[Bug tree-optimization/85478] ICE with single element vector

[rguenth at gcc dot gnu.org]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=85478

Richard Biener <rguenth at gcc dot gnu.org> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
             Status|UNCONFIRMED                 |NEW
   Last reconfirmed|                            |2018-04-23
                 CC|                            |rsandifo at gcc dot gnu.org
     Ever confirmed|0                           |1

--- Comment #9 from Richard Biener <rguenth at gcc dot gnu.org> ---
Ok, confirmed.  The following fixes it:

Index: gcc/tree-vect-loop.c
===================================================================
--- gcc/tree-vect-loop.c        (revision 259558)
+++ gcc/tree-vect-loop.c        (working copy)
@@ -2492,6 +2492,7 @@ again:
       unsigned int size = STMT_VINFO_GROUP_SIZE (vinfo);
       tree vectype = STMT_VINFO_VECTYPE (vinfo);
       if (! vect_store_lanes_supported (vectype, size, false)
+         && ! known_eq (TYPE_VECTOR_SUBPARTS (vectype), 1U)
          && ! vect_grouped_store_supported (vectype, size))
        return false;
       FOR_EACH_VEC_ELT (SLP_INSTANCE_LOADS (instance), j, node)

Andreas, can you test this?  It's pre-approved if you make it before RC1.