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1 //===-- Target.cpp ----------------------------------------------*- C++ -*-===//
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2 //
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3 // Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
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4 // See https://llvm.org/LICENSE.txt for license information.
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5 // SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
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6 //
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7 //===----------------------------------------------------------------------===//
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8 #include "Target.h"
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9
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10 #include "Latency.h"
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11 #include "Uops.h"
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12
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13 namespace llvm {
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14 namespace exegesis {
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15
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16 ExegesisTarget::~ExegesisTarget() {} // anchor.
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17
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18 static ExegesisTarget *FirstTarget = nullptr;
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19
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20 const ExegesisTarget *ExegesisTarget::lookup(llvm::Triple TT) {
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21 for (const ExegesisTarget *T = FirstTarget; T != nullptr; T = T->Next) {
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22 if (T->matchesArch(TT.getArch()))
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23 return T;
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24 }
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25 return nullptr;
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26 }
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27
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28 void ExegesisTarget::registerTarget(ExegesisTarget *Target) {
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29 if (FirstTarget == nullptr) {
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30 FirstTarget = Target;
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31 return;
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32 }
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33 if (Target->Next != nullptr)
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34 return; // Already registered.
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35 Target->Next = FirstTarget;
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36 FirstTarget = Target;
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37 }
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38
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39 std::unique_ptr<SnippetGenerator>
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40 ExegesisTarget::createSnippetGenerator(InstructionBenchmark::ModeE Mode,
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41 const LLVMState &State) const {
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42 switch (Mode) {
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43 case InstructionBenchmark::Unknown:
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44 return nullptr;
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45 case InstructionBenchmark::Latency:
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46 return createLatencySnippetGenerator(State);
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47 case InstructionBenchmark::Uops:
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48 case InstructionBenchmark::InverseThroughput:
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49 return createUopsSnippetGenerator(State);
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50 }
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51 return nullptr;
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52 }
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53
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54 std::unique_ptr<BenchmarkRunner>
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55 ExegesisTarget::createBenchmarkRunner(InstructionBenchmark::ModeE Mode,
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56 const LLVMState &State) const {
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57 switch (Mode) {
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58 case InstructionBenchmark::Unknown:
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59 return nullptr;
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60 case InstructionBenchmark::Latency:
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61 case InstructionBenchmark::InverseThroughput:
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62 return createLatencyBenchmarkRunner(State, Mode);
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63 case InstructionBenchmark::Uops:
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64 return createUopsBenchmarkRunner(State);
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65 }
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66 return nullptr;
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67 }
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68
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69 std::unique_ptr<SnippetGenerator>
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70 ExegesisTarget::createLatencySnippetGenerator(const LLVMState &State) const {
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71 return llvm::make_unique<LatencySnippetGenerator>(State);
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72 }
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73
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74 std::unique_ptr<SnippetGenerator>
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75 ExegesisTarget::createUopsSnippetGenerator(const LLVMState &State) const {
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76 return llvm::make_unique<UopsSnippetGenerator>(State);
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77 }
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78
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79 std::unique_ptr<BenchmarkRunner> ExegesisTarget::createLatencyBenchmarkRunner(
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80 const LLVMState &State, InstructionBenchmark::ModeE Mode) const {
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81 return llvm::make_unique<LatencyBenchmarkRunner>(State, Mode);
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82 }
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83
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84 std::unique_ptr<BenchmarkRunner>
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85 ExegesisTarget::createUopsBenchmarkRunner(const LLVMState &State) const {
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86 return llvm::make_unique<UopsBenchmarkRunner>(State);
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87 }
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88
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89 void ExegesisTarget::randomizeMCOperand(
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90 const Instruction &Instr, const Variable &Var,
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91 llvm::MCOperand &AssignedValue,
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92 const llvm::BitVector &ForbiddenRegs) const {
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93 const Operand &Op = Instr.getPrimaryOperand(Var);
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94 switch (Op.getExplicitOperandInfo().OperandType) {
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95 case llvm::MCOI::OperandType::OPERAND_IMMEDIATE:
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96 // FIXME: explore immediate values too.
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97 AssignedValue = llvm::MCOperand::createImm(1);
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98 break;
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99 case llvm::MCOI::OperandType::OPERAND_REGISTER: {
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100 assert(Op.isReg());
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101 auto AllowedRegs = Op.getRegisterAliasing().sourceBits();
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102 assert(AllowedRegs.size() == ForbiddenRegs.size());
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103 for (auto I : ForbiddenRegs.set_bits())
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104 AllowedRegs.reset(I);
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105 AssignedValue = llvm::MCOperand::createReg(randomBit(AllowedRegs));
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106 break;
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107 }
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108 default:
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109 break;
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110 }
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111 }
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112
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113 static_assert(std::is_pod<PfmCountersInfo>::value,
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114 "We shouldn't have dynamic initialization here");
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115 const PfmCountersInfo PfmCountersInfo::Default = {nullptr, nullptr, nullptr,
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116 0u};
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117
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118 const PfmCountersInfo &
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119 ExegesisTarget::getPfmCounters(llvm::StringRef CpuName) const {
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120 assert(std::is_sorted(
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121 CpuPfmCounters.begin(), CpuPfmCounters.end(),
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122 [](const CpuAndPfmCounters &LHS, const CpuAndPfmCounters &RHS) {
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123 return strcmp(LHS.CpuName, RHS.CpuName) < 0;
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124 }) &&
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125 "CpuPfmCounters table is not sorted");
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126
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127 // Find entry
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128 auto Found =
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129 std::lower_bound(CpuPfmCounters.begin(), CpuPfmCounters.end(), CpuName);
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130 if (Found == CpuPfmCounters.end() ||
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131 llvm::StringRef(Found->CpuName) != CpuName) {
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132 // Use the default.
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133 if (CpuPfmCounters.begin() != CpuPfmCounters.end() &&
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134 CpuPfmCounters.begin()->CpuName[0] == '\0') {
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135 Found = CpuPfmCounters.begin(); // The target specifies a default.
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136 } else {
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137 return PfmCountersInfo::Default; // No default for the target.
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138 }
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139 }
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140 assert(Found->PCI && "Missing counters");
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141 return *Found->PCI;
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142 }
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143
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144 namespace {
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145
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146 // Default implementation.
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147 class ExegesisDefaultTarget : public ExegesisTarget {
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148 public:
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149 ExegesisDefaultTarget() : ExegesisTarget({}) {}
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150
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151 private:
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152 std::vector<llvm::MCInst> setRegTo(const llvm::MCSubtargetInfo &STI,
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153 unsigned Reg,
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154 const llvm::APInt &Value) const override {
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155 llvm_unreachable("Not yet implemented");
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156 }
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157
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158 bool matchesArch(llvm::Triple::ArchType Arch) const override {
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159 llvm_unreachable("never called");
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160 return false;
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161 }
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162 };
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163
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164 } // namespace
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165
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166 const ExegesisTarget &ExegesisTarget::getDefault() {
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167 static ExegesisDefaultTarget Target;
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168 return Target;
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169 }
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170
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171 } // namespace exegesis
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172 } // namespace llvm
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