--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/gcc/config/epiphany/mode-switch-use.c	Fri Oct 27 22:46:09 2017 +0900
@@ -0,0 +1,105 @@
+/* Insert USEs in instructions that require mode switching.
+   This should probably be merged into mode-switching.c .
+   Copyright (C) 2011-2017 Free Software Foundation, Inc.
+   Contributed by Embecosm on behalf of Adapteva, 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/>.  */
+
+#include "config.h"
+#include "system.h"
+#include "coretypes.h"
+#include "backend.h"
+#include "rtl.h"
+#include "df.h"
+#include "memmodel.h"
+#include "tm_p.h"
+#include "emit-rtl.h"
+#include "tree-pass.h"
+#include "insn-attr.h"
+
+#ifndef TARGET_INSERT_MODE_SWITCH_USE
+#define TARGET_INSERT_MODE_SWITCH_USE NULL
+#endif
+
+static unsigned int
+insert_uses (void)
+{
+  static const int num_modes[] = NUM_MODES_FOR_MODE_SWITCHING;
+#define N_ENTITIES ARRAY_SIZE (num_modes)
+  int e;
+  void (*target_insert_mode_switch_use) (rtx_insn *insn, int, int)
+    = TARGET_INSERT_MODE_SWITCH_USE;
+
+  for (e = N_ENTITIES - 1; e >= 0; e--)
+    {
+      int no_mode = num_modes[e];
+      rtx_insn *insn;
+      int mode;
+
+      if (!OPTIMIZE_MODE_SWITCHING (e))
+	continue;
+      for (insn = get_insns (); insn; insn = NEXT_INSN (insn))
+	{
+	  if (!INSN_P (insn))
+	    continue;
+	  mode = epiphany_mode_needed (e, insn);
+	  if (mode == no_mode)
+	    continue;
+	  if (target_insert_mode_switch_use)
+	    {
+	      target_insert_mode_switch_use (insn, e, mode);
+	      df_insn_rescan (insn);
+	    }
+	}
+    }
+  return 0;
+}
+
+namespace {
+
+const pass_data pass_data_mode_switch_use =
+{
+  RTL_PASS, /* type */
+  "mode_switch_use", /* name */
+  OPTGROUP_NONE, /* optinfo_flags */
+  TV_NONE, /* tv_id */
+  0, /* properties_required */
+  0, /* properties_provided */
+  0, /* properties_destroyed */
+  0, /* todo_flags_start */
+  0, /* todo_flags_finish */
+};
+
+class pass_mode_switch_use : public rtl_opt_pass
+{
+public:
+  pass_mode_switch_use(gcc::context *ctxt)
+    : rtl_opt_pass(pass_data_mode_switch_use, ctxt)
+  {}
+
+  /* opt_pass methods: */
+  virtual unsigned int execute (function *) { return insert_uses (); }
+
+}; // class pass_mode_switch_use
+
+} // anon namespace
+
+rtl_opt_pass *
+make_pass_mode_switch_use (gcc::context *ctxt)
+{
+  return new pass_mode_switch_use (ctxt);
+}