linux-kernel - Re: Inline assembly queries [2]

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Message-ID: <m2vdm9cvlu.fsf@igel.home>
Date:	Fri, 03 Jul 2009 23:19:57 +0200
From:	Andreas Schwab <schwab@...ux-m68k.org>
To:	kernel mailz <kernelmailz@...glemail.com>
Cc:	Brad Boyer <flar@...andria.com>, linuxppc-dev@...abs.org,
	gcc-help@....gnu.org, linux-kernel@...r.kernel.org
Subject: Re: Inline assembly queries [2]

kernel mailz <kernelmailz@...glemail.com> writes:

> My query was more on %U1%X1, I guess it is specifying U and/or X for %1 right ?
> what does U/X stand for (is it similar to u - unsigned and x for a hex address)
> are there any more literals like U/X/...

The 'U' and 'X' modifiers expand to 'u' and 'x' resp, depending on the
form of the referenced memory operand.  That allows one to select the
right mnemonic among for example lwz, lwzu, lwzx and lwzux.  Those
modifiers must always be used together with the "m" constraint.

Andreas.

-- 
Andreas Schwab, schwab@...ux-m68k.org
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