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From: shelby@rtech.ARPA (Shelby Thornton)
Newsgroups: net.micro.68k
Subject: Re: strange instruction.
Message-ID: <150@rtech.ARPA>
Date: Thu, 14-Feb-85 19:53:43 EST
Article-I.D.: rtech.150
Posted: Thu Feb 14 19:53:43 1985
Date-Received: Sun, 17-Feb-85 06:53:47 EST
References: <26@cvl.UUCP>
Distribution: net
Organization: Relational Technology, Berkeley CA
Lines: 16

> Does anyone here *KNOW* what the 68K will do when confronted with the
> following instruction?
> 
>           move.w (A4)+,(A4)+
> 

This instruction will take the contents of the address in A4 and duplicate
it at the contents of A4+1.

For example, if A4 points to the string "abcd", after this instruction is
executed, the string will be "abab".  To make sure I was correct I wrote a
simple test case and it did exactly this.


						Shelby Thornton
						Relational Technology