text: // SPDX-License-Identifier: BSD-2-Clause
  
  // This code is part of the sfizz library and is licensed under a BSD 2-clause
  // license. You should have receive a LICENSE.md file along with the code.
  // If not, contact the sfizz maintainers at https://github.com/sfztools/sfizz
  
  #include "SIMDHelpers.h"
  #include <benchmark/benchmark.h>
  #include <random>
  #include <numeric>
  #include <vector>
  #include <cmath>
  #include <iostream>
  
  class GainSingle : 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 };
      input = std::vector<float>(state.range(0));
      output = std::vector<float>(state.range(0));
      gain = dist(gen);
      std::generate(input.begin(), input.end(), [&]() { return dist(gen); });
    }
  
    void TearDown(const ::benchmark::State& /* state */) {
  
    }
  
    float gain;
    std::vector<float> input;
    std::vector<float> output;
  };
  
  class GainArray : 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 };
      input = std::vector<float>(state.range(0));
      output = std::vector<float>(state.range(0));
      gain = std::vector<float>(state.range(0));
      std::generate(gain.begin(), gain.end(), [&]() { return dist(gen); });
      std::generate(input.begin(), input.end(), [&]() { return dist(gen); });
    }
  
    void TearDown(const ::benchmark::State& /* state */) {
  
    }
  
    std::vector<float> gain;
    std::vector<float> input;
    std::vector<float> output;
  };
  
  BENCHMARK_DEFINE_F(GainSingle, Straight)(benchmark::State& state) {
      for (auto _ : state)
      {
          for (int i = 0; i < state.range(0); ++i)
              output[i] = gain * input[i];
      }
  }
  
  BENCHMARK_DEFINE_F(GainSingle, Scalar)(benchmark::State& state) {
      for (auto _ : state)
      {
          sfz::setSIMDOpStatus<float>(sfz::SIMDOps::gain1, false);
          sfz::applyGain1<float>(gain, input, absl::MakeSpan(output));
      }
  }
  
  BENCHMARK_DEFINE_F(GainSingle, SIMD)(benchmark::State& state) {
      for (auto _ : state)
      {
          sfz::setSIMDOpStatus<float>(sfz::SIMDOps::gain1, true);
          sfz::applyGain1<float>(gain, input, absl::MakeSpan(output));
      }
  }
  
  BENCHMARK_DEFINE_F(GainArray, Straight)(benchmark::State& state) {
      for (auto _ : state)
      {
          for (int i = 0; i < state.range(0); ++i)
              output[i] = gain[i] * input[i];
      }
  }
  
  BENCHMARK_DEFINE_F(GainArray, Scalar)(benchmark::State& state) {
      for (auto _ : state)
      {
          sfz::setSIMDOpStatus<float>(sfz::SIMDOps::gain, false);
          sfz::applyGain<float>(gain, input, absl::MakeSpan(output));
      }
  }
  
  BENCHMARK_DEFINE_F(GainArray, SIMD)(benchmark::State& state) {
      for (auto _ : state)
      {
          sfz::setSIMDOpStatus<float>(sfz::SIMDOps::gain, true);
          sfz::applyGain<float>(gain, input, absl::MakeSpan(output));
      }
  }
  
  BENCHMARK_DEFINE_F(GainArray, Scalar_Unaligned)(benchmark::State& state) {
      for (auto _ : state)
      {
          sfz::setSIMDOpStatus<float>(sfz::SIMDOps::gain, false);
          sfz::applyGain<float>(absl::MakeSpan(gain).subspan(1), absl::MakeSpan(input).subspan(1), absl::MakeSpan(output).subspan(1));
      }
  }
  
  BENCHMARK_DEFINE_F(GainArray, SIMD_Unaligned)(benchmark::State& state) {
      for (auto _ : state)
      {
          sfz::setSIMDOpStatus<float>(sfz::SIMDOps::gain, true);
          sfz::applyGain<float>(absl::MakeSpan(gain).subspan(1), absl::MakeSpan(input).subspan(1), absl::MakeSpan(output).subspan(1));
      }
  }
  
  
  
  BENCHMARK_REGISTER_F(GainSingle, Straight)->RangeMultiplier(4)->Range(1 << 2, 1 << 12);
  BENCHMARK_REGISTER_F(GainSingle, Scalar)->RangeMultiplier(4)->Range(1 << 2, 1 << 12);
  BENCHMARK_REGISTER_F(GainSingle, SIMD)->RangeMultiplier(4)->Range(1 << 2, 1 << 12);
  BENCHMARK_REGISTER_F(GainArray, Straight)->RangeMultiplier(4)->Range(1 << 2, 1 << 12);
  BENCHMARK_REGISTER_F(GainArray, Scalar)->RangeMultiplier(4)->Range(1 << 2, 1 << 12);
  BENCHMARK_REGISTER_F(GainArray, SIMD)->RangeMultiplier(4)->Range(1 << 2, 1 << 12);
  BENCHMARK_REGISTER_F(GainArray, Scalar_Unaligned)->RangeMultiplier(4)->Range(1 << 2, 1 << 12);
  BENCHMARK_REGISTER_F(GainArray, SIMD_Unaligned)->RangeMultiplier(4)->Range(1 << 2, 1 << 12);
  BENCHMARK_MAIN();
  