gcc/common/config/avr/avr-common.cc

   1 /* Common hooks for ATMEL AVR.
   2    Copyright (C) 1998-2024 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
   7    it under the terms of the GNU General Public License as published by
   8    the Free Software Foundation; either version 3, or (at your option)
   9    any later version.
  10
  11    GCC is distributed in the hope that it will be useful,
  12    but WITHOUT ANY WARRANTY; without even the implied warranty of
  13    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  14    GNU General Public License 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 #include "config.h"
  21 #include "system.h"
  22 #include "coretypes.h"
  23 #include "tm.h"
  24 #include "common/common-target.h"
  25 #include "common/common-target-def.h"
  26 #include "opts.h"
  27 #include "diagnostic.h"
  28
  29 /* Implement TARGET_OPTION_OPTIMIZATION_TABLE.  */
  30 static const struct default_options avr_option_optimization_table[] =
  31   {
  32     // The only effect of -fcaller-saves might be that it triggers
  33     // a frame without need when it tries to be smart around calls.
  34     { OPT_LEVELS_ALL, OPT_fcaller_saves, NULL, 0 },
  35     { OPT_LEVELS_1_PLUS_NOT_DEBUG, OPT_mgas_isr_prologues, NULL, 1 },
  36     { OPT_LEVELS_1_PLUS, OPT_mmain_is_OS_task, NULL, 1 },
  37     // Stick to the "old" placement of the subreg lowering pass.
  38     { OPT_LEVELS_1_PLUS, OPT_fsplit_wide_types_early, NULL, 1 },
  39     /* Allow optimizer to introduce store data races. This used to be the
  40        default -- it was changed because bigger targets did not see any
  41        performance decrease. For the AVR though, disallowing data races
  42        introduces additional code in LIM and increases reg pressure.  */
  43     { OPT_LEVELS_ALL, OPT_fallow_store_data_races, NULL, 1 },
  44
  45 #if defined (WITH_DOUBLE64)
  46     { OPT_LEVELS_ALL, OPT_mdouble_, NULL, 64 },
  47 #elif defined (WITH_DOUBLE32)
  48     { OPT_LEVELS_ALL, OPT_mdouble_, NULL, 32 },
  49 #else
  50 #error "align this with config.gcc"
  51 #endif
  52
  53 #if defined (WITH_LONG_DOUBLE64)
  54     { OPT_LEVELS_ALL, OPT_mlong_double_, NULL, 64 },
  55 #elif defined (WITH_LONG_DOUBLE32)
  56     { OPT_LEVELS_ALL, OPT_mlong_double_, NULL, 32 },
  57 #else
  58 #error "align this with config.gcc"
  59 #endif
  60
  61     { OPT_LEVELS_NONE, 0, NULL, 0 }
  62   };
  63
  64
  65 /* Implement `TARGET_HANDLE_OPTION'.  */
  66
  67 /* This is the same logic that driver-avr.cc:avr_double_lib() applies
  68    during DRIVER_SELF_SPECS, but this time we complain about -mdouble=
  69    and -mlong-double= that are not provided by --with-double= resp.
  70    --with-long-double=  */
  71
  72 static bool
  73 avr_handle_option (struct gcc_options *opts, struct gcc_options*,
  74                    const struct cl_decoded_option *decoded,
  75                    location_t loc ATTRIBUTE_UNUSED)
  76 {
  77   int value = decoded->value;
  78
  79   switch (decoded->opt_index)
  80     {
  81     case OPT_mdouble_:
  82       if (value == 64)
  83         {
  84 #if !defined (HAVE_DOUBLE64)
  85           error_at (loc, "option %<-mdouble=64%> is only available if "
  86                     "configured %<--with-double={64|64,32|32,64}%>");
  87 #endif
  88           opts->x_avr_long_double = 64;
  89         }
  90       else if (value == 32)
  91         {
  92 #if !defined (HAVE_DOUBLE32)
  93           error_at (loc, "option %<-mdouble=32%> is only available if "
  94                     "configured %<--with-double={32|32,64|64,32}%>");
  95 #endif
  96         }
  97       else
  98         gcc_unreachable();
  99
 100 #if defined (HAVE_LONG_DOUBLE_IS_DOUBLE)
 101       opts->x_avr_long_double = value;
 102 #endif
 103       break; // -mdouble=
 104
 105     case OPT_mlong_double_:
 106       if (value == 64)
 107         {
 108 #if !defined (HAVE_LONG_DOUBLE64)
 109           error_at (loc, "option %<-mlong-double=64%> is only available if "
 110                     "configured %<--with-long-double={64|64,32|32,64}%>, "
 111                     "or %<--with-long-double=double%> together with "
 112                     "%<--with-double={64|64,32|32,64}%>");
 113 #endif
 114         }
 115       else if (value == 32)
 116         {
 117 #if !defined (HAVE_LONG_DOUBLE32)
 118           error_at (loc, "option %<-mlong-double=32%> is only available if "
 119                     "configured %<--with-long-double={32|32,64|64,32}%>, "
 120                     "or %<--with-long-double=double%> together with "
 121                     "%<--with-double={32|32,64|64,32}%>");
 122 #endif
 123           opts->x_avr_double = 32;
 124         }
 125       else
 126         gcc_unreachable();
 127
 128 #if defined (HAVE_LONG_DOUBLE_IS_DOUBLE)
 129       opts->x_avr_double = value;
 130 #endif
 131       break; // -mlong-double=
 132     }
 133
 134   return true;
 135 }
 136
 137
 138 #undef TARGET_HANDLE_OPTION
 139 #define TARGET_HANDLE_OPTION avr_handle_option
 140
 141 #undef TARGET_OPTION_OPTIMIZATION_TABLE
 142 #define TARGET_OPTION_OPTIMIZATION_TABLE avr_option_optimization_table
 143
 144 #undef TARGET_EXCEPT_UNWIND_INFO
 145 #define TARGET_EXCEPT_UNWIND_INFO sjlj_except_unwind_info
 146
 147 struct gcc_targetm_common targetm_common = TARGETM_COMMON_INITIALIZER;