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From: guy@rlgvax.UUCP (Guy Harris)
Newsgroups: net.micro.68k
Subject: Re: strange instruction.
Message-ID: <430@rlgvax.UUCP>
Date: Wed, 6-Feb-85 22:55:35 EST
Article-I.D.: rlgvax.430
Posted: Wed Feb  6 22:55:35 1985
Date-Received: Sat, 9-Feb-85 07:39:07 EST
References: <26@cvl.UUCP>
Distribution: net
Organization: CCI Office Systems Group, Reston, VA
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> Does anyone here *KNOW* what the 68K will do when confronted with the
> following instruction?
> 
>           move.w (A4)+,(A4)+

For those of you with insatiable curiosity, it behaves in the "most
straightforward" way - it picks up whatever A4 points to, bumps A4 by
2, drops the picked-up value at the location where A4 now points, and
bumps A4 again.  (Tested on a real live 68000)

	Guy Harris
	{seismo,ihnp4,allegra}!rlgvax!guy