struct isl_set *isl_map_underlying_set(struct isl_map *map);
struct isl_basic_map *isl_basic_map_overlying_set(struct isl_basic_set *bset,
struct isl_basic_map *like);
+__isl_give isl_basic_set *isl_basic_set_drop(__isl_take isl_basic_set *bset,
+ enum isl_dim_type type, unsigned first, unsigned n);
struct isl_basic_map *isl_basic_map_drop(struct isl_basic_map *bmap,
enum isl_dim_type type, unsigned first, unsigned n);
struct isl_set *isl_set_drop(struct isl_set *set,