FIX: .IF with Multiple Tests Adds a JMP Instruction (120067)

The information in this article applies to:

Microsoft Macro Assembler (MASM) 6.1

This article was previously published under Q120067

SYMPTOMS

If two or more values known at assembly time evaluate as TRUE, .IF (below) will add a JMP instruction. In this first example, only the NOP is assembled:

   .IF 1
      nop
   .ENDIF

In this second example, a JMP instruction is added:

   .IF 1 || 3
      nop
   .ENDIF

If you use a register, as in this third example, the result is a conditional JMP to the location following the .IF:

   .IF ax || 3
      nop
   .ENDIF

The code runs as expected, despite the extra instructions.

RESOLUTION

To eliminate the extra generated code, replace the "||" with an "OR".

STATUS

Microsoft has confirmed this to be a bug in MASM version 6.1. This problem was corrected in MASM version 6.11.

Modification Type:	Minor	Last Reviewed:	2/11/2004
Keywords:	kbfix KB120067