fixed_array_benchmark.cc

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// 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 <stddef.h>

#include <string>

#include "absl/container/fixed_array.h"

#include "benchmark/benchmark.h"

namespace {

// For benchmarking -- simple class with constructor and destructor that

// set an int to a constant..

class SimpleClass {

 public:

  SimpleClass() : i(3) {}

  ~SimpleClass() { i = 0; }

 private:

  int i;

};

template <typename C, size_t stack_size>

void BM_FixedArray(benchmark::State& state) {

  const int size = state.range(0);

  for (auto _ : state) {

    absl::FixedArray<C, stack_size> fa(size);

    benchmark::DoNotOptimize(fa.data());

BENCHMARK_TEMPLATE(BM_FixedArray, char, absl::kFixedArrayUseDefault)

    ->Range(0, 1 << 16);

BENCHMARK_TEMPLATE(BM_FixedArray, char, 0)->Range(0, 1 << 16);

BENCHMARK_TEMPLATE(BM_FixedArray, char, 1)->Range(0, 1 << 16);

BENCHMARK_TEMPLATE(BM_FixedArray, char, 16)->Range(0, 1 << 16);

BENCHMARK_TEMPLATE(BM_FixedArray, char, 256)->Range(0, 1 << 16);

BENCHMARK_TEMPLATE(BM_FixedArray, char, 65536)->Range(0, 1 << 16);

BENCHMARK_TEMPLATE(BM_FixedArray, SimpleClass, absl::kFixedArrayUseDefault)

    ->Range(0, 1 << 16);

BENCHMARK_TEMPLATE(BM_FixedArray, SimpleClass, 0)->Range(0, 1 << 16);

BENCHMARK_TEMPLATE(BM_FixedArray, SimpleClass, 1)->Range(0, 1 << 16);

BENCHMARK_TEMPLATE(BM_FixedArray, SimpleClass, 16)->Range(0, 1 << 16);

BENCHMARK_TEMPLATE(BM_FixedArray, SimpleClass, 256)->Range(0, 1 << 16);

BENCHMARK_TEMPLATE(BM_FixedArray, SimpleClass, 65536)->Range(0, 1 << 16);

BENCHMARK_TEMPLATE(BM_FixedArray, std::string, absl::kFixedArrayUseDefault)

    ->Range(0, 1 << 16);

BENCHMARK_TEMPLATE(BM_FixedArray, std::string, 0)->Range(0, 1 << 16);

BENCHMARK_TEMPLATE(BM_FixedArray, std::string, 1)->Range(0, 1 << 16);

BENCHMARK_TEMPLATE(BM_FixedArray, std::string, 16)->Range(0, 1 << 16);

BENCHMARK_TEMPLATE(BM_FixedArray, std::string, 256)->Range(0, 1 << 16);

BENCHMARK_TEMPLATE(BM_FixedArray, std::string, 65536)->Range(0, 1 << 16);

}  // namespace