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From: terra AT diku DOT dk (Morten Welinder)
Newsgroups: comp.os.msdos.djgpp
Subject: Re: Bugs in 386 GAS?
Date: 29 Jun 1995 12:25:45 GMT
Organization: Department of Computer Science, U of Copenhagen
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Sender: terra AT tyr DOT diku DOT dk
References: <1995Jun28 DOT 204906 DOT 54920 AT cc DOT usu DOT edu>
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To: djgpp AT sun DOT soe DOT clarkson DOT edu
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sl18g AT cc DOT usu DOT edu writes:

>was right.  I assembled the following code in gas 2.5.2:

>original		after disassembly
>add %cl,%ch		add %cl,%ch	[fine]
>add %ch,%cl		add %ebp,%ecx	[?!?]
>add %bl,%al		add %ebx,%eax   [?!?]
>add %al,%bl		add %al,%bl	[fine]
>mov $5,%al		mov $5,%eax	[?!?]
>mov $5,%ah		mov $5,%ah	[fine]
>mov %al,%ah		mov %al,%ah	[fine]
>mov %ah,%al		mov %esp,%eax	[?!?]
>mov %ax,%bx		mov %ax,%bx	[fine]
>mov %bx,%ax		mov %ebx,%eax	[?!?]


Yep, gas is buggy.  Always use an explicit size suffix like in "addb",
"subl", or "movw".

This has recently been added to the FAQ.

Morten