From mboxrd@z Thu Jan 1 00:00:00 1970 From: Oleg Krivosheev To: egcs@cygnus.com Subject: Re: egcs: A new compiler project to merge the existing GCC forks (fwd) Date: Tue, 19 Aug 1997 05:08:01 -0000 Message-ID: In-reply-to: 12382.871964822@hurl.cygnus.com X-SW-Source: 1997-08/0131.html Message-ID: <19970819050801.XXK8jJsYcIZ3qQ9D668JoJ9DvAc_nXh4xd4MNgM0vZM@z> Hi, On Mon, 18 Aug 1997, Jeffrey A Law wrote: > HJ, can you work with this person to find out _why_ performance > is suffering? > > If nobody takes the time to analyze these problems, then performance > is never going to get significantly better. can old scheduler be the source of the problem? i was able to figure out switch --enable-haifa only looking into ./configure script. New scheduler is off by default. Can someone point me the location of mdbench? i'll benchmark it... regards OK > > In message you write: > > Forwarded message: > > >From paehler@atlas.rc.m-kagaku.co.jp Mon Aug 18 19:09:18 1997 > > Date: Tue, 19 Aug 1997 11:09:07 +0900 > > From: Arno PAHLER > > Message-Id: <199708190209.LAA04886@atlas.rc.m-kagaku.co.jp> > > To: "H.J. Lu" > > In-reply-to: "H.J. Lu"'s message of Sun, 17 Aug 1997 09:12:40 -0700 > > Subject: egcs: A new compiler project to merge the existing GCC forks > > > > > > I downloaded this a few days ago - compiles and runs without any > > problems on a PentiumPro Linux 2.0.30 (Redhat 4.2) system - but: > > > > execution speed (floating point) of a test case (mdbench) compiled > > with f2c+gcc is about 10% slower than using gcc 2.7.2.1 - it is > > about the same or very slighly faster than g77 0.5.19.1 when using > > g77 0.5.21 - when using single precision both f2c+gcc and g77 are > > about 10-25% slower than their gcc 2.7.2.1/g77 0.5.19.1 counter- > > parts. > > > > I had hoped that performance would improve rather than get worse - > > is it so hard to optimize for x86? - I am back right now to the old > > stuff, unless I get to hear a convincing reason why to switch. > > > > > > Arno > > > > > > -- > > H.J. Lu (hjl@gnu.ai.mit.edu) > Oleg Krivosheev, MS 345, AD/Physics, Fermi National Accelerator Laboratory, P.O.Box 500, Batavia, Illinois, 60510. phone: (630) 840 8460 FAX : (630) 840 4552 Email: kriol@fnal.gov