[Webkit-unassigned] [Bug 88261] New: DFG arguments simplification takes unkindly to direct accesses to the arguments register

[bugzilla-daemon at webkit.org]

https://bugs.webkit.org/show_bug.cgi?id=88261

           Summary: DFG arguments simplification takes unkindly to direct
                    accesses to the arguments register
           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


And by "takes unkindly" I mean that it either crashes during JITing or generates hopelessly wrong code.

It turns out that we had basically no coverage over what happens if a function uses arguments and is otherwise so trivial that CSE doesn't run.

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