Path: utzoo!attcan!uunet!ncrlnk!ncr-sd!hp-sdd!hplabs!hpl-opus!hpccc!hp-sde!hpdml93!jlyle
From: jlyle@hpdml93.HP.COM (Jeff Lyle)
Newsgroups: comp.sys.m68k
Subject: Re: addq.w #n,sp and a pop quiz
Message-ID: <3460001@hpdml93.HP.COM>
Date: 12 Dec 88 22:00:41 GMT
References: <1737@oakhill.UUCP>
Organization: HP Disk Memory Division - Boise, ID
Lines: 16

> Instructions depending on esoteric architectural features such as the above
> separate the men from the boys. Here's another one:

Or working code from code with features???

> There is only one place in the instruction set where a data register is
> implicitly sign-extended. Where?
>
>   -- Dave Trissel  Motorola Semiconductor, Austin Texas

The MOVEM.W instruction has the rather NASTY feature of sign extending
its data when the destination is a register.  Yes it IS documented in
the fine print.  No, I did not read the fine print before discovering
this!

  - Jeff Lyle (hpdmlac)