[Bug tree-optimization/41101] [4.4/4.5 Regression] ICE in compute_antic, at tree-ssa-pre.c:2419

["rguenther at suse dot de" <gcc-bugzilla@gcc.gnu.org>]

------- Comment #15 from rguenther at suse dot de  2009-09-06 14:17 -------
Subject: Re:  [4.4/4.5 Regression] ICE in
 compute_antic, at tree-ssa-pre.c:2419

On Sun, 6 Sep 2009, dberlin at dberlin dot org wrote:

> 
> 
> ------- Comment #14 from dberlin at gcc dot gnu dot org  2009-09-06 14:15 -------
> Subject: Re:  [4.4/4.5 Regression] ICE in 
>         compute_antic, at tree-ssa-pre.c:2419
> 
> On Sun, Sep 6, 2009 at 8:41 AM, rguenth at gcc dot gnu dot
> org<gcc-bugzilla@gcc.gnu.org> wrote:
> >
> >
> > ------- Comment #12 from rguenth at gcc dot gnu dot org ?2009-09-06 12:41 -------
> > This is what I am thinking of:
> 
> Think harder ;)
> 
> The maximal set is the initialization vector for this problem.
> If we were using sbitmaps, it would be the equivalent of all ones.
> 
> Adding more things to it in the middle of the problem can't possibly be right.

Of course ;)  It was just to illustrate the problem that
maximal_set U ANTIC_IN != maximal_set, thus maximal_set isn't all ones
but there are zeros for some expressions in ANTIC_IN.

Richard.


-- 


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