Background and motivation
I hit lack of these crossplatform helpers when I was doing "parse hex" work in #82521 - ended up with local functions. These APIs seem to present in SSE/AVX and AdvSimd and can be easily exposed as cross-platform helpers. Some places in BCL might benefit from this too, e.g.
|
if (AdvSimd.IsSupported) |
|
{ |
|
charIsThreeByteUtf8Encoded = AdvSimd.AddSaturate(utf16Data, vector7800); |
|
mask = GetNonAsciiBytes(AdvSimd.Or(charIsNonAscii, charIsThreeByteUtf8Encoded).AsByte(), bitMask128); |
|
} |
|
else |
|
{ |
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charIsThreeByteUtf8Encoded = Sse2.AddSaturate(utf16Data, vector7800); |
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mask = (uint)Sse2.MoveMask(Sse2.Or(charIsNonAscii, charIsThreeByteUtf8Encoded).AsByte()); |
|
} |
API Proposal
namespace System.Numerics;
public static class Vector
{
+ public static Vector<T> AddSaturate<T> (Vector<T> left, Vector<T> right) where T : struct;
+ public static Vector<T> SubtractSaturate<T>(Vector<T> left, Vector<T> right) where T : struct;
}
namespace System.Runtime.Intrinsics;
public static class Vector64
{
+ public static Vector64<T> AddSaturate<T> (Vector64<T> left, Vector64<T> right) where T : struct;
+ public static Vector64<T> SubtractSaturate<T>(Vector64<T> left, Vector64<T> right) where T : struct;
}
public static class Vector128
{
+ public static Vector128<T> AddSaturate<T> (Vector128<T> left, Vector128<T> right) where T : struct;
+ public static Vector128<T> SubtractSaturate<T>(Vector128<T> left, Vector128<T> right) where T : struct;
}
public static class Vector256
{
+ public static Vector256<T> AddSaturate<T> (Vector256<T> left, Vector256<T> right) where T : struct;
+ public static Vector256<T> SubtractSaturate<T>(Vector256<T> left, Vector256<T> right) where T : struct;
}
public static class Vector512
{
+ public static Vector512<T> AddSaturate<T> (Vector512<T> left, Vector512<T> right) where T : struct;
+ public static Vector512<T> SubtractSaturate<T>(Vector512<T> left, Vector512<T> right) where T : struct;
}NOTE: SSE and AVX only accelerate byte, sbyte, short and ushort. AdvSimd supports more types.
Background and motivation
I hit lack of these crossplatform helpers when I was doing "parse hex" work in #82521 - ended up with local functions. These APIs seem to present in SSE/AVX and AdvSimd and can be easily exposed as cross-platform helpers. Some places in BCL might benefit from this too, e.g.
runtime/src/libraries/System.Private.CoreLib/src/System/Text/Unicode/Utf16Utility.Validation.cs
Lines 133 to 142 in 220437e
API Proposal
namespace System.Numerics; public static class Vector { + public static Vector<T> AddSaturate<T> (Vector<T> left, Vector<T> right) where T : struct; + public static Vector<T> SubtractSaturate<T>(Vector<T> left, Vector<T> right) where T : struct; } namespace System.Runtime.Intrinsics; public static class Vector64 { + public static Vector64<T> AddSaturate<T> (Vector64<T> left, Vector64<T> right) where T : struct; + public static Vector64<T> SubtractSaturate<T>(Vector64<T> left, Vector64<T> right) where T : struct; } public static class Vector128 { + public static Vector128<T> AddSaturate<T> (Vector128<T> left, Vector128<T> right) where T : struct; + public static Vector128<T> SubtractSaturate<T>(Vector128<T> left, Vector128<T> right) where T : struct; } public static class Vector256 { + public static Vector256<T> AddSaturate<T> (Vector256<T> left, Vector256<T> right) where T : struct; + public static Vector256<T> SubtractSaturate<T>(Vector256<T> left, Vector256<T> right) where T : struct; } public static class Vector512 { + public static Vector512<T> AddSaturate<T> (Vector512<T> left, Vector512<T> right) where T : struct; + public static Vector512<T> SubtractSaturate<T>(Vector512<T> left, Vector512<T> right) where T : struct; }NOTE: SSE and AVX only accelerate
byte,sbyte,shortandushort. AdvSimd supports more types.