tree.c (build_qualified_type): Chain the new type to the original type's TYPE_NEXT_PTR_TO or TYPE_NEXT_REF_TO...

	* tree.c (build_qualified_type): Chain the new type to the original
	type's TYPE_NEXT_PTR_TO or TYPE_NEXT_REF_TO linked lists if it is
	a POINTER_TYPE or a REFERENCE_TYPE respectively.
	(build_pointer_type_for_mode): Only return unqualified types.
	(build_reference_type_for_mode): Likewise.

From-SVN: r106716

1 files changed, 24 insertions, 6 deletions

diff --git a/gcc/tree.c b/gcc/tree.c
index ccd6cf5..4edccd5 100644
--- a/gcc/tree.c
+++ b/gcc/tree.c
@@ -3702,6 +3702,20 @@ build_qualified_type (tree type, int type_quals)
     {
       t = build_variant_type_copy (type);
       set_type_quals (t, type_quals);
+
+      /* If it's a pointer type, the new variant points to the same type.  */
+      if (TREE_CODE (type) == POINTER_TYPE)
+	{
+	  TYPE_NEXT_PTR_TO (t) = TYPE_NEXT_PTR_TO (type);
+	  TYPE_NEXT_PTR_TO (type) = t;
+	}
+
+      /* Same for a reference type.  */
+      else if (TREE_CODE (type) == REFERENCE_TYPE)
+	{
+	  TYPE_NEXT_REF_TO (t) = TYPE_NEXT_REF_TO (type);
+	  TYPE_NEXT_REF_TO (type) = t;
+	}
     }
 
   return t;
@@ -4817,10 +4831,12 @@ build_pointer_type_for_mode (tree to_type, enum machine_mode mode,
       && TREE_CODE (TYPE_POINTER_TO (to_type)) != POINTER_TYPE)
     return TYPE_POINTER_TO (to_type);
 
-  /* First, if we already have a type for pointers to TO_TYPE and it's
-     the proper mode, use it.  */
+  /* First, if we already have an unqualified type for pointers to TO_TYPE
+     and it's the proper mode, use it.  */
   for (t = TYPE_POINTER_TO (to_type); t; t = TYPE_NEXT_PTR_TO (t))
-    if (TYPE_MODE (t) == mode && TYPE_REF_CAN_ALIAS_ALL (t) == can_alias_all)
+    if (TYPE_MODE (t) == mode
+	&& !TYPE_QUALS (t)
+	&& TYPE_REF_CAN_ALIAS_ALL (t) == can_alias_all)
       return t;
 
   t = make_node (POINTER_TYPE);
@@ -4866,10 +4882,12 @@ build_reference_type_for_mode (tree to_type, enum machine_mode mode,
       && TREE_CODE (TYPE_REFERENCE_TO (to_type)) != REFERENCE_TYPE)
     return TYPE_REFERENCE_TO (to_type);
 
-  /* First, if we already have a type for pointers to TO_TYPE and it's
-     the proper mode, use it.  */
+  /* First, if we already have an unqualified type for references to TO_TYPE
+     and it's the proper mode, use it.  */
   for (t = TYPE_REFERENCE_TO (to_type); t; t = TYPE_NEXT_REF_TO (t))
-    if (TYPE_MODE (t) == mode && TYPE_REF_CAN_ALIAS_ALL (t) == can_alias_all)
+    if (TYPE_MODE (t) == mode
+	&& !TYPE_QUALS (t)
+	&& TYPE_REF_CAN_ALIAS_ALL (t) == can_alias_all)
       return t;
 
   t = make_node (REFERENCE_TYPE);