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@lewing lewing commented Aug 1, 2023

After #88532 The code prefers Vector512/Vector256/AdvSimd but then falls back to Vector rather than Vector128 which is implemented in the _Vector method

(I didn't actually check the Vector128 path closely)

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Author: lewing
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area-System.Text.Encoding

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@lewing lewing marked this pull request as ready for review August 1, 2023 17:24
@lewing lewing requested review from anthonycanino and kg August 1, 2023 17:27
{
return GetIndexOfFirstNonAsciiByte_Intrinsified(pBuffer, bufferLength);
}
else if (Vector128.IsHardwareAccelerated)
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The above Sse2 or AdvSimd paths are the code paths that use Vector128 and are much more efficient than the associated Vector128 path.

I believe if it reaches this point, where we cannot use Vector512, Vector256, or Sse2/AdvSimd, then the Vector path itself will likely be as efficient and no need to call back into _Vector.

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We would prefer the Vector128 path for wasm

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Ok, understood. Thanks for the context.

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LGTM. This just adds to the reasons why having a single shared implementation using the xplat APIs is goodness.

@stephentoub stephentoub merged commit 3be370e into dotnet:main Aug 4, 2023
@lewing lewing deleted the vector128 branch August 5, 2023 01:30
@ghost ghost locked as resolved and limited conversation to collaborators Sep 4, 2023
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5 participants