1 //===----------------------------------------------------------------------===// 2 // 3 // Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions. 4 // See https://llvm.org/LICENSE.txt for license information. 5 // SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception 6 // 7 //===----------------------------------------------------------------------===// 8 9 // UNSUPPORTED: c++03 10 11 #include <algorithm> 12 #include <array> 13 #include <cstddef> 14 #include <cstdint> 15 #include <functional> 16 #include <random> 17 18 #include "benchmark/benchmark.h" 19 20 constexpr std::size_t MAX_BUFFER_LEN = 256; 21 constexpr std::size_t MAX_SEED_LEN = 16; 22 23 static void BM_SeedSeq_Generate(benchmark::State& state) { 24 std::array<std::uint32_t, MAX_BUFFER_LEN> buffer; 25 std::array<std::uint32_t, MAX_SEED_LEN> seeds; 26 { 27 std::random_device rd; 28 std::generate(std::begin(seeds), std::begin(seeds) + state.range(0), [&]() { return rd(); }); 29 } 30 std::seed_seq seed(std::begin(seeds), std::begin(seeds) + state.range(0)); 31 for (auto _ : state) { 32 seed.generate(std::begin(buffer), std::begin(buffer) + state.range(1)); 33 } 34 } 35 BENCHMARK(BM_SeedSeq_Generate)->Ranges({{1, MAX_SEED_LEN}, {1, MAX_BUFFER_LEN}}); 36 37 BENCHMARK_MAIN(); 38