[Webkit-unassigned] [Bug 258302] New: WebAssembly SIMD results in incorrect float values and non working bitwise operations

[bugzilla-daemon at webkit.org]

https://bugs.webkit.org/show_bug.cgi?id=258302

            Bug ID: 258302
           Summary: WebAssembly SIMD results in incorrect float values and
                    non working bitwise operations
           Product: WebKit
           Version: Safari 16
          Hardware: iPhone / iPad
                OS: iOS 16
            Status: NEW
          Severity: Major
          Priority: P2
         Component: WebAssembly
          Assignee: webkit-unassigned at lists.webkit.org
          Reporter: john at terraspace.co.uk

I've not yet been able to narrow down the exact instructions that cause the issues, but something is very broken. I've noticed incorrect float values after some arithmetic operations, and my suspicion is that something
with package integer bitwise ops and comparisons is not working as expected.

The same code works on Chrome/Android/PC/Edge and Safari on Mac.
(IE. everything else).

The following site demonstrates the issues:
https://www.terraspace.co.uk

For which the output is identical everywhere except iOS 16.x (since wasm simd supported landed).
Blocks of 4x pixels are not masking and updating as they should be.

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