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) 2011-2013 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 "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
  40 static unsigned int
  41 insert_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
  74 namespace {
  75
  76 const pass_data pass_data_mode_switch_use =
  77 {
  78   RTL_PASS, /* type */
  79   "mode_switch_use", /* name */
  80   OPTGROUP_NONE, /* optinfo_flags */
  81   false, /* has_gate */
  82   true, /* has_execute */
  83   TV_NONE, /* tv_id */
  84   0, /* properties_required */
  85   0, /* properties_provided */
  86   0, /* properties_destroyed */
  87   0, /* todo_flags_start */
  88   0, /* todo_flags_finish */
  89 };
  90
  91 class pass_mode_switch_use : public rtl_opt_pass
  92 {
  93 public:
  94   pass_mode_switch_use(gcc::context *ctxt)
  95     : rtl_opt_pass(pass_data_mode_switch_use, ctxt)
  96   {}
  97
  98   /* opt_pass methods: */
  99   unsigned int execute () { return insert_uses (); }
 100
 101 }; // class pass_mode_switch_use
 102
 103 } // anon namespace
 104
 105 rtl_opt_pass *
 106 make_pass_mode_switch_use (gcc::context *ctxt)
 107 {
 108   return new pass_mode_switch_use (ctxt);
 109 }