71 lines
2.6 KiB
C++
71 lines
2.6 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, c++20
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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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#include "../../GenerateInput.h"
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int main(int argc, char** argv) {
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auto ranges_starts_with_pred = [](auto first1, auto last1, auto first2, auto last2) {
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return std::ranges::starts_with(first1, last1, first2, last2, [](auto x, auto y) {
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benchmark::DoNotOptimize(x);
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benchmark::DoNotOptimize(y);
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return x == y;
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});
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};
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// Benchmark ranges::starts_with where we find the mismatching element at the very end (worst case).
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{
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auto bm = []<class Container>(std::string name, auto starts_with) {
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benchmark::RegisterBenchmark(
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name,
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[starts_with](auto& st) {
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std::size_t const size = st.range(0);
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using ValueType = typename Container::value_type;
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ValueType x = Generate<ValueType>::random();
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ValueType y = random_different_from({x});
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Container c1(size, x);
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Container c2(size, x);
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c2.back() = y;
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for ([[maybe_unused]] auto _ : st) {
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benchmark::DoNotOptimize(c1);
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benchmark::DoNotOptimize(c2);
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auto result = starts_with(c1.begin(), c1.end(), c2.begin(), c2.end());
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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(1000) // non power-of-two
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->Arg(1024)
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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>>("rng::starts_with(vector<int>)", std::ranges::starts_with);
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bm.operator()<std::deque<int>>("rng::starts_with(deque<int>)", std::ranges::starts_with);
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bm.operator()<std::list<int>>("rng::starts_with(list<int>)", std::ranges::starts_with);
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bm.operator()<std::vector<int>>("rng::starts_with(vector<int>, pred)", ranges_starts_with_pred);
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bm.operator()<std::deque<int>>("rng::starts_with(deque<int>, pred)", ranges_starts_with_pred);
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bm.operator()<std::list<int>>("rng::starts_with(list<int>, pred)", ranges_starts_with_pred);
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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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