* Re: [gentoo-dev] -fbranch-probabilities optimisation
@ 2003-05-17 6:33 99% ` Werner Van Belle
0 siblings, 0 replies; 1+ results
From: Werner Van Belle @ 2003-05-17 6:33 UTC (permalink / raw
To: Sven Vermeulen, gentoo-dev
-----BEGIN PGP SIGNED MESSAGE-----
Hash: SHA1
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,-
-----BEGIN PGP SIGNATURE-----
Version: GnuPG v1.2.1 (GNU/Linux)
iD8DBQE+xde8xiU3uL/NdUYRAiP6AJ0QjEGvQS4QdmjIbQc5GkyILTjp5wCfSQQM
5uusj7sl82+ITMRc9xcEaD4=
=eiol
-----END PGP SIGNATURE-----
--
gentoo-dev@gentoo.org mailing list
^ permalink raw reply [relevance 99%]
Results 1-1 of 1 | reverse | options above
-- pct% links below jump to the message on this page, permalinks otherwise --
2003-05-17 2:49 [gentoo-dev] -fbranch-probabilities optimisation Chris Davies
2003-05-17 11:43 ` Sven Vermeulen
2003-05-17 6:33 99% ` Werner Van Belle
This is a public inbox, see mirroring instructions
for how to clone and mirror all data and code used for this inbox