84 lines
2.4 KiB
C
84 lines
2.4 KiB
C
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/* Alignment-related classes.
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Copyright (C) 2018-2023 Free Software Foundation, Inc.
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This file is part of GCC.
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GCC is free software; you can redistribute it and/or modify it under
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the terms of the GNU General Public License as published by the Free
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Software Foundation; either version 3, or (at your option) any later
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version.
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GCC is distributed in the hope that it will be useful, but WITHOUT ANY
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WARRANTY; without even the implied warranty of MERCHANTABILITY or
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FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
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for more details.
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You should have received a copy of the GNU General Public License
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along with GCC; see the file COPYING3. If not see
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<http://www.gnu.org/licenses/>. */
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/* Align flags tuple with alignment in log form and with a maximum skip. */
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struct align_flags_tuple
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{
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/* Values of the -falign-* flags: how much to align labels in code.
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log is "align to 2^log" (so 0 means no alignment).
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maxskip is the maximum allowed amount of padding to insert. */
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int log;
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int maxskip;
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/* Normalize filled values so that maxskip is not bigger than 1 << log. */
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void normalize ()
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{
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int n = (1 << log);
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if (maxskip > n)
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maxskip = n - 1;
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}
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/* Return original value of an alignment flag. */
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int get_value ()
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{
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return maxskip + 1;
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}
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};
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/* Alignment flags is structure used as value of -align-* options.
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It's used in target-dependant code. */
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class align_flags
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{
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public:
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/* Default constructor. */
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align_flags (int log0 = 0, int maxskip0 = 0, int log1 = 0, int maxskip1 = 0)
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{
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levels[0].log = log0;
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levels[0].maxskip = maxskip0;
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levels[1].log = log1;
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levels[1].maxskip = maxskip1;
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normalize ();
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}
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/* Normalize both components of align_flags. */
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void normalize ()
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{
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for (unsigned i = 0; i < 2; i++)
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levels[i].normalize ();
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}
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/* Get alignment that is common bigger alignment of alignments F0 and F1. */
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static align_flags max (const align_flags f0, const align_flags f1)
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{
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int log0 = MAX (f0.levels[0].log, f1.levels[0].log);
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int maxskip0 = MAX (f0.levels[0].maxskip, f1.levels[0].maxskip);
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int log1 = MAX (f0.levels[1].log, f1.levels[1].log);
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int maxskip1 = MAX (f0.levels[1].maxskip, f1.levels[1].maxskip);
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return align_flags (log0, maxskip0, log1, maxskip1);
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}
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align_flags_tuple levels[2];
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};
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/* Define maximum supported code alignment. */
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#define MAX_CODE_ALIGN 16
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#define MAX_CODE_ALIGN_VALUE (1 << MAX_CODE_ALIGN)
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