def _ADD_shifted_register(cpu, res_op, reg_op1, reg_op2):
    """
        ADD (shifted register).

        :param res_op: destination register.
        :param reg_op1: source register.
        :param reg_op2: source register.
        """
    cpu._adds_subs_shifted_register(res_op, reg_op1, reg_op2, mnem='add')
