fc8dc48020
git-subtree-dir: third_party/abseil_cpp git-subtree-mainline:ffb2ae54begit-subtree-split:768eb2ca28
120 lines
4 KiB
C++
120 lines
4 KiB
C++
// Copyright 2018 The Abseil Authors.
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//
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// Licensed under the Apache License, Version 2.0 (the "License");
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// you may not use this file except in compliance with the License.
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// You may obtain a copy of the License at
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//
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// https://www.apache.org/licenses/LICENSE-2.0
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//
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// Unless required by applicable law or agreed to in writing, software
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// distributed under the License is distributed on an "AS IS" BASIS,
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// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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// See the License for the specific language governing permissions and
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// limitations under the License.
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#include "absl/strings/ascii.h"
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#include <cctype>
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#include <string>
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#include <array>
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#include <random>
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#include "benchmark/benchmark.h"
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namespace {
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std::array<unsigned char, 256> MakeShuffledBytes() {
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std::array<unsigned char, 256> bytes;
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for (size_t i = 0; i < 256; ++i) bytes[i] = static_cast<unsigned char>(i);
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std::random_device rd;
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std::seed_seq seed({rd(), rd(), rd(), rd(), rd(), rd(), rd(), rd()});
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std::mt19937 g(seed);
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std::shuffle(bytes.begin(), bytes.end(), g);
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return bytes;
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}
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template <typename Function>
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void AsciiBenchmark(benchmark::State& state, Function f) {
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std::array<unsigned char, 256> bytes = MakeShuffledBytes();
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size_t sum = 0;
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for (auto _ : state) {
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for (unsigned char b : bytes) sum += f(b) ? 1 : 0;
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}
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// Make a copy of `sum` before calling `DoNotOptimize` to make sure that `sum`
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// can be put in a CPU register and not degrade performance in the loop above.
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size_t sum2 = sum;
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benchmark::DoNotOptimize(sum2);
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state.SetBytesProcessed(state.iterations() * bytes.size());
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}
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using StdAsciiFunction = int (*)(int);
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template <StdAsciiFunction f>
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void BM_Ascii(benchmark::State& state) {
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AsciiBenchmark(state, f);
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}
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using AbslAsciiIsFunction = bool (*)(unsigned char);
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template <AbslAsciiIsFunction f>
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void BM_Ascii(benchmark::State& state) {
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AsciiBenchmark(state, f);
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}
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using AbslAsciiToFunction = char (*)(unsigned char);
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template <AbslAsciiToFunction f>
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void BM_Ascii(benchmark::State& state) {
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AsciiBenchmark(state, f);
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}
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inline char Noop(unsigned char b) { return static_cast<char>(b); }
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BENCHMARK_TEMPLATE(BM_Ascii, Noop);
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BENCHMARK_TEMPLATE(BM_Ascii, std::isalpha);
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BENCHMARK_TEMPLATE(BM_Ascii, absl::ascii_isalpha);
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BENCHMARK_TEMPLATE(BM_Ascii, std::isdigit);
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BENCHMARK_TEMPLATE(BM_Ascii, absl::ascii_isdigit);
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BENCHMARK_TEMPLATE(BM_Ascii, std::isalnum);
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BENCHMARK_TEMPLATE(BM_Ascii, absl::ascii_isalnum);
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BENCHMARK_TEMPLATE(BM_Ascii, std::isspace);
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BENCHMARK_TEMPLATE(BM_Ascii, absl::ascii_isspace);
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BENCHMARK_TEMPLATE(BM_Ascii, std::ispunct);
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BENCHMARK_TEMPLATE(BM_Ascii, absl::ascii_ispunct);
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BENCHMARK_TEMPLATE(BM_Ascii, std::isblank);
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BENCHMARK_TEMPLATE(BM_Ascii, absl::ascii_isblank);
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BENCHMARK_TEMPLATE(BM_Ascii, std::iscntrl);
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BENCHMARK_TEMPLATE(BM_Ascii, absl::ascii_iscntrl);
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BENCHMARK_TEMPLATE(BM_Ascii, std::isxdigit);
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BENCHMARK_TEMPLATE(BM_Ascii, absl::ascii_isxdigit);
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BENCHMARK_TEMPLATE(BM_Ascii, std::isprint);
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BENCHMARK_TEMPLATE(BM_Ascii, absl::ascii_isprint);
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BENCHMARK_TEMPLATE(BM_Ascii, std::isgraph);
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BENCHMARK_TEMPLATE(BM_Ascii, absl::ascii_isgraph);
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BENCHMARK_TEMPLATE(BM_Ascii, std::isupper);
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BENCHMARK_TEMPLATE(BM_Ascii, absl::ascii_isupper);
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BENCHMARK_TEMPLATE(BM_Ascii, std::islower);
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BENCHMARK_TEMPLATE(BM_Ascii, absl::ascii_islower);
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BENCHMARK_TEMPLATE(BM_Ascii, isascii);
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BENCHMARK_TEMPLATE(BM_Ascii, absl::ascii_isascii);
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BENCHMARK_TEMPLATE(BM_Ascii, std::tolower);
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BENCHMARK_TEMPLATE(BM_Ascii, absl::ascii_tolower);
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BENCHMARK_TEMPLATE(BM_Ascii, std::toupper);
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BENCHMARK_TEMPLATE(BM_Ascii, absl::ascii_toupper);
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static void BM_StrToLower(benchmark::State& state) {
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const int size = state.range(0);
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std::string s(size, 'X');
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for (auto _ : state) {
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benchmark::DoNotOptimize(absl::AsciiStrToLower(s));
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}
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}
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BENCHMARK(BM_StrToLower)->Range(1, 1 << 20);
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static void BM_StrToUpper(benchmark::State& state) {
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const int size = state.range(0);
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std::string s(size, 'x');
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for (auto _ : state) {
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benchmark::DoNotOptimize(absl::AsciiStrToUpper(s));
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}
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}
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BENCHMARK(BM_StrToUpper)->Range(1, 1 << 20);
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} // namespace
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