+/**
+ * Return the number of entries in a node set.
+ */
+static int node_set_count(node_set *set) {
+ return pset_count(set);
+}
+
+/** computes dst = dst \/ src for node sets */
+static void node_union(node_set *dst, node_set *src)
+{
+ ir_node *entry;
+ node_set_foreach(entry, src)
+ node_add(dst, entry);
+}
+
+/**
+ * Lookup a node in a node set.
+ */
+static ir_node *node_lookup(node_set *set, ir_node *n)
+{
+ return pset_find(set, n, ir_node_hash(n));
+}
+
+
+/* ---------- Functions for Value sets ---------- */
+
+#define value_set_foreach(v, s) for ((v) = set_first(s); (v); (v) = set_next(s))
+
+/**
+ * calculate a hash value for a value represented by a node
+ */
+static unsigned value_hash(ir_node *value) {
+ return ir_node_hash(value);
+}
+
+/**
+ * Compare two value entries.
+ */
+static int value_cmp(const void *elt, const void *key, size_t size)
+{
+ const value_entry *e1 = elt;
+ const value_entry *e2 = key;
+
+ return identities_cmp(e1->value, e2->value);
+}
+
+/** Create a new value set. */
+static value_set *new_value_set(void) {
+ return new_set(value_cmp, 8);
+}
+
+/** Deletes a value set. */
+static void del_value_set(value_set *set) {
+ del_set(set);
+}
+
+/**
+ * Add a node node representing the value value to the set.
+ */
+static value_entry *value_add(value_set *set, ir_node *node, ir_node *value)