we have to change register_requirement when using dest am

[libfirm] / ir / opt / gvn_pre.c

diff --git a/ir/opt/gvn_pre.c b/ir/opt/gvn_pre.c
index 184e2d3..927cc4b 100644 (file)
--- a/ir/opt/gvn_pre.c
+++ b/ir/opt/gvn_pre.c
@@ -1,15 +1,33 @@
 /*
- * Project:     libFIRM
- * File name:   ir/opt/gvn_pre.c
- * Purpose:     Global Value Numbering Partial Redundancy Elimination
- *              (VanDrunen Hosking 2004)
- * Author:      Michael Beck, Rubino Geiss
- * Created:
- * CVS-ID:      $Id$
- * Copyright:   (c) 1998-2006 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   Global Value Numbering Partial Redundancy Elimination
+ *          (VanDrunen Hosking 2004)
+ * @author  Michael Beck, Rubino Geiss
+ * @version $Id$
+ * @summary
+ *
+ * Currently completely broken because our stes so NOT preserve
+ * the topological sort!
+ */
 #ifdef HAVE_CONFIG_H
 # include "config.h"
 #endif
@@ -957,7 +975,7 @@ static void eliminate_nodes(elim_pair *pairs)
 
 /*
  * Argh: Endless loops cause problems, because the
- * insert algorithm did not terminate. We get tranalated nodes that
+ * insert algorithm did not terminate. We get translated nodes that
  * references the origin. These nodes are translated again and again...
  *
  * The current fix is to use post-dominance. This simple ignores
@@ -971,6 +989,8 @@ void do_gvn_pre(ir_graph *irg)
   block_info *p;
   unsigned antic_iter, insert_iter;
 
+  assert(!"COMPLETELY BROKEN YET, DO NOT USE");
+
   /* register a debug mask */
   FIRM_DBG_REGISTER(dbg, "firm.opt.gvn_pre");
   firm_dbg_set_mask(dbg, SET_LEVEL_2);