+/** State of loop nesting depth. */
+typedef enum {
+ loop_nesting_depth_none, /**< Loop nesting depths are not computed, no memory is
+ allocated, access fails. */
+ loop_nesting_depth_consistent, /**< Loop nesting depth information is computed and correct. */
+ loop_nesting_depth_inconsistent /**< Loop nesting depth is computed but the graphs have been
+ changed since. */
+} loop_nesting_depth_state;
+
+loop_nesting_depth_state get_irp_loop_nesting_depth_state(void);
+void set_irp_loop_nesting_depth_state(loop_nesting_depth_state s);
+void set_irp_loop_nesting_depth_state_inconsistent(void);
+