Date: Fri, 12 Mar 1999 14:36:40 +0100 (MET) From: Henrik Berglund SdU X-Sender: adb94hbd AT legolas DOT mdh DOT se To: pgcc AT delorie DOT com Subject: Re: AMDK6 optimized kernel and others In-Reply-To: Message-ID: MIME-Version: 1.0 Content-Type: TEXT/PLAIN; charset=US-ASCII Reply-To: pgcc AT delorie DOT com X-Mailing-List: pgcc AT delorie DOT com X-Unsubscribes-To: listserv AT delorie DOT com Precedence: bulk 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/