1/* Insert USEs in instructions that require mode switching.
2   This should probably be merged into mode-switching.c .
3   Copyright (C) 2011-2020 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#define IN_TARGET_CODE 1
23
24#include "config.h"
25#include "system.h"
26#include "coretypes.h"
27#include "backend.h"
28#include "rtl.h"
29#include "df.h"
30#include "memmodel.h"
31#include "tm_p.h"
32#include "emit-rtl.h"
33#include "tree-pass.h"
34#include "insn-attr.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 *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 *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 = epiphany_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
74namespace {
75
76const pass_data pass_data_mode_switch_use =
77{
78  RTL_PASS, /* type */
79  "mode_switch_use", /* name */
80  OPTGROUP_NONE, /* optinfo_flags */
81  TV_NONE, /* tv_id */
82  0, /* properties_required */
83  0, /* properties_provided */
84  0, /* properties_destroyed */
85  0, /* todo_flags_start */
86  0, /* todo_flags_finish */
87};
88
89class pass_mode_switch_use : public rtl_opt_pass
90{
91public:
92  pass_mode_switch_use(gcc::context *ctxt)
93    : rtl_opt_pass(pass_data_mode_switch_use, ctxt)
94  {}
95
96  /* opt_pass methods: */
97  virtual unsigned int execute (function *) { return insert_uses (); }
98
99}; // class pass_mode_switch_use
100
101} // anon namespace
102
103rtl_opt_pass *
104make_pass_mode_switch_use (gcc::context *ctxt)
105{
106  return new pass_mode_switch_use (ctxt);
107}
108