https://gcc.gnu.org/bugzilla/show_bug.cgi?id=54272
--- Comment #8 from Oleg Endo <olegendo at gcc dot gnu.org> --- Recently some __builtin_*_overflow functions have been added, of which some could utilize the addv and subv instructions. See also https://gcc.gnu.org/onlinedocs/gcc/Integer-Overflow-Builtins.html
