[Webkit-unassigned] [Bug 69734] New: Improve Null or Undefined test in 32_64 DFG

[bugzilla-daemon at webkit.org]

https://bugs.webkit.org/show_bug.cgi?id=69734

           Summary: Improve Null or Undefined test in 32_64 DFG
           Product: WebKit
           Version: 528+ (Nightly build)
          Platform: Unspecified
        OS/Version: Unspecified
            Status: UNCONFIRMED
          Severity: Normal
          Priority: P2
         Component: JavaScriptCore
        AssignedTo: webkit-unassigned at lists.webkit.org
        ReportedBy: yuqiang.xian at intel.com
                CC: barraclough at apple.com, fpizlo at apple.com


Currently Null or Undefined value test in 32_64 DFG will check Null and Undefined tag separately and introduce one more branch. It can be improved in the way how the baseline JIT is doing - by relying on the fact that "UndefinedTag + 1 == NullTag and NullTag & 1".

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