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

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//===-- AMDGPUISelDAGToDAG.cpp - A dag to dag inst selector for AMDGPU ----===//
//
// The LLVM Compiler Infrastructure
//
// This file is distributed under the University of Illinois Open Source
// License. See LICENSE.TXT for details.
//
//==-----------------------------------------------------------------------===//
//
/// \file
/// \brief Defines an instruction selector for the AMDGPU target.
//
//===----------------------------------------------------------------------===//
#include "AMDGPU.h"
#include "AMDGPUInstrInfo.h"
#include "AMDGPURegisterInfo.h"
#include "AMDGPUISelLowering.h" // For AMDGPUISD
#include "AMDGPUSubtarget.h"
#include "SIDefines.h"
#include "SIInstrInfo.h"
#include "SIRegisterInfo.h"
#include "SIISelLowering.h"
#include "SIMachineFunctionInfo.h"
#include "llvm/ADT/APInt.h"
#include "llvm/ADT/SmallVector.h"
#include "llvm/ADT/StringRef.h"
#include "llvm/Analysis/ValueTracking.h"
#include "llvm/CodeGen/FunctionLoweringInfo.h"
#include "llvm/CodeGen/ISDOpcodes.h"
#include "llvm/CodeGen/MachineFunction.h"
#include "llvm/CodeGen/MachineRegisterInfo.h"
#include "llvm/CodeGen/MachineValueType.h"
#include "llvm/CodeGen/SelectionDAG.h"
#include "llvm/CodeGen/SelectionDAGISel.h"
#include "llvm/CodeGen/SelectionDAGNodes.h"
#include "llvm/CodeGen/ValueTypes.h"
#include "llvm/IR/BasicBlock.h"
#include "llvm/IR/Instruction.h"
#include "llvm/MC/MCInstrDesc.h"
#include "llvm/Support/Casting.h"
#include "llvm/Support/CodeGen.h"
#include "llvm/Support/ErrorHandling.h"
#include "llvm/Support/MathExtras.h"
#include <cassert>
#include <cstdint>
#include <new>
#include <vector>
using namespace llvm;
namespace llvm {
class R600InstrInfo;
} // end namespace llvm
//===----------------------------------------------------------------------===//
// Instruction Selector Implementation
//===----------------------------------------------------------------------===//
namespace {
/// AMDGPU specific code to select AMDGPU machine instructions for
/// SelectionDAG operations.
class AMDGPUDAGToDAGISel : public SelectionDAGISel {
// Subtarget - Keep a pointer to the AMDGPU Subtarget around so that we can
// make the right decision when generating code for different targets.
const AMDGPUSubtarget *Subtarget;
AMDGPUAS AMDGPUASI;
public:
explicit AMDGPUDAGToDAGISel(TargetMachine &TM, CodeGenOpt::Level OptLevel)
: SelectionDAGISel(TM, OptLevel){
AMDGPUASI = AMDGPU::getAMDGPUAS(TM);
}
~AMDGPUDAGToDAGISel() override = default;
bool runOnMachineFunction(MachineFunction &MF) override;
void Select(SDNode *N) override;
StringRef getPassName() const override;
void PostprocessISelDAG() override;
private:
SDValue foldFrameIndex(SDValue N) const;
bool isNoNanSrc(SDValue N) const;
bool isInlineImmediate(const SDNode *N) const;
bool FoldOperand(SDValue &Src, SDValue &Sel, SDValue &Neg, SDValue &Abs,
const R600InstrInfo *TII);
bool FoldOperands(unsigned, const R600InstrInfo *, std::vector<SDValue> &);
bool FoldDotOperands(unsigned, const R600InstrInfo *, std::vector<SDValue> &);
bool isConstantLoad(const MemSDNode *N, int cbID) const;
bool isUniformBr(const SDNode *N) const;
SDNode *glueCopyToM0(SDNode *N) const;
const TargetRegisterClass *getOperandRegClass(SDNode *N, unsigned OpNo) const;
bool SelectGlobalValueConstantOffset(SDValue Addr, SDValue& IntPtr);
bool SelectGlobalValueVariableOffset(SDValue Addr, SDValue &BaseReg,
SDValue& Offset);
bool SelectADDRVTX_READ(SDValue Addr, SDValue &Base, SDValue &Offset);
bool SelectADDRIndirect(SDValue Addr, SDValue &Base, SDValue &Offset);
bool isDSOffsetLegal(const SDValue &Base, unsigned Offset,
unsigned OffsetBits) const;
bool SelectDS1Addr1Offset(SDValue Ptr, SDValue &Base, SDValue &Offset) const;
bool SelectDS64Bit4ByteAligned(SDValue Ptr, SDValue &Base, SDValue &Offset0,
SDValue &Offset1) const;
bool SelectMUBUF(SDValue Addr, SDValue &SRsrc, SDValue &VAddr,
SDValue &SOffset, SDValue &Offset, SDValue &Offen,
SDValue &Idxen, SDValue &Addr64, SDValue &GLC, SDValue &SLC,
SDValue &TFE) const;
bool SelectMUBUFAddr64(SDValue Addr, SDValue &SRsrc, SDValue &VAddr,
SDValue &SOffset, SDValue &Offset, SDValue &GLC,
SDValue &SLC, SDValue &TFE) const;
bool SelectMUBUFAddr64(SDValue Addr, SDValue &SRsrc,
SDValue &VAddr, SDValue &SOffset, SDValue &Offset,
SDValue &SLC) const;
bool SelectMUBUFScratch(SDValue Addr, SDValue &RSrc, SDValue &VAddr,
SDValue &SOffset, SDValue &ImmOffset) const;
bool SelectMUBUFOffset(SDValue Addr, SDValue &SRsrc, SDValue &SOffset,
SDValue &Offset, SDValue &GLC, SDValue &SLC,
SDValue &TFE) const;
bool SelectMUBUFOffset(SDValue Addr, SDValue &SRsrc, SDValue &Soffset,
SDValue &Offset, SDValue &SLC) const;
bool SelectMUBUFOffset(SDValue Addr, SDValue &SRsrc, SDValue &Soffset,
SDValue &Offset) const;
bool SelectMUBUFConstant(SDValue Constant,
SDValue &SOffset,
SDValue &ImmOffset) const;
bool SelectMUBUFIntrinsicOffset(SDValue Offset, SDValue &SOffset,
SDValue &ImmOffset) const;
bool SelectMUBUFIntrinsicVOffset(SDValue Offset, SDValue &SOffset,
SDValue &ImmOffset, SDValue &VOffset) const;
bool SelectFlat(SDValue Addr, SDValue &VAddr,
SDValue &SLC, SDValue &TFE) const;
bool SelectSMRDOffset(SDValue ByteOffsetNode, SDValue &Offset,
bool &Imm) const;
bool SelectSMRD(SDValue Addr, SDValue &SBase, SDValue &Offset,
bool &Imm) const;
bool SelectSMRDImm(SDValue Addr, SDValue &SBase, SDValue &Offset) const;
bool SelectSMRDImm32(SDValue Addr, SDValue &SBase, SDValue &Offset) const;
bool SelectSMRDSgpr(SDValue Addr, SDValue &SBase, SDValue &Offset) const;
bool SelectSMRDBufferImm(SDValue Addr, SDValue &Offset) const;
bool SelectSMRDBufferImm32(SDValue Addr, SDValue &Offset) const;
bool SelectSMRDBufferSgpr(SDValue Addr, SDValue &Offset) const;
bool SelectMOVRELOffset(SDValue Index, SDValue &Base, SDValue &Offset) const;
bool SelectVOP3Mods_NNaN(SDValue In, SDValue &Src, SDValue &SrcMods) const;
bool SelectVOP3Mods(SDValue In, SDValue &Src, SDValue &SrcMods) const;
bool SelectVOP3NoMods(SDValue In, SDValue &Src, SDValue &SrcMods) const;
bool SelectVOP3Mods0(SDValue In, SDValue &Src, SDValue &SrcMods,
SDValue &Clamp, SDValue &Omod) const;
bool SelectVOP3NoMods0(SDValue In, SDValue &Src, SDValue &SrcMods,
SDValue &Clamp, SDValue &Omod) const;
bool SelectVOP3Mods0Clamp(SDValue In, SDValue &Src, SDValue &SrcMods,
SDValue &Omod) const;
bool SelectVOP3Mods0Clamp0OMod(SDValue In, SDValue &Src, SDValue &SrcMods,
SDValue &Clamp,
SDValue &Omod) const;
bool SelectVOP3OMods(SDValue In, SDValue &Src,
SDValue &Clamp, SDValue &Omod) const;
bool SelectVOP3PMods(SDValue In, SDValue &Src, SDValue &SrcMods) const;
bool SelectVOP3PMods0(SDValue In, SDValue &Src, SDValue &SrcMods,
SDValue &Clamp) const;
void SelectADD_SUB_I64(SDNode *N);
void SelectUADDO_USUBO(SDNode *N);
void SelectDIV_SCALE(SDNode *N);
void SelectFMA_W_CHAIN(SDNode *N);
void SelectFMUL_W_CHAIN(SDNode *N);
SDNode *getS_BFE(unsigned Opcode, const SDLoc &DL, SDValue Val,
uint32_t Offset, uint32_t Width);
void SelectS_BFEFromShifts(SDNode *N);
void SelectS_BFE(SDNode *N);
bool isCBranchSCC(const SDNode *N) const;
void SelectBRCOND(SDNode *N);
void SelectATOMIC_CMP_SWAP(SDNode *N);
// Include the pieces autogenerated from the target description.
#include "AMDGPUGenDAGISel.inc"
};
} // end anonymous namespace
/// \brief This pass converts a legalized DAG into a AMDGPU-specific
// DAG, ready for instruction scheduling.
FunctionPass *llvm::createAMDGPUISelDag(TargetMachine &TM,
CodeGenOpt::Level OptLevel) {
return new AMDGPUDAGToDAGISel(TM, OptLevel);
}
bool AMDGPUDAGToDAGISel::runOnMachineFunction(MachineFunction &MF) {
Subtarget = &MF.getSubtarget<AMDGPUSubtarget>();
return SelectionDAGISel::runOnMachineFunction(MF);
}
bool AMDGPUDAGToDAGISel::isNoNanSrc(SDValue N) const {
if (TM.Options.NoNaNsFPMath)
return true;
// TODO: Move into isKnownNeverNaN
if (const auto *BO = dyn_cast<BinaryWithFlagsSDNode>(N))
return BO->Flags.hasNoNaNs();
return CurDAG->isKnownNeverNaN(N);
}
bool AMDGPUDAGToDAGISel::isInlineImmediate(const SDNode *N) const {
const SIInstrInfo *TII
= static_cast<const SISubtarget *>(Subtarget)->getInstrInfo();
if (const ConstantSDNode *C = dyn_cast<ConstantSDNode>(N))
return TII->isInlineConstant(C->getAPIntValue());
if (const ConstantFPSDNode *C = dyn_cast<ConstantFPSDNode>(N))
return TII->isInlineConstant(C->getValueAPF().bitcastToAPInt());
return false;
}
/// \brief Determine the register class for \p OpNo
/// \returns The register class of the virtual register that will be used for
/// the given operand number \OpNo or NULL if the register class cannot be
/// determined.
const TargetRegisterClass *AMDGPUDAGToDAGISel::getOperandRegClass(SDNode *N,
unsigned OpNo) const {
if (!N->isMachineOpcode()) {
if (N->getOpcode() == ISD::CopyToReg) {
unsigned Reg = cast<RegisterSDNode>(N->getOperand(1))->getReg();
if (TargetRegisterInfo::isVirtualRegister(Reg)) {
MachineRegisterInfo &MRI = CurDAG->getMachineFunction().getRegInfo();
return MRI.getRegClass(Reg);
}
const SIRegisterInfo *TRI
= static_cast<const SISubtarget *>(Subtarget)->getRegisterInfo();
return TRI->getPhysRegClass(Reg);
}
return nullptr;
}
switch (N->getMachineOpcode()) {
default: {
const MCInstrDesc &Desc =
Subtarget->getInstrInfo()->get(N->getMachineOpcode());
unsigned OpIdx = Desc.getNumDefs() + OpNo;
if (OpIdx >= Desc.getNumOperands())
return nullptr;
int RegClass = Desc.OpInfo[OpIdx].RegClass;
if (RegClass == -1)
return nullptr;
return Subtarget->getRegisterInfo()->getRegClass(RegClass);
}
case AMDGPU::REG_SEQUENCE: {
unsigned RCID = cast<ConstantSDNode>(N->getOperand(0))->getZExtValue();
const TargetRegisterClass *SuperRC =
Subtarget->getRegisterInfo()->getRegClass(RCID);
SDValue SubRegOp = N->getOperand(OpNo + 1);
unsigned SubRegIdx = cast<ConstantSDNode>(SubRegOp)->getZExtValue();
return Subtarget->getRegisterInfo()->getSubClassWithSubReg(SuperRC,
SubRegIdx);
}
}
}
SDNode *AMDGPUDAGToDAGISel::glueCopyToM0(SDNode *N) const {
if (Subtarget->getGeneration() < AMDGPUSubtarget::SOUTHERN_ISLANDS ||
cast<MemSDNode>(N)->getAddressSpace() != AMDGPUASI.LOCAL_ADDRESS)
return N;
const SITargetLowering& Lowering =
*static_cast<const SITargetLowering*>(getTargetLowering());
// Write max value to m0 before each load operation
SDValue M0 = Lowering.copyToM0(*CurDAG, CurDAG->getEntryNode(), SDLoc(N),
CurDAG->getTargetConstant(-1, SDLoc(N), MVT::i32));
SDValue Glue = M0.getValue(1);
SmallVector <SDValue, 8> Ops;
for (unsigned i = 0, e = N->getNumOperands(); i != e; ++i) {
Ops.push_back(N->getOperand(i));
}
Ops.push_back(Glue);
CurDAG->MorphNodeTo(N, N->getOpcode(), N->getVTList(), Ops);
return N;
}
static unsigned selectSGPRVectorRegClassID(unsigned NumVectorElts) {
switch (NumVectorElts) {
case 1:
return AMDGPU::SReg_32_XM0RegClassID;
case 2:
return AMDGPU::SReg_64RegClassID;
case 4:
return AMDGPU::SReg_128RegClassID;
case 8:
return AMDGPU::SReg_256RegClassID;
case 16:
return AMDGPU::SReg_512RegClassID;
}
llvm_unreachable("invalid vector size");
}
static bool getConstantValue(SDValue N, uint32_t &Out) {
if (const ConstantSDNode *C = dyn_cast<ConstantSDNode>(N)) {
Out = C->getAPIntValue().getZExtValue();
return true;
}
if (const ConstantFPSDNode *C = dyn_cast<ConstantFPSDNode>(N)) {
Out = C->getValueAPF().bitcastToAPInt().getZExtValue();
return true;
}
return false;
}
void AMDGPUDAGToDAGISel::Select(SDNode *N) {
unsigned int Opc = N->getOpcode();
if (N->isMachineOpcode()) {
N->setNodeId(-1);
return; // Already selected.
}
if (isa<AtomicSDNode>(N) ||
(Opc == AMDGPUISD::ATOMIC_INC || Opc == AMDGPUISD::ATOMIC_DEC))
N = glueCopyToM0(N);
switch (Opc) {
default: break;
// We are selecting i64 ADD here instead of custom lower it during
// DAG legalization, so we can fold some i64 ADDs used for address
// calculation into the LOAD and STORE instructions.
case ISD::ADD:
case ISD::ADDC:
case ISD::ADDE:
case ISD::SUB:
case ISD::SUBC:
case ISD::SUBE: {
if (N->getValueType(0) != MVT::i64 ||
Subtarget->getGeneration() < AMDGPUSubtarget::SOUTHERN_ISLANDS)
break;
SelectADD_SUB_I64(N);
return;
}
case ISD::UADDO:
case ISD::USUBO: {
SelectUADDO_USUBO(N);
return;
}
case AMDGPUISD::FMUL_W_CHAIN: {
SelectFMUL_W_CHAIN(N);
return;
}
case AMDGPUISD::FMA_W_CHAIN: {
SelectFMA_W_CHAIN(N);
return;
}
case ISD::SCALAR_TO_VECTOR:
case AMDGPUISD::BUILD_VERTICAL_VECTOR:
case ISD::BUILD_VECTOR: {
unsigned RegClassID;
const AMDGPURegisterInfo *TRI = Subtarget->getRegisterInfo();
EVT VT = N->getValueType(0);
unsigned NumVectorElts = VT.getVectorNumElements();
EVT EltVT = VT.getVectorElementType();
if (VT == MVT::v2i16 || VT == MVT::v2f16) {
if (Opc == ISD::BUILD_VECTOR) {
uint32_t LHSVal, RHSVal;
if (getConstantValue(N->getOperand(0), LHSVal) &&
getConstantValue(N->getOperand(1), RHSVal)) {
uint32_t K = LHSVal | (RHSVal << 16);
CurDAG->SelectNodeTo(N, AMDGPU::S_MOV_B32, VT,
CurDAG->getTargetConstant(K, SDLoc(N), MVT::i32));
return;
}
}
break;
}
assert(EltVT.bitsEq(MVT::i32));
if (Subtarget->getGeneration() >= AMDGPUSubtarget::SOUTHERN_ISLANDS) {
RegClassID = selectSGPRVectorRegClassID(NumVectorElts);
} else {
// BUILD_VECTOR was lowered into an IMPLICIT_DEF + 4 INSERT_SUBREG
// that adds a 128 bits reg copy when going through TwoAddressInstructions
// pass. We want to avoid 128 bits copies as much as possible because they
// can't be bundled by our scheduler.
switch(NumVectorElts) {
case 2: RegClassID = AMDGPU::R600_Reg64RegClassID; break;
case 4:
if (Opc == AMDGPUISD::BUILD_VERTICAL_VECTOR)
RegClassID = AMDGPU::R600_Reg128VerticalRegClassID;
else
RegClassID = AMDGPU::R600_Reg128RegClassID;
break;
default: llvm_unreachable("Do not know how to lower this BUILD_VECTOR");
}
}
SDLoc DL(N);
SDValue RegClass = CurDAG->getTargetConstant(RegClassID, DL, MVT::i32);
if (NumVectorElts == 1) {
CurDAG->SelectNodeTo(N, AMDGPU::COPY_TO_REGCLASS, EltVT, N->getOperand(0),
RegClass);
return;
}
assert(NumVectorElts <= 16 && "Vectors with more than 16 elements not "
"supported yet");
// 16 = Max Num Vector Elements
// 2 = 2 REG_SEQUENCE operands per element (value, subreg index)
// 1 = Vector Register Class
SmallVector<SDValue, 16 * 2 + 1> RegSeqArgs(NumVectorElts * 2 + 1);
RegSeqArgs[0] = CurDAG->getTargetConstant(RegClassID, DL, MVT::i32);
bool IsRegSeq = true;
unsigned NOps = N->getNumOperands();
for (unsigned i = 0; i < NOps; i++) {
// XXX: Why is this here?
if (isa<RegisterSDNode>(N->getOperand(i))) {
IsRegSeq = false;
break;
}
RegSeqArgs[1 + (2 * i)] = N->getOperand(i);
RegSeqArgs[1 + (2 * i) + 1] =
CurDAG->getTargetConstant(TRI->getSubRegFromChannel(i), DL,
MVT::i32);
}
if (NOps != NumVectorElts) {
// Fill in the missing undef elements if this was a scalar_to_vector.
assert(Opc == ISD::SCALAR_TO_VECTOR && NOps < NumVectorElts);
MachineSDNode *ImpDef = CurDAG->getMachineNode(TargetOpcode::IMPLICIT_DEF,
DL, EltVT);
for (unsigned i = NOps; i < NumVectorElts; ++i) {
RegSeqArgs[1 + (2 * i)] = SDValue(ImpDef, 0);
RegSeqArgs[1 + (2 * i) + 1] =
CurDAG->getTargetConstant(TRI->getSubRegFromChannel(i), DL, MVT::i32);
}
}
if (!IsRegSeq)
break;
CurDAG->SelectNodeTo(N, AMDGPU::REG_SEQUENCE, N->getVTList(), RegSeqArgs);
return;
}
case ISD::BUILD_PAIR: {
SDValue RC, SubReg0, SubReg1;
if (Subtarget->getGeneration() <= AMDGPUSubtarget::NORTHERN_ISLANDS) {
break;
}
SDLoc DL(N);
if (N->getValueType(0) == MVT::i128) {
RC = CurDAG->getTargetConstant(AMDGPU::SReg_128RegClassID, DL, MVT::i32);
SubReg0 = CurDAG->getTargetConstant(AMDGPU::sub0_sub1, DL, MVT::i32);
SubReg1 = CurDAG->getTargetConstant(AMDGPU::sub2_sub3, DL, MVT::i32);
} else if (N->getValueType(0) == MVT::i64) {
RC = CurDAG->getTargetConstant(AMDGPU::SReg_64RegClassID, DL, MVT::i32);
SubReg0 = CurDAG->getTargetConstant(AMDGPU::sub0, DL, MVT::i32);
SubReg1 = CurDAG->getTargetConstant(AMDGPU::sub1, DL, MVT::i32);
} else {
llvm_unreachable("Unhandled value type for BUILD_PAIR");
}
const SDValue Ops[] = { RC, N->getOperand(0), SubReg0,
N->getOperand(1), SubReg1 };
ReplaceNode(N, CurDAG->getMachineNode(TargetOpcode::REG_SEQUENCE, DL,
N->getValueType(0), Ops));
return;
}
case ISD::Constant:
case ISD::ConstantFP: {
if (Subtarget->getGeneration() < AMDGPUSubtarget::SOUTHERN_ISLANDS ||
N->getValueType(0).getSizeInBits() != 64 || isInlineImmediate(N))
break;
uint64_t Imm;
if (ConstantFPSDNode *FP = dyn_cast<ConstantFPSDNode>(N))
Imm = FP->getValueAPF().bitcastToAPInt().getZExtValue();
else {
ConstantSDNode *C = cast<ConstantSDNode>(N);
Imm = C->getZExtValue();
}
SDLoc DL(N);
SDNode *Lo = CurDAG->getMachineNode(AMDGPU::S_MOV_B32, DL, MVT::i32,
CurDAG->getConstant(Imm & 0xFFFFFFFF, DL,
MVT::i32));
SDNode *Hi = CurDAG->getMachineNode(AMDGPU::S_MOV_B32, DL, MVT::i32,
CurDAG->getConstant(Imm >> 32, DL, MVT::i32));
const SDValue Ops[] = {
CurDAG->getTargetConstant(AMDGPU::SReg_64RegClassID, DL, MVT::i32),
SDValue(Lo, 0), CurDAG->getTargetConstant(AMDGPU::sub0, DL, MVT::i32),
SDValue(Hi, 0), CurDAG->getTargetConstant(AMDGPU::sub1, DL, MVT::i32)
};
ReplaceNode(N, CurDAG->getMachineNode(TargetOpcode::REG_SEQUENCE, DL,
N->getValueType(0), Ops));
return;
}
case ISD::LOAD:
case ISD::STORE: {
N = glueCopyToM0(N);
break;
}
case AMDGPUISD::BFE_I32:
case AMDGPUISD::BFE_U32: {
if (Subtarget->getGeneration() < AMDGPUSubtarget::SOUTHERN_ISLANDS)
break;
// There is a scalar version available, but unlike the vector version which
// has a separate operand for the offset and width, the scalar version packs
// the width and offset into a single operand. Try to move to the scalar
// version if the offsets are constant, so that we can try to keep extended
// loads of kernel arguments in SGPRs.
// TODO: Technically we could try to pattern match scalar bitshifts of
// dynamic values, but it's probably not useful.
ConstantSDNode *Offset = dyn_cast<ConstantSDNode>(N->getOperand(1));
if (!Offset)
break;
ConstantSDNode *Width = dyn_cast<ConstantSDNode>(N->getOperand(2));
if (!Width)
break;
bool Signed = Opc == AMDGPUISD::BFE_I32;
uint32_t OffsetVal = Offset->getZExtValue();
uint32_t WidthVal = Width->getZExtValue();
ReplaceNode(N, getS_BFE(Signed ? AMDGPU::S_BFE_I32 : AMDGPU::S_BFE_U32,
SDLoc(N), N->getOperand(0), OffsetVal, WidthVal));
return;
}
case AMDGPUISD::DIV_SCALE: {
SelectDIV_SCALE(N);
return;
}
case ISD::CopyToReg: {
const SITargetLowering& Lowering =
*static_cast<const SITargetLowering*>(getTargetLowering());
Lowering.legalizeTargetIndependentNode(N, *CurDAG);
break;
}
case ISD::AND:
case ISD::SRL:
case ISD::SRA:
case ISD::SIGN_EXTEND_INREG:
if (N->getValueType(0) != MVT::i32 ||
Subtarget->getGeneration() < AMDGPUSubtarget::SOUTHERN_ISLANDS)
break;
SelectS_BFE(N);
return;
case ISD::BRCOND:
SelectBRCOND(N);
return;
case AMDGPUISD::ATOMIC_CMP_SWAP:
SelectATOMIC_CMP_SWAP(N);
return;
}
SelectCode(N);
}
bool AMDGPUDAGToDAGISel::isConstantLoad(const MemSDNode *N, int CbId) const {
if (!N->readMem())
return false;
if (CbId == -1)
return N->getAddressSpace() == AMDGPUASI.CONSTANT_ADDRESS;
return N->getAddressSpace() == AMDGPUASI.CONSTANT_BUFFER_0 + CbId;
}
bool AMDGPUDAGToDAGISel::isUniformBr(const SDNode *N) const {
const BasicBlock *BB = FuncInfo->MBB->getBasicBlock();
const Instruction *Term = BB->getTerminator();
return Term->getMetadata("amdgpu.uniform") ||
Term->getMetadata("structurizecfg.uniform");
}
StringRef AMDGPUDAGToDAGISel::getPassName() const {
return "AMDGPU DAG->DAG Pattern Instruction Selection";
}
//===----------------------------------------------------------------------===//
// Complex Patterns
//===----------------------------------------------------------------------===//
bool AMDGPUDAGToDAGISel::SelectGlobalValueConstantOffset(SDValue Addr,
SDValue& IntPtr) {
if (ConstantSDNode *Cst = dyn_cast<ConstantSDNode>(Addr)) {
IntPtr = CurDAG->getIntPtrConstant(Cst->getZExtValue() / 4, SDLoc(Addr),
true);
return true;
}
return false;
}
bool AMDGPUDAGToDAGISel::SelectGlobalValueVariableOffset(SDValue Addr,
SDValue& BaseReg, SDValue &Offset) {
if (!isa<ConstantSDNode>(Addr)) {
BaseReg = Addr;
Offset = CurDAG->getIntPtrConstant(0, SDLoc(Addr), true);
return true;
}
return false;
}
bool AMDGPUDAGToDAGISel::SelectADDRVTX_READ(SDValue Addr, SDValue &Base,
SDValue &Offset) {
ConstantSDNode *IMMOffset;
if (Addr.getOpcode() == ISD::ADD
&& (IMMOffset = dyn_cast<ConstantSDNode>(Addr.getOperand(1)))
&& isInt<16>(IMMOffset->getZExtValue())) {
Base = Addr.getOperand(0);
Offset = CurDAG->getTargetConstant(IMMOffset->getZExtValue(), SDLoc(Addr),
MVT::i32);
return true;
// If the pointer address is constant, we can move it to the offset field.
} else if ((IMMOffset = dyn_cast<ConstantSDNode>(Addr))
&& isInt<16>(IMMOffset->getZExtValue())) {
Base = CurDAG->getCopyFromReg(CurDAG->getEntryNode(),
SDLoc(CurDAG->getEntryNode()),
AMDGPU::ZERO, MVT::i32);
Offset = CurDAG->getTargetConstant(IMMOffset->getZExtValue(), SDLoc(Addr),
MVT::i32);
return true;
}
// Default case, no offset
Base = Addr;
Offset = CurDAG->getTargetConstant(0, SDLoc(Addr), MVT::i32);
return true;
}
bool AMDGPUDAGToDAGISel::SelectADDRIndirect(SDValue Addr, SDValue &Base,
SDValue &Offset) {
ConstantSDNode *C;
SDLoc DL(Addr);
if ((C = dyn_cast<ConstantSDNode>(Addr))) {
Base = CurDAG->getRegister(AMDGPU::INDIRECT_BASE_ADDR, MVT::i32);
Offset = CurDAG->getTargetConstant(C->getZExtValue(), DL, MVT::i32);
} else if ((Addr.getOpcode() == AMDGPUISD::DWORDADDR) &&
(C = dyn_cast<ConstantSDNode>(Addr.getOperand(0)))) {
Base = CurDAG->getRegister(AMDGPU::INDIRECT_BASE_ADDR, MVT::i32);
Offset = CurDAG->getTargetConstant(C->getZExtValue(), DL, MVT::i32);
} else if ((Addr.getOpcode() == ISD::ADD || Addr.getOpcode() == ISD::OR) &&
(C = dyn_cast<ConstantSDNode>(Addr.getOperand(1)))) {
Base = Addr.getOperand(0);
Offset = CurDAG->getTargetConstant(C->getZExtValue(), DL, MVT::i32);
} else {
Base = Addr;
Offset = CurDAG->getTargetConstant(0, DL, MVT::i32);
}
return true;
}
void AMDGPUDAGToDAGISel::SelectADD_SUB_I64(SDNode *N) {
SDLoc DL(N);
SDValue LHS = N->getOperand(0);
SDValue RHS = N->getOperand(1);
unsigned Opcode = N->getOpcode();
bool ConsumeCarry = (Opcode == ISD::ADDE || Opcode == ISD::SUBE);
bool ProduceCarry =
ConsumeCarry || Opcode == ISD::ADDC || Opcode == ISD::SUBC;
bool IsAdd =
(Opcode == ISD::ADD || Opcode == ISD::ADDC || Opcode == ISD::ADDE);
SDValue Sub0 = CurDAG->getTargetConstant(AMDGPU::sub0, DL, MVT::i32);
SDValue Sub1 = CurDAG->getTargetConstant(AMDGPU::sub1, DL, MVT::i32);
SDNode *Lo0 = CurDAG->getMachineNode(TargetOpcode::EXTRACT_SUBREG,
DL, MVT::i32, LHS, Sub0);
SDNode *Hi0 = CurDAG->getMachineNode(TargetOpcode::EXTRACT_SUBREG,
DL, MVT::i32, LHS, Sub1);
SDNode *Lo1 = CurDAG->getMachineNode(TargetOpcode::EXTRACT_SUBREG,
DL, MVT::i32, RHS, Sub0);
SDNode *Hi1 = CurDAG->getMachineNode(TargetOpcode::EXTRACT_SUBREG,
DL, MVT::i32, RHS, Sub1);
SDVTList VTList = CurDAG->getVTList(MVT::i32, MVT::Glue);
unsigned Opc = IsAdd ? AMDGPU::S_ADD_U32 : AMDGPU::S_SUB_U32;
unsigned CarryOpc = IsAdd ? AMDGPU::S_ADDC_U32 : AMDGPU::S_SUBB_U32;
SDNode *AddLo;
if (!ConsumeCarry) {
SDValue Args[] = { SDValue(Lo0, 0), SDValue(Lo1, 0) };
AddLo = CurDAG->getMachineNode(Opc, DL, VTList, Args);
} else {
SDValue Args[] = { SDValue(Lo0, 0), SDValue(Lo1, 0), N->getOperand(2) };
AddLo = CurDAG->getMachineNode(CarryOpc, DL, VTList, Args);
}
SDValue AddHiArgs[] = {
SDValue(Hi0, 0),
SDValue(Hi1, 0),
SDValue(AddLo, 1)
};
SDNode *AddHi = CurDAG->getMachineNode(CarryOpc, DL, VTList, AddHiArgs);
SDValue RegSequenceArgs[] = {
CurDAG->getTargetConstant(AMDGPU::SReg_64RegClassID, DL, MVT::i32),
SDValue(AddLo,0),
Sub0,
SDValue(AddHi,0),
Sub1,
};
SDNode *RegSequence = CurDAG->getMachineNode(AMDGPU::REG_SEQUENCE, DL,
MVT::i64, RegSequenceArgs);
if (ProduceCarry) {
// Replace the carry-use
CurDAG->ReplaceAllUsesOfValueWith(SDValue(N, 1), SDValue(AddHi, 1));
}
// Replace the remaining uses.
CurDAG->ReplaceAllUsesWith(N, RegSequence);
CurDAG->RemoveDeadNode(N);
}
void AMDGPUDAGToDAGISel::SelectUADDO_USUBO(SDNode *N) {
// The name of the opcodes are misleading. v_add_i32/v_sub_i32 have unsigned
// carry out despite the _i32 name. These were renamed in VI to _U32.
// FIXME: We should probably rename the opcodes here.
unsigned Opc = N->getOpcode() == ISD::UADDO ?
AMDGPU::V_ADD_I32_e64 : AMDGPU::V_SUB_I32_e64;
CurDAG->SelectNodeTo(N, Opc, N->getVTList(),
{ N->getOperand(0), N->getOperand(1) });
}
void AMDGPUDAGToDAGISel::SelectFMA_W_CHAIN(SDNode *N) {
SDLoc SL(N);
// src0_modifiers, src0, src1_modifiers, src1, src2_modifiers, src2, clamp, omod
SDValue Ops[10];
SelectVOP3Mods0(N->getOperand(1), Ops[1], Ops[0], Ops[6], Ops[7]);
SelectVOP3Mods(N->getOperand(2), Ops[3], Ops[2]);
SelectVOP3Mods(N->getOperand(3), Ops[5], Ops[4]);
Ops[8] = N->getOperand(0);
Ops[9] = N->getOperand(4);
CurDAG->SelectNodeTo(N, AMDGPU::V_FMA_F32, N->getVTList(), Ops);
}
void AMDGPUDAGToDAGISel::SelectFMUL_W_CHAIN(SDNode *N) {
SDLoc SL(N);
// src0_modifiers, src0, src1_modifiers, src1, clamp, omod
SDValue Ops[8];
SelectVOP3Mods0(N->getOperand(1), Ops[1], Ops[0], Ops[4], Ops[5]);
SelectVOP3Mods(N->getOperand(2), Ops[3], Ops[2]);
Ops[6] = N->getOperand(0);
Ops[7] = N->getOperand(3);
CurDAG->SelectNodeTo(N, AMDGPU::V_MUL_F32_e64, N->getVTList(), Ops);
}
// We need to handle this here because tablegen doesn't support matching
// instructions with multiple outputs.
void AMDGPUDAGToDAGISel::SelectDIV_SCALE(SDNode *N) {
SDLoc SL(N);
EVT VT = N->getValueType(0);
assert(VT == MVT::f32 || VT == MVT::f64);
unsigned Opc
= (VT == MVT::f64) ? AMDGPU::V_DIV_SCALE_F64 : AMDGPU::V_DIV_SCALE_F32;
SDValue Ops[] = { N->getOperand(0), N->getOperand(1), N->getOperand(2) };
CurDAG->SelectNodeTo(N, Opc, N->getVTList(), Ops);
}
bool AMDGPUDAGToDAGISel::isDSOffsetLegal(const SDValue &Base, unsigned Offset,
unsigned OffsetBits) const {
if ((OffsetBits == 16 && !isUInt<16>(Offset)) ||
(OffsetBits == 8 && !isUInt<8>(Offset)))
return false;
if (Subtarget->getGeneration() >= AMDGPUSubtarget::SEA_ISLANDS ||
Subtarget->unsafeDSOffsetFoldingEnabled())
return true;
// On Southern Islands instruction with a negative base value and an offset
// don't seem to work.
return CurDAG->SignBitIsZero(Base);
}
bool AMDGPUDAGToDAGISel::SelectDS1Addr1Offset(SDValue Addr, SDValue &Base,
SDValue &Offset) const {
SDLoc DL(Addr);
if (CurDAG->isBaseWithConstantOffset(Addr)) {
SDValue N0 = Addr.getOperand(0);
SDValue N1 = Addr.getOperand(1);
ConstantSDNode *C1 = cast<ConstantSDNode>(N1);
if (isDSOffsetLegal(N0, C1->getSExtValue(), 16)) {
// (add n0, c0)
Base = N0;
Offset = CurDAG->getTargetConstant(C1->getZExtValue(), DL, MVT::i16);
return true;
}
} else if (Addr.getOpcode() == ISD::SUB) {
// sub C, x -> add (sub 0, x), C
if (const ConstantSDNode *C = dyn_cast<ConstantSDNode>(Addr.getOperand(0))) {
int64_t ByteOffset = C->getSExtValue();
if (isUInt<16>(ByteOffset)) {
SDValue Zero = CurDAG->getTargetConstant(0, DL, MVT::i32);
// XXX - This is kind of hacky. Create a dummy sub node so we can check
// the known bits in isDSOffsetLegal. We need to emit the selected node
// here, so this is thrown away.
SDValue Sub = CurDAG->getNode(ISD::SUB, DL, MVT::i32,
Zero, Addr.getOperand(1));
if (isDSOffsetLegal(Sub, ByteOffset, 16)) {
MachineSDNode *MachineSub
= CurDAG->getMachineNode(AMDGPU::V_SUB_I32_e32, DL, MVT::i32,
Zero, Addr.getOperand(1));
Base = SDValue(MachineSub, 0);
Offset = CurDAG->getTargetConstant(ByteOffset, DL, MVT::i16);
return true;
}
}
}
} else if (const ConstantSDNode *CAddr = dyn_cast<ConstantSDNode>(Addr)) {
// If we have a constant address, prefer to put the constant into the
// offset. This can save moves to load the constant address since multiple
// operations can share the zero base address register, and enables merging
// into read2 / write2 instructions.
SDLoc DL(Addr);
if (isUInt<16>(CAddr->getZExtValue())) {
SDValue Zero = CurDAG->getTargetConstant(0, DL, MVT::i32);
MachineSDNode *MovZero = CurDAG->getMachineNode(AMDGPU::V_MOV_B32_e32,
DL, MVT::i32, Zero);
Base = SDValue(MovZero, 0);
Offset = CurDAG->getTargetConstant(CAddr->getZExtValue(), DL, MVT::i16);
return true;
}
}
// default case
Base = Addr;
Offset = CurDAG->getTargetConstant(0, SDLoc(Addr), MVT::i16);
return true;
}
// TODO: If offset is too big, put low 16-bit into offset.
bool AMDGPUDAGToDAGISel::SelectDS64Bit4ByteAligned(SDValue Addr, SDValue &Base,
SDValue &Offset0,
SDValue &Offset1) const {
SDLoc DL(Addr);
if (CurDAG->isBaseWithConstantOffset(Addr)) {
SDValue N0 = Addr.getOperand(0);
SDValue N1 = Addr.getOperand(1);
ConstantSDNode *C1 = cast<ConstantSDNode>(N1);
unsigned DWordOffset0 = C1->getZExtValue() / 4;
unsigned DWordOffset1 = DWordOffset0 + 1;
// (add n0, c0)
if (isDSOffsetLegal(N0, DWordOffset1, 8)) {
Base = N0;
Offset0 = CurDAG->getTargetConstant(DWordOffset0, DL, MVT::i8);
Offset1 = CurDAG->getTargetConstant(DWordOffset1, DL, MVT::i8);
return true;
}
} else if (Addr.getOpcode() == ISD::SUB) {
// sub C, x -> add (sub 0, x), C
if (const ConstantSDNode *C = dyn_cast<ConstantSDNode>(Addr.getOperand(0))) {
unsigned DWordOffset0 = C->getZExtValue() / 4;
unsigned DWordOffset1 = DWordOffset0 + 1;
if (isUInt<8>(DWordOffset0)) {
SDLoc DL(Addr);
SDValue Zero = CurDAG->getTargetConstant(0, DL, MVT::i32);
// XXX - This is kind of hacky. Create a dummy sub node so we can check
// the known bits in isDSOffsetLegal. We need to emit the selected node
// here, so this is thrown away.
SDValue Sub = CurDAG->getNode(ISD::SUB, DL, MVT::i32,
Zero, Addr.getOperand(1));
if (isDSOffsetLegal(Sub, DWordOffset1, 8)) {
MachineSDNode *MachineSub
= CurDAG->getMachineNode(AMDGPU::V_SUB_I32_e32, DL, MVT::i32,
Zero, Addr.getOperand(1));
Base = SDValue(MachineSub, 0);
Offset0 = CurDAG->getTargetConstant(DWordOffset0, DL, MVT::i8);
Offset1 = CurDAG->getTargetConstant(DWordOffset1, DL, MVT::i8);
return true;
}
}
}
} else if (const ConstantSDNode *CAddr = dyn_cast<ConstantSDNode>(Addr)) {
unsigned DWordOffset0 = CAddr->getZExtValue() / 4;
unsigned DWordOffset1 = DWordOffset0 + 1;
assert(4 * DWordOffset0 == CAddr->getZExtValue());
if (isUInt<8>(DWordOffset0) && isUInt<8>(DWordOffset1)) {
SDValue Zero = CurDAG->getTargetConstant(0, DL, MVT::i32);
MachineSDNode *MovZero
= CurDAG->getMachineNode(AMDGPU::V_MOV_B32_e32,
DL, MVT::i32, Zero);
Base = SDValue(MovZero, 0);
Offset0 = CurDAG->getTargetConstant(DWordOffset0, DL, MVT::i8);
Offset1 = CurDAG->getTargetConstant(DWordOffset1, DL, MVT::i8);
return true;
}
}
// default case
// FIXME: This is broken on SI where we still need to check if the base
// pointer is positive here.
Base = Addr;
Offset0 = CurDAG->getTargetConstant(0, DL, MVT::i8);
Offset1 = CurDAG->getTargetConstant(1, DL, MVT::i8);
return true;
}
static bool isLegalMUBUFImmOffset(const ConstantSDNode *Imm) {
return isUInt<12>(Imm->getZExtValue());
}
bool AMDGPUDAGToDAGISel::SelectMUBUF(SDValue Addr, SDValue &Ptr,
SDValue &VAddr, SDValue &SOffset,
SDValue &Offset, SDValue &Offen,
SDValue &Idxen, SDValue &Addr64,
SDValue &GLC, SDValue &SLC,
SDValue &TFE) const {
// Subtarget prefers to use flat instruction
if (Subtarget->useFlatForGlobal())
return false;
SDLoc DL(Addr);
if (!GLC.getNode())
GLC = CurDAG->getTargetConstant(0, DL, MVT::i1);
if (!SLC.getNode())
SLC = CurDAG->getTargetConstant(0, DL, MVT::i1);
TFE = CurDAG->getTargetConstant(0, DL, MVT::i1);
Idxen = CurDAG->getTargetConstant(0, DL, MVT::i1);
Offen = CurDAG->getTargetConstant(0, DL, MVT::i1);
Addr64 = CurDAG->getTargetConstant(0, DL, MVT::i1);
SOffset = CurDAG->getTargetConstant(0, DL, MVT::i32);
if (CurDAG->isBaseWithConstantOffset(Addr)) {
SDValue N0 = Addr.getOperand(0);
SDValue N1 = Addr.getOperand(1);
ConstantSDNode *C1 = cast<ConstantSDNode>(N1);
if (N0.getOpcode() == ISD::ADD) {
// (add (add N2, N3), C1) -> addr64
SDValue N2 = N0.getOperand(0);
SDValue N3 = N0.getOperand(1);
Addr64 = CurDAG->getTargetConstant(1, DL, MVT::i1);
Ptr = N2;
VAddr = N3;
} else {
// (add N0, C1) -> offset
VAddr = CurDAG->getTargetConstant(0, DL, MVT::i32);
Ptr = N0;
}
if (isLegalMUBUFImmOffset(C1)) {
Offset = CurDAG->getTargetConstant(C1->getZExtValue(), DL, MVT::i16);
return true;
}
if (isUInt<32>(C1->getZExtValue())) {
// Illegal offset, store it in soffset.
Offset = CurDAG->getTargetConstant(0, DL, MVT::i16);
SOffset = SDValue(CurDAG->getMachineNode(AMDGPU::S_MOV_B32, DL, MVT::i32,
CurDAG->getTargetConstant(C1->getZExtValue(), DL, MVT::i32)),
0);
return true;
}
}
if (Addr.getOpcode() == ISD::ADD) {
// (add N0, N1) -> addr64
SDValue N0 = Addr.getOperand(0);
SDValue N1 = Addr.getOperand(1);
Addr64 = CurDAG->getTargetConstant(1, DL, MVT::i1);
Ptr = N0;
VAddr = N1;
Offset = CurDAG->getTargetConstant(0, DL, MVT::i16);
return true;
}
// default case -> offset
VAddr = CurDAG->getTargetConstant(0, DL, MVT::i32);
Ptr = Addr;
Offset = CurDAG->getTargetConstant(0, DL, MVT::i16);
return true;
}
bool AMDGPUDAGToDAGISel::SelectMUBUFAddr64(SDValue Addr, SDValue &SRsrc,
SDValue &VAddr, SDValue &SOffset,
SDValue &Offset, SDValue &GLC,
SDValue &SLC, SDValue &TFE) const {
SDValue Ptr, Offen, Idxen, Addr64;
// addr64 bit was removed for volcanic islands.
if (Subtarget->getGeneration() >= AMDGPUSubtarget::VOLCANIC_ISLANDS)
return false;
if (!SelectMUBUF(Addr, Ptr, VAddr, SOffset, Offset, Offen, Idxen, Addr64,
GLC, SLC, TFE))
return false;
ConstantSDNode *C = cast<ConstantSDNode>(Addr64);
if (C->getSExtValue()) {
SDLoc DL(Addr);
const SITargetLowering& Lowering =
*static_cast<const SITargetLowering*>(getTargetLowering());
SRsrc = SDValue(Lowering.wrapAddr64Rsrc(*CurDAG, DL, Ptr), 0);
return true;
}
return false;
}
bool AMDGPUDAGToDAGISel::SelectMUBUFAddr64(SDValue Addr, SDValue &SRsrc,
SDValue &VAddr, SDValue &SOffset,
SDValue &Offset,
SDValue &SLC) const {
SLC = CurDAG->getTargetConstant(0, SDLoc(Addr), MVT::i1);
SDValue GLC, TFE;
return SelectMUBUFAddr64(Addr, SRsrc, VAddr, SOffset, Offset, GLC, SLC, TFE);
}
SDValue AMDGPUDAGToDAGISel::foldFrameIndex(SDValue N) const {
if (auto FI = dyn_cast<FrameIndexSDNode>(N))
return CurDAG->getTargetFrameIndex(FI->getIndex(), FI->getValueType(0));
return N;
}
bool AMDGPUDAGToDAGISel::SelectMUBUFScratch(SDValue Addr, SDValue &Rsrc,
SDValue &VAddr, SDValue &SOffset,
SDValue &ImmOffset) const {
SDLoc DL(Addr);
MachineFunction &MF = CurDAG->getMachineFunction();
const SIMachineFunctionInfo *Info = MF.getInfo<SIMachineFunctionInfo>();
Rsrc = CurDAG->getRegister(Info->getScratchRSrcReg(), MVT::v4i32);
SOffset = CurDAG->getRegister(Info->getScratchWaveOffsetReg(), MVT::i32);
// (add n0, c1)
if (CurDAG->isBaseWithConstantOffset(Addr)) {
SDValue N0 = Addr.getOperand(0);
SDValue N1 = Addr.getOperand(1);
// Offsets in vaddr must be positive.
ConstantSDNode *C1 = cast<ConstantSDNode>(N1);
if (isLegalMUBUFImmOffset(C1)) {
VAddr = foldFrameIndex(N0);
ImmOffset = CurDAG->getTargetConstant(C1->getZExtValue(), DL, MVT::i16);
return true;
}
}
// (node)
VAddr = foldFrameIndex(Addr);
ImmOffset = CurDAG->getTargetConstant(0, DL, MVT::i16);
return true;
}
bool AMDGPUDAGToDAGISel::SelectMUBUFOffset(SDValue Addr, SDValue &SRsrc,
SDValue &SOffset, SDValue &Offset,
SDValue &GLC, SDValue &SLC,
SDValue &TFE) const {
SDValue Ptr, VAddr, Offen, Idxen, Addr64;
const SIInstrInfo *TII =
static_cast<const SIInstrInfo *>(Subtarget->getInstrInfo());
if (!SelectMUBUF(Addr, Ptr, VAddr, SOffset, Offset, Offen, Idxen, Addr64,
GLC, SLC, TFE))
return false;
if (!cast<ConstantSDNode>(Offen)->getSExtValue() &&
!cast<ConstantSDNode>(Idxen)->getSExtValue() &&
!cast<ConstantSDNode>(Addr64)->getSExtValue()) {
uint64_t Rsrc = TII->getDefaultRsrcDataFormat() |
APInt::getAllOnesValue(32).getZExtValue(); // Size
SDLoc DL(Addr);
const SITargetLowering& Lowering =
*static_cast<const SITargetLowering*>(getTargetLowering());
SRsrc = SDValue(Lowering.buildRSRC(*CurDAG, DL, Ptr, 0, Rsrc), 0);
return true;
}
return false;
}
bool AMDGPUDAGToDAGISel::SelectMUBUFOffset(SDValue Addr, SDValue &SRsrc,
SDValue &Soffset, SDValue &Offset
) const {
SDValue GLC, SLC, TFE;
return SelectMUBUFOffset(Addr, SRsrc, Soffset, Offset, GLC, SLC, TFE);
}
bool AMDGPUDAGToDAGISel::SelectMUBUFOffset(SDValue Addr, SDValue &SRsrc,
SDValue &Soffset, SDValue &Offset,
SDValue &SLC) const {
SDValue GLC, TFE;
return SelectMUBUFOffset(Addr, SRsrc, Soffset, Offset, GLC, SLC, TFE);
}
bool AMDGPUDAGToDAGISel::SelectMUBUFConstant(SDValue Constant,
SDValue &SOffset,
SDValue &ImmOffset) const {
SDLoc DL(Constant);
uint32_t Imm = cast<ConstantSDNode>(Constant)->getZExtValue();
uint32_t Overflow = 0;
if (Imm >= 4096) {
if (Imm <= 4095 + 64) {
// Use an SOffset inline constant for 1..64
Overflow = Imm - 4095;
Imm = 4095;
} else {
// Try to keep the same value in SOffset for adjacent loads, so that
// the corresponding register contents can be re-used.
//
// Load values with all low-bits set into SOffset, so that a larger
// range of values can be covered using s_movk_i32
uint32_t High = (Imm + 1) & ~4095;
uint32_t Low = (Imm + 1) & 4095;
Imm = Low;
Overflow = High - 1;
}
}
// There is a hardware bug in SI and CI which prevents address clamping in
// MUBUF instructions from working correctly with SOffsets. The immediate
// offset is unaffected.
if (Overflow > 0 &&
Subtarget->getGeneration() <= AMDGPUSubtarget::SEA_ISLANDS)
return false;
ImmOffset = CurDAG->getTargetConstant(Imm, DL, MVT::i16);
if (Overflow <= 64)
SOffset = CurDAG->getTargetConstant(Overflow, DL, MVT::i32);
else
SOffset = SDValue(CurDAG->getMachineNode(AMDGPU::S_MOV_B32, DL, MVT::i32,
CurDAG->getTargetConstant(Overflow, DL, MVT::i32)),
0);
return true;
}
bool AMDGPUDAGToDAGISel::SelectMUBUFIntrinsicOffset(SDValue Offset,
SDValue &SOffset,
SDValue &ImmOffset) const {
SDLoc DL(Offset);
if (!isa<ConstantSDNode>(Offset))
return false;
return SelectMUBUFConstant(Offset, SOffset, ImmOffset);
}
bool AMDGPUDAGToDAGISel::SelectMUBUFIntrinsicVOffset(SDValue Offset,
SDValue &SOffset,
SDValue &ImmOffset,
SDValue &VOffset) const {
SDLoc DL(Offset);
// Don't generate an unnecessary voffset for constant offsets.
if (isa<ConstantSDNode>(Offset)) {
SDValue Tmp1, Tmp2;
// When necessary, use a voffset in <= CI anyway to work around a hardware
// bug.
if (Subtarget->getGeneration() > AMDGPUSubtarget::SEA_ISLANDS ||
SelectMUBUFConstant(Offset, Tmp1, Tmp2))
return false;
}
if (CurDAG->isBaseWithConstantOffset(Offset)) {
SDValue N0 = Offset.getOperand(0);
SDValue N1 = Offset.getOperand(1);
if (cast<ConstantSDNode>(N1)->getSExtValue() >= 0 &&
SelectMUBUFConstant(N1, SOffset, ImmOffset)) {
VOffset = N0;
return true;
}
}
SOffset = CurDAG->getTargetConstant(0, DL, MVT::i32);
ImmOffset = CurDAG->getTargetConstant(0, DL, MVT::i16);
VOffset = Offset;
return true;
}
bool AMDGPUDAGToDAGISel::SelectFlat(SDValue Addr,
SDValue &VAddr,
SDValue &SLC,
SDValue &TFE) const {
VAddr = Addr;
TFE = SLC = CurDAG->getTargetConstant(0, SDLoc(), MVT::i1);
return true;
}
bool AMDGPUDAGToDAGISel::SelectSMRDOffset(SDValue ByteOffsetNode,
SDValue &Offset, bool &Imm) const {
// FIXME: Handle non-constant offsets.
ConstantSDNode *C = dyn_cast<ConstantSDNode>(ByteOffsetNode);
if (!C)
return false;
SDLoc SL(ByteOffsetNode);
AMDGPUSubtarget::Generation Gen = Subtarget->getGeneration();
int64_t ByteOffset = C->getSExtValue();
int64_t EncodedOffset = AMDGPU::getSMRDEncodedOffset(*Subtarget, ByteOffset);
if (AMDGPU::isLegalSMRDImmOffset(*Subtarget, ByteOffset)) {
Offset = CurDAG->getTargetConstant(EncodedOffset, SL, MVT::i32);
Imm = true;
return true;
}
if (!isUInt<32>(EncodedOffset) || !isUInt<32>(ByteOffset))
return false;
if (Gen == AMDGPUSubtarget::SEA_ISLANDS && isUInt<32>(EncodedOffset)) {
// 32-bit Immediates are supported on Sea Islands.
Offset = CurDAG->getTargetConstant(EncodedOffset, SL, MVT::i32);
} else {
SDValue C32Bit = CurDAG->getTargetConstant(ByteOffset, SL, MVT::i32);
Offset = SDValue(CurDAG->getMachineNode(AMDGPU::S_MOV_B32, SL, MVT::i32,
C32Bit), 0);
}
Imm = false;
return true;
}
bool AMDGPUDAGToDAGISel::SelectSMRD(SDValue Addr, SDValue &SBase,
SDValue &Offset, bool &Imm) const {
SDLoc SL(Addr);
if (CurDAG->isBaseWithConstantOffset(Addr)) {
SDValue N0 = Addr.getOperand(0);
SDValue N1 = Addr.getOperand(1);
if (SelectSMRDOffset(N1, Offset, Imm)) {
SBase = N0;
return true;
}
}
SBase = Addr;
Offset = CurDAG->getTargetConstant(0, SL, MVT::i32);
Imm = true;
return true;
}
bool AMDGPUDAGToDAGISel::SelectSMRDImm(SDValue Addr, SDValue &SBase,
SDValue &Offset) const {
bool Imm;
return SelectSMRD(Addr, SBase, Offset, Imm) && Imm;
}
bool AMDGPUDAGToDAGISel::SelectSMRDImm32(SDValue Addr, SDValue &SBase,
SDValue &Offset) const {
if (Subtarget->getGeneration() != AMDGPUSubtarget::SEA_ISLANDS)
return false;
bool Imm;
if (!SelectSMRD(Addr, SBase, Offset, Imm))
return false;
return !Imm && isa<ConstantSDNode>(Offset);
}
bool AMDGPUDAGToDAGISel::SelectSMRDSgpr(SDValue Addr, SDValue &SBase,
SDValue &Offset) const {
bool Imm;
return SelectSMRD(Addr, SBase, Offset, Imm) && !Imm &&
!isa<ConstantSDNode>(Offset);
}
bool AMDGPUDAGToDAGISel::SelectSMRDBufferImm(SDValue Addr,
SDValue &Offset) const {
bool Imm;
return SelectSMRDOffset(Addr, Offset, Imm) && Imm;
}
bool AMDGPUDAGToDAGISel::SelectSMRDBufferImm32(SDValue Addr,
SDValue &Offset) const {
if (Subtarget->getGeneration() != AMDGPUSubtarget::SEA_ISLANDS)
return false;
bool Imm;
if (!SelectSMRDOffset(Addr, Offset, Imm))
return false;
return !Imm && isa<ConstantSDNode>(Offset);
}
bool AMDGPUDAGToDAGISel::SelectSMRDBufferSgpr(SDValue Addr,
SDValue &Offset) const {
bool Imm;
return SelectSMRDOffset(Addr, Offset, Imm) && !Imm &&
!isa<ConstantSDNode>(Offset);
}
bool AMDGPUDAGToDAGISel::SelectMOVRELOffset(SDValue Index,
SDValue &Base,
SDValue &Offset) const {
SDLoc DL(Index);
if (CurDAG->isBaseWithConstantOffset(Index)) {
SDValue N0 = Index.getOperand(0);
SDValue N1 = Index.getOperand(1);
ConstantSDNode *C1 = cast<ConstantSDNode>(N1);
// (add n0, c0)
Base = N0;
Offset = CurDAG->getTargetConstant(C1->getZExtValue(), DL, MVT::i32);
return true;
}
if (isa<ConstantSDNode>(Index))
return false;
Base = Index;
Offset = CurDAG->getTargetConstant(0, DL, MVT::i32);
return true;
}
SDNode *AMDGPUDAGToDAGISel::getS_BFE(unsigned Opcode, const SDLoc &DL,
SDValue Val, uint32_t Offset,
uint32_t Width) {
// Transformation function, pack the offset and width of a BFE into
// the format expected by the S_BFE_I32 / S_BFE_U32. In the second
// source, bits [5:0] contain the offset and bits [22:16] the width.
uint32_t PackedVal = Offset | (Width << 16);
SDValue PackedConst = CurDAG->getTargetConstant(PackedVal, DL, MVT::i32);
return CurDAG->getMachineNode(Opcode, DL, MVT::i32, Val, PackedConst);
}
void AMDGPUDAGToDAGISel::SelectS_BFEFromShifts(SDNode *N) {
// "(a << b) srl c)" ---> "BFE_U32 a, (c-b), (32-c)
// "(a << b) sra c)" ---> "BFE_I32 a, (c-b), (32-c)
// Predicate: 0 < b <= c < 32
const SDValue &Shl = N->getOperand(0);
ConstantSDNode *B = dyn_cast<ConstantSDNode>(Shl->getOperand(1));
ConstantSDNode *C = dyn_cast<ConstantSDNode>(N->getOperand(1));
if (B && C) {
uint32_t BVal = B->getZExtValue();
uint32_t CVal = C->getZExtValue();
if (0 < BVal && BVal <= CVal && CVal < 32) {
bool Signed = N->getOpcode() == ISD::SRA;
unsigned Opcode = Signed ? AMDGPU::S_BFE_I32 : AMDGPU::S_BFE_U32;
ReplaceNode(N, getS_BFE(Opcode, SDLoc(N), Shl.getOperand(0), CVal - BVal,
32 - CVal));
return;
}
}
SelectCode(N);
}
void AMDGPUDAGToDAGISel::SelectS_BFE(SDNode *N) {
switch (N->getOpcode()) {
case ISD::AND:
if (N->getOperand(0).getOpcode() == ISD::SRL) {
// "(a srl b) & mask" ---> "BFE_U32 a, b, popcount(mask)"
// Predicate: isMask(mask)
const SDValue &Srl = N->getOperand(0);
ConstantSDNode *Shift = dyn_cast<ConstantSDNode>(Srl.getOperand(1));
ConstantSDNode *Mask = dyn_cast<ConstantSDNode>(N->getOperand(1));
if (Shift && Mask) {
uint32_t ShiftVal = Shift->getZExtValue();
uint32_t MaskVal = Mask->getZExtValue();
if (isMask_32(MaskVal)) {
uint32_t WidthVal = countPopulation(MaskVal);
ReplaceNode(N, getS_BFE(AMDGPU::S_BFE_U32, SDLoc(N),
Srl.getOperand(0), ShiftVal, WidthVal));
return;
}
}
}
break;
case ISD::SRL:
if (N->getOperand(0).getOpcode() == ISD::AND) {
// "(a & mask) srl b)" ---> "BFE_U32 a, b, popcount(mask >> b)"
// Predicate: isMask(mask >> b)
const SDValue &And = N->getOperand(0);
ConstantSDNode *Shift = dyn_cast<ConstantSDNode>(N->getOperand(1));
ConstantSDNode *Mask = dyn_cast<ConstantSDNode>(And->getOperand(1));
if (Shift && Mask) {
uint32_t ShiftVal = Shift->getZExtValue();
uint32_t MaskVal = Mask->getZExtValue() >> ShiftVal;
if (isMask_32(MaskVal)) {
uint32_t WidthVal = countPopulation(MaskVal);
ReplaceNode(N, getS_BFE(AMDGPU::S_BFE_U32, SDLoc(N),
And.getOperand(0), ShiftVal, WidthVal));
return;
}
}
} else if (N->getOperand(0).getOpcode() == ISD::SHL) {
SelectS_BFEFromShifts(N);
return;
}
break;
case ISD::SRA:
if (N->getOperand(0).getOpcode() == ISD::SHL) {
SelectS_BFEFromShifts(N);
return;
}
break;
case ISD::SIGN_EXTEND_INREG: {
// sext_inreg (srl x, 16), i8 -> bfe_i32 x, 16, 8
SDValue Src = N->getOperand(0);
if (Src.getOpcode() != ISD::SRL)
break;
const ConstantSDNode *Amt = dyn_cast<ConstantSDNode>(Src.getOperand(1));
if (!Amt)
break;
unsigned Width = cast<VTSDNode>(N->getOperand(1))->getVT().getSizeInBits();
ReplaceNode(N, getS_BFE(AMDGPU::S_BFE_I32, SDLoc(N), Src.getOperand(0),
Amt->getZExtValue(), Width));
return;
}
}
SelectCode(N);
}
bool AMDGPUDAGToDAGISel::isCBranchSCC(const SDNode *N) const {
assert(N->getOpcode() == ISD::BRCOND);
if (!N->hasOneUse())
return false;
SDValue Cond = N->getOperand(1);
if (Cond.getOpcode() == ISD::CopyToReg)
Cond = Cond.getOperand(2);
if (Cond.getOpcode() != ISD::SETCC || !Cond.hasOneUse())
return false;
MVT VT = Cond.getOperand(0).getSimpleValueType();
if (VT == MVT::i32)
return true;
if (VT == MVT::i64) {
auto ST = static_cast<const SISubtarget *>(Subtarget);
ISD::CondCode CC = cast<CondCodeSDNode>(Cond.getOperand(2))->get();
return (CC == ISD::SETEQ || CC == ISD::SETNE) && ST->hasScalarCompareEq64();
}
return false;
}
void AMDGPUDAGToDAGISel::SelectBRCOND(SDNode *N) {
SDValue Cond = N->getOperand(1);
if (Cond.isUndef()) {
CurDAG->SelectNodeTo(N, AMDGPU::SI_BR_UNDEF, MVT::Other,
N->getOperand(2), N->getOperand(0));
return;
}
if (isCBranchSCC(N)) {
// This brcond will use S_CBRANCH_SCC*, so let tablegen handle it.
SelectCode(N);
return;
}
SDLoc SL(N);
SDValue VCC = CurDAG->getCopyToReg(N->getOperand(0), SL, AMDGPU::VCC, Cond);
CurDAG->SelectNodeTo(N, AMDGPU::S_CBRANCH_VCCNZ, MVT::Other,
N->getOperand(2), // Basic Block
VCC.getValue(0));
}
// This is here because there isn't a way to use the generated sub0_sub1 as the
// subreg index to EXTRACT_SUBREG in tablegen.
void AMDGPUDAGToDAGISel::SelectATOMIC_CMP_SWAP(SDNode *N) {
MemSDNode *Mem = cast<MemSDNode>(N);
unsigned AS = Mem->getAddressSpace();
if (AS == AMDGPUASI.FLAT_ADDRESS) {
SelectCode(N);
return;
}
MVT VT = N->getSimpleValueType(0);
bool Is32 = (VT == MVT::i32);
SDLoc SL(N);
MachineSDNode *CmpSwap = nullptr;
if (Subtarget->hasAddr64()) {
SDValue SRsrc, VAddr, SOffset, Offset, GLC, SLC;
if (SelectMUBUFAddr64(Mem->getBasePtr(), SRsrc, VAddr, SOffset, Offset, SLC)) {
unsigned Opcode = Is32 ? AMDGPU::BUFFER_ATOMIC_CMPSWAP_RTN_ADDR64 :
AMDGPU::BUFFER_ATOMIC_CMPSWAP_X2_RTN_ADDR64;
SDValue CmpVal = Mem->getOperand(2);
// XXX - Do we care about glue operands?
SDValue Ops[] = {
CmpVal, VAddr, SRsrc, SOffset, Offset, SLC, Mem->getChain()
};
CmpSwap = CurDAG->getMachineNode(Opcode, SL, Mem->getVTList(), Ops);
}
}
if (!CmpSwap) {
SDValue SRsrc, SOffset, Offset, SLC;
if (SelectMUBUFOffset(Mem->getBasePtr(), SRsrc, SOffset, Offset, SLC)) {
unsigned Opcode = Is32 ? AMDGPU::BUFFER_ATOMIC_CMPSWAP_RTN_OFFSET :
AMDGPU::BUFFER_ATOMIC_CMPSWAP_X2_RTN_OFFSET;
SDValue CmpVal = Mem->getOperand(2);
SDValue Ops[] = {
CmpVal, SRsrc, SOffset, Offset, SLC, Mem->getChain()
};
CmpSwap = CurDAG->getMachineNode(Opcode, SL, Mem->getVTList(), Ops);
}
}
if (!CmpSwap) {
SelectCode(N);
return;
}
MachineSDNode::mmo_iterator MMOs = MF->allocateMemRefsArray(1);
*MMOs = Mem->getMemOperand();
CmpSwap->setMemRefs(MMOs, MMOs + 1);
unsigned SubReg = Is32 ? AMDGPU::sub0 : AMDGPU::sub0_sub1;
SDValue Extract
= CurDAG->getTargetExtractSubreg(SubReg, SL, VT, SDValue(CmpSwap, 0));
ReplaceUses(SDValue(N, 0), Extract);
ReplaceUses(SDValue(N, 1), SDValue(CmpSwap, 1));
CurDAG->RemoveDeadNode(N);
}
bool AMDGPUDAGToDAGISel::SelectVOP3Mods(SDValue In, SDValue &Src,
SDValue &SrcMods) const {
unsigned Mods = 0;
Src = In;
if (Src.getOpcode() == ISD::FNEG) {
Mods |= SISrcMods::NEG;
Src = Src.getOperand(0);
}
if (Src.getOpcode() == ISD::FABS) {
Mods |= SISrcMods::ABS;
Src = Src.getOperand(0);
}
SrcMods = CurDAG->getTargetConstant(Mods, SDLoc(In), MVT::i32);
return true;
}
bool AMDGPUDAGToDAGISel::SelectVOP3Mods_NNaN(SDValue In, SDValue &Src,
SDValue &SrcMods) const {
SelectVOP3Mods(In, Src, SrcMods);
return isNoNanSrc(Src);
}
bool AMDGPUDAGToDAGISel::SelectVOP3NoMods(SDValue In, SDValue &Src,
SDValue &SrcMods) const {
bool Res = SelectVOP3Mods(In, Src, SrcMods);
return Res && cast<ConstantSDNode>(SrcMods)->isNullValue();
}
bool AMDGPUDAGToDAGISel::SelectVOP3Mods0(SDValue In, SDValue &Src,
SDValue &SrcMods, SDValue &Clamp,
SDValue &Omod) const {
SDLoc DL(In);
// FIXME: Handle Clamp and Omod
Clamp = CurDAG->getTargetConstant(0, DL, MVT::i32);
Omod = CurDAG->getTargetConstant(0, DL, MVT::i32);
return SelectVOP3Mods(In, Src, SrcMods);
}
bool AMDGPUDAGToDAGISel::SelectVOP3NoMods0(SDValue In, SDValue &Src,
SDValue &SrcMods, SDValue &Clamp,
SDValue &Omod) const {
bool Res = SelectVOP3Mods0(In, Src, SrcMods, Clamp, Omod);
return Res && cast<ConstantSDNode>(SrcMods)->isNullValue() &&
cast<ConstantSDNode>(Clamp)->isNullValue() &&
cast<ConstantSDNode>(Omod)->isNullValue();
}
bool AMDGPUDAGToDAGISel::SelectVOP3Mods0Clamp(SDValue In, SDValue &Src,
SDValue &SrcMods,
SDValue &Omod) const {
// FIXME: Handle Omod
Omod = CurDAG->getTargetConstant(0, SDLoc(In), MVT::i32);
return SelectVOP3Mods(In, Src, SrcMods);
}
bool AMDGPUDAGToDAGISel::SelectVOP3Mods0Clamp0OMod(SDValue In, SDValue &Src,
SDValue &SrcMods,
SDValue &Clamp,
SDValue &Omod) const {
Clamp = Omod = CurDAG->getTargetConstant(0, SDLoc(In), MVT::i32);
return SelectVOP3Mods(In, Src, SrcMods);
}
bool AMDGPUDAGToDAGISel::SelectVOP3OMods(SDValue In, SDValue &Src,
SDValue &Clamp, SDValue &Omod) const {
Src = In;
SDLoc DL(In);
// FIXME: Handle Clamp and Omod
Clamp = CurDAG->getTargetConstant(0, DL, MVT::i32);
Omod = CurDAG->getTargetConstant(0, DL, MVT::i32);
return true;
}
bool AMDGPUDAGToDAGISel::SelectVOP3PMods(SDValue In, SDValue &Src,
SDValue &SrcMods) const {
unsigned Mods = 0;
Src = In;
// FIXME: Look for on separate components
if (Src.getOpcode() == ISD::FNEG) {
Mods |= (SISrcMods::NEG | SISrcMods::NEG_HI);
Src = Src.getOperand(0);
}
// Packed instructions do not have abs modifiers.
// FIXME: Handle abs/neg of individual components.
// FIXME: Handle swizzling with op_sel
Mods |= SISrcMods::OP_SEL_1;
SrcMods = CurDAG->getTargetConstant(Mods, SDLoc(In), MVT::i32);
return true;
}
bool AMDGPUDAGToDAGISel::SelectVOP3PMods0(SDValue In, SDValue &Src,
SDValue &SrcMods,
SDValue &Clamp) const {
SDLoc SL(In);
// FIXME: Handle clamp and op_sel
Clamp = CurDAG->getTargetConstant(0, SL, MVT::i32);
return SelectVOP3PMods(In, Src, SrcMods);
}
void AMDGPUDAGToDAGISel::PostprocessISelDAG() {
const AMDGPUTargetLowering& Lowering =
*static_cast<const AMDGPUTargetLowering*>(getTargetLowering());
bool IsModified = false;
do {
IsModified = false;
// Go over all selected nodes and try to fold them a bit more
for (SDNode &Node : CurDAG->allnodes()) {
MachineSDNode *MachineNode = dyn_cast<MachineSDNode>(&Node);
if (!MachineNode)
continue;
SDNode *ResNode = Lowering.PostISelFolding(MachineNode, *CurDAG);
if (ResNode != &Node) {
ReplaceUses(&Node, ResNode);
IsModified = true;
}
}
CurDAG->RemoveDeadNodes();
} while (IsModified);
}
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