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From: cdm@gem-hy.Berkeley.EDU (Dale Cook)
Newsgroups: comp.lang.fortran
Subject: Re: Fortran vs. C for numerical work (SUMMARY)
Message-ID: <1990Nov30.202538.23600@inel.gov>
Date: 30 Nov 90 20:25:38 GMT
References: <7200@lanl.gov> <2392:Nov2902:59:0590@kramden.acf.nyu.edu> <1990Nov29.040910.7400@kithrup.COM> <2630@charon.cwi.nl>
Sender: news@inel.gov
Reply-To: cdm@gem-hy.Berkeley.EDU (Dale Cook)
Organization: Idaho National Engineering Laboratory, Idaho Falls, Idaho
Lines: 36

In article <2630@charon.cwi.nl>, dik@cwi.nl (Dik T. Winter) writes:
|> In article <1990Nov29.040910.7400@kithrup.COM> sef@kithrup.COM (Sean
Eric Fagan) writes:
|>  > In article <2392:Nov2902:59:0590@kramden.acf.nyu.edu>
brnstnd@kramden.acf.nyu.edu (Dan Bernstein) writes:
|>  > >(I
|>  > >don't like this situation; converting to floating point just to multiply
|>  > >quickly on a Cray seems rather silly.)
|>  > 
|>  > Uhm... you don't have to, I don't think.  A Cyber had only one type of
|>  > multiply instruction, but if the exponent were 0, it did an integer
|>  > multiplication.  I believe Cray's do the same thing.
|>  > 
|> No.  The Cybers give indeed the lower half of the product of two integers
|> (and the other multiply instruction gives the upper part, although that is
|> not documented).  The Cray returns the upper part if the two exponents are
|> zero.  But the Cray has a 24x24->24 bit integer multiply and as a compiler
|> option you can use 24 bit integers.
|> --

Not on our Cray XMP system.  One has the option of 46 or 64 bit integers.

--- Dale Cook    cdm@inel.gov

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