Re: [tree-ssa] cfg_remove_useless_stmts

[Zdenek Dvorak <rakdver at atrey dot karlin dot mff dot cuni dot cz>]

Hello,

>  >> I see... no direct ideas how to deal it more generally then.
>  >> > > THis can be executed only for COND_EXPRs where both arms get nullified,
>  >> > > right? This should be cared of by cfg_cleanup unless something is wrong
>  >> > > with it.
>  >> > 
>  >> > Yes it could; no it is not, since cfg_cleanup is not run after un-ssa.
>  >> 
>  >> It would be nice to unify these two somehow.  I will try to look into it
>  >> later.  Some of the issues should be dealt with if we get rid of GOTOs
>  >> completely that should not take that long anyway.
>  >
>  >indeed; with the patch to do it I am currently testing all the goto
>  >removal stuff goes away.
> I'd *strongly* recommend you examine the .optimized and .rtl dumps if
> you go down this path.  The goto removal stuff is still eliminating
> a lot of crap.  If you pull it out, I strongly suspect you'll find that
> you're suddenly generating a lot more jumps when you drop down from
> tree to rtl form.

why?  With my patch, I do not generate any unnecesary gotos at all in
the first place.

Zdenek