+ * @param n a node representing the value
+ * @param confirm if n is confirmed to be != 0, returns
+ * the the Confirm-node, else NULL
+ */
+int value_not_zero(const ir_node *n, ir_node_cnst_ptr *confirm);
+
+/**
+ * Check, if the value of a node cannot represent a NULL pointer.
+ *
+ * - If option sel_based_null_check_elim is enabled, all
+ * Sel nodes can be skipped.
+ * - A SymConst(entity) is NEVER a NULL pointer
+ * - A Const != NULL is NEVER a NULL pointer
+ * - Confirms are evaluated
+ *
+ * @param n a node representing the value
+ * @param confirm if n is confirmed to be != NULL, returns
+ * the the Confirm-node, else NULL
+ */
+int value_not_null(const ir_node *n, ir_node_cnst_ptr *confirm);
+
+/**
+ * Possible return values of value_classify().