for (int i=0; i < in_bb->num_pred_seq_points; i++) {
if (!g_hash_table_lookup (seen, in_bb->pred_seq_points [i])) {
g_array_append_val (predecessors, in_bb->pred_seq_points [i]);
for (int i=0; i < in_bb->num_pred_seq_points; i++) {
if (!g_hash_table_lookup (seen, in_bb->pred_seq_points [i])) {
g_array_append_val (predecessors, in_bb->pred_seq_points [i]);