1 //===----------------------------------------------------------------------===//
2 // Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
3 // See https://llvm.org/LICENSE.txt for license information.
4 // SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
5 //
6 //===----------------------------------------------------------------------===//
7
8 #include <format>
9
10 #include <iterator>
11 #include <algorithm>
12 #include <array>
13 #include <list>
14 #include <span>
15 #include <string>
16 #include <vector>
17
18 #include "benchmark/benchmark.h"
19 #include "make_string.h"
20
21 #define CSTR(S) MAKE_CSTRING(CharT, S)
22
23 /*** Back inserter ***/
24
25 template <class Container>
BM_format_to_string_back_inserter(benchmark::State & state)26 static void BM_format_to_string_back_inserter(benchmark::State& state) {
27 using CharT = typename Container::value_type;
28 size_t size = state.range(0);
29 auto str = std::basic_string<CharT>(size, CharT('*'));
30
31 for (auto _ : state) {
32 Container output;
33 benchmark::DoNotOptimize(std::format_to(std::back_inserter(output), CSTR("{}"), str));
34 }
35 state.SetBytesProcessed(state.iterations() * size * sizeof(CharT));
36 }
37
38 /*** Begin ***/
39
40 template <class Container>
BM_format_to_string_begin(benchmark::State & state)41 static void BM_format_to_string_begin(benchmark::State& state) {
42 using CharT = typename Container::value_type;
43 size_t size = state.range(0);
44 auto str = std::basic_string<CharT>(size, CharT('*'));
45
46 Container output(size, CharT('-'));
47 for (auto _ : state)
48 benchmark::DoNotOptimize(std::format_to(std::begin(output), CSTR("{}"), str));
49
50 state.SetBytesProcessed(state.iterations() * size * sizeof(CharT));
51 }
52
53 /*** Pointer ***/
54
55 template <class CharT>
BM_format_to_string_span(benchmark::State & state)56 static void BM_format_to_string_span(benchmark::State& state) {
57 size_t size = state.range(0);
58 auto str = std::basic_string<CharT>(size, CharT('*'));
59
60 auto buffer = std::basic_string<CharT>(size, CharT('-'));
61 std::span<CharT> output{buffer};
62 for (auto _ : state)
63 benchmark::DoNotOptimize(std::format_to(std::begin(output), CSTR("{}"), str));
64
65 state.SetBytesProcessed(state.iterations() * size * sizeof(CharT));
66 }
67
68 template <class CharT>
BM_format_to_string_pointer(benchmark::State & state)69 static void BM_format_to_string_pointer(benchmark::State& state) {
70 size_t size = state.range(0);
71 auto str = std::basic_string<CharT>(size, CharT('*'));
72
73 auto buffer = std::basic_string<CharT>(size, CharT('-'));
74 CharT* output = buffer.data();
75 for (auto _ : state)
76 benchmark::DoNotOptimize(std::format_to(output, CSTR("{}"), str));
77
78 state.SetBytesProcessed(state.iterations() * size * sizeof(CharT));
79 }
80
81 /*** Main ***/
82
83 BENCHMARK_TEMPLATE(BM_format_to_string_back_inserter, std::string)->RangeMultiplier(2)->Range(1, 1 << 20);
84 BENCHMARK_TEMPLATE(BM_format_to_string_back_inserter, std::vector<char>)->RangeMultiplier(2)->Range(1, 1 << 20);
85 BENCHMARK_TEMPLATE(BM_format_to_string_back_inserter, std::list<char>)->RangeMultiplier(2)->Range(1, 1 << 20);
86 BENCHMARK_TEMPLATE(BM_format_to_string_begin, std::string)->RangeMultiplier(2)->Range(1, 1 << 20);
87 BENCHMARK_TEMPLATE(BM_format_to_string_begin, std::vector<char>)->RangeMultiplier(2)->Range(1, 1 << 20);
88 BENCHMARK_TEMPLATE(BM_format_to_string_begin, std::list<char>)->RangeMultiplier(2)->Range(1, 1 << 20);
89 BENCHMARK_TEMPLATE(BM_format_to_string_span, char)->RangeMultiplier(2)->Range(1, 1 << 20);
90 BENCHMARK_TEMPLATE(BM_format_to_string_pointer, char)->RangeMultiplier(2)->Range(1, 1 << 20);
91
92 BENCHMARK_TEMPLATE(BM_format_to_string_back_inserter, std::wstring)->RangeMultiplier(2)->Range(1, 1 << 20);
93 BENCHMARK_TEMPLATE(BM_format_to_string_back_inserter, std::vector<wchar_t>)->RangeMultiplier(2)->Range(1, 1 << 20);
94 BENCHMARK_TEMPLATE(BM_format_to_string_back_inserter, std::list<wchar_t>)->RangeMultiplier(2)->Range(1, 1 << 20);
95 BENCHMARK_TEMPLATE(BM_format_to_string_begin, std::wstring)->RangeMultiplier(2)->Range(1, 1 << 20);
96 BENCHMARK_TEMPLATE(BM_format_to_string_begin, std::vector<wchar_t>)->RangeMultiplier(2)->Range(1, 1 << 20);
97 BENCHMARK_TEMPLATE(BM_format_to_string_begin, std::list<wchar_t>)->RangeMultiplier(2)->Range(1, 1 << 20);
98 BENCHMARK_TEMPLATE(BM_format_to_string_span, wchar_t)->RangeMultiplier(2)->Range(1, 1 << 20);
99 BENCHMARK_TEMPLATE(BM_format_to_string_pointer, wchar_t)->RangeMultiplier(2)->Range(1, 1 << 20);
100
main(int argc,char ** argv)101 int main(int argc, char** argv) {
102 benchmark::Initialize(&argc, argv);
103 if (benchmark::ReportUnrecognizedArguments(argc, argv))
104 return 1;
105
106 benchmark::RunSpecifiedBenchmarks();
107 }
108