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1 : : /* Alignment-related classes.
2 : : Copyright (C) 2018-2024 Free Software Foundation, Inc.
3 : :
4 : : This file is part of GCC.
5 : :
6 : : GCC is free software; you can redistribute it and/or modify it under
7 : : the terms of the GNU General Public License as published by the Free
8 : : Software Foundation; either version 3, or (at your option) any later
9 : : version.
10 : :
11 : : GCC is distributed in the hope that it will be useful, but WITHOUT ANY
12 : : WARRANTY; without even the implied warranty of MERCHANTABILITY or
13 : : FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
14 : : for more details.
15 : :
16 : : You should have received a copy of the GNU General Public License
17 : : along with GCC; see the file COPYING3. If not see
18 : : <http://www.gnu.org/licenses/>. */
19 : :
20 : : /* Align flags tuple with alignment in log form and with a maximum skip. */
21 : :
22 : : struct align_flags_tuple
23 : : {
24 : : /* Values of the -falign-* flags: how much to align labels in code.
25 : : log is "align to 2^log" (so 0 means no alignment).
26 : : maxskip is the maximum allowed amount of padding to insert. */
27 : : int log;
28 : : int maxskip;
29 : :
30 : : /* Normalize filled values so that maxskip is not bigger than 1 << log. */
31 : 92610723 : void normalize ()
32 : : {
33 : 92610723 : int n = (1 << log);
34 : 90401091 : if (maxskip > n)
35 : 0 : maxskip = n - 1;
36 : : }
37 : :
38 : : /* Return original value of an alignment flag. */
39 : : int get_value ()
40 : : {
41 : : return maxskip + 1;
42 : : }
43 : : };
44 : :
45 : : /* Alignment flags is structure used as value of -align-* options.
46 : : It's used in target-dependant code. */
47 : :
48 : : class align_flags
49 : : {
50 : : public:
51 : : /* Default constructor. */
52 : 44912470 : align_flags (int log0 = 0, int maxskip0 = 0, int log1 = 0, int maxskip1 = 0)
53 : 44912470 : {
54 : 44912470 : levels[0].log = log0;
55 : 44912470 : levels[0].maxskip = maxskip0;
56 : 44912470 : levels[1].log = log1;
57 : 44912470 : levels[1].maxskip = maxskip1;
58 : 27956936 : normalize ();
59 : : }
60 : :
61 : : /* Normalize both components of align_flags. */
62 : 46017286 : void normalize ()
63 : : {
64 : 138051858 : for (unsigned i = 0; i < 2; i++)
65 : 92034572 : levels[i].normalize ();
66 : 46017286 : }
67 : :
68 : : /* Get alignment that is common bigger alignment of alignments F0 and F1. */
69 : 16955534 : static align_flags max (const align_flags f0, const align_flags f1)
70 : : {
71 : 16955534 : int log0 = MAX (f0.levels[0].log, f1.levels[0].log);
72 : 16955534 : int maxskip0 = MAX (f0.levels[0].maxskip, f1.levels[0].maxskip);
73 : 16955534 : int log1 = MAX (f0.levels[1].log, f1.levels[1].log);
74 : 16955534 : int maxskip1 = MAX (f0.levels[1].maxskip, f1.levels[1].maxskip);
75 : 16955534 : return align_flags (log0, maxskip0, log1, maxskip1);
76 : : }
77 : :
78 : : align_flags_tuple levels[2];
79 : : };
80 : :
81 : : /* Define maximum supported code alignment. */
82 : : #define MAX_CODE_ALIGN 16
83 : : #define MAX_CODE_ALIGN_VALUE (1 << MAX_CODE_ALIGN)
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