/*
- * Copyright 2010 INRIA Saclay
+ * Copyright 2010-2011 INRIA Saclay
*
* Use of this software is governed by the GNU LGPLv2.1 license
*
uint32_t hash;
struct isl_hash_table_entry *entry;
- if (isl_map_fast_is_empty(map)) {
+ if (isl_map_plain_is_empty(map)) {
isl_map_free(map);
return umap;
}
return NULL;
}
+static int universe_entry(void **entry, void *user)
+{
+ isl_map *map = *entry;
+ isl_union_map **res = user;
+
+ map = isl_map_universe(isl_map_get_dim(map));
+ *res = isl_union_map_add_map(*res, map);
+
+ return 0;
+}
+
+__isl_give isl_union_map *isl_union_map_universe(__isl_take isl_union_map *umap)
+{
+ return cond_un_op(umap, &universe_entry);
+}
+
+__isl_give isl_union_set *isl_union_set_universe(__isl_take isl_union_set *uset)
+{
+ return isl_union_map_universe(uset);
+}
+
static int reverse_entry(void **entry, void *user)
{
isl_map *map = *entry;
*sample = isl_map_sample(isl_map_copy(map));
if (!*sample)
return -1;
- if (!isl_basic_map_fast_is_empty(*sample))
+ if (!isl_basic_map_plain_is_empty(*sample))
return -1;
return 0;
}
return data.res;
}
+struct isl_forall_user_data {
+ int res;
+ int (*fn)(__isl_keep isl_map *map, void *user);
+ void *user;
+};
+
+static int forall_user_entry(void **entry, void *user)
+{
+ struct isl_forall_user_data *data = user;
+ isl_map *map = *entry;
+
+ data->res = data->fn(map, data->user);
+ if (data->res < 0)
+ return -1;
+
+ if (!data->res)
+ return -1;
+
+ return 0;
+}
+
+/* Check if fn(map, user) returns true for all maps "map" in umap.
+ */
+static int union_map_forall_user(__isl_keep isl_union_map *umap,
+ int (*fn)(__isl_keep isl_map *map, void *user), void *user)
+{
+ struct isl_forall_user_data data = { 1, fn, user };
+
+ if (!umap)
+ return -1;
+
+ if (isl_hash_table_foreach(umap->dim->ctx, &umap->table,
+ &forall_user_entry, &data) < 0 && data.res)
+ return -1;
+
+ return data.res;
+}
+
int isl_union_map_is_empty(__isl_keep isl_union_map *umap)
{
return union_map_forall(umap, &isl_map_is_empty);
return sv;
}
+int isl_union_map_is_injective(__isl_keep isl_union_map *umap)
+{
+ int in;
+
+ umap = isl_union_map_copy(umap);
+ umap = isl_union_map_reverse(umap);
+ in = isl_union_map_is_single_valued(umap);
+ isl_union_map_free(umap);
+
+ return in;
+}
+
+/* Represents a map that has a fixed value (v) for one of its
+ * range dimensions.
+ * The map in this structure is not reference counted, so it
+ * is only valid while the isl_union_map from which it was
+ * obtained is still alive.
+ */
+struct isl_fixed_map {
+ isl_int v;
+ isl_map *map;
+};
+
+static struct isl_fixed_map *alloc_isl_fixed_map_array(isl_ctx *ctx,
+ int n)
+{
+ int i;
+ struct isl_fixed_map *v;
+
+ v = isl_calloc_array(ctx, struct isl_fixed_map, n);
+ if (!v)
+ return NULL;
+ for (i = 0; i < n; ++i)
+ isl_int_init(v[i].v);
+ return v;
+}
+
+static void free_isl_fixed_map_array(struct isl_fixed_map *v, int n)
+{
+ int i;
+
+ if (!v)
+ return;
+ for (i = 0; i < n; ++i)
+ isl_int_clear(v[i].v);
+ free(v);
+}
+
+/* Compare the "v" field of two isl_fixed_map structs.
+ */
+static int qsort_fixed_map_cmp(const void *p1, const void *p2)
+{
+ const struct isl_fixed_map *e1 = (const struct isl_fixed_map *) p1;
+ const struct isl_fixed_map *e2 = (const struct isl_fixed_map *) p2;
+
+ return isl_int_cmp(e1->v, e2->v);
+}
+
+/* Internal data structure used while checking whether all maps
+ * in a union_map have a fixed value for a given output dimension.
+ * v is the list of maps, with the fixed value for the dimension
+ * n is the number of maps considered so far
+ * pos is the output dimension under investigation
+ */
+struct isl_fixed_dim_data {
+ struct isl_fixed_map *v;
+ int n;
+ int pos;
+};
+
+static int fixed_at_pos(__isl_keep isl_map *map, void *user)
+{
+ struct isl_fixed_dim_data *data = user;
+
+ data->v[data->n].map = map;
+ return isl_map_plain_is_fixed(map, isl_dim_out, data->pos,
+ &data->v[data->n++].v);
+}
+
+static int plain_injective_on_range(__isl_take isl_union_map *umap,
+ int first, int n_range);
+
+/* Given a list of the maps, with their fixed values at output dimension "pos",
+ * check whether the ranges of the maps form an obvious partition.
+ *
+ * We first sort the maps according to their fixed values.
+ * If all maps have a different value, then we know the ranges form
+ * a partition.
+ * Otherwise, we collect the maps with the same fixed value and
+ * check whether each such collection is obviously injective
+ * based on later dimensions.
+ */
+static int separates(struct isl_fixed_map *v, int n,
+ __isl_take isl_dim *dim, int pos, int n_range)
+{
+ int i;
+
+ if (!v)
+ goto error;
+
+ qsort(v, n, sizeof(*v), &qsort_fixed_map_cmp);
+
+ for (i = 0; i + 1 < n; ++i) {
+ int j, k;
+ isl_union_map *part;
+ int injective;
+
+ for (j = i + 1; j < n; ++j)
+ if (isl_int_ne(v[i].v, v[j].v))
+ break;
+
+ if (j == i + 1)
+ continue;
+
+ part = isl_union_map_alloc(isl_dim_copy(dim), j - i);
+ for (k = i; k < j; ++k)
+ part = isl_union_map_add_map(part,
+ isl_map_copy(v[k].map));
+
+ injective = plain_injective_on_range(part, pos + 1, n_range);
+ if (injective < 0)
+ goto error;
+ if (!injective)
+ break;
+
+ i = j - 1;
+ }
+
+ isl_dim_free(dim);
+ free_isl_fixed_map_array(v, n);
+ return i + 1 >= n;
+error:
+ isl_dim_free(dim);
+ free_isl_fixed_map_array(v, n);
+ return -1;
+}
+
+/* Check whether the maps in umap have obviously distinct ranges.
+ * In particular, check for an output dimension in the range
+ * [first,n_range) for which all maps have a fixed value
+ * and then check if these values, possibly along with fixed values
+ * at later dimensions, entail distinct ranges.
+ */
+static int plain_injective_on_range(__isl_take isl_union_map *umap,
+ int first, int n_range)
+{
+ isl_ctx *ctx;
+ int n;
+ struct isl_fixed_dim_data data = { NULL };
+
+ ctx = isl_union_map_get_ctx(umap);
+
+ if (!umap)
+ goto error;
+
+ n = isl_union_map_n_map(umap);
+ if (n <= 1) {
+ isl_union_map_free(umap);
+ return 1;
+ }
+
+ if (first >= n_range) {
+ isl_union_map_free(umap);
+ return 0;
+ }
+
+ data.v = alloc_isl_fixed_map_array(ctx, n);
+ if (!data.v)
+ goto error;
+
+ for (data.pos = first; data.pos < n_range; ++data.pos) {
+ int fixed;
+ int injective;
+ isl_dim *dim;
+
+ data.n = 0;
+ fixed = union_map_forall_user(umap, &fixed_at_pos, &data);
+ if (fixed < 0)
+ goto error;
+ if (!fixed)
+ continue;
+ dim = isl_union_map_get_dim(umap);
+ injective = separates(data.v, n, dim, data.pos, n_range);
+ isl_union_map_free(umap);
+ return injective;
+ }
+
+ free_isl_fixed_map_array(data.v, n);
+ isl_union_map_free(umap);
+
+ return 0;
+error:
+ free_isl_fixed_map_array(data.v, n);
+ isl_union_map_free(umap);
+ return -1;
+}
+
+/* Check whether the maps in umap that map to subsets of "ran"
+ * have obviously distinct ranges.
+ */
+static int plain_injective_on_range_wrap(__isl_keep isl_set *ran, void *user)
+{
+ isl_union_map *umap = user;
+
+ umap = isl_union_map_copy(umap);
+ umap = isl_union_map_intersect_range(umap,
+ isl_union_set_from_set(isl_set_copy(ran)));
+ return plain_injective_on_range(umap, 0, isl_set_dim(ran, isl_dim_set));
+}
+
+/* Check if the given union_map is obviously injective.
+ *
+ * In particular, we first check if all individual maps are obviously
+ * injective and then check if all the ranges of these maps are
+ * obviously disjoint.
+ */
+int isl_union_map_plain_is_injective(__isl_keep isl_union_map *umap)
+{
+ int in;
+ isl_union_map *univ;
+ isl_union_set *ran;
+
+ in = union_map_forall(umap, &isl_map_plain_is_injective);
+ if (in < 0)
+ return -1;
+ if (!in)
+ return 0;
+
+ univ = isl_union_map_universe(isl_union_map_copy(umap));
+ ran = isl_union_map_range(univ);
+
+ in = union_map_forall_user(ran, &plain_injective_on_range_wrap, umap);
+
+ isl_union_set_free(ran);
+
+ return in;
+}
+
int isl_union_map_is_bijective(__isl_keep isl_union_map *umap)
{
int sv;
if (sv < 0 || !sv)
return sv;
- umap = isl_union_map_copy(umap);
- umap = isl_union_map_reverse(umap);
- sv = isl_union_map_is_single_valued(umap);
- isl_union_map_free(umap);
-
- return sv;
+ return isl_union_map_is_injective(umap);
}
static int zip_entry(void **entry, void *user)
__isl_give isl_union_set *isl_union_set_solutions(
__isl_take isl_union_set *uset)
{
- isl_ctx *ctx;
- isl_dim *dim;
isl_union_set *res = NULL;
if (!uset)
projects / platform / upstream / isl.git / blobdiff