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c.f. bug 424647
List Archive: gentoo-dev
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To: Sven Vermeulen <swift@g.o>, gentoo-dev@g.o
From: Werner Van Belle <werner.van.belle@...>
Subject: Re: -fbranch-probabilities optimisation
Date: Sat, 17 May 2003 08:33:30 +0200
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On Saturday 17 May 2003 13:43, Sven Vermeulen wrote:
> On Sat, May 17, 2003 at 03:49:11AM +0100, Chris Davies wrote:
> > I had the idea to build -fbranch-probabilities optimisation into portage.
> > This is where a sample run of data is taken using the program compiled
> > with -fprofile-arcs, and that data then used to reorganise the object
> > code so conditional branches are layed out in a more efficient manner.
>
> Why implement it in Portage? Isn't it up to the user to define it in the
> CFLAGS or not?

This won't be possible because if you want this optimisation you have:

a) To compile the program with -fprofile-arcs
b) Run the program
c) Recompile the program with the same optimisations but with 
- -fbranch-probabilities

- --
Werner,-
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Re: -fbranch-probabilities optimisation
-- Sven Vermeulen
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-- Chris Davies
Re: -fbranch-probabilities optimisation
-- Sven Vermeulen
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Updated Jun 17, 2009

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