https://gcc.gnu.org/bugzilla/show_bug.cgi?id=109269
Andrew Pinski <pinskia at gcc dot gnu.org> changed: What |Removed |Added ---------------------------------------------------------------------------- Resolution|--- |INVALID Status|UNCONFIRMED |RESOLVED --- Comment #2 from Andrew Pinski <pinskia at gcc dot gnu.org> --- Pointers cannot wrap that is once a pointer is a valid pointer, adding anything to it cannot get you a null pointer. In this case a large argument to num would cause an for the pointers so gcc knows num has to be less than LONG_LONG_MAX/sizeof(int).