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From: emv@math.lsa.umich.edu (Edward Vielmetti)
Newsgroups: comp.unix.ultrix
Subject: Re: C optimizer problem -- does DEC have a response?
Message-ID: <EMV.90Aug26134954@stag.math.lsa.umich.edu>
Date: 26 Aug 90 18:49:54 GMT
References: <1990Aug25.231005.29864@ircam.ircam.fr>
Sender: usenet@math.lsa.umich.edu
Organization: University of Michigan Math Dept., Ann Arbor MI.
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In-Reply-To: mf@ircam.ircam.fr's message of 25 Aug 90 23:10:05 GMT

In article <1990Aug25.231005.29864@ircam.ircam.fr> mf@ircam.ircam.fr (Michel Fingerhut) writes:

   Several public domain large packages of software fail to run correctly
   when compiled with any of the -O options of cc (under ultrix 3.1 that I
   know of, and 4.0 according to reports in this group).  This is notably
   true of TeX, and true (according to my experience) with perl.

There are some known limitations of the mips c compiler, including
the way it deals with volatile & some non-ansi behavior.  You have
not yet convinced me that it is the optimizer which is at fault.

Perl compiled here under Ultrix 4.0, fully optimized, after I dealt
with a few small problems (like not having enough memory....)

--Ed

Edward Vielmetti, U of Michigan math dept <emv@math.lsa.umich.edu>