+
+/* Plug in "subs" for dimension "type", "pos" in the integer divisions
+ * of "ls".
+ *
+ * Let i be the dimension to replace and let "subs" be of the form
+ *
+ * f/d
+ *
+ * Any integer division with a non-zero coefficient for i,
+ *
+ * floor((a i + g)/m)
+ *
+ * is replaced by
+ *
+ * floor((a f + d g)/(m d))
+ */
+__isl_give isl_local_space *isl_local_space_substitute(
+ __isl_take isl_local_space *ls,
+ enum isl_dim_type type, unsigned pos, __isl_keep isl_aff *subs)
+{
+ int i;
+ isl_int v;
+
+ ls = isl_local_space_cow(ls);
+ if (!ls || !subs)
+ return isl_local_space_free(ls);
+
+ if (!isl_space_is_equal(ls->dim, subs->ls->dim))
+ isl_die(isl_local_space_get_ctx(ls), isl_error_invalid,
+ "spaces don't match", return isl_local_space_free(ls));
+ if (isl_local_space_dim(subs->ls, isl_dim_div) != 0)
+ isl_die(isl_local_space_get_ctx(ls), isl_error_unsupported,
+ "cannot handle divs yet",
+ return isl_local_space_free(ls));
+
+ pos += isl_local_space_offset(ls, type);
+
+ isl_int_init(v);
+ for (i = 0; i < ls->div->n_row; ++i) {
+ if (isl_int_is_zero(ls->div->row[i][1 + pos]))
+ continue;
+ isl_int_set(v, ls->div->row[i][1 + pos]);
+ isl_int_set_si(ls->div->row[i][1 + pos], 0);
+ isl_seq_combine(ls->div->row[i] + 1,
+ subs->v->el[0], ls->div->row[i] + 1,
+ v, subs->v->el + 1, subs->v->size - 1);
+ isl_int_mul(ls->div->row[i][0],
+ ls->div->row[i][0], subs->v->el[0]);
+ normalize_div(ls, i);
+ }
+ isl_int_clear(v);
+
+ return ls;
+}
+
+int isl_local_space_is_named_or_nested(__isl_keep isl_local_space *ls,
+ enum isl_dim_type type)
+{
+ if (!ls)
+ return -1;
+ return isl_space_is_named_or_nested(ls->dim, type);
+}
+
+__isl_give isl_local_space *isl_local_space_drop_dims(
+ __isl_take isl_local_space *ls,
+ enum isl_dim_type type, unsigned first, unsigned n)
+{
+ isl_ctx *ctx;
+
+ if (!ls)
+ return NULL;
+ if (n == 0 && !isl_local_space_is_named_or_nested(ls, type))
+ return ls;
+
+ ctx = isl_local_space_get_ctx(ls);
+ if (first + n > isl_local_space_dim(ls, type))
+ isl_die(ctx, isl_error_invalid, "range out of bounds",
+ return isl_local_space_free(ls));
+
+ ls = isl_local_space_cow(ls);
+ if (!ls)
+ return NULL;
+
+ if (type == isl_dim_div) {
+ ls->div = isl_mat_drop_rows(ls->div, first, n);
+ } else {
+ ls->dim = isl_space_drop_dims(ls->dim, type, first, n);
+ if (!ls->dim)
+ return isl_local_space_free(ls);
+ }
+
+ first += 1 + isl_local_space_offset(ls, type);
+ ls->div = isl_mat_drop_cols(ls->div, first, n);
+ if (!ls->div)
+ return isl_local_space_free(ls);
+
+ return ls;
+}
+
+__isl_give isl_local_space *isl_local_space_insert_dims(
+ __isl_take isl_local_space *ls,
+ enum isl_dim_type type, unsigned first, unsigned n)
+{
+ isl_ctx *ctx;
+
+ if (!ls)
+ return NULL;
+ if (n == 0 && !isl_local_space_is_named_or_nested(ls, type))
+ return ls;
+
+ ctx = isl_local_space_get_ctx(ls);
+ if (first > isl_local_space_dim(ls, type))
+ isl_die(ctx, isl_error_invalid, "position out of bounds",
+ return isl_local_space_free(ls));
+
+ ls = isl_local_space_cow(ls);
+ if (!ls)
+ return NULL;
+
+ if (type == isl_dim_div) {
+ ls->div = isl_mat_insert_zero_rows(ls->div, first, n);
+ } else {
+ ls->dim = isl_space_insert_dims(ls->dim, type, first, n);
+ if (!ls->dim)
+ return isl_local_space_free(ls);
+ }
+
+ first += 1 + isl_local_space_offset(ls, type);
+ ls->div = isl_mat_insert_zero_cols(ls->div, first, n);
+ if (!ls->div)
+ return isl_local_space_free(ls);
+
+ return ls;
+}
+
+/* Check if the constraints pointed to by "constraint" is a div
+ * constraint corresponding to div "div" in "ls".
+ *
+ * That is, if div = floor(f/m), then check if the constraint is
+ *
+ * f - m d >= 0
+ * or
+ * -(f-(m-1)) + m d >= 0
+ */
+int isl_local_space_is_div_constraint(__isl_keep isl_local_space *ls,
+ isl_int *constraint, unsigned div)
+{
+ unsigned pos;
+
+ if (!ls)
+ return -1;
+
+ if (isl_int_is_zero(ls->div->row[div][0]))
+ return 0;
+
+ pos = isl_local_space_offset(ls, isl_dim_div) + div;
+
+ if (isl_int_eq(constraint[pos], ls->div->row[div][0])) {
+ int neg;
+ isl_int_sub(ls->div->row[div][1],
+ ls->div->row[div][1], ls->div->row[div][0]);
+ isl_int_add_ui(ls->div->row[div][1], ls->div->row[div][1], 1);
+ neg = isl_seq_is_neg(constraint, ls->div->row[div]+1, pos);
+ isl_int_sub_ui(ls->div->row[div][1], ls->div->row[div][1], 1);
+ isl_int_add(ls->div->row[div][1],
+ ls->div->row[div][1], ls->div->row[div][0]);
+ if (!neg)
+ return 0;
+ if (isl_seq_first_non_zero(constraint+pos+1,
+ ls->div->n_row-div-1) != -1)
+ return 0;
+ } else if (isl_int_abs_eq(constraint[pos], ls->div->row[div][0])) {
+ if (!isl_seq_eq(constraint, ls->div->row[div]+1, pos))
+ return 0;
+ if (isl_seq_first_non_zero(constraint+pos+1,
+ ls->div->n_row-div-1) != -1)
+ return 0;
+ } else
+ return 0;
+
+ return 1;
+}
+
+/*
+ * Set active[i] to 1 if the dimension at position i is involved
+ * in the linear expression l.
+ */
+int *isl_local_space_get_active(__isl_keep isl_local_space *ls, isl_int *l)
+{
+ int i, j;
+ isl_ctx *ctx;
+ int *active = NULL;
+ unsigned total;
+ unsigned offset;
+
+ ctx = isl_local_space_get_ctx(ls);
+ total = isl_local_space_dim(ls, isl_dim_all);
+ active = isl_calloc_array(ctx, int, total);
+ if (!active)
+ return NULL;
+
+ for (i = 0; i < total; ++i)
+ active[i] = !isl_int_is_zero(l[i]);
+
+ offset = isl_local_space_offset(ls, isl_dim_div) - 1;
+ for (i = ls->div->n_row - 1; i >= 0; --i) {
+ if (!active[offset + i])
+ continue;
+ for (j = 0; j < total; ++j)
+ active[j] |= !isl_int_is_zero(ls->div->row[i][2 + j]);
+ }
+
+ return active;
+}
+
+/* Given a local space "ls" of a set, create a local space
+ * for the lift of the set. In particular, the result
+ * is of the form [dim -> local[..]], with ls->div->n_row variables in the
+ * range of the wrapped map.
+ */
+__isl_give isl_local_space *isl_local_space_lift(
+ __isl_take isl_local_space *ls)
+{
+ ls = isl_local_space_cow(ls);
+ if (!ls)
+ return NULL;
+
+ ls->dim = isl_space_lift(ls->dim, ls->div->n_row);
+ ls->div = isl_mat_drop_rows(ls->div, 0, ls->div->n_row);
+ if (!ls->dim || !ls->div)
+ return isl_local_space_free(ls);
+
+ return ls;
+}
+
+/* Construct a basic map that maps a set living in local space "ls"
+ * to the corresponding lifted local space.
+ */
+__isl_give isl_basic_map *isl_local_space_lifting(
+ __isl_take isl_local_space *ls)
+{
+ isl_basic_map *lifting;
+ isl_basic_set *bset;
+
+ if (!ls)
+ return NULL;
+ if (!isl_local_space_is_set(ls))
+ isl_die(isl_local_space_get_ctx(ls), isl_error_invalid,
+ "lifting only defined on set spaces",
+ return isl_local_space_free(ls));
+
+ bset = isl_basic_set_from_local_space(ls);
+ lifting = isl_basic_set_unwrap(isl_basic_set_lift(bset));
+ lifting = isl_basic_map_domain_map(lifting);
+ lifting = isl_basic_map_reverse(lifting);
+
+ return lifting;
+}