+ir_node *(sched_add_before)(ir_node *before, ir_node *irn);
+ir_node *(sched_add_after)(ir_node *before, ir_node *irn);
+void (sched_remove)(ir_node *irn);
+
+#define sched_is_end(irn) is_Block(irn)
+#define sched_is_begin(irn) is_Block(irn)
+
+#define sched_foreach_from(from, irn) \
+ for(irn = from; !sched_is_end(irn); irn = sched_next(irn))
+
+#define sched_foreach_reverse_from(from, irn) \
+ for(irn = from; !sched_is_begin(irn); irn = sched_prev(irn))