OP_RD_SP
TYPE_01, OP_RD_SP | OP_RN_SP }, /* mov (to/from sp) */
TYPE_01, OP_RD_SP | OP_RN_SP }, /* add immediate */
TYPE_04, OP_RD_SP }, /* add extended register */
TYPE_04, OP_RD_SP }, /* sub extended register */
rd_sp = i_ptr->special_ops & OP_RD_SP;