gcc/config/epiphany/mode-switch-use.c

   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
   6 This file is part of GCC.
   7
   8 GCC is free software; you can redistribute it and/or modify
   9 it under the terms of the GNU General Public License as published by
  10 the Free Software Foundation; either version 3, or (at your option)
  11 any later version.
  12
  13 GCC is distributed in the hope that it will be useful,
  14 but WITHOUT ANY WARRANTY; without even the implied warranty of
  15 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  16 GNU General Public License for more details.
  17
  18 You should have received a copy of the GNU General Public License
  19 along 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
  37 static unsigned int
  38 insert_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
  71 namespace {
  72
  73 const 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
  86 class pass_mode_switch_use : public rtl_opt_pass
  87 {
  88 public:
  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
 100 rtl_opt_pass *
 101 make_pass_mode_switch_use (gcc::context *ctxt)
 102 {
 103   return new pass_mode_switch_use (ctxt);
 104 }