//===-- SIISelLowering.h - SI DAG Lowering Interface ------------*- C++ -*-===// // // Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions. // See https://llvm.org/LICENSE.txt for license information. // SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception // //===----------------------------------------------------------------------===// // /// \file /// SI DAG Lowering interface definition // //===----------------------------------------------------------------------===// #ifndef LLVM_LIB_TARGET_AMDGPU_SIISELLOWERING_H #define LLVM_LIB_TARGET_AMDGPU_SIISELLOWERING_H #include "AMDGPUISelLowering.h" #include "AMDGPUArgumentUsageInfo.h" namespace llvm { class GCNSubtarget; class SIMachineFunctionInfo; class SIRegisterInfo; namespace AMDGPU { struct ImageDimIntrinsicInfo; } class SITargetLowering final : public AMDGPUTargetLowering { private: const GCNSubtarget *Subtarget; public: 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; private: 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, EVT VT, 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 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 Ops, bool IsIntrinsic = false) const; SDValue lowerIntrinsicLoad(MemSDNode *M, bool IsFormat, SelectionDAG &DAG, ArrayRef 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 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 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 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, EVT MemVT, 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; public: /// \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 (, var-idx) should be /// expanded into a set of cmp/select instructions. static bool shouldExpandVectorDynExt(unsigned EltSize, unsigned NumElem, bool IsDivergentIdx); private: // 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. /// \returns 0 If there is a non-constant offset or if the offset is 0. /// Otherwise returns the constant offset. unsigned 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 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; public: 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 isShuffleMaskLegal(ArrayRef /*Mask*/, EVT /*VT*/) const override; bool getTgtMemIntrinsic(IntrinsicInfo &, const CallInst &, MachineFunction &MF, unsigned IntrinsicID) const override; bool getAddrModeArguments(IntrinsicInst * /*I*/, SmallVectorImpl &/*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 SelectionDAG &DAG) 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, unsigned 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; TargetLoweringBase::LegalizeTypeAction 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 &Exits) const override; SDValue LowerFormalArguments(SDValue Chain, CallingConv::ID CallConv, bool isVarArg, const SmallVectorImpl &Ins, const SDLoc &DL, SelectionDAG &DAG, SmallVectorImpl &InVals) const override; bool CanLowerReturn(CallingConv::ID CallConv, MachineFunction &MF, bool isVarArg, const SmallVectorImpl &Outs, LLVMContext &Context) const override; SDValue LowerReturn(SDValue Chain, CallingConv::ID CallConv, bool IsVarArg, const SmallVectorImpl &Outs, const SmallVectorImpl &OutVals, const SDLoc &DL, SelectionDAG &DAG) const override; void passSpecialInputs( CallLoweringInfo &CLI, CCState &CCInfo, const SIMachineFunctionInfo &Info, SmallVectorImpl> &RegsToPass, SmallVectorImpl &MemOpChains, SDValue Chain) const; SDValue LowerCallResult(SDValue Chain, SDValue InFlag, CallingConv::ID CallConv, bool isVarArg, const SmallVectorImpl &Ins, const SDLoc &DL, SelectionDAG &DAG, SmallVectorImpl &InVals, bool isThisReturn, SDValue ThisVal) const; bool mayBeEmittedAsTailCall(const CallInst *) const override; bool isEligibleForTailCallOptimization( SDValue Callee, CallingConv::ID CalleeCC, bool isVarArg, const SmallVectorImpl &Outs, const SmallVectorImpl &OutVals, const SmallVectorImpl &Ins, SelectionDAG &DAG) const; SDValue LowerCall(CallLoweringInfo &CLI, SmallVectorImpl &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; 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 isFMADLegal(const SelectionDAG &DAG, const SDNode *N) 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 &Results, SelectionDAG &DAG) const override; SDValue PerformDAGCombine(SDNode *N, DAGCombinerInfo &DCI) const override; SDNode *PostISelFolding(MachineSDNode *N, SelectionDAG &DAG) const override; 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 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 &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 denormalsEnabledForType(const SelectionDAG &DAG, EVT VT) 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 getTypeLegalizationCost(const DataLayout &DL, Type *Ty) const; }; } // End namespace llvm #endif