[Bug middle-end/66462] GCC isinf/isnan/... builtins cause sNaN exceptions

[segher at gcc dot gnu.org]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=66462

--- Comment #15 from Segher Boessenkool <segher at gcc dot gnu.org> ---
(In reply to joseph@codesourcery.com from comment #13)
> These functions have to be expanded inline, unconditionally; there are no 
> library functions they can reliably fall back on in general.

Ugh, yes.  There probably *should* be, but oh well.