tools/llvm-exegesis/lib/Latency.h

   1 //===-- Latency.h -----------------------------------------------*- 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 /// \file
  10 /// A BenchmarkRunner implementation to measure instruction latencies.
  11 ///
  12 //===----------------------------------------------------------------------===//
  13
  14 #ifndef LLVM_TOOLS_LLVM_EXEGESIS_LATENCY_H
  15 #define LLVM_TOOLS_LLVM_EXEGESIS_LATENCY_H
  16
  17 #include "BenchmarkRunner.h"
  18 #include "Error.h"
  19 #include "MCInstrDescView.h"
  20 #include "SnippetGenerator.h"
  21
  22 namespace llvm {
  23 namespace exegesis {
  24
  25 class LatencySnippetGenerator : public SnippetGenerator {
  26 public:
  27   using SnippetGenerator::SnippetGenerator;
  28   ~LatencySnippetGenerator() override;
  29
  30   Expected<std::vector<CodeTemplate>>
  31   generateCodeTemplates(const Instruction &Instr,
  32                         const BitVector &ForbiddenRegisters) const override;
  33 };
  34
  35 class LatencyBenchmarkRunner : public BenchmarkRunner {
  36 public:
  37   LatencyBenchmarkRunner(const LLVMState &State,
  38                          InstructionBenchmark::ModeE Mode);
  39   ~LatencyBenchmarkRunner() override;
  40
  41 private:
  42   Expected<std::vector<BenchmarkMeasure>>
  43   runMeasurements(const FunctionExecutor &Executor) const override;
  44 };
  45 } // namespace exegesis
  46 } // namespace llvm
  47
  48 #endif // LLVM_TOOLS_LLVM_EXEGESIS_LATENCY_H