Re: [tree-ssa-cfg] BIND_EXPR removal

[Daniel Berlin <dberlin at dberlin dot org>]

> > It should not.
> > It does not on the main tree-ssa branch.
> > We specifically ggc_push_context to avoid any problems, and this
> > guarnatees the only things destroyed are those created during each
> > expression's PRE'ing.
> >
> > Any problems that you are experiencing are likely due to improper
> > marking of structures you have attached to trees, and *need* to be
> > fixed.
>
> nope, both problems I have detected should also be on mainline.

Sigh.

>  The
> first is the dom_children allocated by gc (this I fixed).  The second
> one is that dominance_info structure contains varray that is also
> allocated by gc.  Both of these cause problems when dominators are
> recomputed, since this is done after ggc_push_context.
> I will of course do the proper fix once I have a time,
> this is just a workaround to make the branch bootstrap.

I only care because PRE generates quite a bit of per-expression garbage 
that needs to be collected.   Just disabling it will cause our memory 
usage to balloon.  (It's pretty hard to avoid this, i'm working on it).

> Zdenek