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From: Alan Cox <alan@lxorguk.ukuu.org.uk>
To: etienne_lorrain@yahoo.fr (Etienne Lorrain)
Cc: linux-kernel@vger.kernel.org
Subject: Re: [PATCH] change name of rep_nop
Date: Tue, 9 Oct 2001 12:30:39 +0100 (BST)	[thread overview]
Message-ID: <E15qv5s-0003oy-00@the-village.bc.nu> (raw)
In-Reply-To: <20011009085140.85739.qmail@web11801.mail.yahoo.com> from "=?iso-8859-1?q?Etienne=20Lorrain?=" at Oct 09, 2001 10:51:40 AM

>   Hello,
> > 	__asm__ __volatile__("rep;nop");
> 
> "The behavior of the REP prefix is undefined when used with non-string
> instructions." page 3-404 of Intel documentation, in "CHAPTER 3,
> INSTRUCTION SET REFERENCE"...
> 
>   How about: __asm__ __volatile__("loop ." : "+c" (nbloop)); ?

rep nop is a magic instruction to powersave momentarily on the Pentium 4.
It happens to be a true nop on the older processors

  reply	other threads:[~2001-10-09 11:25 UTC|newest]

Thread overview: 27+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2001-10-09  8:51 Etienne Lorrain
2001-10-09 11:30 ` Alan Cox [this message]
  -- strict thread matches above, loose matches on Subject: below --
2001-10-05 10:46 Paul Mackerras
2001-10-05 14:37 ` Alan Cox
2001-10-05 18:06   ` Peter Rival
2001-10-05 23:28   ` Paul Mackerras
2001-10-05 23:54     ` Martin J. Bligh
2001-10-06  1:40     ` Paul Mackerras
2001-10-08 19:27       ` Peter Rival
2001-10-08 22:36       ` David Woodhouse
2001-10-08 22:49         ` Alan Cox
2001-10-08 23:06         ` David Woodhouse
2001-10-08 23:42           ` David Woodhouse
2001-10-08 23:46           ` David S. Miller
2001-10-08 23:08         ` David S. Miller
2001-10-08 23:46         ` Linus Torvalds
2001-10-09  0:03           ` David Woodhouse
2001-10-08 22:46       ` David S. Miller
2001-10-08 23:16         ` Alan Cox
2001-10-08 23:24           ` Dave Jones
2001-10-08 23:33             ` Alan Cox
2001-10-09  5:01             ` George Greer
2001-10-08 23:30           ` David S. Miller
2001-10-09 10:33           ` Benjamin Herrenschmidt
2001-10-09 11:30             ` Keith Owens
2001-10-09 12:13               ` Benjamin Herrenschmidt
2001-10-09 12:15               ` Alan Cox

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