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From: "Andrew Pinski" <pinskia@gmail.com>
To: "Geert Uytterhoeven" <Geert.Uytterhoeven@sonycom.com>
Cc: "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: [Cbe-oss-dev] [PATCH 1/3] Fix Unlikely(x) == y
Date: Mon, 18 Feb 2008 11:22:18 -0800	[thread overview]
Message-ID: <de8d50360802181122k63410760y9a61f4c42ff251f8@mail.gmail.com> (raw)
In-Reply-To: <Pine.LNX.4.64.0802181500410.13406@vixen.sonytel.be>

On Feb 18, 2008 6:01 AM, Geert Uytterhoeven
<Geert.Uytterhoeven@sonycom.com> wrote:
> > This means it generates faster code with a current gcc for your platform.
> >
> > But a future gcc might e.g. replace the whole loop with a division
> > (gcc SVN head (that will soon become gcc 4.3) already does
> > transformations like replacing loops with divisions [1]).

Yes but the issue is one optimization inside GCC does not take into
account the probability in one case.

And really there is a bug in the linux kernel for not implementing the
long long divide function (or really using libgcc) but that is a
different story and is part of the issue there anyways.

-- Pinski

  parent reply	other threads:[~2008-02-18 19:22 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                 ` Andrew Pinski [this message]
2008-02-18 14:27               ` David Howells
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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