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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                 :    92669741 :   void normalize ()
      32                 :             :   {
      33                 :    92669741 :     int n = (1 << log);
      34                 :    90437245 :     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                 :    44929737 :   align_flags (int log0 = 0, int maxskip0 = 0, int log1 = 0, int maxskip1 = 0)
      53                 :    44929737 :   {
      54                 :    44929737 :     levels[0].log = log0;
      55                 :    44929737 :     levels[0].maxskip = maxskip0;
      56                 :    44929737 :     levels[1].log = log1;
      57                 :    44929737 :     levels[1].maxskip = maxskip1;
      58                 :    27962075 :     normalize ();
      59                 :             :   }
      60                 :             : 
      61                 :             :   /* Normalize both components of align_flags.  */
      62                 :    46045985 :   void normalize ()
      63                 :             :   {
      64                 :   138137955 :     for (unsigned i = 0; i < 2; i++)
      65                 :    92091970 :       levels[i].normalize ();
      66                 :    46045985 :   }
      67                 :             : 
      68                 :             :   /* Get alignment that is common bigger alignment of alignments F0 and F1.  */
      69                 :    16967662 :   static align_flags max (const align_flags f0, const align_flags f1)
      70                 :             :     {
      71                 :    16967662 :       int log0 = MAX (f0.levels[0].log, f1.levels[0].log);
      72                 :    16967662 :       int maxskip0 = MAX (f0.levels[0].maxskip, f1.levels[0].maxskip);
      73                 :    16967662 :       int log1 = MAX (f0.levels[1].log, f1.levels[1].log);
      74                 :    16967662 :       int maxskip1 = MAX (f0.levels[1].maxskip, f1.levels[1].maxskip);
      75                 :    16967662 :       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)