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1//===------ BPFTargetTransformInfo.h - BPF specific TTI ---------*- C++ -*-===//2//3// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.4// See https://llvm.org/LICENSE.txt for license information.5// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception6//7//===----------------------------------------------------------------------===//8//9// This file uses the target's specific information to10// provide more precise answers to certain TTI queries, while letting the11// target independent and default TTI implementations handle the rest.12//13//===----------------------------------------------------------------------===//14 15#ifndef LLVM_LIB_TARGET_BPF_BPFTARGETTRANSFORMINFO_H16#define LLVM_LIB_TARGET_BPF_BPFTARGETTRANSFORMINFO_H17 18#include "BPFTargetMachine.h"19#include "llvm/Analysis/TargetTransformInfo.h"20#include "llvm/CodeGen/BasicTTIImpl.h"21#include "llvm/Transforms/Utils/ScalarEvolutionExpander.h"22 23namespace llvm {24class BPFTTIImpl final : public BasicTTIImplBase<BPFTTIImpl> {25 typedef BasicTTIImplBase<BPFTTIImpl> BaseT;26 typedef TargetTransformInfo TTI;27 friend BaseT;28 29 const BPFSubtarget *ST;30 const BPFTargetLowering *TLI;31 32 const BPFSubtarget *getST() const { return ST; }33 const BPFTargetLowering *getTLI() const { return TLI; }34 35public:36 explicit BPFTTIImpl(const BPFTargetMachine *TM, const Function &F)37 : BaseT(TM, F.getDataLayout()), ST(TM->getSubtargetImpl(F)),38 TLI(ST->getTargetLowering()) {}39 40 InstructionCost getIntImmCost(const APInt &Imm, Type *Ty,41 TTI::TargetCostKind CostKind) const override {42 if (Imm.getBitWidth() <= 64 && isInt<32>(Imm.getSExtValue()))43 return TTI::TCC_Free;44 45 return TTI::TCC_Basic;46 }47 48 InstructionCost getCmpSelInstrCost(49 unsigned Opcode, Type *ValTy, Type *CondTy, CmpInst::Predicate VecPred,50 TTI::TargetCostKind CostKind,51 TTI::OperandValueInfo Op1Info = {TTI::OK_AnyValue, TTI::OP_None},52 TTI::OperandValueInfo Op2Info = {TTI::OK_AnyValue, TTI::OP_None},53 const llvm::Instruction *I = nullptr) const override {54 if (Opcode == Instruction::Select)55 return SCEVCheapExpansionBudget.getValue();56 57 return BaseT::getCmpSelInstrCost(Opcode, ValTy, CondTy, VecPred, CostKind,58 Op1Info, Op2Info, I);59 }60 61 InstructionCost getArithmeticInstrCost(62 unsigned Opcode, Type *Ty, TTI::TargetCostKind CostKind,63 TTI::OperandValueInfo Op1Info = {TTI::OK_AnyValue, TTI::OP_None},64 TTI::OperandValueInfo Op2Info = {TTI::OK_AnyValue, TTI::OP_None},65 ArrayRef<const Value *> Args = {},66 const Instruction *CxtI = nullptr) const override {67 int ISD = TLI->InstructionOpcodeToISD(Opcode);68 if (ISD == ISD::ADD && CostKind == TTI::TCK_RecipThroughput)69 return SCEVCheapExpansionBudget.getValue() + 1;70 71 return BaseT::getArithmeticInstrCost(Opcode, Ty, CostKind, Op1Info,72 Op2Info);73 }74 75 TTI::MemCmpExpansionOptions76 enableMemCmpExpansion(bool OptSize, bool IsZeroCmp) const override {77 TTI::MemCmpExpansionOptions Options;78 Options.LoadSizes = {8, 4, 2, 1};79 Options.MaxNumLoads = TLI->getMaxExpandSizeMemcmp(OptSize);80 return Options;81 }82 83 unsigned getMaxNumArgs() const override { return 5; }84};85 86} // end namespace llvm87 88#endif // LLVM_LIB_TARGET_BPF_BPFTARGETTRANSFORMINFO_H89