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From: robinson@renoir.Berkeley.EDU (Michael Robinson)
Newsgroups: comp.sys.m68k
Subject: 68000 shift/rotate timings
Message-ID: <19497@ucbvax.BERKELEY.EDU>
Date: Sat, 27-Jun-87 20:42:32 EDT
Article-I.D.: ucbvax.19497
Posted: Sat Jun 27 20:42:32 1987
Date-Received: Sun, 28-Jun-87 04:53:21 EDT
Sender: usenet@ucbvax.BERKELEY.EDU
Reply-To: robinson@renoir.Berkeley.EDU (Michael Robinson)
Distribution: world
Organization: University of California, Berkeley
Lines: 12

The Signetics S68000 Users Guide (which is just a photo-reduction of 
the Motorola manual) shows the cycle timings to shift a word in a register
as 6+2n (where n is the number of bits to shift), but gives the cycle
timing to shift a word in memory as 8 plus effective address overhead.
 
Is this a misprint?  If not, why is the time to shift a register a 
function of n, but the time to shift memory a constant?


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Mike Robinson                                 USENET:  ucbvax!ernie!robinson
                                              ARPA: robinson@ernie.berkeley.edu