[Webkit-unassigned] [Bug 154124] New: MacroAssemblerX86 should be happy with shift(cx, cx)

[bugzilla-daemon at webkit.org]

https://bugs.webkit.org/show_bug.cgi?id=154124

            Bug ID: 154124
           Summary: MacroAssemblerX86 should be happy with shift(cx, cx)
    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

It currently asserts that shift_amount and dest cannot be the same.  That's a good assertion for when shift_amount is not in cx.  But if it's in cx already then it's OK for them to be the same.  Air will sometimes do shift(cx, cx) if you do "x << x" and the coalescing got particularly clever.

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