From: Andreas Schwab <schwab@linux-m68k.org>
To: kernel mailz <kernelmailz@googlemail.com>
Cc: linuxppc-dev@ozlabs.org, linux-kernel@vger.kernel.org,
gcc-help@gcc.gnu.org
Subject: Re: Inline assembly queries [2]
Date: Fri, 03 Jul 2009 23:19:57 +0200 [thread overview]
Message-ID: <m2vdm9cvlu.fsf@igel.home> (raw)
In-Reply-To: <abe8a1fd0907031305r5cb9e2e8pec170bffb1c497ff@mail.gmail.com> (kernel mailz's message of "Sat, 4 Jul 2009 01:35:50 +0530")
kernel mailz <kernelmailz@googlemail.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@linux-m68k.org
GPG Key fingerprint = 58CA 54C7 6D53 942B 1756 01D3 44D5 214B 8276 4ED5
"And now for something completely different."
WARNING: multiple messages have this Message-ID (diff)
From: Andreas Schwab <schwab@linux-m68k.org>
To: kernel mailz <kernelmailz@googlemail.com>
Cc: Brad Boyer <flar@allandria.com>,
linuxppc-dev@ozlabs.org, gcc-help@gcc.gnu.org,
linux-kernel@vger.kernel.org
Subject: Re: Inline assembly queries [2]
Date: Fri, 03 Jul 2009 23:19:57 +0200 [thread overview]
Message-ID: <m2vdm9cvlu.fsf@igel.home> (raw)
In-Reply-To: <abe8a1fd0907031305r5cb9e2e8pec170bffb1c497ff@mail.gmail.com> (kernel mailz's message of "Sat, 4 Jul 2009 01:35:50 +0530")
kernel mailz <kernelmailz@googlemail.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@linux-m68k.org
GPG Key fingerprint = 58CA 54C7 6D53 942B 1756 01D3 44D5 214B 8276 4ED5
"And now for something completely different."
next prev parent reply other threads:[~2009-07-03 21:20 UTC|newest]
Thread overview: 15+ messages / expand[flat|nested] mbox.gz Atom feed top
2009-07-03 6:44 Inline assembly queries [2] kernel mailz
2009-07-03 17:40 ` Brad Boyer
2009-07-03 17:40 ` Brad Boyer
2009-07-03 20:05 ` kernel mailz
2009-07-03 20:05 ` kernel mailz
2009-07-03 21:19 ` Andreas Schwab [this message]
2009-07-03 21:19 ` Andreas Schwab
2009-07-03 20:57 ` Andreas Schwab
2009-07-03 20:57 ` Andreas Schwab
2009-07-06 6:56 ` Gabriel Paubert
2009-07-06 6:56 ` Gabriel Paubert
2009-07-07 12:40 ` Andreas Schwab
2009-07-07 12:40 ` Andreas Schwab
2009-07-07 13:46 ` Gabriel Paubert
2009-07-07 13:46 ` Gabriel Paubert
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