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From: cramer@infoswx.UUCP
Newsgroups: comp.sys.m68k
Subject: Re: Recent Motorola ad seen in Byte
Message-ID: <125900004@infoswx>
Date: Fri, 15-May-87 08:22:00 EDT
Article-I.D.: infoswx.125900004
Posted: Fri May 15 08:22:00 1987
Date-Received: Sun, 17-May-87 19:44:17 EDT
References: <362@sbcs.UUCP>
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Nf-ID: #R:sbcs.UUCP:362:infoswx:125900004:000:770
Nf-From: infoswx.UUCP!cramer    May 15 07:22:00 1987


> >>1. how would you code a string instruction like FFS (find first set bit)
> >>   to fit in something like the 68010's single instruction looping
> >>   feature/cache?
> > 	moveq.l	#31,D0
> > 	move.l 	ea,D1
> > loop	asl.l	#1,D1
> > 	dbcs 	loop
> > 
> A minor point.  According to "M68000 16/32-Bit Microprocessor", Programmer's
> Reference Manual, Fourth Edition, page 218, Table G-1:
	> asl.l	#1,D1
> is not listed as a loopable instruction.
> 
> allen
>

For whatever it's worth, Table 4-11 of "68000 Microprocessor Handbook, 2nd Ed" 
(Osborne/McGraw-Hill) lists ASL as a loopable instruction.  It seems likely
to be one, in as much as it translates to a single word instruction (the basic
requirement for loopable instructions).

Bill Cramer
!ihnp4!infoswx!cramer