59 lines
2.0 KiB
C++
59 lines
2.0 KiB
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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// UNSUPPORTED: c++03, c++11, c++14, c++17
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#include <algorithm>
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#include <cstddef>
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#include <deque>
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#include <list>
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#include <string>
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#include <vector>
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#include <benchmark/benchmark.h>
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int main(int argc, char** argv) {
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auto std_for_each = [](auto first, auto last, auto f) { return std::for_each(first, last, f); };
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// {std,ranges}::for_each
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{
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auto bm = []<class Container>(std::string name, auto for_each) {
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benchmark::RegisterBenchmark(
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name,
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[for_each](auto& st) {
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std::size_t const size = st.range(0);
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Container c(size, 1);
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auto first = c.begin();
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auto last = c.end();
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for ([[maybe_unused]] auto _ : st) {
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benchmark::DoNotOptimize(c);
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auto result = for_each(first, last, [](int& x) { x = std::clamp(x, 10, 100); });
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benchmark::DoNotOptimize(result);
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}
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})
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->Arg(8)
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->Arg(32)
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->Arg(50) // non power-of-two
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->Arg(8192)
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->Arg(1 << 20);
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};
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bm.operator()<std::vector<int>>("std::for_each(vector<int>)", std_for_each);
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bm.operator()<std::deque<int>>("std::for_each(deque<int>)", std_for_each);
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bm.operator()<std::list<int>>("std::for_each(list<int>)", std_for_each);
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bm.operator()<std::vector<int>>("rng::for_each(vector<int>)", std::ranges::for_each);
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bm.operator()<std::deque<int>>("rng::for_each(deque<int>)", std::ranges::for_each);
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bm.operator()<std::list<int>>("rng::for_each(list<int>)", std::ranges::for_each);
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}
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benchmark::Initialize(&argc, argv);
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benchmark::RunSpecifiedBenchmarks();
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benchmark::Shutdown();
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return 0;
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}
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