Exemplo n.º 1
0
// FIXME: Does this need to check IEEE bit on function?
bool SIFoldOperands::tryFoldOMod(MachineInstr &MI) {
  const MachineOperand *RegOp;
  int OMod;
  std::tie(RegOp, OMod) = isOMod(MI);
  if (OMod == SIOutMods::NONE || !RegOp->isReg() ||
      RegOp->getSubReg() != AMDGPU::NoSubRegister ||
      !hasOneNonDBGUseInst(*MRI, RegOp->getReg()))
    return false;

  MachineInstr *Def = MRI->getVRegDef(RegOp->getReg());
  MachineOperand *DefOMod = TII->getNamedOperand(*Def, AMDGPU::OpName::omod);
  if (!DefOMod || DefOMod->getImm() != SIOutMods::NONE)
    return false;

  // Clamp is applied after omod. If the source already has clamp set, don't
  // fold it.
  if (TII->hasModifiersSet(*Def, AMDGPU::OpName::clamp))
    return false;

  DEBUG(dbgs() << "Folding omod " << MI << " into " << *Def << '\n');

  DefOMod->setImm(OMod);
  MRI->replaceRegWith(MI.getOperand(0).getReg(), Def->getOperand(0).getReg());
  MI.eraseFromParent();
  return true;
}
Exemplo n.º 2
0
void SIRegisterInfo::resolveFrameIndex(MachineInstr &MI, unsigned BaseReg,
                                       int64_t Offset) const {

  MachineBasicBlock *MBB = MI.getParent();
  MachineFunction *MF = MBB->getParent();
  const SISubtarget &Subtarget = MF->getSubtarget<SISubtarget>();
  const SIInstrInfo *TII = Subtarget.getInstrInfo();

#ifndef NDEBUG
  // FIXME: Is it possible to be storing a frame index to itself?
  bool SeenFI = false;
  for (const MachineOperand &MO: MI.operands()) {
    if (MO.isFI()) {
      if (SeenFI)
        llvm_unreachable("should not see multiple frame indices");

      SeenFI = true;
    }
  }
#endif

  MachineOperand *FIOp = TII->getNamedOperand(MI, AMDGPU::OpName::vaddr);
  assert(FIOp && FIOp->isFI() && "frame index must be address operand");

  assert(TII->isMUBUF(MI));

  MachineOperand *OffsetOp = TII->getNamedOperand(MI, AMDGPU::OpName::offset);
  int64_t NewOffset = OffsetOp->getImm() + Offset;
  assert(isUInt<12>(NewOffset) && "offset should be legal");

  FIOp->ChangeToRegister(BaseReg, false);
  OffsetOp->setImm(NewOffset);
}
Exemplo n.º 3
0
void HexagonPeephole::ChangeOpInto(MachineOperand &Dst, MachineOperand &Src) {
  assert (&Dst != &Src && "Cannot duplicate into itself");
  switch (Dst.getType()) {
    case MachineOperand::MO_Register:
      if (Src.isReg()) {
        Dst.setReg(Src.getReg());
      } else if (Src.isImm()) {
        Dst.ChangeToImmediate(Src.getImm());
      } else {
        llvm_unreachable("Unexpected src operand type");
      }
      break;

    case MachineOperand::MO_Immediate:
      if (Src.isImm()) {
        Dst.setImm(Src.getImm());
      } else if (Src.isReg()) {
        Dst.ChangeToRegister(Src.getReg(), Src.isDef(), Src.isImplicit(),
                             Src.isKill(), Src.isDead(), Src.isUndef(),
                             Src.isDebug());
      } else {
        llvm_unreachable("Unexpected src operand type");
      }
      break;

    default:
      llvm_unreachable("Unexpected dst operand type");
      break;
  }
}
Exemplo n.º 4
0
void SIRegisterInfo::resolveFrameIndex(MachineInstr &MI, unsigned BaseReg,
                                       int64_t Offset) const {

  MachineBasicBlock *MBB = MI.getParent();
  MachineFunction *MF = MBB->getParent();
  const SISubtarget &Subtarget = MF->getSubtarget<SISubtarget>();
  const SIInstrInfo *TII = Subtarget.getInstrInfo();

#ifndef NDEBUG
  // FIXME: Is it possible to be storing a frame index to itself?
  bool SeenFI = false;
  for (const MachineOperand &MO: MI.operands()) {
    if (MO.isFI()) {
      if (SeenFI)
        llvm_unreachable("should not see multiple frame indices");

      SeenFI = true;
    }
  }
#endif

  MachineOperand *FIOp = TII->getNamedOperand(MI, AMDGPU::OpName::vaddr);
  assert(FIOp && FIOp->isFI() && "frame index must be address operand");

  assert(TII->isMUBUF(MI));

  MachineOperand *OffsetOp = TII->getNamedOperand(MI, AMDGPU::OpName::offset);
  int64_t NewOffset = OffsetOp->getImm() + Offset;
  if (isUInt<12>(NewOffset)) {
    // If we have a legal offset, fold it directly into the instruction.
    FIOp->ChangeToRegister(BaseReg, false);
    OffsetOp->setImm(NewOffset);
    return;
  }

  // The offset is not legal, so we must insert an add of the offset.
  MachineRegisterInfo &MRI = MF->getRegInfo();
  unsigned NewReg = MRI.createVirtualRegister(&AMDGPU::VGPR_32RegClass);
  DebugLoc DL = MI.getDebugLoc();

  assert(Offset != 0 && "Non-zero offset expected");

  unsigned UnusedCarry = MRI.createVirtualRegister(&AMDGPU::SReg_64RegClass);
  unsigned OffsetReg = MRI.createVirtualRegister(&AMDGPU::SReg_32RegClass);

  // In the case the instruction already had an immediate offset, here only
  // the requested new offset is added because we are leaving the original
  // immediate in place.
  BuildMI(*MBB, MI, DL, TII->get(AMDGPU::S_MOV_B32), OffsetReg)
    .addImm(Offset);
  BuildMI(*MBB, MI, DL, TII->get(AMDGPU::V_ADD_I32_e64), NewReg)
    .addReg(UnusedCarry, RegState::Define | RegState::Dead)
    .addReg(OffsetReg, RegState::Kill)
    .addReg(BaseReg);

  FIOp->ChangeToRegister(NewReg, false);
}
Exemplo n.º 5
0
/// Add 4 to the displacement of operand MO.
static void fixDisp(MachineOperand &MO) {
  switch (MO.getType()) {
  default:
    llvm_unreachable("Unhandled operand type.");
  case MachineOperand::MO_Immediate:
    MO.setImm(MO.getImm() + 4);
    break;
  case MachineOperand::MO_GlobalAddress:
  case MachineOperand::MO_ConstantPoolIndex:
  case MachineOperand::MO_BlockAddress:
  case MachineOperand::MO_TargetIndex:
  case MachineOperand::MO_ExternalSymbol:
    MO.setOffset(MO.getOffset() + 4);
    break;
  }
}
Exemplo n.º 6
0
bool SIFoldOperands::tryFoldClamp(MachineInstr &MI) {
  const MachineOperand *ClampSrc = isClamp(MI);
  if (!ClampSrc || !hasOneNonDBGUseInst(*MRI, ClampSrc->getReg()))
    return false;

  MachineInstr *Def = MRI->getVRegDef(ClampSrc->getReg());
  if (!TII->hasFPClamp(*Def))
    return false;
  MachineOperand *DefClamp = TII->getNamedOperand(*Def, AMDGPU::OpName::clamp);
  if (!DefClamp)
    return false;

  DEBUG(dbgs() << "Folding clamp " << *DefClamp << " into " << *Def << '\n');

  // Clamp is applied after omod, so it is OK if omod is set.
  DefClamp->setImm(1);
  MRI->replaceRegWith(MI.getOperand(0).getReg(), Def->getOperand(0).getReg());
  MI.eraseFromParent();
  return true;
}