/* predecessors of a block are control flow nodes */
for (i = _get_walk_arity(env, node) - 1; i >= 0; --i) {
ir_node *pred = _get_walk_irn_n(env, node, i);
/* predecessors of a block are control flow nodes */
for (i = _get_walk_arity(env, node) - 1; i >= 0; --i) {
ir_node *pred = _get_walk_irn_n(env, node, i);