Line data    Source code

       1              : /* Alignment-related classes.
       2              :    Copyright (C) 2018-2026 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     99293606 :   void normalize ()
      32              :   {
      33     99293606 :     int n = (1 << log);
      34     97016878 :     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     48209027 :   align_flags (int log0 = 0, int maxskip0 = 0, int log1 = 0, int maxskip1 = 0)
      53     48209027 :   {
      54     48209027 :     levels[0].log = log0;
      55     48209027 :     levels[0].maxskip = maxskip0;
      56     48209027 :     levels[1].log = log1;
      57     48209027 :     levels[1].maxskip = maxskip1;
      58     29848289 :     normalize ();
      59              :   }
      60              : 
      61              :   /* Normalize both components of align_flags.  */
      62     49347391 :   void normalize ()
      63              :   {
      64    148042173 :     for (unsigned i = 0; i < 2; i++)
      65     98694782 :       levels[i].normalize ();
      66     49347391 :   }
      67              : 
      68              :   /* Get alignment that is common bigger alignment of alignments F0 and F1.  */
      69     18360738 :   static align_flags max (const align_flags f0, const align_flags f1)
      70              :     {
      71     18360738 :       int log0 = MAX (f0.levels[0].log, f1.levels[0].log);
      72     18360738 :       int maxskip0 = MAX (f0.levels[0].maxskip, f1.levels[0].maxskip);
      73     18360738 :       int log1 = MAX (f0.levels[1].log, f1.levels[1].log);
      74     18360738 :       int maxskip1 = MAX (f0.levels[1].maxskip, f1.levels[1].maxskip);
      75     18360738 :       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)