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152
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1 /* Adjust alignment for local variable.
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2 Copyright (C) 2020 Free Software Foundation, Inc.
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3 Contributed by Kito Cheng <kito.cheng@sifive.com>
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4
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5 This file is part of GCC.
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6
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7 GCC is free software; you can redistribute it and/or modify it under
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8 the terms of the GNU General Public License as published by the Free
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9 Software Foundation; either version 3, or (at your option) any later
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10 version.
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11
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12 GCC is distributed in the hope that it will be useful, but WITHOUT ANY
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13 WARRANTY; without even the implied warranty of MERCHANTABILITY or
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14 FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
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15 for more details.
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16
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17 You should have received a copy of the GNU General Public License
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18 along with GCC; see the file COPYING3. If not see
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19 <http://www.gnu.org/licenses/>. */
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20
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21 #include "config.h"
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22 #include "system.h"
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23 #include "coretypes.h"
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24 #include "backend.h"
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25 #include "target.h"
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26 #include "tree.h"
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27 #include "tree-pass.h"
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28 #include "memmodel.h"
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29 #include "tm_p.h"
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30
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31 namespace {
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32
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33 const pass_data pass_data_adjust_alignment =
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34 {
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35 GIMPLE_PASS, /* type */
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36 "adjust_alignment", /* name */
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37 OPTGROUP_NONE, /* optinfo_flags */
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38 TV_NONE, /* tv_id */
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39 0, /* properties_required */
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40 0, /* properties_provided */
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41 0, /* properties_destroyed */
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42 0, /* todo_flags_start */
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43 0, /* todo_flags_finish */
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44 };
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45
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46 class pass_adjust_alignment : public gimple_opt_pass
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47 {
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48 public:
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49 pass_adjust_alignment (gcc::context *ctxt)
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50 : gimple_opt_pass (pass_data_adjust_alignment, ctxt)
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51 {}
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52
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53 virtual unsigned int execute (function *);
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54 }; // class pass_adjust_alignment
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55
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56 } // anon namespace
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57
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58 /* Entry point to adjust_alignment pass. */
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59 unsigned int
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60 pass_adjust_alignment::execute (function *fun)
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61 {
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62 size_t i;
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63 tree var;
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64
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65 FOR_EACH_LOCAL_DECL (fun, i, var)
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66 {
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67 /* Don't adjust aligment for static local var and hard register var. */
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68 if (is_global_var (var) || DECL_HARD_REGISTER (var))
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69 continue;
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70
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71 unsigned align = LOCAL_DECL_ALIGNMENT (var);
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72
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73 /* Make sure alignment only increase. */
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74 gcc_assert (align >= DECL_ALIGN (var));
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75
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76 SET_DECL_ALIGN (var, align);
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77 }
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78 return 0;
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79 }
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80
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81 gimple_opt_pass *
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82 make_pass_adjust_alignment (gcc::context *ctxt)
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83 {
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84 return new pass_adjust_alignment (ctxt);
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85 }
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