int main(int argc, char **argv) { struct isl_ctx *ctx = isl_ctx_alloc(); struct isl_basic_set *bset; struct isl_vec *sample; isl_printer *p; bset = isl_basic_set_read_from_file(ctx, stdin); sample = isl_basic_set_sample_vec(isl_basic_set_copy(bset)); p = isl_printer_to_file(ctx, stdout); p = isl_printer_print_vec(p, sample); p = isl_printer_end_line(p); isl_printer_free(p); assert(sample); if (sample->size > 0) assert(isl_basic_set_contains(bset, sample)); isl_basic_set_free(bset); isl_vec_free(sample); isl_ctx_free(ctx); return 0; }
/* Look for all equalities satisfied by the integer points in bset, * which is assumed to be bounded. * * The equalities are obtained by successively looking for * a point that is affinely independent of the points found so far. * In particular, for each equality satisfied by the points so far, * we check if there is any point on a hyperplane parallel to the * corresponding hyperplane shifted by at least one (in either direction). */ static struct isl_basic_set *uset_affine_hull_bounded(struct isl_basic_set *bset) { struct isl_vec *sample = NULL; struct isl_basic_set *hull; struct isl_tab *tab = NULL; unsigned dim; if (isl_basic_set_plain_is_empty(bset)) return bset; dim = isl_basic_set_n_dim(bset); if (bset->sample && bset->sample->size == 1 + dim) { int contains = isl_basic_set_contains(bset, bset->sample); if (contains < 0) goto error; if (contains) { if (dim == 0) return bset; sample = isl_vec_copy(bset->sample); } else { isl_vec_free(bset->sample); bset->sample = NULL; } } tab = isl_tab_from_basic_set(bset); if (!tab) goto error; if (tab->empty) { isl_tab_free(tab); isl_vec_free(sample); return isl_basic_set_set_to_empty(bset); } if (isl_tab_track_bset(tab, isl_basic_set_copy(bset)) < 0) goto error; if (!sample) { struct isl_tab_undo *snap; snap = isl_tab_snap(tab); sample = isl_tab_sample(tab); if (isl_tab_rollback(tab, snap) < 0) goto error; isl_vec_free(tab->bmap->sample); tab->bmap->sample = isl_vec_copy(sample); } if (!sample) goto error; if (sample->size == 0) { isl_tab_free(tab); isl_vec_free(sample); return isl_basic_set_set_to_empty(bset); } hull = isl_basic_set_from_vec(sample); isl_basic_set_free(bset); hull = extend_affine_hull(tab, hull); isl_tab_free(tab); return hull; error: isl_vec_free(sample); isl_tab_free(tab); isl_basic_set_free(bset); return NULL; }