[Webkit-unassigned] [Bug 174523] New: JSC should optimize polymorphic prototypes

[bugzilla-daemon at webkit.org]

https://bugs.webkit.org/show_bug.cgi?id=174523

            Bug ID: 174523
           Summary: JSC should optimize polymorphic prototypes
           Product: WebKit
           Version: WebKit Nightly Build
          Hardware: All
                OS: All
            Status: NEW
          Severity: Normal
          Priority: P2
         Component: JavaScriptCore
          Assignee: webkit-unassigned at lists.webkit.org
          Reporter: fpizlo at apple.com

This idiom is currently slow in JSC:

    function foo()
    {
        class Helper {
            ... things ...
        }

        let h = new Helper();
        ... things with h ...
    }

    ... call foo() many times ...

We should make it fast.

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