1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
|
//===----------------------------------------------------------------------===//
//
// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
// See https://llvm.org/LICENSE.txt for license information.
// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
//
//===----------------------------------------------------------------------===//
// UNSUPPORTED: c++03, c++11, c++14, c++17
#include <format>
#include <algorithm>
#include <array>
#include <iterator>
#include <list>
#include <span>
#include <string>
#include <vector>
#include "benchmark/benchmark.h"
#include "make_string.h"
#include "test_macros.h"
#define CSTR(S) MAKE_CSTRING(CharT, S)
/*** Back inserter ***/
template <class Container>
static void BM_format_to_n_string_back_inserter(benchmark::State& state) {
using CharT = typename Container::value_type;
size_t size = state.range(0);
auto str = std::basic_string<CharT>(2 * size, CharT('*'));
for (auto _ : state) {
Container output;
benchmark::DoNotOptimize(std::format_to_n(std::back_inserter(output), size, CSTR("{}"), str));
}
state.SetBytesProcessed(state.iterations() * size * sizeof(CharT));
}
/*** Begin ***/
template <class Container>
static void BM_format_to_n_string_begin(benchmark::State& state) {
using CharT = typename Container::value_type;
size_t size = state.range(0);
auto str = std::basic_string<CharT>(2 * size, CharT('*'));
Container output(size, CharT('-'));
for (auto _ : state)
benchmark::DoNotOptimize(std::format_to_n(std::begin(output), size, CSTR("{}"), str));
state.SetBytesProcessed(state.iterations() * size * sizeof(CharT));
}
/*** Pointer ***/
template <class CharT>
static void BM_format_to_n_string_span(benchmark::State& state) {
size_t size = state.range(0);
auto str = std::basic_string<CharT>(2 * size, CharT('*'));
auto buffer = std::basic_string<CharT>(size, CharT('-'));
std::span<CharT> output{buffer};
for (auto _ : state)
benchmark::DoNotOptimize(std::format_to_n(std::begin(output), size, CSTR("{}"), str));
state.SetBytesProcessed(state.iterations() * size * sizeof(CharT));
}
template <class CharT>
static void BM_format_to_n_string_pointer(benchmark::State& state) {
size_t size = state.range(0);
auto str = std::basic_string<CharT>(2 * size, CharT('*'));
auto buffer = std::basic_string<CharT>(size, CharT('-'));
CharT* output = buffer.data();
for (auto _ : state)
benchmark::DoNotOptimize(std::format_to_n(output, size, CSTR("{}"), str));
state.SetBytesProcessed(state.iterations() * size * sizeof(CharT));
}
/*** Main ***/
BENCHMARK(BM_format_to_n_string_back_inserter<std::string>)->RangeMultiplier(2)->Range(1, 1 << 20);
BENCHMARK(BM_format_to_n_string_back_inserter<std::vector<char>>)->RangeMultiplier(2)->Range(1, 1 << 20);
BENCHMARK(BM_format_to_n_string_back_inserter<std::list<char>>)->RangeMultiplier(2)->Range(1, 1 << 20);
BENCHMARK(BM_format_to_n_string_begin<std::string>)->RangeMultiplier(2)->Range(1, 1 << 20);
BENCHMARK(BM_format_to_n_string_begin<std::vector<char>>)->RangeMultiplier(2)->Range(1, 1 << 20);
BENCHMARK(BM_format_to_n_string_begin<std::list<char>>)->RangeMultiplier(2)->Range(1, 1 << 20);
BENCHMARK(BM_format_to_n_string_span<char>)->RangeMultiplier(2)->Range(1, 1 << 20);
BENCHMARK(BM_format_to_n_string_pointer<char>)->RangeMultiplier(2)->Range(1, 1 << 20);
#ifndef TEST_HAS_NO_WIDE_CHARACTERS
BENCHMARK(BM_format_to_n_string_back_inserter<std::wstring>)->RangeMultiplier(2)->Range(1, 1 << 20);
BENCHMARK(BM_format_to_n_string_back_inserter<std::vector<wchar_t>>)->RangeMultiplier(2)->Range(1, 1 << 20);
BENCHMARK(BM_format_to_n_string_back_inserter<std::list<wchar_t>>)->RangeMultiplier(2)->Range(1, 1 << 20);
BENCHMARK(BM_format_to_n_string_begin<std::wstring>)->RangeMultiplier(2)->Range(1, 1 << 20);
BENCHMARK(BM_format_to_n_string_begin<std::vector<wchar_t>>)->RangeMultiplier(2)->Range(1, 1 << 20);
BENCHMARK(BM_format_to_n_string_begin<std::list<wchar_t>>)->RangeMultiplier(2)->Range(1, 1 << 20);
BENCHMARK(BM_format_to_n_string_span<wchar_t>)->RangeMultiplier(2)->Range(1, 1 << 20);
BENCHMARK(BM_format_to_n_string_pointer<wchar_t>)->RangeMultiplier(2)->Range(1, 1 << 20);
#endif
BENCHMARK_MAIN();
|
