| 1 | /* Adjust alignment for local variable. |
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| 2 | Copyright (C) 2020-2023 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 | .type: GIMPLE_PASS, /* type */ |
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| 36 | .name: "adjust_alignment" , /* name */ |
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| 37 | .optinfo_flags: OPTGROUP_NONE, /* optinfo_flags */ |
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| 38 | .tv_id: TV_NONE, /* tv_id */ |
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| 39 | .properties_required: 0, /* properties_required */ |
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| 40 | .properties_provided: 0, /* properties_provided */ |
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| 41 | .properties_destroyed: 0, /* properties_destroyed */ |
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| 42 | .todo_flags_start: 0, /* todo_flags_start */ |
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| 43 | .todo_flags_finish: 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 | unsigned int execute (function *) final override; |
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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 (t: 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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| 86 | |
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