From b5fb0582b5bb46d622271a7db61e28ff19ae928c Mon Sep 17 00:00:00 2001 From: Derek Mauro Date: Fri, 20 Oct 2023 12:49:11 -0700 Subject: Use STL algorithms available since C++14 to implement absl::equal and absl::rotate. Prior to C++14 these were either polyfills or fixes for bugs in standard libraries. PiperOrigin-RevId: 575295101 Change-Id: Ie01e77fedadc879c73203d71babd40c87a419af3 --- absl/algorithm/equal_benchmark.cc | 126 -------------------------------------- 1 file changed, 126 deletions(-) delete mode 100644 absl/algorithm/equal_benchmark.cc (limited to 'absl/algorithm/equal_benchmark.cc') diff --git a/absl/algorithm/equal_benchmark.cc b/absl/algorithm/equal_benchmark.cc deleted file mode 100644 index 948cd65c..00000000 --- a/absl/algorithm/equal_benchmark.cc +++ /dev/null @@ -1,126 +0,0 @@ -// Copyright 2017 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 -#include - -#include "absl/algorithm/algorithm.h" -#include "benchmark/benchmark.h" - -namespace { - -// The range of sequence sizes to benchmark. -constexpr int kMinBenchmarkSize = 1024; -constexpr int kMaxBenchmarkSize = 8 * 1024 * 1024; - -// A user-defined type for use in equality benchmarks. Note that we expect -// std::memcmp to win for this type: libstdc++'s std::equal only defers to -// memcmp for integral types. This is because it is not straightforward to -// guarantee that std::memcmp would produce a result "as-if" compared by -// operator== for other types (example gotchas: NaN floats, structs with -// padding). -struct EightBits { - explicit EightBits(int /* unused */) : data(0) {} - bool operator==(const EightBits& rhs) const { return data == rhs.data; } - uint8_t data; -}; - -template -void BM_absl_equal_benchmark(benchmark::State& state) { - std::vector xs(state.range(0), T(0)); - std::vector ys = xs; - while (state.KeepRunning()) { - const bool same = absl::equal(xs.begin(), xs.end(), ys.begin(), ys.end()); - benchmark::DoNotOptimize(same); - } -} - -template -void BM_std_equal_benchmark(benchmark::State& state) { - std::vector xs(state.range(0), T(0)); - std::vector ys = xs; - while (state.KeepRunning()) { - const bool same = std::equal(xs.begin(), xs.end(), ys.begin()); - benchmark::DoNotOptimize(same); - } -} - -template -void BM_memcmp_benchmark(benchmark::State& state) { - std::vector xs(state.range(0), T(0)); - std::vector ys = xs; - while (state.KeepRunning()) { - const bool same = - std::memcmp(xs.data(), ys.data(), xs.size() * sizeof(T)) == 0; - benchmark::DoNotOptimize(same); - } -} - -// The expectation is that the compiler should be able to elide the equality -// comparison altogether for sufficiently simple types. -template -void BM_absl_equal_self_benchmark(benchmark::State& state) { - std::vector xs(state.range(0), T(0)); - while (state.KeepRunning()) { - const bool same = absl::equal(xs.begin(), xs.end(), xs.begin(), xs.end()); - benchmark::DoNotOptimize(same); - } -} - -BENCHMARK_TEMPLATE(BM_absl_equal_benchmark, uint8_t) - ->Range(kMinBenchmarkSize, kMaxBenchmarkSize); -BENCHMARK_TEMPLATE(BM_std_equal_benchmark, uint8_t) - ->Range(kMinBenchmarkSize, kMaxBenchmarkSize); -BENCHMARK_TEMPLATE(BM_memcmp_benchmark, uint8_t) - ->Range(kMinBenchmarkSize, kMaxBenchmarkSize); -BENCHMARK_TEMPLATE(BM_absl_equal_self_benchmark, uint8_t) - ->Range(kMinBenchmarkSize, kMaxBenchmarkSize); - -BENCHMARK_TEMPLATE(BM_absl_equal_benchmark, uint16_t) - ->Range(kMinBenchmarkSize, kMaxBenchmarkSize); -BENCHMARK_TEMPLATE(BM_std_equal_benchmark, uint16_t) - ->Range(kMinBenchmarkSize, kMaxBenchmarkSize); -BENCHMARK_TEMPLATE(BM_memcmp_benchmark, uint16_t) - ->Range(kMinBenchmarkSize, kMaxBenchmarkSize); -BENCHMARK_TEMPLATE(BM_absl_equal_self_benchmark, uint16_t) - ->Range(kMinBenchmarkSize, kMaxBenchmarkSize); - -BENCHMARK_TEMPLATE(BM_absl_equal_benchmark, uint32_t) - ->Range(kMinBenchmarkSize, kMaxBenchmarkSize); -BENCHMARK_TEMPLATE(BM_std_equal_benchmark, uint32_t) - ->Range(kMinBenchmarkSize, kMaxBenchmarkSize); -BENCHMARK_TEMPLATE(BM_memcmp_benchmark, uint32_t) - ->Range(kMinBenchmarkSize, kMaxBenchmarkSize); -BENCHMARK_TEMPLATE(BM_absl_equal_self_benchmark, uint32_t) - ->Range(kMinBenchmarkSize, kMaxBenchmarkSize); - -BENCHMARK_TEMPLATE(BM_absl_equal_benchmark, uint64_t) - ->Range(kMinBenchmarkSize, kMaxBenchmarkSize); -BENCHMARK_TEMPLATE(BM_std_equal_benchmark, uint64_t) - ->Range(kMinBenchmarkSize, kMaxBenchmarkSize); -BENCHMARK_TEMPLATE(BM_memcmp_benchmark, uint64_t) - ->Range(kMinBenchmarkSize, kMaxBenchmarkSize); -BENCHMARK_TEMPLATE(BM_absl_equal_self_benchmark, uint64_t) - ->Range(kMinBenchmarkSize, kMaxBenchmarkSize); - -BENCHMARK_TEMPLATE(BM_absl_equal_benchmark, EightBits) - ->Range(kMinBenchmarkSize, kMaxBenchmarkSize); -BENCHMARK_TEMPLATE(BM_std_equal_benchmark, EightBits) - ->Range(kMinBenchmarkSize, kMaxBenchmarkSize); -BENCHMARK_TEMPLATE(BM_memcmp_benchmark, EightBits) - ->Range(kMinBenchmarkSize, kMaxBenchmarkSize); -BENCHMARK_TEMPLATE(BM_absl_equal_self_benchmark, EightBits) - ->Range(kMinBenchmarkSize, kMaxBenchmarkSize); - -} // namespace -- cgit v1.2.3