[Webkit-unassigned] [Bug 68177] New: The DFG non-speculative JIT is no longer used and should be removed.

[bugzilla-daemon at webkit.org]

https://bugs.webkit.org/show_bug.cgi?id=68177

           Summary: The DFG non-speculative JIT is no longer used and
                    should be removed.
           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


Tiered compilation is enabled in ToT and produces a pure win.  Tiered compilation does not use the non-speculative JIT.  The non-speculative JIT is not used by anyone.  It should be removed.

This also implies removing the spec->non-spec failure code (since we now use OSR instead), the SpeculationCheck code (since we now use OSRExit instead), and any configuration options in DFGNode or elsewhere that pertain to non-speculative.

As part of its removal, any useful functionality that it did have that we intend on using in the speculative JIT should be transformed into a helper function on JITCodeGenerator.

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