From mboxrd@z Thu Jan  1 00:00:00 1970
From: hjl@nynexst.com (H.J. Lu)
To: dj@stealth.ctron.com (DJ Delorie)
Cc: gas2@cygnus.com, masaki@eie.minolta.co.jp, raeburn@cygnus.com (Ken Raeburn), ian@cygnus.com (Ian Lance Taylor)
Subject: Re: [masaki@eie.monolta.co.jp: GAS bug and etc]
Date: Fri, 11 Nov 1994 07:06:00 -0000
Message-id: <9411111506.AA05546@titanic.nynexst.com>
References: <9411111450.AA12152@delorie>
X-SW-Source: 1994/msg00187.html

> 
> > I think gas will add a right address prefix automatically when it sees
> > a large offset. Ken?
> 
> The problem with using the 16-bit jcxz is that, even if the offset is
> small, if the target isn't in the first 64K of memory, the program is

How big is your offset? I need to know the exact number. FYI,
jcxz/jecxz can only take a signed byte disp. But gas treats the
disp as unsigned byte.

> toast.  The reason is that %eip is masked to 0x0000ffff AFTER adding
> the offset.  The 32-bit version doesn't do this.  I can't see this
> behavior being of *any* use in a 32-bit program, unless you *really*
> know what you're doing.
> 

Ken, Ian, I have sent you guys a patch for that. You don't like
it. It may bit them now.


-- 
H.J. Lu
NYNEX Science and Technology, Inc.			hjl@nynexst.com