------- 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-bugzi...@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. -- http://gcc.gnu.org/bugzilla/show_bug.cgi?id=41101
