[Webkit-unassigned] [Bug 83678] New: Global variable predictions should not be coalesced unnecessarily

[bugzilla-daemon at webkit.org]

https://bugs.webkit.org/show_bug.cgi?id=83678

           Summary: Global variable predictions should not be coalesced
                    unnecessarily
           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


The DFG still coalesces all predictions for all global variables even though it isn't strictly necessary.  This is a holdover from when we would sometimes compile code without having complete predictions for the entire code block, and would have no way of recompiling later - so we needed to play strange games to "fill in" predictions for those parts of the code block that we wanted to optimize but for which we had no profiling data.  But these days we either manager to get all of the profiling we need before compiling things (because of our well now mature heuristics) or we trigger recompilation upon repeated attempts to execute code that did not have profiling data.  Either way, in steady state, all running DFG code will have ample profiling information.

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