WebAssembly.cpp",
+    "Targets/X86.cpp",
+    "Targets/XCore.cpp",
     "VarBypassDetector.cpp",
   ]
 }