[VE] Minimal codegen for empty functions

[simoll]

Summary

This patch implements minimal VE code generation for empty function bodies (no args, no value return).

Contents

• empty function code generation test.
• Minimal function prologue & epilogue emission
• Instruction formats and instruction definitions as far as required for the empty function prologue & epilogue.
• I64 register class definitions.

This patch deviates from the common practice of having separate patches for the register file, instruction formats and instructions that offer self-contained logic but come without any tests. We are trying something new here: by implementing the (close to) minimum of everything in one patch, this patch is a minimal testable unit for VE code generation.

[simoll]

Stripped custom VEMachineFunction

[arsenm]

llvm/lib/Target/VE/InstPrinter/VEInstPrinter.cpp

62

Why bother with the truncation?

83–87

Invert condition and avoid empty true block

llvm/lib/Target/VE/VEFrameLowering.h

9

Drop empty comment section?

[simoll]

Addressed arsenm's comments.

[simoll]

added a meaningful header description

[arsenm]

LGTM with a few more nits

llvm/lib/Target/VE/VEFrameLowering.cpp

307

Capitalize comments and demorgan

llvm/lib/Target/VE/VEISelLowering.cpp

79

s/unsigned/Register

llvm/lib/Target/VE/VEInstrInfo.cpp

106–108

.add*s on separate line like other BuildMI calls? It was mixed in other files too

llvm/lib/Target/VE/VEMCInstLower.cpp

41

dead break

[simoll]

Changes

• Argument additions to BuildMI on separate lines everywhere.
• Fixed LO32/HI32 immediate truncation.
• Stripped unused reg pressure set from VERegisterInfo.
• Capitalized comments.

[arsenm]

llvm/lib/Target/VE/VE.h

97–99

MathExtras.h already has Lo_32/Hi_32 for this

[simoll]

We use LO32, HI32 here to always represent immediates in the numerical domain of LLVM immediates (signed int64_t).
The advantage of this is that we can check whether any immediates are representable as signed 32bit literals when emitting assembly.
When using LLVM's Lo_32/Hi_32 along with other sources of immediates it is not possible to tell in the asm printer whether 0x00000000FFFFFFFF should be -1 or is in fact too large for signed 32bit integer literals.

[arsenm]

llvm/lib/Target/VE/InstPrinter/VEInstPrinter.cpp

64–66

assert(isInt<32>())

[simoll]

• Rebased
• isInt<32>(MO.getImm())

llvm/lib/Target/VE/CMakeLists.txt

 set(LLVM_TARGET_DEFINITIONS VE.td)
 
+tablegen(LLVM VEGenRegisterInfo.inc -gen-register-info)
+tablegen(LLVM VEGenInstrInfo.inc -gen-instr-info)
+tablegen(LLVM VEGenAsmWriter.inc -gen-asm-writer)
+tablegen(LLVM VEGenDAGISel.inc -gen-dag-isel)
+tablegen(LLVM VEGenSubtargetInfo.inc -gen-subtarget)
+tablegen(LLVM VEGenCallingConv.inc -gen-callingconv)
+add_public_tablegen_target(VECommonTableGen)
+
 add_llvm_target(VECodeGen
+  VEAsmPrinter.cpp
+  VEFrameLowering.cpp
+  VEISelDAGToDAG.cpp
+  VEISelLowering.cpp
+  VEInstrInfo.cpp
+  VEMachineFunctionInfo.cpp
+  VEMCInstLower.cpp
+  VERegisterInfo.cpp
+  VESubtarget.cpp
   VETargetMachine.cpp
   )
 
+add_subdirectory(InstPrinter)
 add_subdirectory(TargetInfo)
 add_subdirectory(MCTargetDesc)

llvm/lib/Target/VE/InstPrinter/CMakeLists.txt

+add_llvm_component_library(LLVMVEAsmPrinter
+  VEInstPrinter.cpp
+  )

llvm/lib/Target/VE/InstPrinter/LLVMBuild.txt

-;===- ./lib/Target/VE/MCTargetDesc/LLVMBuild.txt ---------------*- Conf -*--===;
+;===- ./lib/Target/VE/InstPrinter/LLVMBuild.txt ----------------*- Conf -*--===;
 ;
 ; 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
 ;
 ;===------------------------------------------------------------------------===;
 ;
 ; This is an LLVMBuild description file for the components in this subdirectory.
 ;
 ; For more information on the LLVMBuild system, please see:
 ;
 ;   http://llvm.org/docs/LLVMBuild.html
 ;
 ;===------------------------------------------------------------------------===;
 
 [component_0]
 type = Library
-name = VEDesc
+name = VEAsmPrinter
 parent = VE
-required_libraries = MC VEInfo Support
+required_libraries = MC Support
 add_to_library_groups = VE

llvm/lib/Target/VE/InstPrinter/VEInstPrinter.h

+//===-- VEInstPrinter.h - Convert VE MCInst to assembly syntax ------------===//
+//
+// 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
+//
+//===----------------------------------------------------------------------===//
+//
+// This class prints an VE MCInst to a .s file.
+//
+//===----------------------------------------------------------------------===//
+
+#ifndef LLVM_LIB_TARGET_VE_INSTPRINTER_VEINSTPRINTER_H
+#define LLVM_LIB_TARGET_VE_INSTPRINTER_VEINSTPRINTER_H
+
+#include "llvm/MC/MCInstPrinter.h"
+
+namespace llvm {
+
+class VEInstPrinter : public MCInstPrinter {
+public:
+  VEInstPrinter(const MCAsmInfo &MAI, const MCInstrInfo &MII,
+                const MCRegisterInfo &MRI)
+      : MCInstPrinter(MAI, MII, MRI) {}
+
+  void printRegName(raw_ostream &OS, unsigned RegNo) const override;
+  void printInst(const MCInst *MI, uint64_t Address, StringRef Annot,
+                 const MCSubtargetInfo &STI, raw_ostream &OS) override;
+
+  // Autogenerated by tblgen.
+  bool printAliasInstr(const MCInst *, const MCSubtargetInfo &, raw_ostream &);
+  void printInstruction(const MCInst *, uint64_t, const MCSubtargetInfo &,
+                        raw_ostream &);
+  static const char *getRegisterName(unsigned RegNo);
+
+  void printOperand(const MCInst *MI, int opNum, const MCSubtargetInfo &STI,
+                    raw_ostream &OS);
+  void printMemASXOperand(const MCInst *MI, int opNum,
+                          const MCSubtargetInfo &STI, raw_ostream &OS,
+                          const char *Modifier = nullptr);
+  void printMemASOperand(const MCInst *MI, int opNum,
+                         const MCSubtargetInfo &STI, raw_ostream &OS,
+                         const char *Modifier = nullptr);
+  void printCCOperand(const MCInst *MI, int opNum, const MCSubtargetInfo &STI,
+                      raw_ostream &OS);
+};
+} // namespace llvm
+
+#endif

llvm/lib/Target/VE/InstPrinter/VEInstPrinter.cpp

+//===-- VEInstPrinter.cpp - Convert VE MCInst to assembly syntax -----------==//
+//
+// 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
+//
+//===----------------------------------------------------------------------===//
+//
+// This class prints an VE MCInst to a .s file.
+//
+//===----------------------------------------------------------------------===//
+
+#include "VEInstPrinter.h"
+#include "VE.h"
+#include "llvm/MC/MCExpr.h"
+#include "llvm/MC/MCInst.h"
+#include "llvm/MC/MCRegisterInfo.h"
+#include "llvm/MC/MCSubtargetInfo.h"
+#include "llvm/MC/MCSymbol.h"
+#include "llvm/Support/raw_ostream.h"
+using namespace llvm;
+
+#define DEBUG_TYPE "ve-asmprinter"
+
+// The generated AsmMatcher VEGenAsmWriter uses "VE" as the target
+// namespace.
+namespace llvm {
+namespace VE {
+using namespace VE;
+}
+} // namespace llvm
+
+#define GET_INSTRUCTION_NAME
+#define PRINT_ALIAS_INSTR
+#include "VEGenAsmWriter.inc"
+
+void VEInstPrinter::printRegName(raw_ostream &OS, unsigned RegNo) const {
+  OS << '%' << StringRef(getRegisterName(RegNo)).lower();
+}
+
+void VEInstPrinter::printInst(const MCInst *MI, uint64_t Address,
+                              StringRef Annot, const MCSubtargetInfo &STI,
+                              raw_ostream &OS) {
+  if (!printAliasInstr(MI, STI, OS))
+    printInstruction(MI, Address, STI, OS);
+  printAnnotation(OS, Annot);
+}
+
+void VEInstPrinter::printOperand(const MCInst *MI, int opNum,
+                                 const MCSubtargetInfo &STI, raw_ostream &O) {
+  const MCOperand &MO = MI->getOperand(opNum);
+
+  if (MO.isReg()) {
+    printRegName(O, MO.getReg());
+    return;
+  }
+
+  if (MO.isImm()) {
+    switch (MI->getOpcode()) {
+    default:
+      O << (int)MO.getImm();
+      return;
+    }
+  }
+
+  assert(MO.isExpr() && "Unknown operand kind in printOperand");
+  MO.getExpr()->print(O, &MAI);
+}
+
+void VEInstPrinter::printMemASXOperand(const MCInst *MI, int opNum,
+                                       const MCSubtargetInfo &STI,
+                                       raw_ostream &O, const char *Modifier) {
+  // If this is an ADD operand, emit it like normal operands.
+  if (Modifier && !strcmp(Modifier, "arith")) {
+    printOperand(MI, opNum, STI, O);
+    O << ", ";
+    printOperand(MI, opNum + 1, STI, O);
+    return;
+  }
+
+  const MCOperand &MO = MI->getOperand(opNum + 1);
+  if (MO.isImm() && MO.getImm() == 0) {
+    // don't print "+0"
+  } else {
+    printOperand(MI, opNum + 1, STI, O);
+  }
+  O << "(,";
+  printOperand(MI, opNum, STI, O);
+  O << ")";
+}
+
+void VEInstPrinter::printMemASOperand(const MCInst *MI, int opNum,
+                                      const MCSubtargetInfo &STI,
+                                      raw_ostream &O, const char *Modifier) {
+  // If this is an ADD operand, emit it like normal operands.
+  if (Modifier && !strcmp(Modifier, "arith")) {
+    printOperand(MI, opNum, STI, O);
+    O << ", ";
+    printOperand(MI, opNum + 1, STI, O);
+    return;
+  }
+
+  const MCOperand &MO = MI->getOperand(opNum + 1);
+  if (MO.isImm() && MO.getImm() == 0) {
+    // don't print "+0"
+  } else {
+    printOperand(MI, opNum + 1, STI, O);
+  }
+  O << "(";
+  printOperand(MI, opNum, STI, O);
+  O << ")";
+}
+
+void VEInstPrinter::printCCOperand(const MCInst *MI, int opNum,
+                                   const MCSubtargetInfo &STI, raw_ostream &O) {
+  int CC = (int)MI->getOperand(opNum).getImm();
+  O << VECondCodeToString((VECC::CondCodes)CC);
+}

llvm/lib/Target/VE/LLVMBuild.txt

 ;
 ; For more information on the LLVMBuild system, please see:
 ;
 ;   http://llvm.org/docs/LLVMBuild.html
 ;
 ;===------------------------------------------------------------------------===;
 
 [common]
-subdirectories = MCTargetDesc TargetInfo
+subdirectories = InstPrinter MCTargetDesc TargetInfo
 
 [component_0]
 type = TargetGroup
 name = VE
 parent = Target
 has_asmparser = 0
-has_asmprinter = 0
+has_asmprinter = 1
 
 [component_1]
 type = Library
 name = VECodeGen
 parent = VE
-required_libraries = Analysis AsmPrinter CodeGen Core MC SelectionDAG 
+required_libraries = Analysis AsmPrinter CodeGen Core
+                     MC SelectionDAG VEAsmPrinter
                      VEDesc VEInfo Support Target
 add_to_library_groups = VE

llvm/lib/Target/VE/MCTargetDesc/CMakeLists.txt

-add_llvm_library(LLVMVEDesc
+add_llvm_component_library(LLVMVEDesc
+  VEMCAsmInfo.cpp
   VEMCTargetDesc.cpp
+  VETargetStreamer.cpp
   )

llvm/lib/Target/VE/MCTargetDesc/LLVMBuild.txt

 ;   http://llvm.org/docs/LLVMBuild.html
 ;
 ;===------------------------------------------------------------------------===;
 
 [component_0]
 type = Library
 name = VEDesc
 parent = VE
-required_libraries = MC VEInfo Support
+required_libraries = MC VEAsmPrinter VEInfo Support
 add_to_library_groups = VE

llvm/lib/Target/VE/MCTargetDesc/VEMCAsmInfo.h

+//===- VEMCAsmInfo.h - VE asm properties -----------------------*- 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
+//
+//===----------------------------------------------------------------------===//
+//
+// This file contains the declaration of the VEMCAsmInfo class.
+//
+//===----------------------------------------------------------------------===//
+
+#ifndef LLVM_LIB_TARGET_VE_MCTARGETDESC_VEMCASMINFO_H
+#define LLVM_LIB_TARGET_VE_MCTARGETDESC_VEMCASMINFO_H
+
+#include "llvm/MC/MCAsmInfoELF.h"
+
+namespace llvm {
+
+class Triple;
+
+class VEELFMCAsmInfo : public MCAsmInfoELF {
+  void anchor() override;
+
+public:
+  explicit VEELFMCAsmInfo(const Triple &TheTriple);
+};
+
+} // namespace llvm
+
+#endif // LLVM_LIB_TARGET_VE_MCTARGETDESC_VEMCASMINFO_H

llvm/lib/Target/VE/MCTargetDesc/VEMCAsmInfo.cpp

+//===- VEMCAsmInfo.cpp - VE asm properties --------------------------------===//
+//
+// 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
+//
+//===----------------------------------------------------------------------===//
+//
+// This file contains the declarations of the VEMCAsmInfo properties.
+//
+//===----------------------------------------------------------------------===//
+
+#include "VEMCAsmInfo.h"
+#include "llvm/ADT/Triple.h"
+#include "llvm/BinaryFormat/Dwarf.h"
+#include "llvm/MC/MCExpr.h"
+#include "llvm/MC/MCStreamer.h"
+#include "llvm/MC/MCTargetOptions.h"
+
+using namespace llvm;
+
+void VEELFMCAsmInfo::anchor() {}
+
+VEELFMCAsmInfo::VEELFMCAsmInfo(const Triple &TheTriple) {
+
+  CodePointerSize = CalleeSaveStackSlotSize = 8;
+  MaxInstLength = MinInstAlignment = 8;
+
+  // VE uses ".*byte" directive for unaligned data.
+  Data8bitsDirective = "\t.byte\t";
+  Data16bitsDirective = "\t.2byte\t";
+  Data32bitsDirective = "\t.4byte\t";
+  Data64bitsDirective = "\t.8byte\t";
+
+  // Uses '.section' before '.bss' directive.  VE requires this although
+  // assembler manual says sinple '.bss' is supported.
+  UsesELFSectionDirectiveForBSS = true;
+
+  SupportsDebugInformation = true;
+}

llvm/lib/Target/VE/MCTargetDesc/VEMCTargetDesc.h

 #ifndef LLVM_LIB_TARGET_VE_MCTARGETDESC_VEMCTARGETDESC_H
 #define LLVM_LIB_TARGET_VE_MCTARGETDESC_VEMCTARGETDESC_H
 
 #include "llvm/Support/DataTypes.h"
 
 #include <memory>
 
 namespace llvm {
-
+class MCAsmBackend;
+class MCCodeEmitter;
+class MCContext;
+class MCInstrInfo;
+class MCObjectWriter;
+class MCRegisterInfo;
+class MCSubtargetInfo;
+class MCTargetOptions;
 class Target;
+class Triple;
+class StringRef;
+class raw_pwrite_stream;
+class raw_ostream;
+
 Target &getTheVETarget();
 
-} // end llvm namespace
+} // namespace llvm
+
+// Defines symbolic names for VE registers.  This defines a mapping from
+// register name to register number.
+//
+#define GET_REGINFO_ENUM
+#include "VEGenRegisterInfo.inc"
+
+// Defines symbolic names for the VE instructions.
+//
+#define GET_INSTRINFO_ENUM
+#include "VEGenInstrInfo.inc"
+
+#define GET_SUBTARGETINFO_ENUM
+#include "VEGenSubtargetInfo.inc"
 
 #endif

llvm/lib/Target/VE/MCTargetDesc/VEMCTargetDesc.cpp

 //===-- VEMCTargetDesc.cpp - VE Target Descriptions -----------------------===//
 //
 // 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
 //
 //===----------------------------------------------------------------------===//
 //
 // This file provides VE specific target descriptions.
 //
 //===----------------------------------------------------------------------===//
 
 #include "VEMCTargetDesc.h"
+#include "InstPrinter/VEInstPrinter.h"
+#include "VEMCAsmInfo.h"
+#include "VETargetStreamer.h"
+#include "llvm/MC/MCInstrInfo.h"
+#include "llvm/MC/MCRegisterInfo.h"
+#include "llvm/MC/MCSubtargetInfo.h"
+#include "llvm/Support/ErrorHandling.h"
+#include "llvm/Support/TargetRegistry.h"
 
 using namespace llvm;
 
+#define GET_INSTRINFO_MC_DESC
+#include "VEGenInstrInfo.inc"
+
+#define GET_SUBTARGETINFO_MC_DESC
+#include "VEGenSubtargetInfo.inc"
+
+#define GET_REGINFO_MC_DESC
+#include "VEGenRegisterInfo.inc"
+
+static MCAsmInfo *createVEMCAsmInfo(const MCRegisterInfo &MRI, const Triple &TT,
+                                    const MCTargetOptions &Options) {
+  MCAsmInfo *MAI = new VEELFMCAsmInfo(TT);
+  unsigned Reg = MRI.getDwarfRegNum(VE::SX11, true);
+  MCCFIInstruction Inst = MCCFIInstruction::createDefCfa(nullptr, Reg, 0);
+  MAI->addInitialFrameState(Inst);
+  return MAI;
+}
+
+static MCInstrInfo *createVEMCInstrInfo() {
+  MCInstrInfo *X = new MCInstrInfo();
+  InitVEMCInstrInfo(X);
+  return X;
+}
+
+static MCRegisterInfo *createVEMCRegisterInfo(const Triple &TT) {
+  MCRegisterInfo *X = new MCRegisterInfo();
+  InitVEMCRegisterInfo(X, VE::SX10);
+  return X;
+}
+
+static MCSubtargetInfo *createVEMCSubtargetInfo(const Triple &TT, StringRef CPU,
+                                                StringRef FS) {
+  if (CPU.empty())
+    CPU = "ve";
+  return createVEMCSubtargetInfoImpl(TT, CPU, FS);
+}
+
+static MCTargetStreamer *
+createObjectTargetStreamer(MCStreamer &S, const MCSubtargetInfo &STI) {
+  return new VETargetELFStreamer(S);
+}
+
+static MCTargetStreamer *createTargetAsmStreamer(MCStreamer &S,
+                                                 formatted_raw_ostream &OS,
+                                                 MCInstPrinter *InstPrint,
+                                                 bool isVerboseAsm) {
+  return new VETargetAsmStreamer(S, OS);
+}
+
+static MCInstPrinter *createVEMCInstPrinter(const Triple &T,
+                                            unsigned SyntaxVariant,
+                                            const MCAsmInfo &MAI,
+                                            const MCInstrInfo &MII,
+                                            const MCRegisterInfo &MRI) {
+  return new VEInstPrinter(MAI, MII, MRI);
+}
+
 extern "C" void LLVMInitializeVETargetMC() {
-  // TODO
+  // Register the MC asm info.
+  RegisterMCAsmInfoFn X(getTheVETarget(), createVEMCAsmInfo);
+
+  for (Target *T : {&getTheVETarget()}) {
+    // Register the MC instruction info.
+    TargetRegistry::RegisterMCInstrInfo(*T, createVEMCInstrInfo);
+
+    // Register the MC register info.
+    TargetRegistry::RegisterMCRegInfo(*T, createVEMCRegisterInfo);
+
+    // Register the MC subtarget info.
+    TargetRegistry::RegisterMCSubtargetInfo(*T, createVEMCSubtargetInfo);
+
+    // Register the object target streamer.
+    TargetRegistry::RegisterObjectTargetStreamer(*T,
+                                                 createObjectTargetStreamer);
+
+    // Register the asm streamer.
+    TargetRegistry::RegisterAsmTargetStreamer(*T, createTargetAsmStreamer);
+
+    // Register the MCInstPrinter
+    TargetRegistry::RegisterMCInstPrinter(*T, createVEMCInstPrinter);
+  }
 }

llvm/lib/Target/VE/MCTargetDesc/VETargetStreamer.h

+//===-- VETargetStreamer.h - VE Target Streamer ----------------*- 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_LIB_TARGET_VE_VETARGETSTREAMER_H
+#define LLVM_LIB_TARGET_VE_VETARGETSTREAMER_H
+
+#include "llvm/MC/MCELFStreamer.h"
+#include "llvm/MC/MCStreamer.h"
+
+namespace llvm {
+class VETargetStreamer : public MCTargetStreamer {
+  virtual void anchor();
+
+public:
+  VETargetStreamer(MCStreamer &S);
+  /// Emit ".register <reg>, #ignore".
+  virtual void emitVERegisterIgnore(unsigned reg) = 0;
+  /// Emit ".register <reg>, #scratch".
+  virtual void emitVERegisterScratch(unsigned reg) = 0;
+};
+
+// This part is for ascii assembly output
+class VETargetAsmStreamer : public VETargetStreamer {
+  formatted_raw_ostream &OS;
+
+public:
+  VETargetAsmStreamer(MCStreamer &S, formatted_raw_ostream &OS);
+  void emitVERegisterIgnore(unsigned reg) override;
+  void emitVERegisterScratch(unsigned reg) override;
+};
+
+// This part is for ELF object output
+class VETargetELFStreamer : public VETargetStreamer {
+public:
+  VETargetELFStreamer(MCStreamer &S);
+  MCELFStreamer &getStreamer();
+  void emitVERegisterIgnore(unsigned reg) override {}
+  void emitVERegisterScratch(unsigned reg) override {}
+};
+} // namespace llvm
+
+#endif

llvm/lib/Target/VE/MCTargetDesc/VETargetStreamer.cpp

+//===-- VETargetStreamer.cpp - VE Target Streamer Methods -----------------===//
+//
+// 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
+//
+//===----------------------------------------------------------------------===//
+//
+// This file provides VE specific target streamer methods.
+//
+//===----------------------------------------------------------------------===//
+
+#include "VETargetStreamer.h"
+#include "InstPrinter/VEInstPrinter.h"
+#include "llvm/Support/FormattedStream.h"
+
+using namespace llvm;
+
+// pin vtable to this file
+VETargetStreamer::VETargetStreamer(MCStreamer &S) : MCTargetStreamer(S) {}
+
+void VETargetStreamer::anchor() {}
+
+VETargetAsmStreamer::VETargetAsmStreamer(MCStreamer &S,
+                                         formatted_raw_ostream &OS)
+    : VETargetStreamer(S), OS(OS) {}
+
+void VETargetAsmStreamer::emitVERegisterIgnore(unsigned reg) {
+  OS << "\t.register "
+     << "%" << StringRef(VEInstPrinter::getRegisterName(reg)).lower()
+     << ", #ignore\n";
+}
+
+void VETargetAsmStreamer::emitVERegisterScratch(unsigned reg) {
+  OS << "\t.register "
+     << "%" << StringRef(VEInstPrinter::getRegisterName(reg)).lower()
+     << ", #scratch\n";
+}
+
+VETargetELFStreamer::VETargetELFStreamer(MCStreamer &S) : VETargetStreamer(S) {}
+
+MCELFStreamer &VETargetELFStreamer::getStreamer() {
+  return static_cast<MCELFStreamer &>(Streamer);
+}

llvm/lib/Target/VE/VE.h

 // VE back-end.
 //
 //===----------------------------------------------------------------------===//
 
 #ifndef LLVM_LIB_TARGET_VE_VE_H
 #define LLVM_LIB_TARGET_VE_VE_H
 
 #include "MCTargetDesc/VEMCTargetDesc.h"
+#include "llvm/Support/ErrorHandling.h"
+#include "llvm/Target/TargetMachine.h"
 
+namespace llvm {
+class FunctionPass;
+class VETargetMachine;
+class formatted_raw_ostream;
+class AsmPrinter;
+class MCInst;
+class MachineInstr;
+
+FunctionPass *createVEISelDag(VETargetMachine &TM);
+FunctionPass *createVEPromoteToI1Pass();
+
+void LowerVEMachineInstrToMCInst(const MachineInstr *MI, MCInst &OutMI,
+                                 AsmPrinter &AP);
+} // namespace llvm
+
+namespace llvm {
+// Enums corresponding to VE condition codes, both icc's and fcc's.  These
+// values must be kept in sync with the ones in the .td file.
+namespace VECC {
+enum CondCodes {
+  // Integer comparison
+  CC_IG =  0,  // Greater
+  CC_IL =  1,  // Less
+  CC_INE = 2, // Not Equal
+  CC_IEQ = 3, // Equal
+  CC_IGE = 4, // Greater or Equal
+  CC_ILE = 5, // Less or Equal
+
+  // Floating point comparison
+  CC_AF =     0 + 6, // Never
+  CC_G =      1 + 6, // Greater
+  CC_L =      2 + 6, // Less
+  CC_NE =     3 + 6, // Not Equal
+  CC_EQ =     4 + 6, // Equal
+  CC_GE =     5 + 6, // Greater or Equal
+  CC_LE =     6 + 6, // Less or Equal
+  CC_NUM =    7 + 6, // Number
+  CC_NAN =    8 + 6, // NaN
+  CC_GNAN =   9 + 6, // Greater or NaN
+  CC_LNAN =  10 + 6, // Less or NaN
+  CC_NENAN = 11 + 6, // Not Equal or NaN
+  CC_EQNAN = 12 + 6, // Equal or NaN
+  CC_GENAN = 13 + 6, // Greater or Equal or NaN
+  CC_LENAN = 14 + 6, // Less or Equal or NaN
+  CC_AT =    15 + 6, // Always
+};
+}
+
+inline static const char *VECondCodeToString(VECC::CondCodes CC) {
+  switch (CC) {
+  case VECC::CC_IG:    return "gt";
+  case VECC::CC_IL:    return "lt";
+  case VECC::CC_INE:   return "ne";
+  case VECC::CC_IEQ:   return "eq";
+  case VECC::CC_IGE:   return "ge";
+  case VECC::CC_ILE:   return "le";
+  case VECC::CC_AF:    return "af";
+  case VECC::CC_G:     return "gt";
+  case VECC::CC_L:     return "lt";
+  case VECC::CC_NE:    return "ne";
+  case VECC::CC_EQ:    return "eq";
+  case VECC::CC_GE:    return "ge";
+  case VECC::CC_LE:    return "le";
+  case VECC::CC_NUM:   return "num";
+  case VECC::CC_NAN:   return "nan";
+  case VECC::CC_GNAN:  return "gtnan";
+  case VECC::CC_LNAN:  return "ltnan";
+  case VECC::CC_NENAN: return "nenan";
+  case VECC::CC_EQNAN: return "eqnan";
+  case VECC::CC_GENAN: return "genan";
+  case VECC::CC_LENAN: return "lenan";
+  case VECC::CC_AT:    return "at";
+  }
+  llvm_unreachable("Invalid cond code");
+}
+
+inline static unsigned HI32(int64_t imm) {
+  return (unsigned)((imm >> 32) & 0xFFFFFFFF);
+}
+
+inline static unsigned LO32(int64_t imm) {
+  return (unsigned)(imm & 0xFFFFFFFF);
+}
+
+} // namespace llvm
 #endif

llvm/lib/Target/VE/VE.td

+//===-- VE.td - Describe the VE Target Machine -------------*- tablegen -*-===//
+//
+// 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
+//
+//===----------------------------------------------------------------------===//
+//
+//
+//===----------------------------------------------------------------------===//
+
+//===----------------------------------------------------------------------===//
+// Target-independent interfaces which we are implementing
+//===----------------------------------------------------------------------===//
+
+include "llvm/Target/Target.td"
+
+//===----------------------------------------------------------------------===//
+// VE Subtarget features.
+//
+
+//===----------------------------------------------------------------------===//
+// Register File, Calling Conv, Instruction Descriptions
+//===----------------------------------------------------------------------===//
+
+include "VERegisterInfo.td"
+include "VECallingConv.td"
+include "VEInstrInfo.td"
+
+def VEInstrInfo : InstrInfo;
+
+//===----------------------------------------------------------------------===//
+// VE processors supported.
+//===----------------------------------------------------------------------===//
+
+class Proc<string Name, list<SubtargetFeature> Features>
+ : Processor<Name, NoItineraries, Features>;
+
+def : Proc<"ve",             []>;
+
+//===----------------------------------------------------------------------===//
+// Declare the target which we are implementing
+//===----------------------------------------------------------------------===//
+
+def VEAsmWriter : AsmWriter {
+  string AsmWriterClassName  = "InstPrinter";
+  int PassSubtarget = 1;
+  int Variant = 0;
+}
+
+def VE : Target {
+  // Pull in Instruction Info:
+  let InstructionSet = VEInstrInfo;
+  let AssemblyWriters = [VEAsmWriter];
+  let AllowRegisterRenaming = 1;
+}

llvm/lib/Target/VE/VEAsmPrinter.cpp

+//===-- VEAsmPrinter.cpp - VE LLVM assembly writer ------------------------===//
+//
+// 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
+//
+//===----------------------------------------------------------------------===//
+//
+// This file contains a printer that converts from our internal representation
+// of machine-dependent LLVM code to GAS-format VE assembly language.
+//
+//===----------------------------------------------------------------------===//
+
+#include "InstPrinter/VEInstPrinter.h"
+#include "MCTargetDesc/VETargetStreamer.h"
+#include "VE.h"
+#include "VEInstrInfo.h"
+#include "VETargetMachine.h"
+#include "llvm/CodeGen/AsmPrinter.h"
+#include "llvm/CodeGen/MachineInstr.h"
+#include "llvm/CodeGen/MachineModuleInfoImpls.h"
+#include "llvm/CodeGen/MachineRegisterInfo.h"
+#include "llvm/CodeGen/TargetLoweringObjectFileImpl.h"
+#include "llvm/IR/Mangler.h"
+#include "llvm/MC/MCAsmInfo.h"
+#include "llvm/MC/MCContext.h"
+#include "llvm/MC/MCInst.h"
+#include "llvm/MC/MCInstBuilder.h"
+#include "llvm/MC/MCStreamer.h"
+#include "llvm/MC/MCSymbol.h"
+#include "llvm/Support/TargetRegistry.h"
+#include "llvm/Support/raw_ostream.h"
+using namespace llvm;
+
+#define DEBUG_TYPE "ve-asmprinter"
+
+namespace {
+class VEAsmPrinter : public AsmPrinter {
+  VETargetStreamer &getTargetStreamer() {
+    return static_cast<VETargetStreamer &>(*OutStreamer->getTargetStreamer());
+  }
+
+public:
+  explicit VEAsmPrinter(TargetMachine &TM, std::unique_ptr<MCStreamer> Streamer)
+      : AsmPrinter(TM, std::move(Streamer)) {}
+
+  StringRef getPassName() const override { return "VE Assembly Printer"; }
+
+  void EmitInstruction(const MachineInstr *MI) override;
+
+  static const char *getRegisterName(unsigned RegNo) {
+    return VEInstPrinter::getRegisterName(RegNo);
+  }
+};
+} // end of anonymous namespace
+
+void VEAsmPrinter::EmitInstruction(const MachineInstr *MI) {
+
+  switch (MI->getOpcode()) {
+  default:
+    break;
+  case TargetOpcode::DBG_VALUE:
+    // FIXME: Debug Value.
+    return;
+  }
+  MachineBasicBlock::const_instr_iterator I = MI->getIterator();
+  MachineBasicBlock::const_instr_iterator E = MI->getParent()->instr_end();
+  do {
+    MCInst TmpInst;
+    LowerVEMachineInstrToMCInst(&*I, TmpInst, *this);
+    EmitToStreamer(*OutStreamer, TmpInst);
+  } while ((++I != E) && I->isInsideBundle()); // Delay slot check.
+}
+
+// Force static initialization.
+extern "C" void LLVMInitializeVEAsmPrinter() {
+  RegisterAsmPrinter<VEAsmPrinter> X(getTheVETarget());
+}

llvm/lib/Target/VE/VECallingConv.td

+//===-- VECallingConv.td - Calling Conventions VE ----------*- tablegen -*-===//
+//
+// 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
+//
+//===----------------------------------------------------------------------===//
+//
+// This describes the calling conventions for the VE architectures.
+//
+//===----------------------------------------------------------------------===//
+
+//===----------------------------------------------------------------------===//
+// Aurora VE
+//===----------------------------------------------------------------------===//
+
+// Callee-saved registers
+def CSR : CalleeSavedRegs<(add (sequence "SX%u", 18, 33))>;
+def CSR_NoRegs : CalleeSavedRegs<(add)>;

llvm/lib/Target/VE/VEFrameLowering.h

+//===-- VEFrameLowering.h - Define frame lowering for VE --*- 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_LIB_TARGET_VE_VEFRAMELOWERING_H
+#define LLVM_LIB_TARGET_VE_VEFRAMELOWERING_H
+
+#include "VE.h"
+#include "llvm/CodeGen/TargetFrameLowering.h"
+
+namespace llvm {
+
+class VESubtarget;
+class VEFrameLowering : public TargetFrameLowering {
+public:
+  explicit VEFrameLowering(const VESubtarget &ST);
+
+  /// emitProlog/emitEpilog - These methods insert prolog and epilog code into
+  /// the function.
+  void emitPrologue(MachineFunction &MF, MachineBasicBlock &MBB) const override;
+  void emitEpilogue(MachineFunction &MF, MachineBasicBlock &MBB) const override;
+  void emitPrologueInsns(MachineFunction &MF, MachineBasicBlock &MBB,
+                         MachineBasicBlock::iterator MBBI, int NumBytes,
+                         bool RequireFPUpdate) const;
+  void emitEpilogueInsns(MachineFunction &MF, MachineBasicBlock &MBB,
+                         MachineBasicBlock::iterator MBBI, int NumBytes,
+                         bool RequireFPUpdate) const;
+
+  MachineBasicBlock::iterator
+  eliminateCallFramePseudoInstr(MachineFunction &MF, MachineBasicBlock &MBB,
+                                MachineBasicBlock::iterator I) const override;
+
+  bool hasReservedCallFrame(const MachineFunction &MF) const override;
+  bool hasFP(const MachineFunction &MF) const override;
+  void determineCalleeSaves(MachineFunction &MF, BitVector &SavedRegs,
+                            RegScavenger *RS = nullptr) const override;
+
+  int getFrameIndexReference(const MachineFunction &MF, int FI,
+                             unsigned &FrameReg) const override;
+
+  const SpillSlot *
+  getCalleeSavedSpillSlots(unsigned &NumEntries) const override {
+    static const SpillSlot Offsets[] = {
+        {VE::SX17, 40},  {VE::SX18, 48},  {VE::SX19, 56},  {VE::SX20, 64},
+        {VE::SX21, 72},  {VE::SX22, 80},  {VE::SX23, 88},  {VE::SX24, 96},
+        {VE::SX25, 104}, {VE::SX26, 112}, {VE::SX27, 120}, {VE::SX28, 128},
+        {VE::SX29, 136}, {VE::SX30, 144}, {VE::SX31, 152}, {VE::SX32, 160},
+        {VE::SX33, 168}};
+    NumEntries = array_lengthof(Offsets);
+    return Offsets;
+  }
+
+  /// targetHandlesStackFrameRounding - Returns true if the target is
+  /// responsible for rounding up the stack frame (probably at emitPrologue
+  /// time).
+  bool targetHandlesStackFrameRounding() const override { return true; }
+
+private:
+  // Returns true if MF is a leaf procedure.
+  bool isLeafProc(MachineFunction &MF) const;
+
+  // Emits code for adjusting SP in function prologue/epilogue.
+  void emitSPAdjustment(MachineFunction &MF, MachineBasicBlock &MBB,
+                        MachineBasicBlock::iterator MBBI, int NumBytes) const;
+
+  // Emits code for extending SP in function prologue/epilogue.
+  void emitSPExtend(MachineFunction &MF, MachineBasicBlock &MBB,
+                    MachineBasicBlock::iterator MBBI, int NumBytes) const;
+};
+
+} // namespace llvm
+
+#endif

llvm/lib/Target/VE/VEFrameLowering.cpp

+//===-- VEFrameLowering.cpp - VE Frame Information ------------------------===//
+//
+// 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
+//
+//===----------------------------------------------------------------------===//
+//
+// This file contains the VE implementation of TargetFrameLowering class.
+//
+//===----------------------------------------------------------------------===//
+
+#include "VEFrameLowering.h"
+#include "VEInstrInfo.h"
+#include "VEMachineFunctionInfo.h"
+#include "VESubtarget.h"
+#include "llvm/CodeGen/MachineFrameInfo.h"
+#include "llvm/CodeGen/MachineFunction.h"
+#include "llvm/CodeGen/MachineInstrBuilder.h"
+#include "llvm/CodeGen/MachineModuleInfo.h"
+#include "llvm/CodeGen/MachineRegisterInfo.h"
+#include "llvm/CodeGen/RegisterScavenging.h"
+#include "llvm/IR/DataLayout.h"
+#include "llvm/IR/Function.h"
+#include "llvm/Support/CommandLine.h"
+#include "llvm/Target/TargetOptions.h"
+
+using namespace llvm;
+
+VEFrameLowering::VEFrameLowering(const VESubtarget &ST)
+    : TargetFrameLowering(TargetFrameLowering::StackGrowsDown, Align(16), 0,
+                          Align(16)) {}
+
+void VEFrameLowering::emitPrologueInsns(MachineFunction &MF,
+                                        MachineBasicBlock &MBB,
+                                        MachineBasicBlock::iterator MBBI,
+                                        int NumBytes,
+                                        bool RequireFPUpdate) const {
+
+  DebugLoc dl;
+  const VEInstrInfo &TII =
+      *static_cast<const VEInstrInfo *>(MF.getSubtarget().getInstrInfo());
+  // Insert following codes here as prologue
+  //
+  //    st %fp, 0(,%sp)
+  //    st %lr, 8(,%sp)
+  //    st %got, 24(,%sp)
+  //    st %plt, 32(,%sp)
+  //    or %fp, 0, %sp
+
+  BuildMI(MBB, MBBI, dl, TII.get(VE::STSri))
+      .addReg(VE::SX11)
+      .addImm(0)
+      .addReg(VE::SX9);
+  BuildMI(MBB, MBBI, dl, TII.get(VE::STSri))
+      .addReg(VE::SX11)
+      .addImm(8)
+      .addReg(VE::SX10);
+  BuildMI(MBB, MBBI, dl, TII.get(VE::STSri))
+      .addReg(VE::SX11)
+      .addImm(24)
+      .addReg(VE::SX15);
+  BuildMI(MBB, MBBI, dl, TII.get(VE::STSri))
+      .addReg(VE::SX11)
+      .addImm(32)
+      .addReg(VE::SX16);
+  BuildMI(MBB, MBBI, dl, TII.get(VE::ORri), VE::SX9).addReg(VE::SX11).addImm(0);
+}
+
+void VEFrameLowering::emitEpilogueInsns(MachineFunction &MF,
+                                        MachineBasicBlock &MBB,
+                                        MachineBasicBlock::iterator MBBI,
+                                        int NumBytes,
+                                        bool RequireFPUpdate) const {
+
+  DebugLoc dl;
+  const VEInstrInfo &TII =
+      *static_cast<const VEInstrInfo *>(MF.getSubtarget().getInstrInfo());
+  // Insert following codes here as epilogue
+  //
+  //    or %sp, 0, %fp
+  //    ld %got, 32(,%sp)
+  //    ld %plt, 24(,%sp)
+  //    ld %lr, 8(,%sp)
+  //    ld %fp, 0(,%sp)
+
+  BuildMI(MBB, MBBI, dl, TII.get(VE::ORri), VE::SX11).addReg(VE::SX9).addImm(0);
+  BuildMI(MBB, MBBI, dl, TII.get(VE::LDSri), VE::SX16)
+      .addReg(VE::SX11)
+      .addImm(32);
+  BuildMI(MBB, MBBI, dl, TII.get(VE::LDSri), VE::SX15)
+      .addReg(VE::SX11)
+      .addImm(24);
+  BuildMI(MBB, MBBI, dl, TII.get(VE::LDSri), VE::SX10)
+      .addReg(VE::SX11)
+      .addImm(8);
+  BuildMI(MBB, MBBI, dl, TII.get(VE::LDSri), VE::SX9)
+      .addReg(VE::SX11)
+      .addImm(0);
+}
+
+void VEFrameLowering::emitSPAdjustment(MachineFunction &MF,
+                                       MachineBasicBlock &MBB,
+                                       MachineBasicBlock::iterator MBBI,
+                                       int NumBytes) const {
+  DebugLoc dl;
+  const VEInstrInfo &TII =
+      *static_cast<const VEInstrInfo *>(MF.getSubtarget().getInstrInfo());
+
+  if (NumBytes >= -64 && NumBytes < 63) {
+    BuildMI(MBB, MBBI, dl, TII.get(VE::ADXri), VE::SX11)
+        .addReg(VE::SX11)
+        .addImm(NumBytes);
+    return;
+  }
+
+  // Emit following codes.  This clobbers SX13 which we always know is
+  // available here.
+  //   lea     %s13,%lo(NumBytes)
+  //   and     %s13,%s13,(32)0
+  //   lea.sl  %sp,%hi(NumBytes)(%sp, %s13)
+  BuildMI(MBB, MBBI, dl, TII.get(VE::LEAzzi), VE::SX13).addImm(LO32(NumBytes));
+  BuildMI(MBB, MBBI, dl, TII.get(VE::ANDrm0), VE::SX13)
+      .addReg(VE::SX13)
+      .addImm(32);
+  BuildMI(MBB, MBBI, dl, TII.get(VE::LEASLrri), VE::SX11)
+      .addReg(VE::SX11)
+      .addReg(VE::SX13)
+      .addImm(HI32(NumBytes));
+}
+
+void VEFrameLowering::emitSPExtend(MachineFunction &MF, MachineBasicBlock &MBB,
+                                   MachineBasicBlock::iterator MBBI,
+                                   int NumBytes) const {
+  DebugLoc dl;
+  const VEInstrInfo &TII =
+      *static_cast<const VEInstrInfo *>(MF.getSubtarget().getInstrInfo());
+
+  // Emit following codes.  It is not possible to insert multiple
+  // BasicBlocks in PEI pass, so we emit two pseudo instructions here.
+  //
+  //   EXTEND_STACK                     // pseudo instrcution
+  //   EXTEND_STACK_GUARD               // pseudo instrcution
+  //
+  // EXTEND_STACK pseudo will be converted by ExpandPostRA pass into
+  // following instructions with multiple basic blocks later.
+  //
+  // thisBB:
+  //   brge.l.t %sp, %sl, sinkBB
+  // syscallBB:
+  //   ld      %s61, 0x18(, %tp)        // load param area
+  //   or      %s62, 0, %s0             // spill the value of %s0
+  //   lea     %s63, 0x13b              // syscall # of grow
+  //   shm.l   %s63, 0x0(%s61)          // store syscall # at addr:0
+  //   shm.l   %sl, 0x8(%s61)           // store old limit at addr:8
+  //   shm.l   %sp, 0x10(%s61)          // store new limit at addr:16
+  //   monc                             // call monitor
+  //   or      %s0, 0, %s62             // restore the value of %s0
+  // sinkBB:
+  //
+  // EXTEND_STACK_GUARD pseudo will be simply eliminated by ExpandPostRA
+  // pass.  This pseudo is required to be at the next of EXTEND_STACK
+  // pseudo in order to protect iteration loop in ExpandPostRA.
+
+  BuildMI(MBB, MBBI, dl, TII.get(VE::EXTEND_STACK));
+  BuildMI(MBB, MBBI, dl, TII.get(VE::EXTEND_STACK_GUARD));
+}
+
+void VEFrameLowering::emitPrologue(MachineFunction &MF,
+                                   MachineBasicBlock &MBB) const {
+  assert(&MF.front() == &MBB && "Shrink-wrapping not yet supported");
+  MachineFrameInfo &MFI = MF.getFrameInfo();
+  const VESubtarget &Subtarget = MF.getSubtarget<VESubtarget>();
+  const VEInstrInfo &TII =
+      *static_cast<const VEInstrInfo *>(Subtarget.getInstrInfo());
+  const VERegisterInfo &RegInfo =
+      *static_cast<const VERegisterInfo *>(Subtarget.getRegisterInfo());
+  MachineBasicBlock::iterator MBBI = MBB.begin();
+  // Debug location must be unknown since the first debug location is used
+  // to determine the end of the prologue.
+  DebugLoc dl;
+  bool NeedsStackRealignment = RegInfo.needsStackRealignment(MF);
+
+  // FIXME: unfortunately, returning false from canRealignStack
+  // actually just causes needsStackRealignment to return false,
+  // rather than reporting an error, as would be sensible. This is
+  // poor, but fixing that bogosity is going to be a large project.
+  // For now, just see if it's lied, and report an error here.
+  if (!NeedsStackRealignment && MFI.getMaxAlignment() > getStackAlignment())
+    report_fatal_error("Function \"" + Twine(MF.getName()) +
+                       "\" required "
+                       "stack re-alignment, but LLVM couldn't handle it "
+                       "(probably because it has a dynamic alloca).");
+
+  // Get the number of bytes to allocate from the FrameInfo
+  int NumBytes = (int)MFI.getStackSize();
+  // The VE ABI requires a reserved 176-byte area in the user's stack, starting
+  // at %sp + 16. This is for the callee Register Save Area (RSA).
+  //
+  // We therefore need to add that offset to the total stack size
+  // after all the stack objects are placed by
+  // PrologEpilogInserter calculateFrameObjectOffsets. However, since the stack
+  // needs to be aligned *after* the extra size is added, we need to disable
+  // calculateFrameObjectOffsets's built-in stack alignment, by having
+  // targetHandlesStackFrameRounding return true.
+
+  // Add the extra call frame stack size, if needed. (This is the same
+  // code as in PrologEpilogInserter, but also gets disabled by
+  // targetHandlesStackFrameRounding)
+  if (MFI.adjustsStack() && hasReservedCallFrame(MF))
+    NumBytes += MFI.getMaxCallFrameSize();
+
+  // Adds the VE subtarget-specific spill area to the stack
+  // size. Also ensures target-required alignment.
+  NumBytes = Subtarget.getAdjustedFrameSize(NumBytes);
+
+  // Finally, ensure that the size is sufficiently aligned for the
+  // data on the stack.
+  if (MFI.getMaxAlignment() > 0) {
+    NumBytes = alignTo(NumBytes, MFI.getMaxAlignment());
+  }
+
+  // Update stack size with corrected value.
+  MFI.setStackSize(NumBytes);
+
+  // emit Prologue instructions to save %lr
+  emitPrologueInsns(MF, MBB, MBBI, NumBytes, true);
+
+  // emit stack adjust instructions
+  emitSPAdjustment(MF, MBB, MBBI, -NumBytes);
+
+  // emit stack extend instructions
+  emitSPExtend(MF, MBB, MBBI, -NumBytes);
+
+  unsigned regFP = RegInfo.getDwarfRegNum(VE::SX9, true);
+
+  // Emit ".cfi_def_cfa_register 30".
+  unsigned CFIIndex =
+      MF.addFrameInst(MCCFIInstruction::createDefCfaRegister(nullptr, regFP));
+  BuildMI(MBB, MBBI, dl, TII.get(TargetOpcode::CFI_INSTRUCTION))
+      .addCFIIndex(CFIIndex);
+
+  // Emit ".cfi_window_save".
+  CFIIndex = MF.addFrameInst(MCCFIInstruction::createWindowSave(nullptr));
+  BuildMI(MBB, MBBI, dl, TII.get(TargetOpcode::CFI_INSTRUCTION))
+      .addCFIIndex(CFIIndex);
+}
+
+MachineBasicBlock::iterator VEFrameLowering::eliminateCallFramePseudoInstr(
+    MachineFunction &MF, MachineBasicBlock &MBB,
+    MachineBasicBlock::iterator I) const {
+  if (!hasReservedCallFrame(MF)) {
+    MachineInstr &MI = *I;
+    int Size = MI.getOperand(0).getImm();
+    if (MI.getOpcode() == VE::ADJCALLSTACKDOWN)
+      Size = -Size;
+
+    if (Size)
+      emitSPAdjustment(MF, MBB, I, Size);
+  }
+  return MBB.erase(I);
+}
+
+void VEFrameLowering::emitEpilogue(MachineFunction &MF,
+                                   MachineBasicBlock &MBB) const {
+  MachineBasicBlock::iterator MBBI = MBB.getLastNonDebugInstr();
+  DebugLoc dl = MBBI->getDebugLoc();
+  MachineFrameInfo &MFI = MF.getFrameInfo();
+
+  int NumBytes = (int)MFI.getStackSize();
+
+  // emit Epilogue instructions to restore %lr
+  emitEpilogueInsns(MF, MBB, MBBI, NumBytes, true);
+}
+
+bool VEFrameLowering::hasReservedCallFrame(const MachineFunction &MF) const {
+  // Reserve call frame if there are no variable sized objects on the stack.
+  return !MF.getFrameInfo().hasVarSizedObjects();
+}
+
+// hasFP - Return true if the specified function should have a dedicated frame
+// pointer register.  This is true if the function has variable sized allocas or
+// if frame pointer elimination is disabled.
+bool VEFrameLowering::hasFP(const MachineFunction &MF) const {
+  const TargetRegisterInfo *RegInfo = MF.getSubtarget().getRegisterInfo();
+
+  const MachineFrameInfo &MFI = MF.getFrameInfo();
+  return MF.getTarget().Options.DisableFramePointerElim(MF) ||
+         RegInfo->needsStackRealignment(MF) || MFI.hasVarSizedObjects() ||
+         MFI.isFrameAddressTaken();
+}
+
+int VEFrameLowering::getFrameIndexReference(const MachineFunction &MF, int FI,
+                                            unsigned &FrameReg) const {
+  const VEMachineFunctionInfo *FuncInfo = MF.getInfo<VEMachineFunctionInfo>();
+  assert(FuncInfo->isLeafProc() && "TODO implement for non-leaf procs");
+
+  // Addressable stack objects are accessed using neg. offsets from
+  // %fp, or positive offsets from %sp.
+  int64_t FrameOffset = MF.getFrameInfo().getObjectOffset(FI);
+  FrameReg = VE::SX11; // %sp
+  return FrameOffset + MF.getFrameInfo().getStackSize();
+}
+
+bool VEFrameLowering::isLeafProc(MachineFunction &MF) const {
+
+  MachineRegisterInfo &MRI = MF.getRegInfo();
+  MachineFrameInfo &MFI = MF.getFrameInfo();
+
+  return !(MFI.hasCalls()                 // has calls
+           || MRI.isPhysRegUsed(VE::SX18) // Too many registers needed
+                                          //   (s18 is first CSR)
+           || MRI.isPhysRegUsed(VE::SX11) // %sp is used
+           || hasFP(MF));                 // need %fp
+}
+
+void VEFrameLowering::determineCalleeSaves(MachineFunction &MF,
+                                           BitVector &SavedRegs,
+                                           RegScavenger *RS) const {
+  TargetFrameLowering::determineCalleeSaves(MF, SavedRegs, RS);
+
+  assert(isLeafProc(MF) && "TODO implement for non-leaf procs");
+  VEMachineFunctionInfo *MFI = MF.getInfo<VEMachineFunctionInfo>();
+  MFI->setLeafProc(true);
+}

llvm/lib/Target/VE/VEISelDAGToDAG.cpp

+//===-- VEISelDAGToDAG.cpp - A dag to dag inst selector for VE ------------===//
+//
+// 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
+//
+//===----------------------------------------------------------------------===//
+//
+// This file defines an instruction selector for the VE target.
+//
+//===----------------------------------------------------------------------===//
+
+#include "VETargetMachine.h"
+#include "llvm/CodeGen/MachineRegisterInfo.h"
+#include "llvm/CodeGen/SelectionDAGISel.h"
+#include "llvm/IR/Intrinsics.h"
+#include "llvm/Support/Debug.h"
+#include "llvm/Support/ErrorHandling.h"
+#include "llvm/Support/raw_ostream.h"
+using namespace llvm;
+
+//===----------------------------------------------------------------------===//
+// Instruction Selector Implementation
+//===----------------------------------------------------------------------===//
+
+//===--------------------------------------------------------------------===//
+/// VEDAGToDAGISel - VE specific code to select VE machine
+/// instructions for SelectionDAG operations.
+///
+namespace {
+class VEDAGToDAGISel : public SelectionDAGISel {
+  /// Subtarget - Keep a pointer to the VE Subtarget around so that we can
+  /// make the right decision when generating code for different targets.
+  const VESubtarget *Subtarget;
+
+public:
+  explicit VEDAGToDAGISel(VETargetMachine &tm) : SelectionDAGISel(tm) {}
+
+  bool runOnMachineFunction(MachineFunction &MF) override {
+    Subtarget = &MF.getSubtarget<VESubtarget>();
+    return SelectionDAGISel::runOnMachineFunction(MF);
+  }
+
+  void Select(SDNode *N) override;
+
+  StringRef getPassName() const override {
+    return "VE DAG->DAG Pattern Instruction Selection";
+  }
+
+  // Include the pieces autogenerated from the target description.
+#include "VEGenDAGISel.inc"
+};
+} // end anonymous namespace
+
+void VEDAGToDAGISel::Select(SDNode *N) {
+  SDLoc dl(N);
+  if (N->isMachineOpcode()) {
+    N->setNodeId(-1);
+    return; // Already selected.
+  }
+
+  SelectCode(N);
+}
+
+/// createVEISelDag - This pass converts a legalized DAG into a
+/// VE-specific DAG, ready for instruction scheduling.
+///
+FunctionPass *llvm::createVEISelDag(VETargetMachine &TM) {
+  return new VEDAGToDAGISel(TM);
+}

llvm/lib/Target/VE/VEISelLowering.h

+//===-- VEISelLowering.h - VE DAG Lowering Interface ------------*- 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
+//
+//===----------------------------------------------------------------------===//
+//
+// This file defines the interfaces that VE uses to lower LLVM code into a
+// selection DAG.
+//
+//===----------------------------------------------------------------------===//
+
+#ifndef LLVM_LIB_TARGET_VE_VEISELLOWERING_H
+#define LLVM_LIB_TARGET_VE_VEISELLOWERING_H
+
+#include "VE.h"
+#include "llvm/CodeGen/TargetLowering.h"
+
+namespace llvm {
+class VESubtarget;
+
+namespace VEISD {
+enum NodeType : unsigned {
+  FIRST_NUMBER = ISD::BUILTIN_OP_END,
+  RET_FLAG, // Return with a flag operand.
+};
+}
+
+class VETargetLowering : public TargetLowering {
+  const VESubtarget *Subtarget;
+
+public:
+  VETargetLowering(const TargetMachine &TM, const VESubtarget &STI);
+
+  const char *getTargetNodeName(unsigned Opcode) const override;
+
+  Register getRegisterByName(const char *RegName, LLT VT,
+                             const MachineFunction &MF) const override;
+
+  /// getSetCCResultType - Return the ISD::SETCC ValueType
+  EVT getSetCCResultType(const DataLayout &DL, LLVMContext &Context,
+                         EVT VT) const override;
+
+  SDValue LowerFormalArguments(SDValue Chain, CallingConv::ID CallConv,
+                               bool isVarArg,
+                               const SmallVectorImpl<ISD::InputArg> &Ins,
+                               const SDLoc &dl, SelectionDAG &DAG,
+                               SmallVectorImpl<SDValue> &InVals) const override;
+
+  bool CanLowerReturn(CallingConv::ID CallConv, MachineFunction &MF,
+                      bool isVarArg,
+                      const SmallVectorImpl<ISD::OutputArg> &ArgsFlags,
+                      LLVMContext &Context) const override;
+  SDValue LowerReturn(SDValue Chain, CallingConv::ID CallConv, bool isVarArg,
+                      const SmallVectorImpl<ISD::OutputArg> &Outs,
+                      const SmallVectorImpl<SDValue> &OutVals, const SDLoc &dl,
+                      SelectionDAG &DAG) const override;
+};
+} // namespace llvm
+
+#endif // VE_ISELLOWERING_H

llvm/lib/Target/VE/VEISelLowering.cpp

+//===-- VEISelLowering.cpp - VE DAG Lowering Implementation ---------------===//
+//
+// 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
+//
+//===----------------------------------------------------------------------===//
+//
+// This file implements the interfaces that VE uses to lower LLVM code into a
+// selection DAG.
+//
+//===----------------------------------------------------------------------===//
+
+#include "VEISelLowering.h"
+#include "VEMachineFunctionInfo.h"
+#include "VERegisterInfo.h"
+#include "VETargetMachine.h"
+#include "llvm/ADT/StringSwitch.h"
+#include "llvm/CodeGen/CallingConvLower.h"
+#include "llvm/CodeGen/MachineFrameInfo.h"
+#include "llvm/CodeGen/MachineFunction.h"
+#include "llvm/CodeGen/MachineInstrBuilder.h"
+#include "llvm/CodeGen/MachineModuleInfo.h"
+#include "llvm/CodeGen/MachineRegisterInfo.h"
+#include "llvm/CodeGen/SelectionDAG.h"
+#include "llvm/CodeGen/TargetLoweringObjectFileImpl.h"
+#include "llvm/IR/DerivedTypes.h"
+#include "llvm/IR/Function.h"
+#include "llvm/IR/Module.h"
+#include "llvm/Support/ErrorHandling.h"
+#include "llvm/Support/KnownBits.h"
+using namespace llvm;
+
+#define DEBUG_TYPE "ve-lower"
+
+//===----------------------------------------------------------------------===//
+// Calling Convention Implementation
+//===----------------------------------------------------------------------===//
+
+#include "VEGenCallingConv.inc"
+
+bool VETargetLowering::CanLowerReturn(
+    CallingConv::ID CallConv, MachineFunction &MF, bool IsVarArg,
+    const SmallVectorImpl<ISD::OutputArg> &Outs, LLVMContext &Context) const {
+  assert(!IsVarArg && "TODO implement var args");
+  assert(Outs.empty() && "TODO implement return values");
+  return true; // TODO support more than 'ret void'
+}
+
+SDValue
+VETargetLowering::LowerReturn(SDValue Chain, CallingConv::ID CallConv,
+                              bool IsVarArg,
+                              const SmallVectorImpl<ISD::OutputArg> &Outs,
+                              const SmallVectorImpl<SDValue> &OutVals,
+                              const SDLoc &DL, SelectionDAG &DAG) const {
+  assert(!IsVarArg && "TODO implement var args");
+  assert(Outs.empty() && "TODO implement return values");
+  assert(OutVals.empty() && "TODO implement return values");
+
+  // SDValue Flag;
+  SmallVector<SDValue, 4> RetOps(1, Chain);
+  RetOps[0] = Chain; // Update chain.
+  return DAG.getNode(VEISD::RET_FLAG, DL, MVT::Other, RetOps);
+}
+
+SDValue VETargetLowering::LowerFormalArguments(
+    SDValue Chain, CallingConv::ID CallConv, bool IsVarArg,
+    const SmallVectorImpl<ISD::InputArg> &Ins, const SDLoc &DL,
+    SelectionDAG &DAG, SmallVectorImpl<SDValue> &InVals) const {
+  assert(!IsVarArg && "TODO implement var args");
+  assert(Ins.empty() && "TODO implement input arguments");
+  return Chain;
+}
+
+// FIXME? Maybe this could be a TableGen attribute on some registers and
+// this table could be generated automatically from RegInfo.
+Register VETargetLowering::getRegisterByName(const char *RegName, LLT VT,
+                                             const MachineFunction &MF) const {
+  unsigned Reg = StringSwitch<unsigned>(RegName)
+                     .Case("sp", VE::SX11)    // Stack pointer
+                     .Case("fp", VE::SX9)     // Frame pointer
+                     .Case("sl", VE::SX8)     // Stack limit
+                     .Case("lr", VE::SX10)    // Link regsiter
+                     .Case("tp", VE::SX14)    // Thread pointer
+                     .Case("outer", VE::SX12) // Outer regiser
+                     .Case("info", VE::SX17)  // Info area register
+                     .Case("got", VE::SX15)   // Global offset table register
+                     .Case("plt", VE::SX16) // Procedure linkage table register
+                     .Default(0);
+
+  if (Reg)
+    return Reg;
+
+  report_fatal_error("Invalid register name global variable");
+}
+
+//===----------------------------------------------------------------------===//
+// TargetLowering Implementation
+//===----------------------------------------------------------------------===//
+
+VETargetLowering::VETargetLowering(const TargetMachine &TM,
+                                   const VESubtarget &STI)
+    : TargetLowering(TM), Subtarget(&STI) {
+  // Instructions which use registers as conditionals examine all the
+  // bits (as does the pseudo SELECT_CC expansion). I don't think it
+  // matters much whether it's ZeroOrOneBooleanContent, or
+  // ZeroOrNegativeOneBooleanContent, so, arbitrarily choose the
+  // former.
+  setBooleanContents(ZeroOrOneBooleanContent);
+  setBooleanVectorContents(ZeroOrOneBooleanContent);
+
+  // Set up the register classes.
+  addRegisterClass(MVT::i64, &VE::I64RegClass);
+
+  setStackPointerRegisterToSaveRestore(VE::SX11);
+
+  // Set function alignment to 16 bytes
+  setMinFunctionAlignment(Align(16));
+
+  // VE stores all argument by 8 bytes alignment
+  setMinStackArgumentAlignment(Align(8));
+
+  computeRegisterProperties(Subtarget->getRegisterInfo());
+}
+
+const char *VETargetLowering::getTargetNodeName(unsigned Opcode) const {
+  switch ((VEISD::NodeType)Opcode) {
+  case VEISD::FIRST_NUMBER:
+    break;
+  case VEISD::RET_FLAG:
+    return "VEISD::RET_FLAG";
+  }
+  return nullptr;
+}
+
+EVT VETargetLowering::getSetCCResultType(const DataLayout &, LLVMContext &,
+                                         EVT VT) const {
+  return MVT::i64;
+}

llvm/lib/Target/VE/VEInstrFormats.td

+//===-- VEInstrFormats.td - VE Instruction Formats ---------*- tablegen -*-===//
+//
+// 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
+//
+//===----------------------------------------------------------------------===//
+
+class InstVE<dag outs, dag ins, string asmstr, list<dag> pattern>
+   : Instruction {
+  field bits<64> Inst;
+
+  let Namespace = "VE";
+  let Size = 8;
+
+  bits<8> op;
+  let Inst{0-7} = op;
+
+  dag OutOperandList = outs;
+  dag InOperandList = ins;
+  let AsmString   = asmstr;
+  let Pattern = pattern;
+
+  let DecoderNamespace = "VE";
+  field bits<64> SoftFail = 0;
+}
+
+class RM<bits<8>opVal, dag outs, dag ins, string asmstr, list<dag> pattern=[]>
+   : InstVE<outs, ins, asmstr, pattern> {
+  bits<1>  cx = 0;
+  bits<7>  sx;
+  bits<1>  cy = 0;
+  bits<7>  sy;
+  bits<1>  cz = 0;
+  bits<7>  sz;
+  bits<32> imm32 = 0;
+  let op = opVal;
+  let Inst{15} = cx;
+  let Inst{14-8} = sx;
+  let Inst{23} = cy;
+  let Inst{22-16} = sy;
+  let Inst{31} = cz;
+  let Inst{30-24} = sz;
+  let Inst{63-32}  = imm32;
+}
+
+class RR<bits<8>opVal, dag outs, dag ins, string asmstr>
+   : RM<opVal, outs, ins, asmstr> {
+  bits<1> cw = 0;
+  bits<1> cw2 = 0;
+  bits<4> cfw = 0;
+  let imm32{0-23} = 0;
+  let imm32{24} = cw;
+  let imm32{25} = cw2;
+  let imm32{26-27} = 0;
+  let imm32{28-31} = cfw;
+}
+
+class CF<bits<8>opVal, dag outs, dag ins, string asmstr, list<dag> pattern=[]>
+   : RM<opVal, outs, ins, asmstr, pattern> {
+  bits<1>  cx2;
+  bits<2>  bpf;
+  bits<4>  cf;
+  let cx = 0;
+  let sx{6} = cx2;
+  let sx{5-4} = bpf;
+  let sx{3-0} = cf;
+}
+
+// Pseudo instructions.
+class Pseudo<dag outs, dag ins, string asmstr, list<dag> pattern=[]>
+   : InstVE<outs, ins, asmstr, pattern> {
+  let isCodeGenOnly = 1;
+  let isPseudo = 1;
+}

llvm/lib/Target/VE/VEInstrInfo.h

+//===-- VEInstrInfo.h - VE Instruction Information --------------*- 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
+//
+//===----------------------------------------------------------------------===//
+//
+// This file contains the VE implementation of the TargetInstrInfo class.
+//
+//===----------------------------------------------------------------------===//
+
+#ifndef LLVM_LIB_TARGET_VE_VEINSTRINFO_H
+#define LLVM_LIB_TARGET_VE_VEINSTRINFO_H
+
+#include "VERegisterInfo.h"
+#include "llvm/CodeGen/TargetInstrInfo.h"
+
+#define GET_INSTRINFO_HEADER
+#include "VEGenInstrInfo.inc"
+
+namespace llvm {
+
+class VESubtarget;
+
+class VEInstrInfo : public VEGenInstrInfo {
+  const VERegisterInfo RI;
+  const VESubtarget &Subtarget;
+  virtual void anchor();
+
+public:
+  explicit VEInstrInfo(VESubtarget &ST);
+
+  /// getRegisterInfo - TargetInstrInfo is a superset of MRegister info.  As
+  /// such, whenever a client has an instance of instruction info, it should
+  /// always be able to get register info as well (through this method).
+  ///
+  const VERegisterInfo &getRegisterInfo() const { return RI; }
+
+  unsigned getGlobalBaseReg(MachineFunction *MF) const;
+
+  // Lower pseudo instructions after register allocation.
+  bool expandPostRAPseudo(MachineInstr &MI) const override;
+
+  bool expandExtendStackPseudo(MachineInstr &MI) const;
+};
+
+} // namespace llvm
+
+#endif

llvm/lib/Target/VE/VEInstrInfo.cpp

+//===-- VEInstrInfo.cpp - VE Instruction Information ----------------------===//
+//
+// 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
+//
+//===----------------------------------------------------------------------===//
+//
+// This file contains the VE implementation of the TargetInstrInfo class.
+//
+//===----------------------------------------------------------------------===//
+
+#include "VEInstrInfo.h"
+#include "VE.h"
+#include "VEMachineFunctionInfo.h"
+#include "VESubtarget.h"
+#include "llvm/ADT/STLExtras.h"
+#include "llvm/ADT/SmallVector.h"
+#include "llvm/CodeGen/MachineFrameInfo.h"
+#include "llvm/CodeGen/MachineInstrBuilder.h"
+#include "llvm/CodeGen/MachineMemOperand.h"
+#include "llvm/CodeGen/MachineRegisterInfo.h"
+#include "llvm/Support/CommandLine.h"
+#include "llvm/Support/Debug.h"
+#include "llvm/Support/ErrorHandling.h"
+#include "llvm/Support/TargetRegistry.h"
+
+#define DEBUG_TYPE "ve"
+
+using namespace llvm;
+
+#define GET_INSTRINFO_CTOR_DTOR
+#include "VEGenInstrInfo.inc"
+
+// Pin the vtable to this file.
+void VEInstrInfo::anchor() {}
+
+VEInstrInfo::VEInstrInfo(VESubtarget &ST)
+    : VEGenInstrInfo(VE::ADJCALLSTACKDOWN, VE::ADJCALLSTACKUP), RI(),
+      Subtarget(ST) {}
+
+bool VEInstrInfo::expandPostRAPseudo(MachineInstr &MI) const {
+  switch (MI.getOpcode()) {
+  case VE::EXTEND_STACK: {
+    return expandExtendStackPseudo(MI);
+  }
+  case VE::EXTEND_STACK_GUARD: {
+    MI.eraseFromParent(); // The pseudo instruction is gone now.
+    return true;
+  }
+  }
+  return false;
+}
+
+bool VEInstrInfo::expandExtendStackPseudo(MachineInstr &MI) const {
+  MachineBasicBlock &MBB = *MI.getParent();
+  MachineFunction &MF = *MBB.getParent();
+  const VEInstrInfo &TII =
+      *static_cast<const VEInstrInfo *>(MF.getSubtarget().getInstrInfo());
+  DebugLoc dl = MBB.findDebugLoc(MI);
+
+  // Create following instructions and multiple basic blocks.
+  //
+  // thisBB:
+  //   brge.l.t %sp, %sl, sinkBB
+  // syscallBB:
+  //   ld      %s61, 0x18(, %tp)        // load param area
+  //   or      %s62, 0, %s0             // spill the value of %s0
+  //   lea     %s63, 0x13b              // syscall # of grow
+  //   shm.l   %s63, 0x0(%s61)          // store syscall # at addr:0
+  //   shm.l   %sl, 0x8(%s61)           // store old limit at addr:8
+  //   shm.l   %sp, 0x10(%s61)          // store new limit at addr:16
+  //   monc                             // call monitor
+  //   or      %s0, 0, %s62             // restore the value of %s0
+  // sinkBB:
+
+  // Create new MBB
+  MachineBasicBlock *BB = &MBB;
+  const BasicBlock *LLVM_BB = BB->getBasicBlock();
+  MachineBasicBlock *syscallMBB = MF.CreateMachineBasicBlock(LLVM_BB);
+  MachineBasicBlock *sinkMBB = MF.CreateMachineBasicBlock(LLVM_BB);
+  MachineFunction::iterator It = ++(BB->getIterator());
+  MF.insert(It, syscallMBB);
+  MF.insert(It, sinkMBB);
+
+  // Transfer the remainder of BB and its successor edges to sinkMBB.
+  sinkMBB->splice(sinkMBB->begin(), BB,
+                  std::next(std::next(MachineBasicBlock::iterator(MI))),
+                  BB->end());
+  sinkMBB->transferSuccessorsAndUpdatePHIs(BB);
+
+  // Next, add the true and fallthrough blocks as its successors.
+  BB->addSuccessor(syscallMBB);
+  BB->addSuccessor(sinkMBB);
+  BuildMI(BB, dl, TII.get(VE::BCRLrr))
+      .addImm(VECC::CC_IGE)
+      .addReg(VE::SX11) // %sp
+      .addReg(VE::SX8)  // %sl
+      .addMBB(sinkMBB);
+
+  BB = syscallMBB;
+
+  // Update machine-CFG edges
+  BB->addSuccessor(sinkMBB);
+
+  BuildMI(BB, dl, TII.get(VE::LDSri), VE::SX61).addReg(VE::SX14).addImm(0x18);
+  BuildMI(BB, dl, TII.get(VE::ORri), VE::SX62).addReg(VE::SX0).addImm(0);
+  BuildMI(BB, dl, TII.get(VE::LEAzzi), VE::SX63).addImm(0x13b);
+  BuildMI(BB, dl, TII.get(VE::SHMri))
+      .addReg(VE::SX61)
+      .addImm(0)
+      .addReg(VE::SX63);
+  BuildMI(BB, dl, TII.get(VE::SHMri))
+      .addReg(VE::SX61)
+      .addImm(8)
+      .addReg(VE::SX8);
+  BuildMI(BB, dl, TII.get(VE::SHMri))
+      .addReg(VE::SX61)
+      .addImm(16)
+      .addReg(VE::SX11);
+  BuildMI(BB, dl, TII.get(VE::MONC));
+
+  BuildMI(BB, dl, TII.get(VE::ORri), VE::SX0).addReg(VE::SX62).addImm(0);
+
+  MI.eraseFromParent(); // The pseudo instruction is gone now.
+  return true;
+}

llvm/lib/Target/VE/VEInstrInfo.td

+//===-- VEInstrInfo.td - Target Description for VE Target -----------------===//
+//
+// 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
+//
+//===----------------------------------------------------------------------===//
+//
+// This file describes the VE instructions in TableGen format.
+//
+//===----------------------------------------------------------------------===//
+
+//===----------------------------------------------------------------------===//
+// Instruction format superclass
+//===----------------------------------------------------------------------===//
+
+include "VEInstrFormats.td"
+
+//===----------------------------------------------------------------------===//
+// Feature predicates.
+//===----------------------------------------------------------------------===//
+
+//===----------------------------------------------------------------------===//
+// Instruction Pattern Stuff
+//===----------------------------------------------------------------------===//
+
+def simm7       : PatLeaf<(imm), [{ return isInt<7>(N->getSExtValue()); }]>;
+def simm32      : PatLeaf<(imm), [{ return isInt<32>(N->getSExtValue()); }]>;
+def uimm6       : PatLeaf<(imm), [{ return isUInt<6>(N->getZExtValue()); }]>;
+def LO32 : SDNodeXForm<imm, [{
+  return CurDAG->getTargetConstant((unsigned)(N->getZExtValue() & 0xffffffff),
+                                   SDLoc(N), MVT::i32);
+}]>;
+
+def HI32 : SDNodeXForm<imm, [{
+  // Transformation function: shift the immediate value down into the low bits.
+  return CurDAG->getTargetConstant((unsigned)(N->getZExtValue() >> 32),
+                                   SDLoc(N), MVT::i32);
+}]>;
+
+// ASX format of memory address
+def MEMri : Operand<iPTR> {
+  let PrintMethod = "printMemASXOperand";
+  let MIOperandInfo = (ops ptr_rc, i64imm);
+}
+
+// AS format of memory address
+def MEMASri : Operand<iPTR> {
+  let PrintMethod = "printMemASOperand";
+  let MIOperandInfo = (ops ptr_rc, i64imm);
+}
+
+// Branch targets have OtherVT type.
+def brtarget32 : Operand<OtherVT> {
+  let EncoderMethod = "getBranchTarget32OpValue";
+}
+
+def simm7Op64 : Operand<i64> {
+  let DecoderMethod = "DecodeSIMM7";
+}
+
+def simm32Op64 : Operand<i64> {
+  let DecoderMethod = "DecodeSIMM32";
+}
+
+def uimm6Op64 : Operand<i64> {
+  let DecoderMethod = "DecodeUIMM6";
+}
+
+// Operand for printing out a condition code.
+let PrintMethod = "printCCOperand" in
+  def CCOp : Operand<i32>;
+
+//  These are target-independent nodes, but have target-specific formats.
+def SDT_SPCallSeqStart : SDCallSeqStart<[ SDTCisVT<0, i64>,
+                                          SDTCisVT<1, i64> ]>;
+def SDT_SPCallSeqEnd   : SDCallSeqEnd<[ SDTCisVT<0, i64>,
+                                        SDTCisVT<1, i64> ]>;
+
+def callseq_start : SDNode<"ISD::CALLSEQ_START", SDT_SPCallSeqStart,
+                           [SDNPHasChain, SDNPOutGlue]>;
+def callseq_end   : SDNode<"ISD::CALLSEQ_END",   SDT_SPCallSeqEnd,
+                           [SDNPHasChain, SDNPOptInGlue, SDNPOutGlue]>;
+
+// def SDT_SPCall    : SDTypeProfile<0, -1, [SDTCisVT<0, i64>]>;
+
+def retflag       : SDNode<"VEISD::RET_FLAG", SDTNone,
+                           [SDNPHasChain, SDNPOptInGlue, SDNPVariadic]>;
+//===----------------------------------------------------------------------===//
+// VE Flag Conditions
+//===----------------------------------------------------------------------===//
+
+// Note that these values must be kept in sync with the CCOp::CondCode enum
+// values.
+class CC_VAL<int N> : PatLeaf<(i32 N)>;
+def CC_IG    : CC_VAL< 0>;  // Greater
+def CC_IL    : CC_VAL< 1>;  // Less
+def CC_INE   : CC_VAL< 2>;  // Not Equal
+def CC_IEQ   : CC_VAL< 3>;  // Equal
+def CC_IGE   : CC_VAL< 4>;  // Greater or Equal
+def CC_ILE   : CC_VAL< 5>;  // Less or Equal
+def CC_AF    : CC_VAL< 6>;  // Always false
+def CC_G     : CC_VAL< 7>;  // Greater
+def CC_L     : CC_VAL< 8>;  // Less
+def CC_NE    : CC_VAL< 9>;  // Not Equal
+def CC_EQ    : CC_VAL<10>;  // Equal
+def CC_GE    : CC_VAL<11>;  // Greater or Equal
+def CC_LE    : CC_VAL<12>;  // Less or Equal
+def CC_NUM   : CC_VAL<13>;  // Number
+def CC_NAN   : CC_VAL<14>;  // NaN
+def CC_GNAN  : CC_VAL<15>;  // Greater or NaN
+def CC_LNAN  : CC_VAL<16>;  // Less or NaN
+def CC_NENAN : CC_VAL<17>;  // Not Equal or NaN
+def CC_EQNAN : CC_VAL<18>;  // Equal or NaN
+def CC_GENAN : CC_VAL<19>;  // Greater or Equal or NaN
+def CC_LENAN : CC_VAL<20>;  // Less or Equal or NaN
+def CC_AT    : CC_VAL<21>;  // Always true
+
+//===----------------------------------------------------------------------===//
+// VE Multiclasses for common instruction formats
+//===----------------------------------------------------------------------===//
+
+multiclass RMm<string opcStr, bits<8>opc,
+               RegisterClass RC, ValueType Ty, Operand immOp, Operand immOp2> {
+  def rri : RM<
+    opc, (outs RC:$sx), (ins RC:$sy, RC:$sz, immOp2:$imm32),
+    !strconcat(opcStr, " $sx, ${imm32}($sy, ${sz})")> {
+    let cy = 1;
+    let cz = 1;
+    let hasSideEffects = 0;
+  }
+  def zzi : RM<
+    opc, (outs RC:$sx), (ins immOp2:$imm32),
+    !strconcat(opcStr, " $sx, $imm32")> {
+    let cy = 0;
+    let sy = 0;
+    let cz = 0;
+    let sz = 0;
+    let hasSideEffects = 0;
+  }
+}
+
+// Multiclass for RR type instructions
+
+multiclass RRmrr<string opcStr, bits<8>opc,
+                 RegisterClass RCo, ValueType Tyo,
+                 RegisterClass RCi, ValueType Tyi> {
+  def rr : RR<opc, (outs RCo:$sx), (ins RCi:$sy, RCi:$sz),
+              !strconcat(opcStr, " $sx, $sy, $sz")>
+           { let cy = 1; let cz = 1; let hasSideEffects = 0; }
+}
+
+multiclass RRmri<string opcStr, bits<8>opc,
+                 RegisterClass RCo, ValueType Tyo,
+                 RegisterClass RCi, ValueType Tyi, Operand immOp> {
+  // VE calculates (OpNode $sy, $sz), but llvm requires to have immediate
+  // in RHS, so we use following definition.
+  def ri : RR<opc, (outs RCo:$sx), (ins RCi:$sz, immOp:$sy),
+              !strconcat(opcStr, " $sx, $sy, $sz")>
+           { let cy = 0; let cz = 1; let hasSideEffects = 0; }
+}
+
+multiclass RRmiz<string opcStr, bits<8>opc,
+                 RegisterClass RCo, ValueType Tyo,
+                 RegisterClass RCi, ValueType Tyi, Operand immOp> {
+  def zi : RR<opc, (outs RCo:$sx), (ins immOp:$sy),
+              !strconcat(opcStr, " $sx, $sy")>
+           { let cy = 0; let cz = 0; let sz = 0; let hasSideEffects = 0; }
+}
+
+multiclass RRNDmrm<string opcStr, bits<8>opc,
+                   RegisterClass RCo, ValueType Tyo,
+                   RegisterClass RCi, ValueType Tyi, Operand immOp2> {
+  def rm0 : RR<opc, (outs RCo:$sx), (ins RCi:$sy, immOp2:$sz),
+               !strconcat(opcStr, " $sx, $sy, (${sz})0")> {
+              let cy = 1;
+              let cz = 0;
+              let sz{6} = 1;
+              // (guess) tblgen conservatively assumes hasSideEffects when
+              // it fails to infer from a pattern.
+              let hasSideEffects = 0;
+            }
+}
+
+// Used by add, mul, div, and similar commutative instructions
+//   The order of operands are "$sx, $sy, $sz"
+
+multiclass RRm<string opcStr, bits<8>opc,
+               RegisterClass RC, ValueType Ty, Operand immOp, Operand immOp2> :
+  RRmrr<opcStr, opc, RC, Ty, RC, Ty>,
+  RRmri<opcStr, opc, RC, Ty, RC, Ty, immOp>,
+  RRmiz<opcStr, opc, RC, Ty, RC, Ty, immOp>,
+  RRNDmrm<opcStr, opc, RC, Ty, RC, Ty, immOp2>;
+
+// Branch multiclass
+let isBranch = 1, isTerminator = 1, hasDelaySlot = 1 in
+multiclass BCRm<string opcStr, string opcStrAt, bits<8> opc,
+                RegisterClass RC, ValueType Ty, Operand immOp, Operand immOp2> {
+  def rr : CF<
+    opc, (outs),
+    (ins CCOp:$cf, RC:$sy, RC:$sz, brtarget32:$imm32),
+    !strconcat(opcStr, " $sy, $sz, $imm32")> {
+    let cy = 1;
+    let cz = 1;
+    let hasSideEffects = 0;
+  }
+}
+
+
+//===----------------------------------------------------------------------===//
+// Instructions
+//===----------------------------------------------------------------------===//
+
+// LEA and LEASL instruction (load 32 bit imm to low or high part)
+let cx = 0 in
+defm LEA : RMm<"lea", 0x06, I64, i64, simm7Op64, simm32Op64>;
+let cx = 1 in
+defm LEASL : RMm<"lea.sl", 0x06, I64, i64, simm7Op64, simm32Op64>;
+
+// 5.3.2.2. Fixed-Point Arithmetic Operation Instructions
+
+// ADX instruction
+let cx = 0 in
+defm ADX : RRm<"adds.l", 0x59, I64, i64, simm7Op64, uimm6Op64>;
+
+// 5.3.2.3. Logical Arithmetic Operation Instructions
+
+let cx = 0 in {
+  defm AND : RRm<"and", 0x44, I64, i64, simm7Op64, uimm6Op64>;
+  defm OR : RRm<"or", 0x45, I64, i64, simm7Op64, uimm6Op64>;
+}
+
+// Load and Store instructions
+// As 1st step, only uses sz and imm32 to represent $addr
+let mayLoad = 1, hasSideEffects = 0 in {
+let cy = 0, sy = 0, cz = 1 in {
+let cx = 0 in
+def LDSri : RM<
+    0x01, (outs I64:$sx), (ins MEMri:$addr),
+    "ld $sx, $addr">;
+}
+}
+
+let mayStore = 1, hasSideEffects = 0 in {
+let cx = 0, cy = 0, sy = 0, cz = 1 in {
+def STSri : RM<
+    0x11, (outs), (ins MEMri:$addr, I64:$sx),
+    "st $sx, $addr">;
+}
+}
+
+// Return instruction is also a special case of jump.
+let cx = 0, cx2 = 0, bpf = 0 /* NONE */, cf = 15 /* AT */, cy = 0, sy = 0,
+    cz = 1, sz = 0x10 /* SX10 */, imm32 = 0, Uses = [SX10],
+    isReturn = 1, isTerminator = 1, hasDelaySlot = 1, isBarrier = 1,
+    isCodeGenOnly = 1, hasSideEffects = 0 in
+def RET : CF<
+    0x19, (outs), (ins),
+    "b.l (,%lr)",
+    [(retflag)]>;
+
+// Branch instruction
+let cx = 0, cx2 = 0, bpf = 0 /* NONE */ in
+defm BCRL : BCRm<"br${cf}.l", "br.l", 0x18, I64, i64, simm7Op64, uimm6Op64>;
+
+let cx = 0, cy = 0, cz = 1, hasSideEffects = 0 in {
+let sy = 3 in
+def SHMri : RM<
+    0x31, (outs), (ins MEMASri:$addr, I64:$sx),
+    "shm.l $sx, $addr">;
+}
+
+let cx = 0, sx = 0, cy = 0, sy = 0, cz = 0, sz = 0, hasSideEffects = 0 in
+def MONC : RR<
+    0x3F, (outs), (ins),
+    "monc">;
+
+//===----------------------------------------------------------------------===//
+// Pseudo Instructions
+//===----------------------------------------------------------------------===//
+
+let Defs = [SX11], Uses = [SX11], hasSideEffects = 0 in {
+def ADJCALLSTACKDOWN : Pseudo<(outs), (ins i64imm:$amt, i64imm:$amt2),
+                              "# ADJCALLSTACKDOWN $amt, $amt2",
+                              [(callseq_start timm:$amt, timm:$amt2)]>;
+def ADJCALLSTACKUP : Pseudo<(outs), (ins i64imm:$amt1, i64imm:$amt2),
+                            "# ADJCALLSTACKUP $amt1",
+                            [(callseq_end timm:$amt1, timm:$amt2)]>;
+}
+
+let Defs = [SX8], Uses = [SX8, SX11], hasSideEffects = 0 in
+def EXTEND_STACK : Pseudo<(outs), (ins),
+                          "# EXTEND STACK",
+                          []>;
+let  hasSideEffects = 0 in
+def EXTEND_STACK_GUARD : Pseudo<(outs), (ins),
+                                "# EXTEND STACK GUARD",
+                                []>;

llvm/lib/Target/VE/VEMCInstLower.cpp

+//===-- VEMCInstLower.cpp - Convert VE MachineInstr to MCInst -------------===//
+//
+// 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
+//
+//===----------------------------------------------------------------------===//
+//
+// This file contains code to lower VE MachineInstrs to their corresponding
+// MCInst records.
+//
+//===----------------------------------------------------------------------===//
+
+#include "VE.h"
+#include "llvm/CodeGen/AsmPrinter.h"
+#include "llvm/CodeGen/MachineFunction.h"
+#include "llvm/CodeGen/MachineInstr.h"
+#include "llvm/CodeGen/MachineOperand.h"
+#include "llvm/IR/Mangler.h"
+#include "llvm/MC/MCAsmInfo.h"
+#include "llvm/MC/MCContext.h"
+#include "llvm/MC/MCExpr.h"
+#include "llvm/MC/MCInst.h"
+
+using namespace llvm;
+
+static MCOperand LowerSymbolOperand(const MachineInstr *MI,
+                                    const MachineOperand &MO,
+                                    const MCSymbol *Symbol, AsmPrinter &AP) {
+
+  const MCSymbolRefExpr *MCSym = MCSymbolRefExpr::create(Symbol, AP.OutContext);
+  return MCOperand::createExpr(MCSym);
+}
+
+static MCOperand LowerOperand(const MachineInstr *MI, const MachineOperand &MO,
+                              AsmPrinter &AP) {
+  switch (MO.getType()) {
+  default:
+    report_fatal_error("unsupported operand type");
+    break;
+
+  case MachineOperand::MO_Register:
+    if (MO.isImplicit())
+      break;
+    return MCOperand::createReg(MO.getReg());
+
+  case MachineOperand::MO_Immediate:
+    return MCOperand::createImm(MO.getImm());
+
+  case MachineOperand::MO_MachineBasicBlock:
+    return LowerSymbolOperand(MI, MO, MO.getMBB()->getSymbol(), AP);
+
+  case MachineOperand::MO_RegisterMask:
+    break;
+  }
+  return MCOperand();
+}
+
+void llvm::LowerVEMachineInstrToMCInst(const MachineInstr *MI, MCInst &OutMI,
+                                       AsmPrinter &AP) {
+  OutMI.setOpcode(MI->getOpcode());
+
+  for (unsigned i = 0, e = MI->getNumOperands(); i != e; ++i) {
+    const MachineOperand &MO = MI->getOperand(i);
+    MCOperand MCOp = LowerOperand(MI, MO, AP);
+
+    if (MCOp.isValid())
+      OutMI.addOperand(MCOp);
+  }
+}

llvm/lib/Target/VE/VEMachineFunctionInfo.h

+//===- VEMachineFunctionInfo.h - VE Machine Function Info -------*- 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
+//
+//===----------------------------------------------------------------------===//
+//
+// This file declares  VE specific per-machine-function information.
+//
+//===----------------------------------------------------------------------===//
+#ifndef LLVM_LIB_TARGET_VE_VEMACHINEFUNCTIONINFO_H
+#define LLVM_LIB_TARGET_VE_VEMACHINEFUNCTIONINFO_H
+
+#include "llvm/CodeGen/MachineFunction.h"
+
+namespace llvm {
+
+class VEMachineFunctionInfo : public MachineFunctionInfo {
+  virtual void anchor();
+
+private:
+  unsigned GlobalBaseReg;
+
+  /// VectorLengthReg - Holds the virtual register for VL register.
+  unsigned VectorLengthReg;
+
+  /// VarArgsFrameOffset - Frame offset to start of varargs area.
+  int VarArgsFrameOffset;
+
+  /// SRetReturnReg - Holds the virtual register into which the sret
+  /// argument is passed.
+  unsigned SRetReturnReg;
+
+  /// IsLeafProc - True if the function is a leaf procedure.
+  bool IsLeafProc;
+
+public:
+  VEMachineFunctionInfo()
+      : GlobalBaseReg(0), VectorLengthReg(0), VarArgsFrameOffset(0),
+        SRetReturnReg(0), IsLeafProc(false) {}
+  explicit VEMachineFunctionInfo(MachineFunction &MF)
+      : GlobalBaseReg(0), VectorLengthReg(0), VarArgsFrameOffset(0),
+        SRetReturnReg(0), IsLeafProc(false) {}
+
+  unsigned getGlobalBaseReg() const { return GlobalBaseReg; }
+  void setGlobalBaseReg(unsigned Reg) { GlobalBaseReg = Reg; }
+
+  unsigned getVectorLengthReg() const { return VectorLengthReg; }
+  void setVectorLengthReg(unsigned Reg) { VectorLengthReg = Reg; }
+
+  int getVarArgsFrameOffset() const { return VarArgsFrameOffset; }
+  void setVarArgsFrameOffset(int Offset) { VarArgsFrameOffset = Offset; }
+
+  unsigned getSRetReturnReg() const { return SRetReturnReg; }
+  void setSRetReturnReg(unsigned Reg) { SRetReturnReg = Reg; }
+
+  void setLeafProc(bool rhs) { IsLeafProc = rhs; }
+  bool isLeafProc() const { return IsLeafProc; }
+};
+} // namespace llvm
+
+#endif

llvm/lib/Target/VE/VEMachineFunctionInfo.cpp

-//===-- VEMCTargetDesc.cpp - VE Target Descriptions -----------------------===//
+//===-- VEMachineFunctionInfo.cpp - VE Machine Function Info --------------===//
 //
 // 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
 //
 //===----------------------------------------------------------------------===//
-//
-// This file provides VE specific target descriptions.
-//
-//===----------------------------------------------------------------------===//
 
-#include "VEMCTargetDesc.h"
+#include "VEMachineFunctionInfo.h"
 
 using namespace llvm;
 
-extern "C" void LLVMInitializeVETargetMC() {
-  // TODO
-}
+void VEMachineFunctionInfo::anchor() {}

llvm/lib/Target/VE/VERegisterInfo.h

+//===-- VERegisterInfo.h - VE Register Information Impl ---------*- 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
+//
+//===----------------------------------------------------------------------===//
+//
+// This file contains the VE implementation of the TargetRegisterInfo class.
+//
+//===----------------------------------------------------------------------===//
+
+#ifndef LLVM_LIB_TARGET_VE_VEREGISTERINFO_H
+#define LLVM_LIB_TARGET_VE_VEREGISTERINFO_H
+
+#include "llvm/CodeGen/TargetRegisterInfo.h"
+
+#define GET_REGINFO_HEADER
+#include "VEGenRegisterInfo.inc"
+
+namespace llvm {
+struct VERegisterInfo : public VEGenRegisterInfo {
+private:
+  // VLS register class's Pressure Set ID.
+  unsigned VLSPSetID;
+
+public:
+  VERegisterInfo();
+
+  /// Code Generation virtual methods...
+  const MCPhysReg *getCalleeSavedRegs(const MachineFunction *MF) const override;
+  const uint32_t *getCallPreservedMask(const MachineFunction &MF,
+                                       CallingConv::ID CC) const override;
+  const uint32_t *getNoPreservedMask() const override;
+
+  BitVector getReservedRegs(const MachineFunction &MF) const override;
+  bool isConstantPhysReg(unsigned PhysReg) const override;
+
+  const TargetRegisterClass *getPointerRegClass(const MachineFunction &MF,
+                                                unsigned Kind) const override;
+
+  void eliminateFrameIndex(MachineBasicBlock::iterator II, int SPAdj,
+                           unsigned FIOperandNum,
+                           RegScavenger *RS = nullptr) const override;
+
+  Register getFrameRegister(const MachineFunction &MF) const override;
+
+  bool canRealignStack(const MachineFunction &MF) const override;
+
+  unsigned getRegPressureSetLimit(const MachineFunction &MF,
+                                  unsigned Idx) const override;
+};
+
+} // namespace llvm
+
+#endif

llvm/lib/Target/VE/VERegisterInfo.cpp

+//===-- VERegisterInfo.cpp - VE Register Information ----------------------===//
+//
+// 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
+//
+//===----------------------------------------------------------------------===//
+//
+// This file contains the VE implementation of the TargetRegisterInfo class.
+//
+//===----------------------------------------------------------------------===//
+
+#include "VERegisterInfo.h"
+#include "VE.h"
+#include "VEMachineFunctionInfo.h"
+#include "VESubtarget.h"
+#include "llvm/ADT/BitVector.h"
+#include "llvm/ADT/STLExtras.h"
+#include "llvm/CodeGen/MachineFrameInfo.h"
+#include "llvm/CodeGen/MachineFunction.h"
+#include "llvm/CodeGen/MachineInstrBuilder.h"
+#include "llvm/CodeGen/MachineRegisterInfo.h"
+#include "llvm/CodeGen/TargetInstrInfo.h"
+#include "llvm/IR/Type.h"
+#include "llvm/Support/CommandLine.h"
+#include "llvm/Support/ErrorHandling.h"
+
+using namespace llvm;
+
+#define GET_REGINFO_TARGET_DESC
+#include "VEGenRegisterInfo.inc"
+
+// VE uses %s10 == %lp to keep return address
+VERegisterInfo::VERegisterInfo() : VEGenRegisterInfo(VE::SX10) {}
+
+const MCPhysReg *
+VERegisterInfo::getCalleeSavedRegs(const MachineFunction *MF) const {
+  return CSR_SaveList;
+}
+
+const uint32_t *VERegisterInfo::getCallPreservedMask(const MachineFunction &MF,
+                                                     CallingConv::ID CC) const {
+  return CSR_RegMask;
+}
+
+const uint32_t *VERegisterInfo::getNoPreservedMask() const {
+  return CSR_NoRegs_RegMask;
+}
+
+BitVector VERegisterInfo::getReservedRegs(const MachineFunction &MF) const {
+  BitVector Reserved(getNumRegs());
+  Reserved.set(VE::SX8);  // stack limit
+  Reserved.set(VE::SX9);  // frame pointer
+  Reserved.set(VE::SX10); // link register (return address)
+  Reserved.set(VE::SX11); // stack pointer
+
+  Reserved.set(VE::SX12); // outer register
+  Reserved.set(VE::SX13); // id register for dynamic linker
+
+  Reserved.set(VE::SX14); // thread pointer
+  Reserved.set(VE::SX15); // global offset table register
+  Reserved.set(VE::SX16); // procedure linkage table register
+  Reserved.set(VE::SX17); // linkage-area register
+
+  // sx18-sx33 are callee-saved registers
+  // sx34-sx63 are temporary registers
+
+  return Reserved;
+}
+
+bool VERegisterInfo::isConstantPhysReg(unsigned PhysReg) const { return false; }
+
+const TargetRegisterClass *
+VERegisterInfo::getPointerRegClass(const MachineFunction &MF,
+                                   unsigned Kind) const {
+  return &VE::I64RegClass;
+}
+
+static void replaceFI(MachineFunction &MF, MachineBasicBlock::iterator II,
+                      MachineInstr &MI, const DebugLoc &dl,
+                      unsigned FIOperandNum, int Offset, unsigned FramePtr) {
+  // Replace frame index with a frame pointer reference directly.
+  // VE has 32 bit offset field, so no need to expand a target instruction.
+  // Directly encode it.
+  MI.getOperand(FIOperandNum).ChangeToRegister(FramePtr, false);
+  MI.getOperand(FIOperandNum + 1).ChangeToImmediate(Offset);
+}
+
+void VERegisterInfo::eliminateFrameIndex(MachineBasicBlock::iterator II,
+                                         int SPAdj, unsigned FIOperandNum,
+                                         RegScavenger *RS) const {
+  assert(SPAdj == 0 && "Unexpected");
+
+  MachineInstr &MI = *II;
+  DebugLoc dl = MI.getDebugLoc();
+  int FrameIndex = MI.getOperand(FIOperandNum).getIndex();
+  MachineFunction &MF = *MI.getParent()->getParent();
+  const VEFrameLowering *TFI = getFrameLowering(MF);
+
+  unsigned FrameReg;
+  int Offset;
+  Offset = TFI->getFrameIndexReference(MF, FrameIndex, FrameReg);
+
+  Offset += MI.getOperand(FIOperandNum + 1).getImm();
+
+  replaceFI(MF, II, MI, dl, FIOperandNum, Offset, FrameReg);
+}
+
+unsigned VERegisterInfo::getRegPressureSetLimit(const MachineFunction &MF,
+                                                unsigned Idx) const {
+  return VEGenRegisterInfo::getRegPressureSetLimit(MF, Idx);
+}
+
+Register VERegisterInfo::getFrameRegister(const MachineFunction &MF) const {
+  return VE::SX9;
+}
+
+// VE has no architectural need for stack realignment support,
+// except that LLVM unfortunately currently implements overaligned
+// stack objects by depending upon stack realignment support.
+// If that ever changes, this can probably be deleted.
+bool VERegisterInfo::canRealignStack(const MachineFunction &MF) const {
+  if (!TargetRegisterInfo::canRealignStack(MF))
+    return false;
+
+  // VE always has a fixed frame pointer register, so don't need to
+  // worry about needing to reserve it. [even if we don't have a frame
+  // pointer for our frame, it still cannot be used for other things,
+  // or register window traps will be SADNESS.]
+
+  // If there's a reserved call frame, we can use VE to access locals.
+  if (getFrameLowering(MF)->hasReservedCallFrame(MF))
+    return true;
+
+  // Otherwise, we'd need a base pointer, but those aren't implemented
+  // for VE at the moment.
+
+  return false;
+}

llvm/lib/Target/VE/VERegisterInfo.td

+//===-- VERegisterInfo.td - VE Register defs ---------------*- tablegen -*-===//
+//
+// 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
+//
+//===----------------------------------------------------------------------===//
+
+//===----------------------------------------------------------------------===//
+//  Declarations that describe the VE register file
+//===----------------------------------------------------------------------===//
+
+class VEReg<bits<7> Enc, string n> : Register<n> {
+  let HWEncoding{15-7} = 0;
+  let HWEncoding{6-0} = Enc;
+  let Namespace = "VE";
+}
+
+// Registers are identified with 7-bit ID numbers.
+// R - 64-bit integer or floating-point registers
+class R<bits<7> Enc, string n, list<Register> subregs = [],
+        list<Register> aliases = []>: VEReg<Enc, n> {
+  let SubRegs = subregs;
+  let Aliases = aliases;
+}
+
+// Generic integer registers - 64 bits wide
+foreach I = 0-63 in
+  def SX#I : R<I, "S"#I, []>,
+             DwarfRegNum<[I]>;
+
+// Register classes.
+//
+// The register order is defined in terms of the preferred
+// allocation order.
+def I64 : RegisterClass<"VE", [i64], 64,
+                        (sequence "SX%u", 0, 63)>;

llvm/lib/Target/VE/VESubtarget.h

+//===-- VESubtarget.h - Define Subtarget for the VE -------------*- 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
+//
+//===----------------------------------------------------------------------===//
+//
+// This file declares the VE specific subclass of TargetSubtargetInfo.
+//
+//===----------------------------------------------------------------------===//
+
+#ifndef LLVM_LIB_TARGET_VE_VESUBTARGET_H
+#define LLVM_LIB_TARGET_VE_VESUBTARGET_H
+
+#include "VEFrameLowering.h"
+#include "VEISelLowering.h"
+#include "VEInstrInfo.h"
+#include "llvm/CodeGen/SelectionDAGTargetInfo.h"
+#include "llvm/CodeGen/TargetFrameLowering.h"
+#include "llvm/CodeGen/TargetSubtargetInfo.h"
+#include "llvm/IR/DataLayout.h"
+#include <string>
+
+#define GET_SUBTARGETINFO_HEADER
+#include "VEGenSubtargetInfo.inc"
+
+namespace llvm {
+class StringRef;
+
+class VESubtarget : public VEGenSubtargetInfo {
+  Triple TargetTriple;
+  virtual void anchor();
+
+  VEInstrInfo InstrInfo;
+  VETargetLowering TLInfo;
+  SelectionDAGTargetInfo TSInfo;
+  VEFrameLowering FrameLowering;
+
+public:
+  VESubtarget(const Triple &TT, const std::string &CPU, const std::string &FS,
+              const TargetMachine &TM);
+
+  const VEInstrInfo *getInstrInfo() const override { return &InstrInfo; }
+  const TargetFrameLowering *getFrameLowering() const override {
+    return &FrameLowering;
+  }
+  const VERegisterInfo *getRegisterInfo() const override {
+    return &InstrInfo.getRegisterInfo();
+  }
+  const VETargetLowering *getTargetLowering() const override { return &TLInfo; }
+  const SelectionDAGTargetInfo *getSelectionDAGInfo() const override {
+    return &TSInfo;
+  }
+
+  bool enableMachineScheduler() const override;
+
+  /// ParseSubtargetFeatures - Parses features string setting specified
+  /// subtarget options.  Definition of function is auto generated by tblgen.
+  void ParseSubtargetFeatures(StringRef CPU, StringRef FS);
+  VESubtarget &initializeSubtargetDependencies(StringRef CPU, StringRef FS);
+
+  /// Given a actual stack size as determined by FrameInfo, this function
+  /// returns adjusted framesize which includes space for register window
+  /// spills and arguments.
+  int getAdjustedFrameSize(int stackSize) const;
+
+  bool isTargetLinux() const { return TargetTriple.isOSLinux(); }
+};
+
+} // namespace llvm
+
+#endif

llvm/lib/Target/VE/VESubtarget.cpp

+//===-- VESubtarget.cpp - VE Subtarget Information ------------------------===//
+//
+// 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
+//
+//===----------------------------------------------------------------------===//
+//
+// This file implements the VE specific subclass of TargetSubtargetInfo.
+//
+//===----------------------------------------------------------------------===//
+
+#include "VESubtarget.h"
+#include "VE.h"
+#include "llvm/Support/MathExtras.h"
+#include "llvm/Support/TargetRegistry.h"
+
+using namespace llvm;
+
+#define DEBUG_TYPE "ve-subtarget"
+
+#define GET_SUBTARGETINFO_TARGET_DESC
+#define GET_SUBTARGETINFO_CTOR
+#include "VEGenSubtargetInfo.inc"
+
+void VESubtarget::anchor() {}
+
+VESubtarget &VESubtarget::initializeSubtargetDependencies(StringRef CPU,
+                                                          StringRef FS) {
+  // Determine default and user specified characteristics
+  std::string CPUName = CPU;
+  if (CPUName.empty())
+    CPUName = "ve";
+
+  // Parse features string.
+  ParseSubtargetFeatures(CPUName, FS);
+
+  return *this;
+}
+
+VESubtarget::VESubtarget(const Triple &TT, const std::string &CPU,
+                         const std::string &FS, const TargetMachine &TM)
+    : VEGenSubtargetInfo(TT, CPU, FS), TargetTriple(TT),
+      InstrInfo(initializeSubtargetDependencies(CPU, FS)), TLInfo(TM, *this),
+      FrameLowering(*this) {}
+
+int VESubtarget::getAdjustedFrameSize(int frameSize) const {
+
+  // VE stack frame:
+  //
+  //         +----------------------------------------+
+  //         | Locals and temporaries                 |
+  //         +----------------------------------------+
+  //         | Parameter area for callee              |
+  // 176(fp) |                                        |
+  //         +----------------------------------------+
+  //         | Register save area (RSA) for callee    |
+  //         |                                        |
+  //  16(fp) |                         20 * 8 bytes   |
+  //         +----------------------------------------+
+  //   8(fp) | Return address                         |
+  //         +----------------------------------------+
+  //   0(fp) | Frame pointer of caller                |
+  // --------+----------------------------------------+--------
+  //         | Locals and temporaries for callee      |
+  //         +----------------------------------------+
+  //         | Parameter area for callee of callee    |
+  //         +----------------------------------------+
+  //  16(sp) | RSA for callee of callee               |
+  //         +----------------------------------------+
+  //   8(sp) | Return address                         |
+  //         +----------------------------------------+
+  //   0(sp) | Frame pointer of callee                |
+  //         +----------------------------------------+
+
+  // RSA frame:
+  //         +----------------------------------------------+
+  // 168(fp) | %s33                                         |
+  //         +----------------------------------------------+
+  //         | %s19...%s32                                  |
+  //         +----------------------------------------------+
+  //  48(fp) | %s18                                         |
+  //         +----------------------------------------------+
+  //  40(fp) | Linkage area register (%s17)                 |
+  //         +----------------------------------------------+
+  //  32(fp) | Procedure linkage table register (%plt=%s16) |
+  //         +----------------------------------------------+
+  //  24(fp) | Global offset table register (%got=%s15)     |
+  //         +----------------------------------------------+
+  //  16(fp) | Thread pointer register (%tp=%s14)           |
+  //         +----------------------------------------------+
+
+  frameSize += 176;                   // for RSA, RA, and FP
+  frameSize = alignTo(frameSize, 16); // requires 16 bytes alignment
+
+  return frameSize;
+}
+
+bool VESubtarget::enableMachineScheduler() const { return true; }

llvm/lib/Target/VE/VETargetMachine.h

 //===-- VETargetMachine.h - Define TargetMachine for VE ---------*- 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
 //
 //===----------------------------------------------------------------------===//
 //
 // This file declares the VE specific subclass of TargetMachine.
 //
 //===----------------------------------------------------------------------===//
 
 #ifndef LLVM_LIB_TARGET_VE_VETARGETMACHINE_H
 #define LLVM_LIB_TARGET_VE_VETARGETMACHINE_H
 
+#include "VEInstrInfo.h"
+#include "VESubtarget.h"
 #include "llvm/Target/TargetMachine.h"
 
 namespace llvm {
 
 class VETargetMachine : public LLVMTargetMachine {
+  std::unique_ptr<TargetLoweringObjectFile> TLOF;
+  VESubtarget Subtarget;
+  // Hold Strings that can be free'd all together with VETargetMachine
+  //   e.g.: "GCC_except_tableXX" string.
+  std::list<std::string> StrList;
+
 public:
   VETargetMachine(const Target &T, const Triple &TT, StringRef CPU,
                   StringRef FS, const TargetOptions &Options,
                   Optional<Reloc::Model> RM, Optional<CodeModel::Model> CM,
                   CodeGenOpt::Level OL, bool JIT);
   ~VETargetMachine() override;
+
+  const VESubtarget *getSubtargetImpl() const { return &Subtarget; }
+  const VESubtarget *getSubtargetImpl(const Function &) const override {
+    return &Subtarget;
+  }
+  std::list<std::string> *getStrList() const {
+    return const_cast<std::list<std::string> *>(&StrList);
+  }
+
+  // Pass Pipeline Configuration
+  TargetPassConfig *createPassConfig(PassManagerBase &PM) override;
+  TargetLoweringObjectFile *getObjFileLowering() const override {
+    return TLOF.get();
+  }
+
+  bool isMachineVerifierClean() const override { return false; }
+
+  TargetTransformInfo getTargetTransformInfo(const Function &F) override;
 };
 
 } // namespace llvm
 
 #endif

llvm/lib/Target/VE/VETargetMachine.cpp

 //===-- VETargetMachine.cpp - Define TargetMachine for VE -----------------===//
 //
 // 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 "VETargetMachine.h"
 #include "VE.h"
+#include "VETargetTransformInfo.h"
+#include "llvm/CodeGen/Passes.h"
+#include "llvm/CodeGen/TargetLoweringObjectFileImpl.h"
+#include "llvm/CodeGen/TargetPassConfig.h"
+#include "llvm/IR/LegacyPassManager.h"
 #include "llvm/Support/TargetRegistry.h"
 
 using namespace llvm;
 
 #define DEBUG_TYPE "ve"
 
 extern "C" void LLVMInitializeVETarget() {
   // Register the target.

 }
 
 static Reloc::Model getEffectiveRelocModel(Optional<Reloc::Model> RM) {
   if (!RM.hasValue())
     return Reloc::Static;
   return *RM;
 }
 
+class VEELFTargetObjectFile : public TargetLoweringObjectFileELF {
+  void Initialize(MCContext &Ctx, const TargetMachine &TM) override {
+    TargetLoweringObjectFileELF::Initialize(Ctx, TM);
+    InitializeELF(TM.Options.UseInitArray);
+  }
+};
+
+static std::unique_ptr<TargetLoweringObjectFile> createTLOF() {
+  return std::make_unique<VEELFTargetObjectFile>();
+}
+
 /// Create an Aurora VE architecture model
-VETargetMachine::VETargetMachine(
-    const Target &T, const Triple &TT, StringRef CPU, StringRef FS,
-    const TargetOptions &Options, Optional<Reloc::Model> RM,
-    Optional<CodeModel::Model> CM, CodeGenOpt::Level OL, bool JIT)
-    : LLVMTargetMachine(
-          T, computeDataLayout(TT), TT, CPU, FS, Options,
+VETargetMachine::VETargetMachine(const Target &T, const Triple &TT,
+                                 StringRef CPU, StringRef FS,
+                                 const TargetOptions &Options,
+                                 Optional<Reloc::Model> RM,
+                                 Optional<CodeModel::Model> CM,
+                                 CodeGenOpt::Level OL, bool JIT)
+    : LLVMTargetMachine(T, computeDataLayout(TT), TT, CPU, FS, Options,
                         getEffectiveRelocModel(RM),
-          getEffectiveCodeModel(CM, CodeModel::Small),
-          OL)
-{}
+                        getEffectiveCodeModel(CM, CodeModel::Small), OL),
+      TLOF(createTLOF()), Subtarget(TT, CPU, FS, *this) {
+  initAsmInfo();
+}
 
 VETargetMachine::~VETargetMachine() {}
+
+TargetTransformInfo VETargetMachine::getTargetTransformInfo(const Function &F) {
+  return TargetTransformInfo(VETTIImpl(this, F));
+}
+
+namespace {
+/// VE Code Generator Pass Configuration Options.
+class VEPassConfig : public TargetPassConfig {
+public:
+  VEPassConfig(VETargetMachine &TM, PassManagerBase &PM)
+      : TargetPassConfig(TM, PM) {}
+
+  VETargetMachine &getVETargetMachine() const {
+    return getTM<VETargetMachine>();
+  }
+
+  bool addInstSelector() override;
+};
+} // namespace
+
+TargetPassConfig *VETargetMachine::createPassConfig(PassManagerBase &PM) {
+  return new VEPassConfig(*this, PM);
+}
+
+bool VEPassConfig::addInstSelector() {
+  addPass(createVEISelDag(getVETargetMachine()));
+  return false;
+}

llvm/lib/Target/VE/VETargetTransformInfo.h

+//===- VETargetTransformInfo.h - VE specific TTI ------*- 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
+//
+//===----------------------------------------------------------------------===//
+/// \file
+/// This file a TargetTransformInfo::Concept conforming object specific to the
+/// VE target machine. It uses the target's detailed information to
+/// provide more precise answers to certain TTI queries, while letting the
+/// target independent and default TTI implementations handle the rest.
+///
+//===----------------------------------------------------------------------===//
+
+#ifndef LLVM_LIB_TARGET_VE_VETARGETTRANSFORMINFO_H
+#define LLVM_LIB_TARGET_VE_VETARGETTRANSFORMINFO_H
+
+#include "VE.h"
+#include "VETargetMachine.h"
+#include "llvm/Analysis/TargetTransformInfo.h"
+#include "llvm/CodeGen/BasicTTIImpl.h"
+
+namespace llvm {
+
+class VETTIImpl : public BasicTTIImplBase<VETTIImpl> {
+  using BaseT = BasicTTIImplBase<VETTIImpl>;
+  friend BaseT;
+
+  const VESubtarget *ST;
+  const VETargetLowering *TLI;
+
+  const VESubtarget *getST() const { return ST; }
+  const VETargetLowering *getTLI() const { return TLI; }
+
+public:
+  explicit VETTIImpl(const VETargetMachine *TM, const Function &F)
+      : BaseT(TM, F.getParent()->getDataLayout()), ST(TM->getSubtargetImpl(F)),
+        TLI(ST->getTargetLowering()) {}
+
+  unsigned getNumberOfRegisters(unsigned ClassID) const { return 64; }
+
+  unsigned getRegisterBitWidth(bool Vector) const { return 64; }
+
+  unsigned getMinVectorRegisterBitWidth() const { return 64; }
+};
+
+} // namespace llvm
+
+#endif // LLVM_LIB_TARGET_VE_VETARGETTRANSFORMINFO_H

llvm/test/CodeGen/VE/simple_prologue_epilogue.ll

+; RUN: llc < %s -mtriple=ve-unknown-unknown | FileCheck %s
+
+define void @func() {
+; CHECK-LABEL: func:
+; CHECK:       # %bb.0:
+; CHECK-NEXT:  st %s9, (,%s11)
+; CHECK-NEXT:  st %s10, 8(,%s11)
+; CHECK-NEXT:  st %s15, 24(,%s11)
+; CHECK-NEXT:  st %s16, 32(,%s11)
+; CHECK-NEXT:  or %s9, 0, %s11
+; CHECK-NEXT:  lea %s13, -176
+; CHECK-NEXT:  and %s13, %s13, (32)0
+; CHECK-NEXT:  lea.sl %s11, -1(%s11, %s13)
+; CHECK-NEXT:  brge.l %s11, %s8, .LBB0_2
+; CHECK-NEXT:  # %bb.1:
+; CHECK-NEXT:  ld %s61, 24(,%s14)
+; CHECK-NEXT:  or %s62, 0, %s0
+; CHECK-NEXT:  lea %s63, 315
+; CHECK-NEXT:  shm.l %s63, (%s61)
+; CHECK-NEXT:  shm.l %s8, 8(%s61)
+; CHECK-NEXT:  shm.l %s11, 16(%s61)
+; CHECK-NEXT:  monc
+; CHECK-NEXT:  or %s0, 0, %s62
+; CHECK-NEXT: .LBB0_2:
+; CHECK-NEXT:  or %s11, 0, %s9
+; CHECK-NEXT:  ld %s16, 32(,%s11)
+; CHECK-NEXT:  ld %s15, 24(,%s11)
+; CHECK-NEXT:  ld %s10, 8(,%s11)
+; CHECK-NEXT:  ld %s9, (,%s11)
+; CHECK-NEXT:  b.l (,%lr)
+  ret void
+}