mode-switch-use.c revision 1.4 
1/* Insert USEs in instructions that require mode switching.
2   This should probably be merged into mode-switching.c .
3   Copyright (C) 2011-2016 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 "backend.h"
26#include "rtl.h"
27#include "df.h"
28#include "tm_p.h"
29#include "emit-rtl.h"
30#include "tree-pass.h"
31#include "insn-attr.h"
32
33#ifndef TARGET_INSERT_MODE_SWITCH_USE
34#define TARGET_INSERT_MODE_SWITCH_USE NULL
35#endif
36
37static unsigned int
38insert_uses (void)
39{
40  static const int num_modes[] = NUM_MODES_FOR_MODE_SWITCHING;
41#define N_ENTITIES ARRAY_SIZE (num_modes)
42  int e;
43  void (*target_insert_mode_switch_use) (rtx_insn *insn, int, int)
44    = TARGET_INSERT_MODE_SWITCH_USE;
45
46  for (e = N_ENTITIES - 1; e >= 0; e--)
47    {
48      int no_mode = num_modes[e];
49      rtx_insn *insn;
50      int mode;
51
52      if (!OPTIMIZE_MODE_SWITCHING (e))
53	continue;
54      for (insn = get_insns (); insn; insn = NEXT_INSN (insn))
55	{
56	  if (!INSN_P (insn))
57	    continue;
58	  mode = epiphany_mode_needed (e, insn);
59	  if (mode == no_mode)
60	    continue;
61	  if (target_insert_mode_switch_use)
62	    {
63	      target_insert_mode_switch_use (insn, e, mode);
64	      df_insn_rescan (insn);
65	    }
66	}
67    }
68  return 0;
69}
70
71namespace {
72
73const pass_data pass_data_mode_switch_use =
74{
75  RTL_PASS, /* type */
76  "mode_switch_use", /* name */
77  OPTGROUP_NONE, /* optinfo_flags */
78  TV_NONE, /* tv_id */
79  0, /* properties_required */
80  0, /* properties_provided */
81  0, /* properties_destroyed */
82  0, /* todo_flags_start */
83  0, /* todo_flags_finish */
84};
85
86class pass_mode_switch_use : public rtl_opt_pass
87{
88public:
89  pass_mode_switch_use(gcc::context *ctxt)
90    : rtl_opt_pass(pass_data_mode_switch_use, ctxt)
91  {}
92
93  /* opt_pass methods: */
94  virtual unsigned int execute (function *) { return insert_uses (); }
95
96}; // class pass_mode_switch_use
97
98} // anon namespace
99
100rtl_opt_pass *
101make_pass_mode_switch_use (gcc::context *ctxt)
102{
103  return new pass_mode_switch_use (ctxt);
104}
105