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From: gl8f@astsun.astro.Virginia.EDU (Greg Lindahl)
Newsgroups: comp.lang.misc
Subject: Re: Aggressive optimization
Message-ID: <1990Nov6.224410.15068@murdoch.acc.Virginia.EDU>
Date: 6 Nov 90 22:44:10 GMT
References: <TED.90Oct26124614@kythera.nmsu.edu> <4950@avocado5.UUCP> <2133:Nov607:16:1090@kramden.acf.nyu.edu>
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Organization: Department of Astronomy, University of Virginia
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In article <2133:Nov607:16:1090@kramden.acf.nyu.edu> brnstnd@kramden.acf.nyu.edu (Dan Bernstein) writes:

>I observe that when I convert the original code into pointer code, the
>compiler produces very similar results to the hand version.

Maybe you should have tried gcc -- it does quite a bit better than cc
on this simple exaple, *which includes no alias possibilties*.

Real array code has possible aliasing all over the place.