https://gcc.gnu.org/bugzilla/show_bug.cgi?id=106117
--- Comment #5 from joseph at codesourcery dot com <joseph at codesourcery dot com> --- The idea with "16" is to say that's the exact FLT_EVAL_METHOD value (defined in C23 Annex H) whose semantics should be followed. It would affect float/double promotion on i386 as well (the back end gives an error that the combination of that option with -mfpmath=387 is unsupported).
