[Bug target/71733] ICE in vmx test cases with -mcpu=power9

[bergner at gcc dot gnu.org]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=71733

--- Comment #4 from Peter Bergner <bergner at gcc dot gnu.org> ---
Aaron, the following patch seems to fix the problem for me.  Can you give this
a try?
I'm currently bootstraapping and regtesting it.


Index: gcc/config/rs6000/rs6000.c
===================================================================
--- gcc/config/rs6000/rs6000.c  (revision 237929)
+++ gcc/config/rs6000/rs6000.c  (working copy)
@@ -4303,7 +4303,8 @@ rs6000_option_override_internal (bool gl
     {
       if (rs6000_isa_flags_explicit & OPTION_MASK_P8_VECTOR)
        error ("-mpower9-vector requires -mpower8-vector");
-      rs6000_isa_flags &= ~OPTION_MASK_P9_VECTOR;
+      rs6000_isa_flags &= ~(OPTION_MASK_P9_VECTOR
+                           | OPTION_MASK_P9_DFORM_VECTOR);
     }

   /* There have been bugs with -mvsx-timode that don't show up with -mlra,