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From: mike@hpfcdc.HP.COM (Mike McNelly)
Newsgroups: comp.lang.fortran
Subject: Re: FORTRAN array aliasing -- potential problems?
Message-ID: <5140006@hpfcdc.HP.COM>
Date: 1 Aug 89 15:12:19 GMT
References: <8907311910.AA15243@robalo.nyu.edu>
Organization: HP Ft. Collins, Co.
Lines: 13

As most of the responses have indicated, the real problem with using
parameters to "equivalence" arrays as you've done is in optimization.
Most optimizers assume that formal arguments have distinct memory
locations so that they can be manipulated as distinct entities.  If that
is not the case, you will run into problems with most of the
conventional optimization techniques.

Some compilers have mechanisms to alter this assumption at the expense
of limiting optimization.  I'm familiar with HP 9000 machines which have
this capability.

Mike McNelly
mike%hpfcla@hplabs.hp.com