[Webkit-unassigned] [Bug 68186] New: All of the functionality in the non-speculative JIT should be available to the speculative JIT via helper methods

[bugzilla-daemon at webkit.org]

https://bugs.webkit.org/show_bug.cgi?id=68186

           Summary: All of the functionality in the non-speculative JIT
                    should be available to the speculative JIT via helper
                    methods
           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


In some cases the speculative JIT may have evidence that speculating on the type of a particular variable is unprofitable.  In those cases it's likely to make sense to emit what the non-speculative JIT would have emitted, but only for uses of that variable.  Doing this requires having the non-speculative JIT's code generator available on a per-opcode basis in the form of helper methods in JITCodeGenerator.

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