401 lines
14 KiB
C++
401 lines
14 KiB
C++
//===-- AMDGPUISelLowering.h - AMDGPU Lowering Interface --------*- C++ -*-===//
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//
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// The LLVM Compiler Infrastructure
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//
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// This file is distributed under the University of Illinois Open Source
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// License. See LICENSE.TXT for details.
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//
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//===----------------------------------------------------------------------===//
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//
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/// \file
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/// \brief Interface definition of the TargetLowering class that is common
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/// to all AMD GPUs.
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//
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//===----------------------------------------------------------------------===//
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#ifndef LLVM_LIB_TARGET_AMDGPU_AMDGPUISELLOWERING_H
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#define LLVM_LIB_TARGET_AMDGPU_AMDGPUISELLOWERING_H
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#include "AMDGPU.h"
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#include "llvm/CodeGen/CallingConvLower.h"
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#include "llvm/Target/TargetLowering.h"
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namespace llvm {
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class AMDGPUMachineFunction;
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class AMDGPUSubtarget;
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class MachineRegisterInfo;
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class AMDGPUTargetLowering : public TargetLowering {
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private:
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/// \returns AMDGPUISD::FFBH_U32 node if the incoming \p Op may have been
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/// legalized from a smaller type VT. Need to match pre-legalized type because
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/// the generic legalization inserts the add/sub between the select and
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/// compare.
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SDValue getFFBH_U32(SelectionDAG &DAG, SDValue Op, const SDLoc &DL) const;
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protected:
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const AMDGPUSubtarget *Subtarget;
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AMDGPUAS AMDGPUASI;
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SDValue LowerEXTRACT_SUBVECTOR(SDValue Op, SelectionDAG &DAG) const;
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SDValue LowerCONCAT_VECTORS(SDValue Op, SelectionDAG &DAG) const;
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/// \brief Split a vector store into multiple scalar stores.
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/// \returns The resulting chain.
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SDValue LowerFREM(SDValue Op, SelectionDAG &DAG) const;
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SDValue LowerFCEIL(SDValue Op, SelectionDAG &DAG) const;
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SDValue LowerFTRUNC(SDValue Op, SelectionDAG &DAG) const;
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SDValue LowerFRINT(SDValue Op, SelectionDAG &DAG) const;
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SDValue LowerFNEARBYINT(SDValue Op, SelectionDAG &DAG) const;
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SDValue LowerFROUND32_16(SDValue Op, SelectionDAG &DAG) const;
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SDValue LowerFROUND64(SDValue Op, SelectionDAG &DAG) const;
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SDValue LowerFROUND(SDValue Op, SelectionDAG &DAG) const;
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SDValue LowerFFLOOR(SDValue Op, SelectionDAG &DAG) const;
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SDValue LowerCTLZ(SDValue Op, SelectionDAG &DAG) const;
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SDValue LowerINT_TO_FP32(SDValue Op, SelectionDAG &DAG, bool Signed) const;
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SDValue LowerINT_TO_FP64(SDValue Op, SelectionDAG &DAG, bool Signed) const;
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SDValue LowerUINT_TO_FP(SDValue Op, SelectionDAG &DAG) const;
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SDValue LowerSINT_TO_FP(SDValue Op, SelectionDAG &DAG) const;
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SDValue LowerFP64_TO_INT(SDValue Op, SelectionDAG &DAG, bool Signed) const;
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SDValue LowerFP_TO_FP16(SDValue Op, SelectionDAG &DAG) const;
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SDValue LowerFP_TO_UINT(SDValue Op, SelectionDAG &DAG) const;
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SDValue LowerFP_TO_SINT(SDValue Op, SelectionDAG &DAG) const;
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SDValue LowerSIGN_EXTEND_INREG(SDValue Op, SelectionDAG &DAG) const;
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protected:
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bool shouldCombineMemoryType(EVT VT) const;
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SDValue performLoadCombine(SDNode *N, DAGCombinerInfo &DCI) const;
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SDValue performStoreCombine(SDNode *N, DAGCombinerInfo &DCI) const;
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SDValue performClampCombine(SDNode *N, DAGCombinerInfo &DCI) const;
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SDValue splitBinaryBitConstantOpImpl(DAGCombinerInfo &DCI, const SDLoc &SL,
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unsigned Opc, SDValue LHS,
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uint32_t ValLo, uint32_t ValHi) const;
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SDValue performShlCombine(SDNode *N, DAGCombinerInfo &DCI) const;
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SDValue performSraCombine(SDNode *N, DAGCombinerInfo &DCI) const;
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SDValue performSrlCombine(SDNode *N, DAGCombinerInfo &DCI) const;
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SDValue performMulCombine(SDNode *N, DAGCombinerInfo &DCI) const;
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SDValue performMulhsCombine(SDNode *N, DAGCombinerInfo &DCI) const;
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SDValue performMulhuCombine(SDNode *N, DAGCombinerInfo &DCI) const;
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SDValue performMulLoHi24Combine(SDNode *N, DAGCombinerInfo &DCI) const;
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SDValue performCtlzCombine(const SDLoc &SL, SDValue Cond, SDValue LHS,
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SDValue RHS, DAGCombinerInfo &DCI) const;
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SDValue performSelectCombine(SDNode *N, DAGCombinerInfo &DCI) const;
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SDValue performFNegCombine(SDNode *N, DAGCombinerInfo &DCI) const;
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SDValue performFAbsCombine(SDNode *N, DAGCombinerInfo &DCI) const;
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static EVT getEquivalentMemType(LLVMContext &Context, EVT VT);
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virtual SDValue LowerGlobalAddress(AMDGPUMachineFunction *MFI, SDValue Op,
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SelectionDAG &DAG) const;
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/// Return 64-bit value Op as two 32-bit integers.
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std::pair<SDValue, SDValue> split64BitValue(SDValue Op,
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SelectionDAG &DAG) const;
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SDValue getLoHalf64(SDValue Op, SelectionDAG &DAG) const;
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SDValue getHiHalf64(SDValue Op, SelectionDAG &DAG) const;
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/// \brief Split a vector load into 2 loads of half the vector.
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SDValue SplitVectorLoad(SDValue Op, SelectionDAG &DAG) const;
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/// \brief Split a vector store into 2 stores of half the vector.
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SDValue SplitVectorStore(SDValue Op, SelectionDAG &DAG) const;
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SDValue LowerSTORE(SDValue Op, SelectionDAG &DAG) const;
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SDValue LowerSDIVREM(SDValue Op, SelectionDAG &DAG) const;
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SDValue LowerUDIVREM(SDValue Op, SelectionDAG &DAG) const;
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SDValue LowerDIVREM24(SDValue Op, SelectionDAG &DAG, bool sign) const;
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void LowerUDIVREM64(SDValue Op, SelectionDAG &DAG,
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SmallVectorImpl<SDValue> &Results) const;
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void analyzeFormalArgumentsCompute(CCState &State,
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const SmallVectorImpl<ISD::InputArg> &Ins) const;
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void AnalyzeReturn(CCState &State,
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const SmallVectorImpl<ISD::OutputArg> &Outs) const;
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public:
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AMDGPUTargetLowering(const TargetMachine &TM, const AMDGPUSubtarget &STI);
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bool mayIgnoreSignedZero(SDValue Op) const {
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if (getTargetMachine().Options.NoSignedZerosFPMath)
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return true;
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const auto Flags = Op.getNode()->getFlags();
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if (Flags.isDefined())
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return Flags.hasNoSignedZeros();
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return false;
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}
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bool isFAbsFree(EVT VT) const override;
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bool isFNegFree(EVT VT) const override;
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bool isTruncateFree(EVT Src, EVT Dest) const override;
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bool isTruncateFree(Type *Src, Type *Dest) const override;
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bool isZExtFree(Type *Src, Type *Dest) const override;
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bool isZExtFree(EVT Src, EVT Dest) const override;
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bool isZExtFree(SDValue Val, EVT VT2) const override;
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bool isNarrowingProfitable(EVT VT1, EVT VT2) const override;
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MVT getVectorIdxTy(const DataLayout &) const override;
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bool isSelectSupported(SelectSupportKind) const override;
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bool isFPImmLegal(const APFloat &Imm, EVT VT) const override;
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bool ShouldShrinkFPConstant(EVT VT) const override;
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bool shouldReduceLoadWidth(SDNode *Load,
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ISD::LoadExtType ExtType,
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EVT ExtVT) const override;
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bool isLoadBitCastBeneficial(EVT, EVT) const final;
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bool storeOfVectorConstantIsCheap(EVT MemVT,
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unsigned NumElem,
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unsigned AS) const override;
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bool aggressivelyPreferBuildVectorSources(EVT VecVT) const override;
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bool isCheapToSpeculateCttz() const override;
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bool isCheapToSpeculateCtlz() const override;
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static CCAssignFn *CCAssignFnForCall(CallingConv::ID CC, bool IsVarArg);
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SDValue LowerReturn(SDValue Chain, CallingConv::ID CallConv, bool isVarArg,
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const SmallVectorImpl<ISD::OutputArg> &Outs,
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const SmallVectorImpl<SDValue> &OutVals, const SDLoc &DL,
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SelectionDAG &DAG) const override;
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SDValue LowerCall(CallLoweringInfo &CLI,
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SmallVectorImpl<SDValue> &InVals) const override;
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SDValue LowerDYNAMIC_STACKALLOC(SDValue Op,
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SelectionDAG &DAG) const;
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SDValue LowerOperation(SDValue Op, SelectionDAG &DAG) const override;
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SDValue PerformDAGCombine(SDNode *N, DAGCombinerInfo &DCI) const override;
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void ReplaceNodeResults(SDNode * N,
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SmallVectorImpl<SDValue> &Results,
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SelectionDAG &DAG) const override;
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SDValue combineFMinMaxLegacy(const SDLoc &DL, EVT VT, SDValue LHS,
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SDValue RHS, SDValue True, SDValue False,
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SDValue CC, DAGCombinerInfo &DCI) const;
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const char* getTargetNodeName(unsigned Opcode) const override;
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bool isFsqrtCheap(SDValue Operand, SelectionDAG &DAG) const override {
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return true;
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}
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SDValue getSqrtEstimate(SDValue Operand, SelectionDAG &DAG, int Enabled,
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int &RefinementSteps, bool &UseOneConstNR,
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bool Reciprocal) const override;
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SDValue getRecipEstimate(SDValue Operand, SelectionDAG &DAG, int Enabled,
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int &RefinementSteps) const override;
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virtual SDNode *PostISelFolding(MachineSDNode *N,
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SelectionDAG &DAG) const = 0;
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/// \brief Determine which of the bits specified in \p Mask are known to be
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/// either zero or one and return them in the \p KnownZero and \p KnownOne
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/// bitsets.
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void computeKnownBitsForTargetNode(const SDValue Op,
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KnownBits &Known,
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const APInt &DemandedElts,
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const SelectionDAG &DAG,
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unsigned Depth = 0) const override;
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unsigned ComputeNumSignBitsForTargetNode(SDValue Op, const APInt &DemandedElts,
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const SelectionDAG &DAG,
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unsigned Depth = 0) const override;
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/// \brief Helper function that adds Reg to the LiveIn list of the DAG's
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/// MachineFunction.
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///
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/// \returns a RegisterSDNode representing Reg.
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virtual SDValue CreateLiveInRegister(SelectionDAG &DAG,
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const TargetRegisterClass *RC,
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unsigned Reg, EVT VT) const;
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enum ImplicitParameter {
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FIRST_IMPLICIT,
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GRID_DIM = FIRST_IMPLICIT,
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GRID_OFFSET,
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};
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/// \brief Helper function that returns the byte offset of the given
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/// type of implicit parameter.
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uint32_t getImplicitParameterOffset(const AMDGPUMachineFunction *MFI,
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const ImplicitParameter Param) const;
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AMDGPUAS getAMDGPUAS() const {
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return AMDGPUASI;
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}
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MVT getFenceOperandTy(const DataLayout &DL) const override {
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return MVT::i32;
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}
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};
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namespace AMDGPUISD {
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enum NodeType : unsigned {
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// AMDIL ISD Opcodes
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FIRST_NUMBER = ISD::BUILTIN_OP_END,
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UMUL, // 32bit unsigned multiplication
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BRANCH_COND,
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// End AMDIL ISD Opcodes
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// Function call.
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CALL,
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TRAP,
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// Masked control flow nodes.
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IF,
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ELSE,
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LOOP,
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// A uniform kernel return that terminates the wavefront.
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ENDPGM,
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// Return to a shader part's epilog code.
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RETURN_TO_EPILOG,
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// Return with values from a non-entry function.
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RET_FLAG,
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DWORDADDR,
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FRACT,
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/// CLAMP value between 0.0 and 1.0. NaN clamped to 0, following clamp output
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/// modifier behavior with dx10_enable.
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CLAMP,
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// This is SETCC with the full mask result which is used for a compare with a
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// result bit per item in the wavefront.
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SETCC,
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SETREG,
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// FP ops with input and output chain.
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FMA_W_CHAIN,
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FMUL_W_CHAIN,
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// SIN_HW, COS_HW - f32 for SI, 1 ULP max error, valid from -100 pi to 100 pi.
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// Denormals handled on some parts.
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COS_HW,
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SIN_HW,
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FMAX_LEGACY,
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FMIN_LEGACY,
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FMAX3,
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SMAX3,
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UMAX3,
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FMIN3,
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SMIN3,
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UMIN3,
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FMED3,
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SMED3,
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UMED3,
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URECIP,
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DIV_SCALE,
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DIV_FMAS,
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DIV_FIXUP,
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// For emitting ISD::FMAD when f32 denormals are enabled because mac/mad is
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// treated as an illegal operation.
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FMAD_FTZ,
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TRIG_PREOP, // 1 ULP max error for f64
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// RCP, RSQ - For f32, 1 ULP max error, no denormal handling.
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// For f64, max error 2^29 ULP, handles denormals.
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RCP,
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RSQ,
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RCP_LEGACY,
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RSQ_LEGACY,
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FMUL_LEGACY,
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RSQ_CLAMP,
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LDEXP,
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FP_CLASS,
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DOT4,
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CARRY,
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BORROW,
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BFE_U32, // Extract range of bits with zero extension to 32-bits.
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BFE_I32, // Extract range of bits with sign extension to 32-bits.
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BFI, // (src0 & src1) | (~src0 & src2)
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BFM, // Insert a range of bits into a 32-bit word.
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FFBH_U32, // ctlz with -1 if input is zero.
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FFBH_I32,
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MUL_U24,
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MUL_I24,
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MULHI_U24,
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MULHI_I24,
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MAD_U24,
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MAD_I24,
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MUL_LOHI_I24,
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MUL_LOHI_U24,
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TEXTURE_FETCH,
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EXPORT, // exp on SI+
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EXPORT_DONE, // exp on SI+ with done bit set
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R600_EXPORT,
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CONST_ADDRESS,
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REGISTER_LOAD,
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REGISTER_STORE,
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SAMPLE,
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SAMPLEB,
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SAMPLED,
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SAMPLEL,
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// These cvt_f32_ubyte* nodes need to remain consecutive and in order.
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CVT_F32_UBYTE0,
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CVT_F32_UBYTE1,
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CVT_F32_UBYTE2,
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CVT_F32_UBYTE3,
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// Convert two float 32 numbers into a single register holding two packed f16
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// with round to zero.
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CVT_PKRTZ_F16_F32,
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// Same as the standard node, except the high bits of the resulting integer
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// are known 0.
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FP_TO_FP16,
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// Wrapper around fp16 results that are known to zero the high bits.
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FP16_ZEXT,
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/// This node is for VLIW targets and it is used to represent a vector
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/// that is stored in consecutive registers with the same channel.
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/// For example:
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/// |X |Y|Z|W|
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/// T0|v.x| | | |
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/// T1|v.y| | | |
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/// T2|v.z| | | |
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/// T3|v.w| | | |
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BUILD_VERTICAL_VECTOR,
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/// Pointer to the start of the shader's constant data.
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CONST_DATA_PTR,
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INIT_EXEC,
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INIT_EXEC_FROM_INPUT,
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SENDMSG,
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SENDMSGHALT,
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INTERP_MOV,
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INTERP_P1,
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INTERP_P2,
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PC_ADD_REL_OFFSET,
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KILL,
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DUMMY_CHAIN,
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FIRST_MEM_OPCODE_NUMBER = ISD::FIRST_TARGET_MEMORY_OPCODE,
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STORE_MSKOR,
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LOAD_CONSTANT,
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TBUFFER_STORE_FORMAT,
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ATOMIC_CMP_SWAP,
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ATOMIC_INC,
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ATOMIC_DEC,
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BUFFER_LOAD,
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BUFFER_LOAD_FORMAT,
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LAST_AMDGPU_ISD_NUMBER
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};
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} // End namespace AMDGPUISD
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} // End namespace llvm
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#endif
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