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//===----------------------------------------------------------------------===//
//
// 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
//
//===----------------------------------------------------------------------===//
// UNSUPPORTED: c++03, c++11, c++14
#include <algorithm>
#include <benchmark/benchmark.h>
#include <random>
void BenchmarkSizes(benchmark::internal::Benchmark* Benchmark) {
Benchmark->DenseRange(1, 8);
for (size_t i = 16; i != 1 << 20; i *= 2) {
Benchmark->Arg(i - 1);
Benchmark->Arg(i);
Benchmark->Arg(i + 1);
}
}
// TODO: Look into benchmarking aligned and unaligned memory explicitly
// (currently things happen to be aligned because they are malloced that way)
template <class T>
static void bm_mismatch(benchmark::State& state) {
std::vector<T> vec1(state.range(), '1');
std::vector<T> vec2(state.range(), '1');
std::mt19937_64 rng(std::random_device{}());
vec1.back() = '2';
for (auto _ : state) {
benchmark::DoNotOptimize(vec1);
benchmark::DoNotOptimize(std::mismatch(vec1.begin(), vec1.end(), vec2.begin()));
}
}
BENCHMARK(bm_mismatch<char>)->Apply(BenchmarkSizes);
BENCHMARK(bm_mismatch<short>)->Apply(BenchmarkSizes);
BENCHMARK(bm_mismatch<int>)->Apply(BenchmarkSizes);
template <class T>
static void bm_mismatch_two_range_overload(benchmark::State& state) {
std::vector<T> vec1(state.range(), '1');
std::vector<T> vec2(state.range(), '1');
std::mt19937_64 rng(std::random_device{}());
vec1.back() = '2';
for (auto _ : state) {
benchmark::DoNotOptimize(vec1);
benchmark::DoNotOptimize(std::mismatch(vec1.begin(), vec1.end(), vec2.begin(), vec2.end()));
}
}
BENCHMARK(bm_mismatch_two_range_overload<char>)->DenseRange(1, 8)->Range(16, 1 << 20);
BENCHMARK(bm_mismatch_two_range_overload<short>)->DenseRange(1, 8)->Range(16, 1 << 20);
BENCHMARK(bm_mismatch_two_range_overload<int>)->DenseRange(1, 8)->Range(16, 1 << 20);
BENCHMARK_MAIN();
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