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From: Avi Kivity <>
Cc: lkml <>,
Subject: Re: [PATCH] KVM: 'asm' operand has impossible constraints
Date: Sun, 28 Jan 2007 11:45:09 +0200	[thread overview]
Message-ID: <> (raw)
In-Reply-To: <>

S.Çağlar Onur wrote:
> 27 Oca 2007 Cts tarihinde, Avi Kivity şunları yazmıştı: 
>> The patch looks correct, but I don't understand the gcc error message.
>> Are we sure this isn't a gcc 4.2 bug?
>> "g" appears to be equivalent to "rmi", if "i" is impossible, gcc is free
>> to use "r" or "m", no?
> Accorgind to GCC devs. its not a bug 
> (, on comment #5 the 
> problem described like;
> "g" means "r"+"i" so the register allocator in the -O0 case is selecting "r" 
> while in the optimize case is selecting "i"

That's a different bug. The gcc PR has an assembler error message, as 
expected, whereas the kvm miscompile has a compiler error, which I don't 

Anyhow, your patch is correct (because selecting "i" is indeed 
erroneous) so I'll apply it, but I'm worried that there's a gcc bug in 
there that we ought to report.

error compiling committee.c: too many arguments to function

      parent reply	other threads:[~2007-01-28  9:45 UTC|newest]

Thread overview: 8+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2007-01-25 23:40 S.Çağlar Onur
2007-01-27  9:05 ` Avi Kivity
2007-01-27 16:36   ` Paweł Sikora
2007-01-28  9:41     ` Avi Kivity
2007-01-27 21:28   ` S.Çağlar Onur
2007-01-27 21:46     ` D. Hazelton
2007-01-28  7:55     ` H. Peter Anvin
2007-01-28  9:45     ` Avi Kivity [this message]

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