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https://github.com/RPCS3/llvm-mirror.git
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1931b181a5
Summary: The snippet-generation part goes to the SnippetGenerator class. This will allow benchmarking arbitrary code (see PR38437). Reviewers: gchatelet Subscribers: mgorny, tschuett, llvm-commits Differential Revision: https://reviews.llvm.org/D51979 llvm-svn: 342117
87 lines
2.6 KiB
C++
87 lines
2.6 KiB
C++
//===-- BenchmarkRunner.h ---------------------------------------*- C++ -*-===//
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//
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// The LLVM Compiler Infrastructure
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//
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// This file is distributed under the University of Illinois Open Source
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// License. See LICENSE.TXT for details.
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//
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//===----------------------------------------------------------------------===//
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///
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/// \file
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/// Defines the abstract BenchmarkRunner class for measuring a certain execution
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/// property of instructions (e.g. latency).
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///
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//===----------------------------------------------------------------------===//
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#ifndef LLVM_TOOLS_LLVM_EXEGESIS_BENCHMARKRUNNER_H
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#define LLVM_TOOLS_LLVM_EXEGESIS_BENCHMARKRUNNER_H
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#include "Assembler.h"
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#include "BenchmarkCode.h"
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#include "BenchmarkResult.h"
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#include "LlvmState.h"
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#include "MCInstrDescView.h"
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#include "llvm/MC/MCInst.h"
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#include "llvm/Support/Error.h"
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#include <cstdlib>
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#include <memory>
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#include <vector>
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namespace exegesis {
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// A class representing failures that happened during Benchmark, they are used
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// to report informations to the user.
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class BenchmarkFailure : public llvm::StringError {
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public:
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BenchmarkFailure(const llvm::Twine &S);
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};
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// Common code for all benchmark modes.
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class BenchmarkRunner {
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public:
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explicit BenchmarkRunner(const LLVMState &State,
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InstructionBenchmark::ModeE Mode);
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virtual ~BenchmarkRunner();
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InstructionBenchmark runConfiguration(const BenchmarkCode &Configuration,
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unsigned NumRepetitions) const;
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// Scratch space to run instructions that touch memory.
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struct ScratchSpace {
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static constexpr const size_t kAlignment = 1024;
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static constexpr const size_t kSize = 1 << 20; // 1MB.
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ScratchSpace()
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: UnalignedPtr(llvm::make_unique<char[]>(kSize + kAlignment)),
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AlignedPtr(
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UnalignedPtr.get() + kAlignment -
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(reinterpret_cast<intptr_t>(UnalignedPtr.get()) % kAlignment)) {}
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char *ptr() const { return AlignedPtr; }
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void clear() { std::memset(ptr(), 0, kSize); }
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private:
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const std::unique_ptr<char[]> UnalignedPtr;
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char *const AlignedPtr;
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};
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protected:
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const LLVMState &State;
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private:
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virtual std::vector<BenchmarkMeasure>
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runMeasurements(const ExecutableFunction &EF, ScratchSpace &Scratch,
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const unsigned NumRepetitions) const = 0;
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llvm::Expected<std::string>
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writeObjectFile(const BenchmarkCode &Configuration,
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llvm::ArrayRef<llvm::MCInst> Code) const;
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const InstructionBenchmark::ModeE Mode;
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const std::unique_ptr<ScratchSpace> Scratch;
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};
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} // namespace exegesis
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#endif // LLVM_TOOLS_LLVM_EXEGESIS_BENCHMARKRUNNER_H
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