mode-switch-use.c revision 1.1.1.1 
1/* Insert USEs in instructions that require mode switching.
2   This should probably be merged into mode-switching.c .
3   Copyright (C) 2011-2013 Free Software Foundation, Inc.
4   Contributed by Embecosm on behalf of Adapteva, Inc.
5
6This file is part of GCC.
7
8GCC is free software; you can redistribute it and/or modify
9it under the terms of the GNU General Public License as published by
10the Free Software Foundation; either version 3, or (at your option)
11any later version.
12
13GCC is distributed in the hope that it will be useful,
14but WITHOUT ANY WARRANTY; without even the implied warranty of
15MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
16GNU General Public License for more details.
17
18You should have received a copy of the GNU General Public License
19along with GCC; see the file COPYING3.  If not see
20<http://www.gnu.org/licenses/>.  */
21
22#include "config.h"
23#include "system.h"
24#include "coretypes.h"
25#include "tm.h"
26#include "rtl.h"
27#include "function.h"
28#include "emit-rtl.h"
29#include "tree-pass.h"
30#include "insn-attr.h"
31#include "insn-config.h"
32#include "recog.h"
33#include "tm_p.h"
34#include "df.h"
35
36#ifndef TARGET_INSERT_MODE_SWITCH_USE
37#define TARGET_INSERT_MODE_SWITCH_USE NULL
38#endif
39
40static unsigned int
41insert_uses (void)
42{
43  static const int num_modes[] = NUM_MODES_FOR_MODE_SWITCHING;
44#define N_ENTITIES ARRAY_SIZE (num_modes)
45  int e;
46  void (*target_insert_mode_switch_use) (rtx insn, int, int)
47    = TARGET_INSERT_MODE_SWITCH_USE;
48
49  for (e = N_ENTITIES - 1; e >= 0; e--)
50    {
51      int no_mode = num_modes[e];
52      rtx insn;
53      int mode;
54
55      if (!OPTIMIZE_MODE_SWITCHING (e))
56	continue;
57      for (insn = get_insns (); insn; insn = NEXT_INSN (insn))
58	{
59	  if (!INSN_P (insn))
60	    continue;
61	  mode = MODE_NEEDED (e, insn);
62	  if (mode == no_mode)
63	    continue;
64	  if (target_insert_mode_switch_use)
65	    {
66	      target_insert_mode_switch_use (insn, e, mode);
67	      df_insn_rescan (insn);
68	    }
69	}
70    }
71  return 0;
72}
73
74struct rtl_opt_pass pass_mode_switch_use =
75{
76 {
77  RTL_PASS,
78  "mode_switch_use",			/* name */
79  OPTGROUP_NONE,			/* optinfo_flags */
80  NULL,					/* gate */
81  insert_uses,				/* execute */
82  NULL,					/* sub */
83  NULL,					/* next */
84  0,					/* static_pass_number */
85  TV_NONE,				/* tv_id */
86  0,					/* properties_required */
87  0,					/* properties_provided */
88  0,					/* properties_destroyed */
89  0,					/* todo_flags_start */
90  0,					/* todo_flags_finish */
91 }
92};
93