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  int getIntImmCost(const APInt &Imm, Type *Ty) {
53    assert(Ty->isIntegerTy());
54    if (Imm == 0)
55      return TTI::TCC_Free;
56    if (isInt<16>(Imm.getSExtValue()))
57      return TTI::TCC_Basic;
58    if (isInt<21>(Imm.getZExtValue()))
59      return TTI::TCC_Basic;
60    if (isInt<32>(Imm.getSExtValue())) {
61      if ((Imm.getSExtValue() & 0xFFFF) == 0)
62        return TTI::TCC_Basic;
63      return 2 * TTI::TCC_Basic;
64    }
65
66    return 4 * TTI::TCC_Basic;
67  }
68
69  int getIntImmCostInst(unsigned Opc, unsigned Idx, const APInt &Imm, Type *Ty) {
70    return getIntImmCost(Imm, Ty);
71  }
72
73  int getIntImmCostIntrin(Intrinsic::ID IID, unsigned Idx, const APInt &Imm,
74                          Type *Ty) {
75    return getIntImmCost(Imm, Ty);
76  }
77
78  unsigned getArithmeticInstrCost(
79      unsigned Opcode, Type *Ty,
80      TTI::OperandValueKind Opd1Info = TTI::OK_AnyValue,
81      TTI::OperandValueKind Opd2Info = TTI::OK_AnyValue,
82      TTI::OperandValueProperties Opd1PropInfo = TTI::OP_None,
83      TTI::OperandValueProperties Opd2PropInfo = TTI::OP_None,
84      ArrayRef<const Value *> Args = ArrayRef<const Value *>(),
85      const Instruction *CxtI = nullptr) {
86    int ISD = TLI->InstructionOpcodeToISD(Opcode);
87
88    switch (ISD) {
89    default:
90      return BaseT::getArithmeticInstrCost(Opcode, Ty, Opd1Info, Opd2Info,
91                                           Opd1PropInfo, Opd2PropInfo);
92    case ISD::MUL:
93    case ISD::SDIV:
94    case ISD::UDIV:
95    case ISD::UREM:
96      // This increases the cost associated with multiplication and division
97      // to 64 times what the baseline arithmetic cost is. The arithmetic
98      // instruction cost was arbitrarily chosen to reduce the desirability
99      // of emitting arithmetic instructions that are emulated in software.
100      // TODO: Investigate the performance impact given specialized lowerings.
101      return 64 * BaseT::getArithmeticInstrCost(Opcode, Ty, Opd1Info, Opd2Info,
102                                                Opd1PropInfo, Opd2PropInfo);
103    }
104  }
105};
106
107} // end namespace llvm
108
109#endif // LLVM_LIB_TARGET_LANAI_LANAITARGETTRANSFORMINFO_H
110