75 lines
2.2 KiB
C++
75 lines
2.2 KiB
C++
// SPDX-License-Identifier: BSD-2-Clause
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// This code is part of the sfizz library and is licensed under a BSD 2-clause
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// license. You should have receive a LICENSE.md file along with the code.
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// If not, contact the sfizz maintainers at https://github.com/sfztools/sfizz
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#include "SIMDHelpers.h"
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#include "absl/types/span.h"
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#include <benchmark/benchmark.h>
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#include <cmath>
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#include <iostream>
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#include <numeric>
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#include <random>
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#include <vector>
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class MyFixture : public benchmark::Fixture {
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public:
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void SetUp(const ::benchmark::State& state)
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{
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std::random_device rd {};
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std::mt19937 gen { rd() };
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std::uniform_real_distribution<float> dist { 0.1f, 1.0f };
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source = std::vector<float>(state.range(0));
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result = std::vector<float>(state.range(0));
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intResult = std::vector<int>(state.range(0));
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std::generate(source.begin(), source.end(), [&]() { return dist(gen); });
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}
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void TearDown(const ::benchmark::State& /* state */)
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{
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}
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std::vector<float> source;
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std::vector<float> result;
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std::vector<int> intResult;
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};
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BENCHMARK_DEFINE_F(MyFixture, Dummy)
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(benchmark::State& state)
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{
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for (auto _ : state) {
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for (int i = 0; i < state.range(0); ++i)
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result[i] = source[i];
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benchmark::DoNotOptimize(result);
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}
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}
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BENCHMARK_DEFINE_F(MyFixture, ScalarLibmFloorLog2)
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(benchmark::State& state)
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{
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for (auto _ : state) {
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for (size_t i = 0, n = source.size(); i < n; ++i) {
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intResult[i] = static_cast<int>(
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std::floor(std::log2(std::fabs(source[i]))));
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}
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benchmark::DoNotOptimize(intResult);
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}
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}
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BENCHMARK_DEFINE_F(MyFixture, ScalarFastFloorLog2)
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(benchmark::State& state)
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{
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for (auto _ : state) {
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for (size_t i = 0, n = source.size(); i < n; ++i) {
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intResult[i] = fp_exponent(source[i]);
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}
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benchmark::DoNotOptimize(intResult);
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}
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}
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BENCHMARK_REGISTER_F(MyFixture, Dummy)->RangeMultiplier(4)->Range(1 << 6, 1 << 10);
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BENCHMARK_REGISTER_F(MyFixture, ScalarLibmFloorLog2)->RangeMultiplier(4)->Range(1 << 6, 1 << 10);
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BENCHMARK_REGISTER_F(MyFixture, ScalarFastFloorLog2)->RangeMultiplier(4)->Range(1 << 6, 1 << 10);
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BENCHMARK_MAIN();
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