From: "H. Peter Anvin" <hpa@zytor.com>
To: Rogier Wolff <R.E.Wolff@BitWizard.nl>
Cc: linux-kernel@vger.kernel.org
Subject: Re: [patch 4/21] fix ARCH_HAS_PREFETCH
Date: Wed, 14 Aug 2002 12:41:04 -0700 [thread overview]
Message-ID: <3D5AB250.3070104@zytor.com> (raw)
In-Reply-To: 20020814194019.A31761@bitwizard.nl
Rogier Wolff wrote:
>>
>>Bullsh*t. It can legitimately transform it into:
>>
>> i = N;
>
>
> Right! But people are confusing "practise", "published interface", and
> "spec" again.
>
> Published interface in this case is that gcc will not optimize an empty
> loop away, as it is often used to generate a timing loop.
>
Yes. This is a gcc-specific wart, a bad idea from the start, and
apparently one which has caught up with them to the point that they've
had to abandon it.
-hpa
next prev parent reply other threads:[~2002-08-14 19:37 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
2002-08-14 17:40 ` Rogier Wolff
2002-08-14 19:41 ` H. Peter Anvin [this message]
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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