IRA performance regressions on PPC

H.J. Lu hjl.tools@gmail.com
Fri Sep 5 14:17:00 GMT 2008


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.



More information about the Gcc mailing list