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author | Abseil Team <absl-team@google.com> | 2018-05-18 08:24:54 -0700 |
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committer | jueminyang <jueminyang@google.com> | 2018-05-18 11:41:24 -0400 |
commit | 59ae4d5a0e833bedd9d7cc059ac15a9dc130e3f7 (patch) | |
tree | 82dd664616de7ad63d1915da75adc9ed79e750d8 /absl/strings/str_cat_benchmark.cc | |
parent | 30de20488bb88dc22d23521c5c222ec6d924e289 (diff) |
- a4e14440b870dbf7b36975eaebf783a70a7fcee4 Release string_view microbenchmarks. by Alex Strelnikov <strel@google.com>
- 7cec68e37e16fb4e266368236ae1de6419f6946a Increase Abseil's minimum supported cmake version to 3.1.... by Jon Cohen <cohenjon@google.com>
- b977456175c8db380676bd56c44b32efbfc6f606 Fix a typo in the mutex.h comments. by Abseil Team <absl-team@google.com>
- 3d30cec131d08b066bc1cf877e4f661e8ee0584c Release StrSplit microbenchmarks. by Alex Strelnikov <strel@google.com>
- dddece6031feac1cca4689e623462f895f28d019 Release StrReplace microbenchmarks. by Alex Strelnikov <strel@google.com>
- ac3b40e1694f74bdcf31b8d1152481e92edfd441 Internal Change by Abseil Team <absl-team@google.com>
- d0e69ad6ddf0e59596a02ccab0253967f2909cdb Release StrCat microbenchmarks. by Alex Strelnikov <strel@google.com>
- db4d471030fa320d2b9d2ce241610333f0eb7a50 Release StrJoin microbenchmarks. by Alex Strelnikov <strel@google.com>
GitOrigin-RevId: a4e14440b870dbf7b36975eaebf783a70a7fcee4
Change-Id: I3f12700aafce677049f4d1a6e09ea821963a8c9e
Diffstat (limited to 'absl/strings/str_cat_benchmark.cc')
-rw-r--r-- | absl/strings/str_cat_benchmark.cc | 142 |
1 files changed, 142 insertions, 0 deletions
diff --git a/absl/strings/str_cat_benchmark.cc b/absl/strings/str_cat_benchmark.cc new file mode 100644 index 00000000..1791410c --- /dev/null +++ b/absl/strings/str_cat_benchmark.cc @@ -0,0 +1,142 @@ +// 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 +// +// http://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/str_cat.h" + +#include <cstdint> +#include <string> + +#include "benchmark/benchmark.h" +#include "absl/strings/substitute.h" + +namespace { + +const char kStringOne[] = "Once Upon A Time, "; +const char kStringTwo[] = "There was a std::string benchmark"; + +// We want to include negative numbers in the benchmark, so this function +// is used to count 0, 1, -1, 2, -2, 3, -3, ... +inline int IncrementAlternatingSign(int i) { + return i > 0 ? -i : 1 - i; +} + +void BM_Sum_By_StrCat(benchmark::State& state) { + int i = 0; + char foo[100]; + for (auto _ : state) { + // NOLINTNEXTLINE(runtime/printf) + strcpy(foo, absl::StrCat(kStringOne, i, kStringTwo, i * 65536ULL).c_str()); + int sum = 0; + for (char* f = &foo[0]; *f != 0; ++f) { + sum += *f; + } + benchmark::DoNotOptimize(sum); + i = IncrementAlternatingSign(i); + } +} +BENCHMARK(BM_Sum_By_StrCat); + +void BM_StrCat_By_snprintf(benchmark::State& state) { + int i = 0; + char on_stack[1000]; + for (auto _ : state) { + snprintf(on_stack, sizeof(on_stack), "%s %s:%d", kStringOne, kStringTwo, i); + i = IncrementAlternatingSign(i); + } +} +BENCHMARK(BM_StrCat_By_snprintf); + +void BM_StrCat_By_Strings(benchmark::State& state) { + int i = 0; + for (auto _ : state) { + std::string result = + std::string(kStringOne) + " " + kStringTwo + ":" + absl::StrCat(i); + benchmark::DoNotOptimize(result); + i = IncrementAlternatingSign(i); + } +} +BENCHMARK(BM_StrCat_By_Strings); + +void BM_StrCat_By_StringOpPlus(benchmark::State& state) { + int i = 0; + for (auto _ : state) { + std::string result = kStringOne; + result += " "; + result += kStringTwo; + result += ":"; + result += absl::StrCat(i); + benchmark::DoNotOptimize(result); + i = IncrementAlternatingSign(i); + } +} +BENCHMARK(BM_StrCat_By_StringOpPlus); + +void BM_StrCat_By_StrCat(benchmark::State& state) { + int i = 0; + for (auto _ : state) { + std::string result = absl::StrCat(kStringOne, " ", kStringTwo, ":", i); + benchmark::DoNotOptimize(result); + i = IncrementAlternatingSign(i); + } +} +BENCHMARK(BM_StrCat_By_StrCat); + +void BM_HexCat_By_StrCat(benchmark::State& state) { + int i = 0; + for (auto _ : state) { + std::string result = + absl::StrCat(kStringOne, " ", absl::Hex(int64_t{i} + 0x10000000)); + benchmark::DoNotOptimize(result); + i = IncrementAlternatingSign(i); + } +} +BENCHMARK(BM_HexCat_By_StrCat); + +void BM_HexCat_By_Substitute(benchmark::State& state) { + int i = 0; + for (auto _ : state) { + std::string result = absl::Substitute( + "$0 $1", kStringOne, reinterpret_cast<void*>(int64_t{i} + 0x10000000)); + benchmark::DoNotOptimize(result); + i = IncrementAlternatingSign(i); + } +} +BENCHMARK(BM_HexCat_By_Substitute); + +void BM_FloatToString_By_StrCat(benchmark::State& state) { + int i = 0; + float foo = 0.0f; + for (auto _ : state) { + std::string result = absl::StrCat(foo += 1.001f, " != ", int64_t{i}); + benchmark::DoNotOptimize(result); + i = IncrementAlternatingSign(i); + } +} +BENCHMARK(BM_FloatToString_By_StrCat); + +void BM_DoubleToString_By_SixDigits(benchmark::State& state) { + int i = 0; + double foo = 0.0; + for (auto _ : state) { + std::string result = + absl::StrCat(absl::SixDigits(foo += 1.001), " != ", int64_t{i}); + benchmark::DoNotOptimize(result); + i = IncrementAlternatingSign(i); + } +} +BENCHMARK(BM_DoubleToString_By_SixDigits); + +} // namespace + +BENCHMARK_MAIN(); |