Re: Safety and legality of optimizations

jim@meiko.co.uk (James Cownie)
Fri, 21 Apr 1995 09:05:53 GMT

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Newsgroups: comp.compilers
From: jim@meiko.co.uk (James Cownie)
Keywords: design, Fortran
Organization: Meiko Ltd.
References: 95-04-128
Date: Fri, 21 Apr 1995 09:05:53 GMT

Since this is now discussing purity of functions, you should
note that HPF has a PURE function attribute, precisely to allow the
compiler to be sure that the function is side effect free, and can therefore
be used in contexts (such as a FORALL) where functions with side effects
would not be valid.


As defined in HPF PURE subroutines are defined, and are permitted to modify
INTENT OUT or INTENT INOUT arguments. (Of course they'd be completely null if
they couldn't do this !).


I believe that the Fortran 95 (?) standard is intending to adopt parts of HPF
(including FORALL), so PURE may well be on its way into standard Fortran.


---Jim


James Cownie
Meiko Limited Meiko Inc.
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England MA 01742


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