RESOLVED DUPLICATE of bug 183449 172685
[JSC] Move WebCore jsDynamicDowncast mechanism to JSC 
https://bugs.webkit.org/show_bug.cgi?id=172685
Summary [JSC] Move WebCore jsDynamicDowncast mechanism to JSC
Yusuke Suzuki
Reported 2017-05-28 04:27:30 PDT
We have bunch of adhoc functions, like, isSymbol, asSymbol, isJSMap etc. We may easily miss the chance to use optimized casting. For example, jsDynamicCast<JSMap*>(vm, iterable) If we do not have a fast overloading function (checking type() == JSMapType), it falls back to the usual slow inherits() code.
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Yusuke Suzuki
Comment 1 2018-04-01 12:26:12 PDT
We already did it. *** This bug has been marked as a duplicate of bug 183449 ***
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