[Bug middle-end/54146] Very slow compile with attribute((flatten))

[rguenther at suse dot de]

http://gcc.gnu.org/bugzilla/show_bug.cgi?id=54146

--- Comment #56 from rguenther at suse dot de <rguenther at suse dot de> 2012-08-21 07:55:14 UTC ---
On Mon, 20 Aug 2012, steven at gcc dot gnu.org wrote:

> http://gcc.gnu.org/bugzilla/show_bug.cgi?id=54146
> 
> Steven Bosscher <steven at gcc dot gnu.org> changed:
> 
>            What    |Removed                     |Added
> ----------------------------------------------------------------------------
>              Status|NEW                         |RESOLVED
>          Resolution|                            |WONTFIX
> 
> --- Comment #55 from Steven Bosscher <steven at gcc dot gnu.org> 2012-08-20 19:30:34 UTC ---
> The remaining problem areas are all liveness calculation routines that are
> essentially inherent quadratic problems: DF liveness, IRA liveness, and
> out-of-SSA liveness. 
> 
> I think it would be good to deprecate the flatten attribute...

It still can be useful I think, if only for creating testcases
with arbitrary large functions ;)