[Webkit-unassigned] [Bug 67554] New: DFG variable predictions only work for local variables, not temporaries

[bugzilla-daemon at webkit.org]

https://bugs.webkit.org/show_bug.cgi?id=67554

           Summary: DFG variable predictions only work for local
                    variables, not temporaries
           Product: WebKit
           Version: 528+ (Nightly build)
          Platform: All
        OS/Version: All
            Status: NEW
          Severity: Normal
          Priority: P2
         Component: JavaScriptCore
        AssignedTo: webkit-unassigned at lists.webkit.org
        ReportedBy: fpizlo at apple.com


The local variable prediction code in DFG::Graph does not work for temporaries, even though it easily could, and probably should.  This causes speculation logic to be overly conservative if a temporary is live across multiple basic blocks.

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