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From: brnstnd@kramden.acf.nyu.edu (Dan Bernstein)
Newsgroups: comp.lang.fortran,comp.lang.c
Subject: Re: Fortran vs. C for numerical work (SUMMARY)
Message-ID: <6493:Nov3006:03:3790@kramden.acf.nyu.edu>
Date: 30 Nov 90 06:03:37 GMT
References: <1990Nov29.040910.7400@kithrup.COM> <7318@lanl.gov>
Organization: IR
Lines: 15

In article <7318@lanl.gov> jlg@lanl.gov (Jim Giles) writes:
> The Crays have an integer multiply unit for addresses.  This mult
> takes 4 clocks.

But isn't that only for the 24-bit integer? If you want to multiply full
words you have to (internally) convert to floating point, multiply, and
convert back.

I have dozens of machines that can handle a 16MB computation; I'm not
gonig to bother with a Cray for those. The biggest advantage of the Cray
line (particularly the Cray-2) is its huge address space.

So what's the actual time for multiplying integers?

---Dan


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