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From: eugene@pioneer.UUCP
Newsgroups: comp.arch
Subject: Re: 64 Vs 32
Message-ID: <1351@ames.UUCP>
Date: Thu, 23-Apr-87 11:55:51 EST
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Posted: Thu Apr 23 11:55:51 1987
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>
>(a) You mean I can't declare
>
>	integer array huge[0:1048575] ?
>
Here's one from the "real world" [term I was given when asked to give an
ACM talk to one of the CSU schools].

One of my assignments at JPL was to get SPICE running on a VAX [VMS]
(back in 1980).  I was given the assignment because there were few VAXen
at JPL then and it would not run on the Univac [1100/81].  The reason
why it would not run on the Univac was the new big array SPICE uses for
a temporary array was :
	DIMENSION TEMP(80000)
Univac addressing only allows 65K words of data space.  I also have
this program waiting for some standalone time:

	DIMENSION IA(256000000)
	t1 = second()
	do 1 i = 1,256000000
	 ia(i) = 0.0
1	continue
	t2 = second()
	time = t2-t1
	write(*,*) time
	stop
	end

So as VLSI goes, I see its simulation as a minimum O(n^2) problem. Just
a matter of time before 64-bits is needed.

From the Rock of Ages Home for Retired Hackers:

--eugene miya
  NASA Ames Research Center
  eugene@ames-aurora.ARPA
  "You trust the `reply' command with all those different mailers out there?"
  "Send mail, avoid follow-ups.  If enough, I'll summarize."
  {hplabs,hao,ihnp4,decwrl,allegra,tektronix,menlo70}!ames!aurora!eugene