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a28f67c075
Reviewers: courbet Subscribers: llvm-commits, bdb Tags: #llvm Differential Revision: https://reviews.llvm.org/D60317 llvm-svn: 357769
96 lines
2.9 KiB
C++
96 lines
2.9 KiB
C++
//===-- BenchmarkRunner.h ---------------------------------------*- C++ -*-===//
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//
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// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
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// See https://llvm.org/LICENSE.txt for license information.
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// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
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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 llvm {
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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,
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bool DumpObjectToDisk) 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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// A helper to measure counters while executing a function in a sandboxed
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// context.
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class FunctionExecutor {
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public:
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virtual ~FunctionExecutor();
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virtual llvm::Expected<int64_t>
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runAndMeasure(const char *Counters) const = 0;
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};
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protected:
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const LLVMState &State;
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const InstructionBenchmark::ModeE Mode;
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private:
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virtual llvm::Expected<std::vector<BenchmarkMeasure>>
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runMeasurements(const FunctionExecutor &Executor) 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 std::unique_ptr<ScratchSpace> Scratch;
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};
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} // namespace exegesis
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} // namespace llvm
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#endif // LLVM_TOOLS_LLVM_EXEGESIS_BENCHMARKRUNNER_H
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