1//===-- LanaiTargetTransformInfo.h - Lanai 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 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.
13//
14//===----------------------------------------------------------------------===//
15
16#ifndef LLVM_LIB_TARGET_LANAI_LANAITARGETTRANSFORMINFO_H
17#define LLVM_LIB_TARGET_LANAI_LANAITARGETTRANSFORMINFO_H
18
19#include "Lanai.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"
26
27namespace llvm {
28class LanaiTTIImpl : public BasicTTIImplBase<LanaiTTIImpl> {
29  typedef BasicTTIImplBase<LanaiTTIImpl> BaseT;
30  typedef TargetTransformInfo TTI;
31  friend BaseT;
32
33  const LanaiSubtarget *ST;
34  const LanaiTargetLowering *TLI;
35
36  const LanaiSubtarget *getST() const { return ST; }
37  const LanaiTargetLowering *getTLI() const { return TLI; }
38
39public:
40  explicit LanaiTTIImpl(const LanaiTargetMachine *TM, const Function &F)
41      : BaseT(TM, F.getParent()->getDataLayout()), ST(TM->getSubtargetImpl(F)),
42        TLI(ST->getTargetLowering()) {}
43
44  bool shouldBuildLookupTables() const { return false; }
45
46  TargetTransformInfo::PopcntSupportKind getPopcntSupport(unsigned TyWidth) {
47    if (TyWidth == 32)
48      return TTI::PSK_FastHardware;
49    return TTI::PSK_Software;
50  }
51
52  InstructionCost getIntImmCost(const APInt &Imm, Type *Ty,
53                                TTI::TargetCostKind CostKind) {
54    assert(Ty->isIntegerTy());
55    if (Imm == 0)
56      return TTI::TCC_Free;
57    if (isInt<16>(Imm.getSExtValue()))
58      return TTI::TCC_Basic;
59    if (isInt<21>(Imm.getZExtValue()))
60      return TTI::TCC_Basic;
61    if (isInt<32>(Imm.getSExtValue())) {
62      if ((Imm.getSExtValue() & 0xFFFF) == 0)
63        return TTI::TCC_Basic;
64      return 2 * TTI::TCC_Basic;
65    }
66
67    return 4 * TTI::TCC_Basic;
68  }
69
70  InstructionCost getIntImmCostInst(unsigned Opc, unsigned Idx,
71                                    const APInt &Imm, Type *Ty,
72                                    TTI::TargetCostKind CostKind,
73                                    Instruction *Inst = nullptr) {
74    return getIntImmCost(Imm, Ty, CostKind);
75  }
76
77  InstructionCost getIntImmCostIntrin(Intrinsic::ID IID, unsigned Idx,
78                                      const APInt &Imm, Type *Ty,
79                                      TTI::TargetCostKind CostKind) {
80    return getIntImmCost(Imm, Ty, CostKind);
81  }
82
83  InstructionCost getArithmeticInstrCost(
84      unsigned Opcode, Type *Ty,
85      TTI::TargetCostKind CostKind = TTI::TCK_RecipThroughput,
86      TTI::OperandValueKind Opd1Info = TTI::OK_AnyValue,
87      TTI::OperandValueKind Opd2Info = TTI::OK_AnyValue,
88      TTI::OperandValueProperties Opd1PropInfo = TTI::OP_None,
89      TTI::OperandValueProperties Opd2PropInfo = TTI::OP_None,
90      ArrayRef<const Value *> Args = ArrayRef<const Value *>(),
91      const Instruction *CxtI = nullptr) {
92    int ISD = TLI->InstructionOpcodeToISD(Opcode);
93
94    switch (ISD) {
95    default:
96      return BaseT::getArithmeticInstrCost(Opcode, Ty, CostKind, Opd1Info,
97                                           Opd2Info,
98                                           Opd1PropInfo, Opd2PropInfo);
99    case ISD::MUL:
100    case ISD::SDIV:
101    case ISD::UDIV:
102    case ISD::UREM:
103      // This increases the cost associated with multiplication and division
104      // to 64 times what the baseline arithmetic cost is. The arithmetic
105      // instruction cost was arbitrarily chosen to reduce the desirability
106      // of emitting arithmetic instructions that are emulated in software.
107      // TODO: Investigate the performance impact given specialized lowerings.
108      return 64 * BaseT::getArithmeticInstrCost(Opcode, Ty, CostKind, Opd1Info,
109                                                Opd2Info,
110                                                Opd1PropInfo, Opd2PropInfo);
111    }
112  }
113};
114
115} // end namespace llvm
116
117#endif // LLVM_LIB_TARGET_LANAI_LANAITARGETTRANSFORMINFO_H
118