<commit_before>//===- AlphaRegisterInfo.cpp - Alpha Register Information ---*- C++ -*-----===//
// 
//                     The LLVM Compiler Infrastructure
//
// This file was developed by the LLVM research group and is distributed under
// the University of Illinois Open Source License. See LICENSE.TXT for details.
// 
//===----------------------------------------------------------------------===//
//
// This file contains the Alpha implementation of the MRegisterInfo class.
//
//===----------------------------------------------------------------------===//

#define DEBUG_TYPE "reginfo"
#include "Alpha.h"
#include "AlphaInstrBuilder.h"
#include "AlphaRegisterInfo.h"
#include "llvm/Constants.h"
#include "llvm/Type.h"
#include "llvm/CodeGen/ValueTypes.h"
#include "llvm/CodeGen/MachineInstrBuilder.h"
#include "llvm/CodeGen/MachineFunction.h"
#include "llvm/CodeGen/MachineFrameInfo.h"
#include "llvm/Target/TargetFrameInfo.h"
#include "llvm/Target/TargetMachine.h"
#include "llvm/Target/TargetOptions.h"
#include "llvm/Support/CommandLine.h"
#include "llvm/Support/Debug.h"
#include "llvm/ADT/STLExtras.h"
#include <cstdlib>
#include <iostream>
using namespace llvm;


AlphaRegisterInfo::AlphaRegisterInfo()
  : AlphaGenRegisterInfo(Alpha::ADJUSTSTACKDOWN, Alpha::ADJUSTSTACKUP)
{
}

static const TargetRegisterClass *getClass(unsigned SrcReg) {
  if (Alpha::FPRCRegisterClass->contains(SrcReg))
    return Alpha::FPRCRegisterClass;
  assert(Alpha::GPRCRegisterClass->contains(SrcReg) && "Reg not FPR or GPR");
  return Alpha::GPRCRegisterClass;
}

void 
AlphaRegisterInfo::storeRegToStackSlot(MachineBasicBlock &MBB,
                                       MachineBasicBlock::iterator MI,
                                       unsigned SrcReg, int FrameIdx) const {
  //std::cerr << "Trying to store " << getPrettyName(SrcReg) << " to " << FrameIdx << "\n";
  //BuildMI(MBB, MI, Alpha::WTF, 0).addReg(SrcReg);
  BuildMI(MBB, MI, Alpha::STQ, 3).addReg(SrcReg).addFrameIndex(FrameIdx);
  //  assert(0 && "TODO");
}

void
AlphaRegisterInfo::loadRegFromStackSlot(MachineBasicBlock &MBB,
                                        MachineBasicBlock::iterator MI,
                                        unsigned DestReg, int FrameIdx) const{
  //std::cerr << "Trying to load " << getPrettyName(DestReg) << " to " << FrameIdx << "\n";
  //BuildMI(MBB, MI, Alpha::WTF, 0, DestReg);
  BuildMI(MBB, MI, Alpha::LDQ, 2, DestReg).addFrameIndex(FrameIdx);
  //  assert(0 && "TODO");
}

void AlphaRegisterInfo::copyRegToReg(MachineBasicBlock &MBB,
                                     MachineBasicBlock::iterator MI,
                                     unsigned DestReg, unsigned SrcReg,
                                     const TargetRegisterClass *RC) const {
  //  std::cerr << "copyRegToReg " << DestReg << " <- " << SrcReg << "\n";
  if (RC == Alpha::GPRCRegisterClass) {
    BuildMI(MBB, MI, Alpha::BIS, 2, DestReg).addReg(SrcReg).addReg(SrcReg);
  } else if (RC == Alpha::FPRCRegisterClass) {
    BuildMI(MBB, MI, Alpha::CPYS, 2, DestReg).addReg(SrcReg).addReg(SrcReg);
  } else { 
    std::cerr << "Attempt to copy register that is not GPR or FPR";
     abort();
  }
}

//===----------------------------------------------------------------------===//
// Stack Frame Processing methods
//===----------------------------------------------------------------------===//

// 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.
//
static bool hasFP(MachineFunction &MF) {
  MachineFrameInfo *MFI = MF.getFrameInfo();
  return MFI->hasVarSizedObjects();
}

void AlphaRegisterInfo::
eliminateCallFramePseudoInstr(MachineFunction &MF, MachineBasicBlock &MBB,
                              MachineBasicBlock::iterator I) const {
  if (hasFP(MF)) {
    assert(0 && "TODO");
    // If we have a frame pointer, turn the adjcallstackup instruction into a
    // 'sub ESP, <amt>' and the adjcallstackdown instruction into 'add ESP,
    // <amt>'
    MachineInstr *Old = I;
    unsigned Amount = Old->getOperand(0).getImmedValue();
    if (Amount != 0) {
      // We need to keep the stack aligned properly.  To do this, we round the
      // amount of space needed for the outgoing arguments up to the next
      // alignment boundary.
      unsigned Align = MF.getTarget().getFrameInfo()->getStackAlignment();
      Amount = (Amount+Align-1)/Align*Align;

      MachineInstr *New;
//       if (Old->getOpcode() == X86::ADJCALLSTACKDOWN) {
// 	New=BuildMI(X86::SUB32ri, 1, X86::ESP, MachineOperand::UseAndDef)
//               .addZImm(Amount);
//       } else {
// 	assert(Old->getOpcode() == X86::ADJCALLSTACKUP);
// 	New=BuildMI(X86::ADD32ri, 1, X86::ESP, MachineOperand::UseAndDef)
//               .addZImm(Amount);
//       }

      // Replace the pseudo instruction with a new instruction...
      MBB.insert(I, New);
    }
  }

  MBB.erase(I);
}

void
AlphaRegisterInfo::eliminateFrameIndex(MachineBasicBlock::iterator II) const {
  assert(0 && "TODO");
//   unsigned i = 0;
//   MachineInstr &MI = *II;
//   MachineBasicBlock &MBB = *MI.getParent();
//   MachineFunction &MF = *MBB.getParent();
  
//   while (!MI.getOperand(i).isFrameIndex()) {
//     ++i;
//     assert(i < MI.getNumOperands() && "Instr doesn't have FrameIndex operand!");
//   }

//   int FrameIndex = MI.getOperand(i).getFrameIndex();

//   // Replace the FrameIndex with base register with GPR1 (SP) or GPR31 (FP).
//   MI.SetMachineOperandReg(i, hasFP(MF) ? PPC::R31 : PPC::R1);

//   // Take into account whether it's an add or mem instruction
//   unsigned OffIdx = (i == 2) ? 1 : 2;

//   // Now add the frame object offset to the offset from r1.
//   int Offset = MF.getFrameInfo()->getObjectOffset(FrameIndex) +
//                MI.getOperand(OffIdx).getImmedValue();

//   // If we're not using a Frame Pointer that has been set to the value of the
//   // SP before having the stack size subtracted from it, then add the stack size
//   // to Offset to get the correct offset.
//   Offset += MF.getFrameInfo()->getStackSize();
  
//   if (Offset > 32767 || Offset < -32768) {
//     // Insert a set of r0 with the full offset value before the ld, st, or add
//     MachineBasicBlock *MBB = MI.getParent();
//     MBB->insert(II, BuildMI(PPC::LIS, 1, PPC::R0).addSImm(Offset >> 16));
//     MBB->insert(II, BuildMI(PPC::ORI, 2, PPC::R0).addReg(PPC::R0)
//       .addImm(Offset));
//     // convert into indexed form of the instruction
//     // sth 0:rA, 1:imm 2:(rB) ==> sthx 0:rA, 2:rB, 1:r0
//     // addi 0:rA 1:rB, 2, imm ==> add 0:rA, 1:rB, 2:r0
//     unsigned NewOpcode = 
//       const_cast<std::map<unsigned, unsigned>& >(ImmToIdxMap)[MI.getOpcode()];
//     assert(NewOpcode && "No indexed form of load or store available!");
//     MI.setOpcode(NewOpcode);
//     MI.SetMachineOperandReg(1, MI.getOperand(i).getReg());
//     MI.SetMachineOperandReg(2, PPC::R0);
//   } else {
//     MI.SetMachineOperandConst(OffIdx, MachineOperand::MO_SignExtendedImmed,
//                               Offset);
//   }
}


void AlphaRegisterInfo::emitPrologue(MachineFunction &MF) const {
  MachineBasicBlock &MBB = MF.front();   // Prolog goes in entry BB
  MachineBasicBlock::iterator MBBI = MBB.begin();
  MachineFrameInfo *MFI = MF.getFrameInfo();
  MachineInstr *MI;
  
  //handle GOP offset
  MI = BuildMI(Alpha::LDGP, 0);
  MBB.insert(MBBI, MI);

  // Get the number of bytes to allocate from the FrameInfo
  unsigned NumBytes = MFI->getStackSize();

  // Do we need to allocate space on the stack?
  if (NumBytes == 0) return;

  // Add the size of R30 to  NumBytes size for the store of R30 to the 
  // stack
//   std::cerr << "Spillsize of R30 is " << getSpillSize(Alpha::R30) << "\n";
//   NumBytes = NumBytes + getSpillSize(Alpha::R30)/8;

  // Update frame info to pretend that this is part of the stack...
  MFI->setStackSize(NumBytes);
  
  // adjust stack pointer: r30 -= numbytes
  
  if (NumBytes <= 32767) {
    MI=BuildMI(Alpha::LDA, 2, Alpha::R30).addImm(-NumBytes).addReg(Alpha::R30);
    MBB.insert(MBBI, MI);
  } else if ((unsigned long)NumBytes <= (unsigned long)32767 * (unsigned long)65536) {
    long y = NumBytes / 65536;
    if (NumBytes % 65536 > 32767)
      ++y;
    MI=BuildMI(Alpha::LDAH, 2, Alpha::R30).addImm(-y).addReg(Alpha::R30);
    MBB.insert(MBBI, MI);
    MI=BuildMI(Alpha::LDA, 2, Alpha::R30).addImm(-(NumBytes - y * 65536)).addReg(Alpha::R30);
    MBB.insert(MBBI, MI);
  } else {
    std::cerr << "Too big a stack frame at " << NumBytes << "\n";
    abort();
  }
}

void AlphaRegisterInfo::emitEpilogue(MachineFunction &MF,
                                     MachineBasicBlock &MBB) const {
  const MachineFrameInfo *MFI = MF.getFrameInfo();
  MachineBasicBlock::iterator MBBI = prior(MBB.end());
  MachineInstr *MI;
  assert((MBBI->getOpcode() == Alpha::RET || MBBI->getOpcode() == Alpha::RETURN) &&
	 "Can only insert epilog into returning blocks");
  
  // Get the number of bytes allocated from the FrameInfo...
  unsigned NumBytes = MFI->getStackSize();

   if (NumBytes != 0) 
     {
       if (NumBytes <= 32767) {
         MI=BuildMI(Alpha::LDA, 2, Alpha::R30).addImm(NumBytes).addReg(Alpha::R30);
         MBB.insert(MBBI, MI);
       } else if ((unsigned long)NumBytes <= (unsigned long)32767 * (unsigned long)65536) {
         long y = NumBytes / 65536;
         if (NumBytes % 65536 > 32767)
           ++y;
         MI=BuildMI(Alpha::LDAH, 2, Alpha::R30).addImm(y).addReg(Alpha::R30);
         MBB.insert(MBBI, MI);
         MI=BuildMI(Alpha::LDA, 2, Alpha::R30).addImm(NumBytes - y * 65536).addReg(Alpha::R30);
         MBB.insert(MBBI, MI);
       } else {
         std::cerr << "Too big a stack frame at " << NumBytes << "\n";
         abort();
       }
     }
}

#include "AlphaGenRegisterInfo.inc"

const TargetRegisterClass*
AlphaRegisterInfo::getRegClassForType(const Type* Ty) const {
  switch (Ty->getTypeID()) {
    default:              assert(0 && "Invalid type to getClass!");
    case Type::BoolTyID:
    case Type::SByteTyID:
    case Type::UByteTyID:
    case Type::ShortTyID:
    case Type::UShortTyID:
    case Type::IntTyID:
    case Type::UIntTyID:
    case Type::PointerTyID:
    case Type::LongTyID:
    case Type::ULongTyID:  return &GPRCInstance;
     
  case Type::FloatTyID:
  case Type::DoubleTyID: return &FPRCInstance;
  }
}

std::string AlphaRegisterInfo::getPrettyName(unsigned reg)
{
  std::string s(RegisterDescriptors[reg].Name);
  return s;
}
<commit_msg>Unbreak the build  :(<commit_after>//===- AlphaRegisterInfo.cpp - Alpha Register Information ---*- C++ -*-----===//
// 
//                     The LLVM Compiler Infrastructure
//
// This file was developed by the LLVM research group and is distributed under
// the University of Illinois Open Source License. See LICENSE.TXT for details.
// 
//===----------------------------------------------------------------------===//
//
// This file contains the Alpha implementation of the MRegisterInfo class.
//
//===----------------------------------------------------------------------===//

#define DEBUG_TYPE "reginfo"
#include "Alpha.h"
#include "AlphaRegisterInfo.h"
#include "llvm/Constants.h"
#include "llvm/Type.h"
#include "llvm/CodeGen/ValueTypes.h"
#include "llvm/CodeGen/MachineInstrBuilder.h"
#include "llvm/CodeGen/MachineFunction.h"
#include "llvm/CodeGen/MachineFrameInfo.h"
#include "llvm/Target/TargetFrameInfo.h"
#include "llvm/Target/TargetMachine.h"
#include "llvm/Target/TargetOptions.h"
#include "llvm/Support/CommandLine.h"
#include "llvm/Support/Debug.h"
#include "llvm/ADT/STLExtras.h"
#include <cstdlib>
#include <iostream>
using namespace llvm;


AlphaRegisterInfo::AlphaRegisterInfo()
  : AlphaGenRegisterInfo(Alpha::ADJUSTSTACKDOWN, Alpha::ADJUSTSTACKUP)
{
}

static const TargetRegisterClass *getClass(unsigned SrcReg) {
  if (Alpha::FPRCRegisterClass->contains(SrcReg))
    return Alpha::FPRCRegisterClass;
  assert(Alpha::GPRCRegisterClass->contains(SrcReg) && "Reg not FPR or GPR");
  return Alpha::GPRCRegisterClass;
}

void 
AlphaRegisterInfo::storeRegToStackSlot(MachineBasicBlock &MBB,
                                       MachineBasicBlock::iterator MI,
                                       unsigned SrcReg, int FrameIdx) const {
  //std::cerr << "Trying to store " << getPrettyName(SrcReg) << " to " << FrameIdx << "\n";
  //BuildMI(MBB, MI, Alpha::WTF, 0).addReg(SrcReg);
  BuildMI(MBB, MI, Alpha::STQ, 3).addReg(SrcReg).addFrameIndex(FrameIdx);
  //  assert(0 && "TODO");
}

void
AlphaRegisterInfo::loadRegFromStackSlot(MachineBasicBlock &MBB,
                                        MachineBasicBlock::iterator MI,
                                        unsigned DestReg, int FrameIdx) const{
  //std::cerr << "Trying to load " << getPrettyName(DestReg) << " to " << FrameIdx << "\n";
  //BuildMI(MBB, MI, Alpha::WTF, 0, DestReg);
  BuildMI(MBB, MI, Alpha::LDQ, 2, DestReg).addFrameIndex(FrameIdx);
  //  assert(0 && "TODO");
}

void AlphaRegisterInfo::copyRegToReg(MachineBasicBlock &MBB,
                                     MachineBasicBlock::iterator MI,
                                     unsigned DestReg, unsigned SrcReg,
                                     const TargetRegisterClass *RC) const {
  //  std::cerr << "copyRegToReg " << DestReg << " <- " << SrcReg << "\n";
  if (RC == Alpha::GPRCRegisterClass) {
    BuildMI(MBB, MI, Alpha::BIS, 2, DestReg).addReg(SrcReg).addReg(SrcReg);
  } else if (RC == Alpha::FPRCRegisterClass) {
    BuildMI(MBB, MI, Alpha::CPYS, 2, DestReg).addReg(SrcReg).addReg(SrcReg);
  } else { 
    std::cerr << "Attempt to copy register that is not GPR or FPR";
     abort();
  }
}

//===----------------------------------------------------------------------===//
// Stack Frame Processing methods
//===----------------------------------------------------------------------===//

// 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.
//
static bool hasFP(MachineFunction &MF) {
  MachineFrameInfo *MFI = MF.getFrameInfo();
  return MFI->hasVarSizedObjects();
}

void AlphaRegisterInfo::
eliminateCallFramePseudoInstr(MachineFunction &MF, MachineBasicBlock &MBB,
                              MachineBasicBlock::iterator I) const {
  if (hasFP(MF)) {
    assert(0 && "TODO");
    // If we have a frame pointer, turn the adjcallstackup instruction into a
    // 'sub ESP, <amt>' and the adjcallstackdown instruction into 'add ESP,
    // <amt>'
    MachineInstr *Old = I;
    unsigned Amount = Old->getOperand(0).getImmedValue();
    if (Amount != 0) {
      // We need to keep the stack aligned properly.  To do this, we round the
      // amount of space needed for the outgoing arguments up to the next
      // alignment boundary.
      unsigned Align = MF.getTarget().getFrameInfo()->getStackAlignment();
      Amount = (Amount+Align-1)/Align*Align;

      MachineInstr *New;
//       if (Old->getOpcode() == X86::ADJCALLSTACKDOWN) {
// 	New=BuildMI(X86::SUB32ri, 1, X86::ESP, MachineOperand::UseAndDef)
//               .addZImm(Amount);
//       } else {
// 	assert(Old->getOpcode() == X86::ADJCALLSTACKUP);
// 	New=BuildMI(X86::ADD32ri, 1, X86::ESP, MachineOperand::UseAndDef)
//               .addZImm(Amount);
//       }

      // Replace the pseudo instruction with a new instruction...
      MBB.insert(I, New);
    }
  }

  MBB.erase(I);
}

void
AlphaRegisterInfo::eliminateFrameIndex(MachineBasicBlock::iterator II) const {
  assert(0 && "TODO");
//   unsigned i = 0;
//   MachineInstr &MI = *II;
//   MachineBasicBlock &MBB = *MI.getParent();
//   MachineFunction &MF = *MBB.getParent();
  
//   while (!MI.getOperand(i).isFrameIndex()) {
//     ++i;
//     assert(i < MI.getNumOperands() && "Instr doesn't have FrameIndex operand!");
//   }

//   int FrameIndex = MI.getOperand(i).getFrameIndex();

//   // Replace the FrameIndex with base register with GPR1 (SP) or GPR31 (FP).
//   MI.SetMachineOperandReg(i, hasFP(MF) ? PPC::R31 : PPC::R1);

//   // Take into account whether it's an add or mem instruction
//   unsigned OffIdx = (i == 2) ? 1 : 2;

//   // Now add the frame object offset to the offset from r1.
//   int Offset = MF.getFrameInfo()->getObjectOffset(FrameIndex) +
//                MI.getOperand(OffIdx).getImmedValue();

//   // If we're not using a Frame Pointer that has been set to the value of the
//   // SP before having the stack size subtracted from it, then add the stack size
//   // to Offset to get the correct offset.
//   Offset += MF.getFrameInfo()->getStackSize();
  
//   if (Offset > 32767 || Offset < -32768) {
//     // Insert a set of r0 with the full offset value before the ld, st, or add
//     MachineBasicBlock *MBB = MI.getParent();
//     MBB->insert(II, BuildMI(PPC::LIS, 1, PPC::R0).addSImm(Offset >> 16));
//     MBB->insert(II, BuildMI(PPC::ORI, 2, PPC::R0).addReg(PPC::R0)
//       .addImm(Offset));
//     // convert into indexed form of the instruction
//     // sth 0:rA, 1:imm 2:(rB) ==> sthx 0:rA, 2:rB, 1:r0
//     // addi 0:rA 1:rB, 2, imm ==> add 0:rA, 1:rB, 2:r0
//     unsigned NewOpcode = 
//       const_cast<std::map<unsigned, unsigned>& >(ImmToIdxMap)[MI.getOpcode()];
//     assert(NewOpcode && "No indexed form of load or store available!");
//     MI.setOpcode(NewOpcode);
//     MI.SetMachineOperandReg(1, MI.getOperand(i).getReg());
//     MI.SetMachineOperandReg(2, PPC::R0);
//   } else {
//     MI.SetMachineOperandConst(OffIdx, MachineOperand::MO_SignExtendedImmed,
//                               Offset);
//   }
}


void AlphaRegisterInfo::emitPrologue(MachineFunction &MF) const {
  MachineBasicBlock &MBB = MF.front();   // Prolog goes in entry BB
  MachineBasicBlock::iterator MBBI = MBB.begin();
  MachineFrameInfo *MFI = MF.getFrameInfo();
  MachineInstr *MI;
  
  //handle GOP offset
  MI = BuildMI(Alpha::LDGP, 0);
  MBB.insert(MBBI, MI);

  // Get the number of bytes to allocate from the FrameInfo
  unsigned NumBytes = MFI->getStackSize();

  // Do we need to allocate space on the stack?
  if (NumBytes == 0) return;

  // Add the size of R30 to  NumBytes size for the store of R30 to the 
  // stack
//   std::cerr << "Spillsize of R30 is " << getSpillSize(Alpha::R30) << "\n";
//   NumBytes = NumBytes + getSpillSize(Alpha::R30)/8;

  // Update frame info to pretend that this is part of the stack...
  MFI->setStackSize(NumBytes);
  
  // adjust stack pointer: r30 -= numbytes
  
  if (NumBytes <= 32767) {
    MI=BuildMI(Alpha::LDA, 2, Alpha::R30).addImm(-NumBytes).addReg(Alpha::R30);
    MBB.insert(MBBI, MI);
  } else if ((unsigned long)NumBytes <= (unsigned long)32767 * (unsigned long)65536) {
    long y = NumBytes / 65536;
    if (NumBytes % 65536 > 32767)
      ++y;
    MI=BuildMI(Alpha::LDAH, 2, Alpha::R30).addImm(-y).addReg(Alpha::R30);
    MBB.insert(MBBI, MI);
    MI=BuildMI(Alpha::LDA, 2, Alpha::R30).addImm(-(NumBytes - y * 65536)).addReg(Alpha::R30);
    MBB.insert(MBBI, MI);
  } else {
    std::cerr << "Too big a stack frame at " << NumBytes << "\n";
    abort();
  }
}

void AlphaRegisterInfo::emitEpilogue(MachineFunction &MF,
                                     MachineBasicBlock &MBB) const {
  const MachineFrameInfo *MFI = MF.getFrameInfo();
  MachineBasicBlock::iterator MBBI = prior(MBB.end());
  MachineInstr *MI;
  assert((MBBI->getOpcode() == Alpha::RET || MBBI->getOpcode() == Alpha::RETURN) &&
	 "Can only insert epilog into returning blocks");
  
  // Get the number of bytes allocated from the FrameInfo...
  unsigned NumBytes = MFI->getStackSize();

   if (NumBytes != 0) 
     {
       if (NumBytes <= 32767) {
         MI=BuildMI(Alpha::LDA, 2, Alpha::R30).addImm(NumBytes).addReg(Alpha::R30);
         MBB.insert(MBBI, MI);
       } else if ((unsigned long)NumBytes <= (unsigned long)32767 * (unsigned long)65536) {
         long y = NumBytes / 65536;
         if (NumBytes % 65536 > 32767)
           ++y;
         MI=BuildMI(Alpha::LDAH, 2, Alpha::R30).addImm(y).addReg(Alpha::R30);
         MBB.insert(MBBI, MI);
         MI=BuildMI(Alpha::LDA, 2, Alpha::R30).addImm(NumBytes - y * 65536).addReg(Alpha::R30);
         MBB.insert(MBBI, MI);
       } else {
         std::cerr << "Too big a stack frame at " << NumBytes << "\n";
         abort();
       }
     }
}

#include "AlphaGenRegisterInfo.inc"

const TargetRegisterClass*
AlphaRegisterInfo::getRegClassForType(const Type* Ty) const {
  switch (Ty->getTypeID()) {
    default:              assert(0 && "Invalid type to getClass!");
    case Type::BoolTyID:
    case Type::SByteTyID:
    case Type::UByteTyID:
    case Type::ShortTyID:
    case Type::UShortTyID:
    case Type::IntTyID:
    case Type::UIntTyID:
    case Type::PointerTyID:
    case Type::LongTyID:
    case Type::ULongTyID:  return &GPRCInstance;
     
  case Type::FloatTyID:
  case Type::DoubleTyID: return &FPRCInstance;
  }
}

std::string AlphaRegisterInfo::getPrettyName(unsigned reg)
{
  std::string s(RegisterDescriptors[reg].Name);
  return s;
}

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