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Subject: Re: [patch 3/3] cell: prevent alignment interrupt on local store
From: Benjamin Herrenschmidt <benh@kernel.crashing.org>
To: Olaf Hering <olaf@aepfle.de>
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Date: Thu, 12 Apr 2007 16:38:10 +1000
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Cc: Arnd Bergmann <arnd@arndb.de>, Akinobu Mita <mita@fixstars.com>,
	linuxppc-dev@ozlabs.org, Paul Mackerras <paulus@samba.org>,
	cbe-oss-dev@ozlabs.org
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On Thu, 2007-04-12 at 08:33 +0200, Olaf Hering wrote:
> On Thu, Apr 12, Benjamin Herrenschmidt wrote:
> 
> > Gets altivec and stops working on POWER5 ? no deal :-)
> 
> If there is a significant performance gain (not only 9%) and if
> -mcpu=$cell does not generate instructions that wont work on other
> altivec capable cpus and if rpm gets a target ppcaltivec.rpm (or
> similar), as separate binary tree can be done.

-mcpu=cell can possibly generate things that won't run on 970 and 74xx.
There are some new altivec instructions among others...

Ben.