[Webkit-unassigned] [Bug 70578] New: DFG should not try to predict argument types by looking at the values of argument registers at the time of compilation

[bugzilla-daemon at webkit.org]

https://bugs.webkit.org/show_bug.cgi?id=70578

           Summary: DFG should not try to predict argument types by
                    looking at the values of argument registers at the
                    time of compilation
           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


DFG is invoked from loops or when a function returns.  By that point, the registers holding arguments may hold a different value than what the arguments would have held at the prologue.  Hence it is unprofitable to try to augment argument predictions by looking at argument registers at time of compilation.

This is also an opportunity to kill some code.

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