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//===-- SIISelLowering.h - SI DAG Lowering Interface ------------*- C++ -*-===//
// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
// See for license information.
// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
/// \file
/// SI DAG Lowering interface definition
#include "AMDGPUISelLowering.h"
#include "AMDGPUArgumentUsageInfo.h"
#include "llvm/CodeGen/MachineFunction.h"
namespace llvm {
class GCNSubtarget;
class SIMachineFunctionInfo;
class SIRegisterInfo;
namespace AMDGPU {
struct ImageDimIntrinsicInfo;
class SITargetLowering final : public AMDGPUTargetLowering {
const GCNSubtarget *Subtarget;
MVT getRegisterTypeForCallingConv(LLVMContext &Context,
CallingConv::ID CC,
EVT VT) const override;
unsigned getNumRegistersForCallingConv(LLVMContext &Context,
CallingConv::ID CC,
EVT VT) const override;
unsigned getVectorTypeBreakdownForCallingConv(
LLVMContext &Context, CallingConv::ID CC, EVT VT, EVT &IntermediateVT,
unsigned &NumIntermediates, MVT &RegisterVT) const override;
SDValue lowerKernArgParameterPtr(SelectionDAG &DAG, const SDLoc &SL,
SDValue Chain, uint64_t Offset) const;
SDValue getImplicitArgPtr(SelectionDAG &DAG, const SDLoc &SL) const;
SDValue lowerKernargMemParameter(SelectionDAG &DAG, EVT VT, EVT MemVT,
const SDLoc &SL, SDValue Chain,
uint64_t Offset, Align Alignment,
bool Signed,
const ISD::InputArg *Arg = nullptr) const;
SDValue lowerStackParameter(SelectionDAG &DAG, CCValAssign &VA,
const SDLoc &SL, SDValue Chain,
const ISD::InputArg &Arg) const;
SDValue getPreloadedValue(SelectionDAG &DAG,
const SIMachineFunctionInfo &MFI,
AMDGPUFunctionArgInfo::PreloadedValue) const;
SDValue LowerGlobalAddress(AMDGPUMachineFunction *MFI, SDValue Op,
SelectionDAG &DAG) const override;
SDValue lowerImplicitZextParam(SelectionDAG &DAG, SDValue Op,
MVT VT, unsigned Offset) const;
SDValue lowerImage(SDValue Op, const AMDGPU::ImageDimIntrinsicInfo *Intr,
SelectionDAG &DAG, bool WithChain) const;
SDValue lowerSBuffer(EVT VT, SDLoc DL, SDValue Rsrc, SDValue Offset,
SDValue CachePolicy, SelectionDAG &DAG) const;
SDValue lowerRawBufferAtomicIntrin(SDValue Op, SelectionDAG &DAG,
unsigned NewOpcode) const;
SDValue lowerStructBufferAtomicIntrin(SDValue Op, SelectionDAG &DAG,
unsigned NewOpcode) const;
SDValue LowerINTRINSIC_WO_CHAIN(SDValue Op, SelectionDAG &DAG) const;
SDValue LowerINTRINSIC_W_CHAIN(SDValue Op, SelectionDAG &DAG) const;
SDValue LowerINTRINSIC_VOID(SDValue Op, SelectionDAG &DAG) const;
// The raw.tbuffer and struct.tbuffer intrinsics have two offset args: offset
// (the offset that is included in bounds checking and swizzling, to be split
// between the instruction's voffset and immoffset fields) and soffset (the
// offset that is excluded from bounds checking and swizzling, to go in the
// instruction's soffset field). This function takes the first kind of
// offset and figures out how to split it between voffset and immoffset.
std::pair<SDValue, SDValue> splitBufferOffsets(SDValue Offset,
SelectionDAG &DAG) const;
SDValue widenLoad(LoadSDNode *Ld, DAGCombinerInfo &DCI) const;
SDValue LowerLOAD(SDValue Op, SelectionDAG &DAG) const;
SDValue LowerSELECT(SDValue Op, SelectionDAG &DAG) const;
SDValue lowerFastUnsafeFDIV(SDValue Op, SelectionDAG &DAG) const;
SDValue lowerFastUnsafeFDIV64(SDValue Op, SelectionDAG &DAG) const;
SDValue lowerFDIV_FAST(SDValue Op, SelectionDAG &DAG) const;
SDValue LowerFDIV16(SDValue Op, SelectionDAG &DAG) const;
SDValue LowerFDIV32(SDValue Op, SelectionDAG &DAG) const;
SDValue LowerFDIV64(SDValue Op, SelectionDAG &DAG) const;
SDValue LowerFDIV(SDValue Op, SelectionDAG &DAG) const;
SDValue LowerSTORE(SDValue Op, SelectionDAG &DAG) const;
SDValue LowerTrig(SDValue Op, SelectionDAG &DAG) const;
SDValue LowerATOMIC_CMP_SWAP(SDValue Op, SelectionDAG &DAG) const;
SDValue LowerBRCOND(SDValue Op, SelectionDAG &DAG) const;
SDValue LowerRETURNADDR(SDValue Op, SelectionDAG &DAG) const;
SDValue adjustLoadValueType(unsigned Opcode, MemSDNode *M,
SelectionDAG &DAG, ArrayRef<SDValue> Ops,
bool IsIntrinsic = false) const;
SDValue lowerIntrinsicLoad(MemSDNode *M, bool IsFormat, SelectionDAG &DAG,
ArrayRef<SDValue> Ops) const;
// Call DAG.getMemIntrinsicNode for a load, but first widen a dwordx3 type to
// dwordx4 if on SI.
SDValue getMemIntrinsicNode(unsigned Opcode, const SDLoc &DL, SDVTList VTList,
ArrayRef<SDValue> Ops, EVT MemVT,
MachineMemOperand *MMO, SelectionDAG &DAG) const;
SDValue handleD16VData(SDValue VData, SelectionDAG &DAG,
bool ImageStore = false) const;
/// Converts \p Op, which must be of floating point type, to the
/// floating point type \p VT, by either extending or truncating it.
SDValue getFPExtOrFPRound(SelectionDAG &DAG,
SDValue Op,
const SDLoc &DL,
EVT VT) const;
SDValue convertArgType(
SelectionDAG &DAG, EVT VT, EVT MemVT, const SDLoc &SL, SDValue Val,
bool Signed, const ISD::InputArg *Arg = nullptr) const;
/// Custom lowering for ISD::FP_ROUND for MVT::f16.
SDValue lowerFP_ROUND(SDValue Op, SelectionDAG &DAG) const;
SDValue lowerFMINNUM_FMAXNUM(SDValue Op, SelectionDAG &DAG) const;
SDValue lowerXMULO(SDValue Op, SelectionDAG &DAG) const;
SDValue lowerXMUL_LOHI(SDValue Op, SelectionDAG &DAG) const;
SDValue getSegmentAperture(unsigned AS, const SDLoc &DL,
SelectionDAG &DAG) const;
SDValue lowerADDRSPACECAST(SDValue Op, SelectionDAG &DAG) const;
SDValue lowerINSERT_SUBVECTOR(SDValue Op, SelectionDAG &DAG) const;
SDValue lowerINSERT_VECTOR_ELT(SDValue Op, SelectionDAG &DAG) const;
SDValue lowerEXTRACT_VECTOR_ELT(SDValue Op, SelectionDAG &DAG) const;
SDValue lowerVECTOR_SHUFFLE(SDValue Op, SelectionDAG &DAG) const;
SDValue lowerBUILD_VECTOR(SDValue Op, SelectionDAG &DAG) const;
SDValue lowerTRAP(SDValue Op, SelectionDAG &DAG) const;
SDValue lowerTrapEndpgm(SDValue Op, SelectionDAG &DAG) const;
SDValue lowerTrapHsaQueuePtr(SDValue Op, SelectionDAG &DAG) const;
SDValue lowerTrapHsa(SDValue Op, SelectionDAG &DAG) const;
SDValue lowerDEBUGTRAP(SDValue Op, SelectionDAG &DAG) const;
SDNode *adjustWritemask(MachineSDNode *&N, SelectionDAG &DAG) const;
SDValue performUCharToFloatCombine(SDNode *N,
DAGCombinerInfo &DCI) const;
SDValue performSHLPtrCombine(SDNode *N,
unsigned AS,
DAGCombinerInfo &DCI) const;
SDValue performMemSDNodeCombine(MemSDNode *N, DAGCombinerInfo &DCI) const;
SDValue splitBinaryBitConstantOp(DAGCombinerInfo &DCI, const SDLoc &SL,
unsigned Opc, SDValue LHS,
const ConstantSDNode *CRHS) const;
SDValue performAndCombine(SDNode *N, DAGCombinerInfo &DCI) const;
SDValue performOrCombine(SDNode *N, DAGCombinerInfo &DCI) const;
SDValue performXorCombine(SDNode *N, DAGCombinerInfo &DCI) const;
SDValue performZeroExtendCombine(SDNode *N, DAGCombinerInfo &DCI) const;
SDValue performSignExtendInRegCombine(SDNode *N, DAGCombinerInfo &DCI) const;
SDValue performClassCombine(SDNode *N, DAGCombinerInfo &DCI) const;
SDValue getCanonicalConstantFP(SelectionDAG &DAG, const SDLoc &SL, EVT VT,
const APFloat &C) const;
SDValue performFCanonicalizeCombine(SDNode *N, DAGCombinerInfo &DCI) const;
SDValue performFPMed3ImmCombine(SelectionDAG &DAG, const SDLoc &SL,
SDValue Op0, SDValue Op1) const;
SDValue performIntMed3ImmCombine(SelectionDAG &DAG, const SDLoc &SL,
SDValue Op0, SDValue Op1, bool Signed) const;
SDValue performMinMaxCombine(SDNode *N, DAGCombinerInfo &DCI) const;
SDValue performFMed3Combine(SDNode *N, DAGCombinerInfo &DCI) const;
SDValue performCvtPkRTZCombine(SDNode *N, DAGCombinerInfo &DCI) const;
SDValue performExtractVectorEltCombine(SDNode *N, DAGCombinerInfo &DCI) const;
SDValue performInsertVectorEltCombine(SDNode *N, DAGCombinerInfo &DCI) const;
SDValue reassociateScalarOps(SDNode *N, SelectionDAG &DAG) const;
unsigned getFusedOpcode(const SelectionDAG &DAG,
const SDNode *N0, const SDNode *N1) const;
SDValue performAddCombine(SDNode *N, DAGCombinerInfo &DCI) const;
SDValue performAddCarrySubCarryCombine(SDNode *N, DAGCombinerInfo &DCI) const;
SDValue performSubCombine(SDNode *N, DAGCombinerInfo &DCI) const;
SDValue performFAddCombine(SDNode *N, DAGCombinerInfo &DCI) const;
SDValue performFSubCombine(SDNode *N, DAGCombinerInfo &DCI) const;
SDValue performFMACombine(SDNode *N, DAGCombinerInfo &DCI) const;
SDValue performSetCCCombine(SDNode *N, DAGCombinerInfo &DCI) const;
SDValue performCvtF32UByteNCombine(SDNode *N, DAGCombinerInfo &DCI) const;
SDValue performClampCombine(SDNode *N, DAGCombinerInfo &DCI) const;
SDValue performRcpCombine(SDNode *N, DAGCombinerInfo &DCI) const;
bool isLegalFlatAddressingMode(const AddrMode &AM) const;
bool isLegalMUBUFAddressingMode(const AddrMode &AM) const;
unsigned isCFIntrinsic(const SDNode *Intr) const;
/// \returns True if fixup needs to be emitted for given global value \p GV,
/// false otherwise.
bool shouldEmitFixup(const GlobalValue *GV) const;
/// \returns True if GOT relocation needs to be emitted for given global value
/// \p GV, false otherwise.
bool shouldEmitGOTReloc(const GlobalValue *GV) const;
/// \returns True if PC-relative relocation needs to be emitted for given
/// global value \p GV, false otherwise.
bool shouldEmitPCReloc(const GlobalValue *GV) const;
/// \returns true if this should use a literal constant for an LDS address,
/// and not emit a relocation for an LDS global.
bool shouldUseLDSConstAddress(const GlobalValue *GV) const;
/// Check if EXTRACT_VECTOR_ELT/INSERT_VECTOR_ELT (<n x e>, var-idx) should be
/// expanded into a set of cmp/select instructions.
static bool shouldExpandVectorDynExt(unsigned EltSize, unsigned NumElem,
bool IsDivergentIdx);
// Analyze a combined offset from an amdgcn_buffer_ intrinsic and store the
// three offsets (voffset, soffset and instoffset) into the SDValue[3] array
// pointed to by Offsets.
void setBufferOffsets(SDValue CombinedOffset, SelectionDAG &DAG,
SDValue *Offsets, Align Alignment = Align(4)) const;
// Handle 8 bit and 16 bit buffer loads
SDValue handleByteShortBufferLoads(SelectionDAG &DAG, EVT LoadVT, SDLoc DL,
ArrayRef<SDValue> Ops, MemSDNode *M) const;
// Handle 8 bit and 16 bit buffer stores
SDValue handleByteShortBufferStores(SelectionDAG &DAG, EVT VDataType,
SDLoc DL, SDValue Ops[],
MemSDNode *M) const;
SITargetLowering(const TargetMachine &tm, const GCNSubtarget &STI);
const GCNSubtarget *getSubtarget() const;
bool isFPExtFoldable(const SelectionDAG &DAG, unsigned Opcode, EVT DestVT,
EVT SrcVT) const override;
bool isFPExtFoldable(const MachineInstr &MI, unsigned Opcode, LLT DestTy,
LLT SrcTy) const override;
bool isShuffleMaskLegal(ArrayRef<int> /*Mask*/, EVT /*VT*/) const override;
bool getTgtMemIntrinsic(IntrinsicInfo &, const CallInst &,
MachineFunction &MF,
unsigned IntrinsicID) const override;
bool getAddrModeArguments(IntrinsicInst * /*I*/,
SmallVectorImpl<Value*> &/*Ops*/,
Type *&/*AccessTy*/) const override;
bool isLegalGlobalAddressingMode(const AddrMode &AM) const;
bool isLegalAddressingMode(const DataLayout &DL, const AddrMode &AM, Type *Ty,
unsigned AS,
Instruction *I = nullptr) const override;
bool canMergeStoresTo(unsigned AS, EVT MemVT,
const MachineFunction &MF) const override;
bool allowsMisalignedMemoryAccessesImpl(
unsigned Size, unsigned AddrSpace, Align Alignment,
MachineMemOperand::Flags Flags = MachineMemOperand::MONone,
bool *IsFast = nullptr) const;
bool allowsMisalignedMemoryAccesses(
LLT Ty, unsigned AddrSpace, Align Alignment,
MachineMemOperand::Flags Flags = MachineMemOperand::MONone,
bool *IsFast = nullptr) const override {
if (IsFast)
*IsFast = false;
return allowsMisalignedMemoryAccessesImpl(Ty.getSizeInBits(), AddrSpace,
Alignment, Flags, IsFast);
bool allowsMisalignedMemoryAccesses(
EVT VT, unsigned AS, Align Alignment,
MachineMemOperand::Flags Flags = MachineMemOperand::MONone,
bool *IsFast = nullptr) const override;
EVT getOptimalMemOpType(const MemOp &Op,
const AttributeList &FuncAttributes) const override;
bool isMemOpUniform(const SDNode *N) const;
bool isMemOpHasNoClobberedMemOperand(const SDNode *N) const;
static bool isNonGlobalAddrSpace(unsigned AS);
bool isFreeAddrSpaceCast(unsigned SrcAS, unsigned DestAS) const override;
getPreferredVectorAction(MVT VT) const override;
bool shouldConvertConstantLoadToIntImm(const APInt &Imm,
Type *Ty) const override;
bool isTypeDesirableForOp(unsigned Op, EVT VT) const override;
bool isOffsetFoldingLegal(const GlobalAddressSDNode *GA) const override;
bool supportSplitCSR(MachineFunction *MF) const override;
void initializeSplitCSR(MachineBasicBlock *Entry) const override;
void insertCopiesSplitCSR(
MachineBasicBlock *Entry,
const SmallVectorImpl<MachineBasicBlock *> &Exits) const override;
SDValue LowerFormalArguments(SDValue Chain, CallingConv::ID CallConv,
bool isVarArg,
const SmallVectorImpl<ISD::InputArg> &Ins,
const SDLoc &DL, SelectionDAG &DAG,
SmallVectorImpl<SDValue> &InVals) const override;
bool CanLowerReturn(CallingConv::ID CallConv,
MachineFunction &MF, bool isVarArg,
const SmallVectorImpl<ISD::OutputArg> &Outs,
LLVMContext &Context) const override;
SDValue LowerReturn(SDValue Chain, CallingConv::ID CallConv, bool IsVarArg,
const SmallVectorImpl<ISD::OutputArg> &Outs,
const SmallVectorImpl<SDValue> &OutVals, const SDLoc &DL,
SelectionDAG &DAG) const override;
void passSpecialInputs(
CallLoweringInfo &CLI,
CCState &CCInfo,
const SIMachineFunctionInfo &Info,
SmallVectorImpl<std::pair<unsigned, SDValue>> &RegsToPass,
SmallVectorImpl<SDValue> &MemOpChains,
SDValue Chain) const;
SDValue LowerCallResult(SDValue Chain, SDValue InFlag,
CallingConv::ID CallConv, bool isVarArg,
const SmallVectorImpl<ISD::InputArg> &Ins,
const SDLoc &DL, SelectionDAG &DAG,
SmallVectorImpl<SDValue> &InVals, bool isThisReturn,
SDValue ThisVal) const;
bool mayBeEmittedAsTailCall(const CallInst *) const override;
bool isEligibleForTailCallOptimization(
SDValue Callee, CallingConv::ID CalleeCC, bool isVarArg,
const SmallVectorImpl<ISD::OutputArg> &Outs,
const SmallVectorImpl<SDValue> &OutVals,
const SmallVectorImpl<ISD::InputArg> &Ins, SelectionDAG &DAG) const;
SDValue LowerCall(CallLoweringInfo &CLI,
SmallVectorImpl<SDValue> &InVals) const override;
SDValue lowerDYNAMIC_STACKALLOCImpl(SDValue Op, SelectionDAG &DAG) const;
SDValue LowerDYNAMIC_STACKALLOC(SDValue Op, SelectionDAG &DAG) const;
Register getRegisterByName(const char* RegName, LLT VT,
const MachineFunction &MF) const override;
MachineBasicBlock *splitKillBlock(MachineInstr &MI,
MachineBasicBlock *BB) const;
void bundleInstWithWaitcnt(MachineInstr &MI) const;
MachineBasicBlock *emitGWSMemViolTestLoop(MachineInstr &MI,
MachineBasicBlock *BB) const;
MachineBasicBlock *
EmitInstrWithCustomInserter(MachineInstr &MI,
MachineBasicBlock *BB) const override;
bool hasBitPreservingFPLogic(EVT VT) const override;
bool enableAggressiveFMAFusion(EVT VT) const override;
bool enableAggressiveFMAFusion(LLT Ty) const override;
EVT getSetCCResultType(const DataLayout &DL, LLVMContext &Context,
EVT VT) const override;
MVT getScalarShiftAmountTy(const DataLayout &, EVT) const override;
LLT getPreferredShiftAmountTy(LLT Ty) const override;
bool isFMAFasterThanFMulAndFAdd(const MachineFunction &MF,
EVT VT) const override;
bool isFMAFasterThanFMulAndFAdd(const MachineFunction &MF,
const LLT Ty) const override;
bool isFMADLegal(const SelectionDAG &DAG, const SDNode *N) const override;
bool isFMADLegal(const MachineInstr &MI, const LLT Ty) const override;
SDValue splitUnaryVectorOp(SDValue Op, SelectionDAG &DAG) const;
SDValue splitBinaryVectorOp(SDValue Op, SelectionDAG &DAG) const;
SDValue splitTernaryVectorOp(SDValue Op, SelectionDAG &DAG) const;
SDValue LowerOperation(SDValue Op, SelectionDAG &DAG) const override;
void ReplaceNodeResults(SDNode *N, SmallVectorImpl<SDValue> &Results,
SelectionDAG &DAG) const override;
SDValue PerformDAGCombine(SDNode *N, DAGCombinerInfo &DCI) const override;
SDNode *PostISelFolding(MachineSDNode *N, SelectionDAG &DAG) const override;
void AddIMGInit(MachineInstr &MI) const;
void AdjustInstrPostInstrSelection(MachineInstr &MI,
SDNode *Node) const override;
SDNode *legalizeTargetIndependentNode(SDNode *Node, SelectionDAG &DAG) const;
MachineSDNode *wrapAddr64Rsrc(SelectionDAG &DAG, const SDLoc &DL,
SDValue Ptr) const;
MachineSDNode *buildRSRC(SelectionDAG &DAG, const SDLoc &DL, SDValue Ptr,
uint32_t RsrcDword1, uint64_t RsrcDword2And3) const;
std::pair<unsigned, const TargetRegisterClass *>
getRegForInlineAsmConstraint(const TargetRegisterInfo *TRI,
StringRef Constraint, MVT VT) const override;
ConstraintType getConstraintType(StringRef Constraint) const override;
void LowerAsmOperandForConstraint(SDValue Op,
std::string &Constraint,
std::vector<SDValue> &Ops,
SelectionDAG &DAG) const override;
bool getAsmOperandConstVal(SDValue Op, uint64_t &Val) const;
bool checkAsmConstraintVal(SDValue Op,
const std::string &Constraint,
uint64_t Val) const;
bool checkAsmConstraintValA(SDValue Op,
uint64_t Val,
unsigned MaxSize = 64) const;
SDValue copyToM0(SelectionDAG &DAG, SDValue Chain, const SDLoc &DL,
SDValue V) const;
void finalizeLowering(MachineFunction &MF) const override;
void computeKnownBitsForFrameIndex(int FrameIdx,
KnownBits &Known,
const MachineFunction &MF) const override;
void computeKnownBitsForTargetInstr(GISelKnownBits &Analysis, Register R,
KnownBits &Known,
const APInt &DemandedElts,
const MachineRegisterInfo &MRI,
unsigned Depth = 0) const override;
Align computeKnownAlignForTargetInstr(GISelKnownBits &Analysis, Register R,
const MachineRegisterInfo &MRI,
unsigned Depth = 0) const override;
bool isSDNodeSourceOfDivergence(const SDNode *N,
FunctionLoweringInfo *FLI, LegacyDivergenceAnalysis *DA) const override;
bool isCanonicalized(SelectionDAG &DAG, SDValue Op,
unsigned MaxDepth = 5) const;
bool isCanonicalized(Register Reg, MachineFunction &MF,
unsigned MaxDepth = 5) const;
bool denormalsEnabledForType(const SelectionDAG &DAG, EVT VT) const;
bool denormalsEnabledForType(LLT Ty, MachineFunction &MF) const;
bool isKnownNeverNaNForTargetNode(SDValue Op,
const SelectionDAG &DAG,
bool SNaN = false,
unsigned Depth = 0) const override;
AtomicExpansionKind shouldExpandAtomicRMWInIR(AtomicRMWInst *) const override;
virtual const TargetRegisterClass *
getRegClassFor(MVT VT, bool isDivergent) const override;
virtual bool requiresUniformRegister(MachineFunction &MF,
const Value *V) const override;
Align getPrefLoopAlignment(MachineLoop *ML) const override;
void allocateHSAUserSGPRs(CCState &CCInfo,
MachineFunction &MF,
const SIRegisterInfo &TRI,
SIMachineFunctionInfo &Info) const;
void allocateSystemSGPRs(CCState &CCInfo,
MachineFunction &MF,
SIMachineFunctionInfo &Info,
CallingConv::ID CallConv,
bool IsShader) const;
void allocateSpecialEntryInputVGPRs(CCState &CCInfo,
MachineFunction &MF,
const SIRegisterInfo &TRI,
SIMachineFunctionInfo &Info) const;
void allocateSpecialInputSGPRs(
CCState &CCInfo,
MachineFunction &MF,
const SIRegisterInfo &TRI,
SIMachineFunctionInfo &Info) const;
void allocateSpecialInputVGPRs(CCState &CCInfo,
MachineFunction &MF,
const SIRegisterInfo &TRI,
SIMachineFunctionInfo &Info) const;
void allocateSpecialInputVGPRsFixed(CCState &CCInfo,
MachineFunction &MF,
const SIRegisterInfo &TRI,
SIMachineFunctionInfo &Info) const;
std::pair<InstructionCost, MVT> getTypeLegalizationCost(const DataLayout &DL,
Type *Ty) const;
} // End namespace llvm