[Clang][OpenMP][OMPBuilder] Moving OMP allocation and cache creation code to OMPBuilderCBHelpers

[fghanim]

Summary

Modified the OMPBuilderCBHelpers in the following ways:

• Moved location of class definition and deleted all constructors
• Moved OpenMP-specific address allocation of local variables
• Moved threadprivate variable creation for the current thread

[jdoerfert]

clang/lib/CodeGen/CGStmtOpenMP.cpp

873

Is this needed?

clang/lib/CodeGen/CodeGenFunction.h

1549

Nit: Make it a doxygen comment with 3x`/, -will` + full stop.

1561

Nit: No need.

1581

What is wrong with BB->getFirstNonPHIOrDbgOrLifetime()? If it is to avoid too many test changes, please add a TODO. I think from a functional perspective there is no need to advance it after the first set of allocas that may be separated from the phis by non-allocas?

[fghanim]

clang/lib/CodeGen/CGStmtOpenMP.cpp

873

All these are changes that I forgot to remove after I created a special version for EmitOMPFirstprivateClause in D79677 for the OMPBuilder

clang/lib/CodeGen/CodeGenFunction.h

1581

Nothing wrong with it. The first while loop, I just came across a case that I don't remember at the moment that had an instruction that wasn't an alloca, and I wanted to skip over that.
the second while, is to get to the first non-alloca instruction. The purpose is to be able to insert new allocas, after already generated allocas.

[fghanim]

updating in response to review comments

[jdoerfert]

Interesting that no tests changed but I guess we just start the move to the IRBUilder.

I think there are two minor comments from before that need to be addressed and the alloca thing, otherwise LGTM.

clang/lib/CodeGen/CodeGenFunction.h

1581

There is no need to do that. It is fine to insert allocas anywhere in the block.

[fghanim]

• rebase
• addressing reviewer's comments

clang/lib/CodeGen/CGDecl.cpp

CodeGenFunction::EmitAutoVarAlloca(const VarDecl &D) {
   if (Ty->isVariablyModifiedType())
     EmitVariablyModifiedType(Ty);
 
   auto *DI = getDebugInfo();
   bool EmitDebugInfo = DI && CGM.getCodeGenOpts().hasReducedDebugInfo();
 
   Address address = Address::invalid();
   Address AllocaAddr = Address::invalid();
-  Address OpenMPLocalAddr =
+  Address OpenMPLocalAddr = Address::invalid();
+  if (CGM.getOpenMPIRBuilder())
+    OpenMPLocalAddr = OMPBuilderCBHelpers::getAddressOfLocalVariable(*this, &D);
+  else
+    OpenMPLocalAddr =
         getLangOpts().OpenMP
             ? CGM.getOpenMPRuntime().getAddressOfLocalVariable(*this, &D)
             : Address::invalid();
+
   bool NRVO = getLangOpts().ElideConstructors && D.isNRVOVariable();
 
   if (getLangOpts().OpenMP && OpenMPLocalAddr.isValid()) {
     address = OpenMPLocalAddr;
   } else if (Ty->isConstantSizeType()) {
     // If this value is an array or struct with a statically determinable
     // constant initializer, there are optimizations we can do.
     //

clang/lib/CodeGen/CGExpr.cpp

EmitBitCastOfLValueToProperType(CodeGenFunction &CGF,
                                 StringRef Name = StringRef()) {
   unsigned AS = cast<llvm::PointerType>(V->getType())->getAddressSpace();
   return CGF.Builder.CreateBitCast(V, IRType->getPointerTo(AS), Name);
 }
 
 static LValue EmitThreadPrivateVarDeclLValue(
     CodeGenFunction &CGF, const VarDecl *VD, QualType T, Address Addr,
     llvm::Type *RealVarTy, SourceLocation Loc) {
-  Addr = CGF.CGM.getOpenMPRuntime().getAddrOfThreadPrivate(CGF, VD, Addr, Loc);
+  if (CGF.CGM.getOpenMPIRBuilder())
+    Addr = CodeGenFunction::OMPBuilderCBHelpers::getAddrOfThreadPrivate(
+        CGF, VD, Addr, Loc);
+  else
+    Addr =
+        CGF.CGM.getOpenMPRuntime().getAddrOfThreadPrivate(CGF, VD, Addr, Loc);
+
   Addr = CGF.Builder.CreateElementBitCast(Addr, RealVarTy);
   return CGF.MakeAddrLValue(Addr, T, AlignmentSource::Decl);
 }
 
 static Address emitDeclTargetVarDeclLValue(CodeGenFunction &CGF,
                                            const VarDecl *VD, QualType T) {
   llvm::Optional<OMPDeclareTargetDeclAttr::MapTypeTy> Res =
       OMPDeclareTargetDeclAttr::isDeclareTargetDeclaration(VD);

clang/lib/CodeGen/CGStmtOpenMP.cpp

 #include "clang/AST/ASTContext.h"
 #include "clang/AST/Attr.h"
 #include "clang/AST/DeclOpenMP.h"
 #include "clang/AST/OpenMPClause.h"
 #include "clang/AST/Stmt.h"
 #include "clang/AST/StmtOpenMP.h"
 #include "clang/Basic/OpenMPKinds.h"
 #include "clang/Basic/PrettyStackTrace.h"
+#include "llvm/Frontend/OpenMP/OMPConstants.h"
 #include "llvm/Frontend/OpenMP/OMPIRBuilder.h"
 #include "llvm/IR/Instructions.h"
 #include "llvm/Support/AtomicOrdering.h"
 using namespace clang;
 using namespace CodeGen;
 using namespace llvm::omp;
 
 namespace {
if (OriginalType->isArrayType()) {
     EmitIgnoredExpr(Copy);
   }
 }
 
 bool CodeGenFunction::EmitOMPFirstprivateClause(const OMPExecutableDirective &D,
                                                 OMPPrivateScope &PrivateScope) {
   if (!HaveInsertPoint())
     return false;
+
   bool DeviceConstTarget =
       getLangOpts().OpenMPIsDevice &&
       isOpenMPTargetExecutionDirective(D.getDirectiveKind());
   bool FirstprivateIsLastprivate = false;
   llvm::DenseMap<const VarDecl *, OpenMPLastprivateModifier> Lastprivates;
   for (const auto *C : D.getClausesOfKind<OMPLastprivateClause>()) {
     for (const auto *D : C->varlists())
       Lastprivates.try_emplace(
for (const Expr *IInit : C->private_copies()) {
         } else {
           Address OriginalAddr = OriginalLVal.getAddress(*this);
           IsRegistered =
               PrivateScope.addPrivate(OrigVD, [this, VDInit, OriginalAddr, VD,
                                                ThisFirstprivateIsLastprivate,
                                                OrigVD, &Lastprivates, IRef]() {
                 // Emit private VarDecl with copy init.
                 // Remap temp VDInit variable to the address of the original
                 // variable (for proper handling of captured global variables).
                 setAddrOfLocalVar(VDInit, OriginalAddr);
                 EmitDecl(*VD);
                 LocalDeclMap.erase(VDInit);
                 if (ThisFirstprivateIsLastprivate &&
                     Lastprivates[OrigVD->getCanonicalDecl()] ==
                         OMPC_LASTPRIVATE_conditional) {
                   // Create/init special variable for lastprivate conditionals.
                   Address VDAddr =
static void emitCommonOMPParallelDirective(
   CGF.CGM.getOpenMPRuntime().emitParallelCall(CGF, S.getBeginLoc(), OutlinedFn,
                                               CapturedVars, IfCond);
 }
 
 static void emitEmptyBoundParameters(CodeGenFunction &,
                                      const OMPExecutableDirective &,
                                      llvm::SmallVectorImpl<llvm::Value *> &) {}
 
+Address CodeGenFunction::OMPBuilderCBHelpers::getAddressOfLocalVariable(
+    CodeGenFunction &CGF, const VarDecl *VD) {
+  CodeGenModule &CGM = CGF.CGM;
+  auto OMPBuilder = CGM.getOpenMPIRBuilder();
+  assert(OMPBuilder && "OMPIRBuilder does not exist!");
+
+  if (!VD)
+    return Address::invalid();
+  const VarDecl *CVD = VD->getCanonicalDecl();
+  if (!CVD->hasAttr<OMPAllocateDeclAttr>())
+    return Address::invalid();
+  const auto *AA = CVD->getAttr<OMPAllocateDeclAttr>();
+  // Use the default allocation.
+  if (AA->getAllocatorType() == OMPAllocateDeclAttr::OMPDefaultMemAlloc &&
+      !AA->getAllocator())
+    return Address::invalid();
+  llvm::Value *Size;
+  CharUnits Align = CGM.getContext().getDeclAlign(CVD);
+  if (CVD->getType()->isVariablyModifiedType()) {
+    Size = CGF.getTypeSize(CVD->getType());
+    // Align the size: ((size + align - 1) / align) * align
+    Size = CGF.Builder.CreateNUWAdd(
+        Size, CGM.getSize(Align - CharUnits::fromQuantity(1)));
+    Size = CGF.Builder.CreateUDiv(Size, CGM.getSize(Align));
+    Size = CGF.Builder.CreateNUWMul(Size, CGM.getSize(Align));
+  } else {
+    CharUnits Sz = CGM.getContext().getTypeSizeInChars(CVD->getType());
+    Size = CGM.getSize(Sz.alignTo(Align));
+  }
+
+  assert(AA->getAllocator() &&
+         "Expected allocator expression for non-default allocator.");
+  llvm::Value *Allocator = CGF.EmitScalarExpr(AA->getAllocator());
+  // According to the standard, the original allocator type is a enum (integer).
+  // Convert to pointer type, if required.
+  if (Allocator->getType()->isIntegerTy())
+    Allocator = CGF.Builder.CreateIntToPtr(Allocator, CGM.VoidPtrTy);
+  else if (Allocator->getType()->isPointerTy())
+    Allocator = CGF.Builder.CreatePointerBitCastOrAddrSpaceCast(Allocator,
+                                                                CGM.VoidPtrTy);
+
+  llvm::Value *Addr = OMPBuilder->CreateOMPAlloc(
+      CGF.Builder, Size, Allocator,
+      getNameWithSeparators({CVD->getName(), ".void.addr"}, ".", "."));
+  llvm::CallInst *FreeCI =
+      OMPBuilder->CreateOMPFree(CGF.Builder, Addr, Allocator);
+
+  CGF.EHStack.pushCleanup<OMPAllocateCleanupTy>(NormalAndEHCleanup, FreeCI);
+  Addr = CGF.Builder.CreatePointerBitCastOrAddrSpaceCast(
+      Addr,
+      CGF.ConvertTypeForMem(CGM.getContext().getPointerType(CVD->getType())),
+      getNameWithSeparators({CVD->getName(), ".addr"}, ".", "."));
+  return Address(Addr, Align);
+}
+
+Address CodeGenFunction::OMPBuilderCBHelpers::getAddrOfThreadPrivate(
+    CodeGenFunction &CGF, const VarDecl *VD, Address VDAddr,
+    SourceLocation Loc) {
+  CodeGenModule &CGM = CGF.CGM;
+  if (CGM.getLangOpts().OpenMPUseTLS &&
+      CGM.getContext().getTargetInfo().isTLSSupported())
+    return VDAddr;
+
+  llvm::OpenMPIRBuilder *OMPBuilder = CGM.getOpenMPIRBuilder();
+  assert(OMPBuilder && "OpenMPIRBuilder is not initialized or used.");
+
+  llvm::Type *VarTy = VDAddr.getElementType();
+  llvm::Value *Data =
+      CGF.Builder.CreatePointerCast(VDAddr.getPointer(), CGM.Int8PtrTy);
+  llvm::ConstantInt *Size = CGM.getSize(CGM.GetTargetTypeStoreSize(VarTy));
+  std::string Suffix = getNameWithSeparators({"cache", ""});
+  llvm::Twine CacheName = Twine(CGM.getMangledName(VD)).concat(Suffix);
+
+  llvm::CallInst *ThreadPrivateCacheCall =
+      OMPBuilder->CreateCachedThreadPrivate(CGF.Builder, Data, Size, CacheName);
+
+  return Address(ThreadPrivateCacheCall, VDAddr.getAlignment());
+}
+
+std::string CodeGenFunction::OMPBuilderCBHelpers::getNameWithSeparators(
+    ArrayRef<StringRef> Parts, StringRef FirstSeparator, StringRef Separator) {
+  SmallString<128> Buffer;
+  llvm::raw_svector_ostream OS(Buffer);
+  StringRef Sep = FirstSeparator;
+  for (StringRef Part : Parts) {
+    OS << Sep << Part;
+    Sep = Separator;
+  }
+  return OS.str().str();
+}
 void CodeGenFunction::EmitOMPParallelDirective(const OMPParallelDirective &S) {
   if (llvm::OpenMPIRBuilder *OMPBuilder = CGM.getOpenMPIRBuilder()) {
     // Check if we have any if clause associated with the directive.
     llvm::Value *IfCond = nullptr;
     if (const auto *C = S.getSingleClause<OMPIfClause>())
       IfCond = EmitScalarExpr(C->getCondition(),
                               /*IgnoreResultAssign=*/true);
 

clang/lib/CodeGen/CodeGenFunction.h

 #include "CodeGenPGO.h"
 #include "EHScopeStack.h"
 #include "VarBypassDetector.h"
 #include "clang/AST/CharUnits.h"
 #include "clang/AST/CurrentSourceLocExprScope.h"
 #include "clang/AST/ExprCXX.h"
 #include "clang/AST/ExprObjC.h"
 #include "clang/AST/ExprOpenMP.h"
+#include "clang/AST/StmtOpenMP.h"
 #include "clang/AST/Type.h"
 #include "clang/Basic/ABI.h"
 #include "clang/Basic/CapturedStmt.h"
 #include "clang/Basic/CodeGenOptions.h"
 #include "clang/Basic/OpenMPKinds.h"
 #include "clang/Basic/TargetInfo.h"
 #include "llvm/ADT/ArrayRef.h"
 #include "llvm/ADT/DenseMap.h"

 class TargetInfo;
 class VarDecl;
 class ObjCForCollectionStmt;
 class ObjCAtTryStmt;
 class ObjCAtThrowStmt;
 class ObjCAtSynchronizedStmt;
 class ObjCAutoreleasePoolStmt;
 class ReturnsNonNullAttr;
+class OMPExecutableDirective;
 
 namespace analyze_os_log {
 class OSLogBufferLayout;
 }
 
 namespace CodeGen {
 class CodeGenTypes;
 class CGCallee;
struct JumpDest {
     }
 
   private:
     llvm::BasicBlock *Block;
     EHScopeStack::stable_iterator ScopeDepth;
     unsigned Index;
   };
 
-  // Helper class for the OpenMP IR Builder. Allows reusability of code used for
-  // region body, and finalization codegen callbacks. This will class will also
-  // contain privatization functions used by the privatization call backs
-  struct OMPBuilderCBHelpers {
-
-    using InsertPointTy = llvm::OpenMPIRBuilder::InsertPointTy;
-
-    /// Emit the Finalization for an OMP region
-    /// \param CGF  The Codegen function this belongs to
-    /// \param IP Insertion point for generating the finalization code.
-    static void FinalizeOMPRegion(CodeGenFunction &CGF, InsertPointTy IP) {
-      CGBuilderTy::InsertPointGuard IPG(CGF.Builder);
-      assert(IP.getBlock()->end() != IP.getPoint() &&
-             "OpenMP IR Builder should cause terminated block!");
-
-      llvm::BasicBlock *IPBB = IP.getBlock();
-      llvm::BasicBlock *DestBB = IPBB->getUniqueSuccessor();
-      assert(DestBB && "Finalization block should have one successor!");
-
-      // erase and replace with cleanup branch.
-      IPBB->getTerminator()->eraseFromParent();
-      CGF.Builder.SetInsertPoint(IPBB);
-      CodeGenFunction::JumpDest Dest = CGF.getJumpDestInCurrentScope(DestBB);
-      CGF.EmitBranchThroughCleanup(Dest);
-    }
-
-    /// Emit the body of an OMP region
-    /// \param CGF  The Codegen function this belongs to
-    /// \param RegionBodyStmt The body statement for the OpenMP region being
-    ///        generated
-    /// \param CodeGenIP  Insertion point for generating the body code.
-    /// \param FiniBB The finalization basic block
-    static void EmitOMPRegionBody(CodeGenFunction &CGF,
-                                  const Stmt *RegionBodyStmt,
-                                  InsertPointTy CodeGenIP,
-                                  llvm::BasicBlock &FiniBB) {
-      llvm::BasicBlock *CodeGenIPBB = CodeGenIP.getBlock();
-      if (llvm::Instruction *CodeGenIPBBTI = CodeGenIPBB->getTerminator())
-        CodeGenIPBBTI->eraseFromParent();
-
-      CGF.Builder.SetInsertPoint(CodeGenIPBB);
-
-      CGF.EmitStmt(RegionBodyStmt);
-
-      if (CGF.Builder.saveIP().isSet())
-        CGF.Builder.CreateBr(&FiniBB);
-    }
-
-    /// RAII for preserving necessary info during Outlined region body codegen.
-    class OutlinedRegionBodyRAII {
-
-      llvm::AssertingVH<llvm::Instruction> OldAllocaIP;
-      CodeGenFunction::JumpDest OldReturnBlock;
-      CodeGenFunction &CGF;
-
-    public:
-      OutlinedRegionBodyRAII(CodeGenFunction &cgf, InsertPointTy &AllocaIP,
-                             llvm::BasicBlock &RetBB)
-          : CGF(cgf) {
-        assert(AllocaIP.isSet() &&
-               "Must specify Insertion point for allocas of outlined function");
-        OldAllocaIP = CGF.AllocaInsertPt;
-        CGF.AllocaInsertPt = &*AllocaIP.getPoint();
-
-        OldReturnBlock = CGF.ReturnBlock;
-        CGF.ReturnBlock = CGF.getJumpDestInCurrentScope(&RetBB);
-      }
-
-      ~OutlinedRegionBodyRAII() {
-        CGF.AllocaInsertPt = OldAllocaIP;
-        CGF.ReturnBlock = OldReturnBlock;
-      }
-    };
-
-    /// RAII for preserving necessary info during inlined region body codegen.
-    class InlinedRegionBodyRAII {
-
-      llvm::AssertingVH<llvm::Instruction> OldAllocaIP;
-      CodeGenFunction &CGF;
-
-    public:
-      InlinedRegionBodyRAII(CodeGenFunction &cgf, InsertPointTy &AllocaIP,
-                            llvm::BasicBlock &FiniBB)
-          : CGF(cgf) {
-        // Alloca insertion block should be in the entry block of the containing
-        // function so it expects an empty AllocaIP in which case will reuse the
-        // old alloca insertion point, or a new AllocaIP in the same block as
-        // the old one
-        assert((!AllocaIP.isSet() ||
-                CGF.AllocaInsertPt->getParent() == AllocaIP.getBlock()) &&
-               "Insertion point should be in the entry block of containing "
-               "function!");
-        OldAllocaIP = CGF.AllocaInsertPt;
-        if (AllocaIP.isSet())
-          CGF.AllocaInsertPt = &*AllocaIP.getPoint();
-
-        // TODO: Remove the call, after making sure the counter is not used by
-        //       the EHStack.
-        // Since this is an inlined region, it should not modify the
-        // ReturnBlock, and should reuse the one for the enclosing outlined
-        // region. So, the JumpDest being return by the function is discarded
-        (void)CGF.getJumpDestInCurrentScope(&FiniBB);
-      }
-
-      ~InlinedRegionBodyRAII() { CGF.AllocaInsertPt = OldAllocaIP; }
-    };
-  };
-
   CodeGenModule &CGM;  // Per-module state.
   const TargetInfo &Target;
 
   typedef std::pair<llvm::Value *, llvm::Value *> ComplexPairTy;
   LoopInfoStack LoopStack;
   CGBuilderTy Builder;
 
   // Stores variables for which we can't generate correct lifetime markers
private:
     llvm::Value *OldCXXThisValue;
     CharUnits OldCXXABIThisAlignment;
     CharUnits OldCXXThisAlignment;
     Address OldReturnValue;
     QualType OldFnRetTy;
     CallArgList OldCXXInheritedCtorInitExprArgs;
   };
 
+  // Helper class for the OpenMP IR Builder. Allows reusability of code used for
+  // region body, and finalization codegen callbacks. This will class will also
+  // contain privatization functions used by the privatization call backs
+  //
+  // TODO: this is temporary class for things that are being moved out of
+  // CGOpenMPRuntime, new versions of current CodeGenFunction methods, or
+  // utility function for use with the OMPBuilder. Once that move to use the
+  // OMPBuilder is done, everything here will either become part of CodeGenFunc.
+  // directly, or a new helper class that will contain functions used by both
+  // this and the OMPBuilder
+
+  struct OMPBuilderCBHelpers {
+
+    OMPBuilderCBHelpers() = delete;
+    OMPBuilderCBHelpers(const OMPBuilderCBHelpers &) = delete;
+    OMPBuilderCBHelpers &operator=(const OMPBuilderCBHelpers &) = delete;
+
+    using InsertPointTy = llvm::OpenMPIRBuilder::InsertPointTy;
+
+    /// Cleanup action for allocate support.
+    class OMPAllocateCleanupTy final : public EHScopeStack::Cleanup {
+
+    private:
+      llvm::CallInst *RTLFnCI;
+
+    public:
+      OMPAllocateCleanupTy(llvm::CallInst *RLFnCI) : RTLFnCI(RLFnCI) {
+        RLFnCI->removeFromParent();
+      }
+      void Emit(CodeGenFunction &CGF, Flags /*flags*/) override {
+        if (!CGF.HaveInsertPoint())
+          return;
+        CGF.Builder.Insert(RTLFnCI);
+      }
+    };
+
+    static llvm::Instruction *GetAllocaInsertPoint(llvm::BasicBlock *BB) {
+      auto I = BB->getFirstNonPHIOrDbgOrLifetime()->getIterator();
+      while (!isa<llvm::AllocaInst>(I) && I != BB->end())
+        ++I;
+      while (isa<llvm::AllocaInst>(I) && I != BB->end())
+        ++I;
+
+      return &*I;
+    }
+
+    /// Returns address of the threadprivate variable for the current
+    /// thread. This Also create any necessary OMP runtime calls.
+    ///
+    /// \param VD VarDecl for Threadprivate variable.
+    /// \param VDAddr Address of the Vardecl
+    /// \param Loc  The location where the barrier directive was encountered
+    static Address getAddrOfThreadPrivate(CodeGenFunction &CGF,
+                                          const VarDecl *VD, Address VDAddr,
+                                          SourceLocation Loc);
+
+    /// Gets the OpenMP-specific address of the local variable /p VD.
+    static Address getAddressOfLocalVariable(CodeGenFunction &CGF,
+                                             const VarDecl *VD);
+
+    /// Get the platform-specific name separator.
+    /// \param Parts different parts of the final name that needs separation
+    /// \param FirstSeparator First separator used between the initial two
+    ///        parts of the name.
+    /// \param Separator separator used between all of the rest consecutinve
+    ///        parts of the name
+    static std::string getNameWithSeparators(ArrayRef<StringRef> Parts,
+                                             StringRef FirstSeparator = ".",
+                                             StringRef Separator = ".");
+
+    /// Emit the Finalization for an OMP region
+    /// \param CGF  The Codegen function this belongs to
+    /// \param IP Insertion point for generating the finalization code.
+    static void FinalizeOMPRegion(CodeGenFunction &CGF, InsertPointTy IP) {
+      CGBuilderTy::InsertPointGuard IPG(CGF.Builder);
+      assert(IP.getBlock()->end() != IP.getPoint() &&
+             "OpenMP IR Builder should cause terminated block!");
+
+      llvm::BasicBlock *IPBB = IP.getBlock();
+      llvm::BasicBlock *DestBB = IPBB->getUniqueSuccessor();
+      assert(DestBB && "Finalization block should have one successor!");
+
+      // erase and replace with cleanup branch.
+      IPBB->getTerminator()->eraseFromParent();
+      CGF.Builder.SetInsertPoint(IPBB);
+      CodeGenFunction::JumpDest Dest = CGF.getJumpDestInCurrentScope(DestBB);
+      CGF.EmitBranchThroughCleanup(Dest);
+    }
+
+    /// Emit the body of an OMP region
+    /// \param CGF  The Codegen function this belongs to
+    /// \param RegionBodyStmt The body statement for the OpenMP region being
+    ///        generated
+    /// \param CodeGenIP  Insertion point for generating the body code.
+    /// \param FiniBB The finalization basic block
+    static void EmitOMPRegionBody(CodeGenFunction &CGF,
+                                  const Stmt *RegionBodyStmt,
+                                  InsertPointTy CodeGenIP,
+                                  llvm::BasicBlock &FiniBB) {
+      llvm::BasicBlock *CodeGenIPBB = CodeGenIP.getBlock();
+      if (llvm::Instruction *CodeGenIPBBTI = CodeGenIPBB->getTerminator())
+        CodeGenIPBBTI->eraseFromParent();
+
+      CGF.Builder.SetInsertPoint(CodeGenIPBB);
+
+      CGF.EmitStmt(RegionBodyStmt);
+
+      if (CGF.Builder.saveIP().isSet())
+        CGF.Builder.CreateBr(&FiniBB);
+    }
+
+    /// RAII for preserving necessary info during Outlined region body codegen.
+    class OutlinedRegionBodyRAII {
+
+      llvm::AssertingVH<llvm::Instruction> OldAllocaIP;
+      CodeGenFunction::JumpDest OldReturnBlock;
+      CGBuilderTy::InsertPoint IP;
+      CodeGenFunction &CGF;
+
+    public:
+      OutlinedRegionBodyRAII(CodeGenFunction &cgf, InsertPointTy &AllocaIP,
+                             llvm::BasicBlock &RetBB)
+          : CGF(cgf) {
+        assert(AllocaIP.isSet() &&
+               "Must specify Insertion point for allocas of outlined function");
+        OldAllocaIP = CGF.AllocaInsertPt;
+        CGF.AllocaInsertPt = &*AllocaIP.getPoint();
+        IP = CGF.Builder.saveIP();
+
+        OldReturnBlock = CGF.ReturnBlock;
+        CGF.ReturnBlock = CGF.getJumpDestInCurrentScope(&RetBB);
+      }
+
+      ~OutlinedRegionBodyRAII() {
+        CGF.AllocaInsertPt = OldAllocaIP;
+        CGF.ReturnBlock = OldReturnBlock;
+        CGF.Builder.restoreIP(IP);
+      }
+    };
+
+    /// RAII for preserving necessary info during inlined region body codegen.
+    class InlinedRegionBodyRAII {
+
+      llvm::AssertingVH<llvm::Instruction> OldAllocaIP;
+      CodeGenFunction &CGF;
+
+    public:
+      InlinedRegionBodyRAII(CodeGenFunction &cgf, InsertPointTy &AllocaIP,
+                            llvm::BasicBlock &FiniBB)
+          : CGF(cgf) {
+        // Alloca insertion block should be in the entry block of the containing
+        // function so it expects an empty AllocaIP in which case will reuse the
+        // old alloca insertion point, or a new AllocaIP in the same block as
+        // the old one
+        assert((!AllocaIP.isSet() ||
+                CGF.AllocaInsertPt->getParent() == AllocaIP.getBlock()) &&
+               "Insertion point should be in the entry block of containing "
+               "function!");
+        OldAllocaIP = CGF.AllocaInsertPt;
+        if (AllocaIP.isSet())
+          CGF.AllocaInsertPt = &*AllocaIP.getPoint();
+
+        // TODO: Remove the call, after making sure the counter is not used by
+        //       the EHStack.
+        // Since this is an inlined region, it should not modify the
+        // ReturnBlock, and should reuse the one for the enclosing outlined
+        // region. So, the JumpDest being return by the function is discarded
+        (void)CGF.getJumpDestInCurrentScope(&FiniBB);
+      }
+
+      ~InlinedRegionBodyRAII() { CGF.AllocaInsertPt = OldAllocaIP; }
+    };
+  };
+
 private:
   /// CXXThisDecl - When generating code for a C++ member function,
   /// this will hold the implicit 'this' declaration.
   ImplicitParamDecl *CXXABIThisDecl = nullptr;
   llvm::Value *CXXABIThisValue = nullptr;
   llvm::Value *CXXThisValue = nullptr;
   CharUnits CXXABIThisAlignment;
   CharUnits CXXThisAlignment;