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Abseil benchmarks suggest that the conditional checks result in faster code (4-5x) as they are compiled into conditional move instructions (cmov on x86). Reviewed By: #libc, philnik, Mordante Spies: pengfei, Mordante, philnik, libcxx-commits Differential Revision: https://reviews.llvm.org/D125329
34 lines
1.1 KiB
C++
34 lines
1.1 KiB
C++
//===----------------------------------------------------------------------===//
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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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#include <algorithm>
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#include <array>
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#include <cstddef>
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#include <functional>
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#include <random>
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#include "benchmark/benchmark.h"
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constexpr std::size_t MAX_BUFFER_LEN = 256;
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constexpr std::size_t MAX_SEED_LEN = 16;
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static void BM_SeedSeq_Generate(benchmark::State& state) {
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std::array<std::uint32_t, MAX_BUFFER_LEN> buffer;
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std::array<std::uint32_t, MAX_SEED_LEN> seeds;
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{
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std::random_device rd;
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std::generate(std::begin(seeds), std::begin(seeds) + state.range(0), [&]() { return rd(); });
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}
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std::seed_seq seed(std::begin(seeds), std::begin(seeds) + state.range(0));
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for (auto _ : state) {
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seed.generate(std::begin(buffer), std::begin(buffer) + state.range(1));
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}
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}
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BENCHMARK(BM_SeedSeq_Generate)->Ranges({{1, MAX_SEED_LEN}, {1, MAX_BUFFER_LEN}});
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BENCHMARK_MAIN();
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