linux-kernel - Re: [PATCH 1/3] Fix Unlikely(x) == y

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Date:	Mon, 18 Feb 2008 13:11:06 -0500
From:	Valdis.Kletnieks@...edu
To:	David Howells <dhowells@...hat.com>
Cc:	Geert Uytterhoeven <Geert.Uytterhoeven@...ycom.com>,
	Adrian Bunk <bunk@...nel.org>, Roel Kluin <12o3l@...cali.nl>,
	lkml <linux-kernel@...r.kernel.org>, cbe-oss-dev@...abs.org,
	linuxppc-dev@...abs.org, Willy Tarreau <w@....eu>,
	Arjan van de Ven <arjan@...radead.org>
Subject: Re: [PATCH 1/3] Fix Unlikely(x) == y

On Mon, 18 Feb 2008 14:27:10 GMT, David Howells said:

> __builtin_expect() is useful on FRV where you _have_ to give each branch and
> conditional branch instruction a measure of probability whether the branch
> will be taken.

What does gcc do the 99.998% of the time we don't have likely/unlikely coded?

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