text: // Copyright (c) 2019, Paul Ferrand
  // All rights reserved.
  
  // Redistribution and use in source and binary forms, with or without
  // modification, are permitted provided that the following conditions are met:
  
  // 1. Redistributions of source code must retain the above copyright notice, this
  //    list of conditions and the following disclaimer.
  // 2. Redistributions in binary form must reproduce the above copyright notice,
  //    this list of conditions and the following disclaimer in the documentation
  //    and/or other materials provided with the distribution.
  
  // THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS" AND
  // ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
  // WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
  // DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE LIABLE FOR
  // ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
  // (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
  // LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND
  // ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
  // (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
  // SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
  
  #include <benchmark/benchmark.h>
  #include "../sfizz/SIMDHelpers.h"
  #include "../sfizz/Buffer.h"
  #include <algorithm>
  #include <numeric>
  #include <absl/types/span.h>
  
  static void Interleaved_Write(benchmark::State& state) {
    Buffer<float> inputLeft (state.range(0));
    Buffer<float> inputRight (state.range(0));
    Buffer<float> output (state.range(0) * 2);
    std::iota(inputLeft.begin(), inputLeft.end(), 1.0f);
    std::iota(inputRight.begin(), inputRight.end(), 1.0f);
  
    for (auto _ : state) {
      writeInterleaved<float, false>(inputLeft, inputRight, absl::MakeSpan(output));
    }
  }
  
  static void Interleaved_Write_SSE(benchmark::State& state) {
    Buffer<float> inputLeft (state.range(0));
    Buffer<float> inputRight (state.range(0));
    Buffer<float> output (state.range(0) * 2);
    std::iota(inputLeft.begin(), inputLeft.end(), 1.0f);
    std::iota(inputRight.begin(), inputRight.end(), 1.0f);
    for (auto _ : state) {
      writeInterleaved<float, true>(inputLeft, inputRight, absl::MakeSpan(output));
      benchmark::DoNotOptimize(output);
    }
  }
  
  static void Unaligned_Interleaved_Write(benchmark::State& state) {
    Buffer<float> inputLeft (state.range(0));
    Buffer<float> inputRight (state.range(0));
    Buffer<float> output (state.range(0) * 2);
    std::iota(inputLeft.begin(), inputLeft.end(), 1.0f);
    std::iota(inputRight.begin(), inputRight.end(), 1.0f);
    for (auto _ : state) {
      writeInterleaved<float, false>(absl::MakeSpan(inputLeft).subspan(1) , absl::MakeSpan(inputRight).subspan(1), absl::MakeSpan(output).subspan(2));
      benchmark::DoNotOptimize(output);
    }
  }
  
  static void Unaligned_Interleaved_Write_SSE(benchmark::State& state) {
    Buffer<float> inputLeft (state.range(0));
    Buffer<float> inputRight (state.range(0));
    Buffer<float> output (state.range(0) * 2);
    std::iota(inputLeft.begin(), inputLeft.end(), 1.0f);
    std::iota(inputRight.begin(), inputRight.end(), 1.0f);
    for (auto _ : state) {
      writeInterleaved<float, true>(absl::MakeSpan(inputLeft).subspan(1) , absl::MakeSpan(inputRight).subspan(1), absl::MakeSpan(output).subspan(2));
      benchmark::DoNotOptimize(output);
    }
  }
  
  static void Unaligned_Interleaved_Write_2(benchmark::State& state) {
    Buffer<float> inputLeft (state.range(0));
    Buffer<float> inputRight (state.range(0));
    Buffer<float> output (state.range(0) * 2);
    std::iota(inputLeft.begin(), inputLeft.end(), 1.0f);
    std::iota(inputRight.begin(), inputRight.end(), 1.0f);
    for (auto _ : state) {
      writeInterleaved<float, false>(absl::MakeSpan(inputLeft) , absl::MakeSpan(inputRight).subspan(1), absl::MakeSpan(output).subspan(2));
      benchmark::DoNotOptimize(output);
    }
  }
  
  static void Unaligned_Interleaved_Write_SSE_2(benchmark::State& state) {
    Buffer<float> inputLeft (state.range(0));
    Buffer<float> inputRight (state.range(0));
    Buffer<float> output (state.range(0) * 2);
    std::iota(inputLeft.begin(), inputLeft.end(), 1.0f);
    std::iota(inputRight.begin(), inputRight.end(), 1.0f);
    for (auto _ : state) {
      writeInterleaved<float, true>(absl::MakeSpan(inputLeft) , absl::MakeSpan(inputRight).subspan(1), absl::MakeSpan(output).subspan(2));
      benchmark::DoNotOptimize(output);
    }
  }
  
  BENCHMARK(Interleaved_Write)->Range((8<<10), (8<<20));
  BENCHMARK(Interleaved_Write_SSE)->Range((8<<10), (8<<20));
  BENCHMARK(Unaligned_Interleaved_Write)->Range((8<<10), (8<<20));
  BENCHMARK(Unaligned_Interleaved_Write_SSE)->Range((8<<10), (8<<20));
  BENCHMARK(Unaligned_Interleaved_Write_2)->Range((8<<10), (8<<20));
  BENCHMARK(Unaligned_Interleaved_Write_SSE_2)->Range((8<<10), (8<<20));
  BENCHMARK_MAIN();