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Q68873: FIX: Warning A4057 When Using Local Variables

Article: Q68873
Product(s): Microsoft Macro Assembler
Version(s): 5.1
Operating System(s): 
Keyword(s): 
Last Modified: 04-MAY-2001

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The information in this article applies to:

- Microsoft Macro Assembler (MASM), version 5.1 
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SYMPTOMS
========

If the code below assembled with Microsoft Macro Assembler (MASM) version 5.1,
it produces the following error:

  Warning A4057: illegal size for operand

This warning is falsely generated and does not occur with MASM version 5.1a.

The variable arg1, shown in the code below, is a local variable that is defined
as a double word. The warning occurs when arg1 is used as a WORD PTR. This is
acceptable and should not be flagged.

STATUS
======

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

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

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

  ; Assemble options needed: none

  .MODEL small,c

  .CODE

  Begin PROC arg1:DWORD
      mov ax, WORD PTR arg1
      ret
  Begin ENDP

  END

Additional query words: 5.10 buglist5.10 fixlist5.10a

======================================================================
Keywords          :  
Technology        : kbMASMsearch kbAudDeveloper kbMASM510
Version           : :5.1
Solution Type     : kbfix

=============================================================================

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