[Webkit-unassigned] [Bug 153897] New: REGRESSION(192409): Cannot rely on add32() to zero-extend

[bugzilla-daemon at webkit.org]

https://bugs.webkit.org/show_bug.cgi?id=153897

            Bug ID: 153897
           Summary: REGRESSION(192409): Cannot rely on add32() to
                    zero-extend
    Classification: Unclassified
           Product: WebKit
           Version: WebKit Nightly Build
          Hardware: All
                OS: All
            Status: NEW
          Severity: Normal
          Priority: P2
         Component: JavaScriptCore
          Assignee: webkit-unassigned at lists.webkit.org
          Reporter: fpizlo at apple.com

Callers of add32() and other 32-bit arithmetic ops rely on the fact that the destination register is zero-extended.  The optimizations in r192409 broke this feature, and this causes crashes on some obscure code.

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