[Webkit-unassigned] [Bug 141624] New: DFG::PutLocalSinkingPhase should eliminate GetLocals that have an obviously known source

[bugzilla-daemon at webkit.org]

https://bugs.webkit.org/show_bug.cgi?id=141624

            Bug ID: 141624
           Summary: DFG::PutLocalSinkingPhase should eliminate GetLocals
                    that have an obviously known source
    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 if we have a PutLocal/GetLocal pair, then we will sink the PutLocal to the GetLocal.  Instead, we should eliminate the GetLocal entirely.

Probably this doesn't arise too much because we would have done some CSE, but it would be best if we just did the right thing here.

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