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llvm-project/llvm/lib/Target/AMDGPU/AMDGPUISelLowering.h

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//===-- AMDGPUISelLowering.h - AMDGPU 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
/// Interface definition of the TargetLowering class that is common
/// to all AMD GPUs.
//
//===----------------------------------------------------------------------===//
#ifndef LLVM_LIB_TARGET_AMDGPU_AMDGPUISELLOWERING_H
#define LLVM_LIB_TARGET_AMDGPU_AMDGPUISELLOWERING_H
#include "AMDGPU.h"
#include "llvm/CodeGen/CallingConvLower.h"
#include "llvm/CodeGen/TargetLowering.h"
namespace llvm {
class AMDGPUMachineFunction;
class AMDGPUSubtarget;
struct ArgDescriptor;
class AMDGPUTargetLowering : public TargetLowering {
private:
const AMDGPUSubtarget *Subtarget;
/// \returns AMDGPUISD::FFBH_U32 node if the incoming \p Op may have been
/// legalized from a smaller type VT. Need to match pre-legalized type because
/// the generic legalization inserts the add/sub between the select and
/// compare.
SDValue getFFBX_U32(SelectionDAG &DAG, SDValue Op, const SDLoc &DL, unsigned Opc) const;
public:
static unsigned numBitsUnsigned(SDValue Op, SelectionDAG &DAG);
static unsigned numBitsSigned(SDValue Op, SelectionDAG &DAG);
static bool hasDefinedInitializer(const GlobalValue *GV);
protected:
SDValue LowerEXTRACT_SUBVECTOR(SDValue Op, SelectionDAG &DAG) const;
SDValue LowerCONCAT_VECTORS(SDValue Op, SelectionDAG &DAG) const;
/// Split a vector store into multiple scalar stores.
/// \returns The resulting chain.
SDValue LowerFREM(SDValue Op, SelectionDAG &DAG) const;
SDValue LowerFCEIL(SDValue Op, SelectionDAG &DAG) const;
SDValue LowerFTRUNC(SDValue Op, SelectionDAG &DAG) const;
SDValue LowerFRINT(SDValue Op, SelectionDAG &DAG) const;
SDValue LowerFNEARBYINT(SDValue Op, SelectionDAG &DAG) const;
SDValue LowerFROUND_LegalFTRUNC(SDValue Op, SelectionDAG &DAG) const;
SDValue LowerFROUND64(SDValue Op, SelectionDAG &DAG) const;
SDValue LowerFROUND(SDValue Op, SelectionDAG &DAG) const;
SDValue LowerFFLOOR(SDValue Op, SelectionDAG &DAG) const;
SDValue LowerFLOG(SDValue Op, SelectionDAG &DAG,
double Log2BaseInverted) const;
SDValue lowerFEXP(SDValue Op, SelectionDAG &DAG) const;
SDValue LowerCTLZ_CTTZ(SDValue Op, SelectionDAG &DAG) const;
SDValue LowerINT_TO_FP32(SDValue Op, SelectionDAG &DAG, bool Signed) const;
SDValue LowerINT_TO_FP64(SDValue Op, SelectionDAG &DAG, bool Signed) const;
SDValue LowerUINT_TO_FP(SDValue Op, SelectionDAG &DAG) const;
SDValue LowerSINT_TO_FP(SDValue Op, SelectionDAG &DAG) const;
SDValue LowerFP64_TO_INT(SDValue Op, SelectionDAG &DAG, bool Signed) const;
SDValue LowerFP_TO_FP16(SDValue Op, SelectionDAG &DAG) const;
SDValue LowerFP_TO_UINT(SDValue Op, SelectionDAG &DAG) const;
SDValue LowerFP_TO_SINT(SDValue Op, SelectionDAG &DAG) const;
SDValue LowerSIGN_EXTEND_INREG(SDValue Op, SelectionDAG &DAG) const;
protected:
bool shouldCombineMemoryType(EVT VT) const;
SDValue performLoadCombine(SDNode *N, DAGCombinerInfo &DCI) const;
SDValue performStoreCombine(SDNode *N, DAGCombinerInfo &DCI) const;
SDValue performAssertSZExtCombine(SDNode *N, DAGCombinerInfo &DCI) const;
SDValue performIntrinsicWOChainCombine(SDNode *N, DAGCombinerInfo &DCI) const;
SDValue splitBinaryBitConstantOpImpl(DAGCombinerInfo &DCI, const SDLoc &SL,
unsigned Opc, SDValue LHS,
uint32_t ValLo, uint32_t ValHi) const;
SDValue performShlCombine(SDNode *N, DAGCombinerInfo &DCI) const;
SDValue performSraCombine(SDNode *N, DAGCombinerInfo &DCI) const;
SDValue performSrlCombine(SDNode *N, DAGCombinerInfo &DCI) const;
SDValue performTruncateCombine(SDNode *N, DAGCombinerInfo &DCI) const;
SDValue performMulCombine(SDNode *N, DAGCombinerInfo &DCI) const;
SDValue performMulhsCombine(SDNode *N, DAGCombinerInfo &DCI) const;
SDValue performMulhuCombine(SDNode *N, DAGCombinerInfo &DCI) const;
SDValue performMulLoHi24Combine(SDNode *N, DAGCombinerInfo &DCI) const;
SDValue performCtlz_CttzCombine(const SDLoc &SL, SDValue Cond, SDValue LHS,
SDValue RHS, DAGCombinerInfo &DCI) const;
SDValue performSelectCombine(SDNode *N, DAGCombinerInfo &DCI) const;
bool isConstantCostlierToNegate(SDValue N) const;
SDValue performFNegCombine(SDNode *N, DAGCombinerInfo &DCI) const;
SDValue performFAbsCombine(SDNode *N, DAGCombinerInfo &DCI) const;
SDValue performRcpCombine(SDNode *N, DAGCombinerInfo &DCI) const;
static EVT getEquivalentMemType(LLVMContext &Context, EVT VT);
virtual SDValue LowerGlobalAddress(AMDGPUMachineFunction *MFI, SDValue Op,
SelectionDAG &DAG) const;
/// Return 64-bit value Op as two 32-bit integers.
std::pair<SDValue, SDValue> split64BitValue(SDValue Op,
SelectionDAG &DAG) const;
SDValue getLoHalf64(SDValue Op, SelectionDAG &DAG) const;
SDValue getHiHalf64(SDValue Op, SelectionDAG &DAG) const;
/// Split a vector type into two parts. The first part is a power of two
/// vector. The second part is whatever is left over, and is a scalar if it
/// would otherwise be a 1-vector.
std::pair<EVT, EVT> getSplitDestVTs(const EVT &VT, SelectionDAG &DAG) const;
/// Split a vector value into two parts of types LoVT and HiVT. HiVT could be
/// scalar.
std::pair<SDValue, SDValue> splitVector(const SDValue &N, const SDLoc &DL,
const EVT &LoVT, const EVT &HighVT,
SelectionDAG &DAG) const;
/// Split a vector load into 2 loads of half the vector.
SDValue SplitVectorLoad(SDValue Op, SelectionDAG &DAG) const;
/// Widen a vector load from vec3 to vec4.
SDValue WidenVectorLoad(SDValue Op, SelectionDAG &DAG) const;
/// Split a vector store into 2 stores of half the vector.
SDValue SplitVectorStore(SDValue Op, SelectionDAG &DAG) const;
SDValue LowerSTORE(SDValue Op, SelectionDAG &DAG) const;
SDValue LowerSDIVREM(SDValue Op, SelectionDAG &DAG) const;
SDValue LowerUDIVREM(SDValue Op, SelectionDAG &DAG) const;
SDValue LowerDIVREM24(SDValue Op, SelectionDAG &DAG, bool sign) const;
void LowerUDIVREM64(SDValue Op, SelectionDAG &DAG,
SmallVectorImpl<SDValue> &Results) const;
void analyzeFormalArgumentsCompute(
CCState &State,
const SmallVectorImpl<ISD::InputArg> &Ins) const;
public:
AMDGPUTargetLowering(const TargetMachine &TM, const AMDGPUSubtarget &STI);
bool mayIgnoreSignedZero(SDValue Op) const {
if (getTargetMachine().Options.NoSignedZerosFPMath)
return true;
const auto Flags = Op.getNode()->getFlags();
if (Flags.isDefined())
return Flags.hasNoSignedZeros();
return false;
}
static inline SDValue stripBitcast(SDValue Val) {
return Val.getOpcode() == ISD::BITCAST ? Val.getOperand(0) : Val;
}
static bool allUsesHaveSourceMods(const SDNode *N,
unsigned CostThreshold = 4);
bool isFAbsFree(EVT VT) const override;
bool isFNegFree(EVT VT) const override;
bool isTruncateFree(EVT Src, EVT Dest) const override;
bool isTruncateFree(Type *Src, Type *Dest) const override;
bool isZExtFree(Type *Src, Type *Dest) const override;
bool isZExtFree(EVT Src, EVT Dest) const override;
bool isZExtFree(SDValue Val, EVT VT2) const override;
bool isNarrowingProfitable(EVT VT1, EVT VT2) const override;
MVT getVectorIdxTy(const DataLayout &) const override;
bool isSelectSupported(SelectSupportKind) const override;
bool isFPImmLegal(const APFloat &Imm, EVT VT,
bool ForCodeSize) const override;
bool ShouldShrinkFPConstant(EVT VT) const override;
bool shouldReduceLoadWidth(SDNode *Load,
ISD::LoadExtType ExtType,
EVT ExtVT) const override;
bool isLoadBitCastBeneficial(EVT, EVT, const SelectionDAG &DAG,
const MachineMemOperand &MMO) const final;
bool storeOfVectorConstantIsCheap(EVT MemVT,
unsigned NumElem,
unsigned AS) const override;
bool aggressivelyPreferBuildVectorSources(EVT VecVT) const override;
bool isCheapToSpeculateCttz() const override;
bool isCheapToSpeculateCtlz() const override;
bool isSDNodeAlwaysUniform(const SDNode *N) const override;
static CCAssignFn *CCAssignFnForCall(CallingConv::ID CC, bool IsVarArg);
static CCAssignFn *CCAssignFnForReturn(CallingConv::ID CC, bool IsVarArg);
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;
SDValue addTokenForArgument(SDValue Chain,
SelectionDAG &DAG,
MachineFrameInfo &MFI,
int ClobberedFI) const;
SDValue lowerUnhandledCall(CallLoweringInfo &CLI,
SmallVectorImpl<SDValue> &InVals,
StringRef Reason) const;
SDValue LowerCall(CallLoweringInfo &CLI,
SmallVectorImpl<SDValue> &InVals) const override;
SDValue LowerDYNAMIC_STACKALLOC(SDValue Op,
SelectionDAG &DAG) const;
SDValue LowerOperation(SDValue Op, SelectionDAG &DAG) const override;
SDValue PerformDAGCombine(SDNode *N, DAGCombinerInfo &DCI) const override;
void ReplaceNodeResults(SDNode * N,
SmallVectorImpl<SDValue> &Results,
SelectionDAG &DAG) const override;
SDValue combineFMinMaxLegacy(const SDLoc &DL, EVT VT, SDValue LHS,
SDValue RHS, SDValue True, SDValue False,
SDValue CC, DAGCombinerInfo &DCI) const;
const char* getTargetNodeName(unsigned Opcode) const override;
// FIXME: Turn off MergeConsecutiveStores() before Instruction Selection for
// AMDGPU. Commit r319036,
// (https://github.com/llvm/llvm-project/commit/db77e57ea86d941a4262ef60261692f4cb6893e6)
// turned on MergeConsecutiveStores() before Instruction Selection for all
// targets. Enough AMDGPU compiles go into an infinite loop (
// MergeConsecutiveStores() merges two stores; LegalizeStoreOps() un-merges;
// MergeConsecutiveStores() re-merges, etc. ) to warrant turning it off for
// now.
bool mergeStoresAfterLegalization(EVT) const override { return false; }
bool isFsqrtCheap(SDValue Operand, SelectionDAG &DAG) const override {
return true;
}
SDValue getSqrtEstimate(SDValue Operand, SelectionDAG &DAG, int Enabled,
int &RefinementSteps, bool &UseOneConstNR,
bool Reciprocal) const override;
SDValue getRecipEstimate(SDValue Operand, SelectionDAG &DAG, int Enabled,
int &RefinementSteps) const override;
virtual SDNode *PostISelFolding(MachineSDNode *N,
SelectionDAG &DAG) const = 0;
/// Determine which of the bits specified in \p Mask are known to be
/// either zero or one and return them in the \p KnownZero and \p KnownOne
/// bitsets.
void computeKnownBitsForTargetNode(const SDValue Op,
KnownBits &Known,
const APInt &DemandedElts,
const SelectionDAG &DAG,
unsigned Depth = 0) const override;
unsigned ComputeNumSignBitsForTargetNode(SDValue Op, const APInt &DemandedElts,
const SelectionDAG &DAG,
unsigned Depth = 0) const override;
bool isKnownNeverNaNForTargetNode(SDValue Op,
const SelectionDAG &DAG,
bool SNaN = false,
unsigned Depth = 0) const override;
/// Helper function that adds Reg to the LiveIn list of the DAG's
/// MachineFunction.
///
/// \returns a RegisterSDNode representing Reg if \p RawReg is true, otherwise
/// a copy from the register.
SDValue CreateLiveInRegister(SelectionDAG &DAG,
const TargetRegisterClass *RC,
unsigned Reg, EVT VT,
const SDLoc &SL,
bool RawReg = false) const;
SDValue CreateLiveInRegister(SelectionDAG &DAG,
const TargetRegisterClass *RC,
unsigned Reg, EVT VT) const {
return CreateLiveInRegister(DAG, RC, Reg, VT, SDLoc(DAG.getEntryNode()));
}
// Returns the raw live in register rather than a copy from it.
SDValue CreateLiveInRegisterRaw(SelectionDAG &DAG,
const TargetRegisterClass *RC,
unsigned Reg, EVT VT) const {
return CreateLiveInRegister(DAG, RC, Reg, VT, SDLoc(DAG.getEntryNode()), true);
}
/// Similar to CreateLiveInRegister, except value maybe loaded from a stack
/// slot rather than passed in a register.
SDValue loadStackInputValue(SelectionDAG &DAG,
EVT VT,
const SDLoc &SL,
int64_t Offset) const;
SDValue storeStackInputValue(SelectionDAG &DAG,
const SDLoc &SL,
SDValue Chain,
SDValue ArgVal,
int64_t Offset) const;
SDValue loadInputValue(SelectionDAG &DAG,
const TargetRegisterClass *RC,
EVT VT, const SDLoc &SL,
const ArgDescriptor &Arg) const;
enum ImplicitParameter {
FIRST_IMPLICIT,
GRID_DIM = FIRST_IMPLICIT,
GRID_OFFSET,
};
/// Helper function that returns the byte offset of the given
/// type of implicit parameter.
uint32_t getImplicitParameterOffset(const MachineFunction &MF,
const ImplicitParameter Param) const;
MVT getFenceOperandTy(const DataLayout &DL) const override {
return MVT::i32;
}
AtomicExpansionKind shouldExpandAtomicRMWInIR(AtomicRMWInst *) const override;
};
namespace AMDGPUISD {
enum NodeType : unsigned {
// AMDIL ISD Opcodes
FIRST_NUMBER = ISD::BUILTIN_OP_END,
UMUL, // 32bit unsigned multiplication
BRANCH_COND,
// End AMDIL ISD Opcodes
// Function call.
CALL,
TC_RETURN,
TRAP,
// Masked control flow nodes.
IF,
ELSE,
LOOP,
// A uniform kernel return that terminates the wavefront.
ENDPGM,
// Return to a shader part's epilog code.
RETURN_TO_EPILOG,
// Return with values from a non-entry function.
RET_FLAG,
DWORDADDR,
FRACT,
/// CLAMP value between 0.0 and 1.0. NaN clamped to 0, following clamp output
/// modifier behavior with dx10_enable.
CLAMP,
// This is SETCC with the full mask result which is used for a compare with a
// result bit per item in the wavefront.
SETCC,
SETREG,
DENORM_MODE,
// FP ops with input and output chain.
FMA_W_CHAIN,
FMUL_W_CHAIN,
// SIN_HW, COS_HW - f32 for SI, 1 ULP max error, valid from -100 pi to 100 pi.
// Denormals handled on some parts.
COS_HW,
SIN_HW,
FMAX_LEGACY,
FMIN_LEGACY,
FMAX3,
SMAX3,
UMAX3,
FMIN3,
SMIN3,
UMIN3,
FMED3,
SMED3,
UMED3,
FDOT2,
URECIP,
DIV_SCALE,
DIV_FMAS,
DIV_FIXUP,
// For emitting ISD::FMAD when f32 denormals are enabled because mac/mad is
// treated as an illegal operation.
FMAD_FTZ,
TRIG_PREOP, // 1 ULP max error for f64
// RCP, RSQ - For f32, 1 ULP max error, no denormal handling.
// For f64, max error 2^29 ULP, handles denormals.
RCP,
RSQ,
RCP_LEGACY,
RSQ_LEGACY,
RCP_IFLAG,
FMUL_LEGACY,
RSQ_CLAMP,
LDEXP,
FP_CLASS,
DOT4,
CARRY,
BORROW,
BFE_U32, // Extract range of bits with zero extension to 32-bits.
BFE_I32, // Extract range of bits with sign extension to 32-bits.
BFI, // (src0 & src1) | (~src0 & src2)
BFM, // Insert a range of bits into a 32-bit word.
FFBH_U32, // ctlz with -1 if input is zero.
FFBH_I32,
FFBL_B32, // cttz with -1 if input is zero.
MUL_U24,
MUL_I24,
MULHI_U24,
MULHI_I24,
MAD_U24,
MAD_I24,
MAD_U64_U32,
MAD_I64_I32,
MUL_LOHI_I24,
MUL_LOHI_U24,
PERM,
TEXTURE_FETCH,
R600_EXPORT,
CONST_ADDRESS,
REGISTER_LOAD,
REGISTER_STORE,
SAMPLE,
SAMPLEB,
SAMPLED,
SAMPLEL,
// These cvt_f32_ubyte* nodes need to remain consecutive and in order.
CVT_F32_UBYTE0,
CVT_F32_UBYTE1,
CVT_F32_UBYTE2,
CVT_F32_UBYTE3,
// Convert two float 32 numbers into a single register holding two packed f16
// with round to zero.
CVT_PKRTZ_F16_F32,
CVT_PKNORM_I16_F32,
CVT_PKNORM_U16_F32,
CVT_PK_I16_I32,
CVT_PK_U16_U32,
// Same as the standard node, except the high bits of the resulting integer
// are known 0.
FP_TO_FP16,
// Wrapper around fp16 results that are known to zero the high bits.
FP16_ZEXT,
/// This node is for VLIW targets and it is used to represent a vector
/// that is stored in consecutive registers with the same channel.
/// For example:
/// |X |Y|Z|W|
/// T0|v.x| | | |
/// T1|v.y| | | |
/// T2|v.z| | | |
/// T3|v.w| | | |
BUILD_VERTICAL_VECTOR,
/// Pointer to the start of the shader's constant data.
CONST_DATA_PTR,
PC_ADD_REL_OFFSET,
LDS,
KILL,
DUMMY_CHAIN,
FIRST_MEM_OPCODE_NUMBER = ISD::FIRST_TARGET_MEMORY_OPCODE,
LOAD_D16_HI,
LOAD_D16_LO,
LOAD_D16_HI_I8,
LOAD_D16_HI_U8,
LOAD_D16_LO_I8,
LOAD_D16_LO_U8,
STORE_MSKOR,
LOAD_CONSTANT,
TBUFFER_STORE_FORMAT,
TBUFFER_STORE_FORMAT_D16,
TBUFFER_LOAD_FORMAT,
TBUFFER_LOAD_FORMAT_D16,
DS_ORDERED_COUNT,
ATOMIC_CMP_SWAP,
ATOMIC_INC,
ATOMIC_DEC,
ATOMIC_LOAD_FMIN,
ATOMIC_LOAD_FMAX,
BUFFER_LOAD,
BUFFER_LOAD_UBYTE,
BUFFER_LOAD_USHORT,
BUFFER_LOAD_BYTE,
BUFFER_LOAD_SHORT,
BUFFER_LOAD_FORMAT,
BUFFER_LOAD_FORMAT_D16,
SBUFFER_LOAD,
BUFFER_STORE,
BUFFER_STORE_BYTE,
BUFFER_STORE_SHORT,
BUFFER_STORE_FORMAT,
BUFFER_STORE_FORMAT_D16,
BUFFER_ATOMIC_SWAP,
BUFFER_ATOMIC_ADD,
BUFFER_ATOMIC_SUB,
BUFFER_ATOMIC_SMIN,
BUFFER_ATOMIC_UMIN,
BUFFER_ATOMIC_SMAX,
BUFFER_ATOMIC_UMAX,
BUFFER_ATOMIC_AND,
BUFFER_ATOMIC_OR,
BUFFER_ATOMIC_XOR,
BUFFER_ATOMIC_INC,
BUFFER_ATOMIC_DEC,
BUFFER_ATOMIC_CMPSWAP,
BUFFER_ATOMIC_FADD,
BUFFER_ATOMIC_PK_FADD,
ATOMIC_PK_FADD,
LAST_AMDGPU_ISD_NUMBER
};
} // End namespace AMDGPUISD
} // End namespace llvm
#endif
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