dce.c (run_word_dce): Take flag_dce into account.

	* dce.c (run_word_dce): Take flag_dce into account.  Clear and restore
	df flags as in run_fast_df_dce.

From-SVN: r162697

gcc/ChangeLog

+2010-07-29  Bernd Schmidt  <bernds@codesourcery.com>
+
+	* dce.c (run_word_dce): Take flag_dce into account.  Clear and restore
+	df flags as in run_fast_df_dce.
+
 2010-07-29  Jakub Jelinek  <jakub@redhat.com>
 
 	Revert:

gcc/dce.c

@@ -1025,11 +1025,18 @@ rest_of_handle_fast_dce (void)
 void
 run_word_dce (void)
 {
+  int old_flags;
+
+  if (!flag_dce)
+    return;
+
   timevar_push (TV_DCE);
+  old_flags = df_clear_flags (DF_DEFER_INSN_RESCAN + DF_NO_INSN_RESCAN);
   df_word_lr_add_problem ();
   init_dce (true);
   fast_dce (true);
   fini_dce (true);
+  df_set_flags (old_flags);
   timevar_pop (TV_DCE);
 }