-#define is_Perm(irn) (arch_irn_class_is(arch_env, irn, perm))
-#define get_reg_cls(irn) (arch_get_irn_reg_class(arch_env, irn, -1))
-#define is_curr_reg_class(irn) (get_reg_cls(p) == chordal_env->cls)
-
-static void clear_link(ir_node *irn, void *data) {