[Bug target/122020] isnan with dfp raises FE_INEXACT

[pinskia at gcc dot gnu.org]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=122020

--- Comment #2 from Andrew Pinski <pinskia at gcc dot gnu.org> ---
Using __builtin_isnan works, this sounds like a bug in lidfp instead.