sfizz/benchmarks/BM_mathfuns.cpp

#include <benchmark/benchmark.h>
#include <random>
#include <numeric>
#include <vector>
#include <cmath>
#include <iostream>
#include "../sources/SIMDHelpers.h"

class MyFixture : public benchmark::Fixture {
public:
  void SetUp(const ::benchmark::State& state) {
    std::random_device rd { };
    std::mt19937 gen { rd() };
    std::uniform_real_distribution<float> dist { 0.1, 1 };
    source = std::vector<float>(state.range(0));
    result = std::vector<float>(state.range(0));
    std::generate(source.begin(), source.end(), [&]() { return dist(gen); });
  }

  void TearDown(const ::benchmark::State& state [[maybe_unused]]) {
  }

  std::vector<float> source;
  std::vector<float> result;
};


BENCHMARK_DEFINE_F(MyFixture, Dummy)(benchmark::State& state) {
    for (auto _ : state)
    {
         for (int i = 0; i < state.range(0); ++i)
            result[i] = source[i];
        benchmark::DoNotOptimize(result);
    }
}

BENCHMARK_DEFINE_F(MyFixture, StdExp)(benchmark::State& state) {
    for (auto _ : state)
    {
        for (int i = 0; i < state.range(0); ++i)
            result[i] = std::exp(source[i]);
        benchmark::DoNotOptimize(result);
    }
}

BENCHMARK_DEFINE_F(MyFixture, ScalarExp)(benchmark::State& state) {
    for (auto _ : state)
    {
        exp<float, false>(source, absl::MakeSpan(result));
        benchmark::DoNotOptimize(result);
    }
}

BENCHMARK_DEFINE_F(MyFixture, SIMDExp)(benchmark::State& state) {
    for (auto _ : state)
    {
        exp<float, true>(source, absl::MakeSpan(result));
        benchmark::DoNotOptimize(result);
    }
}

BENCHMARK_DEFINE_F(MyFixture, StdLog)(benchmark::State& state) {
    for (auto _ : state)
    {
        for (int i = 0; i < state.range(0); ++i)
            result[i] = std::log(source[i]);
        benchmark::DoNotOptimize(result);
    }
}

BENCHMARK_DEFINE_F(MyFixture, ScalarLog)(benchmark::State& state) {
    for (auto _ : state)
    {
        log<float, false>(source, absl::MakeSpan(result));
        benchmark::DoNotOptimize(result);
    }
}

BENCHMARK_DEFINE_F(MyFixture, SIMDLog)(benchmark::State& state) {
    for (auto _ : state)
    {
        log<float, true>(source, absl::MakeSpan(result));
        benchmark::DoNotOptimize(result);
    }
}

BENCHMARK_DEFINE_F(MyFixture, StdSin)(benchmark::State& state) {
    for (auto _ : state)
    {
        for (int i = 0; i < state.range(0); ++i)
            result[i] = std::sin(source[i]);
        benchmark::DoNotOptimize(result);
    }
}

BENCHMARK_DEFINE_F(MyFixture, ScalarSin)(benchmark::State& state) {
    for (auto _ : state)
    {
        sin<float, false>(source, absl::MakeSpan(result));
        benchmark::DoNotOptimize(result);
    }
}

BENCHMARK_DEFINE_F(MyFixture, SIMDSin)(benchmark::State& state) {
    for (auto _ : state)
    {
        sin<float, true>(source, absl::MakeSpan(result));
        benchmark::DoNotOptimize(result);
    }
}

BENCHMARK_DEFINE_F(MyFixture, StdCos)(benchmark::State& state) {
    for (auto _ : state)
    {
        for (int i = 0; i < state.range(0); ++i)
            result[i] = std::cos(source[i]);
        benchmark::DoNotOptimize(result);
    }
}

BENCHMARK_DEFINE_F(MyFixture, ScalarCos)(benchmark::State& state) {
    for (auto _ : state)
    {
        cos<float, false>(source, absl::MakeSpan(result));
        benchmark::DoNotOptimize(result);
    }
}

BENCHMARK_DEFINE_F(MyFixture, SIMDCos)(benchmark::State& state) {
    for (auto _ : state)
    {
        cos<float, true>(source, absl::MakeSpan(result));
        benchmark::DoNotOptimize(result);
    }
}

BENCHMARK_REGISTER_F(MyFixture, Dummy)->RangeMultiplier(4)->Range(1 << 6, 1 << 10);
BENCHMARK_REGISTER_F(MyFixture, StdExp)->RangeMultiplier(4)->Range(1 << 6, 1 << 10);
BENCHMARK_REGISTER_F(MyFixture, ScalarExp)->RangeMultiplier(4)->Range(1 << 6, 1 << 10);
BENCHMARK_REGISTER_F(MyFixture, SIMDExp)->RangeMultiplier(4)->Range(1 << 6, 1 << 10);
BENCHMARK_REGISTER_F(MyFixture, StdLog)->RangeMultiplier(4)->Range(1 << 6, 1 << 10);
BENCHMARK_REGISTER_F(MyFixture, ScalarLog)->RangeMultiplier(4)->Range(1 << 6, 1 << 10);
BENCHMARK_REGISTER_F(MyFixture, SIMDLog)->RangeMultiplier(4)->Range(1 << 6, 1 << 10);
BENCHMARK_REGISTER_F(MyFixture, StdSin)->RangeMultiplier(4)->Range(1 << 6, 1 << 10);
BENCHMARK_REGISTER_F(MyFixture, ScalarSin)->RangeMultiplier(4)->Range(1 << 6, 1 << 10);
BENCHMARK_REGISTER_F(MyFixture, SIMDSin)->RangeMultiplier(4)->Range(1 << 6, 1 << 10);
BENCHMARK_REGISTER_F(MyFixture, StdCos)->RangeMultiplier(4)->Range(1 << 6, 1 << 10);
BENCHMARK_REGISTER_F(MyFixture, ScalarCos)->RangeMultiplier(4)->Range(1 << 6, 1 << 10);
BENCHMARK_REGISTER_F(MyFixture, SIMDCos)->RangeMultiplier(4)->Range(1 << 6, 1 << 10);

BENCHMARK_MAIN();