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From: "H. Peter Anvin" <hpa@zytor.com>
To: Adrian Bunk <bunk@fs.tum.de>
Cc: linux-kernel@vger.kernel.org
Subject: Re: [patch 4/21] fix ARCH_HAS_PREFETCH
Date: Tue, 13 Aug 2002 15:42:05 -0700	[thread overview]
Message-ID: <3D598B3D.8050006@zytor.com> (raw)
In-Reply-To: Pine.NEB.4.44.0208140020260.1351-100000@mimas.fachschaften.tu-muenchen.de

Adrian Bunk wrote:
> 
> Ah, my misunderstanding:
> "optimize away" didn't mean "completely remove it" but "transform it to
> something semantically equivalent".
> 

The thing is that gcc has a special rule that keeps it from optimizing
it into something with less than O(n) time.

	-=hpa



  reply	other threads:[~2002-08-13 22:38 UTC|newest]

Thread overview: 27+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2002-08-11  7:38 [patch 4/21] fix ARCH_HAS_PREFETCH Andrew Morton
2002-08-11 19:49 ` Alan Cox
2002-08-11 18:47   ` Andrew Morton
2002-08-11 18:46     ` Larry McVoy
2002-08-11 19:06     ` Linus Torvalds
2002-08-11 20:07       ` GCC still keeps empty loops? (was: [patch 4/21] fix ARCH_HAS_PREFETCH) Jamie Lokier
2002-08-12  7:45         ` Ralf Baechle
2002-08-13 21:42     ` [patch 4/21] fix ARCH_HAS_PREFETCH Adrian Bunk
2002-08-13 22:12       ` H. Peter Anvin
2002-08-13 22:22         ` Adrian Bunk
2002-08-13 22:42           ` H. Peter Anvin [this message]
2002-08-14 17:40         ` Rogier Wolff
2002-08-14 19:41           ` H. Peter Anvin
2002-08-14 19:57             ` Jamie Lokier
2002-08-14 22:03               ` Daniel Jacobowitz
2002-08-14 20:45             ` Willy Tarreau
2002-08-14 20:58               ` H. Peter Anvin
2002-08-14 21:11                 ` Willy Tarreau
2002-08-14 21:13                   ` H. Peter Anvin
2002-08-15  1:23                 ` Alan Cox
2002-08-15  1:28                   ` H. Peter Anvin
2002-08-15  1:37                     ` Alan Cox
2002-08-14 22:53               ` David Lang
2002-08-14 23:31                 ` Jamie Lokier
2002-08-15  6:44                 ` Willy Tarreau
2002-08-15  6:55                   ` H. Peter Anvin
     [not found] <3D56147E.15E7A98@zip.com.au.suse.lists.linux.kernel>
2002-08-11  9:53 ` Andi Kleen

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