[Webkit-unassigned] [Bug 253286] New: Fix F32/F64Copysign on Intel in single-pass BBQ JIT

[bugzilla-daemon at webkit.org]

https://bugs.webkit.org/show_bug.cgi?id=253286

            Bug ID: 253286
           Summary: Fix F32/F64Copysign on Intel in single-pass BBQ JIT
           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

rdar://106173548

The implementations for F32 and F64 copying on Intel move a mask into the result register, then AND it with the left operand register. If the result and left operand registers are the same, then this clobbers the left operand with the immediate, producing an incorrect answer.

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