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Diffstat (limited to 'absl/functional/function_ref_benchmark.cc')
-rw-r--r-- | absl/functional/function_ref_benchmark.cc | 142 |
1 files changed, 142 insertions, 0 deletions
diff --git a/absl/functional/function_ref_benchmark.cc b/absl/functional/function_ref_benchmark.cc new file mode 100644 index 00000000..045305bf --- /dev/null +++ b/absl/functional/function_ref_benchmark.cc @@ -0,0 +1,142 @@ +// Copyright 2019 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/functional/function_ref.h" + +#include <memory> + +#include "benchmark/benchmark.h" +#include "absl/base/attributes.h" + +namespace absl { +ABSL_NAMESPACE_BEGIN +namespace { + +int dummy = 0; + +void FreeFunction() { benchmark::DoNotOptimize(dummy); } + +struct TrivialFunctor { + void operator()() const { benchmark::DoNotOptimize(dummy); } +}; + +struct LargeFunctor { + void operator()() const { benchmark::DoNotOptimize(this); } + std::string a, b, c; +}; + +template <typename Function, typename... Args> +void ABSL_ATTRIBUTE_NOINLINE CallFunction(Function f, Args&&... args) { + f(std::forward<Args>(args)...); +} + +template <typename Function, typename Callable, typename... Args> +void ConstructAndCallFunctionBenchmark(benchmark::State& state, + const Callable& c, Args&&... args) { + for (auto _ : state) { + CallFunction<Function>(c, std::forward<Args>(args)...); + } +} + +void BM_TrivialStdFunction(benchmark::State& state) { + ConstructAndCallFunctionBenchmark<std::function<void()>>(state, + TrivialFunctor{}); +} +BENCHMARK(BM_TrivialStdFunction); + +void BM_TrivialFunctionRef(benchmark::State& state) { + ConstructAndCallFunctionBenchmark<FunctionRef<void()>>(state, + TrivialFunctor{}); +} +BENCHMARK(BM_TrivialFunctionRef); + +void BM_LargeStdFunction(benchmark::State& state) { + ConstructAndCallFunctionBenchmark<std::function<void()>>(state, + LargeFunctor{}); +} +BENCHMARK(BM_LargeStdFunction); + +void BM_LargeFunctionRef(benchmark::State& state) { + ConstructAndCallFunctionBenchmark<FunctionRef<void()>>(state, LargeFunctor{}); +} +BENCHMARK(BM_LargeFunctionRef); + +void BM_FunPtrStdFunction(benchmark::State& state) { + ConstructAndCallFunctionBenchmark<std::function<void()>>(state, FreeFunction); +} +BENCHMARK(BM_FunPtrStdFunction); + +void BM_FunPtrFunctionRef(benchmark::State& state) { + ConstructAndCallFunctionBenchmark<FunctionRef<void()>>(state, FreeFunction); +} +BENCHMARK(BM_FunPtrFunctionRef); + +// Doesn't include construction or copy overhead in the loop. +template <typename Function, typename Callable, typename... Args> +void CallFunctionBenchmark(benchmark::State& state, const Callable& c, + Args... args) { + Function f = c; + for (auto _ : state) { + benchmark::DoNotOptimize(&f); + f(args...); + } +} + +struct FunctorWithTrivialArgs { + void operator()(int a, int b, int c) const { + benchmark::DoNotOptimize(a); + benchmark::DoNotOptimize(b); + benchmark::DoNotOptimize(c); + } +}; + +void BM_TrivialArgsStdFunction(benchmark::State& state) { + CallFunctionBenchmark<std::function<void(int, int, int)>>( + state, FunctorWithTrivialArgs{}, 1, 2, 3); +} +BENCHMARK(BM_TrivialArgsStdFunction); + +void BM_TrivialArgsFunctionRef(benchmark::State& state) { + CallFunctionBenchmark<FunctionRef<void(int, int, int)>>( + state, FunctorWithTrivialArgs{}, 1, 2, 3); +} +BENCHMARK(BM_TrivialArgsFunctionRef); + +struct FunctorWithNonTrivialArgs { + void operator()(std::string a, std::string b, std::string c) const { + benchmark::DoNotOptimize(&a); + benchmark::DoNotOptimize(&b); + benchmark::DoNotOptimize(&c); + } +}; + +void BM_NonTrivialArgsStdFunction(benchmark::State& state) { + std::string a, b, c; + CallFunctionBenchmark< + std::function<void(std::string, std::string, std::string)>>( + state, FunctorWithNonTrivialArgs{}, a, b, c); +} +BENCHMARK(BM_NonTrivialArgsStdFunction); + +void BM_NonTrivialArgsFunctionRef(benchmark::State& state) { + std::string a, b, c; + CallFunctionBenchmark< + FunctionRef<void(std::string, std::string, std::string)>>( + state, FunctorWithNonTrivialArgs{}, a, b, c); +} +BENCHMARK(BM_NonTrivialArgsFunctionRef); + +} // namespace +ABSL_NAMESPACE_END +} // namespace absl |