[Webkit-unassigned] [Bug 147371] New: DFG::PutStackSinkingPhase should be more aggressive about its "no GetStack until put" rule

[bugzilla-daemon at webkit.org]

https://bugs.webkit.org/show_bug.cgi?id=147371

            Bug ID: 147371
           Summary: DFG::PutStackSinkingPhase should be more aggressive
                    about its "no GetStack until put" rule
    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

PutStackSinkingPhase assumes that you won't issue a GetStack until you've already done a PutStack or some other store to that stack location (for example via ForwardVarargs or because it's an argument).  One of the reasons why it currently doesn't enforce this because it's sloppy about using ConflictingFlush, the current signal that the stack slot is dirty.  We should fix both issues.

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