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-exception 6 // 7 //===----------------------------------------------------------------------===// 8 9 // UNSUPPORTED: c++03, c++11, c++14, c++17 10 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 21 template <class CharT> BM_format_string(benchmark::State & state)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 } 33 BENCHMARK(BM_format_string<char>)->RangeMultiplier(2)->Range(1, 1 << 20); 34 #ifndef TEST_HAS_NO_WIDE_CHARACTERS 35 BENCHMARK(BM_format_string<wchar_t>)->RangeMultiplier(2)->Range(1, 1 << 20); 36 #endif 37 38 BENCHMARK_MAIN(); 39