avoid phi loops in mode_b lowerer

[libfirm] / ir / opt / reassoc.c

diff --git a/ir/opt/reassoc.c b/ir/opt/reassoc.c
index 9f16ce8..3a1a138 100644 (file)
--- a/ir/opt/reassoc.c
+++ b/ir/opt/reassoc.c
@@ -1,24 +1,38 @@
 /*
- * Project:     libFIRM
- * File name:   ir/opt/reassoc.c
- * Purpose:     Reassociation
- * Author:      Michael Beck
- * Created:
- * CVS-ID:      $Id$
- * Copyright:   (c) 1998-2007 Universität Karlsruhe
- * Licence:     This file protected by GPL -  GNU GENERAL PUBLIC LICENSE.
+ * Copyright (C) 1995-2007 University of Karlsruhe.  All right reserved.
+ *
+ * This file is part of libFirm.
+ *
+ * This file may be distributed and/or modified under the terms of the
+ * GNU General Public License version 2 as published by the Free Software
+ * Foundation and appearing in the file LICENSE.GPL included in the
+ * packaging of this file.
+ *
+ * Licensees holding valid libFirm Professional Edition licenses may use
+ * this file in accordance with the libFirm Commercial License.
+ * Agreement provided with the Software.
+ *
+ * This file is provided AS IS with NO WARRANTY OF ANY KIND, INCLUDING THE
+ * WARRANTY OF DESIGN, MERCHANTABILITY AND FITNESS FOR A PARTICULAR
+ * PURPOSE.
+ */
+
+/**
+ * @file
+ * @brief   Reassociation
+ * @author  Michael Beck
+ * @version $Id$
  */
 #ifdef HAVE_CONFIG_H
 #include "config.h"
 #endif
 
+#include "iropt_t.h"
 #include "irnode_t.h"
 #include "irgraph_t.h"
 #include "irmode_t.h"
-#include "iropt_t.h"
 #include "ircons_t.h"
 #include "irgmod.h"
-#include "dbginfo.h"
 #include "iropt_dbg.h"
 #include "irflag_t.h"
 #include "irgwalk.h"
@@ -167,6 +181,9 @@ static int reassoc_Sub(ir_node **in)
                DBG((dbg, LEVEL_5, "Applied: %n - %n => %n + (-%n)\n",
                        get_Sub_left(n), c, get_Sub_left(n), c));
 
+               if(n == irn)
+                       return 0;
+
                exchange(n, irn);
                *in = irn;