FIX: LES Instruction Assembles Incorrectly (29735)
The information in this article applies to:
- Microsoft Macro Assembler (MASM) 5.1
- Microsoft Macro Assembler (MASM) 5.1a
This article was previously published under Q29735 SYMPTOMS
The program example below demonstrates a problem with the LES instructions
in Microsoft Macro Assembler (MASM) versions 5.1 and 5.1a. The first LES
instruction (Parm1) assembles correctly, but the second instruction (Parm2)
generates the error message:
error A2056: Immediate mode illegal
The only difference between the two instructions is the order of the
arguments. In earlier versions of MASM, they produced identical code.
CAUSE
The problem is with the type operator and the way it handles registers
inside brackets ([]). The type operator makes things a constant on the left
of the expression.
Parm1 works because it handles registers inside brackets differently. "TYPE
x" turns bp into a constant; +10 then turns it back into an addressing
mode.
However, in Parm2, bp+10 has been turned into an addressing mode, which is
then turned into a constant by "TYPE x". This difference is demonstrated in
the sample code below.
STATUS
Microsoft has confirmed this to be a problem in MASM versions 5.1 and 5.1a.
This problem was corrected in MASM version 6.0.
Modification Type: | Major | Last Reviewed: | 10/20/2003 |
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Keywords: | kbfix KB29735 |
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