lkml.org 
[lkml]   [2008]   [Feb]   [18]   [last100]   RSS Feed
Views: [wrap][no wrap]   [headers]  [forward] 
 
Messages in this thread
/
Date
From
SubjectRe: [Cbe-oss-dev] [PATCH 1/3] Fix Unlikely(x) == y
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


\
 
 \ /
  Last update: 2008-02-18 20:25    [from the cache]
©2003-2011 Jasper Spaans