[Webkit-unassigned] [Bug 213687] New: findGCObjectPointersForMarking may have optimization opportunities

[bugzilla-daemon at webkit.org]

https://bugs.webkit.org/show_bug.cgi?id=213687

            Bug ID: 213687
           Summary: findGCObjectPointersForMarking may have optimization
                    opportunities
           Product: WebKit
           Version: WebKit Nightly Build
          Hardware: Unspecified
                OS: Unspecified
            Status: NEW
          Severity: Normal
          Priority: P2
         Component: JavaScriptCore
          Assignee: webkit-unassigned at lists.webkit.org
          Reporter: keith_miller at apple.com

https://bugs.webkit.org/show_bug.cgi?id=213686 indicated it was a 2% perf regression on Speedo2 and JetStream2 to not return early from findGCObjectPointersForMarking after finding a live pointer to some HeapKind::JSCell. Likely, that regression comes from trying to determine if the pointer was live. It's possible most of this is from checking if the different pointers are live. 

Some improvements could be specializing findGCObjectPointersForMarking on the HeapKind or passing all values simultaneously to MarkedBlock::isLive.

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