From: David Edelsohn <dje@watson.ibm.com>
To: Gabriel Paubert <paubert@iram.es>
Cc: Kevin Hendricks <khendricks@ivey.uwo.ca>,
linuxppc-dev@lists.linuxppc.org
Subject: Re: Fwd: Re: still no accelerated X ($#!$*)
Date: Thu, 20 Jan 2000 15:08:59 -0500 [thread overview]
Message-ID: <200001202009.PAA26168@mal-ach.watson.ibm.com> (raw)
In-Reply-To: Message from Gabriel Paubert <paubert@iram.es> of "Thu, 20 Jan 2000 20:59:06 +0100." <Pine.HPX.4.10.10001202043560.18916-100000@gra-ux1.iram.es>
>>>>> Gabriel Paubert writes:
Gabriel> I think that it is not necessary: the best thing with a compiler which
Gabriel> performs alias analysis might be to tell the truth
Gabriel> asm ("stwbrx %1,%2,%3"
Gabriel> : "=m" (*(volatile unsigned *)(base_addr+regindex))
Gabriel> : "r" (regdata), "b" (base_addr), "r" (regindex));
Gabriel> Note we don't use %0, and it won't produce any aditional code. You may
Gabriel> want to check what the compiler would have generated as addressing mode
Gabriel> by appending " # %0" at the end of the code string.
Yes, this type of inlined assembly describing the actual memory
operation as an output constraint is better than clobbering all of memory,
if possible.
David
** Sent via the linuxppc-dev mail list. See http://lists.linuxppc.org/
next prev parent reply other threads:[~2000-01-20 20:08 UTC|newest]
Thread overview: 31+ messages / expand[flat|nested] mbox.gz Atom feed top
[not found] <Message from Kevin Hendricks <khendricks@ivey.uwo.ca>
2000-01-20 18:12 ` Fwd: Re: still no accelerated X ($#!$*) Kevin Hendricks
2000-01-20 18:26 ` David Edelsohn
2000-01-20 18:45 ` Benjamin Herrenschmidt
2000-01-20 18:51 ` David Edelsohn
2000-01-20 18:52 ` Franz Sirl
2000-01-20 19:31 ` Gabriel Paubert
2000-01-20 19:36 ` Kevin Hendricks
2000-01-20 19:51 ` Geert Uytterhoeven
2000-01-20 19:59 ` Gabriel Paubert
2000-01-20 20:08 ` David Edelsohn [this message]
2000-01-20 22:34 ` Franz Sirl
2000-01-21 0:05 ` Gabriel Paubert
2000-01-21 0:35 ` Kevin Hendricks
2000-01-21 1:53 ` Gabriel Paubert
2000-01-21 2:19 ` Kevin Hendricks
2000-01-21 7:58 ` Geert Uytterhoeven
2000-01-21 14:15 ` Benjamin Herrenschmidt
2000-01-22 20:54 ` [linux-fbdev] " anthony tong
2000-01-23 2:44 ` Kevin Hendricks
2000-01-21 11:54 ` Benjamin Herrenschmidt
2000-01-21 13:34 ` Gabriel Paubert
2000-01-21 14:06 ` Benjamin Herrenschmidt
2000-01-21 15:47 ` Franz Sirl
2000-01-21 19:08 ` Gabriel Paubert
2000-01-20 18:46 ` Franz Sirl
2000-01-21 13:53 Kevin_Hendricks
[not found] <200001211355.NAA05477@granada.iram.es>
2000-01-21 15:13 ` Gabriel Paubert
2000-01-21 15:29 ` Benjamin Herrenschmidt
-- strict thread matches above, loose matches on Subject: below --
2000-01-21 17:32 David Edelsohn
2000-01-21 20:25 jlquinn
2000-01-23 13:06 ` Gabriel Paubert
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