Date:	Fri, 12 Mar 1999 14:36:40 +0100 (MET)
From:	Henrik Berglund SdU <adb94hbd AT mds DOT mdh DOT se>
X-Sender:	adb94hbd AT legolas DOT mdh DOT se
To:	pgcc AT delorie DOT com
Subject:	Re: AMDK6 optimized kernel and others
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On 12 Mar 1999, Michael Hanke wrote:

> On Thu, 11 Mar 1999, Dan Melomedman (free video eden) wrote:
> 
> > without size optimization for K6. Also I noted that gzip compiled for
> > pentium is slower that gzip compiled for amdk6 on amd machine, this kinda
> > shows that amdk6 optimization actually works quite nicely. I use Stampede
> This note gives me the opportunity to ask about the real gain of pgcc
> on AMD chips. I have an old K5 processor. Since I am mainly
> interested in scientific computing, I would like to know the possible
> gain for fpu intense applications (e.g. BLAS). And the best possible
> flags (IEEE arithmetic is essential!). Recently, I am using gcc 2.7.2
> with -m486. Moreover, most programs are
> written in FORTRAN. Is there a pg77 available or should I resort to
> f2c?

I have notised that the 1.1.1 release of pgcc optimises better when it
comes to float than the snapshot but maybe a bit slower at int.

the best flags for good float are 
-O6 -march=amdk6 -funroll-all-loops -fforce-addr   
i think.

-----------------------------------------------------------------------------
Henrik DOT Berglund AT mds DOT mdh DOT se 
http://www.mds.mdh.se/~adb94hbd/

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