diff options
Diffstat (limited to 'third_party/abseil_cpp/absl/strings/charconv_benchmark.cc')
| -rw-r--r-- | third_party/abseil_cpp/absl/strings/charconv_benchmark.cc | 204 |
1 files changed, 0 insertions, 204 deletions
diff --git a/third_party/abseil_cpp/absl/strings/charconv_benchmark.cc b/third_party/abseil_cpp/absl/strings/charconv_benchmark.cc deleted file mode 100644 index e8c7371d65..0000000000 --- a/third_party/abseil_cpp/absl/strings/charconv_benchmark.cc +++ /dev/null @@ -1,204 +0,0 @@ -// 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/charconv.h" - -#include <cstdlib> -#include <cstring> -#include <string> - -#include "benchmark/benchmark.h" - -namespace { - -void BM_Strtod_Pi(benchmark::State& state) { - const char* pi = "3.14159"; - for (auto s : state) { - benchmark::DoNotOptimize(pi); - benchmark::DoNotOptimize(strtod(pi, nullptr)); - } -} -BENCHMARK(BM_Strtod_Pi); - -void BM_Absl_Pi(benchmark::State& state) { - const char* pi = "3.14159"; - const char* pi_end = pi + strlen(pi); - for (auto s : state) { - benchmark::DoNotOptimize(pi); - double v; - absl::from_chars(pi, pi_end, v); - benchmark::DoNotOptimize(v); - } -} -BENCHMARK(BM_Absl_Pi); - -void BM_Strtod_Pi_float(benchmark::State& state) { - const char* pi = "3.14159"; - for (auto s : state) { - benchmark::DoNotOptimize(pi); - benchmark::DoNotOptimize(strtof(pi, nullptr)); - } -} -BENCHMARK(BM_Strtod_Pi_float); - -void BM_Absl_Pi_float(benchmark::State& state) { - const char* pi = "3.14159"; - const char* pi_end = pi + strlen(pi); - for (auto s : state) { - benchmark::DoNotOptimize(pi); - float v; - absl::from_chars(pi, pi_end, v); - benchmark::DoNotOptimize(v); - } -} -BENCHMARK(BM_Absl_Pi_float); - -void BM_Strtod_HardLarge(benchmark::State& state) { - const char* num = "272104041512242479.e200"; - for (auto s : state) { - benchmark::DoNotOptimize(num); - benchmark::DoNotOptimize(strtod(num, nullptr)); - } -} -BENCHMARK(BM_Strtod_HardLarge); - -void BM_Absl_HardLarge(benchmark::State& state) { - const char* numstr = "272104041512242479.e200"; - const char* numstr_end = numstr + strlen(numstr); - for (auto s : state) { - benchmark::DoNotOptimize(numstr); - double v; - absl::from_chars(numstr, numstr_end, v); - benchmark::DoNotOptimize(v); - } -} -BENCHMARK(BM_Absl_HardLarge); - -void BM_Strtod_HardSmall(benchmark::State& state) { - const char* num = "94080055902682397.e-242"; - for (auto s : state) { - benchmark::DoNotOptimize(num); - benchmark::DoNotOptimize(strtod(num, nullptr)); - } -} -BENCHMARK(BM_Strtod_HardSmall); - -void BM_Absl_HardSmall(benchmark::State& state) { - const char* numstr = "94080055902682397.e-242"; - const char* numstr_end = numstr + strlen(numstr); - for (auto s : state) { - benchmark::DoNotOptimize(numstr); - double v; - absl::from_chars(numstr, numstr_end, v); - benchmark::DoNotOptimize(v); - } -} -BENCHMARK(BM_Absl_HardSmall); - -void BM_Strtod_HugeMantissa(benchmark::State& state) { - std::string huge(200, '3'); - const char* num = huge.c_str(); - for (auto s : state) { - benchmark::DoNotOptimize(num); - benchmark::DoNotOptimize(strtod(num, nullptr)); - } -} -BENCHMARK(BM_Strtod_HugeMantissa); - -void BM_Absl_HugeMantissa(benchmark::State& state) { - std::string huge(200, '3'); - const char* num = huge.c_str(); - const char* num_end = num + 200; - for (auto s : state) { - benchmark::DoNotOptimize(num); - double v; - absl::from_chars(num, num_end, v); - benchmark::DoNotOptimize(v); - } -} -BENCHMARK(BM_Absl_HugeMantissa); - -std::string MakeHardCase(int length) { - // The number 1.1521...e-297 is exactly halfway between 12345 * 2**-1000 and - // the next larger representable number. The digits of this number are in - // the string below. - const std::string digits = - "1." - "152113937042223790993097181572444900347587985074226836242307364987727724" - "831384300183638649152607195040591791364113930628852279348613864894524591" - "272746490313676832900762939595690019745859128071117417798540258114233761" - "012939937017879509401007964861774960297319002612457273148497158989073482" - "171377406078223015359818300988676687994537274548940612510414856761641652" - "513434981938564294004070500716200446656421722229202383105446378511678258" - "370570631774499359748259931676320916632111681001853983492795053244971606" - "922718923011680846577744433974087653954904214152517799883551075537146316" - "168973685866425605046988661997658648354773076621610279716804960009043764" - "038392994055171112475093876476783502487512538082706095923790634572014823" - "78877699375152587890625" + - std::string(5000, '0'); - // generate the hard cases on either side for the given length. - // Lengths between 3 and 1000 are reasonable. - return digits.substr(0, length) + "1e-297"; -} - -void BM_Strtod_Big_And_Difficult(benchmark::State& state) { - std::string testcase = MakeHardCase(state.range(0)); - const char* begin = testcase.c_str(); - for (auto s : state) { - benchmark::DoNotOptimize(begin); - benchmark::DoNotOptimize(strtod(begin, nullptr)); - } -} -BENCHMARK(BM_Strtod_Big_And_Difficult)->Range(3, 5000); - -void BM_Absl_Big_And_Difficult(benchmark::State& state) { - std::string testcase = MakeHardCase(state.range(0)); - const char* begin = testcase.c_str(); - const char* end = begin + testcase.size(); - for (auto s : state) { - benchmark::DoNotOptimize(begin); - double v; - absl::from_chars(begin, end, v); - benchmark::DoNotOptimize(v); - } -} -BENCHMARK(BM_Absl_Big_And_Difficult)->Range(3, 5000); - -} // namespace - -// ------------------------------------------------------------------------ -// Benchmark Time CPU Iterations -// ------------------------------------------------------------------------ -// BM_Strtod_Pi 96 ns 96 ns 6337454 -// BM_Absl_Pi 35 ns 35 ns 20031996 -// BM_Strtod_Pi_float 91 ns 91 ns 7745851 -// BM_Absl_Pi_float 35 ns 35 ns 20430298 -// BM_Strtod_HardLarge 133 ns 133 ns 5288341 -// BM_Absl_HardLarge 181 ns 181 ns 3855615 -// BM_Strtod_HardSmall 279 ns 279 ns 2517243 -// BM_Absl_HardSmall 287 ns 287 ns 2458744 -// BM_Strtod_HugeMantissa 433 ns 433 ns 1604293 -// BM_Absl_HugeMantissa 160 ns 160 ns 4403671 -// BM_Strtod_Big_And_Difficult/3 236 ns 236 ns 2942496 -// BM_Strtod_Big_And_Difficult/8 232 ns 232 ns 2983796 -// BM_Strtod_Big_And_Difficult/64 437 ns 437 ns 1591951 -// BM_Strtod_Big_And_Difficult/512 1738 ns 1738 ns 402519 -// BM_Strtod_Big_And_Difficult/4096 3943 ns 3943 ns 176128 -// BM_Strtod_Big_And_Difficult/5000 4397 ns 4397 ns 157878 -// BM_Absl_Big_And_Difficult/3 39 ns 39 ns 17799583 -// BM_Absl_Big_And_Difficult/8 43 ns 43 ns 16096859 -// BM_Absl_Big_And_Difficult/64 550 ns 550 ns 1259717 -// BM_Absl_Big_And_Difficult/512 4167 ns 4167 ns 171414 -// BM_Absl_Big_And_Difficult/4096 9160 ns 9159 ns 76297 -// BM_Absl_Big_And_Difficult/5000 9738 ns 9738 ns 70140 |