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From: David Howells <dhowells@redhat.com>
To: Geert Uytterhoeven <Geert.Uytterhoeven@sonycom.com>
Cc: dhowells@redhat.com, Adrian Bunk <bunk@kernel.org>,
	Roel Kluin <12o3l@tiscali.nl>,
	lkml <linux-kernel@vger.kernel.org>,
	cbe-oss-dev@ozlabs.org, linuxppc-dev@ozlabs.org,
	Willy Tarreau <w@1wt.eu>, Arjan van de Ven <arjan@infradead.org>
Subject: Re: [PATCH 1/3] Fix Unlikely(x) == y
Date: Mon, 18 Feb 2008 14:27:10 +0000	[thread overview]
Message-ID: <12131.1203344830@redhat.com> (raw)
In-Reply-To: <Pine.LNX.4.64.0802181500410.13406@vixen.sonytel.be>

Geert Uytterhoeven <Geert.Uytterhoeven@sonycom.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

  parent reply	other threads:[~2008-02-18 14:28 UTC|newest]

Thread overview: 34+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2008-02-16 16:08 Roel Kluin
2008-02-16 17:25 ` Arjan van de Ven
2008-02-16 17:33   ` Willy Tarreau
2008-02-16 17:42     ` Arjan van de Ven
2008-02-16 17:58       ` Willy Tarreau
2008-02-16 18:29         ` Arjan van de Ven
2008-02-17  9:45         ` [Cbe-oss-dev] " Andrew Pinski
2008-02-17 10:08           ` Willy Tarreau
2008-02-16 18:31       ` Geoff Levand
2008-02-16 18:39         ` Arjan van de Ven
2008-02-17 11:50           ` Michael Ellerman
2008-02-18 13:56             ` Adrian Bunk
2008-02-18 14:01               ` Geert Uytterhoeven
2008-02-18 14:13                 ` Adrian Bunk
2008-02-18 21:46                   ` Michael Ellerman
2008-02-19  7:43                     ` Adrian Bunk
2008-02-18 19:22                 ` [Cbe-oss-dev] " Andrew Pinski
2008-02-18 14:27               ` David Howells [this message]
2008-02-18 14:59                 ` Roel Kluin
2008-02-18 18:11                 ` Valdis.Kletnieks
2008-02-18 18:33                   ` Arjan van de Ven
2008-02-18 14:39       ` Andi Kleen
2008-02-19  2:33         ` Nick Piggin
2008-02-19  2:40           ` Arjan van de Ven
2008-02-19  4:41             ` Nick Piggin
2008-02-19  5:58           ` Willy Tarreau
2008-02-19  6:20             ` Nick Piggin
2008-02-19  9:28             ` Andi Kleen
2008-02-20  7:32               ` Willy Tarreau
2008-02-19  9:25           ` Andi Kleen
2008-02-19  9:46             ` Nick Piggin
2008-02-19  9:57               ` Andi Kleen
2008-02-19 22:25                 ` Nick Piggin
2008-02-16 18:41 ` Geoff Levand

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