libcxx/benchmarks/format.bench.cpp

   1 //===----------------------------------------------------------------------===//
   2 // Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
   3 // See https://llvm.org/LICENSE.txt for license information.
   4 // SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
   5 //
   6 //===----------------------------------------------------------------------===//
   7
   8 #include <format>
   9
  10 #include <string>
  11
  12 #include "benchmark/benchmark.h"
  13 #include "make_string.h"
  14
  15 #define CSTR(S) MAKE_CSTRING(CharT, S)
  16
  17 template <class CharT>
  18 static void BM_format_string(benchmark::State& state) {
  19   size_t size = state.range(0);
  20   std::basic_string<CharT> str(size, CharT('*'));
  21
  22   while (state.KeepRunningBatch(str.size()))
  23     benchmark::DoNotOptimize(std::format(CSTR("{}"), str));
  24
  25   state.SetBytesProcessed(state.iterations() * size * sizeof(CharT));
  26 }
  27 BENCHMARK_TEMPLATE(BM_format_string, char)->RangeMultiplier(2)->Range(1, 1 << 20);
  28 BENCHMARK_TEMPLATE(BM_format_string, wchar_t)->RangeMultiplier(2)->Range(1, 1 << 20);
  29
  30 int main(int argc, char** argv) {
  31   benchmark::Initialize(&argc, argv);
  32   if (benchmark::ReportUnrecognizedArguments(argc, argv))
  33     return 1;
  34
  35   benchmark::RunSpecifiedBenchmarks();
  36 }