fc8dc48020
git-subtree-dir: third_party/abseil_cpp git-subtree-mainline:ffb2ae54begit-subtree-split:768eb2ca28
140 lines
3.9 KiB
C++
140 lines
3.9 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/str_cat.h"
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#include <cstdint>
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#include <string>
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#include "benchmark/benchmark.h"
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#include "absl/strings/substitute.h"
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namespace {
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const char kStringOne[] = "Once Upon A Time, ";
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const char kStringTwo[] = "There was a string benchmark";
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// We want to include negative numbers in the benchmark, so this function
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// is used to count 0, 1, -1, 2, -2, 3, -3, ...
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inline int IncrementAlternatingSign(int i) {
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return i > 0 ? -i : 1 - i;
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}
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void BM_Sum_By_StrCat(benchmark::State& state) {
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int i = 0;
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char foo[100];
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for (auto _ : state) {
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// NOLINTNEXTLINE(runtime/printf)
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strcpy(foo, absl::StrCat(kStringOne, i, kStringTwo, i * 65536ULL).c_str());
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int sum = 0;
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for (char* f = &foo[0]; *f != 0; ++f) {
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sum += *f;
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}
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benchmark::DoNotOptimize(sum);
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i = IncrementAlternatingSign(i);
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}
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}
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BENCHMARK(BM_Sum_By_StrCat);
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void BM_StrCat_By_snprintf(benchmark::State& state) {
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int i = 0;
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char on_stack[1000];
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for (auto _ : state) {
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snprintf(on_stack, sizeof(on_stack), "%s %s:%d", kStringOne, kStringTwo, i);
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i = IncrementAlternatingSign(i);
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}
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}
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BENCHMARK(BM_StrCat_By_snprintf);
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void BM_StrCat_By_Strings(benchmark::State& state) {
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int i = 0;
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for (auto _ : state) {
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std::string result =
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std::string(kStringOne) + " " + kStringTwo + ":" + absl::StrCat(i);
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benchmark::DoNotOptimize(result);
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i = IncrementAlternatingSign(i);
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}
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}
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BENCHMARK(BM_StrCat_By_Strings);
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void BM_StrCat_By_StringOpPlus(benchmark::State& state) {
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int i = 0;
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for (auto _ : state) {
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std::string result = kStringOne;
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result += " ";
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result += kStringTwo;
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result += ":";
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result += absl::StrCat(i);
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benchmark::DoNotOptimize(result);
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i = IncrementAlternatingSign(i);
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}
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}
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BENCHMARK(BM_StrCat_By_StringOpPlus);
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void BM_StrCat_By_StrCat(benchmark::State& state) {
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int i = 0;
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for (auto _ : state) {
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std::string result = absl::StrCat(kStringOne, " ", kStringTwo, ":", i);
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benchmark::DoNotOptimize(result);
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i = IncrementAlternatingSign(i);
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}
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}
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BENCHMARK(BM_StrCat_By_StrCat);
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void BM_HexCat_By_StrCat(benchmark::State& state) {
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int i = 0;
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for (auto _ : state) {
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std::string result =
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absl::StrCat(kStringOne, " ", absl::Hex(int64_t{i} + 0x10000000));
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benchmark::DoNotOptimize(result);
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i = IncrementAlternatingSign(i);
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}
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}
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BENCHMARK(BM_HexCat_By_StrCat);
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void BM_HexCat_By_Substitute(benchmark::State& state) {
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int i = 0;
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for (auto _ : state) {
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std::string result = absl::Substitute(
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"$0 $1", kStringOne, reinterpret_cast<void*>(int64_t{i} + 0x10000000));
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benchmark::DoNotOptimize(result);
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i = IncrementAlternatingSign(i);
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}
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}
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BENCHMARK(BM_HexCat_By_Substitute);
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void BM_FloatToString_By_StrCat(benchmark::State& state) {
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int i = 0;
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float foo = 0.0f;
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for (auto _ : state) {
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std::string result = absl::StrCat(foo += 1.001f, " != ", int64_t{i});
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benchmark::DoNotOptimize(result);
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i = IncrementAlternatingSign(i);
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}
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}
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BENCHMARK(BM_FloatToString_By_StrCat);
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void BM_DoubleToString_By_SixDigits(benchmark::State& state) {
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int i = 0;
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double foo = 0.0;
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for (auto _ : state) {
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std::string result =
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absl::StrCat(absl::SixDigits(foo += 1.001), " != ", int64_t{i});
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benchmark::DoNotOptimize(result);
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i = IncrementAlternatingSign(i);
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}
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}
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BENCHMARK(BM_DoubleToString_By_SixDigits);
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} // namespace
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