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171 lines
8.0 KiB
171 lines
8.0 KiB
// Copyright (c) Six Labors.
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// Licensed under the Six Labors Split License.
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using System.Buffers;
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using System.Numerics;
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using System.Runtime.CompilerServices;
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using System.Runtime.InteropServices;
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using System.Runtime.Intrinsics;
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using System.Runtime.Intrinsics.X86;
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using BenchmarkDotNet.Attributes;
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using SixLabors.ImageSharp.Memory;
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using SixLabors.ImageSharp.PixelFormats;
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// ReSharper disable InconsistentNaming
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namespace SixLabors.ImageSharp.Benchmarks.Bulk;
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public abstract class FromVector4<TPixel>
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where TPixel : unmanaged, IPixel<TPixel>
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{
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protected IMemoryOwner<Vector4> Source { get; set; }
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protected IMemoryOwner<TPixel> Destination { get; set; }
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protected Configuration Configuration => Configuration.Default;
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// [Params(64, 2048)]
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[Params(64, 256, 2048)]
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public int Count { get; set; }
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[GlobalSetup]
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public void Setup()
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{
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this.Destination = this.Configuration.MemoryAllocator.Allocate<TPixel>(this.Count);
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this.Source = this.Configuration.MemoryAllocator.Allocate<Vector4>(this.Count);
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}
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[GlobalCleanup]
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public void Cleanup()
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{
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this.Destination.Dispose();
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this.Source.Dispose();
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}
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// [Benchmark]
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public void PerElement()
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{
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ref Vector4 s = ref MemoryMarshal.GetReference(this.Source.GetSpan());
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ref TPixel d = ref MemoryMarshal.GetReference(this.Destination.GetSpan());
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for (nuint i = 0; i < (uint)this.Count; i++)
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{
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Unsafe.Add(ref d, i) = TPixel.FromVector4(Unsafe.Add(ref s, i));
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}
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}
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[Benchmark(Baseline = true)]
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public void PixelOperations_Base()
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=> new PixelOperations<TPixel>().FromVector4Destructive(this.Configuration, this.Source.GetSpan(), this.Destination.GetSpan());
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[Benchmark]
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public void PixelOperations_Specialized()
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=> PixelOperations<TPixel>.Instance.FromVector4Destructive(this.Configuration, this.Source.GetSpan(), this.Destination.GetSpan());
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}
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[Config(typeof(Config.Short))]
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public class FromVector4Rgba32 : FromVector4<Rgba32>
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{
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/// <summary>
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/// Measures the raw SIMD kernel that converts normalized RGBA vector components to bytes.
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/// </summary>
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[Benchmark]
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public void UseHwIntrinsics()
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{
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Span<float> sBytes = MemoryMarshal.Cast<Vector4, float>(this.Source.GetSpan());
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Span<byte> dFloats = MemoryMarshal.Cast<Rgba32, byte>(this.Destination.GetSpan());
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// Four components per pixel make every configured count divisible by the supported 128-, 256-, and 512-bit
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// byte-vector widths. Calling the block kernel directly therefore excludes PixelOperations contract handling
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// and the general conversion wrapper's remainder dispatch, establishing the lower bound for the SIMD conversion.
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SimdUtils.HwIntrinsics.NormalizedFloatToByteSaturate(sBytes, dFloats);
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}
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private static ReadOnlySpan<byte> PermuteMaskDeinterleave8x32 => [0, 0, 0, 0, 4, 0, 0, 0, 1, 0, 0, 0, 5, 0, 0, 0, 2, 0, 0, 0, 6, 0, 0, 0, 3, 0, 0, 0, 7, 0, 0, 0
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];
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[Benchmark]
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public void UseAvx2_Grouped()
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{
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Span<float> src = MemoryMarshal.Cast<Vector4, float>(this.Source.GetSpan());
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Span<byte> dest = MemoryMarshal.Cast<Rgba32, byte>(this.Destination.GetSpan());
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nuint n = (uint)dest.Length / (uint)Vector<byte>.Count;
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ref Vector256<float> sourceBase = ref Unsafe.As<float, Vector256<float>>(ref MemoryMarshal.GetReference(src));
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ref Vector256<byte> destBase = ref Unsafe.As<byte, Vector256<byte>>(ref MemoryMarshal.GetReference(dest));
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ref byte maskBase = ref MemoryMarshal.GetReference(PermuteMaskDeinterleave8x32);
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Vector256<int> mask = Unsafe.As<byte, Vector256<int>>(ref maskBase);
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Vector256<float> maxBytes = Vector256.Create(255f);
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for (nuint i = 0; i < n; i++)
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{
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ref Vector256<float> s = ref Unsafe.Add(ref sourceBase, i * 4);
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Vector256<float> f0 = s;
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Vector256<float> f1 = Unsafe.Add(ref s, 1);
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Vector256<float> f2 = Unsafe.Add(ref s, 2);
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Vector256<float> f3 = Unsafe.Add(ref s, 3);
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f0 = Avx.Multiply(maxBytes, f0);
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f1 = Avx.Multiply(maxBytes, f1);
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f2 = Avx.Multiply(maxBytes, f2);
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f3 = Avx.Multiply(maxBytes, f3);
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Vector256<int> w0 = Avx.ConvertToVector256Int32(f0);
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Vector256<int> w1 = Avx.ConvertToVector256Int32(f1);
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Vector256<int> w2 = Avx.ConvertToVector256Int32(f2);
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Vector256<int> w3 = Avx.ConvertToVector256Int32(f3);
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Vector256<short> u0 = Avx2.PackSignedSaturate(w0, w1);
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Vector256<short> u1 = Avx2.PackSignedSaturate(w2, w3);
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Vector256<byte> b = Avx2.PackUnsignedSaturate(u0, u1);
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b = Avx2.PermuteVar8x32(b.AsInt32(), mask).AsByte();
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Unsafe.Add(ref destBase, i) = b;
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}
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}
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/*
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BenchmarkDotNet v0.15.8, Windows 11 (10.0.26200.8737/25H2/2025Update/HudsonValley2)
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AMD RYZEN AI MAX+ 395 w/ Radeon 8060S 3.00GHz, 1 CPU, 32 logical and 16 physical cores
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.NET 8.0.28, X64 RyuJIT x86-64-v4
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| Method | Count | Mean | Error | StdDev | Ratio | RatioSD | Allocated |
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|---------------------------- |------ |------------:|-----------:|----------:|------:|--------:|----------:|
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| PixelOperations_Base | 64 | 60.19 ns | 32.376 ns | 1.775 ns | 1.00 | 0.04 | - |
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| PixelOperations_Specialized | 64 | 22.94 ns | 66.082 ns | 3.622 ns | 0.38 | 0.05 | - |
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| UseHwIntrinsics | 64 | 10.64 ns | 9.535 ns | 0.523 ns | 0.18 | 0.01 | - |
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| UseAvx2_Grouped | 64 | 11.69 ns | 0.997 ns | 0.055 ns | 0.19 | 0.01 | - |
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| PixelOperations_Base | 256 | 232.65 ns | 37.948 ns | 2.080 ns | 1.00 | 0.01 | - |
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| PixelOperations_Specialized | 256 | 33.75 ns | 3.906 ns | 0.214 ns | 0.15 | 0.00 | - |
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| UseHwIntrinsics | 256 | 21.91 ns | 2.732 ns | 0.150 ns | 0.09 | 0.00 | - |
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| UseAvx2_Grouped | 256 | 24.84 ns | 5.333 ns | 0.292 ns | 0.11 | 0.00 | - |
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| PixelOperations_Base | 2048 | 1,500.98 ns | 951.510 ns | 52.155 ns | 1.00 | 0.04 | - |
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| PixelOperations_Specialized | 2048 | 156.21 ns | 65.074 ns | 3.567 ns | 0.10 | 0.00 | - |
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| UseHwIntrinsics | 2048 | 144.38 ns | 40.947 ns | 2.244 ns | 0.10 | 0.00 | - |
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| UseAvx2_Grouped | 2048 | 189.80 ns | 54.098 ns | 2.965 ns | 0.13 | 0.00 | - |
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*/
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}
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/// <summary>
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/// Measures bulk conversion from <see cref="Vector4"/> values to premultiplied <see cref="Bgra32P"/> pixels.
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/// </summary>
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[Config(typeof(Config.Analysis))]
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public class FromVector4Bgra32P : FromVector4<Bgra32P>
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{
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/*
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BenchmarkDotNet v0.15.8, Windows 11 (10.0.26200.8737/25H2/2025Update/HudsonValley2)
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AMD RYZEN AI MAX+ 395 w/ Radeon 8060S 3.00GHz, 1 CPU, 32 logical and 16 physical cores
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.NET 8.0.28, X64 RyuJIT x86-64-v4
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| Method | Count | Mean | Error | StdDev | Ratio | RatioSD | Code Size | Allocated |
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|---------------------------- |------ |------------:|-----------:|----------:|------:|--------:|----------:|----------:|
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| PixelOperations_Base | 64 | 59.73 ns | 19.644 ns | 1.077 ns | 1.00 | 0.02 | 1,152 B | - |
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| PixelOperations_Specialized | 64 | 50.86 ns | 7.372 ns | 0.404 ns | 0.85 | 0.01 | 2,975 B | - |
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| PixelOperations_Base | 256 | 214.03 ns | 70.798 ns | 3.881 ns | 1.00 | 0.02 | 1,152 B | - |
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| PixelOperations_Specialized | 256 | 70.21 ns | 17.210 ns | 0.943 ns | 0.33 | 0.01 | 2,992 B | - |
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| PixelOperations_Base | 2048 | 1,855.02 ns | 443.677 ns | 24.319 ns | 1.00 | 0.02 | 1,152 B | - |
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| PixelOperations_Specialized | 2048 | 272.82 ns | 39.302 ns | 2.154 ns | 0.15 | 0.00 | 2,992 B | - |
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*/
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}
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