From: Segher Boessenkool <segher@kernel.crashing.org>
To: Arnd Bergmann <arnd@arndb.de>
Cc: linuxppc-dev@ozlabs.org, cbe-oss-dev@ozlabs.org
Subject: Re: [Cbe-oss-dev] [RFC, PATCH] selection of CPU optimization
Date: Fri, 13 Apr 2007 20:43:02 +0200 [thread overview]
Message-ID: <00df01c80b8b5153a04a7cbe0bc727f2@kernel.crashing.org> (raw)
In-Reply-To: <200704130210.48508.arnd@arndb.de>
> My understanding at this point is that we can always fall back
> to -mcpu=powerpc or -mcpu=powerpc64,
Yes. With perhaps and added -mno-string or similar if
some supported CPU really needs it.
> and also
[SNIP]
> So if we select e.g. power6 and cell, it needs to fall back to power4,
> which is the common subset. Selecting both 403 and 405 would result
> in falling back to -mcpu=powerpc, because they don't have any larger
> subset.
This is way complicated. Also, it is not unique to the
kernel; you'd be better off adding this logic to the
compiler itself. OTOH, it's such a niche market, maybe
the distros that want it (if any do) should do this in
their RPM build scripts or similar.
Segher
prev parent reply other threads:[~2007-04-13 18:43 UTC|newest]
Thread overview: 33+ messages / expand[flat|nested] mbox.gz Atom feed top
2007-04-10 11:15 [patch 3/3] cell: prevent alignment interrupt on local store Akinobu Mita
2007-04-10 12:52 ` Segher Boessenkool
2007-04-11 3:06 ` Akinobu Mita
2007-04-10 21:22 ` Benjamin Herrenschmidt
2007-04-11 2:56 ` Akinobu Mita
2007-04-11 3:30 ` Benjamin Herrenschmidt
2007-04-11 21:03 ` Segher Boessenkool
2007-04-12 4:23 ` Olaf Hering
2007-04-12 5:26 ` Benjamin Herrenschmidt
2007-04-12 6:33 ` Olaf Hering
2007-04-12 6:38 ` Benjamin Herrenschmidt
2007-04-12 8:31 ` Gabriel Paubert
2007-04-12 8:48 ` Benjamin Herrenschmidt
2007-04-12 6:50 ` Segher Boessenkool
2007-04-12 6:57 ` [Cbe-oss-dev] " Michael Ellerman
2007-04-12 7:07 ` Segher Boessenkool
2007-04-12 18:43 ` Arnd Bergmann
2007-04-12 18:55 ` Arnd Bergmann
2007-04-12 19:57 ` Segher Boessenkool
2007-04-12 19:52 ` Segher Boessenkool
2007-04-12 13:01 ` [RFC, PATCH] selection of CPU optimization Arnd Bergmann
2007-04-12 16:45 ` Kumar Gala
2007-04-12 17:26 ` [Cbe-oss-dev] " Arnd Bergmann
2007-04-12 18:17 ` Kumar Gala
2007-04-12 19:25 ` Arnd Bergmann
2007-04-12 20:04 ` Olof Johansson
2007-04-12 20:01 ` Segher Boessenkool
2007-04-12 20:22 ` Olof Johansson
2007-04-12 20:22 ` Segher Boessenkool
2007-04-12 19:50 ` Segher Boessenkool
2007-04-13 0:10 ` Arnd Bergmann
2007-04-13 2:03 ` Olof Johansson
2007-04-13 18:43 ` Segher Boessenkool [this message]
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