Article: Q39517
Version(s): 5.00 5.10 | 5.10
Operating System: MS-DOS    | OS/2
Flags: ENDUSER | eq if directive ifidn arguments
Last Modified: 12-JAN-1989

When using IF directives, relational operators could be used to form
the conditions. Note: The relational operators treat the expressions
as follows:

   EQ and NE treat their operators as 16-bit numbers

   LT, LE, GT, and GE treat their operators as 17-bit numbers.

The relational operators cannot be used for comparing string
arguments. It is often necessary to compare string arguments in
MACROs. IFIDN and IFDIF directives are available for this purpose.
IFIDN grants assembly if two arguments are identical; IFDIF grants
assembly if two arguments are different. The syntax is as follows:

    IFIDN <argument1>,<argument2>
    IFDIF <argument1>,<argument2>

Please refer to "Microsoft Macro Assembler Programmer's Guide" in the
section "Assembling Conditionally" for more specific information.