Microsoft KB Archive/26270

= FIX: Relational Operators with MOV May Evaluate Incorrectly =

Article ID: 26270

Article Last Modified on 10/17/2003

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APPLIES TO


 * Microsoft Macro Assembler 5.0
 * Microsoft Macro Assembler 5.1 Standard Edition
 * Microsoft Macro Assembler 5.1a

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This article was previously published under Q26270



SYMPTOMS
In the Microsoft Macro Assembler (MASM) versions 5.0, 5.1, and 5.1a, some of the relational operators evaluate to the wrong value when used with a MOV instruction.



STATUS
Microsoft has confirmed this to be a problem in MASM versions 5.0, 5.1, and 5.1a. This problem was corrected in MASM version 6.0.



MORE INFORMATION
The following listing-file sections are examples of this problem. It is important to note that FFFF=true, and 0000=false. It is also important to note that when FFFFh is used with the GT, GE, LE, and LT operators, it is interpreted as the largest positive number, not as -1.

Sample Listing File
1                               .MODEL SMALL 2                               .CODE 3 0000 B8 0000                  MOV AX, 0FFFFH GT -1 4 0003 B8 FFFF                  MOV AX, 0FFFFH LE -1 5                               END

1                               .386 2                                .MODEL SMALL 3                               .CODE 4 0000 66| B8 FFFF              MOV AX, -1  GE  0FFFFFFFFH 5 0004 66| B8 FFFF              MOV AX, 0FFFFFFFFH  LE  -1 6 0008 66| B8 0000              MOV AX, 0FFFFFFFFH  GT  -1 7 000C 66| B8 0000              MOV AX, -1  LT  0FFFFFFFFH 8                               END

Additional query words: 5.00 5.10 5.10a 6.00 buglist5.00 buglist5.10 buglist5.10a fixlist6.00

Keywords: kbfix KB26270

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