tools/llvm-exegesis/lib/Latency.h

   1 //===-- Latency.h -----------------------------------------------*- C++ -*-===//
   2 //
   3 //                     The LLVM Compiler Infrastructure
   4 //
   5 // This file is distributed under the University of Illinois Open Source
   6 // License. See LICENSE.TXT for details.
   7 //
   8 //===----------------------------------------------------------------------===//
   9 ///
  10 /// \file
  11 /// A BenchmarkRunner implementation to measure instruction latencies.
  12 ///
  13 //===----------------------------------------------------------------------===//
  14
  15 #ifndef LLVM_TOOLS_LLVM_EXEGESIS_LATENCY_H
  16 #define LLVM_TOOLS_LLVM_EXEGESIS_LATENCY_H
  17
  18 #include "BenchmarkRunner.h"
  19 #include "MCInstrDescView.h"
  20 #include "SnippetGenerator.h"
  21
  22 namespace exegesis {
  23
  24 class LatencySnippetGenerator : public SnippetGenerator {
  25 public:
  26   LatencySnippetGenerator(const LLVMState &State) : SnippetGenerator(State) {}
  27   ~LatencySnippetGenerator() override;
  28
  29   llvm::Expected<std::vector<CodeTemplate>>
  30   generateCodeTemplates(const Instruction &Instr) const override;
  31 };
  32
  33 class LatencyBenchmarkRunner : public BenchmarkRunner {
  34 public:
  35   LatencyBenchmarkRunner(const LLVMState &State)
  36       : BenchmarkRunner(State, InstructionBenchmark::Latency) {}
  37   ~LatencyBenchmarkRunner() override;
  38
  39 private:
  40   std::vector<BenchmarkMeasure>
  41   runMeasurements(const ExecutableFunction &EF,
  42                   ScratchSpace &Scratch) const override;
  43
  44   virtual const char *getCounterName() const;
  45 };
  46 } // namespace exegesis
  47
  48 #endif // LLVM_TOOLS_LLVM_EXEGESIS_LATENCY_H