emit-rtl.c (gen_highpart): Add check for NULL_RTX.

2002-01-06  Craig Rodrigues  <rodrigc@gcc.gnu.org>

        * emit-rtl.c (gen_highpart): Add check for NULL_RTX.

From-SVN: r48586

gcc/ChangeLog

+2002-01-06  Craig Rodrigues  <rodrigc@gcc.gnu.org>
+
+	* emit-rtl.c (gen_highpart): Add check for NULL_RTX.
+
 2002-01-06  Jakub Jelinek  <jakub@redhat.com>
 
 	* objc/objc-act.c (handle_impent): Use assemble_variable to emit

gcc/emit-rtl.c

@@ -1200,7 +1200,7 @@ gen_highpart (mode, x)
   /* simplify_gen_subreg is not guaranteed to return a valid operand for
      the target if we have a MEM.  gen_highpart must return a valid operand,
      emitting code if necessary to do so.  */
-  if (GET_CODE (result) == MEM)
+  if (result != NULL_RTX && GET_CODE (result) == MEM)
     result = validize_mem (result);
 
   if (!result)