[Webkit-unassigned] [Bug 56291] New: Could avoid add before checking RegisterFile::end

[bugzilla-daemon at webkit.org]

https://bugs.webkit.org/show_bug.cgi?id=56291

           Summary: Could avoid add before checking RegisterFile::end
           Product: WebKit
           Version: 528+ (Nightly build)
          Platform: PC
        OS/Version: Mac OS X 10.5
            Status: NEW
          Severity: Normal
          Priority: P2
         Component: JavaScriptCore
        AssignedTo: webkit-unassigned at lists.webkit.org
        ReportedBy: barraclough at apple.com


Could remove the add instruction in JIT code when checking RegisterFile end with a red-zone like approach.

E.g. remove RegisterFile::m_end, and replace it with a variable tracking something like RegisterFile::m_endMinus1k, for example - for most functions, this would ensure sufficient space is available, we'd only need to add before checking if the space required was greater than 1k.

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