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Initial 3padshuffle4

js/color-alpha-handling
James Jackson-South 5 years ago
parent
65b5a47c1a
commit
c4f7f67fd5
8 changed files with 274 additions and 29 deletions
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  1. 84
      src/ImageSharp/Common/Helpers/SimdUtils.HwIntrinsics.cs
  2. 63
      src/ImageSharp/Common/Helpers/SimdUtils.Shuffle.cs
  3. 12
      src/ImageSharp/PixelFormats/Utils/PixelConverter.cs
  4. 67
      tests/ImageSharp.Benchmarks/Color/Bulk/Pad3Shuffle4Channel.cs
  5. 2
      tests/ImageSharp.Benchmarks/Color/Bulk/ShuffleByte4Channel.cs
  6. 2
      tests/ImageSharp.Benchmarks/Color/Bulk/ShuffleFloat4Channel.cs
  7. 71
      tests/ImageSharp.Tests/Common/SimdUtilsTests.Shuffle.cs
  8. 2
      tests/ImageSharp.Tests/Common/SimdUtilsTests.cs

84
src/ImageSharp/Common/Helpers/SimdUtils.HwIntrinsics.cs
View File

@ -26,7 +26,7 @@ namespace SixLabors.ImageSharp
/// <param name="dest">The destination span of floats.</param>
/// <param name="control">The byte control.</param>
[MethodImpl(InliningOptions.ShortMethod)]
public static void Shuffle4ChannelReduce(
public static void Shuffle4Reduce(
ref ReadOnlySpan<float> source,
ref Span<float> dest,
byte control)
@ -41,7 +41,7 @@ namespace SixLabors.ImageSharp
if (adjustedCount > 0)
{
Shuffle4Channel(
Shuffle4(
source.Slice(0, adjustedCount),
dest.Slice(0, adjustedCount),
control);
@ -53,14 +53,14 @@ namespace SixLabors.ImageSharp
}
/// <summary>
/// Shuffle 8-bit integers in a within 128-bit lanes in <paramref name="source"/>
/// Shuffle 8-bit integers within 128-bit lanes in <paramref name="source"/>
/// using the control and store the results in <paramref name="dest"/>.
/// </summary>
/// <param name="source">The source span of bytes.</param>
/// <param name="dest">The destination span of bytes.</param>
/// <param name="control">The byte control.</param>
[MethodImpl(InliningOptions.ShortMethod)]
public static void Shuffle4ChannelReduce(
public static void Shuffle4Reduce(
ref ReadOnlySpan<byte> source,
ref Span<byte> dest,
byte control)
@ -75,7 +75,7 @@ namespace SixLabors.ImageSharp
if (adjustedCount > 0)
{
Shuffle4Channel(
Shuffle4(
source.Slice(0, adjustedCount),
dest.Slice(0, adjustedCount),
control);
@ -86,8 +86,41 @@ namespace SixLabors.ImageSharp
}
}
/// <summary>
/// Pads then shuffles 8-bit integers within 128-bit lanes in <paramref name="source"/>
/// using the control and store the results in <paramref name="dest"/>.
/// </summary>
/// <param name="source">The source span of bytes.</param>
/// <param name="dest">The destination span of bytes.</param>
/// <param name="control">The byte control.</param>
[MethodImpl(InliningOptions.ShortMethod)]
public static unsafe void Pad3Shuffle4Reduce(
ref ReadOnlySpan<byte> source,
ref Span<byte> dest,
byte control)
{
if (Ssse3.IsSupported)
{
int remainder = ImageMaths.ModuloP2(source.Length, Vector128<byte>.Count);
int adjustedCount = source.Length - remainder;
int sourceSlice = (int)(adjustedCount * (3 / 4F));
if (adjustedCount > 0)
{
Pad3Shuffle4(
source.Slice(0, adjustedCount),
dest.Slice(0, adjustedCount),
control);
source = source.Slice(sourceSlice);
dest = dest.Slice(adjustedCount);
}
}
}
[MethodImpl(InliningOptions.ShortMethod)]
private static void Shuffle4Channel(
private static void Shuffle4(
ReadOnlySpan<float> source,
Span<float> dest,
byte control)
@ -165,7 +198,7 @@ namespace SixLabors.ImageSharp
}
[MethodImpl(InliningOptions.ShortMethod)]
private static void Shuffle4Channel(
private static void Shuffle4(
ReadOnlySpan<byte> source,
Span<byte> dest,
byte control)
@ -246,6 +279,43 @@ namespace SixLabors.ImageSharp
}
}
[MethodImpl(InliningOptions.ShortMethod)]
private static unsafe void Pad3Shuffle4(
ReadOnlySpan<byte> source,
Span<byte> dest,
byte control)
{
if (Ssse3.IsSupported)
{
Vector128<byte> wMask = Vector128.Create(0xff000000u).AsByte();
Vector128<byte> padMask = Vector128.Create(0, 1, 2, -1, 3, 4, 5, -1, 6, 7, 8, -1, 9, 10, 11, -1).AsByte();
Span<byte> bytes = stackalloc byte[Vector128<byte>.Count];
Shuffle.MmShuffleSpan(ref bytes, control);
Vector128<byte> vcm = Unsafe.As<byte, Vector128<byte>>(ref MemoryMarshal.GetReference(bytes));
fixed (byte* sBase = &source.GetPinnableReference())
fixed (byte* dBase = &dest.GetPinnableReference())
{
byte* s = sBase;
byte* d = dBase;
// TODO: Consider unrolling and shuffling 4 at a time using Ssse3.AlignRight
// See https://stackoverflow.com/questions/2973708/fast-24-bit-array-32-bit-array-conversion
for (int i = 0; i < source.Length; i += 16)
{
Vector128<byte> vs0 = Sse2.LoadVector128(s);
Vector128<byte> val = Sse2.Or(wMask, Ssse3.Shuffle(vs0, padMask));
val = Ssse3.Shuffle(val, vcm);
Sse2.Store(d, val);
s += 12;
d += 16;
}
}
}
}
/// <summary>
/// Performs a multiplication and an addition of the <see cref="Vector256{T}"/>.
/// </summary>

63
src/ImageSharp/Common/Helpers/SimdUtils.Shuffle.cs
View File

@ -18,7 +18,7 @@ namespace SixLabors.ImageSharp
/// <param name="dest">The destination span of floats.</param>
/// <param name="control">The byte control.</param>
[MethodImpl(InliningOptions.ShortMethod)]
public static void Shuffle4Channel(
public static void Shuffle4(
ReadOnlySpan<float> source,
Span<float> dest,
byte control)
@ -26,13 +26,13 @@ namespace SixLabors.ImageSharp
VerifyShuffleSpanInput(source, dest);
#if SUPPORTS_RUNTIME_INTRINSICS
HwIntrinsics.Shuffle4ChannelReduce(ref source, ref dest, control);
HwIntrinsics.Shuffle4Reduce(ref source, ref dest, control);
#endif
// Deal with the remainder:
if (source.Length > 0)
{
ShuffleRemainder4Channel(source, dest, control);
Shuffle4Remainder(source, dest, control);
}
}
@ -44,7 +44,7 @@ namespace SixLabors.ImageSharp
/// <param name="dest">The destination span of bytes.</param>
/// <param name="shuffle">The type of shuffle to perform.</param>
[MethodImpl(InliningOptions.ShortMethod)]
public static void Shuffle4Channel<TShuffle>(
public static void Shuffle4<TShuffle>(
ReadOnlySpan<byte> source,
Span<byte> dest,
TShuffle shuffle)
@ -53,7 +53,7 @@ namespace SixLabors.ImageSharp
VerifyShuffleSpanInput(source, dest);
#if SUPPORTS_RUNTIME_INTRINSICS
HwIntrinsics.Shuffle4ChannelReduce(ref source, ref dest, shuffle.Control);
HwIntrinsics.Shuffle4Reduce(ref source, ref dest, shuffle.Control);
#endif
// Deal with the remainder:
@ -63,7 +63,26 @@ namespace SixLabors.ImageSharp
}
}
public static void ShuffleRemainder4Channel(
[MethodImpl(InliningOptions.ShortMethod)]
public static void Pad3Shuffle4(
ReadOnlySpan<byte> source,
Span<byte> dest,
byte control)
{
VerifyPadShuffleSpanInput(source, dest);
#if SUPPORTS_RUNTIME_INTRINSICS
HwIntrinsics.Pad3Shuffle4Reduce(ref source, ref dest, control);
#endif
// Deal with the remainder:
if (source.Length > 0)
{
Pad3Shuffle4Remainder(source, dest, control);
}
}
public static void Shuffle4Remainder(
ReadOnlySpan<float> source,
Span<float> dest,
byte control)
@ -81,6 +100,24 @@ namespace SixLabors.ImageSharp
}
}
public static void Pad3Shuffle4Remainder(
ReadOnlySpan<byte> source,
Span<byte> dest,
byte control)
{
ref byte sBase = ref MemoryMarshal.GetReference(source);
ref byte dBase = ref MemoryMarshal.GetReference(dest);
Shuffle.InverseMmShuffle(control, out int p3, out int p2, out int p1, out int p0);
for (int i = 0, j = 0; i < dest.Length; i += 4, j += 3)
{
Unsafe.Add(ref dBase, p0 + i) = Unsafe.Add(ref sBase, j);
Unsafe.Add(ref dBase, p1 + i) = Unsafe.Add(ref sBase, j + 1);
Unsafe.Add(ref dBase, p2 + i) = Unsafe.Add(ref sBase, j + 2);
Unsafe.Add(ref dBase, p3 + i) = byte.MaxValue;
}
}
[Conditional("DEBUG")]
private static void VerifyShuffleSpanInput<T>(ReadOnlySpan<T> source, Span<T> dest)
where T : struct
@ -96,6 +133,20 @@ namespace SixLabors.ImageSharp
"Input spans must be divisiable by 4!");
}
[Conditional("DEBUG")]
private static void VerifyPadShuffleSpanInput(ReadOnlySpan<byte> source, Span<byte> dest)
{
DebugGuard.IsTrue(
source.Length == (int)(dest.Length * 3 / 4F),
nameof(source),
"Input spans must be 3/4 the length of the output span!");
DebugGuard.IsTrue(
source.Length % 3 == 0,
nameof(source),
"Input spans must be divisiable by 3!");
}
public static class Shuffle
{
[MethodImpl(InliningOptions.ShortMethod)]

12
src/ImageSharp/PixelFormats/Utils/PixelConverter.cs
View File

@ -27,7 +27,7 @@ namespace SixLabors.ImageSharp.PixelFormats.Utils
/// </summary>
[MethodImpl(InliningOptions.ShortMethod)]
public static void ToArgb32(ReadOnlySpan<byte> source, Span<byte> dest)
=> SimdUtils.Shuffle4Channel<WXYZShuffle4>(source, dest, default);
=> SimdUtils.Shuffle4<WXYZShuffle4>(source, dest, default);
/// <summary>
/// Converts a <see cref="ReadOnlySpan{Byte}"/> representing a collection of
@ -36,7 +36,7 @@ namespace SixLabors.ImageSharp.PixelFormats.Utils
/// </summary>
[MethodImpl(InliningOptions.ShortMethod)]
public static void ToBgra32(ReadOnlySpan<byte> source, Span<byte> dest)
=> SimdUtils.Shuffle4Channel<ZYXWShuffle4>(source, dest, default);
=> SimdUtils.Shuffle4<ZYXWShuffle4>(source, dest, default);
}
public static class FromArgb32
@ -48,7 +48,7 @@ namespace SixLabors.ImageSharp.PixelFormats.Utils
/// </summary>
[MethodImpl(InliningOptions.ShortMethod)]
public static void ToRgba32(ReadOnlySpan<byte> source, Span<byte> dest)
=> SimdUtils.Shuffle4Channel<YZWXShuffle4>(source, dest, default);
=> SimdUtils.Shuffle4<YZWXShuffle4>(source, dest, default);
/// <summary>
/// Converts a <see cref="ReadOnlySpan{Byte}"/> representing a collection of
@ -57,7 +57,7 @@ namespace SixLabors.ImageSharp.PixelFormats.Utils
/// </summary>
[MethodImpl(InliningOptions.ShortMethod)]
public static void ToBgra32(ReadOnlySpan<byte> source, Span<byte> dest)
=> SimdUtils.Shuffle4Channel<WZYXShuffle4>(source, dest, default);
=> SimdUtils.Shuffle4<WZYXShuffle4>(source, dest, default);
}
public static class FromBgra32
@ -69,7 +69,7 @@ namespace SixLabors.ImageSharp.PixelFormats.Utils
/// </summary>
[MethodImpl(InliningOptions.ShortMethod)]
public static void ToArgb32(ReadOnlySpan<byte> source, Span<byte> dest)
=> SimdUtils.Shuffle4Channel<WZYXShuffle4>(source, dest, default);
=> SimdUtils.Shuffle4<WZYXShuffle4>(source, dest, default);
/// <summary>
/// Converts a <see cref="ReadOnlySpan{Byte}"/> representing a collection of
@ -78,7 +78,7 @@ namespace SixLabors.ImageSharp.PixelFormats.Utils
/// </summary>
[MethodImpl(InliningOptions.ShortMethod)]
public static void ToRgba32(ReadOnlySpan<byte> source, Span<byte> dest)
=> SimdUtils.Shuffle4Channel<ZYXWShuffle4>(source, dest, default);
=> SimdUtils.Shuffle4<ZYXWShuffle4>(source, dest, default);
}
}
}

67
tests/ImageSharp.Benchmarks/Color/Bulk/Pad3Shuffle4Channel.cs
View File

@ -0,0 +1,67 @@
// Copyright (c) Six Labors.
// Licensed under the Apache License, Version 2.0.
using System;
using BenchmarkDotNet.Attributes;
namespace SixLabors.ImageSharp.Benchmarks.ColorSpaces.Bulk
{
[Config(typeof(Config.HwIntrinsics_SSE_AVX))]
public class Pad3Shuffle4Channel
{
private byte[] source;
private byte[] destination;
[GlobalSetup]
public void Setup()
{
this.source = new byte[this.Count];
new Random(this.Count).NextBytes(this.source);
this.destination = new byte[this.Count];
}
[Params(96, 384, 768, 1536)]
public int Count { get; set; }
[Benchmark]
public void Shuffle4Channel()
{
SimdUtils.Shuffle4<WXYZShuffle4>(this.source, this.destination, default);
}
}
// 2020-10-29
// ##########
//
// BenchmarkDotNet=v0.12.1, OS=Windows 10.0.19041.572 (2004/?/20H1)
// Intel Core i7-8650U CPU 1.90GHz (Kaby Lake R), 1 CPU, 8 logical and 4 physical cores
// .NET Core SDK=3.1.403
// [Host] : .NET Core 3.1.9 (CoreCLR 4.700.20.47201, CoreFX 4.700.20.47203), X64 RyuJIT
// 1. No HwIntrinsics : .NET Core 3.1.9 (CoreCLR 4.700.20.47201, CoreFX 4.700.20.47203), X64 RyuJIT
// 2. AVX : .NET Core 3.1.9 (CoreCLR 4.700.20.47201, CoreFX 4.700.20.47203), X64 RyuJIT
// 3. SSE : .NET Core 3.1.9 (CoreCLR 4.700.20.47201, CoreFX 4.700.20.47203), X64 RyuJIT
//
// Runtime=.NET Core 3.1
//
// | Method | Job | EnvironmentVariables | Count | Mean | Error | StdDev | Ratio | RatioSD | Gen 0 | Gen 1 | Gen 2 | Allocated |
// |---------------- |------------------- |-------------------------------------------------- |------ |----------:|---------:|---------:|------:|--------:|------:|------:|------:|----------:|
// | Shuffle4Channel | 1. No HwIntrinsics | COMPlus_EnableHWIntrinsic=0,COMPlus_FeatureSIMD=0 | 128 | 17.39 ns | 0.187 ns | 0.175 ns | 1.00 | 0.00 | - | - | - | - |
// | Shuffle4Channel | 2. AVX | Empty | 128 | 21.72 ns | 0.299 ns | 0.279 ns | 1.25 | 0.02 | - | - | - | - |
// | Shuffle4Channel | 3. SSE | COMPlus_EnableAVX=0 | 128 | 18.10 ns | 0.346 ns | 0.289 ns | 1.04 | 0.02 | - | - | - | - |
// | | | | | | | | | | | | | |
// | Shuffle4Channel | 1. No HwIntrinsics | COMPlus_EnableHWIntrinsic=0,COMPlus_FeatureSIMD=0 | 256 | 35.51 ns | 0.711 ns | 0.790 ns | 1.00 | 0.00 | - | - | - | - |
// | Shuffle4Channel | 2. AVX | Empty | 256 | 23.90 ns | 0.508 ns | 0.820 ns | 0.69 | 0.02 | - | - | - | - |
// | Shuffle4Channel | 3. SSE | COMPlus_EnableAVX=0 | 256 | 20.40 ns | 0.133 ns | 0.111 ns | 0.57 | 0.01 | - | - | - | - |
// | | | | | | | | | | | | | |
// | Shuffle4Channel | 1. No HwIntrinsics | COMPlus_EnableHWIntrinsic=0,COMPlus_FeatureSIMD=0 | 512 | 73.39 ns | 0.310 ns | 0.259 ns | 1.00 | 0.00 | - | - | - | - |
// | Shuffle4Channel | 2. AVX | Empty | 512 | 26.10 ns | 0.418 ns | 0.391 ns | 0.36 | 0.01 | - | - | - | - |
// | Shuffle4Channel | 3. SSE | COMPlus_EnableAVX=0 | 512 | 27.59 ns | 0.556 ns | 0.571 ns | 0.38 | 0.01 | - | - | - | - |
// | | | | | | | | | | | | | |
// | Shuffle4Channel | 1. No HwIntrinsics | COMPlus_EnableHWIntrinsic=0,COMPlus_FeatureSIMD=0 | 1024 | 150.64 ns | 2.903 ns | 2.716 ns | 1.00 | 0.00 | - | - | - | - |
// | Shuffle4Channel | 2. AVX | Empty | 1024 | 38.67 ns | 0.801 ns | 1.889 ns | 0.24 | 0.02 | - | - | - | - |
// | Shuffle4Channel | 3. SSE | COMPlus_EnableAVX=0 | 1024 | 47.13 ns | 0.948 ns | 1.054 ns | 0.31 | 0.01 | - | - | - | - |
// | | | | | | | | | | | | | |
// | Shuffle4Channel | 1. No HwIntrinsics | COMPlus_EnableHWIntrinsic=0,COMPlus_FeatureSIMD=0 | 2048 | 315.29 ns | 5.206 ns | 6.583 ns | 1.00 | 0.00 | - | - | - | - |
// | Shuffle4Channel | 2. AVX | Empty | 2048 | 57.37 ns | 1.152 ns | 1.078 ns | 0.18 | 0.01 | - | - | - | - |
// | Shuffle4Channel | 3. SSE | COMPlus_EnableAVX=0 | 2048 | 65.75 ns | 1.198 ns | 1.600 ns | 0.21 | 0.01 | - | - | - | - |
}

2
tests/ImageSharp.Benchmarks/Color/Bulk/ShuffleByte4Channel.cs
View File

@ -26,7 +26,7 @@ namespace SixLabors.ImageSharp.Benchmarks.ColorSpaces.Bulk
[Benchmark]
public void Shuffle4Channel()
{
SimdUtils.Shuffle4Channel<WXYZShuffle4>(this.source, this.destination, default);
SimdUtils.Shuffle4<WXYZShuffle4>(this.source, this.destination, default);
}
}

2
tests/ImageSharp.Benchmarks/Color/Bulk/ShuffleFloat4Channel.cs
View File

@ -27,7 +27,7 @@ namespace SixLabors.ImageSharp.Benchmarks.ColorSpaces.Bulk
[Benchmark]
public void Shuffle4Channel()
{
SimdUtils.Shuffle4Channel(this.source, this.destination, control);
SimdUtils.Shuffle4(this.source, this.destination, control);
}
}

71
tests/ImageSharp.Tests/Common/SimdUtilsTests.Shuffle.cs
View File

@ -22,7 +22,7 @@ namespace SixLabors.ImageSharp.Tests.Common
TestShuffleFloat4Channel(
size,
(s, d) => SimdUtils.Shuffle4Channel(s.Span, d.Span, control),
(s, d) => SimdUtils.Shuffle4(s.Span, d.Span, control),
control);
}
@ -49,43 +49,43 @@ namespace SixLabors.ImageSharp.Tests.Common
WXYZShuffle4 wxyz = default;
TestShuffleByte4Channel(
size,
(s, d) => SimdUtils.Shuffle4Channel(s.Span, d.Span, wxyz),
(s, d) => SimdUtils.Shuffle4(s.Span, d.Span, wxyz),
wxyz.Control);
WZYXShuffle4 wzyx = default;
TestShuffleByte4Channel(
size,
(s, d) => SimdUtils.Shuffle4Channel(s.Span, d.Span, wzyx),
(s, d) => SimdUtils.Shuffle4(s.Span, d.Span, wzyx),
wzyx.Control);
YZWXShuffle4 yzwx = default;
TestShuffleByte4Channel(
size,
(s, d) => SimdUtils.Shuffle4Channel(s.Span, d.Span, yzwx),
(s, d) => SimdUtils.Shuffle4(s.Span, d.Span, yzwx),
yzwx.Control);
ZYXWShuffle4 zyxw = default;
TestShuffleByte4Channel(
size,
(s, d) => SimdUtils.Shuffle4Channel(s.Span, d.Span, zyxw),
(s, d) => SimdUtils.Shuffle4(s.Span, d.Span, zyxw),
zyxw.Control);
var xwyz = new DefaultShuffle4(2, 1, 3, 0);
TestShuffleByte4Channel(
size,
(s, d) => SimdUtils.Shuffle4Channel(s.Span, d.Span, xwyz),
(s, d) => SimdUtils.Shuffle4(s.Span, d.Span, xwyz),
xwyz.Control);
var yyyy = new DefaultShuffle4(1, 1, 1, 1);
TestShuffleByte4Channel(
size,
(s, d) => SimdUtils.Shuffle4Channel(s.Span, d.Span, yyyy),
(s, d) => SimdUtils.Shuffle4(s.Span, d.Span, yyyy),
yyyy.Control);
var wwww = new DefaultShuffle4(3, 3, 3, 3);
TestShuffleByte4Channel(
size,
(s, d) => SimdUtils.Shuffle4Channel(s.Span, d.Span, wwww),
(s, d) => SimdUtils.Shuffle4(s.Span, d.Span, wwww),
wwww.Control);
}
}
@ -97,6 +97,29 @@ namespace SixLabors.ImageSharp.Tests.Common
HwIntrinsics.AllowAll | HwIntrinsics.DisableAVX2 | HwIntrinsics.DisableSSE);
}
[Theory]
[MemberData(nameof(ArraySizesDivisibleBy3))]
public void BulkPad3Shuffle4Channel(int count)
{
static void RunTest(string serialized)
{
// No need to test multiple shuffle controls as the
// pipeline is always the same.
int size = FeatureTestRunner.Deserialize<int>(serialized);
byte control = default(WZYXShuffle4).Control;
TestPad3Shuffle4Channel(
size,
(s, d) => SimdUtils.Pad3Shuffle4(s.Span, d.Span, control),
control);
}
FeatureTestRunner.RunWithHwIntrinsicsFeature(
RunTest,
count,
HwIntrinsics.AllowAll | HwIntrinsics.DisableAVX | HwIntrinsics.DisableSSE);
}
private static void TestShuffleFloat4Channel(
int count,
Action<Memory<float>, Memory<float>> convert,
@ -157,5 +180,37 @@ namespace SixLabors.ImageSharp.Tests.Common
Assert.Equal(expected, result);
}
private static void TestPad3Shuffle4Channel(
int count,
Action<Memory<byte>, Memory<byte>> convert,
byte control)
{
byte[] source = new byte[count];
new Random(count).NextBytes(source);
var result = new byte[(int)(count * (4 / 3F))];
byte[] expected = new byte[result.Length];
SimdUtils.Shuffle.InverseMmShuffle(
control,
out int p3,
out int p2,
out int p1,
out int p0);
for (int i = 0, j = 0; i < expected.Length; i += 4, j += 3)
{
expected[p0 + i] = source[j];
expected[p1 + i] = source[j + 1];
expected[p2 + i] = source[j + 2];
expected[p3 + i] = byte.MaxValue;
}
convert(source, result);
Assert.Equal(expected, result);
}
}
}

2
tests/ImageSharp.Tests/Common/SimdUtilsTests.cs
View File

@ -163,6 +163,8 @@ namespace SixLabors.ImageSharp.Tests.Common
public static readonly TheoryData<int> ArraySizesDivisibleBy8 = new TheoryData<int> { 0, 8, 16, 1024 };
public static readonly TheoryData<int> ArraySizesDivisibleBy4 = new TheoryData<int> { 0, 4, 8, 28, 1020 };
public static readonly TheoryData<int> ArraySizesDivisibleBy3 = new TheoryData<int> { 0, 3, 9, 36, 957 };
public static readonly TheoryData<int> ArraySizesDivisibleBy32 = new TheoryData<int> { 0, 32, 512 };

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