--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/gcc/tree-ssa-threadedge.h	Fri Oct 27 22:46:09 2017 +0900
@@ -0,0 +1,39 @@
+/* Header file for SSA jump threading.
+   Copyright (C) 2013-2017 Free Software Foundation, Inc.
+
+This file is part of GCC.
+
+GCC is free software; you can redistribute it and/or modify it under
+the terms of the GNU General Public License as published by the Free
+Software Foundation; either version 3, or (at your option) any later
+version.
+
+GCC is distributed in the hope that it will be useful, but WITHOUT ANY
+WARRANTY; without even the implied warranty of MERCHANTABILITY or
+FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
+ for more details.
+
+You should have received a copy of the GNU General Public License
+along with GCC; see the file COPYING3.  If not see
+<http://www.gnu.org/licenses/>.  */
+
+#ifndef GCC_TREE_SSA_THREADEDGE_H
+#define GCC_TREE_SSA_THREADEDGE_H
+
+extern vec<tree> ssa_name_values;
+#define SSA_NAME_VALUE(x) \
+    (SSA_NAME_VERSION (x) < ssa_name_values.length () \
+     ? ssa_name_values[SSA_NAME_VERSION (x)] \
+     : NULL_TREE)
+extern void set_ssa_name_value (tree, tree);
+extern void threadedge_initialize_values (void);
+extern void threadedge_finalize_values (void);
+extern bool potentially_threadable_block (basic_block);
+extern void propagate_threaded_block_debug_into (basic_block, basic_block);
+extern void thread_outgoing_edges (basic_block, gcond *,
+				   const_and_copies *,
+				   avail_exprs_stack *,
+				   tree (*) (gimple *, gimple *,
+					     avail_exprs_stack *, basic_block));
+
+#endif /* GCC_TREE_SSA_THREADEDGE_H */