[Webkit-unassigned] [Bug 65397] New: LayoutTests does not have a test for array speculation pathologies in the JavaScriptCore DFG JIT

[bugzilla-daemon at webkit.org]

https://bugs.webkit.org/show_bug.cgi?id=65397

           Summary: LayoutTests does not have a test for array speculation
                    pathologies in the JavaScriptCore DFG JIT
           Product: WebKit
           Version: 528+ (Nightly build)
          Platform: All
        OS/Version: All
            Status: NEW
          Severity: Normal
          Priority: P2
         Component: Tools / Tests
        AssignedTo: webkit-unassigned at lists.webkit.org
        ReportedBy: fpizlo at apple.com


The JavaScriptCore DFG JIT may speculate that a value is an array.  The code is relatively tricky, since a distinction is made between speculating that a variable is an array throughout the entire procedure, versus speculating that a variable happens to reference an array during the course of a particular array access.  The latter code path has not been exercised in existing tests, so a new test is needed.

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