#define get_reg(irn) arch_get_irn_register(get_chordal_arch(chordal_env), irn)
#define set_reg(irn, reg) arch_set_irn_register(get_chordal_arch(chordal_env), irn, reg)
-#define is_Perm(irn) (arch_irn_classify(arch_env, irn) == arch_irn_class_perm)
+#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)