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
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>(x: 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 = {.Kind: TTI::OK_AnyValue, .Properties: TTI::OP_None},
52 TTI::OperandValueInfo Op2Info = {.Kind: TTI::OK_AnyValue, .Properties: 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 = {.Kind: TTI::OK_AnyValue, .Properties: TTI::OP_None},
64 TTI::OperandValueInfo Op2Info = {.Kind: TTI::OK_AnyValue, .Properties: 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, Opd1Info: Op1Info,
72 Opd2Info: Op2Info);
73 }
74
75 TTI::MemCmpExpansionOptions
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
83 unsigned getMaxNumArgs() const override { return 5; }
84};
85
86} // end namespace llvm
87
88#endif // LLVM_LIB_TARGET_BPF_BPFTARGETTRANSFORMINFO_H
89