Line data    Source code

       1              : /* Adjust alignment for local variable.
       2              :    Copyright (C) 2020-2026 Free Software Foundation, Inc.
       3              :    Contributed by Kito Cheng <kito.cheng@sifive.com>
       4              : 
       5              : This file is part of GCC.
       6              : 
       7              : GCC is free software; you can redistribute it and/or modify it under
       8              : the terms of the GNU General Public License as published by the Free
       9              : Software Foundation; either version 3, or (at your option) any later
      10              : version.
      11              : 
      12              : GCC is distributed in the hope that it will be useful, but WITHOUT ANY
      13              : WARRANTY; without even the implied warranty of MERCHANTABILITY or
      14              : FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
      15              : for more details.
      16              : 
      17              : You should have received a copy of the GNU General Public License
      18              : along with GCC; see the file COPYING3.  If not see
      19              : <http://www.gnu.org/licenses/>.  */
      20              : 
      21              : #include "config.h"
      22              : #include "system.h"
      23              : #include "coretypes.h"
      24              : #include "backend.h"
      25              : #include "target.h"
      26              : #include "tree.h"
      27              : #include "tree-pass.h"
      28              : #include "memmodel.h"
      29              : #include "tm_p.h"
      30              : 
      31              : namespace {
      32              : 
      33              : const pass_data pass_data_adjust_alignment =
      34              : {
      35              :   GIMPLE_PASS, /* type */
      36              :   "adjust_alignment", /* name */
      37              :   OPTGROUP_NONE, /* optinfo_flags */
      38              :   TV_NONE, /* tv_id */
      39              :   0, /* properties_required */
      40              :   0, /* properties_provided */
      41              :   0, /* properties_destroyed */
      42              :   0, /* todo_flags_start */
      43              :   0, /* todo_flags_finish */
      44              : };
      45              : 
      46              : class pass_adjust_alignment : public gimple_opt_pass
      47              : {
      48              : public:
      49       285722 :   pass_adjust_alignment (gcc::context *ctxt)
      50       571444 :     : gimple_opt_pass (pass_data_adjust_alignment, ctxt)
      51              :   {}
      52              : 
      53              :   unsigned int execute (function *) final override;
      54              : }; // class pass_adjust_alignment
      55              : 
      56              : } // anon namespace
      57              : 
      58              : /* Entry point to adjust_alignment pass.  */
      59              : unsigned int
      60      1472174 : pass_adjust_alignment::execute (function *fun)
      61              : {
      62      1472174 :   size_t i;
      63      1472174 :   tree var;
      64              : 
      65     10737312 :   FOR_EACH_LOCAL_DECL (fun, i, var)
      66              :     {
      67              :       /* Don't adjust aligment for static local var and hard register var.  */
      68      8035726 :       if (is_global_var (var) || DECL_HARD_REGISTER (var))
      69       234935 :         continue;
      70              : 
      71      7800791 :       unsigned align = LOCAL_DECL_ALIGNMENT (var);
      72              : 
      73              :       /* Make sure alignment only increase.  */
      74      7800791 :       gcc_assert (align >= DECL_ALIGN (var));
      75              : 
      76      7800791 :       SET_DECL_ALIGN (var, align);
      77              :     }
      78      1472174 :   return 0;
      79              : }
      80              : 
      81              : gimple_opt_pass *
      82       285722 : make_pass_adjust_alignment (gcc::context *ctxt)
      83              : {
      84       285722 :   return new pass_adjust_alignment (ctxt);
      85              : }