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//===----------------------------------------------------------------------===//
//
// 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_string_back_inserter(benchmark::State& state) {
using CharT = typename Container::value_type;
size_t size = state.range(0);
auto str = std::basic_string<CharT>(size, CharT('*'));
for (auto _ : state) {
Container output;
benchmark::DoNotOptimize(std::format_to(std::back_inserter(output), CSTR("{}"), str));
}
state.SetBytesProcessed(state.iterations() * size * sizeof(CharT));
}
/*** Begin ***/
template <class Container>
static void BM_format_to_string_begin(benchmark::State& state) {
using CharT = typename Container::value_type;
size_t size = state.range(0);
auto str = std::basic_string<CharT>(size, CharT('*'));
Container output(size, CharT('-'));
for (auto _ : state)
benchmark::DoNotOptimize(std::format_to(std::begin(output), CSTR("{}"), str));
state.SetBytesProcessed(state.iterations() * size * sizeof(CharT));
}
/*** Pointer ***/
template <class CharT>
static void BM_format_to_string_span(benchmark::State& state) {
size_t size = state.range(0);
auto str = std::basic_string<CharT>(size, CharT('*'));
auto buffer = std::basic_string<CharT>(size, CharT('-'));
std::span<CharT> output{buffer};
for (auto _ : state)
benchmark::DoNotOptimize(std::format_to(std::begin(output), CSTR("{}"), str));
state.SetBytesProcessed(state.iterations() * size * sizeof(CharT));
}
template <class CharT>
static void BM_format_to_string_pointer(benchmark::State& state) {
size_t size = state.range(0);
auto str = std::basic_string<CharT>(size, CharT('*'));
auto buffer = std::basic_string<CharT>(size, CharT('-'));
CharT* output = buffer.data();
for (auto _ : state)
benchmark::DoNotOptimize(std::format_to(output, CSTR("{}"), str));
state.SetBytesProcessed(state.iterations() * size * sizeof(CharT));
}
/*** Main ***/
BENCHMARK(BM_format_to_string_back_inserter<std::string>)->RangeMultiplier(2)->Range(1, 1 << 20);
BENCHMARK(BM_format_to_string_back_inserter<std::vector<char>>)->RangeMultiplier(2)->Range(1, 1 << 20);
BENCHMARK(BM_format_to_string_back_inserter<std::list<char>>)->RangeMultiplier(2)->Range(1, 1 << 20);
BENCHMARK(BM_format_to_string_begin<std::string>)->RangeMultiplier(2)->Range(1, 1 << 20);
BENCHMARK(BM_format_to_string_begin<std::vector<char>>)->RangeMultiplier(2)->Range(1, 1 << 20);
BENCHMARK(BM_format_to_string_begin<std::list<char>>)->RangeMultiplier(2)->Range(1, 1 << 20);
BENCHMARK(BM_format_to_string_span<char>)->RangeMultiplier(2)->Range(1, 1 << 20);
BENCHMARK(BM_format_to_string_pointer<char>)->RangeMultiplier(2)->Range(1, 1 << 20);
#ifndef TEST_HAS_NO_WIDE_CHARACTERS
BENCHMARK(BM_format_to_string_back_inserter<std::wstring>)->RangeMultiplier(2)->Range(1, 1 << 20);
BENCHMARK(BM_format_to_string_back_inserter<std::vector<wchar_t>>)->RangeMultiplier(2)->Range(1, 1 << 20);
BENCHMARK(BM_format_to_string_back_inserter<std::list<wchar_t>>)->RangeMultiplier(2)->Range(1, 1 << 20);
BENCHMARK(BM_format_to_string_begin<std::wstring>)->RangeMultiplier(2)->Range(1, 1 << 20);
BENCHMARK(BM_format_to_string_begin<std::vector<wchar_t>>)->RangeMultiplier(2)->Range(1, 1 << 20);
BENCHMARK(BM_format_to_string_begin<std::list<wchar_t>>)->RangeMultiplier(2)->Range(1, 1 << 20);
BENCHMARK(BM_format_to_string_span<wchar_t>)->RangeMultiplier(2)->Range(1, 1 << 20);
BENCHMARK(BM_format_to_string_pointer<wchar_t>)->RangeMultiplier(2)->Range(1, 1 << 20);
#endif
BENCHMARK_MAIN();
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