1 //===-- LanaiTargetTransformInfo.h - Lanai specific TTI ---------*- C++ -*-===//
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
7 //===----------------------------------------------------------------------===//
9 // This file a TargetTransformInfo::Concept conforming object specific to the
10 // Lanai target machine. It uses the target's detailed information to
11 // provide more precise answers to certain TTI queries, while letting the
12 // target independent and default TTI implementations handle the rest.
14 //===----------------------------------------------------------------------===//
16 #ifndef LLVM_LIB_TARGET_LANAI_LANAITARGETTRANSFORMINFO_H
17 #define LLVM_LIB_TARGET_LANAI_LANAITARGETTRANSFORMINFO_H
20 #include "LanaiSubtarget.h"
21 #include "LanaiTargetMachine.h"
22 #include "llvm/Analysis/TargetTransformInfo.h"
23 #include "llvm/CodeGen/BasicTTIImpl.h"
24 #include "llvm/CodeGen/TargetLowering.h"
25 #include "llvm/Support/MathExtras.h"
28 class LanaiTTIImpl : public BasicTTIImplBase<LanaiTTIImpl> {
29 typedef BasicTTIImplBase<LanaiTTIImpl> BaseT;
30 typedef TargetTransformInfo TTI;
33 const LanaiSubtarget *ST;
34 const LanaiTargetLowering *TLI;
36 const LanaiSubtarget *getST() const { return ST; }
37 const LanaiTargetLowering *getTLI() const { return TLI; }
40 explicit LanaiTTIImpl(const LanaiTargetMachine *TM, const Function &F)
41 : BaseT(TM, F.getParent()->getDataLayout()), ST(TM->getSubtargetImpl(F)),
42 TLI(ST->getTargetLowering()) {}
44 bool shouldBuildLookupTables() const { return false; }
46 TargetTransformInfo::PopcntSupportKind getPopcntSupport(unsigned TyWidth) {
48 return TTI::PSK_FastHardware;
49 return TTI::PSK_Software;
52 InstructionCost getIntImmCost(const APInt &Imm, Type *Ty,
53 TTI::TargetCostKind CostKind) {
54 assert(Ty->isIntegerTy());
55 unsigned BitSize = Ty->getPrimitiveSizeInBits();
56 // There is no cost model for constants with a bit size of 0. Return
57 // TCC_Free here, so that constant hoisting will ignore this constant.
60 // No cost model for operations on integers larger than 64 bit implemented
67 if (isInt<16>(Imm.getSExtValue()))
68 return TTI::TCC_Basic;
69 if (isInt<21>(Imm.getZExtValue()))
70 return TTI::TCC_Basic;
71 if (isInt<32>(Imm.getSExtValue())) {
72 if ((Imm.getSExtValue() & 0xFFFF) == 0)
73 return TTI::TCC_Basic;
74 return 2 * TTI::TCC_Basic;
77 return 4 * TTI::TCC_Basic;
80 InstructionCost getIntImmCostInst(unsigned Opc, unsigned Idx,
81 const APInt &Imm, Type *Ty,
82 TTI::TargetCostKind CostKind,
83 Instruction *Inst = nullptr) {
84 return getIntImmCost(Imm, Ty, CostKind);
87 InstructionCost getIntImmCostIntrin(Intrinsic::ID IID, unsigned Idx,
88 const APInt &Imm, Type *Ty,
89 TTI::TargetCostKind CostKind) {
90 return getIntImmCost(Imm, Ty, CostKind);
93 InstructionCost getArithmeticInstrCost(
94 unsigned Opcode, Type *Ty, TTI::TargetCostKind CostKind,
95 TTI::OperandValueInfo Op1Info = {TTI::OK_AnyValue, TTI::OP_None},
96 TTI::OperandValueInfo Op2Info = {TTI::OK_AnyValue, TTI::OP_None},
97 ArrayRef<const Value *> Args = ArrayRef<const Value *>(),
98 const Instruction *CxtI = nullptr) {
99 int ISD = TLI->InstructionOpcodeToISD(Opcode);
103 return BaseT::getArithmeticInstrCost(Opcode, Ty, CostKind, Op1Info,
109 // This increases the cost associated with multiplication and division
110 // to 64 times what the baseline arithmetic cost is. The arithmetic
111 // instruction cost was arbitrarily chosen to reduce the desirability
112 // of emitting arithmetic instructions that are emulated in software.
113 // TODO: Investigate the performance impact given specialized lowerings.
114 return 64 * BaseT::getArithmeticInstrCost(Opcode, Ty, CostKind, Op1Info,
120 } // end namespace llvm
122 #endif // LLVM_LIB_TARGET_LANAI_LANAITARGETTRANSFORMINFO_H