.ERRIDN/.ERRIDNI (Error if Arguments are Identical)

The .ERRIDN and .ERRIDNI directives generate an assembly error if the two Text-Arguments are identical.

Syntax

.ERRIDN Text-Argument-1, Text-Argument-2
   or
.ERRIDNI Text-Argument-1, Text-Argument-2

Remarks

The .ERRIDN directive performs a case-sensitive comparision, and the .ERRIDNI directive performs a case-insensitive comparision.

Example

In this example, .ERRIDN protects against the passing the AX register as the second parameter, because the macro does not work if this happens. This example uses the .ERRIDNI directive since the macro needs to check for all possible spellings of the AX register.

ADDEM  MACRO AD1,AD2,SUM
       .ERRIDNI <ax>,<AD2> ;; ERROR IF AD2 is ax
       MOV      AX,AD1     ;; Would overwrite if AD2 were AX
       ADD      AX,AD2
       MOV      SUM,AX     ;; SUM must be register or memory
ENDM

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