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From: allen@ccicpg.UUCP
Newsgroups: comp.sys.m68k,comp.sys.intel
Subject: Re: Recent Motorola ad seen in Byte
Message-ID: <1026@ccicpg.UUCP>
Date: Tue, 12-May-87 00:04:55 EDT
Article-I.D.: ccicpg.1026
Posted: Tue May 12 00:04:55 1987
Date-Received: Thu, 14-May-87 05:01:48 EDT
References: <8705030305.AA18195@cory.Berkeley.EDU> <280@fornax.uucp>
Reply-To: allen@ccicpg.UUCP (Allen Brumm)
Organization: CCI CPG, Irvine CA
Lines: 17
Xref: utgpu comp.sys.m68k:443 comp.sys.intel:220

>>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