[Bug math/20033] [x86_64] vectorized math function don't call the __finite versions

["andrew.n.senkevich at gmail dot com" <sourceware-bugzilla at sourceware dot org>]

https://sourceware.org/bugzilla/show_bug.cgi?id=20033

--- Comment #2 from Andrew Senkevich <andrew.n.senkevich at gmail dot com> ---
(In reply to Julian Taylor from comment #1)
> I disagree with this. The scalar fallback allows me to have equal results to
> scalar math for non finite inputs which makes them much more useful for
> general purpose libraries.
> 
> Currently also with vector math pow(nan, 0) will give me 1 as I would with
> scalar math. If you call pow_finite this property is probably not retained.

Yes, finite version of pow(nan, 0) returns qNaN instead of 1.0.

And it was a reason to exclude that testcases in the patch -
https://sourceware.org/ml/libc-alpha/2016-07/msg00213.html :)

If current way already used somewhere and it is helpful lets stay it as is?

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