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-exception 6 // 7 //===----------------------------------------------------------------------===// 8 // 9 // This file uses the target's specific information to 10 // provide more precise answers to certain TTI queries, while letting the 11 // target independent and default TTI implementations handle the rest. 12 // 13 //===----------------------------------------------------------------------===// 14 15 #ifndef LLVM_LIB_TARGET_BPF_BPFTARGETTRANSFORMINFO_H 16 #define LLVM_LIB_TARGET_BPF_BPFTARGETTRANSFORMINFO_H 17 18 #include "BPFTargetMachine.h" 19 #include "llvm/Analysis/TargetTransformInfo.h" 20 #include "llvm/CodeGen/BasicTTIImpl.h" 21 #include "llvm/Transforms/Utils/ScalarEvolutionExpander.h" 22 23 namespace llvm { 24 class 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 getST()32 const BPFSubtarget *getST() const { return ST; } getTLI()33 const BPFTargetLowering *getTLI() const { return TLI; } 34 35 public: BPFTTIImpl(const BPFTargetMachine * TM,const Function & F)36 explicit BPFTTIImpl(const BPFTargetMachine *TM, const Function &F) 37 : BaseT(TM, F.getDataLayout()), ST(TM->getSubtargetImpl(F)), 38 TLI(ST->getTargetLowering()) {} 39 getIntImmCost(const APInt & Imm,Type * Ty,TTI::TargetCostKind CostKind)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::MemCmpExpansionOptions enableMemCmpExpansion(bool OptSize,bool IsZeroCmp)76 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 getMaxNumArgs()83 unsigned getMaxNumArgs() const override { return 5; } 84 }; 85 86 } // end namespace llvm 87 88 #endif // LLVM_LIB_TARGET_BPF_BPFTARGETTRANSFORMINFO_H 89