| 1 | //===----------------------------------------------------------------------===// |
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| 2 | // |
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| 3 | // Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions. |
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| 4 | // See https://llvm.org/LICENSE.txt for license information. |
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| 5 | // SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception |
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| 6 | // |
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| 7 | //===----------------------------------------------------------------------===// |
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| 8 | |
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| 9 | // UNSUPPORTED: c++03, c++11, c++14, c++17 |
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| 10 | |
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| 11 | #include <algorithm> |
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| 12 | #include <cstddef> |
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| 13 | #include <deque> |
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| 14 | #include <iterator> |
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| 15 | #include <random> |
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| 16 | #include <string> |
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| 17 | #include <vector> |
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| 18 | |
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| 19 | #include "benchmark/benchmark.h" |
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| 20 | #include "../../GenerateInput.h" |
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| 21 | |
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| 22 | int main(int argc, char** argv) { |
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| 23 | auto std_shuffle = [](auto first, auto last, auto& rng) { return std::shuffle(first, last, rng); }; |
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| 24 | |
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| 25 | // {std,ranges}::shuffle(normal container) |
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| 26 | { |
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| 27 | auto bm = []<class Container>(std::string name, auto shuffle) { |
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| 28 | benchmark::RegisterBenchmark( |
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| 29 | name, |
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| 30 | [shuffle](auto& st) { |
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| 31 | std::size_t const size = st.range(0); |
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| 32 | using ValueType = typename Container::value_type; |
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| 33 | Container c; |
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| 34 | std::generate_n(std::back_inserter(c), size, [] { return Generate<ValueType>::random(); }); |
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| 35 | std::mt19937 rng; |
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| 36 | |
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| 37 | for ([[maybe_unused]] auto _ : st) { |
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| 38 | benchmark::DoNotOptimize(c); |
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| 39 | shuffle(c.begin(), c.end(), rng); |
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| 40 | benchmark::DoNotOptimize(c); |
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| 41 | } |
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| 42 | }) |
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| 43 | ->Arg(32) |
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| 44 | ->Arg(1024) |
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| 45 | ->Arg(8192); |
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| 46 | }; |
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| 47 | bm.operator()<std::vector<int>>(name: "std::shuffle(vector<int>)" , shuffle: std_shuffle); |
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| 48 | bm.operator()<std::deque<int>>(name: "std::shuffle(deque<int>)" , shuffle: std_shuffle); |
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| 49 | bm.operator()<std::vector<int>>("rng::shuffle(vector<int>)" , std::ranges::shuffle); |
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| 50 | bm.operator()<std::deque<int>>("rng::shuffle(deque<int>)" , std::ranges::shuffle); |
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| 51 | } |
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| 52 | |
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| 53 | benchmark::Initialize(&argc, argv); |
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| 54 | benchmark::RunSpecifiedBenchmarks(); |
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| 55 | benchmark::Shutdown(); |
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| 56 | return 0; |
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| 57 | } |
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| 58 | |
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