//===-- ARMTargetTransformInfo.cpp - ARM specific TTI ---------------------===// // // The LLVM Compiler Infrastructure // // This file is distributed under the University of Illinois Open Source // License. See LICENSE.TXT for details. // //===----------------------------------------------------------------------===// #include "ARMTargetTransformInfo.h" #include "llvm/Support/Debug.h" #include "llvm/Target/CostTable.h" #include "llvm/Target/TargetLowering.h" using namespace llvm; #define DEBUG_TYPE "armtti" unsigned ARMTTIImpl::getIntImmCost(const APInt &Imm, Type *Ty) { 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; } 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; } // Thumb1. if (SImmVal >= 0 && SImmVal < 256) return 1; if ((~ZImmVal < 256) || ARM_AM::isThumbImmShiftedVal(ZImmVal)) return 2; // Load from constantpool. return 3; } unsigned ARMTTIImpl::getCastInstrCost(unsigned Opcode, Type *Dst, Type *Src) { int ISD = TLI->InstructionOpcodeToISD(Opcode); assert(ISD && "Invalid opcode"); // Single to/from double precision conversions. static const CostTblEntry 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 LT = TLI->getTypeLegalizationCost(Src); int Idx = CostTableLookup(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 BaseT::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 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 }, // The number of vmovl instructions for the extension. { ISD::SIGN_EXTEND, MVT::v4i64, MVT::v4i16, 3 }, { ISD::ZERO_EXTEND, MVT::v4i64, MVT::v4i16, 3 }, { ISD::SIGN_EXTEND, MVT::v8i32, MVT::v8i8, 3 }, { ISD::ZERO_EXTEND, MVT::v8i32, MVT::v8i8, 3 }, { ISD::SIGN_EXTEND, MVT::v8i64, MVT::v8i8, 7 }, { ISD::ZERO_EXTEND, MVT::v8i64, MVT::v8i8, 7 }, { ISD::SIGN_EXTEND, MVT::v8i64, MVT::v8i16, 6 }, { ISD::ZERO_EXTEND, MVT::v8i64, MVT::v8i16, 6 }, { ISD::SIGN_EXTEND, MVT::v16i32, MVT::v16i8, 6 }, { ISD::ZERO_EXTEND, MVT::v16i32, MVT::v16i8, 6 }, // Operations that we legalize using splitting. { ISD::TRUNCATE, MVT::v16i8, MVT::v16i32, 6 }, { ISD::TRUNCATE, MVT::v8i8, MVT::v8i32, 3 }, // Vector float <-> i32 conversions. { ISD::SINT_TO_FP, MVT::v4f32, MVT::v4i32, 1 }, { ISD::UINT_TO_FP, MVT::v4f32, MVT::v4i32, 1 }, { ISD::SINT_TO_FP, MVT::v2f32, MVT::v2i8, 3 }, { ISD::UINT_TO_FP, MVT::v2f32, MVT::v2i8, 3 }, { ISD::SINT_TO_FP, MVT::v2f32, MVT::v2i16, 2 }, { ISD::UINT_TO_FP, MVT::v2f32, MVT::v2i16, 2 }, { ISD::SINT_TO_FP, MVT::v2f32, MVT::v2i32, 1 }, { ISD::UINT_TO_FP, MVT::v2f32, MVT::v2i32, 1 }, { ISD::SINT_TO_FP, MVT::v4f32, MVT::v4i1, 3 }, { ISD::UINT_TO_FP, MVT::v4f32, MVT::v4i1, 3 }, { ISD::SINT_TO_FP, MVT::v4f32, MVT::v4i8, 3 }, { ISD::UINT_TO_FP, MVT::v4f32, MVT::v4i8, 3 }, { ISD::SINT_TO_FP, MVT::v4f32, MVT::v4i16, 2 }, { ISD::UINT_TO_FP, MVT::v4f32, MVT::v4i16, 2 }, { ISD::SINT_TO_FP, MVT::v8f32, MVT::v8i16, 4 }, { ISD::UINT_TO_FP, MVT::v8f32, MVT::v8i16, 4 }, { ISD::SINT_TO_FP, MVT::v8f32, MVT::v8i32, 2 }, { ISD::UINT_TO_FP, MVT::v8f32, MVT::v8i32, 2 }, { ISD::SINT_TO_FP, MVT::v16f32, MVT::v16i16, 8 }, { ISD::UINT_TO_FP, MVT::v16f32, MVT::v16i16, 8 }, { ISD::SINT_TO_FP, MVT::v16f32, MVT::v16i32, 4 }, { ISD::UINT_TO_FP, MVT::v16f32, MVT::v16i32, 4 }, { ISD::FP_TO_SINT, MVT::v4i32, MVT::v4f32, 1 }, { ISD::FP_TO_UINT, MVT::v4i32, MVT::v4f32, 1 }, { ISD::FP_TO_SINT, MVT::v4i8, MVT::v4f32, 3 }, { ISD::FP_TO_UINT, MVT::v4i8, MVT::v4f32, 3 }, { ISD::FP_TO_SINT, MVT::v4i16, MVT::v4f32, 2 }, { ISD::FP_TO_UINT, MVT::v4i16, MVT::v4f32, 2 }, // Vector double <-> i32 conversions. { ISD::SINT_TO_FP, MVT::v2f64, MVT::v2i32, 2 }, { ISD::UINT_TO_FP, MVT::v2f64, MVT::v2i32, 2 }, { ISD::SINT_TO_FP, MVT::v2f64, MVT::v2i8, 4 }, { ISD::UINT_TO_FP, MVT::v2f64, MVT::v2i8, 4 }, { ISD::SINT_TO_FP, MVT::v2f64, MVT::v2i16, 3 }, { ISD::UINT_TO_FP, MVT::v2f64, MVT::v2i16, 3 }, { 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 }, { ISD::FP_TO_SINT, MVT::v8i16, MVT::v8f32, 4 }, { ISD::FP_TO_UINT, MVT::v8i16, MVT::v8f32, 4 }, { ISD::FP_TO_SINT, MVT::v16i16, MVT::v16f32, 8 }, { ISD::FP_TO_UINT, MVT::v16i16, MVT::v16f32, 8 } }; if (SrcTy.isVector() && ST->hasNEON()) { int Idx = ConvertCostTableLookup(NEONVectorConversionTbl, ISD, DstTy.getSimpleVT(), SrcTy.getSimpleVT()); if (Idx != -1) return NEONVectorConversionTbl[Idx].Cost; } // Scalar float to integer conversions. static const TypeConversionCostTblEntry 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(NEONFloatConversionTbl, ISD, DstTy.getSimpleVT(), SrcTy.getSimpleVT()); if (Idx != -1) return NEONFloatConversionTbl[Idx].Cost; } // Scalar integer to float conversions. static const TypeConversionCostTblEntry 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(NEONIntegerConversionTbl, ISD, DstTy.getSimpleVT(), SrcTy.getSimpleVT()); if (Idx != -1) return NEONIntegerConversionTbl[Idx].Cost; } // Scalar integer conversion costs. static const TypeConversionCostTblEntry 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(ARMIntegerConversionTbl, ISD, DstTy.getSimpleVT(), SrcTy.getSimpleVT()); if (Idx != -1) return ARMIntegerConversionTbl[Idx].Cost; } return BaseT::getCastInstrCost(Opcode, Dst, Src); } unsigned ARMTTIImpl::getVectorInstrCost(unsigned Opcode, Type *ValTy, unsigned Index) { // 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; // Cross-class copies are expensive on many microarchitectures, // so assume they are expensive by default. if ((Opcode == Instruction::InsertElement || Opcode == Instruction::ExtractElement) && ValTy->getVectorElementType()->isIntegerTy()) return 3; return BaseT::getVectorInstrCost(Opcode, ValTy, Index); } unsigned ARMTTIImpl::getCmpSelInstrCost(unsigned Opcode, Type *ValTy, Type *CondTy) { 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 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); if (SelCondTy.isSimple() && SelValTy.isSimple()) { int Idx = ConvertCostTableLookup(NEONVectorSelectTbl, ISD, SelCondTy.getSimpleVT(), SelValTy.getSimpleVT()); if (Idx != -1) return NEONVectorSelectTbl[Idx].Cost; } std::pair LT = TLI->getTypeLegalizationCost(ValTy); return LT.first; } return BaseT::getCmpSelInstrCost(Opcode, ValTy, CondTy); } unsigned ARMTTIImpl::getAddressComputationCost(Type *Ty, bool IsComplex) { // Address computations in vectorized code with non-consecutive addresses will // likely result in more instructions compared to scalar code where the // computation can more often be merged into the index mode. The resulting // extra micro-ops can significantly decrease throughput. unsigned NumVectorInstToHideOverhead = 10; if (Ty->isVectorTy() && IsComplex) return NumVectorInstToHideOverhead; // In many cases the address computation is not merged into the instruction // addressing mode. return 1; } unsigned ARMTTIImpl::getFPOpCost(Type *Ty) { // Use similar logic that's in ARMISelLowering: // Any ARM CPU with VFP2 has floating point, but Thumb1 didn't have access // to VFP. if (ST->hasVFP2() && !ST->isThumb1Only()) { if (Ty->isFloatTy()) { return TargetTransformInfo::TCC_Basic; } if (Ty->isDoubleTy()) { return ST->isFPOnlySP() ? TargetTransformInfo::TCC_Expensive : TargetTransformInfo::TCC_Basic; } } return TargetTransformInfo::TCC_Expensive; } unsigned ARMTTIImpl::getShuffleCost(TTI::ShuffleKind Kind, Type *Tp, int Index, Type *SubTp) { // We only handle costs of reverse and alternate shuffles for now. if (Kind != TTI::SK_Reverse && Kind != TTI::SK_Alternate) return BaseT::getShuffleCost(Kind, Tp, Index, SubTp); if (Kind == TTI::SK_Reverse) { static const CostTblEntry 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 LT = TLI->getTypeLegalizationCost(Tp); int Idx = CostTableLookup(NEONShuffleTbl, ISD::VECTOR_SHUFFLE, LT.second); if (Idx == -1) return BaseT::getShuffleCost(Kind, Tp, Index, SubTp); return LT.first * NEONShuffleTbl[Idx].Cost; } if (Kind == TTI::SK_Alternate) { static const CostTblEntry NEONAltShuffleTbl[] = { // Alt shuffle cost table for ARM. Cost is the number of instructions // required to create the shuffled vector. {ISD::VECTOR_SHUFFLE, MVT::v2f32, 1}, {ISD::VECTOR_SHUFFLE, MVT::v2i64, 1}, {ISD::VECTOR_SHUFFLE, MVT::v2f64, 1}, {ISD::VECTOR_SHUFFLE, MVT::v2i32, 1}, {ISD::VECTOR_SHUFFLE, MVT::v4i32, 2}, {ISD::VECTOR_SHUFFLE, MVT::v4f32, 2}, {ISD::VECTOR_SHUFFLE, MVT::v4i16, 2}, {ISD::VECTOR_SHUFFLE, MVT::v8i16, 16}, {ISD::VECTOR_SHUFFLE, MVT::v16i8, 32}}; std::pair LT = TLI->getTypeLegalizationCost(Tp); int Idx = CostTableLookup(NEONAltShuffleTbl, ISD::VECTOR_SHUFFLE, LT.second); if (Idx == -1) return BaseT::getShuffleCost(Kind, Tp, Index, SubTp); return LT.first * NEONAltShuffleTbl[Idx].Cost; } return BaseT::getShuffleCost(Kind, Tp, Index, SubTp); } unsigned ARMTTIImpl::getArithmeticInstrCost( unsigned Opcode, Type *Ty, TTI::OperandValueKind Op1Info, TTI::OperandValueKind Op2Info, TTI::OperandValueProperties Opd1PropInfo, TTI::OperandValueProperties Opd2PropInfo) { int ISDOpcode = TLI->InstructionOpcodeToISD(Opcode); std::pair LT = TLI->getTypeLegalizationCost(Ty); const unsigned FunctionCallDivCost = 20; const unsigned ReciprocalDivCost = 10; static const CostTblEntry CostTbl[] = { // Division. // These costs are somewhat random. Choose a cost of 20 to indicate that // vectorizing devision (added function call) is going to be very expensive. // Double registers types. { ISD::SDIV, MVT::v1i64, 1 * FunctionCallDivCost}, { ISD::UDIV, MVT::v1i64, 1 * FunctionCallDivCost}, { ISD::SREM, MVT::v1i64, 1 * FunctionCallDivCost}, { ISD::UREM, MVT::v1i64, 1 * FunctionCallDivCost}, { ISD::SDIV, MVT::v2i32, 2 * FunctionCallDivCost}, { ISD::UDIV, MVT::v2i32, 2 * FunctionCallDivCost}, { ISD::SREM, MVT::v2i32, 2 * FunctionCallDivCost}, { ISD::UREM, MVT::v2i32, 2 * FunctionCallDivCost}, { ISD::SDIV, MVT::v4i16, ReciprocalDivCost}, { ISD::UDIV, MVT::v4i16, ReciprocalDivCost}, { ISD::SREM, MVT::v4i16, 4 * FunctionCallDivCost}, { ISD::UREM, MVT::v4i16, 4 * FunctionCallDivCost}, { ISD::SDIV, MVT::v8i8, ReciprocalDivCost}, { ISD::UDIV, MVT::v8i8, ReciprocalDivCost}, { ISD::SREM, MVT::v8i8, 8 * FunctionCallDivCost}, { ISD::UREM, MVT::v8i8, 8 * FunctionCallDivCost}, // Quad register types. { ISD::SDIV, MVT::v2i64, 2 * FunctionCallDivCost}, { ISD::UDIV, MVT::v2i64, 2 * FunctionCallDivCost}, { ISD::SREM, MVT::v2i64, 2 * FunctionCallDivCost}, { ISD::UREM, MVT::v2i64, 2 * FunctionCallDivCost}, { ISD::SDIV, MVT::v4i32, 4 * FunctionCallDivCost}, { ISD::UDIV, MVT::v4i32, 4 * FunctionCallDivCost}, { ISD::SREM, MVT::v4i32, 4 * FunctionCallDivCost}, { ISD::UREM, MVT::v4i32, 4 * FunctionCallDivCost}, { ISD::SDIV, MVT::v8i16, 8 * FunctionCallDivCost}, { ISD::UDIV, MVT::v8i16, 8 * FunctionCallDivCost}, { ISD::SREM, MVT::v8i16, 8 * FunctionCallDivCost}, { ISD::UREM, MVT::v8i16, 8 * FunctionCallDivCost}, { ISD::SDIV, MVT::v16i8, 16 * FunctionCallDivCost}, { ISD::UDIV, MVT::v16i8, 16 * FunctionCallDivCost}, { ISD::SREM, MVT::v16i8, 16 * FunctionCallDivCost}, { ISD::UREM, MVT::v16i8, 16 * FunctionCallDivCost}, // Multiplication. }; int Idx = -1; if (ST->hasNEON()) Idx = CostTableLookup(CostTbl, ISDOpcode, LT.second); if (Idx != -1) return LT.first * CostTbl[Idx].Cost; unsigned Cost = BaseT::getArithmeticInstrCost(Opcode, Ty, Op1Info, Op2Info, Opd1PropInfo, Opd2PropInfo); // This is somewhat of a hack. The problem that we are facing is that SROA // creates a sequence of shift, and, or instructions to construct values. // These sequences are recognized by the ISel and have zero-cost. Not so for // the vectorized code. Because we have support for v2i64 but not i64 those // sequences look particularly beneficial to vectorize. // To work around this we increase the cost of v2i64 operations to make them // seem less beneficial. if (LT.second == MVT::v2i64 && Op2Info == TargetTransformInfo::OK_UniformConstantValue) Cost += 4; return Cost; } unsigned ARMTTIImpl::getMemoryOpCost(unsigned Opcode, Type *Src, unsigned Alignment, unsigned AddressSpace) { std::pair LT = TLI->getTypeLegalizationCost(Src); if (Src->isVectorTy() && Alignment != 16 && Src->getVectorElementType()->isDoubleTy()) { // Unaligned loads/stores are extremely inefficient. // We need 4 uops for vst.1/vld.1 vs 1uop for vldr/vstr. return LT.first * 4; } return LT.first; }