d54b1cfa38
This patch is the start of a series to improve the speed of std::format, std::format_to, std::format_to_n, and std::formatted_size. This is mostly achieved by changing the __output_buffer class. This new __output_buffer class also makes it easier to implement buffering for P3107R5 "Permit an efficient implementation of std::print"
34 lines
1.0 KiB
C++
34 lines
1.0 KiB
C++
//===----------------------------------------------------------------------===//
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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 <string>
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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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template <class CharT>
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static void BM_format_string(benchmark::State& state) {
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size_t size = state.range(0);
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std::basic_string<CharT> str(size, CharT('*'));
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while (state.KeepRunningBatch(str.size())) {
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std::basic_string<CharT> s = std::format(CSTR("{}"), str);
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benchmark::DoNotOptimize(s);
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}
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state.SetBytesProcessed(state.iterations() * size * sizeof(CharT));
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}
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BENCHMARK(BM_format_string<char>)->RangeMultiplier(2)->Range(1, 1 << 20);
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BENCHMARK(BM_format_string<wchar_t>)->RangeMultiplier(2)->Range(1, 1 << 20);
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BENCHMARK_MAIN();
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