[Bug 294692] lib/msun: Replaced manual checks with isnan()

https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=3D294692

--- Comment #4 from Jes=C3=BAs Cipriano Bl=C3=A1zquez Mart=C3=ADnez <jesusc=
[email protected]> ---
(In reply to Robert Clausecker from comment #3)

I believe it is only NaN check, but since they have to extract the absolute
value for the function anyway, they are using it to save a bit of performan=
ce
at the cost of legibility.=20

(ix>=3D0x7ff00000) is equal to ux.exp=3D=3D 0x7ff and ((ix-0x7ff00000)|lx)!=
=3D0) is
checking the mantissa isn't 0.

I do agree that maybe it is better to leave the checks in those functions as
they were, or to do as Kargl said and move them before the EXTRACT_WORDS. I
don't know what would be better.

--=20
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