From: Arnd Bergmann <arnd@arndb.de>
To: Josh Boyer <jwboyer@linux.vnet.ibm.com>
Cc: linuxppc-dev@ozlabs.org
Subject: Re: [PATCH] add Kconfig option for optimizing for cell
Date: Sat, 15 Sep 2007 03:02:23 +0200 [thread overview]
Message-ID: <200709150302.23743.arnd@arndb.de> (raw)
In-Reply-To: <1189811264.24878.3.camel@localhost.localdomain>
On Saturday 15 September 2007, Josh Boyer wrote:
> On Sat, 2007-09-15 at 02:21 +0200, Arnd Bergmann wrote:
> > Since the PPE on cell is an in-order core, it suffers significantly
> > from wrong instruction scheduling. This adds an Kconfig option that
> > enables passing -mtune=cell to gcc in order to generate object
> > code that runs well on cell.
>
> Which version of gcc supports that?
>
gcc-4.3 will be the first official release that has everything in it,
and I think 4.1 has some parts. However, there are many patched gcc
versions in various distributions, so I tried to avoid being too
specific about the version here.
Of course, on gcc versions that don't support -mtune=cell, the
Kconfig option does not make a difference.
Arnd <><
next prev parent reply other threads:[~2007-09-15 1:06 UTC|newest]
Thread overview: 8+ messages / expand[flat|nested] mbox.gz Atom feed top
2007-09-15 0:21 [PATCH] add Kconfig option for optimizing for cell Arnd Bergmann
2007-09-14 23:07 ` Josh Boyer
2007-09-15 1:02 ` Arnd Bergmann [this message]
2007-09-14 23:36 ` Josh Boyer
2007-09-15 0:50 ` Segher Boessenkool
2007-09-15 1:02 ` Arnd Bergmann
2007-09-15 13:13 ` David Woodhouse
2007-09-15 13:30 ` Arnd Bergmann
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