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


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?


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