+ freqs = ef->set = new_set(cmp_freq, dfs_get_n_nodes(dfs));
+
+ /*
+ * Populate the exec freq set.
+ * The DFS cannot be used alone, since the CFG might not be connected
+ * due to unreachable code.
+ */
+ irg_block_walk_graph(irg, collect_blocks, NULL, freqs);