1 //===----------------------------------------------------------------------===// 2 // Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions. 3 // See https://llvm.org/LICENSE.txt for license information. 4 // SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception 5 // 6 //===----------------------------------------------------------------------===// 7 8 #include <algorithm> 9 #include <array> 10 #include <cstddef> 11 #include <functional> 12 #include <random> 13 14 #include "benchmark/benchmark.h" 15 16 constexpr std::size_t MAX_BUFFER_LEN = 256; 17 constexpr std::size_t MAX_SEED_LEN = 16; 18 19 static void BM_SeedSeq_Generate(benchmark::State& state) { 20 std::array<std::uint32_t, MAX_BUFFER_LEN> buffer; 21 std::array<std::uint32_t, MAX_SEED_LEN> seeds; 22 { 23 std::random_device rd; 24 std::generate(std::begin(seeds), std::begin(seeds) + state.range(0), [&]() { return rd(); }); 25 } 26 std::seed_seq seed(std::begin(seeds), std::begin(seeds) + state.range(0)); 27 for (auto _ : state) { 28 seed.generate(std::begin(buffer), std::begin(buffer) + state.range(1)); 29 } 30 } 31 BENCHMARK(BM_SeedSeq_Generate)->Ranges({{1, MAX_SEED_LEN}, {1, MAX_BUFFER_LEN}}); 32 33 BENCHMARK_MAIN(); 34