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 : 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 35 public: 36 explicit BPFTTIImpl(const BPFTargetMachine *TM, const Function &F) 37 : BaseT(TM, F.getParent()->getDataLayout()), ST(TM->getSubtargetImpl(F)), 38 TLI(ST->getTargetLowering()) {} 39 40 int getIntImmCost(const APInt &Imm, Type *Ty, TTI::TargetCostKind CostKind) { 41 if (Imm.getBitWidth() <= 64 && isInt<32>(Imm.getSExtValue())) 42 return TTI::TCC_Free; 43 44 return TTI::TCC_Basic; 45 } 46 47 InstructionCost getCmpSelInstrCost(unsigned Opcode, Type *ValTy, Type *CondTy, 48 CmpInst::Predicate VecPred, 49 TTI::TargetCostKind CostKind, 50 const llvm::Instruction *I = nullptr) { 51 if (Opcode == Instruction::Select) 52 return SCEVCheapExpansionBudget.getValue(); 53 54 return BaseT::getCmpSelInstrCost(Opcode, ValTy, CondTy, VecPred, CostKind, 55 I); 56 } 57 58 InstructionCost getArithmeticInstrCost( 59 unsigned Opcode, Type *Ty, TTI::TargetCostKind CostKind, 60 TTI::OperandValueInfo Op1Info = {TTI::OK_AnyValue, TTI::OP_None}, 61 TTI::OperandValueInfo Op2Info = {TTI::OK_AnyValue, TTI::OP_None}, 62 ArrayRef<const Value *> Args = ArrayRef<const Value *>(), 63 const Instruction *CxtI = nullptr) { 64 int ISD = TLI->InstructionOpcodeToISD(Opcode); 65 if (ISD == ISD::ADD && CostKind == TTI::TCK_RecipThroughput) 66 return SCEVCheapExpansionBudget.getValue() + 1; 67 68 return BaseT::getArithmeticInstrCost(Opcode, Ty, CostKind, Op1Info, 69 Op2Info); 70 } 71 72 TTI::MemCmpExpansionOptions enableMemCmpExpansion(bool OptSize, 73 bool IsZeroCmp) const { 74 TTI::MemCmpExpansionOptions Options; 75 Options.LoadSizes = {8, 4, 2, 1}; 76 Options.MaxNumLoads = TLI->getMaxExpandSizeMemcmp(OptSize); 77 return Options; 78 } 79 80 }; 81 82 } // end namespace llvm 83 84 #endif // LLVM_LIB_TARGET_BPF_BPFTARGETTRANSFORMINFO_H 85