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

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Message-ID: <12131.1203344830@redhat.com>
Date:	Mon, 18 Feb 2008 14:27:10 +0000
From:	David Howells <dhowells@...hat.com>
To:	Geert Uytterhoeven <Geert.Uytterhoeven@...ycom.com>
Cc:	dhowells@...hat.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

Geert Uytterhoeven <Geert.Uytterhoeven@...ycom.com> wrote:

> Hence shouldn't we ask the gcc people what's the purpose of
> __builtin_expect(), if it doesn't live up to its promise?

__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.

David
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