int (sched_get_time_step)(const ir_node *irn);
int (sched_has_succ)(const ir_node *irn);
int (sched_has_prev)(const ir_node *irn);
-const ir_node *(sched_succ)(const ir_node *irn);
-const ir_node *(sched_prev)(const ir_node *irn);
-const ir_node *(sched_first)(const ir_node *block);
-const ir_node *(sched_last)(const ir_node *block);
-const ir_node *(sched_add)(ir_node *block, const ir_node *irn);
+ir_node *(sched_succ)(const ir_node *irn);
+ir_node *(sched_prev)(const ir_node *irn);
+ir_node *(sched_first)(const ir_node *block);
+ir_node *(sched_last)(const ir_node *block);
+ir_node *(sched_add)(ir_node *block, const ir_node *irn);
/**
* A shorthand macro for iterating over a schedule.