Re: Core 2/i7 tuning results and analysis

[Maxim Kuvyrkov <maxim at codesourcery dot com>]

On 10/16/10 3:04 AM, H.J. Lu wrote:
> On Fri, Oct 15, 2010 at 3:08 AM, Maxim Kuvyrkov<maxim@codesourcery.com>  wrote:
> > [Resending without printed out version of the spreadsheet to fit into
> > gcc-patches@ size requirements.]
> >
> > I've been investigating performance regressions for Core 2 and Core i7
> > processors.  The impact of certain small tuning changes on x86 performance
> > maybe interesting to a wider audience, so here is my results and analysis.
> >
> > Attached is a tar of the patch set I tested.  Most of these patches are
> > dissections from earlier Bernd's work for Core 2/i7.
> >
> > + 0001-Basic-support-for-Core-i7.patch
> > + 0002-Enable-Core-i7-architectural-features.patch
> > ? 0003-Extend-Core-2-tune-features-to-Core-i7.patch
> > ? 0004-Tweak-tuning-for-Core-i7.patch
> > + 0005-Add-PROMOTE_HI_CONSTANTS-tuning.patch
> > + 0006-Define-Core-i7-costs.patch
> > + 0007-Use-64-bit-alignment-for-Core-i7-32-bit-mode.patch
> > + 0008-Configure-bits-for-Core-i7.patch
> > + 0009-Core-i7-DFA-model.patch
> > ? 0010-Define-issue_rate-for-Core-i7.patch
> > + 0011-Model-Core-i7-pipeline-domains.patch
> > - 0012-Update-Core-2-tuning.patch
> > + 0013-Use-Core-2-DFA-model-for-Core-2.patch
> > + 0014-Update-PentiumPro-tuning.patch
> > - 0015-Handle-privileged-insns.patch
> > + 0016-Model-Core2-i7-decoder-bottleneck.patch
>
> Hi Maxim,
>
> I will try your patches on Core 2 and Core i7 with SPEC CPU 2K/2006.
> Unfortunately, gcc has been failing SPEC CPU 2K/2006 for several
> weeks now:

FYI, I did the benchmarking against rev. 165150 dated Oct. 8.  I should 
have been lucky to capture a window of GCC mainline being OK.

Thanks,

--
Maxim Kuvyrkov
CodeSourcery
maxim@codesourcery.com
(650) 331-3385 x724