benchmarks for current state

src/ImageSharp/Common/Helpers/InliningOptions.cs

@@ -2,7 +2,7 @@
 // Licensed under the Apache License, Version 2.0.
 
 // Uncomment this for verbose profiler results:
-#define PROFILING
+// #define PROFILING
 using System.Runtime.CompilerServices;
 
 namespace SixLabors.ImageSharp

src/ImageSharp/Common/Helpers/SimdUtils.ExtendedIntrinsics.cs

@@ -28,7 +28,7 @@ namespace SixLabors.ImageSharp
             /// <summary>
             /// Widen and convert a vector of <see cref="short"/> values into 2 vectors of <see cref="float"/>-s.
             /// </summary>
-            [MethodImpl(InliningOptions.ShortMethod)]
+            [MethodImpl(MethodImplOptions.AggressiveInlining)]
             internal static void ConvertToSingle(
                 Vector<short> source,
                 out Vector<float> dest1,

tests/ImageSharp.Benchmarks/Codecs/Jpeg/DecodeJpeg.cs

@@ -76,5 +76,14 @@ namespace SixLabors.ImageSharp.Benchmarks.Codecs.Jpeg
         //                                 |         |                              |          |           |           |        |          |          |           |
         //  'Decode Jpeg - System.Drawing' |    Core | Jpg/baseline/jpeg420exif.jpg | 17.45 ms |  2.092 ms | 0.1182 ms |   1.00 |     0.00 | 218.7500 | 757.04 KB |
         //      'Decode Jpeg - ImageSharp' |    Core | Jpg/baseline/jpeg420exif.jpg | 48.39 ms | 14.562 ms | 0.8228 ms |   2.77 |     0.04 | 125.0000 | 529.96 KB |
+
+        // RESULTS (2018 November 1):
+        //                          Method | Runtime |                    TestImage |     Mean |     Error |    StdDev | Scaled | ScaledSD |    Gen 0 | Allocated |
+        // ------------------------------- |-------- |----------------------------- |---------:|----------:|----------:|-------:|---------:|---------:|----------:|
+        //  'Decode Jpeg - System.Drawing' |     Clr | Jpg/baseline/jpeg420exif.jpg | 17.59 ms |  4.611 ms | 0.2605 ms |   1.00 |     0.00 | 218.7500 | 757.88 KB |
+        //      'Decode Jpeg - ImageSharp' |     Clr | Jpg/baseline/jpeg420exif.jpg | 55.33 ms |  2.133 ms | 0.1205 ms |   3.15 |     0.04 | 125.0000 | 566.01 KB |
+        //                                 |         |                              |          |           |           |        |          |          |           |
+        //  'Decode Jpeg - System.Drawing' |    Core | Jpg/baseline/jpeg420exif.jpg | 17.83 ms | 24.326 ms | 1.3745 ms |   1.00 |     0.00 | 218.7500 | 757.04 KB |
+        //      'Decode Jpeg - ImageSharp' |    Core | Jpg/baseline/jpeg420exif.jpg | 44.93 ms |  3.088 ms | 0.1745 ms |   2.53 |     0.15 | 125.0000 | 529.96 KB |
     }
 }

tests/ImageSharp.Benchmarks/General/Block8x8F_LoadFromInt16.cs

@@ -0,0 +1,48 @@
+using System;
+using System.Numerics;
+
+using BenchmarkDotNet.Attributes;
+
+using SixLabors.ImageSharp.Formats.Jpeg.Components;
+
+namespace SixLabors.ImageSharp.Benchmarks.General
+{
+    public class Block8x8F_LoadFromInt16
+    {
+        private Block8x8 source;
+
+        private Block8x8F dest = default;
+
+        [GlobalSetup]
+        public void Setup()
+        {
+            if (Vector<float>.Count != 8)
+            {
+                throw new NotSupportedException("Vector<float>.Count != 8");
+            }
+
+            for (short i = 0; i < Block8x8F.Size; i++)
+            {
+                this.source[i] = i;
+            }
+        }
+
+        [Benchmark(Baseline = true)]
+        public void Scalar()
+        {
+            this.dest.LoadFromInt16Scalar(ref this.source);
+        }
+
+        [Benchmark]
+        public void ExtendedAvx2()
+        {
+            this.dest.LoadFromInt16ExtendedAvx2(ref this.source);
+        }
+
+        // RESULT:
+        //        Method |     Mean |     Error |    StdDev | Scaled |
+        // ------------- |---------:|----------:|----------:|-------:|
+        //        Scalar | 34.88 ns | 0.3296 ns | 0.3083 ns |   1.00 |
+        //  ExtendedAvx2 | 21.58 ns | 0.2125 ns | 0.1884 ns |   0.62 |
+    }
+}