| // Copyright 2018 The Abseil Authors. |
| // |
| // Licensed under the Apache License, Version 2.0 (the "License"); |
| // you may not use this file except in compliance with the License. |
| // You may obtain a copy of the License at |
| // |
| // https://www.apache.org/licenses/LICENSE-2.0 |
| // |
| // Unless required by applicable law or agreed to in writing, software |
| // distributed under the License is distributed on an "AS IS" BASIS, |
| // WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. |
| // See the License for the specific language governing permissions and |
| // limitations under the License. |
| |
| #include "absl/strings/ascii.h" |
| |
| #include <cctype> |
| #include <string> |
| #include <array> |
| #include <random> |
| |
| #include "benchmark/benchmark.h" |
| |
| namespace { |
| |
| std::array<unsigned char, 256> MakeShuffledBytes() { |
| std::array<unsigned char, 256> bytes; |
| for (size_t i = 0; i < 256; ++i) bytes[i] = static_cast<unsigned char>(i); |
| std::random_device rd; |
| std::seed_seq seed({rd(), rd(), rd(), rd(), rd(), rd(), rd(), rd()}); |
| std::mt19937 g(seed); |
| std::shuffle(bytes.begin(), bytes.end(), g); |
| return bytes; |
| } |
| |
| template <typename Function> |
| void AsciiBenchmark(benchmark::State& state, Function f) { |
| std::array<unsigned char, 256> bytes = MakeShuffledBytes(); |
| size_t sum = 0; |
| for (auto _ : state) { |
| for (unsigned char b : bytes) sum += f(b) ? 1 : 0; |
| } |
| // Make a copy of `sum` before calling `DoNotOptimize` to make sure that `sum` |
| // can be put in a CPU register and not degrade performance in the loop above. |
| size_t sum2 = sum; |
| benchmark::DoNotOptimize(sum2); |
| state.SetBytesProcessed(state.iterations() * bytes.size()); |
| } |
| |
| using StdAsciiFunction = int (*)(int); |
| template <StdAsciiFunction f> |
| void BM_Ascii(benchmark::State& state) { |
| AsciiBenchmark(state, f); |
| } |
| |
| using AbslAsciiIsFunction = bool (*)(unsigned char); |
| template <AbslAsciiIsFunction f> |
| void BM_Ascii(benchmark::State& state) { |
| AsciiBenchmark(state, f); |
| } |
| |
| using AbslAsciiToFunction = char (*)(unsigned char); |
| template <AbslAsciiToFunction f> |
| void BM_Ascii(benchmark::State& state) { |
| AsciiBenchmark(state, f); |
| } |
| |
| inline char Noop(unsigned char b) { return static_cast<char>(b); } |
| |
| BENCHMARK_TEMPLATE(BM_Ascii, Noop); |
| BENCHMARK_TEMPLATE(BM_Ascii, std::isalpha); |
| BENCHMARK_TEMPLATE(BM_Ascii, absl::ascii_isalpha); |
| BENCHMARK_TEMPLATE(BM_Ascii, std::isdigit); |
| BENCHMARK_TEMPLATE(BM_Ascii, absl::ascii_isdigit); |
| BENCHMARK_TEMPLATE(BM_Ascii, std::isalnum); |
| BENCHMARK_TEMPLATE(BM_Ascii, absl::ascii_isalnum); |
| BENCHMARK_TEMPLATE(BM_Ascii, std::isspace); |
| BENCHMARK_TEMPLATE(BM_Ascii, absl::ascii_isspace); |
| BENCHMARK_TEMPLATE(BM_Ascii, std::ispunct); |
| BENCHMARK_TEMPLATE(BM_Ascii, absl::ascii_ispunct); |
| BENCHMARK_TEMPLATE(BM_Ascii, std::isblank); |
| BENCHMARK_TEMPLATE(BM_Ascii, absl::ascii_isblank); |
| BENCHMARK_TEMPLATE(BM_Ascii, std::iscntrl); |
| BENCHMARK_TEMPLATE(BM_Ascii, absl::ascii_iscntrl); |
| BENCHMARK_TEMPLATE(BM_Ascii, std::isxdigit); |
| BENCHMARK_TEMPLATE(BM_Ascii, absl::ascii_isxdigit); |
| BENCHMARK_TEMPLATE(BM_Ascii, std::isprint); |
| BENCHMARK_TEMPLATE(BM_Ascii, absl::ascii_isprint); |
| BENCHMARK_TEMPLATE(BM_Ascii, std::isgraph); |
| BENCHMARK_TEMPLATE(BM_Ascii, absl::ascii_isgraph); |
| BENCHMARK_TEMPLATE(BM_Ascii, std::isupper); |
| BENCHMARK_TEMPLATE(BM_Ascii, absl::ascii_isupper); |
| BENCHMARK_TEMPLATE(BM_Ascii, std::islower); |
| BENCHMARK_TEMPLATE(BM_Ascii, absl::ascii_islower); |
| BENCHMARK_TEMPLATE(BM_Ascii, isascii); |
| BENCHMARK_TEMPLATE(BM_Ascii, absl::ascii_isascii); |
| BENCHMARK_TEMPLATE(BM_Ascii, std::tolower); |
| BENCHMARK_TEMPLATE(BM_Ascii, absl::ascii_tolower); |
| BENCHMARK_TEMPLATE(BM_Ascii, std::toupper); |
| BENCHMARK_TEMPLATE(BM_Ascii, absl::ascii_toupper); |
| |
| static void BM_StrToLower(benchmark::State& state) { |
| const int size = state.range(0); |
| std::string s(size, 'X'); |
| for (auto _ : state) { |
| benchmark::DoNotOptimize(absl::AsciiStrToLower(s)); |
| } |
| } |
| BENCHMARK(BM_StrToLower)->Range(1, 1 << 20); |
| |
| static void BM_StrToUpper(benchmark::State& state) { |
| const int size = state.range(0); |
| std::string s(size, 'x'); |
| for (auto _ : state) { |
| benchmark::DoNotOptimize(absl::AsciiStrToUpper(s)); |
| } |
| } |
| BENCHMARK(BM_StrToUpper)->Range(1, 1 << 20); |
| |
| } // namespace |