[Bug c/94981] Wrong casts on Power machines dealing with fctiwuz instruction

[pinskia at gcc dot gnu.org]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=94981

--- Comment #6 from Andrew Pinski <pinskia at gcc dot gnu.org> ---
Report the bug to boost then.  BOOST is broken and should not depend on
undefined behavior for out of range conversions.