libcxx/benchmarks/formatted_size.bench.cpp

//===----------------------------------------------------------------------===//
// 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
//
//===----------------------------------------------------------------------===//

#include <format>

#include <string>

#include "benchmark/benchmark.h"
#include "make_string.h"

#define CSTR(S) MAKE_CSTRING(CharT, S)

template <class CharT>
static void BM_formatted_size_string(benchmark::State& state) {
  size_t size = state.range(0);
  std::basic_string<CharT> str(size, CharT('*'));

  while (state.KeepRunningBatch(str.size()))
    benchmark::DoNotOptimize(std::formatted_size(CSTR("{}"), str));

  state.SetBytesProcessed(state.iterations() * size * sizeof(CharT));
}
BENCHMARK_TEMPLATE(BM_formatted_size_string, char)->RangeMultiplier(2)->Range(1, 1 << 20);
BENCHMARK_TEMPLATE(BM_formatted_size_string, wchar_t)->RangeMultiplier(2)->Range(1, 1 << 20);

int main(int argc, char** argv) {
  benchmark::Initialize(&argc, argv);
  if (benchmark::ReportUnrecognizedArguments(argc, argv))
    return 1;

  benchmark::RunSpecifiedBenchmarks();
}