From: Andreas Schwab <schwab@suse.de>
To: "J. Bruce Fields" <bfields@fieldses.org>
Cc: Davide Libenzi <davidel@xmailserver.org>,
Ingo Molnar <mingo@elte.hu>, Jeff Garzik <jgarzik@pobox.com>,
Greg KH <greg@kroah.com>, Andrew Morton <akpm@osdl.org>,
Linux Kernel Mailing List <linux-kernel@vger.kernel.org>,
Netdev <netdev@oss.sgi.com>
Subject: Re: MSEC_TO_JIFFIES is messed up...
Date: Wed, 12 May 2004 23:55:18 +0200 [thread overview]
Message-ID: <jevfj1nwe1.fsf@sykes.suse.de> (raw)
In-Reply-To: <20040512213913.GA16658@fieldses.org> (J. Bruce Fields's message of "Wed, 12 May 2004 17:39:13 -0400")
"J. Bruce Fields" <bfields@fieldses.org> writes:
> If gcc really optimizes that to just the identity function, then surely
> that's a gcc bug? Multiplication is left-associative, so i * 1000 /
> 1000 = (i * 1000) / 1000, but (i * 1000) should be zero for any i
> divisible by i^(sizeof(int) - 12).
Signed integer overflow is undefined in C, so the compiler is allowed to
assume it does not happen.
Andreas.
--
Andreas Schwab, SuSE Labs, schwab@suse.de
SuSE Linux AG, Maxfeldstraße 5, 90409 Nürnberg, Germany
Key fingerprint = 58CA 54C7 6D53 942B 1756 01D3 44D5 214B 8276 4ED5
"And now for something completely different."
next prev parent reply other threads:[~2004-05-12 21:56 UTC|newest]
Thread overview: 54+ messages / expand[flat|nested] mbox.gz Atom feed top
[not found] <20040512020700.6f6aa61f.akpm@osdl.org>
2004-05-12 18:19 ` MSEC_TO_JIFFIES is messed up Greg KH
2004-05-12 18:42 ` Jeff Garzik
2004-05-12 19:33 ` Ingo Molnar
2004-05-12 19:47 ` Valdis.Kletnieks
2004-05-12 19:56 ` Davide Libenzi
2004-05-12 20:07 ` Valdis.Kletnieks
2004-05-12 20:28 ` Ingo Molnar
2004-05-12 20:35 ` Ingo Molnar
2004-05-12 20:50 ` Ingo Molnar
2004-05-12 21:03 ` Valdis.Kletnieks
2004-05-12 21:33 ` Davide Libenzi
2004-05-12 21:07 ` Andrew Morton
2004-05-12 21:17 ` Ingo Molnar
2004-05-12 22:18 ` William Lee Irwin III
2004-05-13 17:38 ` Paul Wagland
2004-05-13 19:11 ` Andrew Morton
2004-05-13 19:19 ` Jeff Garzik
2004-05-13 22:40 ` Andrew Morton
2004-05-13 22:40 ` Andrew Morton
2004-05-13 22:41 ` Andrew Morton
2004-05-13 23:02 ` Jeff Garzik
2004-05-13 19:50 ` Paul Wagland
2004-05-12 23:33 ` Peter Williams
2004-05-12 19:49 ` Davide Libenzi
2004-05-12 20:03 ` Ingo Molnar
2004-05-12 20:18 ` Valdis.Kletnieks
2004-05-12 20:20 ` Andrew Morton
2004-05-12 20:24 ` Jeff Garzik
2004-05-12 20:35 ` Andrew Morton
2004-05-12 20:44 ` Jeff Garzik
2004-05-12 21:03 ` Sridhar Samudrala
2004-05-12 20:32 ` Greg KH
2004-05-12 20:38 ` William Lee Irwin III
2004-05-12 20:47 ` Andrew Morton
2004-05-12 20:58 ` Jeff Garzik
2004-05-12 20:59 ` William Lee Irwin III
2004-05-12 20:55 ` Ingo Molnar
2004-05-12 21:01 ` Davide Libenzi
2004-05-12 21:12 ` Ingo Molnar
2004-05-12 21:40 ` Davide Libenzi
2004-05-12 21:49 ` Zan Lynx
2004-05-12 22:05 ` Roland Dreier
2004-05-12 21:56 ` Zan Lynx
2004-05-12 21:39 ` J. Bruce Fields
2004-05-12 21:55 ` Andreas Schwab [this message]
2004-05-12 22:07 ` J. Bruce Fields
2004-05-16 3:48 ` Chris Wedgwood
2004-05-16 12:10 ` Paul Wagland
2004-05-12 20:17 ` Jeff Garzik
2004-05-12 20:54 ` Bill Rugolsky Jr.
2004-05-12 22:44 ` Bill Rugolsky Jr.
2004-05-12 20:40 Jan Olderdissen
2004-05-12 20:46 ` Jeff Garzik
2004-05-12 20:49 ` Andreas Schwab
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