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From: john@ghostwheel.unm.edu (John Prentice)
Newsgroups: comp.lang.fortran
Subject: Re: Array Notation
Message-ID: <1991Jan4.004719.21640@ariel.unm.edu>
Date: 4 Jan 91 00:47:19 GMT
Sender: news@ariel.unm.edu (News supported software)
Organization: University of New Mexico, Albuquerque, NM
Lines: 19

In article <10818@uhccux.uhcc.Hawaii.Edu> tholen@uhccux.uhcc.Hawaii.Edu (David Tholen) writes:
>
>So the problem isn't limited to the Cray compiler.  What I'd like to know are
>the kind of situations in which array notation slows things down. 

The sort of place I expect the Cray has trouble with array syntax is:
       A=B+C
       D=E+F
where these arrays are all the same length.  In a do-loop, one would do:
       do 10 i=1,len
           a(i)=b(i)+c(i)
           d(i)=e(i)+f(i)
   10  continue
and this would easily vectorize within a single loop.  Will the Cray
compiler interpret the array syntax equivalent the same way?

John K. Prentice
Amparo Corporation
Albuquerque, NM