Q35882: FIX: A5114: Operand Size Does Not Match Segment Word Size

Article: Q35882
Product(s): Microsoft Macro Assembler
Version(s): 5.0,5.1,5.1a
Operating System(s): 
Keyword(s): 
Last Modified: 06-MAY-2001

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The information in this article applies to:

- Microsoft Macro Assembler (MASM), versions 5.0, 5.1, 5.1a 
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SYMPTOMS
========

The Microsoft Macro Assembler (MASM) versions 5.0, 5.1, and 5.1a may generate
the warning:

  A5114: Operand size does not match segment word size

when using 32-bit operands in USE16 segments. The warning is only generated on
push and pop instructions using an operand with the size other than the size of
the segment. For example, using DWORD push in a USE16 segment or using a WORD
push in a USE32 segment. The warning is not generated for any other use of
32-bit operands.

CAUSE
=====

The warning message may have been added to aid the programmer trying to convert
code from 16-bit segments to 32-bit segments. The warning message should only
occur in 32-bit segments when 16-bit push/pop operands are given, and not in the
converse situation.

STATUS
======

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

MORE INFORMATION
================

Sample Code
-----------

  ; Assemble options needed: /W2

  .386

  _TEXT16 SEGMENT WORD PUBLIC USE16 'CODE'
  ASSUME cs:_TEXT16

  start:
      push eax
      pop eax
      mov ax, 4C00h
      int 21h
  _TEXT16 ENDS

  _TEXT32 SEGMENT WORD PUBLIC USE32 'CODE'
  ASSUME cs:_TEXT32
      push ax
      pop ax
      mov ax, 4C00h
      int 21h
  _TEXT32 ENDS

  END start

Additional query words: 5.00 5.10 5.10a

======================================================================
Keywords          :  
Technology        : kbMASMsearch kbAudDeveloper kbMASM510 kbMASM500 kbMASM510a
Version           : :5.0,5.1,5.1a
Solution Type     : kbfix

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