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/* Insert USEs in instructions that require mode switching.

   This should probably be merged into mode-switching.c .

   Copyright (C) 2011 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 "tm.h"

#include "rtl.h"

#include "function.h"

#include "emit-rtl.h"

#include "tree-pass.h"

#include "insn-attr.h"

#include "insn-config.h"

#include "recog.h"

#include "tm_p.h"

#include "df.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, int, int)

    = TARGET_INSERT_MODE_SWITCH_USE;

  for (e = N_ENTITIES - 1; e >= 0; e--)

    {

      int no_mode = num_modes[e];

      rtx insn;

      int mode;

      if (!OPTIMIZE_MODE_SWITCHING (e))

        continue;

      for (insn = get_insns (); insn; insn = NEXT_INSN (insn))

        {

          if (!INSN_P (insn))

            continue;

          mode = 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;

}

struct rtl_opt_pass pass_mode_switch_use =

{

 {

  RTL_PASS,

  "mode_switch_use",                    /* name */

  NULL,                                 /* gate */

  insert_uses,                          /* execute */

  NULL,                                 /* sub */

  NULL,                                 /* next */

  0,                                     /* static_pass_number */

  TV_NONE,                              /* tv_id */

  0,                                     /* properties_required */

  0,                                     /* properties_provided */

  0,                                     /* properties_destroyed */

  0,                                     /* todo_flags_start */

  0,                                     /* todo_flags_finish */

 }

};