1 /* Adjust alignment for local variable.
2 Copyright (C) 2020-2022 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"
28 #include "memmodel.h"
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:
pass_adjust_alignment(gcc::context * ctxt)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
execute(function * fun)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 *
make_pass_adjust_alignment(gcc::context * ctxt)82 make_pass_adjust_alignment (gcc::context *ctxt)
83 {
84 return new pass_adjust_alignment (ctxt);
85 }
86