| //===-- X86TargetTransformInfo.cpp - X86 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 |
| /// X86 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. |
| /// |
| //===----------------------------------------------------------------------===// |
| |
| #include "X86TargetTransformInfo.h" |
| #include "llvm/Analysis/TargetTransformInfo.h" |
| #include "llvm/CodeGen/BasicTTIImpl.h" |
| #include "llvm/IR/IntrinsicInst.h" |
| #include "llvm/Support/Debug.h" |
| #include "llvm/Target/CostTable.h" |
| #include "llvm/Target/TargetLowering.h" |
| using namespace llvm; |
| |
| #define DEBUG_TYPE "x86tti" |
| |
| //===----------------------------------------------------------------------===// |
| // |
| // X86 cost model. |
| // |
| //===----------------------------------------------------------------------===// |
| |
| TargetTransformInfo::PopcntSupportKind |
| X86TTIImpl::getPopcntSupport(unsigned TyWidth) { |
| assert(isPowerOf2_32(TyWidth) && "Ty width must be power of 2"); |
| // TODO: Currently the __builtin_popcount() implementation using SSE3 |
| // instructions is inefficient. Once the problem is fixed, we should |
| // call ST->hasSSE3() instead of ST->hasPOPCNT(). |
| return ST->hasPOPCNT() ? TTI::PSK_FastHardware : TTI::PSK_Software; |
| } |
| |
| unsigned X86TTIImpl::getNumberOfRegisters(bool Vector) { |
| if (Vector && !ST->hasSSE1()) |
| return 0; |
| |
| if (ST->is64Bit()) { |
| if (Vector && ST->hasAVX512()) |
| return 32; |
| return 16; |
| } |
| return 8; |
| } |
| |
| unsigned X86TTIImpl::getRegisterBitWidth(bool Vector) { |
| if (Vector) { |
| if (ST->hasAVX512()) return 512; |
| if (ST->hasAVX()) return 256; |
| if (ST->hasSSE1()) return 128; |
| return 0; |
| } |
| |
| if (ST->is64Bit()) |
| return 64; |
| return 32; |
| |
| } |
| |
| unsigned X86TTIImpl::getMaxInterleaveFactor(unsigned VF) { |
| // If the loop will not be vectorized, don't interleave the loop. |
| // Let regular unroll to unroll the loop, which saves the overflow |
| // check and memory check cost. |
| if (VF == 1) |
| return 1; |
| |
| if (ST->isAtom()) |
| return 1; |
| |
| // Sandybridge and Haswell have multiple execution ports and pipelined |
| // vector units. |
| if (ST->hasAVX()) |
| return 4; |
| |
| return 2; |
| } |
| |
| unsigned X86TTIImpl::getArithmeticInstrCost( |
| unsigned Opcode, Type *Ty, TTI::OperandValueKind Op1Info, |
| TTI::OperandValueKind Op2Info, TTI::OperandValueProperties Opd1PropInfo, |
| TTI::OperandValueProperties Opd2PropInfo) { |
| // Legalize the type. |
| std::pair<unsigned, MVT> LT = TLI->getTypeLegalizationCost(DL, Ty); |
| |
| int ISD = TLI->InstructionOpcodeToISD(Opcode); |
| assert(ISD && "Invalid opcode"); |
| |
| if (ISD == ISD::SDIV && |
| Op2Info == TargetTransformInfo::OK_UniformConstantValue && |
| Opd2PropInfo == TargetTransformInfo::OP_PowerOf2) { |
| // On X86, vector signed division by constants power-of-two are |
| // normally expanded to the sequence SRA + SRL + ADD + SRA. |
| // The OperandValue properties many not be same as that of previous |
| // operation;conservatively assume OP_None. |
| unsigned Cost = |
| 2 * getArithmeticInstrCost(Instruction::AShr, Ty, Op1Info, Op2Info, |
| TargetTransformInfo::OP_None, |
| TargetTransformInfo::OP_None); |
| Cost += getArithmeticInstrCost(Instruction::LShr, Ty, Op1Info, Op2Info, |
| TargetTransformInfo::OP_None, |
| TargetTransformInfo::OP_None); |
| Cost += getArithmeticInstrCost(Instruction::Add, Ty, Op1Info, Op2Info, |
| TargetTransformInfo::OP_None, |
| TargetTransformInfo::OP_None); |
| |
| return Cost; |
| } |
| |
| static const CostTblEntry<MVT::SimpleValueType> |
| AVX2UniformConstCostTable[] = { |
| { ISD::SRA, MVT::v4i64, 4 }, // 2 x psrad + shuffle. |
| |
| { ISD::SDIV, MVT::v16i16, 6 }, // vpmulhw sequence |
| { ISD::UDIV, MVT::v16i16, 6 }, // vpmulhuw sequence |
| { ISD::SDIV, MVT::v8i32, 15 }, // vpmuldq sequence |
| { ISD::UDIV, MVT::v8i32, 15 }, // vpmuludq sequence |
| }; |
| |
| if (Op2Info == TargetTransformInfo::OK_UniformConstantValue && |
| ST->hasAVX2()) { |
| int Idx = CostTableLookup(AVX2UniformConstCostTable, ISD, LT.second); |
| if (Idx != -1) |
| return LT.first * AVX2UniformConstCostTable[Idx].Cost; |
| } |
| |
| static const CostTblEntry<MVT::SimpleValueType> AVX512CostTable[] = { |
| { ISD::SHL, MVT::v16i32, 1 }, |
| { ISD::SRL, MVT::v16i32, 1 }, |
| { ISD::SRA, MVT::v16i32, 1 }, |
| { ISD::SHL, MVT::v8i64, 1 }, |
| { ISD::SRL, MVT::v8i64, 1 }, |
| { ISD::SRA, MVT::v8i64, 1 }, |
| }; |
| |
| static const CostTblEntry<MVT::SimpleValueType> AVX2CostTable[] = { |
| // Shifts on v4i64/v8i32 on AVX2 is legal even though we declare to |
| // customize them to detect the cases where shift amount is a scalar one. |
| { ISD::SHL, MVT::v4i32, 1 }, |
| { ISD::SRL, MVT::v4i32, 1 }, |
| { ISD::SRA, MVT::v4i32, 1 }, |
| { ISD::SHL, MVT::v8i32, 1 }, |
| { ISD::SRL, MVT::v8i32, 1 }, |
| { ISD::SRA, MVT::v8i32, 1 }, |
| { ISD::SHL, MVT::v2i64, 1 }, |
| { ISD::SRL, MVT::v2i64, 1 }, |
| { ISD::SHL, MVT::v4i64, 1 }, |
| { ISD::SRL, MVT::v4i64, 1 }, |
| |
| { ISD::SHL, MVT::v32i8, 11 }, // vpblendvb sequence. |
| { ISD::SHL, MVT::v16i16, 10 }, // extend/vpsrlvd/pack sequence. |
| |
| { ISD::SRL, MVT::v32i8, 11 }, // vpblendvb sequence. |
| { ISD::SRL, MVT::v16i16, 10 }, // extend/vpsrlvd/pack sequence. |
| |
| { ISD::SRA, MVT::v32i8, 24 }, // vpblendvb sequence. |
| { ISD::SRA, MVT::v16i16, 10 }, // extend/vpsravd/pack sequence. |
| { ISD::SRA, MVT::v4i64, 4*10 }, // Scalarized. |
| |
| // Vectorizing division is a bad idea. See the SSE2 table for more comments. |
| { ISD::SDIV, MVT::v32i8, 32*20 }, |
| { ISD::SDIV, MVT::v16i16, 16*20 }, |
| { ISD::SDIV, MVT::v8i32, 8*20 }, |
| { ISD::SDIV, MVT::v4i64, 4*20 }, |
| { ISD::UDIV, MVT::v32i8, 32*20 }, |
| { ISD::UDIV, MVT::v16i16, 16*20 }, |
| { ISD::UDIV, MVT::v8i32, 8*20 }, |
| { ISD::UDIV, MVT::v4i64, 4*20 }, |
| }; |
| |
| if (ST->hasAVX512()) { |
| int Idx = CostTableLookup(AVX512CostTable, ISD, LT.second); |
| if (Idx != -1) |
| return LT.first * AVX512CostTable[Idx].Cost; |
| } |
| // Look for AVX2 lowering tricks. |
| if (ST->hasAVX2()) { |
| if (ISD == ISD::SHL && LT.second == MVT::v16i16 && |
| (Op2Info == TargetTransformInfo::OK_UniformConstantValue || |
| Op2Info == TargetTransformInfo::OK_NonUniformConstantValue)) |
| // On AVX2, a packed v16i16 shift left by a constant build_vector |
| // is lowered into a vector multiply (vpmullw). |
| return LT.first; |
| |
| int Idx = CostTableLookup(AVX2CostTable, ISD, LT.second); |
| if (Idx != -1) |
| return LT.first * AVX2CostTable[Idx].Cost; |
| } |
| |
| static const CostTblEntry<MVT::SimpleValueType> |
| SSE2UniformConstCostTable[] = { |
| // We don't correctly identify costs of casts because they are marked as |
| // custom. |
| // Constant splats are cheaper for the following instructions. |
| { ISD::SHL, MVT::v16i8, 1 }, // psllw. |
| { ISD::SHL, MVT::v8i16, 1 }, // psllw. |
| { ISD::SHL, MVT::v4i32, 1 }, // pslld |
| { ISD::SHL, MVT::v2i64, 1 }, // psllq. |
| |
| { ISD::SRL, MVT::v16i8, 1 }, // psrlw. |
| { ISD::SRL, MVT::v8i16, 1 }, // psrlw. |
| { ISD::SRL, MVT::v4i32, 1 }, // psrld. |
| { ISD::SRL, MVT::v2i64, 1 }, // psrlq. |
| |
| { ISD::SRA, MVT::v16i8, 4 }, // psrlw, pand, pxor, psubb. |
| { ISD::SRA, MVT::v8i16, 1 }, // psraw. |
| { ISD::SRA, MVT::v4i32, 1 }, // psrad. |
| { ISD::SRA, MVT::v2i64, 4 }, // 2 x psrad + shuffle. |
| |
| { ISD::SDIV, MVT::v8i16, 6 }, // pmulhw sequence |
| { ISD::UDIV, MVT::v8i16, 6 }, // pmulhuw sequence |
| { ISD::SDIV, MVT::v4i32, 19 }, // pmuludq sequence |
| { ISD::UDIV, MVT::v4i32, 15 }, // pmuludq sequence |
| }; |
| |
| if (Op2Info == TargetTransformInfo::OK_UniformConstantValue && |
| ST->hasSSE2()) { |
| // pmuldq sequence. |
| if (ISD == ISD::SDIV && LT.second == MVT::v4i32 && ST->hasSSE41()) |
| return LT.first * 15; |
| |
| int Idx = CostTableLookup(SSE2UniformConstCostTable, ISD, LT.second); |
| if (Idx != -1) |
| return LT.first * SSE2UniformConstCostTable[Idx].Cost; |
| } |
| |
| if (ISD == ISD::SHL && |
| Op2Info == TargetTransformInfo::OK_NonUniformConstantValue) { |
| EVT VT = LT.second; |
| if ((VT == MVT::v8i16 && ST->hasSSE2()) || |
| (VT == MVT::v4i32 && ST->hasSSE41())) |
| // Vector shift left by non uniform constant can be lowered |
| // into vector multiply (pmullw/pmulld). |
| return LT.first; |
| if (VT == MVT::v4i32 && ST->hasSSE2()) |
| // A vector shift left by non uniform constant is converted |
| // into a vector multiply; the new multiply is eventually |
| // lowered into a sequence of shuffles and 2 x pmuludq. |
| ISD = ISD::MUL; |
| } |
| |
| static const CostTblEntry<MVT::SimpleValueType> SSE2CostTable[] = { |
| // We don't correctly identify costs of casts because they are marked as |
| // custom. |
| // For some cases, where the shift amount is a scalar we would be able |
| // to generate better code. Unfortunately, when this is the case the value |
| // (the splat) will get hoisted out of the loop, thereby making it invisible |
| // to ISel. The cost model must return worst case assumptions because it is |
| // used for vectorization and we don't want to make vectorized code worse |
| // than scalar code. |
| { ISD::SHL, MVT::v16i8, 26 }, // cmpgtb sequence. |
| { ISD::SHL, MVT::v8i16, 32 }, // cmpgtb sequence. |
| { ISD::SHL, MVT::v4i32, 2*5 }, // We optimized this using mul. |
| { ISD::SHL, MVT::v2i64, 2*10 }, // Scalarized. |
| { ISD::SHL, MVT::v4i64, 4*10 }, // Scalarized. |
| |
| { ISD::SRL, MVT::v16i8, 26 }, // cmpgtb sequence. |
| { ISD::SRL, MVT::v8i16, 32 }, // cmpgtb sequence. |
| { ISD::SRL, MVT::v4i32, 16 }, // Shift each lane + blend. |
| { ISD::SRL, MVT::v2i64, 2*10 }, // Scalarized. |
| |
| { ISD::SRA, MVT::v16i8, 54 }, // unpacked cmpgtb sequence. |
| { ISD::SRA, MVT::v8i16, 32 }, // cmpgtb sequence. |
| { ISD::SRA, MVT::v4i32, 16 }, // Shift each lane + blend. |
| { ISD::SRA, MVT::v2i64, 2*10 }, // Scalarized. |
| |
| // It is not a good idea to vectorize division. We have to scalarize it and |
| // in the process we will often end up having to spilling regular |
| // registers. The overhead of division is going to dominate most kernels |
| // anyways so try hard to prevent vectorization of division - it is |
| // generally a bad idea. Assume somewhat arbitrarily that we have to be able |
| // to hide "20 cycles" for each lane. |
| { ISD::SDIV, MVT::v16i8, 16*20 }, |
| { ISD::SDIV, MVT::v8i16, 8*20 }, |
| { ISD::SDIV, MVT::v4i32, 4*20 }, |
| { ISD::SDIV, MVT::v2i64, 2*20 }, |
| { ISD::UDIV, MVT::v16i8, 16*20 }, |
| { ISD::UDIV, MVT::v8i16, 8*20 }, |
| { ISD::UDIV, MVT::v4i32, 4*20 }, |
| { ISD::UDIV, MVT::v2i64, 2*20 }, |
| }; |
| |
| if (ST->hasSSE2()) { |
| int Idx = CostTableLookup(SSE2CostTable, ISD, LT.second); |
| if (Idx != -1) |
| return LT.first * SSE2CostTable[Idx].Cost; |
| } |
| |
| static const CostTblEntry<MVT::SimpleValueType> AVX1CostTable[] = { |
| // We don't have to scalarize unsupported ops. We can issue two half-sized |
| // operations and we only need to extract the upper YMM half. |
| // Two ops + 1 extract + 1 insert = 4. |
| { ISD::MUL, MVT::v16i16, 4 }, |
| { ISD::MUL, MVT::v8i32, 4 }, |
| { ISD::SUB, MVT::v8i32, 4 }, |
| { ISD::ADD, MVT::v8i32, 4 }, |
| { ISD::SUB, MVT::v4i64, 4 }, |
| { ISD::ADD, MVT::v4i64, 4 }, |
| // A v4i64 multiply is custom lowered as two split v2i64 vectors that then |
| // are lowered as a series of long multiplies(3), shifts(4) and adds(2) |
| // Because we believe v4i64 to be a legal type, we must also include the |
| // split factor of two in the cost table. Therefore, the cost here is 18 |
| // instead of 9. |
| { ISD::MUL, MVT::v4i64, 18 }, |
| }; |
| |
| // Look for AVX1 lowering tricks. |
| if (ST->hasAVX() && !ST->hasAVX2()) { |
| EVT VT = LT.second; |
| |
| // v16i16 and v8i32 shifts by non-uniform constants are lowered into a |
| // sequence of extract + two vector multiply + insert. |
| if (ISD == ISD::SHL && (VT == MVT::v8i32 || VT == MVT::v16i16) && |
| Op2Info == TargetTransformInfo::OK_NonUniformConstantValue) |
| ISD = ISD::MUL; |
| |
| int Idx = CostTableLookup(AVX1CostTable, ISD, VT); |
| if (Idx != -1) |
| return LT.first * AVX1CostTable[Idx].Cost; |
| } |
| |
| // Custom lowering of vectors. |
| static const CostTblEntry<MVT::SimpleValueType> CustomLowered[] = { |
| // A v2i64/v4i64 and multiply is custom lowered as a series of long |
| // multiplies(3), shifts(4) and adds(2). |
| { ISD::MUL, MVT::v2i64, 9 }, |
| { ISD::MUL, MVT::v4i64, 9 }, |
| }; |
| int Idx = CostTableLookup(CustomLowered, ISD, LT.second); |
| if (Idx != -1) |
| return LT.first * CustomLowered[Idx].Cost; |
| |
| // Special lowering of v4i32 mul on sse2, sse3: Lower v4i32 mul as 2x shuffle, |
| // 2x pmuludq, 2x shuffle. |
| if (ISD == ISD::MUL && LT.second == MVT::v4i32 && ST->hasSSE2() && |
| !ST->hasSSE41()) |
| return LT.first * 6; |
| |
| // Fallback to the default implementation. |
| return BaseT::getArithmeticInstrCost(Opcode, Ty, Op1Info, Op2Info); |
| } |
| |
| unsigned X86TTIImpl::getShuffleCost(TTI::ShuffleKind Kind, Type *Tp, int Index, |
| Type *SubTp) { |
| // We only estimate the cost of reverse and alternate shuffles. |
| if (Kind != TTI::SK_Reverse && Kind != TTI::SK_Alternate) |
| return BaseT::getShuffleCost(Kind, Tp, Index, SubTp); |
| |
| if (Kind == TTI::SK_Reverse) { |
| std::pair<unsigned, MVT> LT = TLI->getTypeLegalizationCost(DL, Tp); |
| unsigned Cost = 1; |
| if (LT.second.getSizeInBits() > 128) |
| Cost = 3; // Extract + insert + copy. |
| |
| // Multiple by the number of parts. |
| return Cost * LT.first; |
| } |
| |
| if (Kind == TTI::SK_Alternate) { |
| // 64-bit packed float vectors (v2f32) are widened to type v4f32. |
| // 64-bit packed integer vectors (v2i32) are promoted to type v2i64. |
| std::pair<unsigned, MVT> LT = TLI->getTypeLegalizationCost(DL, Tp); |
| |
| // The backend knows how to generate a single VEX.256 version of |
| // instruction VPBLENDW if the target supports AVX2. |
| if (ST->hasAVX2() && LT.second == MVT::v16i16) |
| return LT.first; |
| |
| static const CostTblEntry<MVT::SimpleValueType> AVXAltShuffleTbl[] = { |
| {ISD::VECTOR_SHUFFLE, MVT::v4i64, 1}, // vblendpd |
| {ISD::VECTOR_SHUFFLE, MVT::v4f64, 1}, // vblendpd |
| |
| {ISD::VECTOR_SHUFFLE, MVT::v8i32, 1}, // vblendps |
| {ISD::VECTOR_SHUFFLE, MVT::v8f32, 1}, // vblendps |
| |
| // This shuffle is custom lowered into a sequence of: |
| // 2x vextractf128 , 2x vpblendw , 1x vinsertf128 |
| {ISD::VECTOR_SHUFFLE, MVT::v16i16, 5}, |
| |
| // This shuffle is custom lowered into a long sequence of: |
| // 2x vextractf128 , 4x vpshufb , 2x vpor , 1x vinsertf128 |
| {ISD::VECTOR_SHUFFLE, MVT::v32i8, 9} |
| }; |
| |
| if (ST->hasAVX()) { |
| int Idx = CostTableLookup(AVXAltShuffleTbl, ISD::VECTOR_SHUFFLE, LT.second); |
| if (Idx != -1) |
| return LT.first * AVXAltShuffleTbl[Idx].Cost; |
| } |
| |
| static const CostTblEntry<MVT::SimpleValueType> SSE41AltShuffleTbl[] = { |
| // These are lowered into movsd. |
| {ISD::VECTOR_SHUFFLE, MVT::v2i64, 1}, |
| {ISD::VECTOR_SHUFFLE, MVT::v2f64, 1}, |
| |
| // packed float vectors with four elements are lowered into BLENDI dag |
| // nodes. A v4i32/v4f32 BLENDI generates a single 'blendps'/'blendpd'. |
| {ISD::VECTOR_SHUFFLE, MVT::v4i32, 1}, |
| {ISD::VECTOR_SHUFFLE, MVT::v4f32, 1}, |
| |
| // This shuffle generates a single pshufw. |
| {ISD::VECTOR_SHUFFLE, MVT::v8i16, 1}, |
| |
| // There is no instruction that matches a v16i8 alternate shuffle. |
| // The backend will expand it into the sequence 'pshufb + pshufb + or'. |
| {ISD::VECTOR_SHUFFLE, MVT::v16i8, 3} |
| }; |
| |
| if (ST->hasSSE41()) { |
| int Idx = CostTableLookup(SSE41AltShuffleTbl, ISD::VECTOR_SHUFFLE, LT.second); |
| if (Idx != -1) |
| return LT.first * SSE41AltShuffleTbl[Idx].Cost; |
| } |
| |
| static const CostTblEntry<MVT::SimpleValueType> SSSE3AltShuffleTbl[] = { |
| {ISD::VECTOR_SHUFFLE, MVT::v2i64, 1}, // movsd |
| {ISD::VECTOR_SHUFFLE, MVT::v2f64, 1}, // movsd |
| |
| // SSE3 doesn't have 'blendps'. The following shuffles are expanded into |
| // the sequence 'shufps + pshufd' |
| {ISD::VECTOR_SHUFFLE, MVT::v4i32, 2}, |
| {ISD::VECTOR_SHUFFLE, MVT::v4f32, 2}, |
| |
| {ISD::VECTOR_SHUFFLE, MVT::v8i16, 3}, // pshufb + pshufb + or |
| {ISD::VECTOR_SHUFFLE, MVT::v16i8, 3} // pshufb + pshufb + or |
| }; |
| |
| if (ST->hasSSSE3()) { |
| int Idx = CostTableLookup(SSSE3AltShuffleTbl, ISD::VECTOR_SHUFFLE, LT.second); |
| if (Idx != -1) |
| return LT.first * SSSE3AltShuffleTbl[Idx].Cost; |
| } |
| |
| static const CostTblEntry<MVT::SimpleValueType> SSEAltShuffleTbl[] = { |
| {ISD::VECTOR_SHUFFLE, MVT::v2i64, 1}, // movsd |
| {ISD::VECTOR_SHUFFLE, MVT::v2f64, 1}, // movsd |
| |
| {ISD::VECTOR_SHUFFLE, MVT::v4i32, 2}, // shufps + pshufd |
| {ISD::VECTOR_SHUFFLE, MVT::v4f32, 2}, // shufps + pshufd |
| |
| // This is expanded into a long sequence of four extract + four insert. |
| {ISD::VECTOR_SHUFFLE, MVT::v8i16, 8}, // 4 x pextrw + 4 pinsrw. |
| |
| // 8 x (pinsrw + pextrw + and + movb + movzb + or) |
| {ISD::VECTOR_SHUFFLE, MVT::v16i8, 48} |
| }; |
| |
| // Fall-back (SSE3 and SSE2). |
| int Idx = CostTableLookup(SSEAltShuffleTbl, ISD::VECTOR_SHUFFLE, LT.second); |
| if (Idx != -1) |
| return LT.first * SSEAltShuffleTbl[Idx].Cost; |
| return BaseT::getShuffleCost(Kind, Tp, Index, SubTp); |
| } |
| |
| return BaseT::getShuffleCost(Kind, Tp, Index, SubTp); |
| } |
| |
| unsigned X86TTIImpl::getCastInstrCost(unsigned Opcode, Type *Dst, Type *Src) { |
| int ISD = TLI->InstructionOpcodeToISD(Opcode); |
| assert(ISD && "Invalid opcode"); |
| |
| std::pair<unsigned, MVT> LTSrc = TLI->getTypeLegalizationCost(DL, Src); |
| std::pair<unsigned, MVT> LTDest = TLI->getTypeLegalizationCost(DL, Dst); |
| |
| static const TypeConversionCostTblEntry<MVT::SimpleValueType> |
| SSE2ConvTbl[] = { |
| // These are somewhat magic numbers justified by looking at the output of |
| // Intel's IACA, running some kernels and making sure when we take |
| // legalization into account the throughput will be overestimated. |
| { ISD::UINT_TO_FP, MVT::v2f64, MVT::v2i64, 2*10 }, |
| { ISD::UINT_TO_FP, MVT::v2f64, MVT::v4i32, 4*10 }, |
| { ISD::UINT_TO_FP, MVT::v2f64, MVT::v8i16, 8*10 }, |
| { ISD::UINT_TO_FP, MVT::v2f64, MVT::v16i8, 16*10 }, |
| { ISD::SINT_TO_FP, MVT::v2f64, MVT::v2i64, 2*10 }, |
| { ISD::SINT_TO_FP, MVT::v2f64, MVT::v4i32, 4*10 }, |
| { ISD::SINT_TO_FP, MVT::v2f64, MVT::v8i16, 8*10 }, |
| { ISD::SINT_TO_FP, MVT::v2f64, MVT::v16i8, 16*10 }, |
| // There are faster sequences for float conversions. |
| { ISD::UINT_TO_FP, MVT::v4f32, MVT::v2i64, 15 }, |
| { ISD::UINT_TO_FP, MVT::v4f32, MVT::v4i32, 8 }, |
| { ISD::UINT_TO_FP, MVT::v4f32, MVT::v8i16, 15 }, |
| { ISD::UINT_TO_FP, MVT::v4f32, MVT::v16i8, 8 }, |
| { ISD::SINT_TO_FP, MVT::v4f32, MVT::v2i64, 15 }, |
| { ISD::SINT_TO_FP, MVT::v4f32, MVT::v4i32, 15 }, |
| { ISD::SINT_TO_FP, MVT::v4f32, MVT::v8i16, 15 }, |
| { ISD::SINT_TO_FP, MVT::v4f32, MVT::v16i8, 8 }, |
| }; |
| |
| if (ST->hasSSE2() && !ST->hasAVX()) { |
| int Idx = |
| ConvertCostTableLookup(SSE2ConvTbl, ISD, LTDest.second, LTSrc.second); |
| if (Idx != -1) |
| return LTSrc.first * SSE2ConvTbl[Idx].Cost; |
| } |
| |
| static const TypeConversionCostTblEntry<MVT::SimpleValueType> |
| AVX512ConversionTbl[] = { |
| { ISD::FP_EXTEND, MVT::v8f64, MVT::v8f32, 1 }, |
| { ISD::FP_EXTEND, MVT::v8f64, MVT::v16f32, 3 }, |
| { ISD::FP_ROUND, MVT::v8f32, MVT::v8f64, 1 }, |
| { ISD::FP_ROUND, MVT::v16f32, MVT::v8f64, 3 }, |
| |
| { ISD::TRUNCATE, MVT::v16i8, MVT::v16i32, 1 }, |
| { ISD::TRUNCATE, MVT::v16i16, MVT::v16i32, 1 }, |
| { ISD::TRUNCATE, MVT::v8i16, MVT::v8i64, 1 }, |
| { ISD::TRUNCATE, MVT::v8i32, MVT::v8i64, 1 }, |
| { ISD::TRUNCATE, MVT::v16i32, MVT::v8i64, 4 }, |
| |
| // v16i1 -> v16i32 - load + broadcast |
| { ISD::SIGN_EXTEND, MVT::v16i32, MVT::v16i1, 2 }, |
| { ISD::ZERO_EXTEND, MVT::v16i32, MVT::v16i1, 2 }, |
| |
| { ISD::SIGN_EXTEND, MVT::v16i32, MVT::v16i8, 1 }, |
| { ISD::ZERO_EXTEND, MVT::v16i32, MVT::v16i8, 1 }, |
| { ISD::SIGN_EXTEND, MVT::v16i32, MVT::v16i16, 1 }, |
| { ISD::ZERO_EXTEND, MVT::v16i32, MVT::v16i16, 1 }, |
| { ISD::SIGN_EXTEND, MVT::v8i64, MVT::v16i32, 3 }, |
| { ISD::ZERO_EXTEND, MVT::v8i64, MVT::v16i32, 3 }, |
| |
| { ISD::SINT_TO_FP, MVT::v16f32, MVT::v16i1, 3 }, |
| { ISD::SINT_TO_FP, MVT::v16f32, MVT::v16i8, 2 }, |
| { ISD::SINT_TO_FP, MVT::v16f32, MVT::v16i16, 2 }, |
| { ISD::SINT_TO_FP, MVT::v16f32, MVT::v16i32, 1 }, |
| { ISD::SINT_TO_FP, MVT::v8f64, MVT::v8i1, 4 }, |
| { ISD::SINT_TO_FP, MVT::v8f64, MVT::v8i16, 2 }, |
| { ISD::SINT_TO_FP, MVT::v8f64, MVT::v8i32, 1 }, |
| }; |
| |
| if (ST->hasAVX512()) { |
| int Idx = ConvertCostTableLookup(AVX512ConversionTbl, ISD, LTDest.second, |
| LTSrc.second); |
| if (Idx != -1) |
| return AVX512ConversionTbl[Idx].Cost; |
| } |
| EVT SrcTy = TLI->getValueType(DL, Src); |
| EVT DstTy = TLI->getValueType(DL, Dst); |
| |
| // The function getSimpleVT only handles simple value types. |
| if (!SrcTy.isSimple() || !DstTy.isSimple()) |
| return BaseT::getCastInstrCost(Opcode, Dst, Src); |
| |
| static const TypeConversionCostTblEntry<MVT::SimpleValueType> |
| AVX2ConversionTbl[] = { |
| { ISD::SIGN_EXTEND, MVT::v16i16, MVT::v16i8, 1 }, |
| { ISD::ZERO_EXTEND, MVT::v16i16, MVT::v16i8, 1 }, |
| { ISD::SIGN_EXTEND, MVT::v8i32, MVT::v8i1, 3 }, |
| { ISD::ZERO_EXTEND, MVT::v8i32, MVT::v8i1, 3 }, |
| { ISD::SIGN_EXTEND, MVT::v8i32, MVT::v8i8, 3 }, |
| { ISD::ZERO_EXTEND, MVT::v8i32, MVT::v8i8, 3 }, |
| { ISD::SIGN_EXTEND, MVT::v8i32, MVT::v8i16, 1 }, |
| { ISD::ZERO_EXTEND, MVT::v8i32, MVT::v8i16, 1 }, |
| { ISD::SIGN_EXTEND, MVT::v4i64, MVT::v4i1, 3 }, |
| { ISD::ZERO_EXTEND, MVT::v4i64, MVT::v4i1, 3 }, |
| { ISD::SIGN_EXTEND, MVT::v4i64, MVT::v4i8, 3 }, |
| { ISD::ZERO_EXTEND, MVT::v4i64, MVT::v4i8, 3 }, |
| { ISD::SIGN_EXTEND, MVT::v4i64, MVT::v4i16, 3 }, |
| { ISD::ZERO_EXTEND, MVT::v4i64, MVT::v4i16, 3 }, |
| { ISD::SIGN_EXTEND, MVT::v4i64, MVT::v4i32, 1 }, |
| { ISD::ZERO_EXTEND, MVT::v4i64, MVT::v4i32, 1 }, |
| |
| { ISD::TRUNCATE, MVT::v4i8, MVT::v4i64, 2 }, |
| { ISD::TRUNCATE, MVT::v4i16, MVT::v4i64, 2 }, |
| { ISD::TRUNCATE, MVT::v4i32, MVT::v4i64, 2 }, |
| { ISD::TRUNCATE, MVT::v8i8, MVT::v8i32, 2 }, |
| { ISD::TRUNCATE, MVT::v8i16, MVT::v8i32, 2 }, |
| { ISD::TRUNCATE, MVT::v8i32, MVT::v8i64, 4 }, |
| |
| { ISD::FP_EXTEND, MVT::v8f64, MVT::v8f32, 3 }, |
| { ISD::FP_ROUND, MVT::v8f32, MVT::v8f64, 3 }, |
| |
| { ISD::UINT_TO_FP, MVT::v8f32, MVT::v8i32, 8 }, |
| }; |
| |
| static const TypeConversionCostTblEntry<MVT::SimpleValueType> |
| AVXConversionTbl[] = { |
| { ISD::SIGN_EXTEND, MVT::v16i16, MVT::v16i8, 4 }, |
| { ISD::ZERO_EXTEND, MVT::v16i16, MVT::v16i8, 4 }, |
| { ISD::SIGN_EXTEND, MVT::v8i32, MVT::v8i1, 7 }, |
| { ISD::ZERO_EXTEND, MVT::v8i32, MVT::v8i1, 4 }, |
| { ISD::SIGN_EXTEND, MVT::v8i32, MVT::v8i8, 7 }, |
| { ISD::ZERO_EXTEND, MVT::v8i32, MVT::v8i8, 4 }, |
| { ISD::SIGN_EXTEND, MVT::v8i32, MVT::v8i16, 4 }, |
| { ISD::ZERO_EXTEND, MVT::v8i32, MVT::v8i16, 4 }, |
| { ISD::SIGN_EXTEND, MVT::v4i64, MVT::v4i1, 6 }, |
| { ISD::ZERO_EXTEND, MVT::v4i64, MVT::v4i1, 4 }, |
| { ISD::SIGN_EXTEND, MVT::v4i64, MVT::v4i8, 6 }, |
| { ISD::ZERO_EXTEND, MVT::v4i64, MVT::v4i8, 4 }, |
| { ISD::SIGN_EXTEND, MVT::v4i64, MVT::v4i16, 6 }, |
| { ISD::ZERO_EXTEND, MVT::v4i64, MVT::v4i16, 3 }, |
| { ISD::SIGN_EXTEND, MVT::v4i64, MVT::v4i32, 4 }, |
| { ISD::ZERO_EXTEND, MVT::v4i64, MVT::v4i32, 4 }, |
| |
| { ISD::TRUNCATE, MVT::v4i8, MVT::v4i64, 4 }, |
| { ISD::TRUNCATE, MVT::v4i16, MVT::v4i64, 4 }, |
| { ISD::TRUNCATE, MVT::v4i32, MVT::v4i64, 4 }, |
| { ISD::TRUNCATE, MVT::v8i8, MVT::v8i32, 4 }, |
| { ISD::TRUNCATE, MVT::v8i16, MVT::v8i32, 5 }, |
| { ISD::TRUNCATE, MVT::v16i8, MVT::v16i16, 4 }, |
| { ISD::TRUNCATE, MVT::v8i32, MVT::v8i64, 9 }, |
| |
| { ISD::SINT_TO_FP, MVT::v8f32, MVT::v8i1, 8 }, |
| { ISD::SINT_TO_FP, MVT::v8f32, MVT::v8i8, 8 }, |
| { ISD::SINT_TO_FP, MVT::v8f32, MVT::v8i16, 5 }, |
| { ISD::SINT_TO_FP, MVT::v8f32, MVT::v8i32, 1 }, |
| { ISD::SINT_TO_FP, MVT::v4f32, MVT::v4i1, 3 }, |
| { ISD::SINT_TO_FP, MVT::v4f32, MVT::v4i8, 3 }, |
| { ISD::SINT_TO_FP, MVT::v4f32, MVT::v4i16, 3 }, |
| { ISD::SINT_TO_FP, MVT::v4f32, MVT::v4i32, 1 }, |
| { ISD::SINT_TO_FP, MVT::v4f64, MVT::v4i1, 3 }, |
| { ISD::SINT_TO_FP, MVT::v4f64, MVT::v4i8, 3 }, |
| { ISD::SINT_TO_FP, MVT::v4f64, MVT::v4i16, 3 }, |
| { ISD::SINT_TO_FP, MVT::v4f64, MVT::v4i32, 1 }, |
| |
| { ISD::UINT_TO_FP, MVT::v8f32, MVT::v8i1, 6 }, |
| { ISD::UINT_TO_FP, MVT::v8f32, MVT::v8i8, 5 }, |
| { ISD::UINT_TO_FP, MVT::v8f32, MVT::v8i16, 5 }, |
| { ISD::UINT_TO_FP, MVT::v8f32, MVT::v8i32, 9 }, |
| { ISD::UINT_TO_FP, MVT::v4f32, MVT::v4i1, 7 }, |
| { ISD::UINT_TO_FP, MVT::v4f32, MVT::v4i8, 2 }, |
| { ISD::UINT_TO_FP, MVT::v4f32, MVT::v4i16, 2 }, |
| { ISD::UINT_TO_FP, MVT::v4f32, MVT::v4i32, 6 }, |
| { ISD::UINT_TO_FP, MVT::v4f64, MVT::v4i1, 7 }, |
| { ISD::UINT_TO_FP, MVT::v4f64, MVT::v4i8, 2 }, |
| { ISD::UINT_TO_FP, MVT::v4f64, MVT::v4i16, 2 }, |
| { ISD::UINT_TO_FP, MVT::v4f64, MVT::v4i32, 6 }, |
| // The generic code to compute the scalar overhead is currently broken. |
| // Workaround this limitation by estimating the scalarization overhead |
| // here. We have roughly 10 instructions per scalar element. |
| // Multiply that by the vector width. |
| // FIXME: remove that when PR19268 is fixed. |
| { ISD::UINT_TO_FP, MVT::v2f64, MVT::v2i64, 2*10 }, |
| { ISD::UINT_TO_FP, MVT::v4f64, MVT::v4i64, 4*10 }, |
| |
| { ISD::FP_TO_SINT, MVT::v8i8, MVT::v8f32, 7 }, |
| { ISD::FP_TO_SINT, MVT::v4i8, MVT::v4f32, 1 }, |
| // This node is expanded into scalarized operations but BasicTTI is overly |
| // optimistic estimating its cost. It computes 3 per element (one |
| // vector-extract, one scalar conversion and one vector-insert). The |
| // problem is that the inserts form a read-modify-write chain so latency |
| // should be factored in too. Inflating the cost per element by 1. |
| { ISD::FP_TO_UINT, MVT::v8i32, MVT::v8f32, 8*4 }, |
| { ISD::FP_TO_UINT, MVT::v4i32, MVT::v4f64, 4*4 }, |
| }; |
| |
| if (ST->hasAVX2()) { |
| int Idx = ConvertCostTableLookup(AVX2ConversionTbl, ISD, |
| DstTy.getSimpleVT(), SrcTy.getSimpleVT()); |
| if (Idx != -1) |
| return AVX2ConversionTbl[Idx].Cost; |
| } |
| |
| if (ST->hasAVX()) { |
| int Idx = ConvertCostTableLookup(AVXConversionTbl, ISD, DstTy.getSimpleVT(), |
| SrcTy.getSimpleVT()); |
| if (Idx != -1) |
| return AVXConversionTbl[Idx].Cost; |
| } |
| |
| return BaseT::getCastInstrCost(Opcode, Dst, Src); |
| } |
| |
| unsigned X86TTIImpl::getCmpSelInstrCost(unsigned Opcode, Type *ValTy, |
| Type *CondTy) { |
| // Legalize the type. |
| std::pair<unsigned, MVT> LT = TLI->getTypeLegalizationCost(DL, ValTy); |
| |
| MVT MTy = LT.second; |
| |
| int ISD = TLI->InstructionOpcodeToISD(Opcode); |
| assert(ISD && "Invalid opcode"); |
| |
| static const CostTblEntry<MVT::SimpleValueType> SSE42CostTbl[] = { |
| { ISD::SETCC, MVT::v2f64, 1 }, |
| { ISD::SETCC, MVT::v4f32, 1 }, |
| { ISD::SETCC, MVT::v2i64, 1 }, |
| { ISD::SETCC, MVT::v4i32, 1 }, |
| { ISD::SETCC, MVT::v8i16, 1 }, |
| { ISD::SETCC, MVT::v16i8, 1 }, |
| }; |
| |
| static const CostTblEntry<MVT::SimpleValueType> AVX1CostTbl[] = { |
| { ISD::SETCC, MVT::v4f64, 1 }, |
| { ISD::SETCC, MVT::v8f32, 1 }, |
| // AVX1 does not support 8-wide integer compare. |
| { ISD::SETCC, MVT::v4i64, 4 }, |
| { ISD::SETCC, MVT::v8i32, 4 }, |
| { ISD::SETCC, MVT::v16i16, 4 }, |
| { ISD::SETCC, MVT::v32i8, 4 }, |
| }; |
| |
| static const CostTblEntry<MVT::SimpleValueType> AVX2CostTbl[] = { |
| { ISD::SETCC, MVT::v4i64, 1 }, |
| { ISD::SETCC, MVT::v8i32, 1 }, |
| { ISD::SETCC, MVT::v16i16, 1 }, |
| { ISD::SETCC, MVT::v32i8, 1 }, |
| }; |
| |
| static const CostTblEntry<MVT::SimpleValueType> AVX512CostTbl[] = { |
| { ISD::SETCC, MVT::v8i64, 1 }, |
| { ISD::SETCC, MVT::v16i32, 1 }, |
| { ISD::SETCC, MVT::v8f64, 1 }, |
| { ISD::SETCC, MVT::v16f32, 1 }, |
| }; |
| |
| if (ST->hasAVX512()) { |
| int Idx = CostTableLookup(AVX512CostTbl, ISD, MTy); |
| if (Idx != -1) |
| return LT.first * AVX512CostTbl[Idx].Cost; |
| } |
| |
| if (ST->hasAVX2()) { |
| int Idx = CostTableLookup(AVX2CostTbl, ISD, MTy); |
| if (Idx != -1) |
| return LT.first * AVX2CostTbl[Idx].Cost; |
| } |
| |
| if (ST->hasAVX()) { |
| int Idx = CostTableLookup(AVX1CostTbl, ISD, MTy); |
| if (Idx != -1) |
| return LT.first * AVX1CostTbl[Idx].Cost; |
| } |
| |
| if (ST->hasSSE42()) { |
| int Idx = CostTableLookup(SSE42CostTbl, ISD, MTy); |
| if (Idx != -1) |
| return LT.first * SSE42CostTbl[Idx].Cost; |
| } |
| |
| return BaseT::getCmpSelInstrCost(Opcode, ValTy, CondTy); |
| } |
| |
| unsigned X86TTIImpl::getVectorInstrCost(unsigned Opcode, Type *Val, |
| unsigned Index) { |
| assert(Val->isVectorTy() && "This must be a vector type"); |
| |
| if (Index != -1U) { |
| // Legalize the type. |
| std::pair<unsigned, MVT> LT = TLI->getTypeLegalizationCost(DL, Val); |
| |
| // This type is legalized to a scalar type. |
| if (!LT.second.isVector()) |
| return 0; |
| |
| // The type may be split. Normalize the index to the new type. |
| unsigned Width = LT.second.getVectorNumElements(); |
| Index = Index % Width; |
| |
| // Floating point scalars are already located in index #0. |
| if (Val->getScalarType()->isFloatingPointTy() && Index == 0) |
| return 0; |
| } |
| |
| return BaseT::getVectorInstrCost(Opcode, Val, Index); |
| } |
| |
| unsigned X86TTIImpl::getScalarizationOverhead(Type *Ty, bool Insert, |
| bool Extract) { |
| assert (Ty->isVectorTy() && "Can only scalarize vectors"); |
| unsigned Cost = 0; |
| |
| for (int i = 0, e = Ty->getVectorNumElements(); i < e; ++i) { |
| if (Insert) |
| Cost += getVectorInstrCost(Instruction::InsertElement, Ty, i); |
| if (Extract) |
| Cost += getVectorInstrCost(Instruction::ExtractElement, Ty, i); |
| } |
| |
| return Cost; |
| } |
| |
| unsigned X86TTIImpl::getMemoryOpCost(unsigned Opcode, Type *Src, |
| unsigned Alignment, |
| unsigned AddressSpace) { |
| // Handle non-power-of-two vectors such as <3 x float> |
| if (VectorType *VTy = dyn_cast<VectorType>(Src)) { |
| unsigned NumElem = VTy->getVectorNumElements(); |
| |
| // Handle a few common cases: |
| // <3 x float> |
| if (NumElem == 3 && VTy->getScalarSizeInBits() == 32) |
| // Cost = 64 bit store + extract + 32 bit store. |
| return 3; |
| |
| // <3 x double> |
| if (NumElem == 3 && VTy->getScalarSizeInBits() == 64) |
| // Cost = 128 bit store + unpack + 64 bit store. |
| return 3; |
| |
| // Assume that all other non-power-of-two numbers are scalarized. |
| if (!isPowerOf2_32(NumElem)) { |
| unsigned Cost = BaseT::getMemoryOpCost(Opcode, VTy->getScalarType(), |
| Alignment, AddressSpace); |
| unsigned SplitCost = getScalarizationOverhead(Src, |
| Opcode == Instruction::Load, |
| Opcode==Instruction::Store); |
| return NumElem * Cost + SplitCost; |
| } |
| } |
| |
| // Legalize the type. |
| std::pair<unsigned, MVT> LT = TLI->getTypeLegalizationCost(DL, Src); |
| assert((Opcode == Instruction::Load || Opcode == Instruction::Store) && |
| "Invalid Opcode"); |
| |
| // Each load/store unit costs 1. |
| unsigned Cost = LT.first * 1; |
| |
| // On Sandybridge 256bit load/stores are double pumped |
| // (but not on Haswell). |
| if (LT.second.getSizeInBits() > 128 && !ST->hasAVX2()) |
| Cost*=2; |
| |
| return Cost; |
| } |
| |
| unsigned X86TTIImpl::getMaskedMemoryOpCost(unsigned Opcode, Type *SrcTy, |
| unsigned Alignment, |
| unsigned AddressSpace) { |
| VectorType *SrcVTy = dyn_cast<VectorType>(SrcTy); |
| if (!SrcVTy) |
| // To calculate scalar take the regular cost, without mask |
| return getMemoryOpCost(Opcode, SrcTy, Alignment, AddressSpace); |
| |
| unsigned NumElem = SrcVTy->getVectorNumElements(); |
| VectorType *MaskTy = |
| VectorType::get(Type::getInt8Ty(getGlobalContext()), NumElem); |
| if ((Opcode == Instruction::Load && !isLegalMaskedLoad(SrcVTy, 1)) || |
| (Opcode == Instruction::Store && !isLegalMaskedStore(SrcVTy, 1)) || |
| !isPowerOf2_32(NumElem)) { |
| // Scalarization |
| unsigned MaskSplitCost = getScalarizationOverhead(MaskTy, false, true); |
| unsigned ScalarCompareCost = |
| getCmpSelInstrCost(Instruction::ICmp, |
| Type::getInt8Ty(getGlobalContext()), NULL); |
| unsigned BranchCost = getCFInstrCost(Instruction::Br); |
| unsigned MaskCmpCost = NumElem * (BranchCost + ScalarCompareCost); |
| |
| unsigned ValueSplitCost = |
| getScalarizationOverhead(SrcVTy, Opcode == Instruction::Load, |
| Opcode == Instruction::Store); |
| unsigned MemopCost = |
| NumElem * BaseT::getMemoryOpCost(Opcode, SrcVTy->getScalarType(), |
| Alignment, AddressSpace); |
| return MemopCost + ValueSplitCost + MaskSplitCost + MaskCmpCost; |
| } |
| |
| // Legalize the type. |
| std::pair<unsigned, MVT> LT = TLI->getTypeLegalizationCost(DL, SrcVTy); |
| unsigned Cost = 0; |
| if (LT.second != TLI->getValueType(DL, SrcVTy).getSimpleVT() && |
| LT.second.getVectorNumElements() == NumElem) |
| // Promotion requires expand/truncate for data and a shuffle for mask. |
| Cost += getShuffleCost(TTI::SK_Alternate, SrcVTy, 0, 0) + |
| getShuffleCost(TTI::SK_Alternate, MaskTy, 0, 0); |
| |
| else if (LT.second.getVectorNumElements() > NumElem) { |
| VectorType *NewMaskTy = VectorType::get(MaskTy->getVectorElementType(), |
| LT.second.getVectorNumElements()); |
| // Expanding requires fill mask with zeroes |
| Cost += getShuffleCost(TTI::SK_InsertSubvector, NewMaskTy, 0, MaskTy); |
| } |
| if (!ST->hasAVX512()) |
| return Cost + LT.first*4; // Each maskmov costs 4 |
| |
| // AVX-512 masked load/store is cheapper |
| return Cost+LT.first; |
| } |
| |
| unsigned X86TTIImpl::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; |
| |
| return BaseT::getAddressComputationCost(Ty, IsComplex); |
| } |
| |
| unsigned X86TTIImpl::getReductionCost(unsigned Opcode, Type *ValTy, |
| bool IsPairwise) { |
| |
| std::pair<unsigned, MVT> LT = TLI->getTypeLegalizationCost(DL, ValTy); |
| |
| MVT MTy = LT.second; |
| |
| int ISD = TLI->InstructionOpcodeToISD(Opcode); |
| assert(ISD && "Invalid opcode"); |
| |
| // We use the Intel Architecture Code Analyzer(IACA) to measure the throughput |
| // and make it as the cost. |
| |
| static const CostTblEntry<MVT::SimpleValueType> SSE42CostTblPairWise[] = { |
| { ISD::FADD, MVT::v2f64, 2 }, |
| { ISD::FADD, MVT::v4f32, 4 }, |
| { ISD::ADD, MVT::v2i64, 2 }, // The data reported by the IACA tool is "1.6". |
| { ISD::ADD, MVT::v4i32, 3 }, // The data reported by the IACA tool is "3.5". |
| { ISD::ADD, MVT::v8i16, 5 }, |
| }; |
| |
| static const CostTblEntry<MVT::SimpleValueType> AVX1CostTblPairWise[] = { |
| { ISD::FADD, MVT::v4f32, 4 }, |
| { ISD::FADD, MVT::v4f64, 5 }, |
| { ISD::FADD, MVT::v8f32, 7 }, |
| { ISD::ADD, MVT::v2i64, 1 }, // The data reported by the IACA tool is "1.5". |
| { ISD::ADD, MVT::v4i32, 3 }, // The data reported by the IACA tool is "3.5". |
| { ISD::ADD, MVT::v4i64, 5 }, // The data reported by the IACA tool is "4.8". |
| { ISD::ADD, MVT::v8i16, 5 }, |
| { ISD::ADD, MVT::v8i32, 5 }, |
| }; |
| |
| static const CostTblEntry<MVT::SimpleValueType> SSE42CostTblNoPairWise[] = { |
| { ISD::FADD, MVT::v2f64, 2 }, |
| { ISD::FADD, MVT::v4f32, 4 }, |
| { ISD::ADD, MVT::v2i64, 2 }, // The data reported by the IACA tool is "1.6". |
| { ISD::ADD, MVT::v4i32, 3 }, // The data reported by the IACA tool is "3.3". |
| { ISD::ADD, MVT::v8i16, 4 }, // The data reported by the IACA tool is "4.3". |
| }; |
| |
| static const CostTblEntry<MVT::SimpleValueType> AVX1CostTblNoPairWise[] = { |
| { ISD::FADD, MVT::v4f32, 3 }, |
| { ISD::FADD, MVT::v4f64, 3 }, |
| { ISD::FADD, MVT::v8f32, 4 }, |
| { ISD::ADD, MVT::v2i64, 1 }, // The data reported by the IACA tool is "1.5". |
| { ISD::ADD, MVT::v4i32, 3 }, // The data reported by the IACA tool is "2.8". |
| { ISD::ADD, MVT::v4i64, 3 }, |
| { ISD::ADD, MVT::v8i16, 4 }, |
| { ISD::ADD, MVT::v8i32, 5 }, |
| }; |
| |
| if (IsPairwise) { |
| if (ST->hasAVX()) { |
| int Idx = CostTableLookup(AVX1CostTblPairWise, ISD, MTy); |
| if (Idx != -1) |
| return LT.first * AVX1CostTblPairWise[Idx].Cost; |
| } |
| |
| if (ST->hasSSE42()) { |
| int Idx = CostTableLookup(SSE42CostTblPairWise, ISD, MTy); |
| if (Idx != -1) |
| return LT.first * SSE42CostTblPairWise[Idx].Cost; |
| } |
| } else { |
| if (ST->hasAVX()) { |
| int Idx = CostTableLookup(AVX1CostTblNoPairWise, ISD, MTy); |
| if (Idx != -1) |
| return LT.first * AVX1CostTblNoPairWise[Idx].Cost; |
| } |
| |
| if (ST->hasSSE42()) { |
| int Idx = CostTableLookup(SSE42CostTblNoPairWise, ISD, MTy); |
| if (Idx != -1) |
| return LT.first * SSE42CostTblNoPairWise[Idx].Cost; |
| } |
| } |
| |
| return BaseT::getReductionCost(Opcode, ValTy, IsPairwise); |
| } |
| |
| /// \brief Calculate the cost of materializing a 64-bit value. This helper |
| /// method might only calculate a fraction of a larger immediate. Therefore it |
| /// is valid to return a cost of ZERO. |
| unsigned X86TTIImpl::getIntImmCost(int64_t Val) { |
| if (Val == 0) |
| return TTI::TCC_Free; |
| |
| if (isInt<32>(Val)) |
| return TTI::TCC_Basic; |
| |
| return 2 * TTI::TCC_Basic; |
| } |
| |
| unsigned X86TTIImpl::getIntImmCost(const APInt &Imm, Type *Ty) { |
| assert(Ty->isIntegerTy()); |
| |
| unsigned BitSize = Ty->getPrimitiveSizeInBits(); |
| if (BitSize == 0) |
| return ~0U; |
| |
| // Never hoist constants larger than 128bit, because this might lead to |
| // incorrect code generation or assertions in codegen. |
| // Fixme: Create a cost model for types larger than i128 once the codegen |
| // issues have been fixed. |
| if (BitSize > 128) |
| return TTI::TCC_Free; |
| |
| if (Imm == 0) |
| return TTI::TCC_Free; |
| |
| // Sign-extend all constants to a multiple of 64-bit. |
| APInt ImmVal = Imm; |
| if (BitSize & 0x3f) |
| ImmVal = Imm.sext((BitSize + 63) & ~0x3fU); |
| |
| // Split the constant into 64-bit chunks and calculate the cost for each |
| // chunk. |
| unsigned Cost = 0; |
| for (unsigned ShiftVal = 0; ShiftVal < BitSize; ShiftVal += 64) { |
| APInt Tmp = ImmVal.ashr(ShiftVal).sextOrTrunc(64); |
| int64_t Val = Tmp.getSExtValue(); |
| Cost += getIntImmCost(Val); |
| } |
| // We need at least one instruction to materialze the constant. |
| return std::max(1U, Cost); |
| } |
| |
| unsigned X86TTIImpl::getIntImmCost(unsigned Opcode, unsigned Idx, |
| const APInt &Imm, Type *Ty) { |
| assert(Ty->isIntegerTy()); |
| |
| unsigned BitSize = Ty->getPrimitiveSizeInBits(); |
| // There is no cost model for constants with a bit size of 0. Return TCC_Free |
| // here, so that constant hoisting will ignore this constant. |
| if (BitSize == 0) |
| return TTI::TCC_Free; |
| |
| unsigned ImmIdx = ~0U; |
| switch (Opcode) { |
| default: |
| return TTI::TCC_Free; |
| case Instruction::GetElementPtr: |
| // Always hoist the base address of a GetElementPtr. This prevents the |
| // creation of new constants for every base constant that gets constant |
| // folded with the offset. |
| if (Idx == 0) |
| return 2 * TTI::TCC_Basic; |
| return TTI::TCC_Free; |
| case Instruction::Store: |
| ImmIdx = 0; |
| break; |
| case Instruction::Add: |
| case Instruction::Sub: |
| case Instruction::Mul: |
| case Instruction::UDiv: |
| case Instruction::SDiv: |
| case Instruction::URem: |
| case Instruction::SRem: |
| case Instruction::And: |
| case Instruction::Or: |
| case Instruction::Xor: |
| case Instruction::ICmp: |
| ImmIdx = 1; |
| break; |
| // Always return TCC_Free for the shift value of a shift instruction. |
| case Instruction::Shl: |
| case Instruction::LShr: |
| case Instruction::AShr: |
| if (Idx == 1) |
| return TTI::TCC_Free; |
| break; |
| case Instruction::Trunc: |
| case Instruction::ZExt: |
| case Instruction::SExt: |
| case Instruction::IntToPtr: |
| case Instruction::PtrToInt: |
| case Instruction::BitCast: |
| case Instruction::PHI: |
| case Instruction::Call: |
| case Instruction::Select: |
| case Instruction::Ret: |
| case Instruction::Load: |
| break; |
| } |
| |
| if (Idx == ImmIdx) { |
| unsigned NumConstants = (BitSize + 63) / 64; |
| unsigned Cost = X86TTIImpl::getIntImmCost(Imm, Ty); |
| return (Cost <= NumConstants * TTI::TCC_Basic) |
| ? static_cast<unsigned>(TTI::TCC_Free) |
| : Cost; |
| } |
| |
| return X86TTIImpl::getIntImmCost(Imm, Ty); |
| } |
| |
| unsigned X86TTIImpl::getIntImmCost(Intrinsic::ID IID, unsigned Idx, |
| const APInt &Imm, Type *Ty) { |
| assert(Ty->isIntegerTy()); |
| |
| unsigned BitSize = Ty->getPrimitiveSizeInBits(); |
| // There is no cost model for constants with a bit size of 0. Return TCC_Free |
| // here, so that constant hoisting will ignore this constant. |
| if (BitSize == 0) |
| return TTI::TCC_Free; |
| |
| switch (IID) { |
| default: |
| return TTI::TCC_Free; |
| case Intrinsic::sadd_with_overflow: |
| case Intrinsic::uadd_with_overflow: |
| case Intrinsic::ssub_with_overflow: |
| case Intrinsic::usub_with_overflow: |
| case Intrinsic::smul_with_overflow: |
| case Intrinsic::umul_with_overflow: |
| if ((Idx == 1) && Imm.getBitWidth() <= 64 && isInt<32>(Imm.getSExtValue())) |
| return TTI::TCC_Free; |
| break; |
| case Intrinsic::experimental_stackmap: |
| if ((Idx < 2) || (Imm.getBitWidth() <= 64 && isInt<64>(Imm.getSExtValue()))) |
| return TTI::TCC_Free; |
| break; |
| case Intrinsic::experimental_patchpoint_void: |
| case Intrinsic::experimental_patchpoint_i64: |
| if ((Idx < 4) || (Imm.getBitWidth() <= 64 && isInt<64>(Imm.getSExtValue()))) |
| return TTI::TCC_Free; |
| break; |
| } |
| return X86TTIImpl::getIntImmCost(Imm, Ty); |
| } |
| |
| bool X86TTIImpl::isLegalMaskedLoad(Type *DataTy, int Consecutive) { |
| int DataWidth = DataTy->getPrimitiveSizeInBits(); |
| |
| // Todo: AVX512 allows gather/scatter, works with strided and random as well |
| if ((DataWidth < 32) || (Consecutive == 0)) |
| return false; |
| if (ST->hasAVX512() || ST->hasAVX2()) |
| return true; |
| return false; |
| } |
| |
| bool X86TTIImpl::isLegalMaskedStore(Type *DataType, int Consecutive) { |
| return isLegalMaskedLoad(DataType, Consecutive); |
| } |
| |
| bool X86TTIImpl::hasCompatibleFunctionAttributes(const Function *Caller, |
| const Function *Callee) const { |
| const TargetMachine &TM = getTLI()->getTargetMachine(); |
| |
| // Work this as a subsetting of subtarget features. |
| const FeatureBitset &CallerBits = |
| TM.getSubtargetImpl(*Caller)->getFeatureBits(); |
| const FeatureBitset &CalleeBits = |
| TM.getSubtargetImpl(*Callee)->getFeatureBits(); |
| |
| // FIXME: This is likely too limiting as it will include subtarget features |
| // that we might not care about for inlining, but it is conservatively |
| // correct. |
| return (CallerBits & CalleeBits) == CalleeBits; |
| } |
