The LABEL directive defines the following attributes of Name:

• Segment: current segment being assembled
  
• Offset: current position within this segment
  
• Type: the operand of the LABEL directive

Syntax

Name LABEL Type-Declaration  or
Name:
  or
Name::

The LABEL directive provides a method of labeling a memory location and assigning it a type without allocating any storage. It can be used to create multiple labels of differing types that are aliases for the same memory location.

The Name entry is an Identifier that is converted to a LabelName according to the value given by Type-Declaration. See the section on label names for more information on the details of this conversion.

The : and :: forms of this directive are used for defining code labels. In this case, the Name entry is converted to a Target-LabelName. The double-colon form of the directive is used when the Name must be visible outside of the procedure block in which it is defined.

To refer to a data area but use a length different from the original definition of that area:

BARRAY  LABEL    BYTE
ARRAY   DW       100 DUP(0)
           .
           .
           .
        ADD      AL,BARRAY[99]   ;ADD 100th BYTE  TO AL
        ADD      AX,ARRAY[98]    ;ADD 50th WORD  TO AX

To define multiple entry points within a procedure:

SUBRT   PROC    FAR
        .
        .
        .
SUB2    LABEL   FAR   ;Should have same attribute as containing PROC
        .
        .
        .
        RET
SUBRT   ENDP