[Webkit-unassigned] [Bug 189507] New: [JSC] Optimize Array#indexOf in C++ runtime

[bugzilla-daemon at webkit.org]

https://bugs.webkit.org/show_bug.cgi?id=189507

            Bug ID: 189507
           Summary: [JSC] Optimize Array#indexOf in C++ runtime
           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: yusukesuzuki at slowstart.org

web-tooling-benchmark babylon shows that C++ runtime of Array#indexOf takes so much time (According to Linux perf, it shows 6.9% of the main thread, lol).
Our C++ Array#indexOf is too naive. It repeatedly calls getProperty function, which is not so fast.

We can add a fast path for JSArray, which should be similar to the thing implemented in DFG / FTL.

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