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From: amos@instable.UUCP
Newsgroups: comp.arch
Subject: Re: 64 Vs 32
Message-ID: <751@instable.UUCP>
Date: Wed, 22-Apr-87 09:45:40 EST
Article-I.D.: instable.751
Posted: Wed Apr 22 09:45:40 1987
Date-Received: Fri, 24-Apr-87 02:01:56 EST
References: <3810013@nucsrl.UUCP> <28200016@ccvaxa> <1316@ames.UUCP> <1071@osiris.UUCP>
Reply-To: amos%nsta@nsc.com (Amos Shapir)
Distribution: world
Organization: National Semiconductor (Israel) Ltd. Home of the 32532
Lines: 15
Summary: Locality will still be with us.
Hdate: 23 Nisan 5747

To increase  flexibility, processors that  can access 64  bits of
addressing will  probably do it  the old fashioned way:  by using
one word (32  bits) as a base address, and  another as an offset.
There's no point  in dragging all 64  bits everywhere, especially
since  processing   is  usually   localized  among   clusters  of
addresses.

Also  keep  in  mind  that  future processors  will  have  to  be
compatible with older programs -  the programs we are writing now
on 32-bit address machines!
-- 
	Amos Shapir
National Semiconductor (Israel)
6 Maskit st. P.O.B. 3007, Herzlia 46104, Israel  Tel. (972)52-522261
amos%nsta@nsc.com {hplabs,pyramid,sun,decwrl} 34.48'E 32.10'N