+ case iro_Phi:
+ /* check for non-strict Phi nodes */
+ for (i = arity - 1; i >= 0; --i) {
+ ir_node *pred = get_Phi_pred(node, i);
+ if (is_Unknown(pred)) {
+ /* found an Unknown predecessor, graph is not strict */
+ graph->is_strict = 0;
+ break;
+ }
+ }