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/* Alignment-related classes.
Copyright (C) 2018-2020 Free Software Foundation, Inc.
This file is part of GCC.
GCC is free software; you can redistribute it and/or modify it under
the terms of the GNU General Public License as published by the Free
Software Foundation; either version 3, or (at your option) any later
version.
GCC is distributed in the hope that it will be useful, but WITHOUT ANY
WARRANTY; without even the implied warranty of MERCHANTABILITY or
FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
for more details.
You should have received a copy of the GNU General Public License
along with GCC; see the file COPYING3. If not see
<http://www.gnu.org/licenses/>. */
/* Align flags tuple with alignment in log form and with a maximum skip. */
struct align_flags_tuple
{
/* Values of the -falign-* flags: how much to align labels in code.
log is "align to 2^log" (so 0 means no alignment).
maxskip is the maximum allowed amount of padding to insert. */
int log;
int maxskip;
/* Normalize filled values so that maxskip is not bigger than 1 << log. */
void normalize ()
{
int n = (1 << log);
if (maxskip > n)
maxskip = n - 1;
}
/* Return original value of an alignment flag. */
int get_value ()
{
return maxskip + 1;
}
};
/* Alignment flags is structure used as value of -align-* options.
It's used in target-dependant code. */
class align_flags
{
public:
/* Default constructor. */
align_flags (int log0 = 0, int maxskip0 = 0, int log1 = 0, int maxskip1 = 0)
{
levels[0].log = log0;
levels[0].maxskip = maxskip0;
levels[1].log = log1;
levels[1].maxskip = maxskip1;
normalize ();
}
/* Normalize both components of align_flags. */
void normalize ()
{
for (unsigned i = 0; i < 2; i++)
levels[i].normalize ();
}
/* Get alignment that is common bigger alignment of alignments F0 and F1. */
static align_flags max (const align_flags f0, const align_flags f1)
{
int log0 = MAX (f0.levels[0].log, f1.levels[0].log);
int maxskip0 = MAX (f0.levels[0].maxskip, f1.levels[0].maxskip);
int log1 = MAX (f0.levels[1].log, f1.levels[1].log);
int maxskip1 = MAX (f0.levels[1].maxskip, f1.levels[1].maxskip);
return align_flags (log0, maxskip0, log1, maxskip1);
}
align_flags_tuple levels[2];
};
/* Define maximum supported code alignment. */
#define MAX_CODE_ALIGN 16
#define MAX_CODE_ALIGN_VALUE (1 << MAX_CODE_ALIGN)
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