[Webkit-unassigned] [Bug 129479] Implement Number.prototype.clz()

[bugzilla-daemon at webkit.org]

https://bugs.webkit.org/show_bug.cgi?id=129479





--- Comment #2 from Anders Carlsson <andersca at apple.com>  2014-02-28 06:44:40 PST ---
(From update of attachment 225453)
View in context: https://bugs.webkit.org/attachment.cgi?id=225453&action=review

> Source/JavaScriptCore/runtime/NumberPrototype.cpp:472
> +    int zeroCount = 0;
> +    for (int i = 31; i >= 0; i--) {
> +        if (!(number >> i))
> +            zeroCount++;
> +        else
> +            break;
> +    }
> +    return JSValue::encode(jsString(exec, String::numberToStringECMAScript(zeroCount)));

I think this should be a separate function and also use __builtin_clz when building with compilers that support it (GCC, clang).

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