From: Holger Bettag <hobold@Informatik.Uni-Bremen.DE>
To: linuxppc-dev@lists.linuxppc.org
Subject: Re: is gcc optimized for g4 processors ?
Date: 02 Feb 2000 18:33:45 +0100 [thread overview]
Message-ID: <8xpuuf33wm.fsf@s62.informatik.uni-bremen.de> (raw)
In-Reply-To: Stephane GEORGES's message of Wed, 02 Feb 2000 18:01:02 +0100
Stephane GEORGES <sg@dalim.de> writes:
>
>
> I'm doing performance tests on my G4 - 400 AGP.
> I would like to know if gcc (egcs-2.91.66) can be optimized for G4 processor.
>
> Does -mcpu=7400 exists ?
>
I don't think the option is in there yet. But -mcpu=604e should fit the 7400
quite well, for both integer and floating point code. The only big scheduling
difference would be for integer multiplications.
(The 604e has a separate, pipelined integer multiplier, while the 7400's is
non-pipelined and blocks one of the integer units, but has an early-exit-
capability if one the factors has less than 32 significant bits.)
Holger
** Sent via the linuxppc-dev mail list. See http://lists.linuxppc.org/
next prev parent reply other threads:[~2000-02-02 17:33 UTC|newest]
Thread overview: 4+ messages / expand[flat|nested] mbox.gz Atom feed top
[not found] <8EC5DD61D2E46E3CC125687900528BB1.00528C13C1256879@kehl.dalim.de>
2000-02-02 17:01 ` is gcc optimized for g4 processors ? Stephane GEORGES
2000-02-02 17:33 ` Holger Bettag [this message]
2000-02-02 17:36 ` René Pachernegg
2000-02-02 17:38 ` David Edelsohn
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