[Webkit-unassigned] [Bug 86580] New: DFG should have sparse conditional constant propagation

[bugzilla-daemon at webkit.org]

https://bugs.webkit.org/show_bug.cgi?id=86580

           Summary: DFG should have sparse conditional constant
                    propagation
           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


Without it, we won't be able to make this loop evaporate, because the CFA will execute the "i++" basic block and pollute i.

for (var i = 0; i < 1; ++i) doThings(i);

Patch forthcoming, though I foresee this generating some bugs, so though the patch is simple it'll probably take a while to fully bake.

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