+void firm_clear_block_phis(ir_node *node, void *env)
+{
+ (void) env;
+ if (is_Block(node))
+ set_Block_phis(node, NULL);
+}
+
+void firm_collect_block_phis(ir_node *node, void *env)
+{
+ (void) env;
+ if (is_Phi(node))
+ add_Block_phi(get_nodes_block(node), node);
+}
+