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) 2011-2015 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 "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 "cfgrtl.h"
  35 #include "cfganal.h"
  36 #include "lcm.h"
  37 #include "cfgbuild.h"
  38 #include "cfgcleanup.h"
  39
  40 #ifndef TARGET_INSERT_MODE_SWITCH_USE
  41 #define TARGET_INSERT_MODE_SWITCH_USE NULL
  42 #endif
  43
  44 static unsigned int
  45 insert_uses (void)
  46 {
  47   static const int num_modes[] = NUM_MODES_FOR_MODE_SWITCHING;
  48 #define N_ENTITIES ARRAY_SIZE (num_modes)
  49   int e;
  50   void (*target_insert_mode_switch_use) (rtx_insn *insn, int, int)
  51     = TARGET_INSERT_MODE_SWITCH_USE;
  52
  53   for (e = N_ENTITIES - 1; e >= 0; e--)
  54     {
  55       int no_mode = num_modes[e];
  56       rtx_insn *insn;
  57       int mode;
  58
  59       if (!OPTIMIZE_MODE_SWITCHING (e))
  60         continue;
  61       for (insn = get_insns (); insn; insn = NEXT_INSN (insn))
  62         {
  63           if (!INSN_P (insn))
  64             continue;
  65           mode = epiphany_mode_needed (e, insn);
  66           if (mode == no_mode)
  67             continue;
  68           if (target_insert_mode_switch_use)
  69             {
  70               target_insert_mode_switch_use (insn, e, mode);
  71               df_insn_rescan (insn);
  72             }
  73         }
  74     }
  75   return 0;
  76 }
  77
  78 namespace {
  79
  80 const pass_data pass_data_mode_switch_use =
  81 {
  82   RTL_PASS, /* type */
  83   "mode_switch_use", /* name */
  84   OPTGROUP_NONE, /* optinfo_flags */
  85   TV_NONE, /* tv_id */
  86   0, /* properties_required */
  87   0, /* properties_provided */
  88   0, /* properties_destroyed */
  89   0, /* todo_flags_start */
  90   0, /* todo_flags_finish */
  91 };
  92
  93 class pass_mode_switch_use : public rtl_opt_pass
  94 {
  95 public:
  96   pass_mode_switch_use(gcc::context *ctxt)
  97     : rtl_opt_pass(pass_data_mode_switch_use, ctxt)
  98   {}
  99
 100   /* opt_pass methods: */
 101   virtual unsigned int execute (function *) { return insert_uses (); }
 102
 103 }; // class pass_mode_switch_use
 104
 105 } // anon namespace
 106
 107 rtl_opt_pass *
 108 make_pass_mode_switch_use (gcc::context *ctxt)
 109 {
 110   return new pass_mode_switch_use (ctxt);
 111 }