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Article #2416Re: ORed indexes
From: Scott Dorsey
Date: Wed, 23 Apr 1986 23:26
Date: Wed, 23 Apr 1986 23:26
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In article <5100066@ccvaxa> aglew@ccvaxa.UUCP writes:
>
>How would you react to an instruction set that had no indexed addressing
>mode, but did have a mode where a register was ORed into the address?
Cute. I like it. From the looks of it, this would make record types
easy to implement. It sounds familiar.. I have seen it on one of the newer
32-bit processors in addition to indexed addressing. It wouldn't replace
indexing too well except maybe on a machine with a slow add. Newer boxes
often have an adder seperate from the ALU to handle indexing which takes so
little time to do the calculation that such a scheme really wouldn't make
all that much sense as an indexed replacement. This is not to say that
I wouldn't like it; how about two registers, one added, then the other or'ed.
--
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Disclaimer: Everything I say is probably a trademark of someone. But
don't worry, I probably don't know what I'm talking about.
Scott Dorsey " If value corrupts
kaptain_kludge then absolute value corrupts absolutely"
ICS Programming Lab (Where old terminals go to die), Rich 110,
Georgia Institute of Technology, Box 36681, Atlanta, Georgia 30332
...!{akgua,allegra,amd,hplabs,ihnp4,seismo,ut-ngp}!gatech!gitpyr!kludge
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Relay-Version: version B 2.10 5/3/83; site utzoo.UUCP Path: arc1-ca.pugleaf.net!utzoo!watmath!clyde!cbosgd!gatech!gitpyr!kludge From: kludge@gitpyr.UUCP (Scott Dorsey) Newsgroups: net.arch Subject: Re: ORed indexes Message-ID: <1706@gitpyr.UUCP> Date: Wed, 23-Apr-86 18:26:27 EST Article-I.D.: gitpyr.1706 Posted: Wed Apr 23 18:26:27 1986 Date-Received: Thu, 24-Apr-86 07:38:58 EST References: <5100066@ccvaxa> Reply-To: kludge@gitpyr.UUCP (Scott Dorsey) Organization: Georgia College Of Universal Knowledge Lines: 26