[Bug tree-optimization/64728] [5 Regression] internal compiler error: SSA corruption

[rguenther at suse dot de]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=64728

--- Comment #7 from rguenther at suse dot de <rguenther at suse dot de> ---
On Thu, 22 Jan 2015, jakub at gcc dot gnu.org wrote:

> https://gcc.gnu.org/bugzilla/show_bug.cgi?id=64728
> 
> --- Comment #6 from Jakub Jelinek <jakub at gcc dot gnu.org> ---
> (In reply to Richard Biener from comment #5)
> > Index: tree-ssa-coalesce.c
> > ===================================================================
> > --- tree-ssa-coalesce.c (revision 219989)
> > +++ tree-ssa-coalesce.c (working copy)
> > @@ -1213,8 +1215,11 @@ coalesce_partitions (var_map map, ssa_co
> >                  gsi_next (&gsi))
> >               {
> >                 gphi *phi = gsi.phi ();
> > -               tree res = PHI_RESULT (phi);
> >                 tree arg = PHI_ARG_DEF (phi, e->dest_idx);
> > +               if (SSA_NAME_IS_DEFAULT_DEF (arg))
> > +                 continue;
> > +
> > +               tree res = PHI_RESULT (phi);
> >                 int v1 = SSA_NAME_VERSION (res);
> >                 int v2 = SSA_NAME_VERSION (arg);
> >  
> > 
> > fixes it for me.
> 
> Is that right even when SSA_NAME_VAR is a PARM_DECL?

No, of course not.

> 
>