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llvm-project/llvm/lib/Target/AMDGPU/SIInstrInfo.cpp

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//===-- SIInstrInfo.cpp - SI Instruction Information ---------------------===//
//
// The LLVM Compiler Infrastructure
//
// This file is distributed under the University of Illinois Open Source
// License. See LICENSE.TXT for details.
//
//===----------------------------------------------------------------------===//
//
/// \file
/// \brief SI Implementation of TargetInstrInfo.
//
//===----------------------------------------------------------------------===//
#include "SIInstrInfo.h"
#include "AMDGPUTargetMachine.h"
#include "GCNHazardRecognizer.h"
#include "SIDefines.h"
#include "SIMachineFunctionInfo.h"
#include "llvm/CodeGen/MachineFrameInfo.h"
#include "llvm/CodeGen/MachineInstrBuilder.h"
#include "llvm/CodeGen/MachineRegisterInfo.h"
#include "llvm/CodeGen/ScheduleDAG.h"
#include "llvm/IR/Function.h"
#include "llvm/CodeGen/RegisterScavenging.h"
#include "llvm/MC/MCInstrDesc.h"
#include "llvm/Support/Debug.h"
using namespace llvm;
// Must be at least 4 to be able to branch over minimum unconditional branch
// code. This is only for making it possible to write reasonably small tests for
// long branches.
static cl::opt<unsigned>
BranchOffsetBits("amdgpu-s-branch-bits", cl::ReallyHidden, cl::init(16),
cl::desc("Restrict range of branch instructions (DEBUG)"));
SIInstrInfo::SIInstrInfo(const SISubtarget &ST)
: AMDGPUInstrInfo(ST), RI(), ST(ST) {}
//===----------------------------------------------------------------------===//
// TargetInstrInfo callbacks
//===----------------------------------------------------------------------===//
static unsigned getNumOperandsNoGlue(SDNode *Node) {
unsigned N = Node->getNumOperands();
while (N && Node->getOperand(N - 1).getValueType() == MVT::Glue)
--N;
return N;
}
static SDValue findChainOperand(SDNode *Load) {
SDValue LastOp = Load->getOperand(getNumOperandsNoGlue(Load) - 1);
assert(LastOp.getValueType() == MVT::Other && "Chain missing from load node");
return LastOp;
}
/// \brief Returns true if both nodes have the same value for the given
/// operand \p Op, or if both nodes do not have this operand.
static bool nodesHaveSameOperandValue(SDNode *N0, SDNode* N1, unsigned OpName) {
unsigned Opc0 = N0->getMachineOpcode();
unsigned Opc1 = N1->getMachineOpcode();
int Op0Idx = AMDGPU::getNamedOperandIdx(Opc0, OpName);
int Op1Idx = AMDGPU::getNamedOperandIdx(Opc1, OpName);
if (Op0Idx == -1 && Op1Idx == -1)
return true;
if ((Op0Idx == -1 && Op1Idx != -1) ||
(Op1Idx == -1 && Op0Idx != -1))
return false;
// getNamedOperandIdx returns the index for the MachineInstr's operands,
// which includes the result as the first operand. We are indexing into the
// MachineSDNode's operands, so we need to skip the result operand to get
// the real index.
--Op0Idx;
--Op1Idx;
return N0->getOperand(Op0Idx) == N1->getOperand(Op1Idx);
}
bool SIInstrInfo::isReallyTriviallyReMaterializable(const MachineInstr &MI,
AliasAnalysis *AA) const {
// TODO: The generic check fails for VALU instructions that should be
// rematerializable due to implicit reads of exec. We really want all of the
// generic logic for this except for this.
switch (MI.getOpcode()) {
case AMDGPU::V_MOV_B32_e32:
case AMDGPU::V_MOV_B32_e64:
case AMDGPU::V_MOV_B64_PSEUDO:
return true;
default:
return false;
}
}
bool SIInstrInfo::areLoadsFromSameBasePtr(SDNode *Load0, SDNode *Load1,
int64_t &Offset0,
int64_t &Offset1) const {
if (!Load0->isMachineOpcode() || !Load1->isMachineOpcode())
return false;
unsigned Opc0 = Load0->getMachineOpcode();
unsigned Opc1 = Load1->getMachineOpcode();
// Make sure both are actually loads.
if (!get(Opc0).mayLoad() || !get(Opc1).mayLoad())
return false;
if (isDS(Opc0) && isDS(Opc1)) {
// FIXME: Handle this case:
if (getNumOperandsNoGlue(Load0) != getNumOperandsNoGlue(Load1))
return false;
// Check base reg.
if (Load0->getOperand(1) != Load1->getOperand(1))
return false;
// Check chain.
if (findChainOperand(Load0) != findChainOperand(Load1))
return false;
// Skip read2 / write2 variants for simplicity.
// TODO: We should report true if the used offsets are adjacent (excluded
// st64 versions).
if (AMDGPU::getNamedOperandIdx(Opc0, AMDGPU::OpName::data1) != -1 ||
AMDGPU::getNamedOperandIdx(Opc1, AMDGPU::OpName::data1) != -1)
return false;
Offset0 = cast<ConstantSDNode>(Load0->getOperand(2))->getZExtValue();
Offset1 = cast<ConstantSDNode>(Load1->getOperand(2))->getZExtValue();
return true;
}
if (isSMRD(Opc0) && isSMRD(Opc1)) {
assert(getNumOperandsNoGlue(Load0) == getNumOperandsNoGlue(Load1));
// Check base reg.
if (Load0->getOperand(0) != Load1->getOperand(0))
return false;
const ConstantSDNode *Load0Offset =
dyn_cast<ConstantSDNode>(Load0->getOperand(1));
const ConstantSDNode *Load1Offset =
dyn_cast<ConstantSDNode>(Load1->getOperand(1));
if (!Load0Offset || !Load1Offset)
return false;
// Check chain.
if (findChainOperand(Load0) != findChainOperand(Load1))
return false;
Offset0 = Load0Offset->getZExtValue();
Offset1 = Load1Offset->getZExtValue();
return true;
}
// MUBUF and MTBUF can access the same addresses.
if ((isMUBUF(Opc0) || isMTBUF(Opc0)) && (isMUBUF(Opc1) || isMTBUF(Opc1))) {
// MUBUF and MTBUF have vaddr at different indices.
if (!nodesHaveSameOperandValue(Load0, Load1, AMDGPU::OpName::soffset) ||
findChainOperand(Load0) != findChainOperand(Load1) ||
!nodesHaveSameOperandValue(Load0, Load1, AMDGPU::OpName::vaddr) ||
!nodesHaveSameOperandValue(Load0, Load1, AMDGPU::OpName::srsrc))
return false;
int OffIdx0 = AMDGPU::getNamedOperandIdx(Opc0, AMDGPU::OpName::offset);
int OffIdx1 = AMDGPU::getNamedOperandIdx(Opc1, AMDGPU::OpName::offset);
if (OffIdx0 == -1 || OffIdx1 == -1)
return false;
// getNamedOperandIdx returns the index for MachineInstrs. Since they
// inlcude the output in the operand list, but SDNodes don't, we need to
// subtract the index by one.
--OffIdx0;
--OffIdx1;
SDValue Off0 = Load0->getOperand(OffIdx0);
SDValue Off1 = Load1->getOperand(OffIdx1);
// The offset might be a FrameIndexSDNode.
if (!isa<ConstantSDNode>(Off0) || !isa<ConstantSDNode>(Off1))
return false;
Offset0 = cast<ConstantSDNode>(Off0)->getZExtValue();
Offset1 = cast<ConstantSDNode>(Off1)->getZExtValue();
return true;
}
return false;
}
static bool isStride64(unsigned Opc) {
switch (Opc) {
case AMDGPU::DS_READ2ST64_B32:
case AMDGPU::DS_READ2ST64_B64:
case AMDGPU::DS_WRITE2ST64_B32:
case AMDGPU::DS_WRITE2ST64_B64:
return true;
default:
return false;
}
}
bool SIInstrInfo::getMemOpBaseRegImmOfs(MachineInstr &LdSt, unsigned &BaseReg,
int64_t &Offset,
const TargetRegisterInfo *TRI) const {
unsigned Opc = LdSt.getOpcode();
if (isDS(LdSt)) {
const MachineOperand *OffsetImm =
getNamedOperand(LdSt, AMDGPU::OpName::offset);
if (OffsetImm) {
// Normal, single offset LDS instruction.
const MachineOperand *AddrReg =
getNamedOperand(LdSt, AMDGPU::OpName::addr);
BaseReg = AddrReg->getReg();
Offset = OffsetImm->getImm();
return true;
}
// The 2 offset instructions use offset0 and offset1 instead. We can treat
// these as a load with a single offset if the 2 offsets are consecutive. We
// will use this for some partially aligned loads.
const MachineOperand *Offset0Imm =
getNamedOperand(LdSt, AMDGPU::OpName::offset0);
const MachineOperand *Offset1Imm =
getNamedOperand(LdSt, AMDGPU::OpName::offset1);
uint8_t Offset0 = Offset0Imm->getImm();
uint8_t Offset1 = Offset1Imm->getImm();
if (Offset1 > Offset0 && Offset1 - Offset0 == 1) {
// Each of these offsets is in element sized units, so we need to convert
// to bytes of the individual reads.
unsigned EltSize;
if (LdSt.mayLoad())
EltSize = getOpRegClass(LdSt, 0)->getSize() / 2;
else {
assert(LdSt.mayStore());
int Data0Idx = AMDGPU::getNamedOperandIdx(Opc, AMDGPU::OpName::data0);
EltSize = getOpRegClass(LdSt, Data0Idx)->getSize();
}
if (isStride64(Opc))
EltSize *= 64;
const MachineOperand *AddrReg =
getNamedOperand(LdSt, AMDGPU::OpName::addr);
BaseReg = AddrReg->getReg();
Offset = EltSize * Offset0;
return true;
}
return false;
}
if (isMUBUF(LdSt) || isMTBUF(LdSt)) {
if (AMDGPU::getNamedOperandIdx(Opc, AMDGPU::OpName::soffset) != -1)
return false;
const MachineOperand *AddrReg =
getNamedOperand(LdSt, AMDGPU::OpName::vaddr);
if (!AddrReg)
return false;
const MachineOperand *OffsetImm =
getNamedOperand(LdSt, AMDGPU::OpName::offset);
BaseReg = AddrReg->getReg();
Offset = OffsetImm->getImm();
return true;
}
if (isSMRD(LdSt)) {
const MachineOperand *OffsetImm =
getNamedOperand(LdSt, AMDGPU::OpName::offset);
if (!OffsetImm)
return false;
const MachineOperand *SBaseReg =
getNamedOperand(LdSt, AMDGPU::OpName::sbase);
BaseReg = SBaseReg->getReg();
Offset = OffsetImm->getImm();
return true;
}
if (isFLAT(LdSt)) {
const MachineOperand *AddrReg = getNamedOperand(LdSt, AMDGPU::OpName::addr);
BaseReg = AddrReg->getReg();
Offset = 0;
return true;
}
return false;
}
bool SIInstrInfo::shouldClusterMemOps(MachineInstr &FirstLdSt,
MachineInstr &SecondLdSt,
unsigned NumLoads) const {
const MachineOperand *FirstDst = nullptr;
const MachineOperand *SecondDst = nullptr;
if (isDS(FirstLdSt) && isDS(SecondLdSt)) {
FirstDst = getNamedOperand(FirstLdSt, AMDGPU::OpName::vdst);
SecondDst = getNamedOperand(SecondLdSt, AMDGPU::OpName::vdst);
}
if (isSMRD(FirstLdSt) && isSMRD(SecondLdSt)) {
FirstDst = getNamedOperand(FirstLdSt, AMDGPU::OpName::sdst);
SecondDst = getNamedOperand(SecondLdSt, AMDGPU::OpName::sdst);
}
if ((isMUBUF(FirstLdSt) && isMUBUF(SecondLdSt)) ||
(isMTBUF(FirstLdSt) && isMTBUF(SecondLdSt))) {
FirstDst = getNamedOperand(FirstLdSt, AMDGPU::OpName::vdata);
SecondDst = getNamedOperand(SecondLdSt, AMDGPU::OpName::vdata);
}
if (!FirstDst || !SecondDst)
return false;
// Try to limit clustering based on the total number of bytes loaded
// rather than the number of instructions. This is done to help reduce
// register pressure. The method used is somewhat inexact, though,
// because it assumes that all loads in the cluster will load the
// same number of bytes as FirstLdSt.
// The unit of this value is bytes.
// FIXME: This needs finer tuning.
unsigned LoadClusterThreshold = 16;
const MachineRegisterInfo &MRI =
FirstLdSt.getParent()->getParent()->getRegInfo();
const TargetRegisterClass *DstRC = MRI.getRegClass(FirstDst->getReg());
return (NumLoads * DstRC->getSize()) <= LoadClusterThreshold;
}
void SIInstrInfo::copyPhysReg(MachineBasicBlock &MBB,
MachineBasicBlock::iterator MI,
const DebugLoc &DL, unsigned DestReg,
unsigned SrcReg, bool KillSrc) const {
const TargetRegisterClass *RC = RI.getPhysRegClass(DestReg);
if (RC == &AMDGPU::VGPR_32RegClass) {
assert(AMDGPU::VGPR_32RegClass.contains(SrcReg) ||
AMDGPU::SReg_32RegClass.contains(SrcReg));
BuildMI(MBB, MI, DL, get(AMDGPU::V_MOV_B32_e32), DestReg)
.addReg(SrcReg, getKillRegState(KillSrc));
return;
}
if (RC == &AMDGPU::SReg_32RegClass) {
if (SrcReg == AMDGPU::SCC) {
BuildMI(MBB, MI, DL, get(AMDGPU::S_CSELECT_B32), DestReg)
.addImm(-1)
.addImm(0);
return;
}
assert(AMDGPU::SReg_32RegClass.contains(SrcReg));
BuildMI(MBB, MI, DL, get(AMDGPU::S_MOV_B32), DestReg)
.addReg(SrcReg, getKillRegState(KillSrc));
return;
}
if (RC == &AMDGPU::SReg_64RegClass) {
if (DestReg == AMDGPU::VCC) {
if (AMDGPU::SReg_64RegClass.contains(SrcReg)) {
BuildMI(MBB, MI, DL, get(AMDGPU::S_MOV_B64), AMDGPU::VCC)
.addReg(SrcReg, getKillRegState(KillSrc));
} else {
// FIXME: Hack until VReg_1 removed.
assert(AMDGPU::VGPR_32RegClass.contains(SrcReg));
BuildMI(MBB, MI, DL, get(AMDGPU::V_CMP_NE_U32_e32))
.addImm(0)
.addReg(SrcReg, getKillRegState(KillSrc));
}
return;
}
assert(AMDGPU::SReg_64RegClass.contains(SrcReg));
BuildMI(MBB, MI, DL, get(AMDGPU::S_MOV_B64), DestReg)
.addReg(SrcReg, getKillRegState(KillSrc));
return;
}
if (DestReg == AMDGPU::SCC) {
assert(AMDGPU::SReg_32RegClass.contains(SrcReg));
BuildMI(MBB, MI, DL, get(AMDGPU::S_CMP_LG_U32))
.addReg(SrcReg, getKillRegState(KillSrc))
.addImm(0);
return;
}
unsigned EltSize = 4;
unsigned Opcode = AMDGPU::V_MOV_B32_e32;
if (RI.isSGPRClass(RC)) {
if (RC->getSize() > 4) {
Opcode = AMDGPU::S_MOV_B64;
EltSize = 8;
} else {
Opcode = AMDGPU::S_MOV_B32;
EltSize = 4;
}
}
ArrayRef<int16_t> SubIndices = RI.getRegSplitParts(RC, EltSize);
bool Forward = RI.getHWRegIndex(DestReg) <= RI.getHWRegIndex(SrcReg);
for (unsigned Idx = 0; Idx < SubIndices.size(); ++Idx) {
unsigned SubIdx;
if (Forward)
SubIdx = SubIndices[Idx];
else
SubIdx = SubIndices[SubIndices.size() - Idx - 1];
MachineInstrBuilder Builder = BuildMI(MBB, MI, DL,
get(Opcode), RI.getSubReg(DestReg, SubIdx));
Builder.addReg(RI.getSubReg(SrcReg, SubIdx));
if (Idx == SubIndices.size() - 1)
Builder.addReg(SrcReg, getKillRegState(KillSrc) | RegState::Implicit);
if (Idx == 0)
Builder.addReg(DestReg, RegState::Define | RegState::Implicit);
Builder.addReg(SrcReg, RegState::Implicit);
}
}
int SIInstrInfo::commuteOpcode(unsigned Opcode) const {
int NewOpc;
// Try to map original to commuted opcode
NewOpc = AMDGPU::getCommuteRev(Opcode);
if (NewOpc != -1)
// Check if the commuted (REV) opcode exists on the target.
return pseudoToMCOpcode(NewOpc) != -1 ? NewOpc : -1;
// Try to map commuted to original opcode
NewOpc = AMDGPU::getCommuteOrig(Opcode);
if (NewOpc != -1)
// Check if the original (non-REV) opcode exists on the target.
return pseudoToMCOpcode(NewOpc) != -1 ? NewOpc : -1;
return Opcode;
}
unsigned SIInstrInfo::getMovOpcode(const TargetRegisterClass *DstRC) const {
if (DstRC->getSize() == 4) {
return RI.isSGPRClass(DstRC) ? AMDGPU::S_MOV_B32 : AMDGPU::V_MOV_B32_e32;
} else if (DstRC->getSize() == 8 && RI.isSGPRClass(DstRC)) {
return AMDGPU::S_MOV_B64;
} else if (DstRC->getSize() == 8 && !RI.isSGPRClass(DstRC)) {
return AMDGPU::V_MOV_B64_PSEUDO;
}
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 12:
return AMDGPU::SI_SPILL_V96_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,
int FrameIndex,
const TargetRegisterClass *RC,
const TargetRegisterInfo *TRI) const {
MachineFunction *MF = MBB.getParent();
SIMachineFunctionInfo *MFI = MF->getInfo<SIMachineFunctionInfo>();
MachineFrameInfo &FrameInfo = MF->getFrameInfo();
DebugLoc DL = MBB.findDebugLoc(MI);
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.
const MCInstrDesc &OpDesc = get(getSGPRSpillSaveOpcode(RC->getSize()));
// The SGPR spill/restore instructions only work on number sgprs, so we need
// to make sure we are using the correct register class.
if (TargetRegisterInfo::isVirtualRegister(SrcReg) && RC->getSize() == 4) {
MachineRegisterInfo &MRI = MF->getRegInfo();
MRI.constrainRegClass(SrcReg, &AMDGPU::SReg_32_XM0RegClass);
}
BuildMI(MBB, MI, DL, OpDesc)
.addReg(SrcReg, getKillRegState(isKill)) // data
.addFrameIndex(FrameIndex) // addr
.addMemOperand(MMO)
.addReg(MFI->getScratchRSrcReg(), RegState::Implicit)
.addReg(MFI->getScratchWaveOffsetReg(), RegState::Implicit);
// Add the scratch resource registers as implicit uses because we may end up
// needing them, and need to ensure that the reserved registers are
// correctly handled.
return;
}
if (!ST.isVGPRSpillingEnabled(*MF->getFunction())) {
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);
return;
}
assert(RI.hasVGPRs(RC) && "Only VGPR spilling expected");
unsigned Opcode = getVGPRSpillSaveOpcode(RC->getSize());
MFI->setHasSpilledVGPRs();
BuildMI(MBB, MI, DL, get(Opcode))
.addReg(SrcReg, getKillRegState(isKill)) // data
.addFrameIndex(FrameIndex) // addr
.addReg(MFI->getScratchRSrcReg()) // scratch_rsrc
.addReg(MFI->getScratchWaveOffsetReg()) // scratch_offset
.addImm(0) // 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 12:
return AMDGPU::SI_SPILL_V96_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");
}
}
void SIInstrInfo::loadRegFromStackSlot(MachineBasicBlock &MBB,
MachineBasicBlock::iterator MI,
unsigned DestReg, int FrameIndex,
const TargetRegisterClass *RC,
const TargetRegisterInfo *TRI) const {
MachineFunction *MF = MBB.getParent();
const SIMachineFunctionInfo *MFI = MF->getInfo<SIMachineFunctionInfo>();
MachineFrameInfo &FrameInfo = MF->getFrameInfo();
DebugLoc DL = MBB.findDebugLoc(MI);
unsigned Align = FrameInfo.getObjectAlignment(FrameIndex);
unsigned Size = FrameInfo.getObjectSize(FrameIndex);
MachinePointerInfo PtrInfo
= MachinePointerInfo::getFixedStack(*MF, FrameIndex);
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.
const MCInstrDesc &OpDesc = get(getSGPRSpillRestoreOpcode(RC->getSize()));
if (TargetRegisterInfo::isVirtualRegister(DestReg) && RC->getSize() == 4) {
MachineRegisterInfo &MRI = MF->getRegInfo();
MRI.constrainRegClass(DestReg, &AMDGPU::SReg_32_XM0RegClass);
}
BuildMI(MBB, MI, DL, OpDesc, DestReg)
.addFrameIndex(FrameIndex) // addr
.addMemOperand(MMO)
.addReg(MFI->getScratchRSrcReg(), RegState::Implicit)
.addReg(MFI->getScratchWaveOffsetReg(), RegState::Implicit);
return;
}
if (!ST.isVGPRSpillingEnabled(*MF->getFunction())) {
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 Opcode = getVGPRSpillRestoreOpcode(RC->getSize());
BuildMI(MBB, MI, DL, get(Opcode), DestReg)
.addFrameIndex(FrameIndex) // vaddr
.addReg(MFI->getScratchRSrcReg()) // scratch_rsrc
.addReg(MFI->getScratchWaveOffsetReg()) // scratch_offset
.addImm(0) // offset
.addMemOperand(MMO);
}
/// \param @Offset Offset in bytes of the FrameIndex being spilled
unsigned SIInstrInfo::calculateLDSSpillAddress(
MachineBasicBlock &MBB, MachineInstr &MI, RegScavenger *RS, unsigned TmpReg,
unsigned FrameOffset, unsigned Size) const {
MachineFunction *MF = MBB.getParent();
SIMachineFunctionInfo *MFI = MF->getInfo<SIMachineFunctionInfo>();
const SISubtarget &ST = MF->getSubtarget<SISubtarget>();
const SIRegisterInfo *TRI = ST.getRegisterInfo();
DebugLoc DL = MBB.findDebugLoc(MI);
unsigned WorkGroupSize = MFI->getMaxFlatWorkGroupSize();
unsigned WavefrontSize = ST.getWavefrontSize();
unsigned TIDReg = MFI->getTIDReg();
if (!MFI->hasCalculatedTID()) {
MachineBasicBlock &Entry = MBB.getParent()->front();
MachineBasicBlock::iterator Insert = Entry.front();
DebugLoc DL = Insert->getDebugLoc();
TIDReg = RI.findUnusedRegister(MF->getRegInfo(), &AMDGPU::VGPR_32RegClass,
*MF);
if (TIDReg == AMDGPU::NoRegister)
return TIDReg;
if (!AMDGPU::isShader(MF->getFunction()->getCallingConv()) &&
WorkGroupSize > WavefrontSize) {
unsigned TIDIGXReg
= TRI->getPreloadedValue(*MF, SIRegisterInfo::WORKGROUP_ID_X);
unsigned TIDIGYReg
= TRI->getPreloadedValue(*MF, SIRegisterInfo::WORKGROUP_ID_Y);
unsigned TIDIGZReg
= TRI->getPreloadedValue(*MF, SIRegisterInfo::WORKGROUP_ID_Z);
unsigned InputPtrReg =
TRI->getPreloadedValue(*MF, SIRegisterInfo::KERNARG_SEGMENT_PTR);
for (unsigned Reg : {TIDIGXReg, TIDIGYReg, TIDIGZReg}) {
if (!Entry.isLiveIn(Reg))
Entry.addLiveIn(Reg);
}
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)
.addReg(InputPtrReg)
.addImm(SI::KernelInputOffsets::NGROUPS_Z);
BuildMI(Entry, Insert, DL, get(AMDGPU::S_LOAD_DWORD_IMM), STmp1)
.addReg(InputPtrReg)
.addImm(SI::KernelInputOffsets::NGROUPS_Y);
// NGROUPS.X * NGROUPS.Y
BuildMI(Entry, Insert, DL, get(AMDGPU::S_MUL_I32), STmp1)
.addReg(STmp1)
.addReg(STmp0);
// (NGROUPS.X * NGROUPS.Y) * TIDIG.X
BuildMI(Entry, Insert, DL, get(AMDGPU::V_MUL_U32_U24_e32), TIDReg)
.addReg(STmp1)
.addReg(TIDIGXReg);
// NGROUPS.Z * TIDIG.Y + (NGROUPS.X * NGROPUS.Y * TIDIG.X)
BuildMI(Entry, Insert, DL, get(AMDGPU::V_MAD_U32_U24), TIDReg)
.addReg(STmp0)
.addReg(TIDIGYReg)
.addReg(TIDReg);
// (NGROUPS.Z * TIDIG.Y + (NGROUPS.X * NGROPUS.Y * TIDIG.X)) + TIDIG.Z
BuildMI(Entry, Insert, DL, get(AMDGPU::V_ADD_I32_e32), TIDReg)
.addReg(TIDReg)
.addReg(TIDIGZReg);
} else {
// Get the wave id
BuildMI(Entry, Insert, DL, get(AMDGPU::V_MBCNT_LO_U32_B32_e64),
TIDReg)
.addImm(-1)
.addImm(0);
BuildMI(Entry, Insert, DL, get(AMDGPU::V_MBCNT_HI_U32_B32_e64),
TIDReg)
.addImm(-1)
.addReg(TIDReg);
}
BuildMI(Entry, Insert, DL, get(AMDGPU::V_LSHLREV_B32_e32),
TIDReg)
.addImm(2)
.addReg(TIDReg);
MFI->setTIDReg(TIDReg);
}
// Add FrameIndex to LDS offset
unsigned LDSOffset = MFI->getLDSSize() + (FrameOffset * WorkGroupSize);
BuildMI(MBB, MI, DL, get(AMDGPU::V_ADD_I32_e32), TmpReg)
.addImm(LDSOffset)
.addReg(TIDReg);
return TmpReg;
}
void SIInstrInfo::insertWaitStates(MachineBasicBlock &MBB,
MachineBasicBlock::iterator MI,
int Count) const {
DebugLoc DL = MBB.findDebugLoc(MI);
while (Count > 0) {
int Arg;
if (Count >= 8)
Arg = 7;
else
Arg = Count - 1;
Count -= 8;
BuildMI(MBB, MI, DL, get(AMDGPU::S_NOP))
.addImm(Arg);
}
}
void SIInstrInfo::insertNoop(MachineBasicBlock &MBB,
MachineBasicBlock::iterator MI) const {
insertWaitStates(MBB, MI, 1);
}
unsigned SIInstrInfo::getNumWaitStates(const MachineInstr &MI) const {
switch (MI.getOpcode()) {
default: return 1; // FIXME: Do wait states equal cycles?
case AMDGPU::S_NOP:
return MI.getOperand(0).getImm() + 1;
}
}
bool SIInstrInfo::expandPostRAPseudo(MachineInstr &MI) const {
MachineBasicBlock &MBB = *MI.getParent();
DebugLoc DL = MBB.findDebugLoc(MI);
switch (MI.getOpcode()) {
default: return AMDGPUInstrInfo::expandPostRAPseudo(MI);
case AMDGPU::S_MOV_B64_term: {
// This is only a terminator to get the correct spill code placement during
// register allocation.
MI.setDesc(get(AMDGPU::S_MOV_B64));
break;
}
case AMDGPU::S_XOR_B64_term: {
// This is only a terminator to get the correct spill code placement during
// register allocation.
MI.setDesc(get(AMDGPU::S_XOR_B64));
break;
}
case AMDGPU::S_ANDN2_B64_term: {
// This is only a terminator to get the correct spill code placement during
// register allocation.
MI.setDesc(get(AMDGPU::S_ANDN2_B64));
break;
}
case AMDGPU::V_MOV_B64_PSEUDO: {
unsigned Dst = MI.getOperand(0).getReg();
unsigned DstLo = RI.getSubReg(Dst, AMDGPU::sub0);
unsigned DstHi = RI.getSubReg(Dst, AMDGPU::sub1);
const MachineOperand &SrcOp = MI.getOperand(1);
// FIXME: Will this work for 64-bit floating point immediates?
assert(!SrcOp.isFPImm());
if (SrcOp.isImm()) {
APInt Imm(64, SrcOp.getImm());
BuildMI(MBB, MI, DL, get(AMDGPU::V_MOV_B32_e32), DstLo)
.addImm(Imm.getLoBits(32).getZExtValue())
.addReg(Dst, RegState::Implicit | RegState::Define);
BuildMI(MBB, MI, DL, get(AMDGPU::V_MOV_B32_e32), DstHi)
.addImm(Imm.getHiBits(32).getZExtValue())
.addReg(Dst, RegState::Implicit | RegState::Define);
} else {
assert(SrcOp.isReg());
BuildMI(MBB, MI, DL, get(AMDGPU::V_MOV_B32_e32), DstLo)
.addReg(RI.getSubReg(SrcOp.getReg(), AMDGPU::sub0))
.addReg(Dst, RegState::Implicit | RegState::Define);
BuildMI(MBB, MI, DL, get(AMDGPU::V_MOV_B32_e32), DstHi)
.addReg(RI.getSubReg(SrcOp.getReg(), AMDGPU::sub1))
.addReg(Dst, RegState::Implicit | RegState::Define);
}
MI.eraseFromParent();
break;
}
case AMDGPU::V_MOVRELD_B32_V1:
case AMDGPU::V_MOVRELD_B32_V2:
case AMDGPU::V_MOVRELD_B32_V4:
case AMDGPU::V_MOVRELD_B32_V8:
case AMDGPU::V_MOVRELD_B32_V16: {
const MCInstrDesc &MovRelDesc = get(AMDGPU::V_MOVRELD_B32_e32);
unsigned VecReg = MI.getOperand(0).getReg();
bool IsUndef = MI.getOperand(1).isUndef();
unsigned SubReg = AMDGPU::sub0 + MI.getOperand(3).getImm();
assert(VecReg == MI.getOperand(1).getReg());
MachineInstr *MovRel =
BuildMI(MBB, MI, DL, MovRelDesc)
.addReg(RI.getSubReg(VecReg, SubReg), RegState::Undef)
.addOperand(MI.getOperand(2))
.addReg(VecReg, RegState::ImplicitDefine)
.addReg(VecReg, RegState::Implicit | (IsUndef ? RegState::Undef : 0));
const int ImpDefIdx =
MovRelDesc.getNumOperands() + MovRelDesc.getNumImplicitUses();
const int ImpUseIdx = ImpDefIdx + 1;
MovRel->tieOperands(ImpDefIdx, ImpUseIdx);
MI.eraseFromParent();
break;
}
case AMDGPU::SI_PC_ADD_REL_OFFSET: {
MachineFunction &MF = *MBB.getParent();
unsigned Reg = MI.getOperand(0).getReg();
unsigned RegLo = RI.getSubReg(Reg, AMDGPU::sub0);
unsigned RegHi = RI.getSubReg(Reg, AMDGPU::sub1);
// Create a bundle so these instructions won't be re-ordered by the
// post-RA scheduler.
MIBundleBuilder Bundler(MBB, MI);
Bundler.append(BuildMI(MF, DL, get(AMDGPU::S_GETPC_B64), Reg));
// Add 32-bit offset from this instruction to the start of the
// constant data.
Bundler.append(BuildMI(MF, DL, get(AMDGPU::S_ADD_U32), RegLo)
.addReg(RegLo)
.addOperand(MI.getOperand(1)));
MachineInstrBuilder MIB = BuildMI(MF, DL, get(AMDGPU::S_ADDC_U32), RegHi)
.addReg(RegHi);
if (MI.getOperand(2).getTargetFlags() == SIInstrInfo::MO_NONE)
MIB.addImm(0);
else
MIB.addOperand(MI.getOperand(2));
Bundler.append(MIB);
llvm::finalizeBundle(MBB, Bundler.begin());
MI.eraseFromParent();
break;
}
}
return true;
}
bool SIInstrInfo::swapSourceModifiers(MachineInstr &MI,
MachineOperand &Src0,
unsigned Src0OpName,
MachineOperand &Src1,
unsigned Src1OpName) const {
MachineOperand *Src0Mods = getNamedOperand(MI, Src0OpName);
if (!Src0Mods)
return false;
MachineOperand *Src1Mods = getNamedOperand(MI, Src1OpName);
assert(Src1Mods &&
"All commutable instructions have both src0 and src1 modifiers");
int Src0ModsVal = Src0Mods->getImm();
int Src1ModsVal = Src1Mods->getImm();
Src1Mods->setImm(Src0ModsVal);
Src0Mods->setImm(Src1ModsVal);
return true;
}
static MachineInstr *swapRegAndNonRegOperand(MachineInstr &MI,
MachineOperand &RegOp,
MachineOperand &NonRegOp) {
unsigned Reg = RegOp.getReg();
unsigned SubReg = RegOp.getSubReg();
bool IsKill = RegOp.isKill();
bool IsDead = RegOp.isDead();
bool IsUndef = RegOp.isUndef();
bool IsDebug = RegOp.isDebug();
if (NonRegOp.isImm())
RegOp.ChangeToImmediate(NonRegOp.getImm());
else if (NonRegOp.isFI())
RegOp.ChangeToFrameIndex(NonRegOp.getIndex());
else
return nullptr;
NonRegOp.ChangeToRegister(Reg, false, false, IsKill, IsDead, IsUndef, IsDebug);
NonRegOp.setSubReg(SubReg);
return &MI;
}
MachineInstr *SIInstrInfo::commuteInstructionImpl(MachineInstr &MI, bool NewMI,
unsigned Src0Idx,
unsigned Src1Idx) const {
assert(!NewMI && "this should never be used");
unsigned Opc = MI.getOpcode();
int CommutedOpcode = commuteOpcode(Opc);
if (CommutedOpcode == -1)
return nullptr;
assert(AMDGPU::getNamedOperandIdx(Opc, AMDGPU::OpName::src0) ==
static_cast<int>(Src0Idx) &&
AMDGPU::getNamedOperandIdx(Opc, AMDGPU::OpName::src1) ==
static_cast<int>(Src1Idx) &&
"inconsistency with findCommutedOpIndices");
MachineOperand &Src0 = MI.getOperand(Src0Idx);
MachineOperand &Src1 = MI.getOperand(Src1Idx);
MachineInstr *CommutedMI = nullptr;
if (Src0.isReg() && Src1.isReg()) {
if (isOperandLegal(MI, Src1Idx, &Src0)) {
// Be sure to copy the source modifiers to the right place.
CommutedMI
= TargetInstrInfo::commuteInstructionImpl(MI, NewMI, Src0Idx, Src1Idx);
}
} else if (Src0.isReg() && !Src1.isReg()) {
// src0 should always be able to support any operand type, so no need to
// check operand legality.
CommutedMI = swapRegAndNonRegOperand(MI, Src0, Src1);
} else if (!Src0.isReg() && Src1.isReg()) {
if (isOperandLegal(MI, Src1Idx, &Src0))
CommutedMI = swapRegAndNonRegOperand(MI, Src1, Src0);
} else {
// FIXME: Found two non registers to commute. This does happen.
return nullptr;
}
if (CommutedMI) {
swapSourceModifiers(MI, Src0, AMDGPU::OpName::src0_modifiers,
Src1, AMDGPU::OpName::src1_modifiers);
CommutedMI->setDesc(get(CommutedOpcode));
}
return CommutedMI;
}
// This needs to be implemented because the source modifiers may be inserted
// between the true commutable operands, and the base
// TargetInstrInfo::commuteInstruction uses it.
bool SIInstrInfo::findCommutedOpIndices(MachineInstr &MI, unsigned &SrcOpIdx0,
unsigned &SrcOpIdx1) const {
if (!MI.isCommutable())
return false;
unsigned Opc = MI.getOpcode();
int Src0Idx = AMDGPU::getNamedOperandIdx(Opc, AMDGPU::OpName::src0);
if (Src0Idx == -1)
return false;
int Src1Idx = AMDGPU::getNamedOperandIdx(Opc, AMDGPU::OpName::src1);
if (Src1Idx == -1)
return false;
return fixCommutedOpIndices(SrcOpIdx0, SrcOpIdx1, Src0Idx, Src1Idx);
}
bool SIInstrInfo::isBranchOffsetInRange(unsigned BranchOp,
int64_t BrOffset) const {
// BranchRelaxation should never have to check s_setpc_b64 because its dest
// block is unanalyzable.
assert(BranchOp != AMDGPU::S_SETPC_B64);
// Convert to dwords.
BrOffset /= 4;
// The branch instructions do PC += signext(SIMM16 * 4) + 4, so the offset is
// from the next instruction.
BrOffset -= 1;
return isIntN(BranchOffsetBits, BrOffset);
}
MachineBasicBlock *SIInstrInfo::getBranchDestBlock(
const MachineInstr &MI) const {
if (MI.getOpcode() == AMDGPU::S_SETPC_B64) {
// This would be a difficult analysis to perform, but can always be legal so
// there's no need to analyze it.
return nullptr;
}
return MI.getOperand(0).getMBB();
}
unsigned SIInstrInfo::insertIndirectBranch(MachineBasicBlock &MBB,
MachineBasicBlock &DestBB,
const DebugLoc &DL,
int64_t BrOffset,
RegScavenger *RS) const {
assert(RS && "RegScavenger required for long branching");
assert(MBB.empty() &&
"new block should be inserted for expanding unconditional branch");
assert(MBB.pred_size() == 1);
MachineFunction *MF = MBB.getParent();
MachineRegisterInfo &MRI = MF->getRegInfo();
// FIXME: Virtual register workaround for RegScavenger not working with empty
// blocks.
unsigned PCReg = MRI.createVirtualRegister(&AMDGPU::SReg_64RegClass);
auto I = MBB.end();
// We need to compute the offset relative to the instruction immediately after
// s_getpc_b64. Insert pc arithmetic code before last terminator.
MachineInstr *GetPC = BuildMI(MBB, I, DL, get(AMDGPU::S_GETPC_B64), PCReg);
// TODO: Handle > 32-bit block address.
if (BrOffset >= 0) {
BuildMI(MBB, I, DL, get(AMDGPU::S_ADD_U32))
.addReg(PCReg, RegState::Define, AMDGPU::sub0)
.addReg(PCReg, 0, AMDGPU::sub0)
.addMBB(&DestBB, AMDGPU::TF_LONG_BRANCH_FORWARD);
BuildMI(MBB, I, DL, get(AMDGPU::S_ADDC_U32))
.addReg(PCReg, RegState::Define, AMDGPU::sub1)
.addReg(PCReg, 0, AMDGPU::sub1)
.addImm(0);
} else {
// Backwards branch.
BuildMI(MBB, I, DL, get(AMDGPU::S_SUB_U32))
.addReg(PCReg, RegState::Define, AMDGPU::sub0)
.addReg(PCReg, 0, AMDGPU::sub0)
.addMBB(&DestBB, AMDGPU::TF_LONG_BRANCH_BACKWARD);
BuildMI(MBB, I, DL, get(AMDGPU::S_SUBB_U32))
.addReg(PCReg, RegState::Define, AMDGPU::sub1)
.addReg(PCReg, 0, AMDGPU::sub1)
.addImm(0);
}
// Insert the indirect branch after the other terminator.
BuildMI(&MBB, DL, get(AMDGPU::S_SETPC_B64))
.addReg(PCReg);
// FIXME: If spilling is necessary, this will fail because this scavenger has
// no emergency stack slots. It is non-trivial to spill in this situation,
// because the restore code needs to be specially placed after the
// jump. BranchRelaxation then needs to be made aware of the newly inserted
// block.
//
// If a spill is needed for the pc register pair, we need to insert a spill
// restore block right before the destination block, and insert a short branch
// into the old destination block's fallthrough predecessor.
// e.g.:
//
// s_cbranch_scc0 skip_long_branch:
//
// long_branch_bb:
// spill s[8:9]
// s_getpc_b64 s[8:9]
// s_add_u32 s8, s8, restore_bb
// s_addc_u32 s9, s9, 0
// s_setpc_b64 s[8:9]
//
// skip_long_branch:
// foo;
//
// .....
//
// dest_bb_fallthrough_predecessor:
// bar;
// s_branch dest_bb
//
// restore_bb:
// restore s[8:9]
// fallthrough dest_bb
///
// dest_bb:
// buzz;
RS->enterBasicBlockEnd(MBB);
unsigned Scav = RS->scavengeRegister(&AMDGPU::SReg_64RegClass,
MachineBasicBlock::iterator(GetPC), 0);
MRI.replaceRegWith(PCReg, Scav);
MRI.clearVirtRegs();
RS->setRegUsed(Scav);
return 4 + 8 + 4 + 4;
}
unsigned SIInstrInfo::getBranchOpcode(SIInstrInfo::BranchPredicate Cond) {
switch (Cond) {
case SIInstrInfo::SCC_TRUE:
return AMDGPU::S_CBRANCH_SCC1;
case SIInstrInfo::SCC_FALSE:
return AMDGPU::S_CBRANCH_SCC0;
case SIInstrInfo::VCCNZ:
return AMDGPU::S_CBRANCH_VCCNZ;
case SIInstrInfo::VCCZ:
return AMDGPU::S_CBRANCH_VCCZ;
case SIInstrInfo::EXECNZ:
return AMDGPU::S_CBRANCH_EXECNZ;
case SIInstrInfo::EXECZ:
return AMDGPU::S_CBRANCH_EXECZ;
default:
llvm_unreachable("invalid branch predicate");
}
}
SIInstrInfo::BranchPredicate SIInstrInfo::getBranchPredicate(unsigned Opcode) {
switch (Opcode) {
case AMDGPU::S_CBRANCH_SCC0:
return SCC_FALSE;
case AMDGPU::S_CBRANCH_SCC1:
return SCC_TRUE;
case AMDGPU::S_CBRANCH_VCCNZ:
return VCCNZ;
case AMDGPU::S_CBRANCH_VCCZ:
return VCCZ;
case AMDGPU::S_CBRANCH_EXECNZ:
return EXECNZ;
case AMDGPU::S_CBRANCH_EXECZ:
return EXECZ;
default:
return INVALID_BR;
}
}
bool SIInstrInfo::analyzeBranchImpl(MachineBasicBlock &MBB,
MachineBasicBlock::iterator I,
MachineBasicBlock *&TBB,
MachineBasicBlock *&FBB,
SmallVectorImpl<MachineOperand> &Cond,
bool AllowModify) const {
if (I->getOpcode() == AMDGPU::S_BRANCH) {
// Unconditional Branch
TBB = I->getOperand(0).getMBB();
return false;
}
BranchPredicate Pred = getBranchPredicate(I->getOpcode());
if (Pred == INVALID_BR)
return true;
MachineBasicBlock *CondBB = I->getOperand(0).getMBB();
Cond.push_back(MachineOperand::CreateImm(Pred));
Cond.push_back(I->getOperand(1)); // Save the branch register.
++I;
if (I == MBB.end()) {
// Conditional branch followed by fall-through.
TBB = CondBB;
return false;
}
if (I->getOpcode() == AMDGPU::S_BRANCH) {
TBB = CondBB;
FBB = I->getOperand(0).getMBB();
return false;
}
return true;
}
bool SIInstrInfo::analyzeBranch(MachineBasicBlock &MBB, MachineBasicBlock *&TBB,
MachineBasicBlock *&FBB,
SmallVectorImpl<MachineOperand> &Cond,
bool AllowModify) const {
MachineBasicBlock::iterator I = MBB.getFirstTerminator();
if (I == MBB.end())
return false;
if (I->getOpcode() != AMDGPU::SI_MASK_BRANCH)
return analyzeBranchImpl(MBB, I, TBB, FBB, Cond, AllowModify);
++I;
// TODO: Should be able to treat as fallthrough?
if (I == MBB.end())
return true;
if (analyzeBranchImpl(MBB, I, TBB, FBB, Cond, AllowModify))
return true;
MachineBasicBlock *MaskBrDest = I->getOperand(0).getMBB();
// Specifically handle the case where the conditional branch is to the same
// destination as the mask branch. e.g.
//
// si_mask_branch BB8
// s_cbranch_execz BB8
// s_cbranch BB9
//
// This is required to understand divergent loops which may need the branches
// to be relaxed.
if (TBB != MaskBrDest || Cond.empty())
return true;
auto Pred = Cond[0].getImm();
return (Pred != EXECZ && Pred != EXECNZ);
}
unsigned SIInstrInfo::removeBranch(MachineBasicBlock &MBB,
int *BytesRemoved) const {
MachineBasicBlock::iterator I = MBB.getFirstTerminator();
unsigned Count = 0;
unsigned RemovedSize = 0;
while (I != MBB.end()) {
MachineBasicBlock::iterator Next = std::next(I);
if (I->getOpcode() == AMDGPU::SI_MASK_BRANCH) {
I = Next;
continue;
}
RemovedSize += getInstSizeInBytes(*I);
I->eraseFromParent();
++Count;
I = Next;
}
if (BytesRemoved)
*BytesRemoved = RemovedSize;
return Count;
}
unsigned SIInstrInfo::insertBranch(MachineBasicBlock &MBB,
MachineBasicBlock *TBB,
MachineBasicBlock *FBB,
ArrayRef<MachineOperand> Cond,
const DebugLoc &DL,
int *BytesAdded) const {
if (!FBB && Cond.empty()) {
BuildMI(&MBB, DL, get(AMDGPU::S_BRANCH))
.addMBB(TBB);
if (BytesAdded)
*BytesAdded = 4;
return 1;
}
assert(TBB && Cond[0].isImm());
unsigned Opcode
= getBranchOpcode(static_cast<BranchPredicate>(Cond[0].getImm()));
if (!FBB) {
Cond[1].isUndef();
MachineInstr *CondBr =
BuildMI(&MBB, DL, get(Opcode))
.addMBB(TBB);
// Copy the flags onto the implicit condition register operand.
MachineOperand &CondReg = CondBr->getOperand(1);
CondReg.setIsUndef(Cond[1].isUndef());
CondReg.setIsKill(Cond[1].isKill());
if (BytesAdded)
*BytesAdded = 4;
return 1;
}
assert(TBB && FBB);
MachineInstr *CondBr =
BuildMI(&MBB, DL, get(Opcode))
.addMBB(TBB);
BuildMI(&MBB, DL, get(AMDGPU::S_BRANCH))
.addMBB(FBB);
MachineOperand &CondReg = CondBr->getOperand(1);
CondReg.setIsUndef(Cond[1].isUndef());
CondReg.setIsKill(Cond[1].isKill());
if (BytesAdded)
*BytesAdded = 8;
return 2;
}
bool SIInstrInfo::reverseBranchCondition(
SmallVectorImpl<MachineOperand> &Cond) const {
assert(Cond.size() == 2);
Cond[0].setImm(-Cond[0].getImm());
return false;
}
static void removeModOperands(MachineInstr &MI) {
unsigned Opc = MI.getOpcode();
int Src0ModIdx = AMDGPU::getNamedOperandIdx(Opc,
AMDGPU::OpName::src0_modifiers);
int Src1ModIdx = AMDGPU::getNamedOperandIdx(Opc,
AMDGPU::OpName::src1_modifiers);
int Src2ModIdx = AMDGPU::getNamedOperandIdx(Opc,
AMDGPU::OpName::src2_modifiers);
MI.RemoveOperand(Src2ModIdx);
MI.RemoveOperand(Src1ModIdx);
MI.RemoveOperand(Src0ModIdx);
}
bool SIInstrInfo::FoldImmediate(MachineInstr &UseMI, MachineInstr &DefMI,
unsigned Reg, MachineRegisterInfo *MRI) const {
if (!MRI->hasOneNonDBGUse(Reg))
return false;
unsigned Opc = UseMI.getOpcode();
if (Opc == AMDGPU::COPY) {
bool isVGPRCopy = RI.isVGPR(*MRI, UseMI.getOperand(0).getReg());
switch (DefMI.getOpcode()) {
default:
return false;
case AMDGPU::S_MOV_B64:
// TODO: We could fold 64-bit immediates, but this get compilicated
// when there are sub-registers.
return false;
case AMDGPU::V_MOV_B32_e32:
case AMDGPU::S_MOV_B32:
break;
}
unsigned NewOpc = isVGPRCopy ? AMDGPU::V_MOV_B32_e32 : AMDGPU::S_MOV_B32;
const MachineOperand *ImmOp = getNamedOperand(DefMI, AMDGPU::OpName::src0);
assert(ImmOp);
// FIXME: We could handle FrameIndex values here.
if (!ImmOp->isImm()) {
return false;
}
UseMI.setDesc(get(NewOpc));
UseMI.getOperand(1).ChangeToImmediate(ImmOp->getImm());
UseMI.addImplicitDefUseOperands(*UseMI.getParent()->getParent());
return true;
}
if (Opc == AMDGPU::V_MAD_F32 || Opc == AMDGPU::V_MAC_F32_e64) {
// Don't fold if we are using source modifiers. The new VOP2 instructions
// don't have them.
if (hasModifiersSet(UseMI, AMDGPU::OpName::src0_modifiers) ||
hasModifiersSet(UseMI, AMDGPU::OpName::src1_modifiers) ||
hasModifiersSet(UseMI, AMDGPU::OpName::src2_modifiers)) {
return false;
}
const MachineOperand &ImmOp = DefMI.getOperand(1);
// If this is a free constant, there's no reason to do this.
// TODO: We could fold this here instead of letting SIFoldOperands do it
// later.
if (isInlineConstant(ImmOp, 4))
return false;
MachineOperand *Src0 = getNamedOperand(UseMI, AMDGPU::OpName::src0);
MachineOperand *Src1 = getNamedOperand(UseMI, AMDGPU::OpName::src1);
MachineOperand *Src2 = getNamedOperand(UseMI, AMDGPU::OpName::src2);
// Multiplied part is the constant: Use v_madmk_f32
// We should only expect these to be on src0 due to canonicalizations.
if (Src0->isReg() && Src0->getReg() == Reg) {
if (!Src1->isReg() || RI.isSGPRClass(MRI->getRegClass(Src1->getReg())))
return false;
if (!Src2->isReg() || RI.isSGPRClass(MRI->getRegClass(Src2->getReg())))
return false;
// We need to swap operands 0 and 1 since madmk constant is at operand 1.
const int64_t Imm = DefMI.getOperand(1).getImm();
// FIXME: This would be a lot easier if we could return a new instruction
// instead of having to modify in place.
// Remove these first since they are at the end.
UseMI.RemoveOperand(
AMDGPU::getNamedOperandIdx(Opc, AMDGPU::OpName::omod));
UseMI.RemoveOperand(
AMDGPU::getNamedOperandIdx(Opc, AMDGPU::OpName::clamp));
unsigned Src1Reg = Src1->getReg();
unsigned Src1SubReg = Src1->getSubReg();
Src0->setReg(Src1Reg);
Src0->setSubReg(Src1SubReg);
Src0->setIsKill(Src1->isKill());
if (Opc == AMDGPU::V_MAC_F32_e64) {
UseMI.untieRegOperand(
AMDGPU::getNamedOperandIdx(Opc, AMDGPU::OpName::src2));
}
Src1->ChangeToImmediate(Imm);
removeModOperands(UseMI);
UseMI.setDesc(get(AMDGPU::V_MADMK_F32));
bool DeleteDef = MRI->hasOneNonDBGUse(Reg);
if (DeleteDef)
DefMI.eraseFromParent();
return true;
}
// Added part is the constant: Use v_madak_f32
if (Src2->isReg() && Src2->getReg() == Reg) {
// Not allowed to use constant bus for another operand.
// We can however allow an inline immediate as src0.
if (!Src0->isImm() &&
(Src0->isReg() && RI.isSGPRClass(MRI->getRegClass(Src0->getReg()))))
return false;
if (!Src1->isReg() || RI.isSGPRClass(MRI->getRegClass(Src1->getReg())))
return false;
const int64_t Imm = DefMI.getOperand(1).getImm();
// FIXME: This would be a lot easier if we could return a new instruction
// instead of having to modify in place.
// Remove these first since they are at the end.
UseMI.RemoveOperand(
AMDGPU::getNamedOperandIdx(Opc, AMDGPU::OpName::omod));
UseMI.RemoveOperand(
AMDGPU::getNamedOperandIdx(Opc, AMDGPU::OpName::clamp));
if (Opc == AMDGPU::V_MAC_F32_e64) {
UseMI.untieRegOperand(
AMDGPU::getNamedOperandIdx(Opc, AMDGPU::OpName::src2));
}
// ChangingToImmediate adds Src2 back to the instruction.
Src2->ChangeToImmediate(Imm);
// These come before src2.
removeModOperands(UseMI);
UseMI.setDesc(get(AMDGPU::V_MADAK_F32));
bool DeleteDef = MRI->hasOneNonDBGUse(Reg);
if (DeleteDef)
DefMI.eraseFromParent();
return true;
}
}
return false;
}
static bool offsetsDoNotOverlap(int WidthA, int OffsetA,
int WidthB, int OffsetB) {
int LowOffset = OffsetA < OffsetB ? OffsetA : OffsetB;
int HighOffset = OffsetA < OffsetB ? OffsetB : OffsetA;
int LowWidth = (LowOffset == OffsetA) ? WidthA : WidthB;
return LowOffset + LowWidth <= HighOffset;
}
bool SIInstrInfo::checkInstOffsetsDoNotOverlap(MachineInstr &MIa,
MachineInstr &MIb) const {
unsigned BaseReg0, BaseReg1;
int64_t Offset0, Offset1;
if (getMemOpBaseRegImmOfs(MIa, BaseReg0, Offset0, &RI) &&
getMemOpBaseRegImmOfs(MIb, BaseReg1, Offset1, &RI)) {
if (!MIa.hasOneMemOperand() || !MIb.hasOneMemOperand()) {
// FIXME: Handle ds_read2 / ds_write2.
return false;
}
unsigned Width0 = (*MIa.memoperands_begin())->getSize();
unsigned Width1 = (*MIb.memoperands_begin())->getSize();
if (BaseReg0 == BaseReg1 &&
offsetsDoNotOverlap(Width0, Offset0, Width1, Offset1)) {
return true;
}
}
return false;
}
bool SIInstrInfo::areMemAccessesTriviallyDisjoint(MachineInstr &MIa,
MachineInstr &MIb,
AliasAnalysis *AA) const {
assert((MIa.mayLoad() || MIa.mayStore()) &&
"MIa must load from or modify a memory location");
assert((MIb.mayLoad() || MIb.mayStore()) &&
"MIb must load from or modify a memory location");
if (MIa.hasUnmodeledSideEffects() || MIb.hasUnmodeledSideEffects())
return false;
// XXX - Can we relax this between address spaces?
if (MIa.hasOrderedMemoryRef() || MIb.hasOrderedMemoryRef())
return false;
if (AA && MIa.hasOneMemOperand() && MIb.hasOneMemOperand()) {
const MachineMemOperand *MMOa = *MIa.memoperands_begin();
const MachineMemOperand *MMOb = *MIb.memoperands_begin();
if (MMOa->getValue() && MMOb->getValue()) {
MemoryLocation LocA(MMOa->getValue(), MMOa->getSize(), MMOa->getAAInfo());
MemoryLocation LocB(MMOb->getValue(), MMOb->getSize(), MMOb->getAAInfo());
if (!AA->alias(LocA, LocB))
return true;
}
}
// TODO: Should we check the address space from the MachineMemOperand? That
// would allow us to distinguish objects we know don't alias based on the
// underlying address space, even if it was lowered to a different one,
// e.g. private accesses lowered to use MUBUF instructions on a scratch
// buffer.
if (isDS(MIa)) {
if (isDS(MIb))
return checkInstOffsetsDoNotOverlap(MIa, MIb);
return !isFLAT(MIb);
}
if (isMUBUF(MIa) || isMTBUF(MIa)) {
if (isMUBUF(MIb) || isMTBUF(MIb))
return checkInstOffsetsDoNotOverlap(MIa, MIb);
return !isFLAT(MIb) && !isSMRD(MIb);
}
if (isSMRD(MIa)) {
if (isSMRD(MIb))
return checkInstOffsetsDoNotOverlap(MIa, MIb);
return !isFLAT(MIb) && !isMUBUF(MIa) && !isMTBUF(MIa);
}
if (isFLAT(MIa)) {
if (isFLAT(MIb))
return checkInstOffsetsDoNotOverlap(MIa, MIb);
return false;
}
return false;
}
MachineInstr *SIInstrInfo::convertToThreeAddress(MachineFunction::iterator &MBB,
MachineInstr &MI,
LiveVariables *LV) const {
switch (MI.getOpcode()) {
default:
return nullptr;
case AMDGPU::V_MAC_F32_e64:
break;
case AMDGPU::V_MAC_F32_e32: {
const MachineOperand *Src0 = getNamedOperand(MI, AMDGPU::OpName::src0);
if (Src0->isImm() && !isInlineConstant(*Src0, 4))
return nullptr;
break;
}
}
const MachineOperand *Dst = getNamedOperand(MI, AMDGPU::OpName::vdst);
const MachineOperand *Src0 = getNamedOperand(MI, AMDGPU::OpName::src0);
const MachineOperand *Src1 = getNamedOperand(MI, AMDGPU::OpName::src1);
const MachineOperand *Src2 = getNamedOperand(MI, AMDGPU::OpName::src2);
return BuildMI(*MBB, MI, MI.getDebugLoc(), get(AMDGPU::V_MAD_F32))
.addOperand(*Dst)
.addImm(0) // Src0 mods
.addOperand(*Src0)
.addImm(0) // Src1 mods
.addOperand(*Src1)
.addImm(0) // Src mods
.addOperand(*Src2)
.addImm(0) // clamp
.addImm(0); // omod
}
// It's not generally safe to move VALU instructions across these since it will
// start using the register as a base index rather than directly.
// XXX - Why isn't hasSideEffects sufficient for these?
static bool changesVGPRIndexingMode(const MachineInstr &MI) {
switch (MI.getOpcode()) {
case AMDGPU::S_SET_GPR_IDX_ON:
case AMDGPU::S_SET_GPR_IDX_MODE:
case AMDGPU::S_SET_GPR_IDX_OFF:
return true;
default:
return false;
}
}
bool SIInstrInfo::isSchedulingBoundary(const MachineInstr &MI,
const MachineBasicBlock *MBB,
const MachineFunction &MF) const {
// XXX - Do we want the SP check in the base implementation?
// Target-independent instructions do not have an implicit-use of EXEC, even
// when they operate on VGPRs. Treating EXEC modifications as scheduling
// boundaries prevents incorrect movements of such instructions.
return TargetInstrInfo::isSchedulingBoundary(MI, MBB, MF) ||
MI.modifiesRegister(AMDGPU::EXEC, &RI) ||
changesVGPRIndexingMode(MI);
}
bool SIInstrInfo::isInlineConstant(const APInt &Imm) const {
int64_t SVal = Imm.getSExtValue();
if (SVal >= -16 && SVal <= 64)
return true;
if (Imm.getBitWidth() == 64) {
uint64_t Val = Imm.getZExtValue();
return (DoubleToBits(0.0) == Val) ||
(DoubleToBits(1.0) == Val) ||
(DoubleToBits(-1.0) == Val) ||
(DoubleToBits(0.5) == Val) ||
(DoubleToBits(-0.5) == Val) ||
(DoubleToBits(2.0) == Val) ||
(DoubleToBits(-2.0) == Val) ||
(DoubleToBits(4.0) == Val) ||
(DoubleToBits(-4.0) == Val) ||
(ST.hasInv2PiInlineImm() && Val == 0x3fc45f306dc9c882);
}
// The actual type of the operand does not seem to matter as long
// as the bits match one of the inline immediate values. For example:
//
// -nan has the hexadecimal encoding of 0xfffffffe which is -2 in decimal,
// so it is a legal inline immediate.
//
// 1065353216 has the hexadecimal encoding 0x3f800000 which is 1.0f in
// floating-point, so it is a legal inline immediate.
uint32_t Val = Imm.getZExtValue();
return (FloatToBits(0.0f) == Val) ||
(FloatToBits(1.0f) == Val) ||
(FloatToBits(-1.0f) == Val) ||
(FloatToBits(0.5f) == Val) ||
(FloatToBits(-0.5f) == Val) ||
(FloatToBits(2.0f) == Val) ||
(FloatToBits(-2.0f) == Val) ||
(FloatToBits(4.0f) == Val) ||
(FloatToBits(-4.0f) == Val) ||
(ST.hasInv2PiInlineImm() && Val == 0x3e22f983);
}
bool SIInstrInfo::isInlineConstant(const MachineOperand &MO,
unsigned OpSize) const {
if (MO.isImm()) {
// MachineOperand provides no way to tell the true operand size, since it
// only records a 64-bit value. We need to know the size to determine if a
// 32-bit floating point immediate bit pattern is legal for an integer
// immediate. It would be for any 32-bit integer operand, but would not be
// for a 64-bit one.
unsigned BitSize = 8 * OpSize;
return isInlineConstant(APInt(BitSize, MO.getImm(), true));
}
return false;
}
bool SIInstrInfo::isLiteralConstant(const MachineOperand &MO,
unsigned OpSize) const {
return MO.isImm() && !isInlineConstant(MO, OpSize);
}
bool SIInstrInfo::isLiteralConstantLike(const MachineOperand &MO,
unsigned OpSize) const {
switch (MO.getType()) {
case MachineOperand::MO_Register:
return false;
case MachineOperand::MO_Immediate:
return !isInlineConstant(MO, OpSize);
case MachineOperand::MO_FrameIndex:
case MachineOperand::MO_MachineBasicBlock:
case MachineOperand::MO_ExternalSymbol:
case MachineOperand::MO_GlobalAddress:
case MachineOperand::MO_MCSymbol:
return true;
default:
llvm_unreachable("unexpected operand type");
}
}
static bool compareMachineOp(const MachineOperand &Op0,
const MachineOperand &Op1) {
if (Op0.getType() != Op1.getType())
return false;
switch (Op0.getType()) {
case MachineOperand::MO_Register:
return Op0.getReg() == Op1.getReg();
case MachineOperand::MO_Immediate:
return Op0.getImm() == Op1.getImm();
default:
llvm_unreachable("Didn't expect to be comparing these operand types");
}
}
bool SIInstrInfo::isImmOperandLegal(const MachineInstr &MI, unsigned OpNo,
const MachineOperand &MO) const {
const MCOperandInfo &OpInfo = get(MI.getOpcode()).OpInfo[OpNo];
assert(MO.isImm() || MO.isTargetIndex() || MO.isFI());
if (OpInfo.OperandType == MCOI::OPERAND_IMMEDIATE)
return true;
if (OpInfo.RegClass < 0)
return false;
unsigned OpSize = RI.getRegClass(OpInfo.RegClass)->getSize();
if (isLiteralConstant(MO, OpSize))
return RI.opCanUseLiteralConstant(OpInfo.OperandType);
return RI.opCanUseInlineConstant(OpInfo.OperandType);
}
bool SIInstrInfo::hasVALU32BitEncoding(unsigned Opcode) const {
int Op32 = AMDGPU::getVOPe32(Opcode);
if (Op32 == -1)
return false;
return pseudoToMCOpcode(Op32) != -1;
}
bool SIInstrInfo::hasModifiers(unsigned Opcode) const {
// The src0_modifier operand is present on all instructions
// that have modifiers.
return AMDGPU::getNamedOperandIdx(Opcode,
AMDGPU::OpName::src0_modifiers) != -1;
}
bool SIInstrInfo::hasModifiersSet(const MachineInstr &MI,
unsigned OpName) const {
const MachineOperand *Mods = getNamedOperand(MI, OpName);
return Mods && Mods->getImm();
}
bool SIInstrInfo::usesConstantBus(const MachineRegisterInfo &MRI,
const MachineOperand &MO,
unsigned OpSize) const {
// Literal constants use the constant bus.
if (isLiteralConstant(MO, OpSize))
return true;
if (!MO.isReg() || !MO.isUse())
return false;
if (TargetRegisterInfo::isVirtualRegister(MO.getReg()))
return RI.isSGPRClass(MRI.getRegClass(MO.getReg()));
// FLAT_SCR is just an SGPR pair.
if (!MO.isImplicit() && (MO.getReg() == AMDGPU::FLAT_SCR))
return true;
// EXEC register uses the constant bus.
if (!MO.isImplicit() && MO.getReg() == AMDGPU::EXEC)
return true;
// SGPRs use the constant bus
return (MO.getReg() == AMDGPU::VCC || MO.getReg() == AMDGPU::M0 ||
(!MO.isImplicit() &&
(AMDGPU::SGPR_32RegClass.contains(MO.getReg()) ||
AMDGPU::SGPR_64RegClass.contains(MO.getReg()))));
}
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;
}
static bool shouldReadExec(const MachineInstr &MI) {
if (SIInstrInfo::isVALU(MI)) {
switch (MI.getOpcode()) {
case AMDGPU::V_READLANE_B32:
case AMDGPU::V_READLANE_B32_si:
case AMDGPU::V_READLANE_B32_vi:
case AMDGPU::V_WRITELANE_B32:
case AMDGPU::V_WRITELANE_B32_si:
case AMDGPU::V_WRITELANE_B32_vi:
return false;
}
return true;
}
if (SIInstrInfo::isGenericOpcode(MI.getOpcode()) ||
SIInstrInfo::isSALU(MI) ||
SIInstrInfo::isSMRD(MI))
return false;
return true;
}
static bool isSubRegOf(const SIRegisterInfo &TRI,
const MachineOperand &SuperVec,
const MachineOperand &SubReg) {
if (TargetRegisterInfo::isPhysicalRegister(SubReg.getReg()))
return TRI.isSubRegister(SuperVec.getReg(), SubReg.getReg());
return SubReg.getSubReg() != AMDGPU::NoSubRegister &&
SubReg.getReg() == SuperVec.getReg();
}
bool SIInstrInfo::verifyInstruction(const MachineInstr &MI,
StringRef &ErrInfo) const {
uint16_t Opcode = MI.getOpcode();
const MachineRegisterInfo &MRI = MI.getParent()->getParent()->getRegInfo();
int Src0Idx = AMDGPU::getNamedOperandIdx(Opcode, AMDGPU::OpName::src0);
int Src1Idx = AMDGPU::getNamedOperandIdx(Opcode, AMDGPU::OpName::src1);
int Src2Idx = AMDGPU::getNamedOperandIdx(Opcode, AMDGPU::OpName::src2);
// Make sure the number of operands is correct.
const MCInstrDesc &Desc = get(Opcode);
if (!Desc.isVariadic() &&
Desc.getNumOperands() != MI.getNumExplicitOperands()) {
ErrInfo = "Instruction has wrong number of operands.";
return false;
}
if (MI.isInlineAsm()) {
// Verify register classes for inlineasm constraints.
for (unsigned I = InlineAsm::MIOp_FirstOperand, E = MI.getNumOperands();
I != E; ++I) {
const TargetRegisterClass *RC = MI.getRegClassConstraint(I, this, &RI);
if (!RC)
continue;
const MachineOperand &Op = MI.getOperand(I);
if (!Op.isReg())
continue;
unsigned Reg = Op.getReg();
if (!TargetRegisterInfo::isVirtualRegister(Reg) && !RC->contains(Reg)) {
ErrInfo = "inlineasm operand has incorrect register class.";
return false;
}
}
return true;
}
// Make sure the register classes are correct.
for (int i = 0, e = Desc.getNumOperands(); i != e; ++i) {
if (MI.getOperand(i).isFPImm()) {
ErrInfo = "FPImm Machine Operands are not supported. ISel should bitcast "
"all fp values to integers.";
return false;
}
int RegClass = Desc.OpInfo[i].RegClass;
switch (Desc.OpInfo[i].OperandType) {
case MCOI::OPERAND_REGISTER:
if (MI.getOperand(i).isImm()) {
ErrInfo = "Illegal immediate value for operand.";
return false;
}
break;
case AMDGPU::OPERAND_REG_IMM32_INT:
case AMDGPU::OPERAND_REG_IMM32_FP:
break;
case AMDGPU::OPERAND_REG_INLINE_C_INT:
case AMDGPU::OPERAND_REG_INLINE_C_FP:
if (isLiteralConstant(MI.getOperand(i),
RI.getRegClass(RegClass)->getSize())) {
ErrInfo = "Illegal immediate value for operand.";
return false;
}
break;
case MCOI::OPERAND_IMMEDIATE:
case AMDGPU::OPERAND_KIMM32:
// Check if this operand is an immediate.
// FrameIndex operands will be replaced by immediates, so they are
// allowed.
if (!MI.getOperand(i).isImm() && !MI.getOperand(i).isFI()) {
ErrInfo = "Expected immediate, but got non-immediate";
return false;
}
LLVM_FALLTHROUGH;
default:
continue;
}
if (!MI.getOperand(i).isReg())
continue;
if (RegClass != -1) {
unsigned Reg = MI.getOperand(i).getReg();
if (Reg == AMDGPU::NoRegister ||
TargetRegisterInfo::isVirtualRegister(Reg))
continue;
const TargetRegisterClass *RC = RI.getRegClass(RegClass);
if (!RC->contains(Reg)) {
ErrInfo = "Operand has incorrect register class.";
return false;
}
}
}
// Verify VOP*
if (isVOP1(MI) || isVOP2(MI) || isVOP3(MI) || isVOPC(MI)) {
// Only look at the true operands. Only a real operand can use the constant
// bus, and we don't want to check pseudo-operands like the source modifier
// flags.
const int OpIndices[] = { Src0Idx, Src1Idx, Src2Idx };
unsigned ConstantBusCount = 0;
if (AMDGPU::getNamedOperandIdx(Opcode, AMDGPU::OpName::imm) != -1)
++ConstantBusCount;
unsigned SGPRUsed = findImplicitSGPRRead(MI);
if (SGPRUsed != AMDGPU::NoRegister)
++ConstantBusCount;
for (int OpIdx : OpIndices) {
if (OpIdx == -1)
break;
const MachineOperand &MO = MI.getOperand(OpIdx);
if (usesConstantBus(MRI, MO, getOpSize(Opcode, OpIdx))) {
if (MO.isReg()) {
if (MO.getReg() != SGPRUsed)
++ConstantBusCount;
SGPRUsed = MO.getReg();
} else {
++ConstantBusCount;
}
}
}
if (ConstantBusCount > 1) {
ErrInfo = "VOP* instruction uses the constant bus more than once";
return false;
}
}
// Verify misc. restrictions on specific instructions.
if (Desc.getOpcode() == AMDGPU::V_DIV_SCALE_F32 ||
Desc.getOpcode() == AMDGPU::V_DIV_SCALE_F64) {
const MachineOperand &Src0 = MI.getOperand(Src0Idx);
const MachineOperand &Src1 = MI.getOperand(Src1Idx);
const MachineOperand &Src2 = MI.getOperand(Src2Idx);
if (Src0.isReg() && Src1.isReg() && Src2.isReg()) {
if (!compareMachineOp(Src0, Src1) &&
!compareMachineOp(Src0, Src2)) {
ErrInfo = "v_div_scale_{f32|f64} require src0 = src1 or src2";
return false;
}
}
}
if (isSOPK(MI)) {
int64_t Imm = getNamedOperand(MI, AMDGPU::OpName::simm16)->getImm();
if (sopkIsZext(MI)) {
if (!isUInt<16>(Imm)) {
ErrInfo = "invalid immediate for SOPK instruction";
return false;
}
} else {
if (!isInt<16>(Imm)) {
ErrInfo = "invalid immediate for SOPK instruction";
return false;
}
}
}
if (Desc.getOpcode() == AMDGPU::V_MOVRELS_B32_e32 ||
Desc.getOpcode() == AMDGPU::V_MOVRELS_B32_e64 ||
Desc.getOpcode() == AMDGPU::V_MOVRELD_B32_e32 ||
Desc.getOpcode() == AMDGPU::V_MOVRELD_B32_e64) {
const bool IsDst = Desc.getOpcode() == AMDGPU::V_MOVRELD_B32_e32 ||
Desc.getOpcode() == AMDGPU::V_MOVRELD_B32_e64;
const unsigned StaticNumOps = Desc.getNumOperands() +
Desc.getNumImplicitUses();
const unsigned NumImplicitOps = IsDst ? 2 : 1;
// Allow additional implicit operands. This allows a fixup done by the post
// RA scheduler where the main implicit operand is killed and implicit-defs
// are added for sub-registers that remain live after this instruction.
if (MI.getNumOperands() < StaticNumOps + NumImplicitOps) {
ErrInfo = "missing implicit register operands";
return false;
}
const MachineOperand *Dst = getNamedOperand(MI, AMDGPU::OpName::vdst);
if (IsDst) {
if (!Dst->isUse()) {
ErrInfo = "v_movreld_b32 vdst should be a use operand";
return false;
}
unsigned UseOpIdx;
if (!MI.isRegTiedToUseOperand(StaticNumOps, &UseOpIdx) ||
UseOpIdx != StaticNumOps + 1) {
ErrInfo = "movrel implicit operands should be tied";
return false;
}
}
const MachineOperand &Src0 = MI.getOperand(Src0Idx);
const MachineOperand &ImpUse
= MI.getOperand(StaticNumOps + NumImplicitOps - 1);
if (!ImpUse.isReg() || !ImpUse.isUse() ||
!isSubRegOf(RI, ImpUse, IsDst ? *Dst : Src0)) {
ErrInfo = "src0 should be subreg of implicit vector use";
return false;
}
}
// Make sure we aren't losing exec uses in the td files. This mostly requires
// being careful when using let Uses to try to add other use registers.
if (shouldReadExec(MI)) {
if (!MI.hasRegisterImplicitUseOperand(AMDGPU::EXEC)) {
ErrInfo = "VALU instruction does not implicitly read exec mask";
return false;
}
}
if (isSMRD(MI)) {
if (MI.mayStore()) {
// The register offset form of scalar stores may only use m0 as the
// soffset register.
const MachineOperand *Soff = getNamedOperand(MI, AMDGPU::OpName::soff);
if (Soff && Soff->getReg() != AMDGPU::M0) {
ErrInfo = "scalar stores must use m0 as offset register";
return false;
}
}
}
return true;
}
unsigned SIInstrInfo::getVALUOp(const MachineInstr &MI) {
switch (MI.getOpcode()) {
default: return AMDGPU::INSTRUCTION_LIST_END;
case AMDGPU::REG_SEQUENCE: return AMDGPU::REG_SEQUENCE;
case AMDGPU::COPY: return AMDGPU::COPY;
case AMDGPU::PHI: return AMDGPU::PHI;
case AMDGPU::INSERT_SUBREG: return AMDGPU::INSERT_SUBREG;
case AMDGPU::S_MOV_B32:
return MI.getOperand(1).isReg() ?
AMDGPU::COPY : AMDGPU::V_MOV_B32_e32;
case AMDGPU::S_ADD_I32:
case AMDGPU::S_ADD_U32: return AMDGPU::V_ADD_I32_e32;
case AMDGPU::S_ADDC_U32: return AMDGPU::V_ADDC_U32_e32;
case AMDGPU::S_SUB_I32:
case AMDGPU::S_SUB_U32: return AMDGPU::V_SUB_I32_e32;
case AMDGPU::S_SUBB_U32: return AMDGPU::V_SUBB_U32_e32;
case AMDGPU::S_MUL_I32: return AMDGPU::V_MUL_LO_I32;
case AMDGPU::S_AND_B32: return AMDGPU::V_AND_B32_e64;
case AMDGPU::S_OR_B32: return AMDGPU::V_OR_B32_e64;
case AMDGPU::S_XOR_B32: return AMDGPU::V_XOR_B32_e64;
case AMDGPU::S_MIN_I32: return AMDGPU::V_MIN_I32_e64;
case AMDGPU::S_MIN_U32: return AMDGPU::V_MIN_U32_e64;
case AMDGPU::S_MAX_I32: return AMDGPU::V_MAX_I32_e64;
case AMDGPU::S_MAX_U32: return AMDGPU::V_MAX_U32_e64;
case AMDGPU::S_ASHR_I32: return AMDGPU::V_ASHR_I32_e32;
case AMDGPU::S_ASHR_I64: return AMDGPU::V_ASHR_I64;
case AMDGPU::S_LSHL_B32: return AMDGPU::V_LSHL_B32_e32;
case AMDGPU::S_LSHL_B64: return AMDGPU::V_LSHL_B64;
case AMDGPU::S_LSHR_B32: return AMDGPU::V_LSHR_B32_e32;
case AMDGPU::S_LSHR_B64: return AMDGPU::V_LSHR_B64;
case AMDGPU::S_SEXT_I32_I8: return AMDGPU::V_BFE_I32;
case AMDGPU::S_SEXT_I32_I16: return AMDGPU::V_BFE_I32;
case AMDGPU::S_BFE_U32: return AMDGPU::V_BFE_U32;
case AMDGPU::S_BFE_I32: return AMDGPU::V_BFE_I32;
case AMDGPU::S_BFM_B32: return AMDGPU::V_BFM_B32_e64;
case AMDGPU::S_BREV_B32: return AMDGPU::V_BFREV_B32_e32;
case AMDGPU::S_NOT_B32: return AMDGPU::V_NOT_B32_e32;
case AMDGPU::S_NOT_B64: return AMDGPU::V_NOT_B32_e32;
case AMDGPU::S_CMP_EQ_I32: return AMDGPU::V_CMP_EQ_I32_e32;
case AMDGPU::S_CMP_LG_I32: return AMDGPU::V_CMP_NE_I32_e32;
case AMDGPU::S_CMP_GT_I32: return AMDGPU::V_CMP_GT_I32_e32;
case AMDGPU::S_CMP_GE_I32: return AMDGPU::V_CMP_GE_I32_e32;
case AMDGPU::S_CMP_LT_I32: return AMDGPU::V_CMP_LT_I32_e32;
case AMDGPU::S_CMP_LE_I32: return AMDGPU::V_CMP_LE_I32_e32;
case AMDGPU::S_CMP_EQ_U32: return AMDGPU::V_CMP_EQ_U32_e32;
case AMDGPU::S_CMP_LG_U32: return AMDGPU::V_CMP_NE_U32_e32;
case AMDGPU::S_CMP_GT_U32: return AMDGPU::V_CMP_GT_U32_e32;
case AMDGPU::S_CMP_GE_U32: return AMDGPU::V_CMP_GE_U32_e32;
case AMDGPU::S_CMP_LT_U32: return AMDGPU::V_CMP_LT_U32_e32;
case AMDGPU::S_CMP_LE_U32: return AMDGPU::V_CMP_LE_U32_e32;
case AMDGPU::S_CMP_EQ_U64: return AMDGPU::V_CMP_EQ_U64_e32;
case AMDGPU::S_CMP_LG_U64: return AMDGPU::V_CMP_NE_U64_e32;
case AMDGPU::S_BCNT1_I32_B32: return AMDGPU::V_BCNT_U32_B32_e64;
case AMDGPU::S_FF1_I32_B32: return AMDGPU::V_FFBL_B32_e32;
case AMDGPU::S_FLBIT_I32_B32: return AMDGPU::V_FFBH_U32_e32;
case AMDGPU::S_FLBIT_I32: return AMDGPU::V_FFBH_I32_e64;
case AMDGPU::S_CBRANCH_SCC0: return AMDGPU::S_CBRANCH_VCCZ;
case AMDGPU::S_CBRANCH_SCC1: return AMDGPU::S_CBRANCH_VCCNZ;
}
}
bool SIInstrInfo::isSALUOpSupportedOnVALU(const MachineInstr &MI) const {
return getVALUOp(MI) != AMDGPU::INSTRUCTION_LIST_END;
}
const TargetRegisterClass *SIInstrInfo::getOpRegClass(const MachineInstr &MI,
unsigned OpNo) const {
const MachineRegisterInfo &MRI = MI.getParent()->getParent()->getRegInfo();
const MCInstrDesc &Desc = get(MI.getOpcode());
if (MI.isVariadic() || OpNo >= Desc.getNumOperands() ||
Desc.OpInfo[OpNo].RegClass == -1) {
unsigned Reg = MI.getOperand(OpNo).getReg();
if (TargetRegisterInfo::isVirtualRegister(Reg))
return MRI.getRegClass(Reg);
return RI.getPhysRegClass(Reg);
}
unsigned RCID = Desc.OpInfo[OpNo].RegClass;
return RI.getRegClass(RCID);
}
bool SIInstrInfo::canReadVGPR(const MachineInstr &MI, unsigned OpNo) const {
switch (MI.getOpcode()) {
case AMDGPU::COPY:
case AMDGPU::REG_SEQUENCE:
case AMDGPU::PHI:
case AMDGPU::INSERT_SUBREG:
return RI.hasVGPRs(getOpRegClass(MI, 0));
default:
return RI.hasVGPRs(getOpRegClass(MI, OpNo));
}
}
void SIInstrInfo::legalizeOpWithMove(MachineInstr &MI, unsigned OpIdx) const {
MachineBasicBlock::iterator I = MI;
MachineBasicBlock *MBB = MI.getParent();
MachineOperand &MO = MI.getOperand(OpIdx);
MachineRegisterInfo &MRI = MBB->getParent()->getRegInfo();
unsigned RCID = get(MI.getOpcode()).OpInfo[OpIdx].RegClass;
const TargetRegisterClass *RC = RI.getRegClass(RCID);
unsigned Opcode = AMDGPU::V_MOV_B32_e32;
if (MO.isReg())
Opcode = AMDGPU::COPY;
else if (RI.isSGPRClass(RC))
Opcode = AMDGPU::S_MOV_B32;
const TargetRegisterClass *VRC = RI.getEquivalentVGPRClass(RC);
if (RI.getCommonSubClass(&AMDGPU::VReg_64RegClass, VRC))
VRC = &AMDGPU::VReg_64RegClass;
else
VRC = &AMDGPU::VGPR_32RegClass;
unsigned Reg = MRI.createVirtualRegister(VRC);
DebugLoc DL = MBB->findDebugLoc(I);
BuildMI(*MI.getParent(), I, DL, get(Opcode), Reg).addOperand(MO);
MO.ChangeToRegister(Reg, false);
}
unsigned SIInstrInfo::buildExtractSubReg(MachineBasicBlock::iterator MI,
MachineRegisterInfo &MRI,
MachineOperand &SuperReg,
const TargetRegisterClass *SuperRC,
unsigned SubIdx,
const TargetRegisterClass *SubRC)
const {
MachineBasicBlock *MBB = MI->getParent();
DebugLoc DL = MI->getDebugLoc();
unsigned SubReg = MRI.createVirtualRegister(SubRC);
if (SuperReg.getSubReg() == AMDGPU::NoSubRegister) {
BuildMI(*MBB, MI, DL, get(TargetOpcode::COPY), SubReg)
.addReg(SuperReg.getReg(), 0, SubIdx);
return SubReg;
}
// Just in case the super register is itself a sub-register, copy it to a new
// value so we don't need to worry about merging its subreg index with the
// SubIdx passed to this function. The register coalescer should be able to
// eliminate this extra copy.
unsigned NewSuperReg = MRI.createVirtualRegister(SuperRC);
BuildMI(*MBB, MI, DL, get(TargetOpcode::COPY), NewSuperReg)
.addReg(SuperReg.getReg(), 0, SuperReg.getSubReg());
BuildMI(*MBB, MI, DL, get(TargetOpcode::COPY), SubReg)
.addReg(NewSuperReg, 0, SubIdx);
return SubReg;
}
MachineOperand SIInstrInfo::buildExtractSubRegOrImm(
MachineBasicBlock::iterator MII,
MachineRegisterInfo &MRI,
MachineOperand &Op,
const TargetRegisterClass *SuperRC,
unsigned SubIdx,
const TargetRegisterClass *SubRC) const {
if (Op.isImm()) {
if (SubIdx == AMDGPU::sub0)
return MachineOperand::CreateImm(static_cast<int32_t>(Op.getImm()));
if (SubIdx == AMDGPU::sub1)
return MachineOperand::CreateImm(static_cast<int32_t>(Op.getImm() >> 32));
llvm_unreachable("Unhandled register index for immediate");
}
unsigned SubReg = buildExtractSubReg(MII, MRI, Op, SuperRC,
SubIdx, SubRC);
return MachineOperand::CreateReg(SubReg, false);
}
// Change the order of operands from (0, 1, 2) to (0, 2, 1)
void SIInstrInfo::swapOperands(MachineInstr &Inst) const {
assert(Inst.getNumExplicitOperands() == 3);
MachineOperand Op1 = Inst.getOperand(1);
Inst.RemoveOperand(1);
Inst.addOperand(Op1);
}
bool SIInstrInfo::isLegalRegOperand(const MachineRegisterInfo &MRI,
const MCOperandInfo &OpInfo,
const MachineOperand &MO) const {
if (!MO.isReg())
return false;
unsigned Reg = MO.getReg();
const TargetRegisterClass *RC =
TargetRegisterInfo::isVirtualRegister(Reg) ?
MRI.getRegClass(Reg) :
RI.getPhysRegClass(Reg);
const SIRegisterInfo *TRI =
static_cast<const SIRegisterInfo*>(MRI.getTargetRegisterInfo());
RC = TRI->getSubRegClass(RC, MO.getSubReg());
// In order to be legal, the common sub-class must be equal to the
// class of the current operand. For example:
//
// v_mov_b32 s0 ; Operand defined as vsrc_b32
// ; RI.getCommonSubClass(s0,vsrc_b32) = sgpr ; LEGAL
//
// s_sendmsg 0, s0 ; Operand defined as m0reg
// ; RI.getCommonSubClass(s0,m0reg) = m0reg ; NOT LEGAL
return RI.getCommonSubClass(RC, RI.getRegClass(OpInfo.RegClass)) == RC;
}
bool SIInstrInfo::isLegalVSrcOperand(const MachineRegisterInfo &MRI,
const MCOperandInfo &OpInfo,
const MachineOperand &MO) const {
if (MO.isReg())
return isLegalRegOperand(MRI, OpInfo, MO);
// Handle non-register types that are treated like immediates.
assert(MO.isImm() || MO.isTargetIndex() || MO.isFI());
return true;
}
bool SIInstrInfo::isOperandLegal(const MachineInstr &MI, unsigned OpIdx,
const MachineOperand *MO) const {
const MachineRegisterInfo &MRI = MI.getParent()->getParent()->getRegInfo();
const MCInstrDesc &InstDesc = MI.getDesc();
const MCOperandInfo &OpInfo = InstDesc.OpInfo[OpIdx];
const TargetRegisterClass *DefinedRC =
OpInfo.RegClass != -1 ? RI.getRegClass(OpInfo.RegClass) : nullptr;
if (!MO)
MO = &MI.getOperand(OpIdx);
if (isVALU(MI) && usesConstantBus(MRI, *MO, DefinedRC->getSize())) {
RegSubRegPair SGPRUsed;
if (MO->isReg())
SGPRUsed = RegSubRegPair(MO->getReg(), MO->getSubReg());
for (unsigned i = 0, e = MI.getNumOperands(); i != e; ++i) {
if (i == OpIdx)
continue;
const MachineOperand &Op = MI.getOperand(i);
if (Op.isReg()) {
if ((Op.getReg() != SGPRUsed.Reg || Op.getSubReg() != SGPRUsed.SubReg) &&
usesConstantBus(MRI, Op, getOpSize(MI, i))) {
return false;
}
} else if (InstDesc.OpInfo[i].OperandType == AMDGPU::OPERAND_KIMM32) {
return false;
}
}
}
if (MO->isReg()) {
assert(DefinedRC);
return isLegalRegOperand(MRI, OpInfo, *MO);
}
// Handle non-register types that are treated like immediates.
assert(MO->isImm() || MO->isTargetIndex() || MO->isFI());
if (!DefinedRC) {
// This operand expects an immediate.
return true;
}
return isImmOperandLegal(MI, OpIdx, *MO);
}
void SIInstrInfo::legalizeOperandsVOP2(MachineRegisterInfo &MRI,
MachineInstr &MI) const {
unsigned Opc = MI.getOpcode();
const MCInstrDesc &InstrDesc = get(Opc);
int Src1Idx = AMDGPU::getNamedOperandIdx(Opc, AMDGPU::OpName::src1);
MachineOperand &Src1 = MI.getOperand(Src1Idx);
// If there is an implicit SGPR use such as VCC use for v_addc_u32/v_subb_u32
// we need to only have one constant bus use.
//
// Note we do not need to worry about literal constants here. They are
// disabled for the operand type for instructions because they will always
// violate the one constant bus use rule.
bool HasImplicitSGPR = findImplicitSGPRRead(MI) != AMDGPU::NoRegister;
if (HasImplicitSGPR) {
int Src0Idx = AMDGPU::getNamedOperandIdx(Opc, AMDGPU::OpName::src0);
MachineOperand &Src0 = MI.getOperand(Src0Idx);
if (Src0.isReg() && RI.isSGPRReg(MRI, Src0.getReg()))
legalizeOpWithMove(MI, Src0Idx);
}
// VOP2 src0 instructions support all operand types, so we don't need to check
// their legality. If src1 is already legal, we don't need to do anything.
if (isLegalRegOperand(MRI, InstrDesc.OpInfo[Src1Idx], Src1))
return;
// We do not use commuteInstruction here because it is too aggressive and will
// commute if it is possible. We only want to commute here if it improves
// legality. This can be called a fairly large number of times so don't waste
// compile time pointlessly swapping and checking legality again.
if (HasImplicitSGPR || !MI.isCommutable()) {
legalizeOpWithMove(MI, Src1Idx);
return;
}
int Src0Idx = AMDGPU::getNamedOperandIdx(Opc, AMDGPU::OpName::src0);
MachineOperand &Src0 = MI.getOperand(Src0Idx);
// If src0 can be used as src1, commuting will make the operands legal.
// Otherwise we have to give up and insert a move.
//
// TODO: Other immediate-like operand kinds could be commuted if there was a
// MachineOperand::ChangeTo* for them.
if ((!Src1.isImm() && !Src1.isReg()) ||
!isLegalRegOperand(MRI, InstrDesc.OpInfo[Src1Idx], Src0)) {
legalizeOpWithMove(MI, Src1Idx);
return;
}
int CommutedOpc = commuteOpcode(MI);
if (CommutedOpc == -1) {
legalizeOpWithMove(MI, Src1Idx);
return;
}
MI.setDesc(get(CommutedOpc));
unsigned Src0Reg = Src0.getReg();
unsigned Src0SubReg = Src0.getSubReg();
bool Src0Kill = Src0.isKill();
if (Src1.isImm())
Src0.ChangeToImmediate(Src1.getImm());
else if (Src1.isReg()) {
Src0.ChangeToRegister(Src1.getReg(), false, false, Src1.isKill());
Src0.setSubReg(Src1.getSubReg());
} else
llvm_unreachable("Should only have register or immediate operands");
Src1.ChangeToRegister(Src0Reg, false, false, Src0Kill);
Src1.setSubReg(Src0SubReg);
}
// 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);
}
}
unsigned SIInstrInfo::readlaneVGPRToSGPR(unsigned SrcReg, MachineInstr &UseMI,
MachineRegisterInfo &MRI) const {
const TargetRegisterClass *VRC = MRI.getRegClass(SrcReg);
const TargetRegisterClass *SRC = RI.getEquivalentSGPRClass(VRC);
unsigned DstReg = MRI.createVirtualRegister(SRC);
unsigned SubRegs = VRC->getSize() / 4;
SmallVector<unsigned, 8> SRegs;
for (unsigned i = 0; i < SubRegs; ++i) {
unsigned SGPR = MRI.createVirtualRegister(&AMDGPU::SGPR_32RegClass);
BuildMI(*UseMI.getParent(), UseMI, UseMI.getDebugLoc(),
get(AMDGPU::V_READFIRSTLANE_B32), SGPR)
.addReg(SrcReg, 0, RI.getSubRegFromChannel(i));
SRegs.push_back(SGPR);
}
MachineInstrBuilder MIB =
BuildMI(*UseMI.getParent(), UseMI, UseMI.getDebugLoc(),
get(AMDGPU::REG_SEQUENCE), DstReg);
for (unsigned i = 0; i < SubRegs; ++i) {
MIB.addReg(SRegs[i]);
MIB.addImm(RI.getSubRegFromChannel(i));
}
return DstReg;
}
void SIInstrInfo::legalizeOperandsSMRD(MachineRegisterInfo &MRI,
MachineInstr &MI) const {
// If the pointer is store in VGPRs, then we need to move them to
// SGPRs using v_readfirstlane. This is safe because we only select
// loads with uniform pointers to SMRD instruction so we know the
// pointer value is uniform.
MachineOperand *SBase = getNamedOperand(MI, AMDGPU::OpName::sbase);
if (SBase && !RI.isSGPRClass(MRI.getRegClass(SBase->getReg()))) {
unsigned SGPR = readlaneVGPRToSGPR(SBase->getReg(), MI, MRI);
SBase->setReg(SGPR);
}
}
void SIInstrInfo::legalizeOperands(MachineInstr &MI) const {
MachineRegisterInfo &MRI = MI.getParent()->getParent()->getRegInfo();
// Legalize VOP2
if (isVOP2(MI) || isVOPC(MI)) {
legalizeOperandsVOP2(MRI, MI);
return;
}
// Legalize VOP3
if (isVOP3(MI)) {
legalizeOperandsVOP3(MRI, MI);
return;
}
// Legalize SMRD
if (isSMRD(MI)) {
legalizeOperandsSMRD(MRI, MI);
return;
}
// Legalize REG_SEQUENCE and PHI
// The register class of the operands much be the same type as the register
// class of the output.
if (MI.getOpcode() == AMDGPU::PHI) {
const TargetRegisterClass *RC = nullptr, *SRC = nullptr, *VRC = nullptr;
for (unsigned i = 1, e = MI.getNumOperands(); i != e; i += 2) {
if (!MI.getOperand(i).isReg() ||
!TargetRegisterInfo::isVirtualRegister(MI.getOperand(i).getReg()))
continue;
const TargetRegisterClass *OpRC =
MRI.getRegClass(MI.getOperand(i).getReg());
if (RI.hasVGPRs(OpRC)) {
VRC = OpRC;
} else {
SRC = OpRC;
}
}
// If any of the operands are VGPR registers, then they all most be
// otherwise we will create illegal VGPR->SGPR copies when legalizing
// them.
if (VRC || !RI.isSGPRClass(getOpRegClass(MI, 0))) {
if (!VRC) {
assert(SRC);
VRC = RI.getEquivalentVGPRClass(SRC);
}
RC = VRC;
} else {
RC = SRC;
}
// Update all the operands so they have the same type.
for (unsigned I = 1, E = MI.getNumOperands(); I != E; I += 2) {
MachineOperand &Op = MI.getOperand(I);
if (!Op.isReg() || !TargetRegisterInfo::isVirtualRegister(Op.getReg()))
continue;
unsigned DstReg = MRI.createVirtualRegister(RC);
// MI is a PHI instruction.
MachineBasicBlock *InsertBB = MI.getOperand(I + 1).getMBB();
MachineBasicBlock::iterator Insert = InsertBB->getFirstTerminator();
BuildMI(*InsertBB, Insert, MI.getDebugLoc(), get(AMDGPU::COPY), DstReg)
.addOperand(Op);
Op.setReg(DstReg);
}
}
// REG_SEQUENCE doesn't really require operand legalization, but if one has a
// VGPR dest type and SGPR sources, insert copies so all operands are
// VGPRs. This seems to help operand folding / the register coalescer.
if (MI.getOpcode() == AMDGPU::REG_SEQUENCE) {
MachineBasicBlock *MBB = MI.getParent();
const TargetRegisterClass *DstRC = getOpRegClass(MI, 0);
if (RI.hasVGPRs(DstRC)) {
// Update all the operands so they are VGPR register classes. These may
// not be the same register class because REG_SEQUENCE supports mixing
// subregister index types e.g. sub0_sub1 + sub2 + sub3
for (unsigned I = 1, E = MI.getNumOperands(); I != E; I += 2) {
MachineOperand &Op = MI.getOperand(I);
if (!Op.isReg() || !TargetRegisterInfo::isVirtualRegister(Op.getReg()))
continue;
const TargetRegisterClass *OpRC = MRI.getRegClass(Op.getReg());
const TargetRegisterClass *VRC = RI.getEquivalentVGPRClass(OpRC);
if (VRC == OpRC)
continue;
unsigned DstReg = MRI.createVirtualRegister(VRC);
BuildMI(*MBB, MI, MI.getDebugLoc(), get(AMDGPU::COPY), DstReg)
.addOperand(Op);
Op.setReg(DstReg);
Op.setIsKill();
}
}
return;
}
// Legalize INSERT_SUBREG
// src0 must have the same register class as dst
if (MI.getOpcode() == AMDGPU::INSERT_SUBREG) {
unsigned Dst = MI.getOperand(0).getReg();
unsigned Src0 = MI.getOperand(1).getReg();
const TargetRegisterClass *DstRC = MRI.getRegClass(Dst);
const TargetRegisterClass *Src0RC = MRI.getRegClass(Src0);
if (DstRC != Src0RC) {
MachineBasicBlock &MBB = *MI.getParent();
unsigned NewSrc0 = MRI.createVirtualRegister(DstRC);
BuildMI(MBB, MI, MI.getDebugLoc(), get(AMDGPU::COPY), NewSrc0)
.addReg(Src0);
MI.getOperand(1).setReg(NewSrc0);
}
return;
}
// Legalize MIMG
if (isMIMG(MI)) {
MachineOperand *SRsrc = getNamedOperand(MI, AMDGPU::OpName::srsrc);
if (SRsrc && !RI.isSGPRClass(MRI.getRegClass(SRsrc->getReg()))) {
unsigned SGPR = readlaneVGPRToSGPR(SRsrc->getReg(), MI, MRI);
SRsrc->setReg(SGPR);
}
MachineOperand *SSamp = getNamedOperand(MI, AMDGPU::OpName::ssamp);
if (SSamp && !RI.isSGPRClass(MRI.getRegClass(SSamp->getReg()))) {
unsigned SGPR = readlaneVGPRToSGPR(SSamp->getReg(), MI, MRI);
SSamp->setReg(SGPR);
}
return;
}
// Legalize MUBUF* instructions
// FIXME: If we start using the non-addr64 instructions for compute, we
// may need to legalize them here.
int SRsrcIdx =
AMDGPU::getNamedOperandIdx(MI.getOpcode(), AMDGPU::OpName::srsrc);
if (SRsrcIdx != -1) {
// We have an MUBUF instruction
MachineOperand *SRsrc = &MI.getOperand(SRsrcIdx);
unsigned SRsrcRC = get(MI.getOpcode()).OpInfo[SRsrcIdx].RegClass;
if (RI.getCommonSubClass(MRI.getRegClass(SRsrc->getReg()),
RI.getRegClass(SRsrcRC))) {
// The operands are legal.
// FIXME: We may need to legalize operands besided srsrc.
return;
}
MachineBasicBlock &MBB = *MI.getParent();
// Extract the ptr from the resource descriptor.
unsigned SRsrcPtr = buildExtractSubReg(MI, MRI, *SRsrc,
&AMDGPU::VReg_128RegClass, AMDGPU::sub0_sub1, &AMDGPU::VReg_64RegClass);
// Create an empty resource descriptor
unsigned Zero64 = MRI.createVirtualRegister(&AMDGPU::SReg_64RegClass);
unsigned SRsrcFormatLo = MRI.createVirtualRegister(&AMDGPU::SGPR_32RegClass);
unsigned SRsrcFormatHi = MRI.createVirtualRegister(&AMDGPU::SGPR_32RegClass);
unsigned NewSRsrc = MRI.createVirtualRegister(&AMDGPU::SReg_128RegClass);
uint64_t RsrcDataFormat = getDefaultRsrcDataFormat();
// Zero64 = 0
BuildMI(MBB, MI, MI.getDebugLoc(), get(AMDGPU::S_MOV_B64), Zero64)
.addImm(0);
// SRsrcFormatLo = RSRC_DATA_FORMAT{31-0}
BuildMI(MBB, MI, MI.getDebugLoc(), get(AMDGPU::S_MOV_B32), SRsrcFormatLo)
.addImm(RsrcDataFormat & 0xFFFFFFFF);
// SRsrcFormatHi = RSRC_DATA_FORMAT{63-32}
BuildMI(MBB, MI, MI.getDebugLoc(), get(AMDGPU::S_MOV_B32), SRsrcFormatHi)
.addImm(RsrcDataFormat >> 32);
// NewSRsrc = {Zero64, SRsrcFormat}
BuildMI(MBB, MI, MI.getDebugLoc(), get(AMDGPU::REG_SEQUENCE), NewSRsrc)
.addReg(Zero64)
.addImm(AMDGPU::sub0_sub1)
.addReg(SRsrcFormatLo)
.addImm(AMDGPU::sub2)
.addReg(SRsrcFormatHi)
.addImm(AMDGPU::sub3);
MachineOperand *VAddr = getNamedOperand(MI, AMDGPU::OpName::vaddr);
unsigned NewVAddr = MRI.createVirtualRegister(&AMDGPU::VReg_64RegClass);
if (VAddr) {
// This is already an ADDR64 instruction so we need to add the pointer
// extracted from the resource descriptor to the current value of VAddr.
unsigned NewVAddrLo = MRI.createVirtualRegister(&AMDGPU::VGPR_32RegClass);
unsigned NewVAddrHi = MRI.createVirtualRegister(&AMDGPU::VGPR_32RegClass);
// NewVaddrLo = SRsrcPtr:sub0 + VAddr:sub0
DebugLoc DL = MI.getDebugLoc();
BuildMI(MBB, MI, DL, get(AMDGPU::V_ADD_I32_e32), NewVAddrLo)
.addReg(SRsrcPtr, 0, AMDGPU::sub0)
.addReg(VAddr->getReg(), 0, AMDGPU::sub0);
// NewVaddrHi = SRsrcPtr:sub1 + VAddr:sub1
BuildMI(MBB, MI, DL, get(AMDGPU::V_ADDC_U32_e32), NewVAddrHi)
.addReg(SRsrcPtr, 0, AMDGPU::sub1)
.addReg(VAddr->getReg(), 0, AMDGPU::sub1);
// NewVaddr = {NewVaddrHi, NewVaddrLo}
BuildMI(MBB, MI, MI.getDebugLoc(), get(AMDGPU::REG_SEQUENCE), NewVAddr)
.addReg(NewVAddrLo)
.addImm(AMDGPU::sub0)
.addReg(NewVAddrHi)
.addImm(AMDGPU::sub1);
} else {
// This instructions is the _OFFSET variant, so we need to convert it to
// ADDR64.
assert(MBB.getParent()->getSubtarget<SISubtarget>().getGeneration()
< SISubtarget::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);
unsigned Addr64Opcode = AMDGPU::getAddr64Inst(MI.getOpcode());
// 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();
// NewVaddr = {NewVaddrHi, NewVaddrLo}
BuildMI(MBB, Addr64, Addr64->getDebugLoc(), get(AMDGPU::REG_SEQUENCE),
NewVAddr)
.addReg(SRsrcPtr, 0, AMDGPU::sub0)
.addImm(AMDGPU::sub0)
.addReg(SRsrcPtr, 0, AMDGPU::sub1)
.addImm(AMDGPU::sub1);
VAddr = getNamedOperand(*Addr64, AMDGPU::OpName::vaddr);
SRsrc = getNamedOperand(*Addr64, AMDGPU::OpName::srsrc);
}
// Update the instruction to use NewVaddr
VAddr->setReg(NewVAddr);
// Update the instruction to use NewSRsrc
SRsrc->setReg(NewSRsrc);
}
}
void SIInstrInfo::moveToVALU(MachineInstr &TopInst) const {
SmallVector<MachineInstr *, 128> Worklist;
Worklist.push_back(&TopInst);
while (!Worklist.empty()) {
MachineInstr &Inst = *Worklist.pop_back_val();
MachineBasicBlock *MBB = Inst.getParent();
MachineRegisterInfo &MRI = MBB->getParent()->getRegInfo();
unsigned Opcode = Inst.getOpcode();
unsigned NewOpcode = getVALUOp(Inst);
// Handle some special cases
switch (Opcode) {
default:
break;
case AMDGPU::S_AND_B64:
splitScalar64BitBinaryOp(Worklist, Inst, AMDGPU::V_AND_B32_e64);
Inst.eraseFromParent();
continue;
case AMDGPU::S_OR_B64:
splitScalar64BitBinaryOp(Worklist, Inst, AMDGPU::V_OR_B32_e64);
Inst.eraseFromParent();
continue;
case AMDGPU::S_XOR_B64:
splitScalar64BitBinaryOp(Worklist, Inst, AMDGPU::V_XOR_B32_e64);
Inst.eraseFromParent();
continue;
case AMDGPU::S_NOT_B64:
splitScalar64BitUnaryOp(Worklist, Inst, AMDGPU::V_NOT_B32_e32);
Inst.eraseFromParent();
continue;
case AMDGPU::S_BCNT1_I32_B64:
splitScalar64BitBCNT(Worklist, Inst);
Inst.eraseFromParent();
continue;
case AMDGPU::S_BFE_I64: {
splitScalar64BitBFE(Worklist, Inst);
Inst.eraseFromParent();
continue;
}
case AMDGPU::S_LSHL_B32:
if (ST.getGeneration() >= SISubtarget::VOLCANIC_ISLANDS) {
NewOpcode = AMDGPU::V_LSHLREV_B32_e64;
swapOperands(Inst);
}
break;
case AMDGPU::S_ASHR_I32:
if (ST.getGeneration() >= SISubtarget::VOLCANIC_ISLANDS) {
NewOpcode = AMDGPU::V_ASHRREV_I32_e64;
swapOperands(Inst);
}
break;
case AMDGPU::S_LSHR_B32:
if (ST.getGeneration() >= SISubtarget::VOLCANIC_ISLANDS) {
NewOpcode = AMDGPU::V_LSHRREV_B32_e64;
swapOperands(Inst);
}
break;
case AMDGPU::S_LSHL_B64:
if (ST.getGeneration() >= SISubtarget::VOLCANIC_ISLANDS) {
NewOpcode = AMDGPU::V_LSHLREV_B64;
swapOperands(Inst);
}
break;
case AMDGPU::S_ASHR_I64:
if (ST.getGeneration() >= SISubtarget::VOLCANIC_ISLANDS) {
NewOpcode = AMDGPU::V_ASHRREV_I64;
swapOperands(Inst);
}
break;
case AMDGPU::S_LSHR_B64:
if (ST.getGeneration() >= SISubtarget::VOLCANIC_ISLANDS) {
NewOpcode = AMDGPU::V_LSHRREV_B64;
swapOperands(Inst);
}
break;
case AMDGPU::S_ABS_I32:
lowerScalarAbs(Worklist, Inst);
Inst.eraseFromParent();
continue;
case AMDGPU::S_CBRANCH_SCC0:
case AMDGPU::S_CBRANCH_SCC1:
// Clear unused bits of vcc
BuildMI(*MBB, Inst, Inst.getDebugLoc(), get(AMDGPU::S_AND_B64),
AMDGPU::VCC)
.addReg(AMDGPU::EXEC)
.addReg(AMDGPU::VCC);
break;
case AMDGPU::S_BFE_U64:
case AMDGPU::S_BFM_B64:
llvm_unreachable("Moving this op to VALU not implemented");
}
if (NewOpcode == AMDGPU::INSTRUCTION_LIST_END) {
// We cannot move this instruction to the VALU, so we should try to
// legalize its operands instead.
legalizeOperands(Inst);
continue;
}
// Use the new VALU Opcode.
const MCInstrDesc &NewDesc = get(NewOpcode);
Inst.setDesc(NewDesc);
// Remove any references to SCC. Vector instructions can't read from it, and
// We're just about to add the implicit use / defs of VCC, and we don't want
// both.
for (unsigned i = Inst.getNumOperands() - 1; i > 0; --i) {
MachineOperand &Op = Inst.getOperand(i);
if (Op.isReg() && Op.getReg() == AMDGPU::SCC) {
Inst.RemoveOperand(i);
addSCCDefUsersToVALUWorklist(Inst, Worklist);
}
}
if (Opcode == AMDGPU::S_SEXT_I32_I8 || Opcode == AMDGPU::S_SEXT_I32_I16) {
// We are converting these to a BFE, so we need to add the missing
// operands for the size and offset.
unsigned Size = (Opcode == AMDGPU::S_SEXT_I32_I8) ? 8 : 16;
Inst.addOperand(MachineOperand::CreateImm(0));
Inst.addOperand(MachineOperand::CreateImm(Size));
} else if (Opcode == AMDGPU::S_BCNT1_I32_B32) {
// The VALU version adds the second operand to the result, so insert an
// extra 0 operand.
Inst.addOperand(MachineOperand::CreateImm(0));
}
Inst.addImplicitDefUseOperands(*Inst.getParent()->getParent());
if (Opcode == AMDGPU::S_BFE_I32 || Opcode == AMDGPU::S_BFE_U32) {
const MachineOperand &OffsetWidthOp = Inst.getOperand(2);
// If we need to move this to VGPRs, we need to unpack the second operand
// back into the 2 separate ones for bit offset and width.
assert(OffsetWidthOp.isImm() &&
"Scalar BFE is only implemented for constant width and offset");
uint32_t Imm = OffsetWidthOp.getImm();
uint32_t Offset = Imm & 0x3f; // Extract bits [5:0].
uint32_t BitWidth = (Imm & 0x7f0000) >> 16; // Extract bits [22:16].
Inst.RemoveOperand(2); // Remove old immediate.
Inst.addOperand(MachineOperand::CreateImm(Offset));
Inst.addOperand(MachineOperand::CreateImm(BitWidth));
}
bool HasDst = Inst.getOperand(0).isReg() && Inst.getOperand(0).isDef();
unsigned NewDstReg = AMDGPU::NoRegister;
if (HasDst) {
// Update the destination register class.
const TargetRegisterClass *NewDstRC = getDestEquivalentVGPRClass(Inst);
if (!NewDstRC)
continue;
unsigned DstReg = Inst.getOperand(0).getReg();
NewDstReg = MRI.createVirtualRegister(NewDstRC);
MRI.replaceRegWith(DstReg, NewDstReg);
}
// Legalize the operands
legalizeOperands(Inst);
if (HasDst)
addUsersToMoveToVALUWorklist(NewDstReg, MRI, Worklist);
}
}
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,
unsigned Opcode) const {
MachineBasicBlock &MBB = *Inst.getParent();
MachineRegisterInfo &MRI = MBB.getParent()->getRegInfo();
MachineOperand &Dest = Inst.getOperand(0);
MachineOperand &Src0 = Inst.getOperand(1);
DebugLoc DL = Inst.getDebugLoc();
MachineBasicBlock::iterator MII = Inst;
const MCInstrDesc &InstDesc = get(Opcode);
const TargetRegisterClass *Src0RC = Src0.isReg() ?
MRI.getRegClass(Src0.getReg()) :
&AMDGPU::SGPR_32RegClass;
const TargetRegisterClass *Src0SubRC = RI.getSubRegClass(Src0RC, AMDGPU::sub0);
MachineOperand SrcReg0Sub0 = buildExtractSubRegOrImm(MII, MRI, Src0, Src0RC,
AMDGPU::sub0, Src0SubRC);
const TargetRegisterClass *DestRC = MRI.getRegClass(Dest.getReg());
const TargetRegisterClass *NewDestRC = RI.getEquivalentVGPRClass(DestRC);
const TargetRegisterClass *NewDestSubRC = RI.getSubRegClass(NewDestRC, AMDGPU::sub0);
unsigned DestSub0 = MRI.createVirtualRegister(NewDestSubRC);
BuildMI(MBB, MII, DL, InstDesc, DestSub0)
.addOperand(SrcReg0Sub0);
MachineOperand SrcReg0Sub1 = buildExtractSubRegOrImm(MII, MRI, Src0, Src0RC,
AMDGPU::sub1, Src0SubRC);
unsigned DestSub1 = MRI.createVirtualRegister(NewDestSubRC);
BuildMI(MBB, MII, DL, InstDesc, DestSub1)
.addOperand(SrcReg0Sub1);
unsigned FullDestReg = MRI.createVirtualRegister(NewDestRC);
BuildMI(MBB, MII, DL, get(TargetOpcode::REG_SEQUENCE), FullDestReg)
.addReg(DestSub0)
.addImm(AMDGPU::sub0)
.addReg(DestSub1)
.addImm(AMDGPU::sub1);
MRI.replaceRegWith(Dest.getReg(), FullDestReg);
// We don't need to legalizeOperands here because for a single operand, src0
// will support any kind of input.
// Move all users of this moved value.
addUsersToMoveToVALUWorklist(FullDestReg, MRI, Worklist);
}
void SIInstrInfo::splitScalar64BitBinaryOp(
SmallVectorImpl<MachineInstr *> &Worklist, MachineInstr &Inst,
unsigned Opcode) const {
MachineBasicBlock &MBB = *Inst.getParent();
MachineRegisterInfo &MRI = MBB.getParent()->getRegInfo();
MachineOperand &Dest = Inst.getOperand(0);
MachineOperand &Src0 = Inst.getOperand(1);
MachineOperand &Src1 = Inst.getOperand(2);
DebugLoc DL = Inst.getDebugLoc();
MachineBasicBlock::iterator MII = Inst;
const MCInstrDesc &InstDesc = get(Opcode);
const TargetRegisterClass *Src0RC = Src0.isReg() ?
MRI.getRegClass(Src0.getReg()) :
&AMDGPU::SGPR_32RegClass;
const TargetRegisterClass *Src0SubRC = RI.getSubRegClass(Src0RC, AMDGPU::sub0);
const TargetRegisterClass *Src1RC = Src1.isReg() ?
MRI.getRegClass(Src1.getReg()) :
&AMDGPU::SGPR_32RegClass;
const TargetRegisterClass *Src1SubRC = RI.getSubRegClass(Src1RC, AMDGPU::sub0);
MachineOperand SrcReg0Sub0 = buildExtractSubRegOrImm(MII, MRI, Src0, Src0RC,
AMDGPU::sub0, Src0SubRC);
MachineOperand SrcReg1Sub0 = buildExtractSubRegOrImm(MII, MRI, Src1, Src1RC,
AMDGPU::sub0, Src1SubRC);
const TargetRegisterClass *DestRC = MRI.getRegClass(Dest.getReg());
const TargetRegisterClass *NewDestRC = RI.getEquivalentVGPRClass(DestRC);
const TargetRegisterClass *NewDestSubRC = RI.getSubRegClass(NewDestRC, AMDGPU::sub0);
unsigned DestSub0 = MRI.createVirtualRegister(NewDestSubRC);
MachineInstr &LoHalf = *BuildMI(MBB, MII, DL, InstDesc, DestSub0)
.addOperand(SrcReg0Sub0)
.addOperand(SrcReg1Sub0);
MachineOperand SrcReg0Sub1 = buildExtractSubRegOrImm(MII, MRI, Src0, Src0RC,
AMDGPU::sub1, Src0SubRC);
MachineOperand SrcReg1Sub1 = buildExtractSubRegOrImm(MII, MRI, Src1, Src1RC,
AMDGPU::sub1, Src1SubRC);
unsigned DestSub1 = MRI.createVirtualRegister(NewDestSubRC);
MachineInstr &HiHalf = *BuildMI(MBB, MII, DL, InstDesc, DestSub1)
.addOperand(SrcReg0Sub1)
.addOperand(SrcReg1Sub1);
unsigned FullDestReg = MRI.createVirtualRegister(NewDestRC);
BuildMI(MBB, MII, DL, get(TargetOpcode::REG_SEQUENCE), FullDestReg)
.addReg(DestSub0)
.addImm(AMDGPU::sub0)
.addReg(DestSub1)
.addImm(AMDGPU::sub1);
MRI.replaceRegWith(Dest.getReg(), FullDestReg);
// Try to legalize the operands in case we need to swap the order to keep it
// valid.
legalizeOperands(LoHalf);
legalizeOperands(HiHalf);
// Move all users of this moved vlaue.
addUsersToMoveToVALUWorklist(FullDestReg, MRI, Worklist);
}
void SIInstrInfo::splitScalar64BitBCNT(
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);
const MCInstrDesc &InstDesc = get(AMDGPU::V_BCNT_U32_B32_e64);
const TargetRegisterClass *SrcRC = Src.isReg() ?
MRI.getRegClass(Src.getReg()) :
&AMDGPU::SGPR_32RegClass;
unsigned MidReg = MRI.createVirtualRegister(&AMDGPU::VGPR_32RegClass);
unsigned ResultReg = MRI.createVirtualRegister(&AMDGPU::VGPR_32RegClass);
const TargetRegisterClass *SrcSubRC = RI.getSubRegClass(SrcRC, AMDGPU::sub0);
MachineOperand SrcRegSub0 = buildExtractSubRegOrImm(MII, MRI, Src, SrcRC,
AMDGPU::sub0, SrcSubRC);
MachineOperand SrcRegSub1 = buildExtractSubRegOrImm(MII, MRI, Src, SrcRC,
AMDGPU::sub1, SrcSubRC);
BuildMI(MBB, MII, DL, InstDesc, MidReg)
.addOperand(SrcRegSub0)
.addImm(0);
BuildMI(MBB, MII, DL, InstDesc, ResultReg)
.addOperand(SrcRegSub1)
.addReg(MidReg);
MRI.replaceRegWith(Dest.getReg(), ResultReg);
// We don't need to legalize operands here. src0 for etiher instruction can be
// an SGPR, and the second input is unused or determined here.
addUsersToMoveToVALUWorklist(ResultReg, MRI, Worklist);
}
void SIInstrInfo::splitScalar64BitBFE(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);
uint32_t Imm = Inst.getOperand(2).getImm();
uint32_t Offset = Imm & 0x3f; // Extract bits [5:0].
uint32_t BitWidth = (Imm & 0x7f0000) >> 16; // Extract bits [22:16].
(void) Offset;
// Only sext_inreg cases handled.
assert(Inst.getOpcode() == AMDGPU::S_BFE_I64 && BitWidth <= 32 &&
Offset == 0 && "Not implemented");
if (BitWidth < 32) {
unsigned MidRegLo = MRI.createVirtualRegister(&AMDGPU::VGPR_32RegClass);
unsigned MidRegHi = MRI.createVirtualRegister(&AMDGPU::VGPR_32RegClass);
unsigned ResultReg = MRI.createVirtualRegister(&AMDGPU::VReg_64RegClass);
BuildMI(MBB, MII, DL, get(AMDGPU::V_BFE_I32), MidRegLo)
.addReg(Inst.getOperand(1).getReg(), 0, AMDGPU::sub0)
.addImm(0)
.addImm(BitWidth);
BuildMI(MBB, MII, DL, get(AMDGPU::V_ASHRREV_I32_e32), MidRegHi)
.addImm(31)
.addReg(MidRegLo);
BuildMI(MBB, MII, DL, get(TargetOpcode::REG_SEQUENCE), ResultReg)
.addReg(MidRegLo)
.addImm(AMDGPU::sub0)
.addReg(MidRegHi)
.addImm(AMDGPU::sub1);
MRI.replaceRegWith(Dest.getReg(), ResultReg);
addUsersToMoveToVALUWorklist(ResultReg, MRI, Worklist);
return;
}
MachineOperand &Src = Inst.getOperand(1);
unsigned TmpReg = MRI.createVirtualRegister(&AMDGPU::VGPR_32RegClass);
unsigned ResultReg = MRI.createVirtualRegister(&AMDGPU::VReg_64RegClass);
BuildMI(MBB, MII, DL, get(AMDGPU::V_ASHRREV_I32_e64), TmpReg)
.addImm(31)
.addReg(Src.getReg(), 0, AMDGPU::sub0);
BuildMI(MBB, MII, DL, get(TargetOpcode::REG_SEQUENCE), ResultReg)
.addReg(Src.getReg(), 0, AMDGPU::sub0)
.addImm(AMDGPU::sub0)
.addReg(TmpReg)
.addImm(AMDGPU::sub1);
MRI.replaceRegWith(Dest.getReg(), ResultReg);
addUsersToMoveToVALUWorklist(ResultReg, MRI, Worklist);
}
void SIInstrInfo::addUsersToMoveToVALUWorklist(
unsigned DstReg,
MachineRegisterInfo &MRI,
SmallVectorImpl<MachineInstr *> &Worklist) const {
for (MachineRegisterInfo::use_iterator I = MRI.use_begin(DstReg),
E = MRI.use_end(); I != E; ++I) {
MachineInstr &UseMI = *I->getParent();
if (!canReadVGPR(UseMI, I.getOperandNo())) {
Worklist.push_back(&UseMI);
}
}
}
void SIInstrInfo::addSCCDefUsersToVALUWorklist(
MachineInstr &SCCDefInst, SmallVectorImpl<MachineInstr *> &Worklist) const {
// This assumes that all the users of SCC are in the same block
// as the SCC def.
for (MachineInstr &MI :
llvm::make_range(MachineBasicBlock::iterator(SCCDefInst),
SCCDefInst.getParent()->end())) {
// Exit if we find another SCC def.
if (MI.findRegisterDefOperandIdx(AMDGPU::SCC) != -1)
return;
if (MI.findRegisterUseOperandIdx(AMDGPU::SCC) != -1)
Worklist.push_back(&MI);
}
}
const TargetRegisterClass *SIInstrInfo::getDestEquivalentVGPRClass(
const MachineInstr &Inst) const {
const TargetRegisterClass *NewDstRC = getOpRegClass(Inst, 0);
switch (Inst.getOpcode()) {
// For target instructions, getOpRegClass just returns the virtual register
// class associated with the operand, so we need to find an equivalent VGPR
// register class in order to move the instruction to the VALU.
case AMDGPU::COPY:
case AMDGPU::PHI:
case AMDGPU::REG_SEQUENCE:
case AMDGPU::INSERT_SUBREG:
if (RI.hasVGPRs(NewDstRC))
return nullptr;
NewDstRC = RI.getEquivalentVGPRClass(NewDstRC);
if (!NewDstRC)
return nullptr;
return NewDstRC;
default:
return NewDstRC;
}
}
// Find the one SGPR operand we are allowed to use.
unsigned SIInstrInfo::findUsedSGPR(const MachineInstr &MI,
int OpIndices[3]) const {
const MCInstrDesc &Desc = MI.getDesc();
// Find the one SGPR operand we are allowed to use.
//
// 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
// one.
//
// If the operand's class is an SGPR, we can never move it.
unsigned SGPRReg = findImplicitSGPRRead(MI);
if (SGPRReg != AMDGPU::NoRegister)
return SGPRReg;
unsigned UsedSGPRs[3] = { AMDGPU::NoRegister };
const MachineRegisterInfo &MRI = MI.getParent()->getParent()->getRegInfo();
for (unsigned i = 0; i < 3; ++i) {
int Idx = OpIndices[i];
if (Idx == -1)
break;
const MachineOperand &MO = MI.getOperand(Idx);
if (!MO.isReg())
continue;
// 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 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.
// Try to select the most used SGPR. If an SGPR is equal to one of the
// others, we choose that.
//
// e.g.
// 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];
}
if (SGPRReg == AMDGPU::NoRegister && UsedSGPRs[1] != AMDGPU::NoRegister) {
if (UsedSGPRs[1] == UsedSGPRs[2])
SGPRReg = UsedSGPRs[1];
}
return SGPRReg;
}
MachineOperand *SIInstrInfo::getNamedOperand(MachineInstr &MI,
unsigned OperandName) const {
int Idx = AMDGPU::getNamedOperandIdx(MI.getOpcode(), OperandName);
if (Idx == -1)
return nullptr;
return &MI.getOperand(Idx);
}
uint64_t SIInstrInfo::getDefaultRsrcDataFormat() const {
uint64_t RsrcDataFormat = AMDGPU::RSRC_DATA_FORMAT;
if (ST.isAmdHsaOS()) {
RsrcDataFormat |= (1ULL << 56);
if (ST.getGeneration() >= SISubtarget::VOLCANIC_ISLANDS)
// Set MTYPE = 2
RsrcDataFormat |= (2ULL << 59);
}
return RsrcDataFormat;
}
uint64_t SIInstrInfo::getScratchRsrcWords23() const {
uint64_t Rsrc23 = getDefaultRsrcDataFormat() |
AMDGPU::RSRC_TID_ENABLE |
0xffffffff; // Size;
uint64_t EltSizeValue = Log2_32(ST.getMaxPrivateElementSize()) - 1;
Rsrc23 |= (EltSizeValue << AMDGPU::RSRC_ELEMENT_SIZE_SHIFT) |
// IndexStride = 64
(UINT64_C(3) << AMDGPU::RSRC_INDEX_STRIDE_SHIFT);
// If TID_ENABLE is set, DATA_FORMAT specifies stride bits [14:17].
// Clear them unless we want a huge stride.
if (ST.getGeneration() >= SISubtarget::VOLCANIC_ISLANDS)
Rsrc23 &= ~AMDGPU::RSRC_DATA_FORMAT;
return Rsrc23;
}
bool SIInstrInfo::isLowLatencyInstruction(const MachineInstr &MI) const {
unsigned Opc = MI.getOpcode();
return isSMRD(Opc);
}
bool SIInstrInfo::isHighLatencyInstruction(const MachineInstr &MI) const {
unsigned Opc = MI.getOpcode();
return isMUBUF(Opc) || isMTBUF(Opc) || isMIMG(Opc);
}
unsigned SIInstrInfo::isStackAccess(const MachineInstr &MI,
int &FrameIndex) const {
const MachineOperand *Addr = getNamedOperand(MI, AMDGPU::OpName::vaddr);
if (!Addr || !Addr->isFI())
return AMDGPU::NoRegister;
assert(!MI.memoperands_empty() &&
(*MI.memoperands_begin())->getAddrSpace() == AMDGPUAS::PRIVATE_ADDRESS);
FrameIndex = Addr->getIndex();
return getNamedOperand(MI, AMDGPU::OpName::vdata)->getReg();
}
unsigned SIInstrInfo::isSGPRStackAccess(const MachineInstr &MI,
int &FrameIndex) const {
const MachineOperand *Addr = getNamedOperand(MI, AMDGPU::OpName::addr);
assert(Addr && Addr->isFI());
FrameIndex = Addr->getIndex();
return getNamedOperand(MI, AMDGPU::OpName::data)->getReg();
}
unsigned SIInstrInfo::isLoadFromStackSlot(const MachineInstr &MI,
int &FrameIndex) const {
if (!MI.mayLoad())
return AMDGPU::NoRegister;
if (isMUBUF(MI) || isVGPRSpill(MI))
return isStackAccess(MI, FrameIndex);
if (isSGPRSpill(MI))
return isSGPRStackAccess(MI, FrameIndex);
return AMDGPU::NoRegister;
}
unsigned SIInstrInfo::isStoreToStackSlot(const MachineInstr &MI,
int &FrameIndex) const {
if (!MI.mayStore())
return AMDGPU::NoRegister;
if (isMUBUF(MI) || isVGPRSpill(MI))
return isStackAccess(MI, FrameIndex);
if (isSGPRSpill(MI))
return isSGPRStackAccess(MI, FrameIndex);
return AMDGPU::NoRegister;
}
unsigned SIInstrInfo::getInstSizeInBytes(const MachineInstr &MI) const {
unsigned Opc = MI.getOpcode();
const MCInstrDesc &Desc = getMCOpcodeFromPseudo(Opc);
unsigned DescSize = Desc.getSize();
// If we have a definitive size, we can use it. Otherwise we need to inspect
// the operands to know the size.
//
// FIXME: Instructions that have a base 32-bit encoding report their size as
// 4, even though they are really 8 bytes if they have a literal operand.
if (DescSize != 0 && DescSize != 4)
return DescSize;
// 4-byte instructions may have a 32-bit literal encoded after them. Check
// operands that coud ever be literals.
if (isVALU(MI) || isSALU(MI)) {
if (isFixedSize(MI)) {
assert(DescSize == 4);
return DescSize;
}
int Src0Idx = AMDGPU::getNamedOperandIdx(Opc, AMDGPU::OpName::src0);
if (Src0Idx == -1)
return 4; // No operands.
if (isLiteralConstantLike(MI.getOperand(Src0Idx), getOpSize(MI, Src0Idx)))
return 8;
int Src1Idx = AMDGPU::getNamedOperandIdx(Opc, AMDGPU::OpName::src1);
if (Src1Idx == -1)
return 4;
if (isLiteralConstantLike(MI.getOperand(Src1Idx), getOpSize(MI, Src1Idx)))
return 8;
return 4;
}
if (DescSize == 4)
return 4;
switch (Opc) {
case AMDGPU::SI_MASK_BRANCH:
case TargetOpcode::IMPLICIT_DEF:
case TargetOpcode::KILL:
case TargetOpcode::DBG_VALUE:
case TargetOpcode::BUNDLE:
case TargetOpcode::EH_LABEL:
return 0;
case TargetOpcode::INLINEASM: {
const MachineFunction *MF = MI.getParent()->getParent();
const char *AsmStr = MI.getOperand(0).getSymbolName();
return getInlineAsmLength(AsmStr, *MF->getTarget().getMCAsmInfo());
}
default:
llvm_unreachable("unable to find instruction size");
}
}
bool SIInstrInfo::mayAccessFlatAddressSpace(const MachineInstr &MI) const {
if (!isFLAT(MI))
return false;
if (MI.memoperands_empty())
return true;
for (const MachineMemOperand *MMO : MI.memoperands()) {
if (MMO->getAddrSpace() == AMDGPUAS::FLAT_ADDRESS)
return true;
}
return false;
}
ArrayRef<std::pair<int, const char *>>
SIInstrInfo::getSerializableTargetIndices() const {
static const std::pair<int, const char *> TargetIndices[] = {
{AMDGPU::TI_CONSTDATA_START, "amdgpu-constdata-start"},
{AMDGPU::TI_SCRATCH_RSRC_DWORD0, "amdgpu-scratch-rsrc-dword0"},
{AMDGPU::TI_SCRATCH_RSRC_DWORD1, "amdgpu-scratch-rsrc-dword1"},
{AMDGPU::TI_SCRATCH_RSRC_DWORD2, "amdgpu-scratch-rsrc-dword2"},
{AMDGPU::TI_SCRATCH_RSRC_DWORD3, "amdgpu-scratch-rsrc-dword3"}};
return makeArrayRef(TargetIndices);
}
/// This is used by the post-RA scheduler (SchedulePostRAList.cpp). The
/// post-RA version of misched uses CreateTargetMIHazardRecognizer.
ScheduleHazardRecognizer *
SIInstrInfo::CreateTargetPostRAHazardRecognizer(const InstrItineraryData *II,
const ScheduleDAG *DAG) const {
return new GCNHazardRecognizer(DAG->MF);
}
/// This is the hazard recognizer used at -O0 by the PostRAHazardRecognizer
/// pass.
ScheduleHazardRecognizer *
SIInstrInfo::CreateTargetPostRAHazardRecognizer(const MachineFunction &MF) const {
return new GCNHazardRecognizer(MF);
}
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