[Webkit-unassigned] [Bug 70687] New: Typed arrays are 10X slower than normal classic arrays

[bugzilla-daemon at webkit.org]

https://bugs.webkit.org/show_bug.cgi?id=70687

           Summary: Typed arrays are 10X slower than normal classic arrays
           Product: WebKit
           Version: 528+ (Nightly build)
          Platform: Macintosh Intel
               URL: http://jsperf.com/read-write-typed-arrays/2
        OS/Version: Mac OS X 10.7
            Status: UNCONFIRMED
          Severity: Minor
          Priority: P3
         Component: JavaScriptCore
        AssignedTo: webkit-unassigned at lists.webkit.org
        ReportedBy: jhuckaby at gmail.com


Using a simple for loop reading and writing single values from typed arrays vs. normal arrays, the performance difference is staggering.  Typed arrays are all about 10X slower than normal arrays.  This strange behavior only occurs in Safari (running the very same test in Chrome and Firefox the typed arrays win outright, as they should).

See the test page for details and source code: http://jsperf.com/read-write-typed-arrays/2

Reproduced in Safari 5.1, 5.11 and WebKit Nightly Build (Oct 18 2011) on OS X 10.7.2.

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