foundationdb/flowbench/BenchMem.cpp

/*
 * BenchMem.cpp
 *
 * This source file is part of the FoundationDB open source project
 *
 * Copyright 2013-2022 Apple Inc. and the FoundationDB project authors
 *
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 *     http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */

#include <cstring>
#include <memory>

#include "benchmark/benchmark.h"

static void bench_memcmp(benchmark::State& state) {
	constexpr int kLength = 10000;
	std::unique_ptr<char[]> b1{ new char[kLength] };
	std::unique_ptr<char[]> b2{ new char[kLength] };
	memset(b1.get(), 0, kLength);
	memset(b2.get(), 0, kLength);
	b2.get()[kLength - 1] = 1;

	while (state.KeepRunning()) {
		benchmark::DoNotOptimize(memcmp(b1.get(), b2.get(), kLength));
	}
}

static void bench_memcpy(benchmark::State& state) {
	constexpr int kLength = 10000;
	std::unique_ptr<char[]> b1{ new char[kLength] };
	std::unique_ptr<char[]> b2{ new char[kLength] };
	memset(b1.get(), 0, kLength);

	while (state.KeepRunning()) {
		benchmark::DoNotOptimize(memcpy(b2.get(), b1.get(), kLength));
	}
}

BENCHMARK(bench_memcmp);
BENCHMARK(bench_memcpy);