From: Benjamin Herrenschmidt <benh@kernel.crashing.org>
To: Kevin Diggs <kevdig@hypersurf.com>
Cc: linuxppc-dev@ozlabs.org
Subject: Re: inline assembly & r0 SOS
Date: Wed, 06 Aug 2008 10:35:07 +1000 [thread overview]
Message-ID: <1217982907.24157.217.camel@pasglop> (raw)
In-Reply-To: <4898EE60.9080206@hypersurf.com>
On Tue, 2008-08-05 at 17:20 -0700, Kevin Diggs wrote:
> Hi,
>
> thats bad right? Because the "addi 0, 0, 23" will not work as expected
> because of the "special property" of r0. FYI: The first three lines
> after the "#APP" are from a similar function get_PLL_ratio().
>
> Is there a way to blacklist r0?
Yes. Use "b" instead of "r" in the constraints to force the compiler
to avoid r0 when assigning a register.
Cheers,
Ben.
next prev parent reply other threads:[~2008-08-06 0:35 UTC|newest]
Thread overview: 6+ messages / expand[flat|nested] mbox.gz Atom feed top
2008-08-06 0:20 inline assembly & r0 SOS Kevin Diggs
2008-08-06 0:35 ` Benjamin Herrenschmidt [this message]
2008-08-06 0:41 ` Jeremy Kerr
2008-08-06 2:31 ` Kevin Diggs
2008-08-06 8:49 ` Andreas Schwab
2008-08-06 14:39 ` Segher Boessenkool
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