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111
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1 /* Insert USEs in instructions that require mode switching.
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2 This should probably be merged into mode-switching.c .
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3 Copyright (C) 2011-2017 Free Software Foundation, Inc.
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4 Contributed by Embecosm on behalf of Adapteva, Inc.
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5
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6 This file is part of GCC.
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7
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8 GCC is free software; you can redistribute it and/or modify
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9 it under the terms of the GNU General Public License as published by
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10 the Free Software Foundation; either version 3, or (at your option)
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11 any later version.
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12
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13 GCC is distributed in the hope that it will be useful,
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14 but WITHOUT ANY WARRANTY; without even the implied warranty of
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15 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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16 GNU General Public License for more details.
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17
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18 You should have received a copy of the GNU General Public License
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19 along with GCC; see the file COPYING3. If not see
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20 <http://www.gnu.org/licenses/>. */
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21
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22 #include "config.h"
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23 #include "system.h"
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24 #include "coretypes.h"
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25 #include "backend.h"
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26 #include "rtl.h"
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27 #include "df.h"
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28 #include "memmodel.h"
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29 #include "tm_p.h"
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30 #include "emit-rtl.h"
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31 #include "tree-pass.h"
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32 #include "insn-attr.h"
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33
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34 #ifndef TARGET_INSERT_MODE_SWITCH_USE
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35 #define TARGET_INSERT_MODE_SWITCH_USE NULL
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36 #endif
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37
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38 static unsigned int
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39 insert_uses (void)
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40 {
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41 static const int num_modes[] = NUM_MODES_FOR_MODE_SWITCHING;
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42 #define N_ENTITIES ARRAY_SIZE (num_modes)
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43 int e;
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44 void (*target_insert_mode_switch_use) (rtx_insn *insn, int, int)
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45 = TARGET_INSERT_MODE_SWITCH_USE;
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46
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47 for (e = N_ENTITIES - 1; e >= 0; e--)
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48 {
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49 int no_mode = num_modes[e];
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50 rtx_insn *insn;
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51 int mode;
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52
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53 if (!OPTIMIZE_MODE_SWITCHING (e))
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54 continue;
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55 for (insn = get_insns (); insn; insn = NEXT_INSN (insn))
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56 {
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57 if (!INSN_P (insn))
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58 continue;
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59 mode = epiphany_mode_needed (e, insn);
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60 if (mode == no_mode)
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61 continue;
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62 if (target_insert_mode_switch_use)
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63 {
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64 target_insert_mode_switch_use (insn, e, mode);
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65 df_insn_rescan (insn);
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66 }
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67 }
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68 }
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69 return 0;
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70 }
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71
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72 namespace {
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73
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74 const pass_data pass_data_mode_switch_use =
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75 {
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76 RTL_PASS, /* type */
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77 "mode_switch_use", /* name */
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78 OPTGROUP_NONE, /* optinfo_flags */
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79 TV_NONE, /* tv_id */
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80 0, /* properties_required */
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81 0, /* properties_provided */
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82 0, /* properties_destroyed */
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83 0, /* todo_flags_start */
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84 0, /* todo_flags_finish */
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85 };
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86
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87 class pass_mode_switch_use : public rtl_opt_pass
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88 {
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89 public:
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90 pass_mode_switch_use(gcc::context *ctxt)
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91 : rtl_opt_pass(pass_data_mode_switch_use, ctxt)
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92 {}
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93
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94 /* opt_pass methods: */
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95 virtual unsigned int execute (function *) { return insert_uses (); }
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96
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97 }; // class pass_mode_switch_use
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98
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99 } // anon namespace
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100
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101 rtl_opt_pass *
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102 make_pass_mode_switch_use (gcc::context *ctxt)
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103 {
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104 return new pass_mode_switch_use (ctxt);
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105 }
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