re PR tree-optimization/55334 (mgrid regression (ipa-cp disables vectorization))

2013-02-20  Martin Jambor  <mjambor@suse.cz>

	PR tree-optimization/55334
	* ipa-cp.c (initialize_node_lattices): Disable IPA-CP through and to
	restricted pointers to arrays.

From-SVN: r196171

gcc/ChangeLog

+2013-02-20  Martin Jambor  <mjambor@suse.cz>
+
+	PR tree-optimization/55334
+	* ipa-cp.c (initialize_node_lattices): Disable IPA-CP through and to
+	restricted pointers to arrays.
+
 2013-02-20  Richard Biener  <rguenther@suse.de>
 	Jakub Jelinek  <jakub@redhat.com>
 

gcc/ipa-cp.c

@@ -730,6 +730,22 @@ initialize_node_lattices (struct cgraph_node *node)
 		 cgraph_node_name (node), node->uid,
 		 disable ? "BOTTOM" : "VARIABLE");
     }
+  if (!disable)
+    for (i = 0; i < ipa_get_param_count (info) ; i++)
+      {
+	struct ipcp_param_lattices *plats = ipa_get_parm_lattices (info, i);
+	tree t = TREE_TYPE (ipa_get_param(info, i));
+
+	if (POINTER_TYPE_P (t) && TYPE_RESTRICT (t)
+	    && TREE_CODE (TREE_TYPE (t)) == ARRAY_TYPE)
+	  {
+	    set_lattice_to_bottom (&plats->itself);
+	    if (dump_file && (dump_flags & TDF_DETAILS)
+		&& !node->alias && !node->thunk.thunk_p)
+	      fprintf (dump_file, "Going to ignore param %i of of %s/%i.\n",
+		       i, cgraph_node_name (node), node->uid);
+	  }
+      }
 
   for (ie = node->indirect_calls; ie; ie = ie->next_callee)
     if (ie->indirect_info->polymorphic)