8feb5bac32
This patch adds benchmarks for the copy family of algorithms (copy, copy_n, copy_if, copy_backward).
85 lines
3.4 KiB
C++
85 lines
3.4 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 <iterator>
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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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#include "test_macros.h"
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int main(int argc, char** argv) {
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auto std_copy_backward = [](auto first, auto last, auto out) { return std::copy_backward(first, last, out); };
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// {std,ranges}::copy_n(normal container)
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{
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auto bm = []<class Container>(std::string name, auto copy_backward) {
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benchmark::RegisterBenchmark(name, [copy_backward](auto& st) {
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std::size_t const n = st.range(0);
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using ValueType = typename Container::value_type;
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Container c;
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std::generate_n(std::back_inserter(c), n, [] { return Generate<ValueType>::random(); });
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std::vector<ValueType> out(n);
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for ([[maybe_unused]] auto _ : st) {
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benchmark::DoNotOptimize(c);
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benchmark::DoNotOptimize(out);
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auto result = copy_backward(c.begin(), c.end(), out.end());
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benchmark::DoNotOptimize(result);
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}
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})->Range(8, 1 << 20);
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};
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bm.operator()<std::vector<int>>("std::copy_backward(vector<int>)", std_copy_backward);
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bm.operator()<std::deque<int>>("std::copy_backward(deque<int>)", std_copy_backward);
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bm.operator()<std::list<int>>("std::copy_backward(list<int>)", std_copy_backward);
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bm.operator()<std::vector<int>>("rng::copy_backward(vector<int>)", std::ranges::copy_backward);
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bm.operator()<std::deque<int>>("rng::copy_backward(deque<int>)", std::ranges::copy_backward);
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bm.operator()<std::list<int>>("rng::copy_backward(list<int>)", std::ranges::copy_backward);
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}
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// {std,ranges}::copy_n(vector<bool>)
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{
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auto bm = []<bool Aligned>(std::string name, auto copy_backward) {
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benchmark::RegisterBenchmark(name, [copy_backward](auto& st) {
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std::size_t const n = st.range(0);
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std::vector<bool> in(n, true);
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std::vector<bool> out(Aligned ? n : n + 8);
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benchmark::DoNotOptimize(&in);
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auto first = in.begin();
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auto last = in.end();
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auto dst = Aligned ? out.end() : out.end() - 4;
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for ([[maybe_unused]] auto _ : st) {
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benchmark::DoNotOptimize(in);
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benchmark::DoNotOptimize(out);
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auto result = copy_backward(first, last, dst);
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benchmark::DoNotOptimize(result);
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}
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})->Range(64, 1 << 20);
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};
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bm.operator()<true>("std::copy_backward(vector<bool>) (aligned)", std_copy_backward);
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bm.operator()<false>("std::copy_backward(vector<bool>) (unaligned)", std_copy_backward);
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#if TEST_STD_VER >= 23 // vector<bool>::iterator is not an output_iterator before C++23
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bm.operator()<true>("rng::copy_backward(vector<bool>) (aligned)", std::ranges::copy_backward);
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bm.operator()<false>("rng::copy_backward(vector<bool>) (unaligned)", std::ranges::copy_backward);
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#endif
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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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