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RE: GCC 4.1.0 Released

When -mtune=generic was added, it was expected that it would go into the
4.2 GCC release, since it clearly missed the 4.1 window for new
features.  As desirable for both AMD and Intel that the new behavior be
propagated, I feel like Mark that it should wait for GCC 4.2, since it
clearly is a new feature.  However, if it does go in, it will be for the
good, but I'm not pressing for it.

Note, in this case, I am not officially speaking for AMD (though I have
taken part in discussions on our side about adding the generic tuning

-----Original Message-----
From: [] On Behalf Of
Mark Mitchell
Sent: Wednesday, March 01, 2006 8:22 PM
To: H. J. Lu
Cc: Steven Bosscher;; Richard Guenther;
Subject: Re: GCC 4.1.0 Released

H. J. Lu wrote:

> You are comparing apply with orange. If a user uses -O2, he/she will
> see much more than that.

We can argue about that, but I don't think so.  I'm comparing a user can
achieve without the patch with the performance they can achieve with the
patch.  On all chips, for all time, users have been expected to specify
their target CPU in order to get good performance.  It's swell that GCC
4.2 will work better by default on IA32, but that's not a compelling
argument for a backport.

Mark Mitchell
(650) 331-3385 x713

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