[Webkit-unassigned] [Bug 248995] New: [WebAssembly SIMD] Emulate 8-bit shift instructions and i8x16.popcnt on Intel

[bugzilla-daemon at webkit.org]

https://bugs.webkit.org/show_bug.cgi?id=248995

            Bug ID: 248995
           Summary: [WebAssembly SIMD] Emulate 8-bit shift instructions
                    and i8x16.popcnt on Intel
           Product: WebKit
           Version: WebKit Nightly Build
          Hardware: Unspecified
                OS: Unspecified
            Status: NEW
          Severity: Normal
          Priority: P2
         Component: WebAssembly
          Assignee: webkit-unassigned at lists.webkit.org
          Reporter: d_degazio at apple.com

While most other SIMD bitwise operations are tracked in https://bugs.webkit.org/show_bug.cgi?id=248639, I'm splitting off the following instructions:

 - i8x16.shl, i8x16.shr_s, i8x16.shr_u
 - i8x16.popcnt

into this bug so they don't hold up the other patch. None of these instructions are supported natively on Intel, at least without AVX-512, and they also
aren't easy to emulate. So they require some additional effort to implement necessary supporting instructions and figure out the best isel.

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