Messages in this thread | | | Date | Mon, 18 Feb 2008 11:22:18 -0800 | From | "Andrew Pinski" <> | Subject | Re: [Cbe-oss-dev] [PATCH 1/3] Fix Unlikely(x) == y |
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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
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