Memcpy.cpp
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//===-- Benchmark memcpy implementation -----------------------------------===//
//
// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
// See https://llvm.org/LICENSE.txt for license information.
// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
//
//===----------------------------------------------------------------------===//
#include "LibcBenchmark.h"
#include "LibcMemoryBenchmark.h"
#include "LibcMemoryBenchmarkMain.h"
#include "llvm/ADT/StringSwitch.h"
#include "llvm/Support/raw_ostream.h"
#include <memory>
namespace __llvm_libc {
extern void *memcpy(void *__restrict, const void *__restrict, size_t);
} // namespace __llvm_libc
namespace llvm {
namespace libc_benchmarks {
// The context encapsulates the buffers, parameters and the measure.
struct MemcpyContext : public BenchmarkRunner {
using FunctionPrototype = void *(*)(void *, const void *, size_t);
struct ParameterType {
uint16_t SrcOffset = 0;
uint16_t DstOffset = 0;
};
explicit MemcpyContext(const StudyConfiguration &Conf)
: OD(Conf), SrcBuffer(Conf.BufferSize), DstBuffer(Conf.BufferSize),
PP(*this) {}
// Needed by the ParameterProvider to update the current batch of parameter.
void Randomize(MutableArrayRef<ParameterType> Parameters) {
for (auto &P : Parameters) {
P.DstOffset = OD(Gen);
P.SrcOffset = OD(Gen);
}
}
ArrayRef<StringRef> getFunctionNames() const override {
static std::array<StringRef, 1> kFunctionNames = {"memcpy"};
return kFunctionNames;
}
BenchmarkResult benchmark(const BenchmarkOptions &Options,
StringRef FunctionName, size_t Size) override {
FunctionPrototype Function = StringSwitch<FunctionPrototype>(FunctionName)
.Case("memcpy", &__llvm_libc::memcpy);
return llvm::libc_benchmarks::benchmark(
Options, PP, [this, Function, Size](ParameterType p) {
Function(DstBuffer + p.DstOffset, SrcBuffer + p.SrcOffset, Size);
return DstBuffer + p.DstOffset;
});
}
private:
std::default_random_engine Gen;
OffsetDistribution OD;
AlignedBuffer SrcBuffer;
AlignedBuffer DstBuffer;
SmallParameterProvider<MemcpyContext> PP;
};
std::unique_ptr<BenchmarkRunner> getRunner(const StudyConfiguration &Conf) {
return std::make_unique<MemcpyContext>(Conf);
}
} // namespace libc_benchmarks
} // namespace llvm