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c8018d2237
Make the kind of cost explicit throughout the cost model which, apart from making the cost clear, will allow the generic parts to calculate better costs. It will also allow some backends to approximate and correlate the different costs if they wish. Another benefit is that it will also help simplify the cost model around immediate and intrinsic costs, where we currently have multiple APIs. RFC thread: http://lists.llvm.org/pipermail/llvm-dev/2020-April/141263.html Differential Revision: https://reviews.llvm.org/D79002
114 lines
4.2 KiB
C++
114 lines
4.2 KiB
C++
//===-- LanaiTargetTransformInfo.h - Lanai specific TTI ---------*- C++ -*-===//
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//
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// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
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// See https://llvm.org/LICENSE.txt for license information.
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// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
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//
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//===----------------------------------------------------------------------===//
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//
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// This file a TargetTransformInfo::Concept conforming object specific to the
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// Lanai target machine. It uses the target's detailed information to
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// provide more precise answers to certain TTI queries, while letting the
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// target independent and default TTI implementations handle the rest.
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//
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//===----------------------------------------------------------------------===//
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#ifndef LLVM_LIB_TARGET_LANAI_LANAITARGETTRANSFORMINFO_H
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#define LLVM_LIB_TARGET_LANAI_LANAITARGETTRANSFORMINFO_H
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#include "Lanai.h"
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#include "LanaiSubtarget.h"
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#include "LanaiTargetMachine.h"
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#include "llvm/Analysis/TargetTransformInfo.h"
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#include "llvm/CodeGen/BasicTTIImpl.h"
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#include "llvm/CodeGen/TargetLowering.h"
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#include "llvm/Support/MathExtras.h"
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namespace llvm {
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class LanaiTTIImpl : public BasicTTIImplBase<LanaiTTIImpl> {
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typedef BasicTTIImplBase<LanaiTTIImpl> BaseT;
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typedef TargetTransformInfo TTI;
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friend BaseT;
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const LanaiSubtarget *ST;
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const LanaiTargetLowering *TLI;
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const LanaiSubtarget *getST() const { return ST; }
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const LanaiTargetLowering *getTLI() const { return TLI; }
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public:
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explicit LanaiTTIImpl(const LanaiTargetMachine *TM, const Function &F)
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: BaseT(TM, F.getParent()->getDataLayout()), ST(TM->getSubtargetImpl(F)),
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TLI(ST->getTargetLowering()) {}
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bool shouldBuildLookupTables() const { return false; }
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TargetTransformInfo::PopcntSupportKind getPopcntSupport(unsigned TyWidth) {
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if (TyWidth == 32)
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return TTI::PSK_FastHardware;
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return TTI::PSK_Software;
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}
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int getIntImmCost(const APInt &Imm, Type *Ty, TTI::TargetCostKind CostKind) {
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assert(Ty->isIntegerTy());
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if (Imm == 0)
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return TTI::TCC_Free;
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if (isInt<16>(Imm.getSExtValue()))
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return TTI::TCC_Basic;
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if (isInt<21>(Imm.getZExtValue()))
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return TTI::TCC_Basic;
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if (isInt<32>(Imm.getSExtValue())) {
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if ((Imm.getSExtValue() & 0xFFFF) == 0)
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return TTI::TCC_Basic;
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return 2 * TTI::TCC_Basic;
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}
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return 4 * TTI::TCC_Basic;
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}
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int getIntImmCostInst(unsigned Opc, unsigned Idx, const APInt &Imm, Type *Ty,
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TTI::TargetCostKind CostKind) {
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return getIntImmCost(Imm, Ty, CostKind);
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}
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int getIntImmCostIntrin(Intrinsic::ID IID, unsigned Idx, const APInt &Imm,
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Type *Ty, TTI::TargetCostKind CostKind) {
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return getIntImmCost(Imm, Ty, CostKind);
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}
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unsigned getArithmeticInstrCost(
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unsigned Opcode, Type *Ty,
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TTI::TargetCostKind CostKind = TTI::TCK_RecipThroughput,
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TTI::OperandValueKind Opd1Info = TTI::OK_AnyValue,
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TTI::OperandValueKind Opd2Info = TTI::OK_AnyValue,
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TTI::OperandValueProperties Opd1PropInfo = TTI::OP_None,
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TTI::OperandValueProperties Opd2PropInfo = TTI::OP_None,
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ArrayRef<const Value *> Args = ArrayRef<const Value *>(),
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const Instruction *CxtI = nullptr) {
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int ISD = TLI->InstructionOpcodeToISD(Opcode);
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switch (ISD) {
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default:
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return BaseT::getArithmeticInstrCost(Opcode, Ty, CostKind, Opd1Info,
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Opd2Info,
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Opd1PropInfo, Opd2PropInfo);
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case ISD::MUL:
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case ISD::SDIV:
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case ISD::UDIV:
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case ISD::UREM:
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// This increases the cost associated with multiplication and division
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// to 64 times what the baseline arithmetic cost is. The arithmetic
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// instruction cost was arbitrarily chosen to reduce the desirability
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// of emitting arithmetic instructions that are emulated in software.
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// TODO: Investigate the performance impact given specialized lowerings.
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return 64 * BaseT::getArithmeticInstrCost(Opcode, Ty, CostKind, Opd1Info,
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Opd2Info,
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Opd1PropInfo, Opd2PropInfo);
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}
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}
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};
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} // end namespace llvm
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#endif // LLVM_LIB_TARGET_LANAI_LANAITARGETTRANSFORMINFO_H
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