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dfa4fcdb KC |
1 | /* Adjust alignment for local variable. |
2 | Copyright (C) 2020 Free Software Foundation, Inc. | |
3 | Contributed by Kito Cheng <kito.cheng@sifive.com> | |
4 | ||
5 | This file is part of GCC. | |
6 | ||
7 | GCC is free software; you can redistribute it and/or modify it under | |
8 | the terms of the GNU General Public License as published by the Free | |
9 | Software Foundation; either version 3, or (at your option) any later | |
10 | version. | |
11 | ||
12 | GCC is distributed in the hope that it will be useful, but WITHOUT ANY | |
13 | WARRANTY; without even the implied warranty of MERCHANTABILITY or | |
14 | FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License | |
15 | for more details. | |
16 | ||
17 | You should have received a copy of the GNU General Public License | |
18 | along with GCC; see the file COPYING3. If not see | |
19 | <http://www.gnu.org/licenses/>. */ | |
20 | ||
21 | #include "config.h" | |
22 | #include "system.h" | |
23 | #include "coretypes.h" | |
24 | #include "backend.h" | |
25 | #include "target.h" | |
26 | #include "tree.h" | |
27 | #include "tree-pass.h" | |
149c8c7c | 28 | #include "memmodel.h" |
dfa4fcdb KC |
29 | #include "tm_p.h" |
30 | ||
31 | namespace { | |
32 | ||
33 | const pass_data pass_data_adjust_alignment = | |
34 | { | |
35 | GIMPLE_PASS, /* type */ | |
36 | "adjust_alignment", /* name */ | |
37 | OPTGROUP_NONE, /* optinfo_flags */ | |
38 | TV_NONE, /* tv_id */ | |
39 | 0, /* properties_required */ | |
40 | 0, /* properties_provided */ | |
41 | 0, /* properties_destroyed */ | |
42 | 0, /* todo_flags_start */ | |
43 | 0, /* todo_flags_finish */ | |
44 | }; | |
45 | ||
46 | class pass_adjust_alignment : public gimple_opt_pass | |
47 | { | |
48 | public: | |
49 | pass_adjust_alignment (gcc::context *ctxt) | |
50 | : gimple_opt_pass (pass_data_adjust_alignment, ctxt) | |
51 | {} | |
52 | ||
53 | virtual unsigned int execute (function *); | |
54 | }; // class pass_adjust_alignment | |
55 | ||
56 | } // anon namespace | |
57 | ||
58 | /* Entry point to adjust_alignment pass. */ | |
59 | unsigned int | |
60 | pass_adjust_alignment::execute (function *fun) | |
61 | { | |
62 | size_t i; | |
63 | tree var; | |
64 | ||
65 | FOR_EACH_LOCAL_DECL (fun, i, var) | |
66 | { | |
67 | /* Don't adjust aligment for static local var and hard register var. */ | |
68 | if (is_global_var (var) || DECL_HARD_REGISTER (var)) | |
69 | continue; | |
70 | ||
71 | unsigned align = LOCAL_DECL_ALIGNMENT (var); | |
72 | ||
73 | /* Make sure alignment only increase. */ | |
74 | gcc_assert (align >= DECL_ALIGN (var)); | |
75 | ||
76 | SET_DECL_ALIGN (var, align); | |
77 | } | |
78 | return 0; | |
79 | } | |
80 | ||
81 | gimple_opt_pass * | |
82 | make_pass_adjust_alignment (gcc::context *ctxt) | |
83 | { | |
84 | return new pass_adjust_alignment (ctxt); | |
85 | } |