--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/gcc/shrink-wrap.h	Fri Oct 27 22:46:09 2017 +0900
@@ -0,0 +1,34 @@
+/* Shrink-wrapping related functions.
+   Copyright (C) 1989-2017 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_SHRINK_WRAP_H
+#define GCC_SHRINK_WRAP_H
+
+#include "function.h"
+
+/* In shrink-wrap.c.  */
+extern bool requires_stack_frame_p (rtx_insn *, HARD_REG_SET, HARD_REG_SET);
+extern void try_shrink_wrapping (edge *entry_edge, rtx_insn *prologue_seq);
+extern void try_shrink_wrapping_separate (basic_block first_bb);
+#define SHRINK_WRAPPING_ENABLED \
+  (flag_shrink_wrap && targetm.have_simple_return ())
+
+#endif  /* GCC_SHRINK_WRAP_H  */
+
+