https://gcc.gnu.org/bugzilla/show_bug.cgi?id=102572
--- Comment #2 from Andrew Pinski <pinskia at gcc dot gnu.org> --- if (!useless_type_conversion_p (masktype, TREE_TYPE (vec_mask))) { poly_uint64 sub1 = TYPE_VECTOR_SUBPARTS (TREE_TYPE (mask_op)); poly_uint64 sub2 = TYPE_VECTOR_SUBPARTS (masktype); gcc_assert (known_eq (sub1, sub2));