re PR middle-end/48849 (SPEC CPU 2000/2006 failed to build with LTO)

2011-05-20  Richard Guenther  <rguenther@suse.de>

	PR middle-end/48849
	* gimple.c (gimple_register_canonical_type): Compute TYPE_CANONICAL
	of pointer types the same way the middle-end does.

From-SVN: r173939

gcc/ChangeLog

 2011-05-20  Richard Guenther  <rguenther@suse.de>
 
+	PR middle-end/48849
+	* gimple.c (gimple_register_canonical_type): Compute TYPE_CANONICAL
+	of pointer types the same way the middle-end does.
+
+2011-05-20  Richard Guenther  <rguenther@suse.de>
+
 	* gimple.c (gimple_register_type_1): Do not fiddle with
 	main-variant or pointer-to chains.  Delay all fixup to
 	uniquify_nodes.

gcc/gimple.c

@@ -4801,6 +4801,25 @@ gimple_register_canonical_type (tree t)
   if (TYPE_CANONICAL (t))
     return TYPE_CANONICAL (t);
 
+  /* For pointer and reference types do as the middle-end does - the
+     canonical type is a pointer to the canonical pointed-to type.  */
+  if (TREE_CODE (t) == POINTER_TYPE)
+    {
+      TYPE_CANONICAL (t)
+	  = build_pointer_type_for_mode
+	  (gimple_register_canonical_type (TREE_TYPE (t)),
+	   TYPE_MODE (t), TYPE_REF_CAN_ALIAS_ALL (t));
+      return TYPE_CANONICAL (t);
+    }
+  else if (TREE_CODE (t) == REFERENCE_TYPE)
+    {
+      TYPE_CANONICAL (t)
+	  = build_reference_type_for_mode
+	  (gimple_register_canonical_type (TREE_TYPE (t)),
+	   TYPE_MODE (t), TYPE_REF_CAN_ALIAS_ALL (t));
+      return TYPE_CANONICAL (t);
+    }
+
   if (gimple_canonical_types == NULL)
     gimple_canonical_types = htab_create_ggc (16381, gimple_canonical_type_hash,
 					      gimple_canonical_type_eq, 0);