linux-kernel - Re: if (unlikely(...)) == unnecessary?

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Message-ID: <18816.47047.304831.827133@harpo.it.uu.se>
Date:	Wed, 28 Jan 2009 20:53:43 +0100
From:	Mikael Pettersson <mikpe@...uu.se>
To:	Davide Libenzi <davidel@...ilserver.org>
Cc:	Linux Kernel Mailing List <linux-kernel@...r.kernel.org>
Subject: Re: if (unlikely(...)) == unnecessary?

Davide Libenzi writes:
 > I noticed that GCC >= 3.3 (not tried the ones before) automatically 
 > branches out the "if" code (and follow-through the "else" code, if there). 
 > Is that a coincidence or a rule we can rely on going forward?

Coincidence.

Why on earth would you want to rely on an purely private implementation
detail like that?
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