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https://github.com/oliverbooth/X10D
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Fast Int16 packing
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RealityProgrammer
parent
5e4044f965
commit
6f343cd393
@ -6,13 +6,6 @@ namespace X10D.Tests.Collections;
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[TestClass]
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public class BoolListTests
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{
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[TestMethod]
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public void Pack8BitSpan_Should_Pack_Correctly()
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{
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Span<bool> span = stackalloc bool[8] { true, false, true, false, true, false, true, false };
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Assert.AreEqual(85, span.PackByte()); // 01010101
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}
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[TestMethod]
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public void Pack8Bit_Should_Pack_Correctly()
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{
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@ -1,11 +1,13 @@
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using System.Diagnostics.Contracts;
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using System.Runtime.CompilerServices;
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using System.Runtime.InteropServices;
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using System.Numerics;
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#if NETCOREAPP3_0_OR_GREATER
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using X10D.Core;
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using System.Runtime.Intrinsics;
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using System.Runtime.Intrinsics.Arm;
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using System.Runtime.Intrinsics.X86;
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using System.Runtime.Intrinsics.Arm;
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#endif
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namespace X10D.Core;
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@ -134,52 +136,38 @@ public static class SpanExtensions
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case > 8: throw new ArgumentException("Source cannot contain more than 8 elements.", nameof(source));
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case 8:
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#if NETSTANDARD2_1
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// TODO: Think of a way to do fast boolean correctness.
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// TODO: Think of a way to do fast boolean correctness without using SIMD API.
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goto default;
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#else
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unsafe
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{
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ulong reinterpret;
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// Boolean correctness.
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fixed (bool* pSource = source) {
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if (Sse2.IsSupported)
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{
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fixed (bool* pSource = source)
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{
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var vec = Sse2.LoadScalarVector128((ulong*)pSource).AsByte();
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var cmp = Sse2.CompareEqual(vec, Vector128<byte>.Zero);
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var correctness = Sse2.AndNot(cmp, Vector128.Create((byte)1));
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reinterpret = correctness.AsUInt64().GetElement(0);
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}
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reinterpret = Sse2.LoadScalarVector128((ulong*)pSource).AsByte().CorrectBoolean().AsUInt64().GetElement(0);
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}
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else if (AdvSimd.IsSupported)
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{
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// Haven't tested since March 6th 2023 (Reason: Unavailable hardware).
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fixed (bool* pSource = source)
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{
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var vec = AdvSimd.LoadVector64((byte*)pSource);
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var cmp = AdvSimd.CompareEqual(vec, Vector64<byte>.Zero);
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var correctness = AdvSimd.BitwiseSelect(cmp, vec, Vector64<byte>.Zero);
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reinterpret = Unsafe.As<Vector64<byte>, ulong>(ref correctness);
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}
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// Hasn't been tested since March 6th 2023 (Reason: Unavailable hardware).
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reinterpret = AdvSimd.LoadVector64((byte*)pSource).CorrectBoolean().AsUInt64().GetElement(0);
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}
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else
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{
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goto default;
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}
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}
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if (BitConverter.IsLittleEndian)
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{
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const ulong magic = 0b0000_0001_0000_0010_0000_0100_0000_1000_0001_0000_0010_0000_0100_0000_1000_0000;
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const ulong magic = 0x0102040810204080;
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return unchecked((byte)(magic * reinterpret >> 56));
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}
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else
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{
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// Haven't tested since March 6th 2023 (Reason: Unavailable hardware).
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const ulong magic = 0b1000_0000_0100_0000_0010_0000_0001_0000_0000_1000_0000_0100_0000_0010_0000_0001;
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// Hasn't been tested since March 6th 2023 (Reason: Unavailable hardware).
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const ulong magic = 0x8040201008040201;
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return unchecked((byte)(magic * reinterpret >> 56));
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}
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}
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@ -195,4 +183,175 @@ public static class SpanExtensions
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return result;
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}
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}
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/// <summary>
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/// Packs a <see cref="Span{T}"/> of booleans into a <see cref="short" />.
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/// </summary>
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/// <param name="source">The span of booleans to pack.</param>
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/// <returns>A 16-bit signed integer containing the packed booleans.</returns>
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/// <exception cref="ArgumentException"><paramref name="source" /> contains more than 16 elements.</exception>
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[Pure]
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[MethodImpl(MethodImplOptions.AggressiveInlining)]
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public static short PackInt16(this Span<bool> source)
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{
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return PackInt16((ReadOnlySpan<bool>)source);
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}
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/// <summary>
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/// Packs a <see cref="ReadOnlySpan{T}"/> of booleans into a <see cref="short" />.
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/// </summary>
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/// <param name="source">The span of booleans to pack.</param>
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/// <returns>A 16-bit signed integer containing the packed booleans.</returns>
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/// <exception cref="ArgumentException"><paramref name="source" /> contains more than 16 elements.</exception>
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[Pure]
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public static short PackInt16(this ReadOnlySpan<bool> source)
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{
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switch (source.Length)
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{
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case > 16: throw new ArgumentException("Source cannot contain more than than 16 elements.", nameof(source));
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case 16:
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#if NETSTANDARD2_1
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// TODO: Think of a way to do fast boolean correctness without using SIMD API.
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goto default;
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#else
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unsafe
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{
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ulong reinterpret1, reinterpret2;
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fixed (bool* pSource = source)
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{
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if (Sse2.IsSupported)
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{
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var vector = Sse2.LoadVector128((byte*)pSource).CorrectBoolean().AsUInt64();
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reinterpret1 = vector.GetElement(0);
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reinterpret2 = vector.GetElement(1);
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}
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else if (AdvSimd.IsSupported)
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{
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// Hasn't been tested since March 6th 2023 (Reason: Unavailable hardware).
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var vector = AdvSimd.LoadVector128((byte*)pSource).CorrectBoolean().AsUInt64();
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reinterpret1 = vector.GetElement(0);
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reinterpret2 = vector.GetElement(1);
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}
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else
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{
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goto default;
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}
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}
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if (BitConverter.IsLittleEndian)
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{
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const ulong magic = 0x0102040810204080;
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ulong calc1 = unchecked(magic * reinterpret1 >> 56);
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ulong calc2 = unchecked(magic * reinterpret2 >> 56);
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return (short)(calc1 | (calc2 << 8));
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}
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else
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{
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// Hasn't been tested since March 6th 2023 (Reason: Unavailable hardware).
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const ulong magic = 0x8040201008040201;
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ulong calc1 = unchecked(magic * reinterpret1 >> 56);
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ulong calc2 = unchecked(magic * reinterpret2 >> 56);
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return (short)(calc2 | (calc1 << 8));
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}
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}
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#endif
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default:
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short result = 0;
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for (var i = 0; i < source.Length; i++)
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{
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result |= (short)(source[i] ? 1 << i : 0);
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}
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return result;
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}
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}
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/// <summary>
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/// Packs a <see cref="Span{T}"/> of booleans into a <see cref="int" />.
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/// </summary>
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/// <param name="source">The span of booleans to pack.</param>
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/// <returns>A 32-bit signed integer containing the packed booleans.</returns>
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/// <exception cref="ArgumentException"><paramref name="source" /> contains more than 32 elements.</exception>
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[Pure]
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[MethodImpl(MethodImplOptions.AggressiveInlining)]
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public static int PackInt32(this Span<bool> source)
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{
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return PackInt32((ReadOnlySpan<bool>)source);
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}
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/// <summary>
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/// Packs a <see cref="ReadOnlySpan{T}"/> of booleans into a <see cref="int" />.
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/// </summary>
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/// <param name="source">The span of booleans to pack.</param>
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/// <returns>A 32-bit signed integer containing the packed booleans.</returns>
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/// <exception cref="ArgumentException"><paramref name="source" /> contains more than 32 elements.</exception>
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[Pure]
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public static int PackInt32(this ReadOnlySpan<bool> source)
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{
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switch (source.Length)
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{
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case > 32: throw new ArgumentException("Source cannot contain more than than 32 elements.", nameof(source));
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case 32:
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// TODO: Accelerate this.
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goto default;
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default:
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int result = 0;
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for (var i = 0; i < source.Length; i++)
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{
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result |= source[i] ? 1 << i : 0;
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}
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return result;
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}
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}
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/// <summary>
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/// Packs a <see cref="Span{T}"/> of booleans into a <see cref="long" />.
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/// </summary>
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/// <param name="source">The span of booleans to pack.</param>
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/// <returns>A 64-bit signed integer containing the packed booleans.</returns>
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/// <exception cref="ArgumentException"><paramref name="source" /> contains more than 64 elements.</exception>
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[Pure]
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[MethodImpl(MethodImplOptions.AggressiveInlining)]
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public static long PackInt64(this Span<bool> source)
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{
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return PackInt64((ReadOnlySpan<bool>)source);
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}
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/// <summary>
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/// Packs a <see cref="ReadOnlySpan{T}"/> of booleans into a <see cref="long" />.
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/// </summary>
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/// <param name="source">The span of booleans to pack.</param>
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/// <returns>A 64-bit signed integer containing the packed booleans.</returns>
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/// <exception cref="ArgumentException"><paramref name="source" /> contains more than 64 elements.</exception>
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[Pure]
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public static long PackInt64(this ReadOnlySpan<bool> source)
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{
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switch (source.Length)
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{
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case > 64: throw new ArgumentException("Source cannot contain more than than 64 elements.", nameof(source));
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case 64:
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// TODO: Accelerate this.
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goto default;
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default:
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long result = 0;
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for (var i = 0; i < source.Length; i++)
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{
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result |= source[i] ? 1U << i : 0;
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}
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return result;
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}
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}
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}
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