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, c++11, c++14, c++17
10
11#include <algorithm>
12#include <cstddef>
13#include <deque>
14#include <iterator>
15#include <list>
16#include <string>
17#include <vector>
18
19#include "benchmark/benchmark.h"
20#include "../../GenerateInput.h"
21
22int main(int argc, char** argv) {
23 auto std_rotate_copy = [](auto first, auto middle, auto last, auto out) {
24 return std::rotate_copy(first, middle, last, out);
25 };
26
27 // {std,ranges}::rotate_copy(normal container)
28 {
29 auto bm = []<class Container>(std::string name, auto rotate_copy) {
30 benchmark::RegisterBenchmark(
31 name,
32 [rotate_copy](auto& st) {
33 std::size_t const size = st.range(0);
34 using ValueType = typename Container::value_type;
35 Container c;
36 std::generate_n(std::back_inserter(c), size, [] { return Generate<ValueType>::random(); });
37
38 std::vector<ValueType> out(size);
39
40 auto middle = std::next(c.begin(), size / 2);
41 for ([[maybe_unused]] auto _ : st) {
42 benchmark::DoNotOptimize(c);
43 benchmark::DoNotOptimize(out);
44 auto result = rotate_copy(c.begin(), middle, c.end(), out.begin());
45 benchmark::DoNotOptimize(result);
46 }
47 })
48 ->Arg(32)
49 ->Arg(50) // non power-of-two
50 ->Arg(1024)
51 ->Arg(8192);
52 };
53 bm.operator()<std::vector<int>>(name: "std::rotate_copy(vector<int>)", rotate_copy: std_rotate_copy);
54 bm.operator()<std::deque<int>>(name: "std::rotate_copy(deque<int>)", rotate_copy: std_rotate_copy);
55 bm.operator()<std::list<int>>(name: "std::rotate_copy(list<int>)", rotate_copy: std_rotate_copy);
56 bm.operator()<std::vector<int>>("rng::rotate_copy(vector<int>)", std::ranges::rotate_copy);
57 bm.operator()<std::deque<int>>("rng::rotate_copy(deque<int>)", std::ranges::rotate_copy);
58 bm.operator()<std::list<int>>("rng::rotate_copy(list<int>)", std::ranges::rotate_copy);
59 }
60
61 benchmark::Initialize(&argc, argv);
62 benchmark::RunSpecifiedBenchmarks();
63 benchmark::Shutdown();
64 return 0;
65}
66

source code of libcxx/test/benchmarks/algorithms/modifying/rotate_copy.bench.cpp