linux-kernel - Re: kernel + gcc 4.1 = several problems

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Message-ID: <20070103142839.311717f2@localhost.localdomain>
Date:	Wed, 3 Jan 2007 14:28:39 +0000
From:	Alan <alan@...rguk.ukuu.org.uk>
To:	Arjan van de Ven <arjan@...radead.org>
Cc:	Grzegorz Kulewski <kangur@...com.net>,
	Mikael Pettersson <mikpe@...uu.se>, s0348365@....ed.ac.uk,
	torvalds@...l.org, 76306.1226@...puserve.com, akpm@...l.org,
	bunk@...sta.de, greg@...ah.com, linux-kernel@...r.kernel.org,
	yanmin_zhang@...ux.intel.com
Subject: Re: kernel + gcc 4.1 = several problems

> cmov is effectively the same cost as a compare and jump, in both cases
> the cpu needs to do a prediction, and on a mispredict, restart.

On a P4 it appears to be slower than compare/jump in most cases

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