--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/gcc/tree-phinodes.h	Fri Oct 27 22:46:09 2017 +0900
@@ -0,0 +1,68 @@
+/* Header file for PHI node routines
+   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_PHINODES_H
+#define GCC_TREE_PHINODES_H
+
+extern void phinodes_print_statistics (void);
+extern void reserve_phi_args_for_new_edge (basic_block);
+extern void add_phi_node_to_bb (gphi *phi, basic_block bb);
+extern gphi *create_phi_node (tree, basic_block);
+extern void add_phi_arg (gphi *, tree, edge, source_location);
+extern void remove_phi_args (edge);
+extern void remove_phi_node (gimple_stmt_iterator *, bool);
+extern void remove_phi_nodes (basic_block);
+extern tree degenerate_phi_result (gphi *);
+extern void set_phi_nodes (basic_block, gimple_seq);
+
+static inline use_operand_p
+gimple_phi_arg_imm_use_ptr (gimple *gs, int i)
+{
+  return &gimple_phi_arg (gs, i)->imm_use;
+}
+
+/* Return the phi argument which contains the specified use.  */
+
+static inline int
+phi_arg_index_from_use (use_operand_p use)
+{
+  struct phi_arg_d *element, *root;
+  size_t index;
+  gimple *phi;
+
+  /* Since the use is the first thing in a PHI argument element, we can
+     calculate its index based on casting it to an argument, and performing
+     pointer arithmetic.  */
+
+  phi = USE_STMT (use);
+
+  element = (struct phi_arg_d *)use;
+  root = gimple_phi_arg (phi, 0);
+  index = element - root;
+
+  /* Make sure the calculation doesn't have any leftover bytes.  If it does,
+     then imm_use is likely not the first element in phi_arg_d.  */
+  gcc_checking_assert ((((char *)element - (char *)root)
+			% sizeof (struct phi_arg_d)) == 0
+		       && index < gimple_phi_capacity (phi));
+
+ return index;
+}
+
+#endif /* GCC_TREE_PHINODES_H */