Did not push all files....

src/ImageSharp/Formats/Webp/BitReader/Vp8BitReader.cs

@@ -4,6 +4,7 @@
 using System.Buffers;
 using System.Buffers.Binary;
 using System.IO;
+using System.Numerics;
 using System.Runtime.CompilerServices;
 using SixLabors.ImageSharp.Memory;
 
@@ -111,7 +112,7 @@ namespace SixLabors.ImageSharp.Formats.Webp.BitReader
                 range = split + 1;
             }
 
-            int shift = 7 ^ Numerics.Log2(range);
+            int shift = 7 ^ BitOperations.Log2(range);
             range <<= shift;
             this.bits -= shift;
 

src/ImageSharp/Formats/Webp/Lossless/LosslessUtils.cs

@@ -2,6 +2,7 @@
 // Licensed under the Six Labors Split License.
 
 using System;
+using System.Numerics;
 using System.Runtime.CompilerServices;
 using System.Runtime.InteropServices;
 using System.Runtime.Intrinsics;
@@ -1041,7 +1042,7 @@ namespace SixLabors.ImageSharp.Formats.Webp.Lossless
         /// </summary>
         private static int PrefixEncodeBitsNoLut(int distance, ref int extraBits)
         {
-            int highestBit = Numerics.Log2((uint)--distance);
+            int highestBit = BitOperations.Log2((uint)--distance);
             int secondHighestBit = (distance >> (highestBit - 1)) & 1;
             extraBits = highestBit - 1;
             int code = (2 * highestBit) + secondHighestBit;
@@ -1050,7 +1051,7 @@ namespace SixLabors.ImageSharp.Formats.Webp.Lossless
 
         private static int PrefixEncodeNoLut(int distance, ref int extraBits, ref int extraBitsValue)
         {
-            int highestBit = Numerics.Log2((uint)--distance);
+            int highestBit = BitOperations.Log2((uint)--distance);
             int secondHighestBit = (distance >> (highestBit - 1)) & 1;
             extraBits = highestBit - 1;
             extraBitsValue = distance & ((1 << extraBits) - 1);

src/ImageSharp/Formats/Webp/Lossless/Vp8LEncoder.cs

@@ -6,6 +6,7 @@ using System.Buffers;
 using System.Collections.Generic;
 using System.IO;
 using System.Linq;
+using System.Numerics;
 using System.Runtime.CompilerServices;
 using System.Runtime.InteropServices;
 using SixLabors.ImageSharp.Formats.Webp.BitWriter;
@@ -382,7 +383,7 @@ namespace SixLabors.ImageSharp.Formats.Webp.Lossless
                     // If using a color cache, do not have it bigger than the number of colors.
                     if (useCache && this.PaletteSize < 1 << WebpConstants.MaxColorCacheBits)
                     {
-                        this.CacheBits = Numerics.Log2((uint)this.PaletteSize) + 1;
+                        this.CacheBits = BitOperations.Log2((uint)this.PaletteSize) + 1;
                     }
                 }
 
@@ -951,7 +952,7 @@ namespace SixLabors.ImageSharp.Formats.Webp.Lossless
                 }
                 else
                 {
-                    int nBits = Numerics.Log2((uint)trimmedLength - 2);
+                    int nBits = BitOperations.Log2((uint)trimmedLength - 2);
                     int nBitPairs = (nBits / 2) + 1;
                     this.bitWriter.PutBits((uint)nBitPairs - 1, 3);
                     this.bitWriter.PutBits((uint)trimmedLength - 2, nBitPairs * 2);

src/ImageSharp/Formats/Webp/Lossy/Vp8Residual.cs

@@ -2,6 +2,7 @@
 // Licensed under the Six Labors Split License.
 
 using System;
+using System.Numerics;
 using System.Runtime.CompilerServices;
 using System.Runtime.InteropServices;
 using System.Runtime.Intrinsics;
@@ -62,7 +63,7 @@ namespace SixLabors.ImageSharp.Formats.Webp.Lossy
 
                 // The position of the most significant non-zero bit indicates the position of
                 // the last non-zero value.
-                this.Last = mask != 0 ? Numerics.Log2(mask) : -1;
+                this.Last = mask != 0 ? BitOperations.Log2(mask) : -1;
             }
             else
             {

tests/ImageSharp.Tests/Common/NumericsTests.cs

@@ -2,6 +2,7 @@
 // Licensed under the Six Labors Split License.
 
 using System;
+using System.Numerics;
 using Xunit;
 using Xunit.Abstractions;
 
@@ -34,7 +35,7 @@ namespace SixLabors.ImageSharp.Tests.Common
         {
             uint value = 0;
             int expected = 0;
-            int actual = Numerics.Log2(value);
+            int actual = BitOperations.Log2(value);
 
             Assert.Equal(expected, actual);
         }
@@ -47,7 +48,7 @@ namespace SixLabors.ImageSharp.Tests.Common
                 // from 2^0 to 2^32
                 uint value = (uint)(1 << i);
                 int expected = i;
-                int actual = Numerics.Log2(value);
+                int actual = BitOperations.Log2(value);
 
                 Assert.Equal(expected, actual);
             }
@@ -66,7 +67,7 @@ namespace SixLabors.ImageSharp.Tests.Common
                 rng.NextBytes(bytes);
                 uint value = BitConverter.ToUInt32(bytes, 0);
                 int expected = Log2_ReferenceImplementation(value);
-                int actual = Numerics.Log2(value);
+                int actual = BitOperations.Log2(value);
 
                 Assert.Equal(expected, actual);
             }