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Re: IRA performance regressions on PPC
- From: "H.J. Lu" <hjl dot tools at gmail dot com>
- To: luisgpm at linux dot vnet dot ibm dot com
- Cc: gcc at gcc dot gnu dot org, "Vladimir Makarov" <vmakarov at redhat dot com>
- Date: Fri, 5 Sep 2008 07:16:09 -0700
- Subject: Re: IRA performance regressions on PPC
- References: <1220623176.18640.42.camel@gargoyle>
On Fri, Sep 5, 2008 at 6:59 AM, Luis Machado <luisgpm@linux.vnet.ibm.com> wrote:
> Hi Vladimir,
>
> I was just going through some benchmarks on PPC and noticed that your
> patch from 08/26 (http://gcc.gnu.org/ml/gcc-cvs/2008-08/msg01152.html)
> caused a significant regression on both facerec (~17%) and applu (~4%)
> for 64-bit PPC.
>
> There are other degradations that i'm still working on isolating the
> cause, just to give you a heads up on the problem.
>
Can you try ira-merge branch? There is one patch:
http://gcc.gnu.org/ml/gcc-patches/2008-09/msg00427.html
which is supposed to improve SPEC CPU performance.
But no one can explain why.
Thanks.
--
H.J.