59 lines
2.0 KiB
C++

//===----------------------------------------------------------------------===//
//
// 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, c++17
#include <algorithm>
#include <cstddef>
#include <deque>
#include <list>
#include <string>
#include <vector>
#include <benchmark/benchmark.h>
int main(int argc, char** argv) {
auto std_for_each = [](auto first, auto last, auto f) { return std::for_each(first, last, f); };
// {std,ranges}::for_each
{
auto bm = []<class Container>(std::string name, auto for_each) {
benchmark::RegisterBenchmark(
name,
[for_each](auto& st) {
std::size_t const size = st.range(0);
Container c(size, 1);
auto first = c.begin();
auto last = c.end();
for ([[maybe_unused]] auto _ : st) {
benchmark::DoNotOptimize(c);
auto result = for_each(first, last, [](int& x) { x = std::clamp(x, 10, 100); });
benchmark::DoNotOptimize(result);
}
})
->Arg(8)
->Arg(32)
->Arg(50) // non power-of-two
->Arg(8192)
->Arg(1 << 20);
};
bm.operator()<std::vector<int>>("std::for_each(vector<int>)", std_for_each);
bm.operator()<std::deque<int>>("std::for_each(deque<int>)", std_for_each);
bm.operator()<std::list<int>>("std::for_each(list<int>)", std_for_each);
bm.operator()<std::vector<int>>("rng::for_each(vector<int>)", std::ranges::for_each);
bm.operator()<std::deque<int>>("rng::for_each(deque<int>)", std::ranges::for_each);
bm.operator()<std::list<int>>("rng::for_each(list<int>)", std::ranges::for_each);
}
benchmark::Initialize(&argc, argv);
benchmark::RunSpecifiedBenchmarks();
benchmark::Shutdown();
return 0;
}