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Re: Performance optimizations for Intel Core 2 and Core i7 processors

From: Maxim Kuvyrkov <maxim at codesourcery dot com>
To: "Vladimir N. Makarov" <vmakarov at redhat dot com>
Cc: GCC <gcc at gcc dot gnu dot org>, gcc-patches <gcc-patches at gcc dot gnu dot org>, "H.J. Lu" <hjl dot tools at gmail dot com>
Date: Wed, 26 May 2010 19:09:20 +0400
Subject: Re: Performance optimizations for Intel Core 2 and Core i7 processors
References: <4BF0E5E9.3010405@codesourcery.com> <4BF6BD89.1030201@redhat.com>

On 5/21/10 9:06 PM, Vladimir N. Makarov wrote:

On 05/17/2010 02:44 AM, Maxim Kuvyrkov wrote:

...

If your favorite benchmark significantly under-performs on Core 2 or
Core i7 CPUs, don't hesitate asking us to take a look at it.
What I saw is people complaining about -mtune=core2 for polyhedron

http://gcc.gnu.org/ml/gcc-patches/2010-02/msg01272.html

The biggest complaint was on mdbx (about 16%).

Thank you for the pointers and analysis!

...

Also I think it is important to have a pipeline description for
Core2/Core i7 or at least to use it from generic.

Right. We will be adding a pipeline description for Core 2/i7.

Thank you,

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

References:
- Performance optimizations for Intel Core 2 and Core i7 processors
  - From: Maxim Kuvyrkov
- Re: Performance optimizations for Intel Core 2 and Core i7 processors
  - From: Vladimir N. Makarov

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