[Bug rtl-optimization/82692] [8 Regression] Ordered comparisons used for unordered built-ins

[segher at gcc dot gnu.org]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=82692

--- Comment #8 from Segher Boessenkool <segher at gcc dot gnu.org> ---
Maybe you can handle this in can_change_dest_mode?  That will catch
the similar cases, too.