Path: utzoo!attcan!uunet!seismo!sundc!pitstop!sun!lxviiik!johnz
From: johnz@lxviiik.uucp (John Zolnowsky)
Newsgroups: comp.sys.m68k
Subject: Re: addq.w #n,sp and a pop quiz
Message-ID: <33545@lxviiik.uucp>
Date: 12 Dec 88 18:30:41 GMT
References: <1737@oakhill.UUCP>
Distribution: na
Organization: Sun Microsystems, Inc. - Mtn View, CA
Lines: 13

From article <1737@oakhill.UUCP>, by davet@oakhill.UUCP (David Trissel):
> There is only one place in the instruction set where a data register is
> implicitly sign-extended. Where?
> 
> I'll post the answer in a few days (if nobody else does.)
>   -- Dave Trissel  Motorola Semiconductor, Austin Texas

Suggested clarification:  What Dave means is that the data register is
a destination operand rather than a source operand.  In the latter case,
there are ADDA/SUBA Dn,An and the use of a data register as a word-sized
index.

					-John Zolnowsky     sun!johnz