50 lines · cpp
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-exception6//7//===----------------------------------------------------------------------===//8 9// UNSUPPORTED: c++03, c++11, c++14, c++1710 11#include <format>12 13#include <string>14 15#include "benchmark/benchmark.h"16#include "make_string.h"17#include "test_macros.h"18 19#define CSTR(S) MAKE_CSTRING(CharT, S)20 21template <class CharT>22static void BM_format_string(benchmark::State& state) {23 size_t size = state.range(0);24 std::basic_string<CharT> str(size, CharT('*'));25 26 while (state.KeepRunningBatch(str.size())) {27 std::basic_string<CharT> s = std::format(CSTR("{}"), str);28 benchmark::DoNotOptimize(s);29 }30 31 state.SetBytesProcessed(state.iterations() * size * sizeof(CharT));32}33BENCHMARK(BM_format_string<char>)->RangeMultiplier(2)->Range(1, 1 << 20);34#ifndef TEST_HAS_NO_WIDE_CHARACTERS35BENCHMARK(BM_format_string<wchar_t>)->RangeMultiplier(2)->Range(1, 1 << 20);36#endif37 38template <class CharT>39static void BM_string_without_formatting(benchmark::State& state) {40 for (auto _ : state) {41 benchmark::DoNotOptimize(std::format(CSTR("Hello, World!")));42 }43}44BENCHMARK(BM_string_without_formatting<char>);45#ifndef TEST_HAS_NO_WIDE_CHARACTERS46BENCHMARK(BM_string_without_formatting<wchar_t>);47#endif48 49BENCHMARK_MAIN();50