From: Benjamin Herrenschmidt <benh@kernel.crashing.org>
To: Chris Friesen <cfriesen@nortel.com>
Cc: linuxppc-dev list <linuxppc-dev@ozlabs.org>
Subject: Re: question on inline assembly and long long values
Date: Thu, 07 Apr 2005 09:57:03 +1000 [thread overview]
Message-ID: <1112831823.9568.219.camel@gaston> (raw)
In-Reply-To: <4254771B.2070802@nortel.com>
On Wed, 2005-04-06 at 17:56 -0600, Chris Friesen wrote:
> Benjamin Herrenschmidt wrote:
>
> > But the kernel code always runs in 64 bits mode...
>
> The ppc kernel (not ppc64) runs in 64-bit mode? An unsigned long long
> fits in a single register in C code?
Ah no, it doesn't, but then, be careful to have interrupts off when you
do that are the interrupt handler won't save the high half of the
registers between the mtmsrd and your "splitting" of it.
> Yeah, the optimisations really don't matter much...the ugly resulting
> code just bothered me.
>
> Chris
--
Benjamin Herrenschmidt <benh@kernel.crashing.org>
next prev parent reply other threads:[~2005-04-06 23:57 UTC|newest]
Thread overview: 11+ messages / expand[flat|nested] mbox.gz Atom feed top
2005-04-06 18:26 question on inline assembly and long long values Chris Friesen
2005-04-06 19:16 ` Kumar Gala
2005-04-06 20:01 ` Chris Friesen
2005-04-06 21:18 ` Gabriel Paubert
2005-04-06 21:37 ` Chris Friesen
2005-04-06 23:19 ` Benjamin Herrenschmidt
2005-04-06 23:30 ` Chris Friesen
2005-04-06 23:49 ` Benjamin Herrenschmidt
2005-04-06 23:56 ` Chris Friesen
2005-04-06 23:57 ` Benjamin Herrenschmidt [this message]
2005-04-07 0:09 ` Chris Friesen
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