https://gcc.gnu.org/bugzilla/show_bug.cgi?id=84340
--- Comment #14 from Paolo Bonzini <bonzini at gnu dot org> --- I'll just revert the original PR84307 patch. Changing the fnspec has way too many ramifications. PR84307 can either be fixed with an early UNPOISON elimination pass, or delayed to GCC 9 where we can play with pass reordering.
