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Microsoft KB Archive/39443

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Knowledge Base

FIX: Parentheses Necessary for Operator Precedence

Article ID: 39443

Article Last Modified on 10/29/2003


  • Microsoft Macro Assembler 5.1 Standard Edition

This article was previously published under Q39443


Using Microsoft Macro Assembler (MASM) version 5.1, You may be able to correct "Illegal size for operand" errors by careful use of parentheses.


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


The following code demonstrates warnings, errors, and their solution:

.model small,c

myproc PROC buffer:FAR PTR BYTE

           mov     bx, WORD PTR buffer[0]
           mov     ds, WORD PTR buffer[2]

; MASM gives an operand-size error. This is a precedence problem that
; you can correct with parentheses:

           mov     bx, WORD PTR (buffer[0])
           mov     ds, WORD PTR (buffer[2])

myproc ENDP


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

Keywords: kbfix KB39443