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_transform = [](auto first1, auto last1, auto first2, auto, auto out, auto f) {
24 return std::transform(first1, last1, first2, out, f);
25 };
26
27 // {std,ranges}::transform(normal container, normal container)
28 {
29 auto bm = []<class Container>(std::string name, auto transform) {
30 benchmark::RegisterBenchmark(
31 name,
32 [transform](auto& st) {
33 std::size_t const size = st.range(0);
34 using ValueType = typename Container::value_type;
35 Container c1, c2;
36 std::generate_n(std::back_inserter(c1), size, [] { return Generate<ValueType>::random(); });
37 std::generate_n(std::back_inserter(c2), size, [] { return Generate<ValueType>::random(); });
38
39 std::vector<ValueType> out(size);
40
41 auto f = [](auto x, auto y) {
42 benchmark::DoNotOptimize(x);
43 benchmark::DoNotOptimize(y);
44 return x + y;
45 };
46
47 for ([[maybe_unused]] auto _ : st) {
48 benchmark::DoNotOptimize(c1);
49 benchmark::DoNotOptimize(c2);
50 benchmark::DoNotOptimize(out);
51 auto result = transform(c1.begin(), c1.end(), c2.begin(), c2.end(), out.begin(), f);
52 benchmark::DoNotOptimize(result);
53 }
54 })
55 ->Arg(32)
56 ->Arg(50) // non power-of-two
57 ->Arg(1024)
58 ->Arg(8192);
59 };
60 bm.operator()<std::vector<int>>(name: "std::transform(vector<int>, vector<int>)", transform: std_transform);
61 bm.operator()<std::deque<int>>(name: "std::transform(deque<int>, deque<int>)", transform: std_transform);
62 bm.operator()<std::list<int>>(name: "std::transform(list<int>, list<int>)", transform: std_transform);
63 bm.operator()<std::vector<int>>("rng::transform(vector<int>, vector<int>)", std::ranges::transform);
64 bm.operator()<std::deque<int>>("rng::transform(deque<int>, deque<int>)", std::ranges::transform);
65 bm.operator()<std::list<int>>("rng::transform(list<int>, list<int>)", std::ranges::transform);
66 }
67
68 benchmark::Initialize(&argc, argv);
69 benchmark::RunSpecifiedBenchmarks();
70 benchmark::Shutdown();
71 return 0;
72}
73

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