[Webkit-unassigned] [Bug 253307] New: Something not quite right with SIMD

[bugzilla-daemon at webkit.org]

https://bugs.webkit.org/show_bug.cgi?id=253307

            Bug ID: 253307
           Summary: Something not quite right with SIMD
           Product: WebKit
           Version: Safari Technology Preview
          Hardware: Unspecified
                OS: Unspecified
            Status: NEW
          Severity: Normal
          Priority: P2
         Component: WebAssembly
          Assignee: webkit-unassigned at lists.webkit.org
          Reporter: jaffathecake at gmail.com

Created attachment 465278

  --> https://bugs.webkit.org/attachment.cgi?id=465278&action=review

Safari Screenshot

Apologies for the vague description and lack of reduced case.

On https://squoosh.app we use SIMD in our WebP encoder if the browser supports it, which Safari TP 164 now uses. Unfortunately it seems to corrupt the resulting image.

1. Go to https://squoosh.app.
2. Select the logo image (the final of the demo images).
3. Instead of MozJPEG, select WebP.

In Safari TP 164, I see strange artifacts in the image. I don't see these artifacts in Chrome or Firefox, which also use the SIMD encoder.

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