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

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Message-Id: <200701271736.30271.pluto@agmk.net>
Date:	Sat, 27 Jan 2007 17:36:30 +0100
From:	Paweł Sikora <pluto@...k.net>
To:	linux-kernel@...r.kernel.org
Cc:	Avi Kivity <avi@...ranet.com>, caglar@...dus.org.tr,
	kvm-devel@...ts.sourceforge.net
Subject: Re: [PATCH] KVM: 'asm' operand has impossible constraints

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 ).
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