https://gcc.gnu.org/bugzilla/show_bug.cgi?id=99048
Segher Boessenkool <segher at gcc dot gnu.org> changed: What |Removed |Added ---------------------------------------------------------------------------- CC| |segher at gcc dot gnu.org --- Comment #1 from Segher Boessenkool <segher at gcc dot gnu.org> --- IBM long double ("double-double") is not an IEEE floating point format, so all these rules do not apply, but you are right it is surprising.