[Webkit-unassigned] [Bug 150454] New: Air needs to know which subset of an argument an operation will use or def

[bugzilla-daemon at webkit.org]

https://bugs.webkit.org/show_bug.cgi?id=150454

            Bug ID: 150454
           Summary: Air needs to know which subset of an argument an
                    operation will use or def
    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

That would allow us to spill it more compactly and emit tighter code in general.

It would also be cool if Def32 could be made to clearly imply that the high bits are zero'd, since that would allow us to eliminate more zero extensions from the code.

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