| //===-- ARMTargetTransformInfo.cpp - ARM specific TTI pass ----------------===// |
| // |
| // The LLVM Compiler Infrastructure |
| // |
| // This file is distributed under the University of Illinois Open Source |
| // License. See LICENSE.TXT for details. |
| // |
| //===----------------------------------------------------------------------===// |
| /// \file |
| /// This file implements a TargetTransformInfo analysis pass specific to the |
| /// ARM target machine. It uses the target's detailed information to provide |
| /// more precise answers to certain TTI queries, while letting the target |
| /// independent and default TTI implementations handle the rest. |
| /// |
| //===----------------------------------------------------------------------===// |
| |
| #define DEBUG_TYPE "armtti" |
| #include "ARM.h" |
| #include "ARMTargetMachine.h" |
| #include "llvm/Analysis/TargetTransformInfo.h" |
| #include "llvm/Support/Debug.h" |
| #include "llvm/Target/TargetLowering.h" |
| #include "llvm/Target/CostTable.h" |
| using namespace llvm; |
| |
| // Declare the pass initialization routine locally as target-specific passes |
| // don't havve a target-wide initialization entry point, and so we rely on the |
| // pass constructor initialization. |
| namespace llvm { |
| void initializeARMTTIPass(PassRegistry &); |
| } |
| |
| namespace { |
| |
| class ARMTTI : public ImmutablePass, public TargetTransformInfo { |
| const ARMBaseTargetMachine *TM; |
| const ARMSubtarget *ST; |
| const ARMTargetLowering *TLI; |
| |
| /// Estimate the overhead of scalarizing an instruction. Insert and Extract |
| /// are set if the result needs to be inserted and/or extracted from vectors. |
| unsigned getScalarizationOverhead(Type *Ty, bool Insert, bool Extract) const; |
| |
| public: |
| ARMTTI() : ImmutablePass(ID), TM(0), ST(0), TLI(0) { |
| llvm_unreachable("This pass cannot be directly constructed"); |
| } |
| |
| ARMTTI(const ARMBaseTargetMachine *TM) |
| : ImmutablePass(ID), TM(TM), ST(TM->getSubtargetImpl()), |
| TLI(TM->getTargetLowering()) { |
| initializeARMTTIPass(*PassRegistry::getPassRegistry()); |
| } |
| |
| virtual void initializePass() { |
| pushTTIStack(this); |
| } |
| |
| virtual void finalizePass() { |
| popTTIStack(); |
| } |
| |
| virtual void getAnalysisUsage(AnalysisUsage &AU) const { |
| TargetTransformInfo::getAnalysisUsage(AU); |
| } |
| |
| /// Pass identification. |
| static char ID; |
| |
| /// Provide necessary pointer adjustments for the two base classes. |
| virtual void *getAdjustedAnalysisPointer(const void *ID) { |
| if (ID == &TargetTransformInfo::ID) |
| return (TargetTransformInfo*)this; |
| return this; |
| } |
| |
| /// \name Scalar TTI Implementations |
| /// @{ |
| |
| virtual unsigned getIntImmCost(const APInt &Imm, Type *Ty) const; |
| |
| /// @} |
| |
| |
| /// \name Vector TTI Implementations |
| /// @{ |
| |
| unsigned getNumberOfRegisters(bool Vector) const { |
| if (Vector) { |
| if (ST->hasNEON()) |
| return 16; |
| return 0; |
| } |
| |
| if (ST->isThumb1Only()) |
| return 8; |
| return 16; |
| } |
| |
| unsigned getRegisterBitWidth(bool Vector) const { |
| if (Vector) { |
| if (ST->hasNEON()) |
| return 128; |
| return 0; |
| } |
| |
| return 32; |
| } |
| |
| unsigned getMaximumUnrollFactor() const { |
| // These are out of order CPUs: |
| if (ST->isCortexA15() || ST->isSwift()) |
| return 2; |
| return 1; |
| } |
| |
| unsigned getShuffleCost(ShuffleKind Kind, Type *Tp, |
| int Index, Type *SubTp) const; |
| |
| unsigned getCastInstrCost(unsigned Opcode, Type *Dst, |
| Type *Src) const; |
| |
| unsigned getCmpSelInstrCost(unsigned Opcode, Type *ValTy, Type *CondTy) const; |
| |
| unsigned getVectorInstrCost(unsigned Opcode, Type *Val, unsigned Index) const; |
| |
| unsigned getAddressComputationCost(Type *Val) const; |
| /// @} |
| }; |
| |
| } // end anonymous namespace |
| |
| INITIALIZE_AG_PASS(ARMTTI, TargetTransformInfo, "armtti", |
| "ARM Target Transform Info", true, true, false) |
| char ARMTTI::ID = 0; |
| |
| ImmutablePass * |
| llvm::createARMTargetTransformInfoPass(const ARMBaseTargetMachine *TM) { |
| return new ARMTTI(TM); |
| } |
| |
| |
| unsigned ARMTTI::getIntImmCost(const APInt &Imm, Type *Ty) const { |
| assert(Ty->isIntegerTy()); |
| |
| unsigned Bits = Ty->getPrimitiveSizeInBits(); |
| if (Bits == 0 || Bits > 32) |
| return 4; |
| |
| int32_t SImmVal = Imm.getSExtValue(); |
| uint32_t ZImmVal = Imm.getZExtValue(); |
| if (!ST->isThumb()) { |
| if ((SImmVal >= 0 && SImmVal < 65536) || |
| (ARM_AM::getSOImmVal(ZImmVal) != -1) || |
| (ARM_AM::getSOImmVal(~ZImmVal) != -1)) |
| return 1; |
| return ST->hasV6T2Ops() ? 2 : 3; |
| } else if (ST->isThumb2()) { |
| if ((SImmVal >= 0 && SImmVal < 65536) || |
| (ARM_AM::getT2SOImmVal(ZImmVal) != -1) || |
| (ARM_AM::getT2SOImmVal(~ZImmVal) != -1)) |
| return 1; |
| return ST->hasV6T2Ops() ? 2 : 3; |
| } else /*Thumb1*/ { |
| if (SImmVal >= 0 && SImmVal < 256) |
| return 1; |
| if ((~ZImmVal < 256) || ARM_AM::isThumbImmShiftedVal(ZImmVal)) |
| return 2; |
| // Load from constantpool. |
| return 3; |
| } |
| return 2; |
| } |
| |
| unsigned ARMTTI::getCastInstrCost(unsigned Opcode, Type *Dst, |
| Type *Src) const { |
| int ISD = TLI->InstructionOpcodeToISD(Opcode); |
| assert(ISD && "Invalid opcode"); |
| |
| // Single to/from double precision conversions. |
| static const CostTblEntry<MVT> NEONFltDblTbl[] = { |
| // Vector fptrunc/fpext conversions. |
| { ISD::FP_ROUND, MVT::v2f64, 2 }, |
| { ISD::FP_EXTEND, MVT::v2f32, 2 }, |
| { ISD::FP_EXTEND, MVT::v4f32, 4 } |
| }; |
| |
| if (Src->isVectorTy() && ST->hasNEON() && (ISD == ISD::FP_ROUND || |
| ISD == ISD::FP_EXTEND)) { |
| std::pair<unsigned, MVT> LT = TLI->getTypeLegalizationCost(Src); |
| int Idx = CostTableLookup<MVT>(NEONFltDblTbl, array_lengthof(NEONFltDblTbl), |
| ISD, LT.second); |
| if (Idx != -1) |
| return LT.first * NEONFltDblTbl[Idx].Cost; |
| } |
| |
| EVT SrcTy = TLI->getValueType(Src); |
| EVT DstTy = TLI->getValueType(Dst); |
| |
| if (!SrcTy.isSimple() || !DstTy.isSimple()) |
| return TargetTransformInfo::getCastInstrCost(Opcode, Dst, Src); |
| |
| // Some arithmetic, load and store operations have specific instructions |
| // to cast up/down their types automatically at no extra cost. |
| // TODO: Get these tables to know at least what the related operations are. |
| static const TypeConversionCostTblEntry<MVT> NEONVectorConversionTbl[] = { |
| { ISD::SIGN_EXTEND, MVT::v4i32, MVT::v4i16, 0 }, |
| { ISD::ZERO_EXTEND, MVT::v4i32, MVT::v4i16, 0 }, |
| { ISD::SIGN_EXTEND, MVT::v2i64, MVT::v2i32, 1 }, |
| { ISD::ZERO_EXTEND, MVT::v2i64, MVT::v2i32, 1 }, |
| { ISD::TRUNCATE, MVT::v4i32, MVT::v4i64, 0 }, |
| { ISD::TRUNCATE, MVT::v4i16, MVT::v4i32, 1 }, |
| |
| // Operations that we legalize using load/stores to the stack. |
| { ISD::SIGN_EXTEND, MVT::v16i32, MVT::v16i8, 16*2 + 4*4 }, |
| { ISD::ZERO_EXTEND, MVT::v16i32, MVT::v16i8, 16*2 + 4*3 }, |
| { ISD::SIGN_EXTEND, MVT::v8i32, MVT::v8i8, 8*2 + 2*4 }, |
| { ISD::ZERO_EXTEND, MVT::v8i32, MVT::v8i8, 8*2 + 2*3 }, |
| { ISD::TRUNCATE, MVT::v16i8, MVT::v16i32, 4*1 + 16*2 + 2*1 }, |
| { ISD::TRUNCATE, MVT::v8i8, MVT::v8i32, 2*1 + 8*2 + 1 }, |
| |
| // Vector float <-> i32 conversions. |
| { ISD::SINT_TO_FP, MVT::v4f32, MVT::v4i32, 1 }, |
| { ISD::UINT_TO_FP, MVT::v4f32, MVT::v4i32, 1 }, |
| { ISD::FP_TO_SINT, MVT::v4i32, MVT::v4f32, 1 }, |
| { ISD::FP_TO_UINT, MVT::v4i32, MVT::v4f32, 1 }, |
| |
| // Vector double <-> i32 conversions. |
| { ISD::SINT_TO_FP, MVT::v2f64, MVT::v2i32, 2 }, |
| { ISD::UINT_TO_FP, MVT::v2f64, MVT::v2i32, 2 }, |
| { ISD::FP_TO_SINT, MVT::v2i32, MVT::v2f64, 2 }, |
| { ISD::FP_TO_UINT, MVT::v2i32, MVT::v2f64, 2 } |
| }; |
| |
| if (SrcTy.isVector() && ST->hasNEON()) { |
| int Idx = ConvertCostTableLookup<MVT>(NEONVectorConversionTbl, |
| array_lengthof(NEONVectorConversionTbl), |
| ISD, DstTy.getSimpleVT(), SrcTy.getSimpleVT()); |
| if (Idx != -1) |
| return NEONVectorConversionTbl[Idx].Cost; |
| } |
| |
| // Scalar float to integer conversions. |
| static const TypeConversionCostTblEntry<MVT> NEONFloatConversionTbl[] = { |
| { ISD::FP_TO_SINT, MVT::i1, MVT::f32, 2 }, |
| { ISD::FP_TO_UINT, MVT::i1, MVT::f32, 2 }, |
| { ISD::FP_TO_SINT, MVT::i1, MVT::f64, 2 }, |
| { ISD::FP_TO_UINT, MVT::i1, MVT::f64, 2 }, |
| { ISD::FP_TO_SINT, MVT::i8, MVT::f32, 2 }, |
| { ISD::FP_TO_UINT, MVT::i8, MVT::f32, 2 }, |
| { ISD::FP_TO_SINT, MVT::i8, MVT::f64, 2 }, |
| { ISD::FP_TO_UINT, MVT::i8, MVT::f64, 2 }, |
| { ISD::FP_TO_SINT, MVT::i16, MVT::f32, 2 }, |
| { ISD::FP_TO_UINT, MVT::i16, MVT::f32, 2 }, |
| { ISD::FP_TO_SINT, MVT::i16, MVT::f64, 2 }, |
| { ISD::FP_TO_UINT, MVT::i16, MVT::f64, 2 }, |
| { ISD::FP_TO_SINT, MVT::i32, MVT::f32, 2 }, |
| { ISD::FP_TO_UINT, MVT::i32, MVT::f32, 2 }, |
| { ISD::FP_TO_SINT, MVT::i32, MVT::f64, 2 }, |
| { ISD::FP_TO_UINT, MVT::i32, MVT::f64, 2 }, |
| { ISD::FP_TO_SINT, MVT::i64, MVT::f32, 10 }, |
| { ISD::FP_TO_UINT, MVT::i64, MVT::f32, 10 }, |
| { ISD::FP_TO_SINT, MVT::i64, MVT::f64, 10 }, |
| { ISD::FP_TO_UINT, MVT::i64, MVT::f64, 10 } |
| }; |
| if (SrcTy.isFloatingPoint() && ST->hasNEON()) { |
| int Idx = ConvertCostTableLookup<MVT>(NEONFloatConversionTbl, |
| array_lengthof(NEONFloatConversionTbl), |
| ISD, DstTy.getSimpleVT(), |
| SrcTy.getSimpleVT()); |
| if (Idx != -1) |
| return NEONFloatConversionTbl[Idx].Cost; |
| } |
| |
| // Scalar integer to float conversions. |
| static const TypeConversionCostTblEntry<MVT> NEONIntegerConversionTbl[] = { |
| { ISD::SINT_TO_FP, MVT::f32, MVT::i1, 2 }, |
| { ISD::UINT_TO_FP, MVT::f32, MVT::i1, 2 }, |
| { ISD::SINT_TO_FP, MVT::f64, MVT::i1, 2 }, |
| { ISD::UINT_TO_FP, MVT::f64, MVT::i1, 2 }, |
| { ISD::SINT_TO_FP, MVT::f32, MVT::i8, 2 }, |
| { ISD::UINT_TO_FP, MVT::f32, MVT::i8, 2 }, |
| { ISD::SINT_TO_FP, MVT::f64, MVT::i8, 2 }, |
| { ISD::UINT_TO_FP, MVT::f64, MVT::i8, 2 }, |
| { ISD::SINT_TO_FP, MVT::f32, MVT::i16, 2 }, |
| { ISD::UINT_TO_FP, MVT::f32, MVT::i16, 2 }, |
| { ISD::SINT_TO_FP, MVT::f64, MVT::i16, 2 }, |
| { ISD::UINT_TO_FP, MVT::f64, MVT::i16, 2 }, |
| { ISD::SINT_TO_FP, MVT::f32, MVT::i32, 2 }, |
| { ISD::UINT_TO_FP, MVT::f32, MVT::i32, 2 }, |
| { ISD::SINT_TO_FP, MVT::f64, MVT::i32, 2 }, |
| { ISD::UINT_TO_FP, MVT::f64, MVT::i32, 2 }, |
| { ISD::SINT_TO_FP, MVT::f32, MVT::i64, 10 }, |
| { ISD::UINT_TO_FP, MVT::f32, MVT::i64, 10 }, |
| { ISD::SINT_TO_FP, MVT::f64, MVT::i64, 10 }, |
| { ISD::UINT_TO_FP, MVT::f64, MVT::i64, 10 } |
| }; |
| |
| if (SrcTy.isInteger() && ST->hasNEON()) { |
| int Idx = ConvertCostTableLookup<MVT>(NEONIntegerConversionTbl, |
| array_lengthof(NEONIntegerConversionTbl), |
| ISD, DstTy.getSimpleVT(), |
| SrcTy.getSimpleVT()); |
| if (Idx != -1) |
| return NEONIntegerConversionTbl[Idx].Cost; |
| } |
| |
| // Scalar integer conversion costs. |
| static const TypeConversionCostTblEntry<MVT> ARMIntegerConversionTbl[] = { |
| // i16 -> i64 requires two dependent operations. |
| { ISD::SIGN_EXTEND, MVT::i64, MVT::i16, 2 }, |
| |
| // Truncates on i64 are assumed to be free. |
| { ISD::TRUNCATE, MVT::i32, MVT::i64, 0 }, |
| { ISD::TRUNCATE, MVT::i16, MVT::i64, 0 }, |
| { ISD::TRUNCATE, MVT::i8, MVT::i64, 0 }, |
| { ISD::TRUNCATE, MVT::i1, MVT::i64, 0 } |
| }; |
| |
| if (SrcTy.isInteger()) { |
| int Idx = |
| ConvertCostTableLookup<MVT>(ARMIntegerConversionTbl, |
| array_lengthof(ARMIntegerConversionTbl), |
| ISD, DstTy.getSimpleVT(), |
| SrcTy.getSimpleVT()); |
| if (Idx != -1) |
| return ARMIntegerConversionTbl[Idx].Cost; |
| } |
| |
| return TargetTransformInfo::getCastInstrCost(Opcode, Dst, Src); |
| } |
| |
| unsigned ARMTTI::getVectorInstrCost(unsigned Opcode, Type *ValTy, |
| unsigned Index) const { |
| // Penalize inserting into an D-subregister. We end up with a three times |
| // lower estimated throughput on swift. |
| if (ST->isSwift() && |
| Opcode == Instruction::InsertElement && |
| ValTy->isVectorTy() && |
| ValTy->getScalarSizeInBits() <= 32) |
| return 3; |
| |
| return TargetTransformInfo::getVectorInstrCost(Opcode, ValTy, Index); |
| } |
| |
| unsigned ARMTTI::getCmpSelInstrCost(unsigned Opcode, Type *ValTy, |
| Type *CondTy) const { |
| |
| int ISD = TLI->InstructionOpcodeToISD(Opcode); |
| // On NEON a a vector select gets lowered to vbsl. |
| if (ST->hasNEON() && ValTy->isVectorTy() && ISD == ISD::SELECT) { |
| // Lowering of some vector selects is currently far from perfect. |
| static const TypeConversionCostTblEntry<MVT> NEONVectorSelectTbl[] = { |
| { ISD::SELECT, MVT::v16i1, MVT::v16i16, 2*16 + 1 + 3*1 + 4*1 }, |
| { ISD::SELECT, MVT::v8i1, MVT::v8i32, 4*8 + 1*3 + 1*4 + 1*2 }, |
| { ISD::SELECT, MVT::v16i1, MVT::v16i32, 4*16 + 1*6 + 1*8 + 1*4 }, |
| { ISD::SELECT, MVT::v4i1, MVT::v4i64, 4*4 + 1*2 + 1 }, |
| { ISD::SELECT, MVT::v8i1, MVT::v8i64, 50 }, |
| { ISD::SELECT, MVT::v16i1, MVT::v16i64, 100 } |
| }; |
| |
| EVT SelCondTy = TLI->getValueType(CondTy); |
| EVT SelValTy = TLI->getValueType(ValTy); |
| int Idx = ConvertCostTableLookup<MVT>(NEONVectorSelectTbl, |
| array_lengthof(NEONVectorSelectTbl), |
| ISD, SelCondTy.getSimpleVT(), |
| SelValTy.getSimpleVT()); |
| if (Idx != -1) |
| return NEONVectorSelectTbl[Idx].Cost; |
| |
| std::pair<unsigned, MVT> LT = TLI->getTypeLegalizationCost(ValTy); |
| return LT.first; |
| } |
| |
| return TargetTransformInfo::getCmpSelInstrCost(Opcode, ValTy, CondTy); |
| } |
| |
| unsigned ARMTTI::getAddressComputationCost(Type *Ty) const { |
| // In many cases the address computation is not merged into the instruction |
| // addressing mode. |
| return 1; |
| } |
| |
| unsigned ARMTTI::getShuffleCost(ShuffleKind Kind, Type *Tp, int Index, |
| Type *SubTp) const { |
| // We only handle costs of reverse shuffles for now. |
| if (Kind != SK_Reverse) |
| return TargetTransformInfo::getShuffleCost(Kind, Tp, Index, SubTp); |
| |
| static const CostTblEntry<MVT> NEONShuffleTbl[] = { |
| // Reverse shuffle cost one instruction if we are shuffling within a double |
| // word (vrev) or two if we shuffle a quad word (vrev, vext). |
| { ISD::VECTOR_SHUFFLE, MVT::v2i32, 1 }, |
| { ISD::VECTOR_SHUFFLE, MVT::v2f32, 1 }, |
| { ISD::VECTOR_SHUFFLE, MVT::v2i64, 1 }, |
| { ISD::VECTOR_SHUFFLE, MVT::v2f64, 1 }, |
| |
| { ISD::VECTOR_SHUFFLE, MVT::v4i32, 2 }, |
| { ISD::VECTOR_SHUFFLE, MVT::v4f32, 2 }, |
| { ISD::VECTOR_SHUFFLE, MVT::v8i16, 2 }, |
| { ISD::VECTOR_SHUFFLE, MVT::v16i8, 2 } |
| }; |
| |
| std::pair<unsigned, MVT> LT = TLI->getTypeLegalizationCost(Tp); |
| |
| int Idx = CostTableLookup<MVT>(NEONShuffleTbl, array_lengthof(NEONShuffleTbl), |
| ISD::VECTOR_SHUFFLE, LT.second); |
| if (Idx == -1) |
| return TargetTransformInfo::getShuffleCost(Kind, Tp, Index, SubTp); |
| |
| return LT.first * NEONShuffleTbl[Idx].Cost; |
| } |
