forked from OSchip/llvm-project
772 lines
29 KiB
C++
772 lines
29 KiB
C++
//===-- AArch64TargetTransformInfo.cpp - AArch64 specific TTI -------------===//
|
|
//
|
|
// The LLVM Compiler Infrastructure
|
|
//
|
|
// This file is distributed under the University of Illinois Open Source
|
|
// License. See LICENSE.TXT for details.
|
|
//
|
|
//===----------------------------------------------------------------------===//
|
|
|
|
#include "AArch64TargetTransformInfo.h"
|
|
#include "MCTargetDesc/AArch64AddressingModes.h"
|
|
#include "llvm/Analysis/TargetTransformInfo.h"
|
|
#include "llvm/Analysis/LoopInfo.h"
|
|
#include "llvm/CodeGen/BasicTTIImpl.h"
|
|
#include "llvm/Support/Debug.h"
|
|
#include "llvm/Target/CostTable.h"
|
|
#include "llvm/Target/TargetLowering.h"
|
|
#include <algorithm>
|
|
using namespace llvm;
|
|
|
|
#define DEBUG_TYPE "aarch64tti"
|
|
|
|
/// \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.
|
|
int AArch64TTIImpl::getIntImmCost(int64_t Val) {
|
|
// Check if the immediate can be encoded within an instruction.
|
|
if (Val == 0 || AArch64_AM::isLogicalImmediate(Val, 64))
|
|
return 0;
|
|
|
|
if (Val < 0)
|
|
Val = ~Val;
|
|
|
|
// Calculate how many moves we will need to materialize this constant.
|
|
unsigned LZ = countLeadingZeros((uint64_t)Val);
|
|
return (64 - LZ + 15) / 16;
|
|
}
|
|
|
|
/// \brief Calculate the cost of materializing the given constant.
|
|
int AArch64TTIImpl::getIntImmCost(const APInt &Imm, Type *Ty) {
|
|
assert(Ty->isIntegerTy());
|
|
|
|
unsigned BitSize = Ty->getPrimitiveSizeInBits();
|
|
if (BitSize == 0)
|
|
return ~0U;
|
|
|
|
// 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.
|
|
int 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(1, Cost);
|
|
}
|
|
|
|
int AArch64TTIImpl::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.
|
|
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) {
|
|
int NumConstants = (BitSize + 63) / 64;
|
|
int Cost = AArch64TTIImpl::getIntImmCost(Imm, Ty);
|
|
return (Cost <= NumConstants * TTI::TCC_Basic)
|
|
? static_cast<int>(TTI::TCC_Free)
|
|
: Cost;
|
|
}
|
|
return AArch64TTIImpl::getIntImmCost(Imm, Ty);
|
|
}
|
|
|
|
int AArch64TTIImpl::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) {
|
|
int NumConstants = (BitSize + 63) / 64;
|
|
int Cost = AArch64TTIImpl::getIntImmCost(Imm, Ty);
|
|
return (Cost <= NumConstants * TTI::TCC_Basic)
|
|
? static_cast<int>(TTI::TCC_Free)
|
|
: Cost;
|
|
}
|
|
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 AArch64TTIImpl::getIntImmCost(Imm, Ty);
|
|
}
|
|
|
|
TargetTransformInfo::PopcntSupportKind
|
|
AArch64TTIImpl::getPopcntSupport(unsigned TyWidth) {
|
|
assert(isPowerOf2_32(TyWidth) && "Ty width must be power of 2");
|
|
if (TyWidth == 32 || TyWidth == 64)
|
|
return TTI::PSK_FastHardware;
|
|
// TODO: AArch64TargetLowering::LowerCTPOP() supports 128bit popcount.
|
|
return TTI::PSK_Software;
|
|
}
|
|
|
|
bool AArch64TTIImpl::isWideningInstruction(Type *DstTy, unsigned Opcode,
|
|
ArrayRef<const Value *> Args) {
|
|
|
|
// A helper that returns a vector type from the given type. The number of
|
|
// elements in type Ty determine the vector width.
|
|
auto toVectorTy = [&](Type *ArgTy) {
|
|
return VectorType::get(ArgTy->getScalarType(),
|
|
DstTy->getVectorNumElements());
|
|
};
|
|
|
|
// Exit early if DstTy is not a vector type whose elements are at least
|
|
// 16-bits wide.
|
|
if (!DstTy->isVectorTy() || DstTy->getScalarSizeInBits() < 16)
|
|
return false;
|
|
|
|
// Determine if the operation has a widening variant. We consider both the
|
|
// "long" (e.g., usubl) and "wide" (e.g., usubw) versions of the
|
|
// instructions.
|
|
//
|
|
// TODO: Add additional widening operations (e.g., mul, shl, etc.) once we
|
|
// verify that their extending operands are eliminated during code
|
|
// generation.
|
|
switch (Opcode) {
|
|
case Instruction::Add: // UADDL(2), SADDL(2), UADDW(2), SADDW(2).
|
|
case Instruction::Sub: // USUBL(2), SSUBL(2), USUBW(2), SSUBW(2).
|
|
break;
|
|
default:
|
|
return false;
|
|
}
|
|
|
|
// To be a widening instruction (either the "wide" or "long" versions), the
|
|
// second operand must be a sign- or zero extend having a single user. We
|
|
// only consider extends having a single user because they may otherwise not
|
|
// be eliminated.
|
|
if (Args.size() != 2 ||
|
|
(!isa<SExtInst>(Args[1]) && !isa<ZExtInst>(Args[1])) ||
|
|
!Args[1]->hasOneUse())
|
|
return false;
|
|
auto *Extend = cast<CastInst>(Args[1]);
|
|
|
|
// Legalize the destination type and ensure it can be used in a widening
|
|
// operation.
|
|
auto DstTyL = TLI->getTypeLegalizationCost(DL, DstTy);
|
|
unsigned DstElTySize = DstTyL.second.getScalarSizeInBits();
|
|
if (!DstTyL.second.isVector() || DstElTySize != DstTy->getScalarSizeInBits())
|
|
return false;
|
|
|
|
// Legalize the source type and ensure it can be used in a widening
|
|
// operation.
|
|
Type *SrcTy = toVectorTy(Extend->getSrcTy());
|
|
auto SrcTyL = TLI->getTypeLegalizationCost(DL, SrcTy);
|
|
unsigned SrcElTySize = SrcTyL.second.getScalarSizeInBits();
|
|
if (!SrcTyL.second.isVector() || SrcElTySize != SrcTy->getScalarSizeInBits())
|
|
return false;
|
|
|
|
// Get the total number of vector elements in the legalized types.
|
|
unsigned NumDstEls = DstTyL.first * DstTyL.second.getVectorNumElements();
|
|
unsigned NumSrcEls = SrcTyL.first * SrcTyL.second.getVectorNumElements();
|
|
|
|
// Return true if the legalized types have the same number of vector elements
|
|
// and the destination element type size is twice that of the source type.
|
|
return NumDstEls == NumSrcEls && 2 * SrcElTySize == DstElTySize;
|
|
}
|
|
|
|
int AArch64TTIImpl::getCastInstrCost(unsigned Opcode, Type *Dst, Type *Src,
|
|
const Instruction *I) {
|
|
int ISD = TLI->InstructionOpcodeToISD(Opcode);
|
|
assert(ISD && "Invalid opcode");
|
|
|
|
// If the cast is observable, and it is used by a widening instruction (e.g.,
|
|
// uaddl, saddw, etc.), it may be free.
|
|
if (I && I->hasOneUse()) {
|
|
auto *SingleUser = cast<Instruction>(*I->user_begin());
|
|
SmallVector<const Value *, 4> Operands(SingleUser->operand_values());
|
|
if (isWideningInstruction(Dst, SingleUser->getOpcode(), Operands)) {
|
|
// If the cast is the second operand, it is free. We will generate either
|
|
// a "wide" or "long" version of the widening instruction.
|
|
if (I == SingleUser->getOperand(1))
|
|
return 0;
|
|
// If the cast is not the second operand, it will be free if it looks the
|
|
// same as the second operand. In this case, we will generate a "long"
|
|
// version of the widening instruction.
|
|
if (auto *Cast = dyn_cast<CastInst>(SingleUser->getOperand(1)))
|
|
if (I->getOpcode() == Cast->getOpcode() &&
|
|
cast<CastInst>(I)->getSrcTy() == Cast->getSrcTy())
|
|
return 0;
|
|
}
|
|
}
|
|
|
|
EVT SrcTy = TLI->getValueType(DL, Src);
|
|
EVT DstTy = TLI->getValueType(DL, Dst);
|
|
|
|
if (!SrcTy.isSimple() || !DstTy.isSimple())
|
|
return BaseT::getCastInstrCost(Opcode, Dst, Src);
|
|
|
|
static const TypeConversionCostTblEntry
|
|
ConversionTbl[] = {
|
|
{ ISD::TRUNCATE, MVT::v4i16, MVT::v4i32, 1 },
|
|
{ ISD::TRUNCATE, MVT::v4i32, MVT::v4i64, 0 },
|
|
{ ISD::TRUNCATE, MVT::v8i8, MVT::v8i32, 3 },
|
|
{ ISD::TRUNCATE, MVT::v16i8, MVT::v16i32, 6 },
|
|
|
|
// The number of shll instructions for the extension.
|
|
{ ISD::SIGN_EXTEND, MVT::v4i64, MVT::v4i16, 3 },
|
|
{ ISD::ZERO_EXTEND, MVT::v4i64, MVT::v4i16, 3 },
|
|
{ ISD::SIGN_EXTEND, MVT::v4i64, MVT::v4i32, 2 },
|
|
{ ISD::ZERO_EXTEND, MVT::v4i64, MVT::v4i32, 2 },
|
|
{ ISD::SIGN_EXTEND, MVT::v8i32, MVT::v8i8, 3 },
|
|
{ ISD::ZERO_EXTEND, MVT::v8i32, MVT::v8i8, 3 },
|
|
{ ISD::SIGN_EXTEND, MVT::v8i32, MVT::v8i16, 2 },
|
|
{ ISD::ZERO_EXTEND, MVT::v8i32, MVT::v8i16, 2 },
|
|
{ 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::v16i16, MVT::v16i8, 2 },
|
|
{ ISD::ZERO_EXTEND, MVT::v16i16, MVT::v16i8, 2 },
|
|
{ ISD::SIGN_EXTEND, MVT::v16i32, MVT::v16i8, 6 },
|
|
{ ISD::ZERO_EXTEND, MVT::v16i32, MVT::v16i8, 6 },
|
|
|
|
// LowerVectorINT_TO_FP:
|
|
{ ISD::SINT_TO_FP, MVT::v2f32, MVT::v2i32, 1 },
|
|
{ ISD::SINT_TO_FP, MVT::v4f32, MVT::v4i32, 1 },
|
|
{ ISD::SINT_TO_FP, MVT::v2f64, MVT::v2i64, 1 },
|
|
{ ISD::UINT_TO_FP, MVT::v2f32, MVT::v2i32, 1 },
|
|
{ ISD::UINT_TO_FP, MVT::v4f32, MVT::v4i32, 1 },
|
|
{ ISD::UINT_TO_FP, MVT::v2f64, MVT::v2i64, 1 },
|
|
|
|
// Complex: to v2f32
|
|
{ ISD::SINT_TO_FP, MVT::v2f32, MVT::v2i8, 3 },
|
|
{ ISD::SINT_TO_FP, MVT::v2f32, MVT::v2i16, 3 },
|
|
{ ISD::SINT_TO_FP, MVT::v2f32, MVT::v2i64, 2 },
|
|
{ ISD::UINT_TO_FP, MVT::v2f32, MVT::v2i8, 3 },
|
|
{ ISD::UINT_TO_FP, MVT::v2f32, MVT::v2i16, 3 },
|
|
{ ISD::UINT_TO_FP, MVT::v2f32, MVT::v2i64, 2 },
|
|
|
|
// Complex: to v4f32
|
|
{ ISD::SINT_TO_FP, MVT::v4f32, MVT::v4i8, 4 },
|
|
{ ISD::SINT_TO_FP, MVT::v4f32, MVT::v4i16, 2 },
|
|
{ ISD::UINT_TO_FP, MVT::v4f32, MVT::v4i8, 3 },
|
|
{ ISD::UINT_TO_FP, MVT::v4f32, MVT::v4i16, 2 },
|
|
|
|
// Complex: to v8f32
|
|
{ ISD::SINT_TO_FP, MVT::v8f32, MVT::v8i8, 10 },
|
|
{ ISD::SINT_TO_FP, MVT::v8f32, MVT::v8i16, 4 },
|
|
{ ISD::UINT_TO_FP, MVT::v8f32, MVT::v8i8, 10 },
|
|
{ ISD::UINT_TO_FP, MVT::v8f32, MVT::v8i16, 4 },
|
|
|
|
// Complex: to v16f32
|
|
{ ISD::SINT_TO_FP, MVT::v16f32, MVT::v16i8, 21 },
|
|
{ ISD::UINT_TO_FP, MVT::v16f32, MVT::v16i8, 21 },
|
|
|
|
// Complex: to v2f64
|
|
{ ISD::SINT_TO_FP, MVT::v2f64, MVT::v2i8, 4 },
|
|
{ ISD::SINT_TO_FP, MVT::v2f64, MVT::v2i16, 4 },
|
|
{ ISD::SINT_TO_FP, MVT::v2f64, MVT::v2i32, 2 },
|
|
{ ISD::UINT_TO_FP, MVT::v2f64, MVT::v2i8, 4 },
|
|
{ ISD::UINT_TO_FP, MVT::v2f64, MVT::v2i16, 4 },
|
|
{ ISD::UINT_TO_FP, MVT::v2f64, MVT::v2i32, 2 },
|
|
|
|
|
|
// LowerVectorFP_TO_INT
|
|
{ ISD::FP_TO_SINT, MVT::v2i32, MVT::v2f32, 1 },
|
|
{ ISD::FP_TO_SINT, MVT::v4i32, MVT::v4f32, 1 },
|
|
{ ISD::FP_TO_SINT, MVT::v2i64, MVT::v2f64, 1 },
|
|
{ ISD::FP_TO_UINT, MVT::v2i32, MVT::v2f32, 1 },
|
|
{ ISD::FP_TO_UINT, MVT::v4i32, MVT::v4f32, 1 },
|
|
{ ISD::FP_TO_UINT, MVT::v2i64, MVT::v2f64, 1 },
|
|
|
|
// Complex, from v2f32: legal type is v2i32 (no cost) or v2i64 (1 ext).
|
|
{ ISD::FP_TO_SINT, MVT::v2i64, MVT::v2f32, 2 },
|
|
{ ISD::FP_TO_SINT, MVT::v2i16, MVT::v2f32, 1 },
|
|
{ ISD::FP_TO_SINT, MVT::v2i8, MVT::v2f32, 1 },
|
|
{ ISD::FP_TO_UINT, MVT::v2i64, MVT::v2f32, 2 },
|
|
{ ISD::FP_TO_UINT, MVT::v2i16, MVT::v2f32, 1 },
|
|
{ ISD::FP_TO_UINT, MVT::v2i8, MVT::v2f32, 1 },
|
|
|
|
// Complex, from v4f32: legal type is v4i16, 1 narrowing => ~2
|
|
{ ISD::FP_TO_SINT, MVT::v4i16, MVT::v4f32, 2 },
|
|
{ ISD::FP_TO_SINT, MVT::v4i8, MVT::v4f32, 2 },
|
|
{ ISD::FP_TO_UINT, MVT::v4i16, MVT::v4f32, 2 },
|
|
{ ISD::FP_TO_UINT, MVT::v4i8, MVT::v4f32, 2 },
|
|
|
|
// Complex, from v2f64: legal type is v2i32, 1 narrowing => ~2.
|
|
{ ISD::FP_TO_SINT, MVT::v2i32, MVT::v2f64, 2 },
|
|
{ ISD::FP_TO_SINT, MVT::v2i16, MVT::v2f64, 2 },
|
|
{ ISD::FP_TO_SINT, MVT::v2i8, MVT::v2f64, 2 },
|
|
{ ISD::FP_TO_UINT, MVT::v2i32, MVT::v2f64, 2 },
|
|
{ ISD::FP_TO_UINT, MVT::v2i16, MVT::v2f64, 2 },
|
|
{ ISD::FP_TO_UINT, MVT::v2i8, MVT::v2f64, 2 },
|
|
};
|
|
|
|
if (const auto *Entry = ConvertCostTableLookup(ConversionTbl, ISD,
|
|
DstTy.getSimpleVT(),
|
|
SrcTy.getSimpleVT()))
|
|
return Entry->Cost;
|
|
|
|
return BaseT::getCastInstrCost(Opcode, Dst, Src);
|
|
}
|
|
|
|
int AArch64TTIImpl::getExtractWithExtendCost(unsigned Opcode, Type *Dst,
|
|
VectorType *VecTy,
|
|
unsigned Index) {
|
|
|
|
// Make sure we were given a valid extend opcode.
|
|
assert((Opcode == Instruction::SExt || Opcode == Instruction::ZExt) &&
|
|
"Invalid opcode");
|
|
|
|
// We are extending an element we extract from a vector, so the source type
|
|
// of the extend is the element type of the vector.
|
|
auto *Src = VecTy->getElementType();
|
|
|
|
// Sign- and zero-extends are for integer types only.
|
|
assert(isa<IntegerType>(Dst) && isa<IntegerType>(Src) && "Invalid type");
|
|
|
|
// Get the cost for the extract. We compute the cost (if any) for the extend
|
|
// below.
|
|
auto Cost = getVectorInstrCost(Instruction::ExtractElement, VecTy, Index);
|
|
|
|
// Legalize the types.
|
|
auto VecLT = TLI->getTypeLegalizationCost(DL, VecTy);
|
|
auto DstVT = TLI->getValueType(DL, Dst);
|
|
auto SrcVT = TLI->getValueType(DL, Src);
|
|
|
|
// If the resulting type is still a vector and the destination type is legal,
|
|
// we may get the extension for free. If not, get the default cost for the
|
|
// extend.
|
|
if (!VecLT.second.isVector() || !TLI->isTypeLegal(DstVT))
|
|
return Cost + getCastInstrCost(Opcode, Dst, Src);
|
|
|
|
// The destination type should be larger than the element type. If not, get
|
|
// the default cost for the extend.
|
|
if (DstVT.getSizeInBits() < SrcVT.getSizeInBits())
|
|
return Cost + getCastInstrCost(Opcode, Dst, Src);
|
|
|
|
switch (Opcode) {
|
|
default:
|
|
llvm_unreachable("Opcode should be either SExt or ZExt");
|
|
|
|
// For sign-extends, we only need a smov, which performs the extension
|
|
// automatically.
|
|
case Instruction::SExt:
|
|
return Cost;
|
|
|
|
// For zero-extends, the extend is performed automatically by a umov unless
|
|
// the destination type is i64 and the element type is i8 or i16.
|
|
case Instruction::ZExt:
|
|
if (DstVT.getSizeInBits() != 64u || SrcVT.getSizeInBits() == 32u)
|
|
return Cost;
|
|
}
|
|
|
|
// If we are unable to perform the extend for free, get the default cost.
|
|
return Cost + getCastInstrCost(Opcode, Dst, Src);
|
|
}
|
|
|
|
int AArch64TTIImpl::getVectorInstrCost(unsigned Opcode, Type *Val,
|
|
unsigned Index) {
|
|
assert(Val->isVectorTy() && "This must be a vector type");
|
|
|
|
if (Index != -1U) {
|
|
// Legalize the type.
|
|
std::pair<int, 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;
|
|
|
|
// The element at index zero is already inside the vector.
|
|
if (Index == 0)
|
|
return 0;
|
|
}
|
|
|
|
// All other insert/extracts cost this much.
|
|
return ST->getVectorInsertExtractBaseCost();
|
|
}
|
|
|
|
int AArch64TTIImpl::getArithmeticInstrCost(
|
|
unsigned Opcode, Type *Ty, TTI::OperandValueKind Opd1Info,
|
|
TTI::OperandValueKind Opd2Info, TTI::OperandValueProperties Opd1PropInfo,
|
|
TTI::OperandValueProperties Opd2PropInfo, ArrayRef<const Value *> Args) {
|
|
// Legalize the type.
|
|
std::pair<int, MVT> LT = TLI->getTypeLegalizationCost(DL, Ty);
|
|
|
|
// If the instruction is a widening instruction (e.g., uaddl, saddw, etc.),
|
|
// add in the widening overhead specified by the sub-target. Since the
|
|
// extends feeding widening instructions are performed automatically, they
|
|
// aren't present in the generated code and have a zero cost. By adding a
|
|
// widening overhead here, we attach the total cost of the combined operation
|
|
// to the widening instruction.
|
|
int Cost = 0;
|
|
if (isWideningInstruction(Ty, Opcode, Args))
|
|
Cost += ST->getWideningBaseCost();
|
|
|
|
int ISD = TLI->InstructionOpcodeToISD(Opcode);
|
|
|
|
if (ISD == ISD::SDIV &&
|
|
Opd2Info == TargetTransformInfo::OK_UniformConstantValue &&
|
|
Opd2PropInfo == TargetTransformInfo::OP_PowerOf2) {
|
|
// On AArch64, scalar signed division by constants power-of-two are
|
|
// normally expanded to the sequence ADD + CMP + SELECT + SRA.
|
|
// The OperandValue properties many not be same as that of previous
|
|
// operation; conservatively assume OP_None.
|
|
Cost += getArithmeticInstrCost(Instruction::Add, Ty, Opd1Info, Opd2Info,
|
|
TargetTransformInfo::OP_None,
|
|
TargetTransformInfo::OP_None);
|
|
Cost += getArithmeticInstrCost(Instruction::Sub, Ty, Opd1Info, Opd2Info,
|
|
TargetTransformInfo::OP_None,
|
|
TargetTransformInfo::OP_None);
|
|
Cost += getArithmeticInstrCost(Instruction::Select, Ty, Opd1Info, Opd2Info,
|
|
TargetTransformInfo::OP_None,
|
|
TargetTransformInfo::OP_None);
|
|
Cost += getArithmeticInstrCost(Instruction::AShr, Ty, Opd1Info, Opd2Info,
|
|
TargetTransformInfo::OP_None,
|
|
TargetTransformInfo::OP_None);
|
|
return Cost;
|
|
}
|
|
|
|
switch (ISD) {
|
|
default:
|
|
return Cost + BaseT::getArithmeticInstrCost(Opcode, Ty, Opd1Info, Opd2Info,
|
|
Opd1PropInfo, Opd2PropInfo);
|
|
case ISD::ADD:
|
|
case ISD::MUL:
|
|
case ISD::XOR:
|
|
case ISD::OR:
|
|
case ISD::AND:
|
|
// These nodes are marked as 'custom' for combining purposes only.
|
|
// We know that they are legal. See LowerAdd in ISelLowering.
|
|
return (Cost + 1) * LT.first;
|
|
}
|
|
}
|
|
|
|
int AArch64TTIImpl::getAddressComputationCost(Type *Ty, ScalarEvolution *SE,
|
|
const SCEV *Ptr) {
|
|
// 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;
|
|
int MaxMergeDistance = 64;
|
|
|
|
if (Ty->isVectorTy() && SE &&
|
|
!BaseT::isConstantStridedAccessLessThan(SE, Ptr, MaxMergeDistance + 1))
|
|
return NumVectorInstToHideOverhead;
|
|
|
|
// In many cases the address computation is not merged into the instruction
|
|
// addressing mode.
|
|
return 1;
|
|
}
|
|
|
|
int AArch64TTIImpl::getCmpSelInstrCost(unsigned Opcode, Type *ValTy,
|
|
Type *CondTy, const Instruction *I) {
|
|
|
|
int ISD = TLI->InstructionOpcodeToISD(Opcode);
|
|
// We don't lower some vector selects well that are wider than the register
|
|
// width.
|
|
if (ValTy->isVectorTy() && ISD == ISD::SELECT) {
|
|
// We would need this many instructions to hide the scalarization happening.
|
|
const int AmortizationCost = 20;
|
|
static const TypeConversionCostTblEntry
|
|
VectorSelectTbl[] = {
|
|
{ ISD::SELECT, MVT::v16i1, MVT::v16i16, 16 },
|
|
{ ISD::SELECT, MVT::v8i1, MVT::v8i32, 8 },
|
|
{ ISD::SELECT, MVT::v16i1, MVT::v16i32, 16 },
|
|
{ ISD::SELECT, MVT::v4i1, MVT::v4i64, 4 * AmortizationCost },
|
|
{ ISD::SELECT, MVT::v8i1, MVT::v8i64, 8 * AmortizationCost },
|
|
{ ISD::SELECT, MVT::v16i1, MVT::v16i64, 16 * AmortizationCost }
|
|
};
|
|
|
|
EVT SelCondTy = TLI->getValueType(DL, CondTy);
|
|
EVT SelValTy = TLI->getValueType(DL, ValTy);
|
|
if (SelCondTy.isSimple() && SelValTy.isSimple()) {
|
|
if (const auto *Entry = ConvertCostTableLookup(VectorSelectTbl, ISD,
|
|
SelCondTy.getSimpleVT(),
|
|
SelValTy.getSimpleVT()))
|
|
return Entry->Cost;
|
|
}
|
|
}
|
|
return BaseT::getCmpSelInstrCost(Opcode, ValTy, CondTy, I);
|
|
}
|
|
|
|
int AArch64TTIImpl::getMemoryOpCost(unsigned Opcode, Type *Ty,
|
|
unsigned Alignment, unsigned AddressSpace,
|
|
const Instruction *I) {
|
|
auto LT = TLI->getTypeLegalizationCost(DL, Ty);
|
|
|
|
if (ST->isMisaligned128StoreSlow() && Opcode == Instruction::Store &&
|
|
LT.second.is128BitVector() && Alignment < 16) {
|
|
// Unaligned stores are extremely inefficient. We don't split all
|
|
// unaligned 128-bit stores because the negative impact that has shown in
|
|
// practice on inlined block copy code.
|
|
// We make such stores expensive so that we will only vectorize if there
|
|
// are 6 other instructions getting vectorized.
|
|
const int AmortizationCost = 6;
|
|
|
|
return LT.first * 2 * AmortizationCost;
|
|
}
|
|
|
|
if (Ty->isVectorTy() && Ty->getVectorElementType()->isIntegerTy(8) &&
|
|
Ty->getVectorNumElements() < 8) {
|
|
// We scalarize the loads/stores because there is not v.4b register and we
|
|
// have to promote the elements to v.4h.
|
|
unsigned NumVecElts = Ty->getVectorNumElements();
|
|
unsigned NumVectorizableInstsToAmortize = NumVecElts * 2;
|
|
// We generate 2 instructions per vector element.
|
|
return NumVectorizableInstsToAmortize * NumVecElts * 2;
|
|
}
|
|
|
|
return LT.first;
|
|
}
|
|
|
|
int AArch64TTIImpl::getInterleavedMemoryOpCost(unsigned Opcode, Type *VecTy,
|
|
unsigned Factor,
|
|
ArrayRef<unsigned> Indices,
|
|
unsigned Alignment,
|
|
unsigned AddressSpace) {
|
|
assert(Factor >= 2 && "Invalid interleave factor");
|
|
assert(isa<VectorType>(VecTy) && "Expect a vector type");
|
|
|
|
if (Factor <= TLI->getMaxSupportedInterleaveFactor()) {
|
|
unsigned NumElts = VecTy->getVectorNumElements();
|
|
auto *SubVecTy = VectorType::get(VecTy->getScalarType(), NumElts / Factor);
|
|
|
|
// ldN/stN only support legal vector types of size 64 or 128 in bits.
|
|
// Accesses having vector types that are a multiple of 128 bits can be
|
|
// matched to more than one ldN/stN instruction.
|
|
if (NumElts % Factor == 0 &&
|
|
TLI->isLegalInterleavedAccessType(SubVecTy, DL))
|
|
return Factor * TLI->getNumInterleavedAccesses(SubVecTy, DL);
|
|
}
|
|
|
|
return BaseT::getInterleavedMemoryOpCost(Opcode, VecTy, Factor, Indices,
|
|
Alignment, AddressSpace);
|
|
}
|
|
|
|
int AArch64TTIImpl::getCostOfKeepingLiveOverCall(ArrayRef<Type *> Tys) {
|
|
int Cost = 0;
|
|
for (auto *I : Tys) {
|
|
if (!I->isVectorTy())
|
|
continue;
|
|
if (I->getScalarSizeInBits() * I->getVectorNumElements() == 128)
|
|
Cost += getMemoryOpCost(Instruction::Store, I, 128, 0) +
|
|
getMemoryOpCost(Instruction::Load, I, 128, 0);
|
|
}
|
|
return Cost;
|
|
}
|
|
|
|
unsigned AArch64TTIImpl::getMaxInterleaveFactor(unsigned VF) {
|
|
return ST->getMaxInterleaveFactor();
|
|
}
|
|
|
|
void AArch64TTIImpl::getUnrollingPreferences(Loop *L,
|
|
TTI::UnrollingPreferences &UP) {
|
|
// Enable partial unrolling and runtime unrolling.
|
|
BaseT::getUnrollingPreferences(L, UP);
|
|
|
|
// For inner loop, it is more likely to be a hot one, and the runtime check
|
|
// can be promoted out from LICM pass, so the overhead is less, let's try
|
|
// a larger threshold to unroll more loops.
|
|
if (L->getLoopDepth() > 1)
|
|
UP.PartialThreshold *= 2;
|
|
|
|
// Disable partial & runtime unrolling on -Os.
|
|
UP.PartialOptSizeThreshold = 0;
|
|
}
|
|
|
|
Value *AArch64TTIImpl::getOrCreateResultFromMemIntrinsic(IntrinsicInst *Inst,
|
|
Type *ExpectedType) {
|
|
switch (Inst->getIntrinsicID()) {
|
|
default:
|
|
return nullptr;
|
|
case Intrinsic::aarch64_neon_st2:
|
|
case Intrinsic::aarch64_neon_st3:
|
|
case Intrinsic::aarch64_neon_st4: {
|
|
// Create a struct type
|
|
StructType *ST = dyn_cast<StructType>(ExpectedType);
|
|
if (!ST)
|
|
return nullptr;
|
|
unsigned NumElts = Inst->getNumArgOperands() - 1;
|
|
if (ST->getNumElements() != NumElts)
|
|
return nullptr;
|
|
for (unsigned i = 0, e = NumElts; i != e; ++i) {
|
|
if (Inst->getArgOperand(i)->getType() != ST->getElementType(i))
|
|
return nullptr;
|
|
}
|
|
Value *Res = UndefValue::get(ExpectedType);
|
|
IRBuilder<> Builder(Inst);
|
|
for (unsigned i = 0, e = NumElts; i != e; ++i) {
|
|
Value *L = Inst->getArgOperand(i);
|
|
Res = Builder.CreateInsertValue(Res, L, i);
|
|
}
|
|
return Res;
|
|
}
|
|
case Intrinsic::aarch64_neon_ld2:
|
|
case Intrinsic::aarch64_neon_ld3:
|
|
case Intrinsic::aarch64_neon_ld4:
|
|
if (Inst->getType() == ExpectedType)
|
|
return Inst;
|
|
return nullptr;
|
|
}
|
|
}
|
|
|
|
bool AArch64TTIImpl::getTgtMemIntrinsic(IntrinsicInst *Inst,
|
|
MemIntrinsicInfo &Info) {
|
|
switch (Inst->getIntrinsicID()) {
|
|
default:
|
|
break;
|
|
case Intrinsic::aarch64_neon_ld2:
|
|
case Intrinsic::aarch64_neon_ld3:
|
|
case Intrinsic::aarch64_neon_ld4:
|
|
Info.ReadMem = true;
|
|
Info.WriteMem = false;
|
|
Info.PtrVal = Inst->getArgOperand(0);
|
|
break;
|
|
case Intrinsic::aarch64_neon_st2:
|
|
case Intrinsic::aarch64_neon_st3:
|
|
case Intrinsic::aarch64_neon_st4:
|
|
Info.ReadMem = false;
|
|
Info.WriteMem = true;
|
|
Info.PtrVal = Inst->getArgOperand(Inst->getNumArgOperands() - 1);
|
|
break;
|
|
}
|
|
|
|
switch (Inst->getIntrinsicID()) {
|
|
default:
|
|
return false;
|
|
case Intrinsic::aarch64_neon_ld2:
|
|
case Intrinsic::aarch64_neon_st2:
|
|
Info.MatchingId = VECTOR_LDST_TWO_ELEMENTS;
|
|
break;
|
|
case Intrinsic::aarch64_neon_ld3:
|
|
case Intrinsic::aarch64_neon_st3:
|
|
Info.MatchingId = VECTOR_LDST_THREE_ELEMENTS;
|
|
break;
|
|
case Intrinsic::aarch64_neon_ld4:
|
|
case Intrinsic::aarch64_neon_st4:
|
|
Info.MatchingId = VECTOR_LDST_FOUR_ELEMENTS;
|
|
break;
|
|
}
|
|
return true;
|
|
}
|
|
|
|
/// See if \p I should be considered for address type promotion. We check if \p
|
|
/// I is a sext with right type and used in memory accesses. If it used in a
|
|
/// "complex" getelementptr, we allow it to be promoted without finding other
|
|
/// sext instructions that sign extended the same initial value. A getelementptr
|
|
/// is considered as "complex" if it has more than 2 operands.
|
|
bool AArch64TTIImpl::shouldConsiderAddressTypePromotion(
|
|
const Instruction &I, bool &AllowPromotionWithoutCommonHeader) {
|
|
bool Considerable = false;
|
|
AllowPromotionWithoutCommonHeader = false;
|
|
if (!isa<SExtInst>(&I))
|
|
return false;
|
|
Type *ConsideredSExtType =
|
|
Type::getInt64Ty(I.getParent()->getParent()->getContext());
|
|
if (I.getType() != ConsideredSExtType)
|
|
return false;
|
|
// See if the sext is the one with the right type and used in at least one
|
|
// GetElementPtrInst.
|
|
for (const User *U : I.users()) {
|
|
if (const GetElementPtrInst *GEPInst = dyn_cast<GetElementPtrInst>(U)) {
|
|
Considerable = true;
|
|
// A getelementptr is considered as "complex" if it has more than 2
|
|
// operands. We will promote a SExt used in such complex GEP as we
|
|
// expect some computation to be merged if they are done on 64 bits.
|
|
if (GEPInst->getNumOperands() > 2) {
|
|
AllowPromotionWithoutCommonHeader = true;
|
|
break;
|
|
}
|
|
}
|
|
}
|
|
return Considerable;
|
|
}
|
|
|
|
unsigned AArch64TTIImpl::getCacheLineSize() {
|
|
return ST->getCacheLineSize();
|
|
}
|
|
|
|
unsigned AArch64TTIImpl::getPrefetchDistance() {
|
|
return ST->getPrefetchDistance();
|
|
}
|
|
|
|
unsigned AArch64TTIImpl::getMinPrefetchStride() {
|
|
return ST->getMinPrefetchStride();
|
|
}
|
|
|
|
unsigned AArch64TTIImpl::getMaxPrefetchIterationsAhead() {
|
|
return ST->getMaxPrefetchIterationsAhead();
|
|
}
|