llvm-project

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//===----------------------------------------------------------------------===//
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// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
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// See https://llvm.org/LICENSE.txt for license information.
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// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
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//
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//===----------------------------------------------------------------------===//
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#include <format>
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#include <algorithm>
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#include <array>
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#include <iterator>
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#include <list>
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#include <span>
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#include <string>
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#include <vector>
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#include "benchmark/benchmark.h"
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#include "make_string.h"
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#define CSTR(S) MAKE_CSTRING(CharT, S)
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/*** Back inserter ***/
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template <class Container>
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static void BM_format_to_n_string_back_inserter(benchmark::State& state) {
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  using CharT = typename Container::value_type;
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  size_t size = state.range(0);
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  auto str    = std::basic_string<CharT>(2 * size, CharT('*'));
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  for (auto _ : state) {
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    Container output;
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    benchmark::DoNotOptimize(std::format_to_n(std::back_inserter(output), size, CSTR("{}"), str));
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  }
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  state.SetBytesProcessed(state.iterations() * size * sizeof(CharT));
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}
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/*** Begin ***/
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template <class Container>
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static void BM_format_to_n_string_begin(benchmark::State& state) {
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  using CharT = typename Container::value_type;
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  size_t size = state.range(0);
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  auto str    = std::basic_string<CharT>(2 * size, CharT('*'));
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  Container output(size, CharT('-'));
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  for (auto _ : state)
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    benchmark::DoNotOptimize(std::format_to_n(std::begin(output), size, CSTR("{}"), str));
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  state.SetBytesProcessed(state.iterations() * size * sizeof(CharT));
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}
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/*** Pointer ***/
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template <class CharT>
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static void BM_format_to_n_string_span(benchmark::State& state) {
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  size_t size = state.range(0);
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  auto str    = std::basic_string<CharT>(2 * size, CharT('*'));
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  auto buffer = std::basic_string<CharT>(size, CharT('-'));
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  std::span<CharT> output{buffer};
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  for (auto _ : state)
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    benchmark::DoNotOptimize(std::format_to_n(std::begin(output), size, CSTR("{}"), str));
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  state.SetBytesProcessed(state.iterations() * size * sizeof(CharT));
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}
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template <class CharT>
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static void BM_format_to_n_string_pointer(benchmark::State& state) {
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  size_t size = state.range(0);
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  auto str    = std::basic_string<CharT>(2 * size, CharT('*'));
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  auto buffer   = std::basic_string<CharT>(size, CharT('-'));
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  CharT* output = buffer.data();
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  for (auto _ : state)
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    benchmark::DoNotOptimize(std::format_to_n(output, size, CSTR("{}"), str));
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  state.SetBytesProcessed(state.iterations() * size * sizeof(CharT));
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}
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/*** Main ***/
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BENCHMARK_TEMPLATE(BM_format_to_n_string_back_inserter, std::string)->RangeMultiplier(2)->Range(1, 1 << 20);
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BENCHMARK_TEMPLATE(BM_format_to_n_string_back_inserter, std::vector<char>)->RangeMultiplier(2)->Range(1, 1 << 20);
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BENCHMARK_TEMPLATE(BM_format_to_n_string_back_inserter, std::list<char>)->RangeMultiplier(2)->Range(1, 1 << 20);
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BENCHMARK_TEMPLATE(BM_format_to_n_string_begin, std::string)->RangeMultiplier(2)->Range(1, 1 << 20);
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BENCHMARK_TEMPLATE(BM_format_to_n_string_begin, std::vector<char>)->RangeMultiplier(2)->Range(1, 1 << 20);
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BENCHMARK_TEMPLATE(BM_format_to_n_string_begin, std::list<char>)->RangeMultiplier(2)->Range(1, 1 << 20);
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BENCHMARK_TEMPLATE(BM_format_to_n_string_span, char)->RangeMultiplier(2)->Range(1, 1 << 20);
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BENCHMARK_TEMPLATE(BM_format_to_n_string_pointer, char)->RangeMultiplier(2)->Range(1, 1 << 20);
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BENCHMARK_TEMPLATE(BM_format_to_n_string_back_inserter, std::wstring)->RangeMultiplier(2)->Range(1, 1 << 20);
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BENCHMARK_TEMPLATE(BM_format_to_n_string_back_inserter, std::vector<wchar_t>)->RangeMultiplier(2)->Range(1, 1 << 20);
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BENCHMARK_TEMPLATE(BM_format_to_n_string_back_inserter, std::list<wchar_t>)->RangeMultiplier(2)->Range(1, 1 << 20);
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BENCHMARK_TEMPLATE(BM_format_to_n_string_begin, std::wstring)->RangeMultiplier(2)->Range(1, 1 << 20);
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BENCHMARK_TEMPLATE(BM_format_to_n_string_begin, std::vector<wchar_t>)->RangeMultiplier(2)->Range(1, 1 << 20);
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BENCHMARK_TEMPLATE(BM_format_to_n_string_begin, std::list<wchar_t>)->RangeMultiplier(2)->Range(1, 1 << 20);
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BENCHMARK_TEMPLATE(BM_format_to_n_string_span, wchar_t)->RangeMultiplier(2)->Range(1, 1 << 20);
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BENCHMARK_TEMPLATE(BM_format_to_n_string_pointer, wchar_t)->RangeMultiplier(2)->Range(1, 1 << 20);
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int main(int argc, char** argv) {
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  benchmark::Initialize(&argc, argv);
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  if (benchmark::ReportUnrecognizedArguments(argc, argv))
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    return 1;
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  benchmark::RunSpecifiedBenchmarks();
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}
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