https://gcc.gnu.org/bugzilla/show_bug.cgi?id=121764
--- Comment #3 from Andrew Pinski <pinskia at gcc dot gnu.org> --- (In reply to Andrew Pinski from comment #0) > constant_pointer_difference has: > /* For pointers p2 and p1 return p2 - p1 if the > difference is known and constant, otherwise return NULL. */ > > While ptr_difference_const does: > /* Returns true if addresses of E1 and E2 differ by a constant, false > otherwise. If they do, E1 - E2 is stored in *DIFF. */ > > > I suspect we could change the constant_pointer_difference usage to > ptr_difference_const one. Let me try that. So it is a little more complex due to constant_pointer_difference using more walks. Because in the case of ptr_difference_const we already have the pointer_plus case handled in match. While in the case of constant_pointer_difference we don't so we need to walk to gat that. Something for next year to merge both.
