From: Arjan van de Ven <arjan@infradead.org>
To: Denis Vlasenko <vda@ilport.com.ua>
Cc: Pekka J Enberg <penberg@cs.Helsinki.FI>,
Adrian Bunk <bunk@stusta.de>, Andrew Morton <akpm@osdl.org>,
linux-kernel@vger.kernel.org
Subject: Re: [-mm patch] make kcalloc() a static inline
Date: Mon, 15 Aug 2005 11:41:57 +0200 [thread overview]
Message-ID: <1124098918.3228.25.camel@laptopd505.fenrus.org> (raw)
In-Reply-To: <200508151233.46523.vda@ilport.com.ua>
On Mon, 2005-08-15 at 12:33 +0300, Denis Vlasenko wrote:
> gcc can optimize that away with non-const n?! I don't think so.
due to the wonders of "value range propagation" it actually can, if the
check is done sufficiently before...
gcc keeps track of the range a variable can have at each point, so if
the check is done before, the "possible range" will be such that the
divide should be optimizable.
(Note: this is a relatively new feature in gcc though)
next prev parent reply other threads:[~2005-08-15 9:42 UTC|newest]
Thread overview: 13+ messages / expand[flat|nested] mbox.gz Atom feed top
2005-08-08 22:38 Adrian Bunk
2005-08-09 5:09 ` Pekka J Enberg
2005-08-15 8:06 ` [-mm patch] " Denis Vlasenko
2005-08-15 8:14 ` Arjan van de Ven
2005-08-15 8:20 ` Denis Vlasenko
2005-08-15 8:28 ` Pekka J Enberg
2005-08-15 9:33 ` Denis Vlasenko
2005-08-15 9:41 ` Arjan van de Ven [this message]
2005-08-15 12:17 ` Denis Vlasenko
2005-08-15 12:25 ` Arjan van de Ven
2005-08-15 13:06 ` Pekka J Enberg
2005-08-15 13:51 ` Alan Cox
2005-08-15 16:30 ` Adrian Bunk
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