linux-kernel - Re: [PATCH] KVM: 'asm' operand has impossible constraints

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Message-ID: <45BC6FDC.5050208@qumranet.com>
Date:	Sun, 28 Jan 2007 11:41:48 +0200
From:	Avi Kivity <avi@...ranet.com>
To:	Paweł Sikora <pluto@...k.net>
CC:	linux-kernel@...r.kernel.org, caglar@...dus.org.tr,
	kvm-devel@...ts.sourceforge.net
Subject: Re: [PATCH] KVM: 'asm' operand has impossible constraints

Paweł Sikora wrote:
> On Saturday 27 of January 2007 10:05:53 Avi Kivity wrote:
>
>   
>> "g" appears to be equivalent to "rmi", if "i" is impossible, gcc is free
>> to use "r" or "m", no?
>>     
>
> `r'
>      A register operand is allowed provided that it is in a general
>      register.
> `g'
>      Any register, memory or immediate integer operand is allowed,
>      except for registers that are not general registers.
>
> so, it looks like g == !r for registers ( not general vs. general regs ).
>   

I read it as g == !!r for registers ("except" and "not" constitute a 
double negative).


-- 
error compiling committee.c: too many arguments to function

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