return AMDGPU::COPY;
}
+static unsigned getSGPRSpillSaveOpcode(unsigned Size) {
+ switch (Size) {
+ case 4:
+ return AMDGPU::SI_SPILL_S32_SAVE;
+ case 8:
+ return AMDGPU::SI_SPILL_S64_SAVE;
+ case 16:
+ return AMDGPU::SI_SPILL_S128_SAVE;
+ case 32:
+ return AMDGPU::SI_SPILL_S256_SAVE;
+ case 64:
+ return AMDGPU::SI_SPILL_S512_SAVE;
+ default:
+ llvm_unreachable("unknown register size");
+ }
+}
+
+static unsigned getVGPRSpillSaveOpcode(unsigned Size) {
+ switch (Size) {
+ case 4:
+ return AMDGPU::SI_SPILL_V32_SAVE;
+ case 8:
+ return AMDGPU::SI_SPILL_V64_SAVE;
+ case 16:
+ return AMDGPU::SI_SPILL_V128_SAVE;
+ case 32:
+ return AMDGPU::SI_SPILL_V256_SAVE;
+ case 64:
+ return AMDGPU::SI_SPILL_V512_SAVE;
+ default:
+ llvm_unreachable("unknown register size");
+ }
+}
+
void SIInstrInfo::storeRegToStackSlot(MachineBasicBlock &MBB,
MachineBasicBlock::iterator MI,
unsigned SrcReg, bool isKill,
SIMachineFunctionInfo *MFI = MF->getInfo<SIMachineFunctionInfo>();
MachineFrameInfo *FrameInfo = MF->getFrameInfo();
DebugLoc DL = MBB.findDebugLoc(MI);
- int Opcode = -1;
+
+ unsigned Size = FrameInfo->getObjectSize(FrameIndex);
+ unsigned Align = FrameInfo->getObjectAlignment(FrameIndex);
+ MachinePointerInfo PtrInfo
+ = MachinePointerInfo::getFixedStack(*MF, FrameIndex);
+ MachineMemOperand *MMO
+ = MF->getMachineMemOperand(PtrInfo, MachineMemOperand::MOStore,
+ Size, Align);
if (RI.isSGPRClass(RC)) {
+ MFI->setHasSpilledSGPRs();
+
// We are only allowed to create one new instruction when spilling
// registers, so we need to use pseudo instruction for spilling
// SGPRs.
- switch (RC->getSize() * 8) {
- case 32: Opcode = AMDGPU::SI_SPILL_S32_SAVE; break;
- case 64: Opcode = AMDGPU::SI_SPILL_S64_SAVE; break;
- case 128: Opcode = AMDGPU::SI_SPILL_S128_SAVE; break;
- case 256: Opcode = AMDGPU::SI_SPILL_S256_SAVE; break;
- case 512: Opcode = AMDGPU::SI_SPILL_S512_SAVE; break;
- }
- } else if(RI.hasVGPRs(RC) && ST.isVGPRSpillingEnabled(MFI)) {
- MFI->setHasSpilledVGPRs();
-
- switch(RC->getSize() * 8) {
- case 32: Opcode = AMDGPU::SI_SPILL_V32_SAVE; break;
- case 64: Opcode = AMDGPU::SI_SPILL_V64_SAVE; break;
- case 96: Opcode = AMDGPU::SI_SPILL_V96_SAVE; break;
- case 128: Opcode = AMDGPU::SI_SPILL_V128_SAVE; break;
- case 256: Opcode = AMDGPU::SI_SPILL_V256_SAVE; break;
- case 512: Opcode = AMDGPU::SI_SPILL_V512_SAVE; break;
- }
- }
-
- if (Opcode != -1) {
- MachinePointerInfo PtrInfo
- = MachinePointerInfo::getFixedStack(*MF, FrameIndex);
- unsigned Size = FrameInfo->getObjectSize(FrameIndex);
- unsigned Align = FrameInfo->getObjectAlignment(FrameIndex);
- MachineMemOperand *MMO
- = MF->getMachineMemOperand(PtrInfo, MachineMemOperand::MOStore,
- Size, Align);
-
- FrameInfo->setObjectAlignment(FrameIndex, 4);
+ unsigned Opcode = getSGPRSpillSaveOpcode(RC->getSize());
BuildMI(MBB, MI, DL, get(Opcode))
- .addReg(SrcReg)
- .addFrameIndex(FrameIndex)
- // Place-holder registers, these will be filled in by
- // SIPrepareScratchRegs.
- .addReg(AMDGPU::SGPR0_SGPR1_SGPR2_SGPR3, RegState::Undef)
- .addReg(AMDGPU::SGPR0, RegState::Undef)
+ .addReg(SrcReg) // src
+ .addFrameIndex(FrameIndex) // frame_idx
.addMemOperand(MMO);
- } else {
+
+ return;
+ }
+
+ if (!ST.isVGPRSpillingEnabled(MFI)) {
LLVMContext &Ctx = MF->getFunction()->getContext();
Ctx.emitError("SIInstrInfo::storeRegToStackSlot - Do not know how to"
" spill register");
BuildMI(MBB, MI, DL, get(AMDGPU::KILL))
- .addReg(SrcReg);
+ .addReg(SrcReg);
+
+ return;
+ }
+
+ assert(RI.hasVGPRs(RC) && "Only VGPR spilling expected");
+
+ unsigned ScratchOffsetPreloadReg
+ = RI.getPreloadedValue(*MF, SIRegisterInfo::SCRATCH_WAVE_OFFSET);
+
+ unsigned Opcode = getVGPRSpillSaveOpcode(RC->getSize());
+ MFI->setHasSpilledVGPRs();
+ BuildMI(MBB, MI, DL, get(Opcode))
+ .addReg(SrcReg) // src
+ .addFrameIndex(FrameIndex) // frame_idx
+ .addReg(MFI->getScratchRSrcReg()) // scratch_rsrc
+ .addReg(ScratchOffsetPreloadReg) // scratch_offset
+ .addMemOperand(MMO);
+}
+
+static unsigned getSGPRSpillRestoreOpcode(unsigned Size) {
+ switch (Size) {
+ case 4:
+ return AMDGPU::SI_SPILL_S32_RESTORE;
+ case 8:
+ return AMDGPU::SI_SPILL_S64_RESTORE;
+ case 16:
+ return AMDGPU::SI_SPILL_S128_RESTORE;
+ case 32:
+ return AMDGPU::SI_SPILL_S256_RESTORE;
+ case 64:
+ return AMDGPU::SI_SPILL_S512_RESTORE;
+ default:
+ llvm_unreachable("unknown register size");
+ }
+}
+
+static unsigned getVGPRSpillRestoreOpcode(unsigned Size) {
+ switch (Size) {
+ case 4:
+ return AMDGPU::SI_SPILL_V32_RESTORE;
+ case 8:
+ return AMDGPU::SI_SPILL_V64_RESTORE;
+ case 16:
+ return AMDGPU::SI_SPILL_V128_RESTORE;
+ case 32:
+ return AMDGPU::SI_SPILL_V256_RESTORE;
+ case 64:
+ return AMDGPU::SI_SPILL_V512_RESTORE;
+ default:
+ llvm_unreachable("unknown register size");
}
}
const SIMachineFunctionInfo *MFI = MF->getInfo<SIMachineFunctionInfo>();
MachineFrameInfo *FrameInfo = MF->getFrameInfo();
DebugLoc DL = MBB.findDebugLoc(MI);
- int Opcode = -1;
-
- if (RI.isSGPRClass(RC)){
- switch(RC->getSize() * 8) {
- case 32: Opcode = AMDGPU::SI_SPILL_S32_RESTORE; break;
- case 64: Opcode = AMDGPU::SI_SPILL_S64_RESTORE; break;
- case 128: Opcode = AMDGPU::SI_SPILL_S128_RESTORE; break;
- case 256: Opcode = AMDGPU::SI_SPILL_S256_RESTORE; break;
- case 512: Opcode = AMDGPU::SI_SPILL_S512_RESTORE; break;
- }
- } else if(RI.hasVGPRs(RC) && ST.isVGPRSpillingEnabled(MFI)) {
- switch(RC->getSize() * 8) {
- case 32: Opcode = AMDGPU::SI_SPILL_V32_RESTORE; break;
- case 64: Opcode = AMDGPU::SI_SPILL_V64_RESTORE; break;
- case 96: Opcode = AMDGPU::SI_SPILL_V96_RESTORE; break;
- case 128: Opcode = AMDGPU::SI_SPILL_V128_RESTORE; break;
- case 256: Opcode = AMDGPU::SI_SPILL_V256_RESTORE; break;
- case 512: Opcode = AMDGPU::SI_SPILL_V512_RESTORE; break;
- }
- }
+ unsigned Align = FrameInfo->getObjectAlignment(FrameIndex);
+ unsigned Size = FrameInfo->getObjectSize(FrameIndex);
- if (Opcode != -1) {
- unsigned Align = 4;
- FrameInfo->setObjectAlignment(FrameIndex, Align);
- unsigned Size = FrameInfo->getObjectSize(FrameIndex);
+ MachinePointerInfo PtrInfo
+ = MachinePointerInfo::getFixedStack(*MF, FrameIndex);
- MachinePointerInfo PtrInfo
- = MachinePointerInfo::getFixedStack(*MF, FrameIndex);
- MachineMemOperand *MMO = MF->getMachineMemOperand(
- PtrInfo, MachineMemOperand::MOLoad, Size, Align);
+ MachineMemOperand *MMO = MF->getMachineMemOperand(
+ PtrInfo, MachineMemOperand::MOLoad, Size, Align);
+ if (RI.isSGPRClass(RC)) {
+ // FIXME: Maybe this should not include a memoperand because it will be
+ // lowered to non-memory instructions.
+ unsigned Opcode = getSGPRSpillRestoreOpcode(RC->getSize());
BuildMI(MBB, MI, DL, get(Opcode), DestReg)
- .addFrameIndex(FrameIndex)
- // Place-holder registers, these will be filled in by
- // SIPrepareScratchRegs.
- .addReg(AMDGPU::SGPR0_SGPR1_SGPR2_SGPR3, RegState::Undef)
- .addReg(AMDGPU::SGPR0, RegState::Undef)
+ .addFrameIndex(FrameIndex) // frame_idx
.addMemOperand(MMO);
- } else {
+
+ return;
+ }
+
+ if (!ST.isVGPRSpillingEnabled(MFI)) {
LLVMContext &Ctx = MF->getFunction()->getContext();
Ctx.emitError("SIInstrInfo::loadRegFromStackSlot - Do not know how to"
" restore register");
BuildMI(MBB, MI, DL, get(AMDGPU::IMPLICIT_DEF), DestReg);
+
+ return;
}
+
+ assert(RI.hasVGPRs(RC) && "Only VGPR spilling expected");
+
+ unsigned ScratchOffsetPreloadReg
+ = RI.getPreloadedValue(*MF, SIRegisterInfo::SCRATCH_WAVE_OFFSET);
+
+ unsigned Opcode = getVGPRSpillRestoreOpcode(RC->getSize());
+ BuildMI(MBB, MI, DL, get(Opcode), DestReg)
+ .addFrameIndex(FrameIndex) // frame_idx
+ .addReg(MFI->getScratchRSrcReg()) // scratch_rsrc
+ .addReg(ScratchOffsetPreloadReg) // scratch_offset
+ .addMemOperand(MMO);
}
/// \param @Offset Offset in bytes of the FrameIndex being spilled
}
RS->enterBasicBlock(&Entry);
+ // FIXME: Can we scavenge an SReg_64 and access the subregs?
unsigned STmp0 = RS->scavengeRegister(&AMDGPU::SGPR_32RegClass, 0);
unsigned STmp1 = RS->scavengeRegister(&AMDGPU::SGPR_32RegClass, 0);
BuildMI(Entry, Insert, DL, get(AMDGPU::S_LOAD_DWORD_IMM), STmp0)
return false;
}
+static unsigned findImplicitSGPRRead(const MachineInstr &MI) {
+ for (const MachineOperand &MO : MI.implicit_operands()) {
+ // We only care about reads.
+ if (MO.isDef())
+ continue;
+
+ switch (MO.getReg()) {
+ case AMDGPU::VCC:
+ case AMDGPU::M0:
+ case AMDGPU::FLAT_SCR:
+ return MO.getReg();
+
+ default:
+ break;
+ }
+ }
+
+ return AMDGPU::NoRegister;
+}
+
bool SIInstrInfo::verifyInstruction(const MachineInstr *MI,
StringRef &ErrInfo) const {
uint16_t Opcode = MI->getOpcode();
const int OpIndices[] = { Src0Idx, Src1Idx, Src2Idx };
unsigned ConstantBusCount = 0;
- unsigned SGPRUsed = AMDGPU::NoRegister;
+ unsigned SGPRUsed = findImplicitSGPRRead(*MI);
+ if (SGPRUsed != AMDGPU::NoRegister)
+ ++ConstantBusCount;
+
for (int OpIdx : OpIndices) {
if (OpIdx == -1)
break;
return isImmOperandLegal(MI, OpIdx, *MO);
}
+// Legalize VOP3 operands. Because all operand types are supported for any
+// operand, and since literal constants are not allowed and should never be
+// seen, we only need to worry about inserting copies if we use multiple SGPR
+// operands.
+void SIInstrInfo::legalizeOperandsVOP3(
+ MachineRegisterInfo &MRI,
+ MachineInstr *MI) const {
+ unsigned Opc = MI->getOpcode();
+
+ int VOP3Idx[3] = {
+ AMDGPU::getNamedOperandIdx(Opc, AMDGPU::OpName::src0),
+ AMDGPU::getNamedOperandIdx(Opc, AMDGPU::OpName::src1),
+ AMDGPU::getNamedOperandIdx(Opc, AMDGPU::OpName::src2)
+ };
+
+ // Find the one SGPR operand we are allowed to use.
+ unsigned SGPRReg = findUsedSGPR(MI, VOP3Idx);
+
+ for (unsigned i = 0; i < 3; ++i) {
+ int Idx = VOP3Idx[i];
+ if (Idx == -1)
+ break;
+ MachineOperand &MO = MI->getOperand(Idx);
+
+ // We should never see a VOP3 instruction with an illegal immediate operand.
+ if (!MO.isReg())
+ continue;
+
+ if (!RI.isSGPRClass(MRI.getRegClass(MO.getReg())))
+ continue; // VGPRs are legal
+
+ if (SGPRReg == AMDGPU::NoRegister || SGPRReg == MO.getReg()) {
+ SGPRReg = MO.getReg();
+ // We can use one SGPR in each VOP3 instruction.
+ continue;
+ }
+
+ // If we make it this far, then the operand is not legal and we must
+ // legalize it.
+ legalizeOpWithMove(MI, Idx);
+ }
+}
+
void SIInstrInfo::legalizeOperands(MachineInstr *MI) const {
MachineRegisterInfo &MRI = MI->getParent()->getParent()->getRegInfo();
-
- int Src0Idx = AMDGPU::getNamedOperandIdx(MI->getOpcode(),
- AMDGPU::OpName::src0);
- int Src1Idx = AMDGPU::getNamedOperandIdx(MI->getOpcode(),
- AMDGPU::OpName::src1);
- int Src2Idx = AMDGPU::getNamedOperandIdx(MI->getOpcode(),
- AMDGPU::OpName::src2);
+ unsigned Opc = MI->getOpcode();
// Legalize VOP2
- if (isVOP2(*MI) && Src1Idx != -1) {
+ if (isVOP2(*MI)) {
+ int Src0Idx = AMDGPU::getNamedOperandIdx(Opc, AMDGPU::OpName::src0);
+ int Src1Idx = AMDGPU::getNamedOperandIdx(Opc, AMDGPU::OpName::src1);
+
// Legalize src0
if (!isOperandLegal(MI, Src0Idx))
legalizeOpWithMove(MI, Src0Idx);
return;
}
- // XXX - Do any VOP3 instructions read VCC?
// Legalize VOP3
if (isVOP3(*MI)) {
- int VOP3Idx[3] = { Src0Idx, Src1Idx, Src2Idx };
-
- // Find the one SGPR operand we are allowed to use.
- unsigned SGPRReg = findUsedSGPR(MI, VOP3Idx);
-
- for (unsigned i = 0; i < 3; ++i) {
- int Idx = VOP3Idx[i];
- if (Idx == -1)
- break;
- MachineOperand &MO = MI->getOperand(Idx);
-
- if (MO.isReg()) {
- if (!RI.isSGPRClass(MRI.getRegClass(MO.getReg())))
- continue; // VGPRs are legal
-
- assert(MO.getReg() != AMDGPU::SCC && "SCC operand to VOP3 instruction");
-
- if (SGPRReg == AMDGPU::NoRegister || SGPRReg == MO.getReg()) {
- SGPRReg = MO.getReg();
- // We can use one SGPR in each VOP3 instruction.
- continue;
- }
- } else if (!isLiteralConstant(MO, getOpSize(MI->getOpcode(), Idx))) {
- // If it is not a register and not a literal constant, then it must be
- // an inline constant which is always legal.
- continue;
- }
- // If we make it this far, then the operand is not legal and we must
- // legalize it.
- legalizeOpWithMove(MI, Idx);
- }
-
+ legalizeOperandsVOP3(MRI, MI);
return;
}
} else {
// This instructions is the _OFFSET variant, so we need to convert it to
// ADDR64.
+ assert(MBB.getParent()->getSubtarget<AMDGPUSubtarget>().getGeneration()
+ < AMDGPUSubtarget::VOLCANIC_ISLANDS &&
+ "FIXME: Need to emit flat atomics here");
+
MachineOperand *VData = getNamedOperand(*MI, AMDGPU::OpName::vdata);
MachineOperand *Offset = getNamedOperand(*MI, AMDGPU::OpName::offset);
MachineOperand *SOffset = getNamedOperand(*MI, AMDGPU::OpName::soffset);
-
- // Create the new instruction.
unsigned Addr64Opcode = AMDGPU::getAddr64Inst(MI->getOpcode());
- MachineInstr *Addr64 =
- BuildMI(MBB, MI, MI->getDebugLoc(), get(Addr64Opcode))
- .addOperand(*VData)
- .addReg(AMDGPU::NoRegister) // Dummy value for vaddr.
- // This will be replaced later
- // with the new value of vaddr.
- .addOperand(*SRsrc)
- .addOperand(*SOffset)
- .addOperand(*Offset)
- .addImm(0) // glc
- .addImm(0) // slc
- .addImm(0) // tfe
- .setMemRefs(MI->memoperands_begin(), MI->memoperands_end());
+
+ // Atomics rith return have have an additional tied operand and are
+ // missing some of the special bits.
+ MachineOperand *VDataIn = getNamedOperand(*MI, AMDGPU::OpName::vdata_in);
+ MachineInstr *Addr64;
+
+ if (!VDataIn) {
+ // Regular buffer load / store.
+ MachineInstrBuilder MIB
+ = BuildMI(MBB, MI, MI->getDebugLoc(), get(Addr64Opcode))
+ .addOperand(*VData)
+ .addReg(AMDGPU::NoRegister) // Dummy value for vaddr.
+ // This will be replaced later
+ // with the new value of vaddr.
+ .addOperand(*SRsrc)
+ .addOperand(*SOffset)
+ .addOperand(*Offset);
+
+ // Atomics do not have this operand.
+ if (const MachineOperand *GLC
+ = getNamedOperand(*MI, AMDGPU::OpName::glc)) {
+ MIB.addImm(GLC->getImm());
+ }
+
+ MIB.addImm(getNamedImmOperand(*MI, AMDGPU::OpName::slc));
+
+ if (const MachineOperand *TFE
+ = getNamedOperand(*MI, AMDGPU::OpName::tfe)) {
+ MIB.addImm(TFE->getImm());
+ }
+
+ MIB.setMemRefs(MI->memoperands_begin(), MI->memoperands_end());
+ Addr64 = MIB;
+ } else {
+ // Atomics with return.
+ Addr64 = BuildMI(MBB, MI, MI->getDebugLoc(), get(Addr64Opcode))
+ .addOperand(*VData)
+ .addOperand(*VDataIn)
+ .addReg(AMDGPU::NoRegister) // Dummy value for vaddr.
+ // This will be replaced later
+ // with the new value of vaddr.
+ .addOperand(*SRsrc)
+ .addOperand(*SOffset)
+ .addOperand(*Offset)
+ .addImm(getNamedImmOperand(*MI, AMDGPU::OpName::slc))
+ .setMemRefs(MI->memoperands_begin(), MI->memoperands_end());
+ }
MI->removeFromParent();
MI = Addr64;
}
break;
+ case AMDGPU::S_ABS_I32:
+ lowerScalarAbs(Worklist, Inst);
+ Inst->eraseFromParent();
+ continue;
+
case AMDGPU::S_BFE_U64:
case AMDGPU::S_BFM_B64:
llvm_unreachable("Moving this op to VALU not implemented");
return &AMDGPU::VGPR_32RegClass;
}
+void SIInstrInfo::lowerScalarAbs(SmallVectorImpl<MachineInstr *> &Worklist,
+ MachineInstr *Inst) const {
+ MachineBasicBlock &MBB = *Inst->getParent();
+ MachineRegisterInfo &MRI = MBB.getParent()->getRegInfo();
+ MachineBasicBlock::iterator MII = Inst;
+ DebugLoc DL = Inst->getDebugLoc();
+
+ MachineOperand &Dest = Inst->getOperand(0);
+ MachineOperand &Src = Inst->getOperand(1);
+ unsigned TmpReg = MRI.createVirtualRegister(&AMDGPU::VGPR_32RegClass);
+ unsigned ResultReg = MRI.createVirtualRegister(&AMDGPU::VGPR_32RegClass);
+
+ BuildMI(MBB, MII, DL, get(AMDGPU::V_SUB_I32_e32), TmpReg)
+ .addImm(0)
+ .addReg(Src.getReg());
+
+ BuildMI(MBB, MII, DL, get(AMDGPU::V_MAX_I32_e64), ResultReg)
+ .addReg(Src.getReg())
+ .addReg(TmpReg);
+
+ MRI.replaceRegWith(Dest.getReg(), ResultReg);
+ addUsersToMoveToVALUWorklist(ResultReg, MRI, Worklist);
+}
+
void SIInstrInfo::splitScalar64BitUnaryOp(
SmallVectorImpl<MachineInstr *> &Worklist,
MachineInstr *Inst,
}
}
+// Find the one SGPR operand we are allowed to use.
unsigned SIInstrInfo::findUsedSGPR(const MachineInstr *MI,
int OpIndices[3]) const {
- const MCInstrDesc &Desc = get(MI->getOpcode());
+ const MCInstrDesc &Desc = MI->getDesc();
// Find the one SGPR operand we are allowed to use.
- unsigned SGPRReg = AMDGPU::NoRegister;
-
+ //
// First we need to consider the instruction's operand requirements before
// legalizing. Some operands are required to be SGPRs, such as implicit uses
// of VCC, but we are still bound by the constant bus requirement to only use
//
// If the operand's class is an SGPR, we can never move it.
- for (const MachineOperand &MO : MI->implicit_operands()) {
- // We only care about reads.
- if (MO.isDef())
- continue;
-
- if (MO.getReg() == AMDGPU::VCC)
- return AMDGPU::VCC;
-
- if (MO.getReg() == AMDGPU::FLAT_SCR)
- return AMDGPU::FLAT_SCR;
- }
+ unsigned SGPRReg = findImplicitSGPRRead(*MI);
+ if (SGPRReg != AMDGPU::NoRegister)
+ return SGPRReg;
unsigned UsedSGPRs[3] = { AMDGPU::NoRegister };
const MachineRegisterInfo &MRI = MI->getParent()->getParent()->getRegInfo();
break;
const MachineOperand &MO = MI->getOperand(Idx);
- if (RI.isSGPRClassID(Desc.OpInfo[Idx].RegClass))
- SGPRReg = MO.getReg();
+ if (!MO.isReg())
+ continue;
- if (MO.isReg() && RI.isSGPRClass(MRI.getRegClass(MO.getReg())))
- UsedSGPRs[i] = MO.getReg();
- }
+ // Is this operand statically required to be an SGPR based on the operand
+ // constraints?
+ const TargetRegisterClass *OpRC = RI.getRegClass(Desc.OpInfo[Idx].RegClass);
+ bool IsRequiredSGPR = RI.isSGPRClass(OpRC);
+ if (IsRequiredSGPR)
+ return MO.getReg();
- if (SGPRReg != AMDGPU::NoRegister)
- return SGPRReg;
+ // If this could be a VGPR or an SGPR, Check the dynamic register class.
+ unsigned Reg = MO.getReg();
+ const TargetRegisterClass *RegRC = MRI.getRegClass(Reg);
+ if (RI.isSGPRClass(RegRC))
+ UsedSGPRs[i] = Reg;
+ }
// We don't have a required SGPR operand, so we have a bit more freedom in
// selecting operands to move.
// V_FMA_F32 v0, s0, s0, s0 -> No moves
// V_FMA_F32 v0, s0, s1, s0 -> Move s1
+ // TODO: If some of the operands are 64-bit SGPRs and some 32, we should
+ // prefer those.
+
if (UsedSGPRs[0] != AMDGPU::NoRegister) {
if (UsedSGPRs[0] == UsedSGPRs[1] || UsedSGPRs[0] == UsedSGPRs[2])
SGPRReg = UsedSGPRs[0];
projects / oota-llvm.git / blobdiff