From: Mark Hatle <fray@mvista.com>
To: joakim.tjernlund@lumentis.se
Cc: Tom Rini <trini@kernel.crashing.org>,
LinuxPPC <linuxppc-embedded@lists.linuxppc.org>,
alan@lxorguk.ukuu.org.uk
Subject: Re: ppc_8xx-gcc 2.95.3 Monta Vista does not do ANY loop unrolling
Date: Tue, 12 Nov 2002 13:56:46 -0600 [thread overview]
Message-ID: <3DD15CFE.9060602@mvista.com> (raw)
In-Reply-To: IGEFJKJNHJDCBKALBJLLAEPBFHAA.joakim.tjernlund@lumentis.se
From one of our compiler guys in relationship to your original question:
> Later Alan Cox pointed out that my changes makes x86 run slower and it turns
> out that on x86 and a fairly new gcc will automatically unroll loops 'where
> appropriate'
Fairly new: 3.3-pre only.
Now I wonder:
> Is this a gcc 2.95.3, PPC or Monta Vista limitation?
2.95.3.
> Which compiler will do unrolling 'where appropriate' for 8xx PPC and
> Where can I get a precompiled version?
Nowhere, nor is using it for your kernels necessarily a good idea if
you don't have compiler experience.
> I know Dan is handling the enet stuff, but since you both work
Dan no longer works for MontaVista. (And has not for some time now.)
> for MV(don't you?) I figured you might know, being an insider and all :-)
>
> Maybe your tweak stuff could make use of forced unrolling?
>
> Jocke
** Sent via the linuxppc-embedded mail list. See http://lists.linuxppc.org/
next prev parent reply other threads:[~2002-11-12 19:56 UTC|newest]
Thread overview: 16+ messages / expand[flat|nested] mbox.gz Atom feed top
2002-11-12 8:12 ELDK 2.0, glibc and kernel 2.4.20??? Steven Scholz
2002-11-12 9:40 ` ppc_8xx-gcc 2.95.3 Monta Vista does not do ANY loop unrolling Joakim Tjernlund
2002-11-12 15:22 ` Tom Rini
2002-11-12 16:09 ` Joakim Tjernlund
2002-11-12 16:25 ` Tom Rini
2002-11-12 16:46 ` Joakim Tjernlund
2002-11-12 18:40 ` Tom Rini
2002-11-12 21:30 ` Joakim Tjernlund
2002-11-12 19:56 ` Mark Hatle [this message]
2002-11-12 21:33 ` Joakim Tjernlund
2002-11-12 12:39 ` ELDK 2.0, glibc and kernel 2.4.20??? wolfgang.grandegger
2002-11-12 12:58 ` Steven Scholz
-- strict thread matches above, loose matches on Subject: below --
2002-11-12 9:56 ppc_8xx-gcc 2.95.3 Monta Vista does not do ANY loop unrolling Jaap-Jan Boor
2002-11-12 10:42 ` Joakim Tjernlund
2002-11-12 10:49 Jaap-Jan Boor
2002-11-12 10:55 ` Joakim Tjernlund
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