Path: utzoo!utgpu!news-server.csri.toronto.edu!rpi!usc!sdd.hp.com!hp-col!hpldola!hp-lsd!bsb
From: bsb@hp-lsd.COS.HP.COM (Brett Baumberger)
Newsgroups: comp.sys.m68k
Subject: Re: cost of chips (was Re: diff 68000 68010 (really 68010))
Message-ID: <9000004@hp-lsd.COS.HP.COM>
Date: 18 Apr 91 22:01:01 GMT
References: <1991Apr17.114247.6446@cs.umu.se>
Organization: HP Logic Systems Division - Col
Lines: 16

Yes, there is another advantage.  It is called "loop mode".  It is
used effectively with DBcc.  In loop mode, the 68010 doesn't have to
refetch the DBcc instruction or the instuction it is looping to.
This only works for 2 word loops.

Example:
            MOVE.W  #data,D0    ;loopcounter
LOOP        MOVE.W  (A0)+,(A1)+
            DBEQ    D0,LOOP

The last 2 instructions would remain in the prefetch queue and not
need to be fetched.

Brett Baumberger
HP North American Response Center
Microprocessor Emulation Support