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Optimize ranges::copy_backward for vector<bool>::iterator
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| Original file line number | Diff line number | Diff line change |
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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 | ||
| // | ||
| //===----------------------------------------------------------------------===// | ||
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| // UNSUPPORTED: c++03, c++11, c++14, c++17, c++20 | ||
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| #include <algorithm> | ||
| #include <benchmark/benchmark.h> | ||
| #include <vector> | ||
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| static void bm_ranges_copy_backward(benchmark::State& state, bool aligned) { | ||
| auto n = state.range(); | ||
| std::vector<bool> in(n, true); | ||
| std::vector<bool> out(aligned ? n : n + 8); | ||
| benchmark::DoNotOptimize(&in); | ||
| auto dst = aligned ? out.end() : out.end() - 4; | ||
| for (auto _ : state) { | ||
| benchmark::DoNotOptimize(std::ranges::copy_backward(in, dst)); | ||
| benchmark::DoNotOptimize(&out); | ||
| } | ||
| } | ||
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| static void bm_copy_backward(benchmark::State& state, bool aligned) { | ||
| auto n = state.range(); | ||
| std::vector<bool> in(n, true); | ||
| std::vector<bool> out(aligned ? n : n + 8); | ||
| benchmark::DoNotOptimize(&in); | ||
| auto beg = in.begin(); | ||
| auto end = in.end(); | ||
| auto dst = aligned ? out.end() : out.end() - 4; | ||
| for (auto _ : state) { | ||
| benchmark::DoNotOptimize(std::copy_backward(beg, end, dst)); | ||
| benchmark::DoNotOptimize(&out); | ||
| } | ||
| } | ||
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| static void bm_ranges_copy_backward_aligned(benchmark::State& state) { bm_ranges_copy_backward(state, true); } | ||
| static void bm_ranges_copy_backward_unaligned(benchmark::State& state) { bm_ranges_copy_backward(state, false); } | ||
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| static void bm_copy_backward_aligned(benchmark::State& state) { bm_copy_backward(state, true); } | ||
| static void bm_copy_backward_unaligned(benchmark::State& state) { bm_copy_backward(state, false); } | ||
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| // Test the range version of std::copy for vector<bool>::iterator | ||
| BENCHMARK(bm_ranges_copy_backward_aligned)->Range(8, 1 << 16)->DenseRange(102400, 204800, 4096); | ||
| BENCHMARK(bm_ranges_copy_backward_unaligned)->Range(8, 1 << 20); | ||
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| // Test the iterator-pair version of std::copy for vector<bool>::iterator | ||
| BENCHMARK(bm_copy_backward_aligned)->Range(8, 1 << 20); | ||
| BENCHMARK(bm_copy_backward_unaligned)->Range(8, 1 << 20); | ||
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| BENCHMARK_MAIN(); |
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