[Webkit-unassigned] [Bug 68677] New: The DFG should not attempt to guess types in the absence of value profiles

[bugzilla-daemon at webkit.org]

https://bugs.webkit.org/show_bug.cgi?id=68677

           Summary: The DFG should not attempt to guess types in the
                    absence of value profiles
           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 DFG still has a bunch of code to try to guess the types of variables without knowing any information about how the code will run.  This is unnecessary now that we have continuous optimization.  The DFG should never attempt to speculate statically; instead points in the code where no sensible speculation can be made should turn into immediate OSR points into the old JIT.

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