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Re: Serious SPEC CPU 2006 FP performance regressions on IA32
- From: "H. J. Lu" <hjl at lucon dot org>
- To: Uros Bizjak <ubizjak at gmail dot com>
- Cc: gcc at gcc dot gnu dot org, evandro dot menezes at amd dot com
- Date: Fri, 8 Dec 2006 10:55:18 -0800
- Subject: Re: Serious SPEC CPU 2006 FP performance regressions on IA32
- References: <20061208180550.GA7437@lucon.org> <4579B171.5000105@gmail.com>
On Fri, Dec 08, 2006 at 07:39:45PM +0100, Uros Bizjak wrote:
> H. J. Lu wrote:
>
> >Gcc 4.3 revision 119497 has very poor SPEC CPU 2006 FP performance
> >regressions on P4, Pentium M and Core Duo, comparing aganst
> >gcc 4.2 20060910. With -O2, the typical regressions look like
> >
> >
> >
> I think that you are looking at the same problem as
> http://gcc.gnu.org/ml/gcc/2006-12/msg00017.html.
>
I am not sure. I don't have SPEC CPU 2000 FP performance regressions
on x86-64 with -O2 -ffast-math. Again, my regressions are at -O2.
H.J.