+ if (is_Block(from))
+ from = forward ? sched_next(from) : sched_prev(from);
+
+ for(curr = from; curr != bl && predicator(curr, data); curr = forward ? sched_next(curr) : sched_prev(curr));
+
+ return curr;
+}
+
+/** A simple forward single linked list. */
+typedef struct {
+ ir_node *start; /**< start of the list */
+ ir_node *end; /**< last block in the list */
+ unsigned n_blks; /**< number of blocks in the list */
+} anchor;
+
+/**
+ * Ext-Block walker: create a block schedule
+ */
+static void create_block_list(ir_extblk *blk, void *env) {
+ anchor *list = env;
+ int i, n;
+
+ for (i = 0, n = get_extbb_n_blocks(blk); i < n; ++i) {
+ ir_node *block = get_extbb_block(blk, i);
+
+ set_irn_link(block, NULL);
+ if (list->start)
+ set_irn_link(list->end, block);
+ else
+ list->start = block;
+
+ list->end = block;
+ ++list->n_blks;
+ }
+}
+
+/*
+ * Calculates a block schedule. The schedule is stored as a linked
+ * list starting at the start_block of the irg.
+ */
+ir_node **sched_create_block_schedule(ir_graph *irg)
+{
+ anchor list;
+ ir_node **blk_list, *b, *n;
+ unsigned i;
+
+ /* schedule extended basic blocks */
+ compute_extbb(irg);
+
+ list.start = NULL;
+ list.end = NULL;
+ list.n_blks = 0;
+ irg_extblock_walk_graph(irg, NULL, create_block_list, &list);
+
+ /** create an array, so we can go forward and backward */
+ blk_list = NEW_ARR_D(ir_node *, irg->obst,list.n_blks);
+
+ for (i = 0, b = list.start; b; b = n, ++i) {
+ n = get_irn_link(b);
+ set_irn_link(b, INT_TO_PTR(i));
+
+ blk_list[i] = b;
+ }
+ return blk_list;