stmt.c (expand_decl): Be more selective about calling mark_reg_pointer.

        * stmt.c (expand_decl): Be more selective about calling
        mark_reg_pointer.

From-SVN: r82533

gcc/ChangeLog

+2004-05-19  Jeff Law <law@redhat.com>
+
+        * stmt.c (expand_decl): Be more selective about calling
+        mark_reg_pointer.
+
 2004-06-01  Nicola Pero  <nicola@brainstorm.co.uk>
 
  	PR objc/7993

gcc/stmt.c

@@ -3422,12 +3422,21 @@ expand_decl (tree decl)
 
       SET_DECL_RTL (decl, gen_reg_rtx (reg_mode));
 
+      /* Note if the object is a user variable.  */
       if (!DECL_ARTIFICIAL (decl))
-	mark_user_reg (DECL_RTL (decl));
-
-      if (POINTER_TYPE_P (type))
-	mark_reg_pointer (DECL_RTL (decl),
-			  TYPE_ALIGN (TREE_TYPE (TREE_TYPE (decl))));
+	{
+	  mark_user_reg (DECL_RTL (decl));
+
+	  /* Trust user variables which have a pointer type to really
+	     be pointers.  Do not trust compiler generated temporaries
+	     as our type system is totally busted as it relates to
+	     pointer arithmetic which translates into lots of compiler
+	     generated objects with pointer types, but which are not really
+	     pointers.  */
+	  if (POINTER_TYPE_P (type))
+	    mark_reg_pointer (DECL_RTL (decl),
+			      TYPE_ALIGN (TREE_TYPE (TREE_TYPE (decl))));
+	}
 
       maybe_set_unchanging (DECL_RTL (decl), decl);