1*4bdff4beSrobert //===----------------------------------------------------------------------===//
2*4bdff4beSrobert // Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
3*4bdff4beSrobert // See https://llvm.org/LICENSE.txt for license information.
4*4bdff4beSrobert // SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
5*4bdff4beSrobert //
6*4bdff4beSrobert //===----------------------------------------------------------------------===//
7*4bdff4beSrobert
8*4bdff4beSrobert #include <algorithm>
9*4bdff4beSrobert #include <array>
10*4bdff4beSrobert #include <cstddef>
11*4bdff4beSrobert #include <functional>
12*4bdff4beSrobert #include <random>
13*4bdff4beSrobert
14*4bdff4beSrobert #include "benchmark/benchmark.h"
15*4bdff4beSrobert
16*4bdff4beSrobert constexpr std::size_t MAX_BUFFER_LEN = 256;
17*4bdff4beSrobert constexpr std::size_t MAX_SEED_LEN = 16;
18*4bdff4beSrobert
BM_SeedSeq_Generate(benchmark::State & state)19*4bdff4beSrobert static void BM_SeedSeq_Generate(benchmark::State& state) {
20*4bdff4beSrobert std::array<std::uint32_t, MAX_BUFFER_LEN> buffer;
21*4bdff4beSrobert std::array<std::uint32_t, MAX_SEED_LEN> seeds;
22*4bdff4beSrobert {
23*4bdff4beSrobert std::random_device rd;
24*4bdff4beSrobert std::generate(std::begin(seeds), std::begin(seeds) + state.range(0), [&]() { return rd(); });
25*4bdff4beSrobert }
26*4bdff4beSrobert std::seed_seq seed(std::begin(seeds), std::begin(seeds) + state.range(0));
27*4bdff4beSrobert for (auto _ : state) {
28*4bdff4beSrobert seed.generate(std::begin(buffer), std::begin(buffer) + state.range(1));
29*4bdff4beSrobert }
30*4bdff4beSrobert }
31*4bdff4beSrobert BENCHMARK(BM_SeedSeq_Generate)->Ranges({{1, MAX_SEED_LEN}, {1, MAX_BUFFER_LEN}});
32*4bdff4beSrobert
33*4bdff4beSrobert BENCHMARK_MAIN();
34