| //===-- LanaiTargetTransformInfo.h - Lanai specific TTI ---------*- C++ -*-===// |
| // |
| // Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions. |
| // See https://llvm.org/LICENSE.txt for license information. |
| // SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception |
| // |
| //===----------------------------------------------------------------------===// |
| // |
| // This file a TargetTransformInfo::Concept conforming object specific to the |
| // Lanai 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. |
| // |
| //===----------------------------------------------------------------------===// |
| |
| #ifndef LLVM_LIB_TARGET_LANAI_LANAITARGETTRANSFORMINFO_H |
| #define LLVM_LIB_TARGET_LANAI_LANAITARGETTRANSFORMINFO_H |
| |
| #include "Lanai.h" |
| #include "LanaiSubtarget.h" |
| #include "LanaiTargetMachine.h" |
| #include "llvm/Analysis/TargetTransformInfo.h" |
| #include "llvm/CodeGen/BasicTTIImpl.h" |
| #include "llvm/CodeGen/TargetLowering.h" |
| #include "llvm/Support/MathExtras.h" |
| |
| namespace llvm { |
| class LanaiTTIImpl : public BasicTTIImplBase<LanaiTTIImpl> { |
| typedef BasicTTIImplBase<LanaiTTIImpl> BaseT; |
| typedef TargetTransformInfo TTI; |
| friend BaseT; |
| |
| const LanaiSubtarget *ST; |
| const LanaiTargetLowering *TLI; |
| |
| const LanaiSubtarget *getST() const { return ST; } |
| const LanaiTargetLowering *getTLI() const { return TLI; } |
| |
| public: |
| explicit LanaiTTIImpl(const LanaiTargetMachine *TM, const Function &F) |
| : BaseT(TM, F.getParent()->getDataLayout()), ST(TM->getSubtargetImpl(F)), |
| TLI(ST->getTargetLowering()) {} |
| |
| bool shouldBuildLookupTables() const { return false; } |
| |
| TargetTransformInfo::PopcntSupportKind getPopcntSupport(unsigned TyWidth) { |
| if (TyWidth == 32) |
| return TTI::PSK_FastHardware; |
| return TTI::PSK_Software; |
| } |
| |
| InstructionCost getIntImmCost(const APInt &Imm, Type *Ty, |
| TTI::TargetCostKind CostKind) { |
| 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; |
| // No cost model for operations on integers larger than 64 bit implemented |
| // yet. |
| if (BitSize > 64) |
| return TTI::TCC_Free; |
| |
| if (Imm == 0) |
| return TTI::TCC_Free; |
| if (isInt<16>(Imm.getSExtValue())) |
| return TTI::TCC_Basic; |
| if (isInt<21>(Imm.getZExtValue())) |
| return TTI::TCC_Basic; |
| if (isInt<32>(Imm.getSExtValue())) { |
| if ((Imm.getSExtValue() & 0xFFFF) == 0) |
| return TTI::TCC_Basic; |
| return 2 * TTI::TCC_Basic; |
| } |
| |
| return 4 * TTI::TCC_Basic; |
| } |
| |
| InstructionCost getIntImmCostInst(unsigned Opc, unsigned Idx, |
| const APInt &Imm, Type *Ty, |
| TTI::TargetCostKind CostKind, |
| Instruction *Inst = nullptr) { |
| return getIntImmCost(Imm, Ty, CostKind); |
| } |
| |
| InstructionCost getIntImmCostIntrin(Intrinsic::ID IID, unsigned Idx, |
| const APInt &Imm, Type *Ty, |
| TTI::TargetCostKind CostKind) { |
| return getIntImmCost(Imm, Ty, CostKind); |
| } |
| |
| InstructionCost getArithmeticInstrCost( |
| unsigned Opcode, Type *Ty, TTI::TargetCostKind CostKind, |
| TTI::OperandValueKind Opd1Info = TTI::OK_AnyValue, |
| TTI::OperandValueKind Opd2Info = TTI::OK_AnyValue, |
| TTI::OperandValueProperties Opd1PropInfo = TTI::OP_None, |
| TTI::OperandValueProperties Opd2PropInfo = TTI::OP_None, |
| ArrayRef<const Value *> Args = ArrayRef<const Value *>(), |
| const Instruction *CxtI = nullptr) { |
| int ISD = TLI->InstructionOpcodeToISD(Opcode); |
| |
| switch (ISD) { |
| default: |
| return BaseT::getArithmeticInstrCost(Opcode, Ty, CostKind, Opd1Info, |
| Opd2Info, |
| Opd1PropInfo, Opd2PropInfo); |
| case ISD::MUL: |
| case ISD::SDIV: |
| case ISD::UDIV: |
| case ISD::UREM: |
| // This increases the cost associated with multiplication and division |
| // to 64 times what the baseline arithmetic cost is. The arithmetic |
| // instruction cost was arbitrarily chosen to reduce the desirability |
| // of emitting arithmetic instructions that are emulated in software. |
| // TODO: Investigate the performance impact given specialized lowerings. |
| return 64 * BaseT::getArithmeticInstrCost(Opcode, Ty, CostKind, Opd1Info, |
| Opd2Info, |
| Opd1PropInfo, Opd2PropInfo); |
| } |
| } |
| }; |
| |
| } // end namespace llvm |
| |
| #endif // LLVM_LIB_TARGET_LANAI_LANAITARGETTRANSFORMINFO_H |