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From: jimomura@lsuc.UUCP
Newsgroups: comp.arch,comp.sys.m68k
Subject: Re: Bit operations on 68K
Message-ID: <1539@lsuc.UUCP>
Date: Tue, 27-Jan-87 17:57:59 EST
Article-I.D.: lsuc.1539
Posted: Tue Jan 27 17:57:59 1987
Date-Received: Tue, 27-Jan-87 21:58:01 EST
References: <760@orcisi.UUCP> <112@lmi-angel.UUCP> <816@drivax.UUCP>
Sender: root@lsuc.UUCP
Reply-To: jimomura@lsuc.UUCP (Jim Omura)
Organization: Consultant, Toronto
Lines: 27
Summary: BSET.L--Is there or isn't there?
Xref: lsuc comp.arch:235 comp.sys.m68k:165

In article <816@drivax.UUCP> alexande@drivax.UUCP (Mark Alexander) writes:

...

>This is not completely correct.  There is no BSET.L instruction, only BSET.
>It works on a destination that is either a 32-bit register, or a byte from
>memory. Here is what the Motorola book says about BSET:
>
>	If a data register is the destination, then the bit numbering is
>	modulo 32, allowing bit manipulation on all bits in a data register.
>	If a memory location is the destination, a byte is read
>	from that location, the bit operation is performed using
>	the bit number modulo 8, and the byte written back to
>	the location with zero referring to the least-significant bit.

>I didn't take the manual's word for it.  I tried it on a Motorola VME/10.


     In Kelly-Bootle and Fowler "68000, 68010, 68020 Primer", page 207 they
say that there is a 'bset.l' instruction.  Could it be that this is in the
68020?  (This isn't entirely academic for me since I'll have an '020 fairly
soon.)

Cheers! -- Jim O.
James Omura
2A King George's Drive
Toronto, Ontario (416) 652-3880