[Webkit-unassigned] [Bug 143733] New: Rationalize DFG OSR exit liveness

[bugzilla-daemon at webkit.org]

https://bugs.webkit.org/show_bug.cgi?id=143733

            Bug ID: 143733
           Summary: Rationalize DFG OSR exit liveness
    Classification: Unclassified
           Product: WebKit
           Version: 528+ (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

Currently we keep things that are dead-in-DFG alive for OSR by using Phantoms.  Phantoms are fine as a backend hack in the DFG, but they are really hard to preserve soundly through serious compiler transformations.  We should rationalize this so that we have fewer bugs to fix.

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