https://gcc.gnu.org/bugzilla/show_bug.cgi?id=113679
--- Comment #9 from Jakub Jelinek <jakub at gcc dot gnu.org> --- That is not what I read from what you've posted, -fexcess-precision=standard is consistent between the compilers, -fexcess-precision=fast is not (and doesn't have to be), neither between different compilers, nor between different optimization levels etc.