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From: terryl@tekcrl.TEK.COM
Newsgroups: comp.sys.m68k
Subject: Re: Recent Motorola ad seen in Byte
Message-ID: <1640@tekcrl.TEK.COM>
Date: Wed, 13-May-87 13:09:48 EDT
Article-I.D.: tekcrl.1640
Posted: Wed May 13 13:09:48 1987
Date-Received: Sat, 16-May-87 07:09:18 EDT
References: <8705130713.AA24919@cory.Berkeley.EDU>
Reply-To: terryl@tekcrl.tek.com
Distribution: na
Organization: Tektronix, Inc., Beaverton, OR.
Lines: 24

In article <8705130713.AA24919@cory.Berkeley.EDU> dillon@CORY.BERKELEY.EDU (Matt Dillon) writes:
+: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
+	
+	According to table G-1, ASL certainly IS a loopable instruction.
+Re-read your manual.... it's in the second column.  Furthermore, instruction
+cycle times for ASL in loop mode are given on page 212, table F-13.
+
+	No apology necessary.
+
+				-Matt

     Sorry, Matt, I suggest you re-read your manual, specifically, the "Ap-
plicable Addressing Modes" column. The ONLY loopable shift instructions are
the shift instructions that shift MEMORY one bit at a time (word-sized), and
address the operand as (Ay), (Ay)+, or -(Ay). So allen is correct;

	asl.l	#1,D1

is NOT a loopable instruction.