re PR tree-optimization/21304 (very long compile times with large cpp file from kdebindings)

2005-10-13  Andrew Pinski  <pinskia@physics.uc.edu>

        PR tree-opt/21304
        * tree-dfa.c (add_referenced_var): Only look at decls which
        have TREE_CONSTANT or TREE_READONLY set instead of if
        !TREE_PUBLIC or !TREE_CONSTANT.

From-SVN: r105390

gcc/ChangeLog

+2005-10-13  Andrew Pinski  <pinskia@physics.uc.edu>
+
+	PR tree-opt/21304
+	* tree-dfa.c (add_referenced_var): Only look at decls which
+	have TREE_CONSTANT or TREE_READONLY set instead of if
+	!TREE_PUBLIC or !TREE_CONSTANT.
+
 2005-10-13  James E Wilson  <wilson@specifix.com>
 
 	* doc/invoke.texi: For -x, add f95-cpp-input.

gcc/tree-dfa.c

@@ -651,9 +651,9 @@ add_referenced_var (tree var, struct walk_state *walk_state)
 	     optimizers.  */
           && !DECL_EXTERNAL (var)
 	  /* It's not necessary to walk the initial value of non-constant
-	     public variables because it cannot be propagated by the
+	     variables because it cannot be propagated by the
 	     optimizers.  */
-	  && (!TREE_PUBLIC (var) || !TREE_CONSTANT (var)))
+	  && (TREE_CONSTANT (var) || TREE_READONLY (var)))
       	walk_tree (&DECL_INITIAL (var), find_vars_r, walk_state, 0);
     }
 }