gcc/config/i386/i386-c.c

   1 /* Subroutines used for macro/preprocessor support on the ia-32.
   2    Copyright (C) 2008
   3    Free Software Foundation, Inc.
   4
   5 This file is part of GCC.
   6
   7 GCC is free software; you can redistribute it and/or modify
   8 it under the terms of the GNU General Public License as published by
   9 the Free Software Foundation; either version 3, or (at your option)
  10 any later version.
  11
  12 GCC is distributed in the hope that it will be useful,
  13 but WITHOUT ANY WARRANTY; without even the implied warranty of
  14 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  15 GNU General Public License 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 "tm.h"
  25 #include "rtl.h"
  26 #include "tree.h"
  27 #include "tm_p.h"
  28 #include "flags.h"
  29 #include "c-common.h"
  30 #include "ggc.h"
  31 #include "target.h"
  32 #include "target-def.h"
  33 #include "cpplib.h"
  34 #include "c-pragma.h"
  35
  36 static bool ix86_pragma_option_parse (tree);
  37 static void ix86_target_macros_internal
  38   (int, enum processor_type, enum processor_type, enum fpmath_unit,
  39    void (*def_or_undef) (cpp_reader *, const char *));
  40
  41 \f
  42 /* Internal function to either define or undef the appropriate system
  43    macros.  */
  44 static void
  45 ix86_target_macros_internal (int isa_flag,
  46                              enum processor_type arch,
  47                              enum processor_type tune,
  48                              enum fpmath_unit fpmath,
  49                              void (*def_or_undef) (cpp_reader *,
  50                                                    const char *))
  51 {
  52   /* For some of the k6/pentium varients there weren't seperate ISA bits to
  53      identify which tune/arch flag was passed, so figure it out here.  */
  54   size_t arch_len = strlen (ix86_arch_string);
  55   size_t tune_len = strlen (ix86_tune_string);
  56   int last_arch_char = ix86_arch_string[arch_len - 1];
  57   int last_tune_char = ix86_tune_string[tune_len - 1];
  58
  59   /* Built-ins based on -march=.  */
  60   switch (arch)
  61     {
  62     case PROCESSOR_I386:
  63       break;
  64     case PROCESSOR_I486:
  65       def_or_undef (parse_in, "__i486");
  66       def_or_undef (parse_in, "__i486__");
  67       break;
  68     case PROCESSOR_PENTIUM:
  69       def_or_undef (parse_in, "__i586");
  70       def_or_undef (parse_in, "__i586__");
  71       def_or_undef (parse_in, "__pentium");
  72       def_or_undef (parse_in, "__pentium__");
  73       if (isa_flag & OPTION_MASK_ISA_MMX)
  74         def_or_undef (parse_in, "__pentium_mmx__");
  75       break;
  76     case PROCESSOR_PENTIUMPRO:
  77       def_or_undef (parse_in, "__i686");
  78       def_or_undef (parse_in, "__i686__");
  79       def_or_undef (parse_in, "__pentiumpro");
  80       def_or_undef (parse_in, "__pentiumpro__");
  81       break;
  82     case PROCESSOR_GEODE:
  83       def_or_undef (parse_in, "__geode");
  84       def_or_undef (parse_in, "__geode__");
  85       break;
  86     case PROCESSOR_K6:
  87       def_or_undef (parse_in, "__k6");
  88       def_or_undef (parse_in, "__k6__");
  89       if (last_arch_char == '2')
  90         def_or_undef (parse_in, "__k6_2__");
  91       else if (last_arch_char == '3')
  92         def_or_undef (parse_in, "__k6_3__");
  93       else if (isa_flag & OPTION_MASK_ISA_3DNOW)
  94         def_or_undef (parse_in, "__k6_3__");
  95       break;
  96     case PROCESSOR_ATHLON:
  97       def_or_undef (parse_in, "__athlon");
  98       def_or_undef (parse_in, "__athlon__");
  99       if (isa_flag & OPTION_MASK_ISA_SSE)
 100         def_or_undef (parse_in, "__athlon_sse__");
 101       break;
 102     case PROCESSOR_K8:
 103       def_or_undef (parse_in, "__k8");
 104       def_or_undef (parse_in, "__k8__");
 105       break;
 106     case PROCESSOR_AMDFAM10:
 107       def_or_undef (parse_in, "__amdfam10");
 108       def_or_undef (parse_in, "__amdfam10__");
 109       break;
 110     case PROCESSOR_PENTIUM4:
 111       def_or_undef (parse_in, "__pentium4");
 112       def_or_undef (parse_in, "__pentium4__");
 113       break;
 114     case PROCESSOR_NOCONA:
 115       def_or_undef (parse_in, "__nocona");
 116       def_or_undef (parse_in, "__nocona__");
 117       break;
 118     case PROCESSOR_CORE2:
 119       def_or_undef (parse_in, "__core2");
 120       def_or_undef (parse_in, "__core2__");
 121       break;
 122     /* use PROCESSOR_max to not set/unset the arch macro.  */
 123     case PROCESSOR_max:
 124       break;
 125     case PROCESSOR_GENERIC32:
 126     case PROCESSOR_GENERIC64:
 127       gcc_unreachable ();
 128     }
 129
 130   /* Built-ins based on -mtune=.  */
 131   switch (tune)
 132     {
 133     case PROCESSOR_I386:
 134       def_or_undef (parse_in, "__tune_i386__");
 135       break;
 136     case PROCESSOR_I486:
 137       def_or_undef (parse_in, "__tune_i486__");
 138       break;
 139     case PROCESSOR_PENTIUM:
 140       def_or_undef (parse_in, "__tune_i586__");
 141       def_or_undef (parse_in, "__tune_pentium__");
 142       if (last_tune_char == 'x')
 143         def_or_undef (parse_in, "__tune_pentium_mmx__");
 144       break;
 145     case PROCESSOR_PENTIUMPRO:
 146       def_or_undef (parse_in, "__tune_i686__");
 147       def_or_undef (parse_in, "__tune_pentiumpro__");
 148       switch (last_tune_char)
 149         {
 150         case '3':
 151           def_or_undef (parse_in, "__tune_pentium3__");
 152           /* FALLTHRU */
 153         case '2':
 154           def_or_undef (parse_in, "__tune_pentium2__");
 155           break;
 156         }
 157       break;
 158     case PROCESSOR_GEODE:
 159       def_or_undef (parse_in, "__tune_geode__");
 160       break;
 161     case PROCESSOR_K6:
 162       def_or_undef (parse_in, "__tune_k6__");
 163       if (last_tune_char == '2')
 164         def_or_undef (parse_in, "__tune_k6_2__");
 165       else if (last_tune_char == '3')
 166         def_or_undef (parse_in, "__tune_k6_3__");
 167       else if (isa_flag & OPTION_MASK_ISA_3DNOW)
 168         def_or_undef (parse_in, "__tune_k6_3__");
 169       break;
 170     case PROCESSOR_ATHLON:
 171       def_or_undef (parse_in, "__tune_athlon__");
 172       if (isa_flag & OPTION_MASK_ISA_SSE)
 173         def_or_undef (parse_in, "__tune_athlon_sse__");
 174       break;
 175     case PROCESSOR_K8:
 176       def_or_undef (parse_in, "__tune_k8__");
 177       break;
 178     case PROCESSOR_AMDFAM10:
 179       def_or_undef (parse_in, "__tune_amdfam10__");
 180       break;
 181     case PROCESSOR_PENTIUM4:
 182       def_or_undef (parse_in, "__tune_pentium4__");
 183       break;
 184     case PROCESSOR_NOCONA:
 185       def_or_undef (parse_in, "__tune_nocona__");
 186       break;
 187     case PROCESSOR_CORE2:
 188       def_or_undef (parse_in, "__tune_core2__");
 189       break;
 190     case PROCESSOR_GENERIC32:
 191     case PROCESSOR_GENERIC64:
 192       break;
 193     /* use PROCESSOR_max to not set/unset the tune macro.  */
 194     case PROCESSOR_max:
 195       break;
 196     }
 197
 198   if (isa_flag & OPTION_MASK_ISA_MMX)
 199     def_or_undef (parse_in, "__MMX__");
 200   if (isa_flag & OPTION_MASK_ISA_3DNOW)
 201     def_or_undef (parse_in, "__3dNOW__");
 202   if (isa_flag & OPTION_MASK_ISA_3DNOW_A)
 203     def_or_undef (parse_in, "__3dNOW_A__");
 204   if (isa_flag & OPTION_MASK_ISA_SSE)
 205     def_or_undef (parse_in, "__SSE__");
 206   if (isa_flag & OPTION_MASK_ISA_SSE2)
 207     def_or_undef (parse_in, "__SSE2__");
 208   if (isa_flag & OPTION_MASK_ISA_SSE3)
 209     def_or_undef (parse_in, "__SSE3__");
 210   if (isa_flag & OPTION_MASK_ISA_SSSE3)
 211     def_or_undef (parse_in, "__SSSE3__");
 212   if (isa_flag & OPTION_MASK_ISA_SSE4_1)
 213     def_or_undef (parse_in, "__SSE4_1__");
 214   if (isa_flag & OPTION_MASK_ISA_SSE4_2)
 215     def_or_undef (parse_in, "__SSE4_2__");
 216   if (isa_flag & OPTION_MASK_ISA_AES)
 217     def_or_undef (parse_in, "__AES__");
 218   if (isa_flag & OPTION_MASK_ISA_PCLMUL)
 219     def_or_undef (parse_in, "__PCLMUL__");
 220   if (isa_flag & OPTION_MASK_ISA_SSE4A)
 221     def_or_undef (parse_in, "__SSE4A__");
 222   if (isa_flag & OPTION_MASK_ISA_SSE5)
 223     def_or_undef (parse_in, "__SSE5__");
 224   if ((fpmath & FPMATH_SSE) && (isa_flag & OPTION_MASK_ISA_SSE))
 225     def_or_undef (parse_in, "__SSE_MATH__");
 226   if ((fpmath & FPMATH_SSE) && (isa_flag & OPTION_MASK_ISA_SSE2))
 227     def_or_undef (parse_in, "__SSE2_MATH__");
 228 }
 229
 230 \f
 231 /* Hook to validate the current #pragma option and set the state, and update
 232    the macros based on what was changed.  */
 233
 234 static bool
 235 ix86_pragma_option_parse (tree args)
 236 {
 237   tree prev_tree = build_target_option_node ();
 238   tree cur_tree;
 239   struct cl_target_option *prev_opt;
 240   struct cl_target_option *cur_opt;
 241   int prev_isa;
 242   int cur_isa;
 243   int diff_isa;
 244   enum processor_type prev_arch;
 245   enum processor_type prev_tune;
 246   enum processor_type cur_arch;
 247   enum processor_type cur_tune;
 248
 249   if (! args)
 250     {
 251       cur_tree = target_option_default_node;
 252       cl_target_option_restore (TREE_TARGET_OPTION (cur_tree));
 253     }
 254   else
 255     {
 256       cur_tree = ix86_valid_option_attribute_tree (args);
 257       if (!cur_tree)
 258         return false;
 259     }
 260
 261   target_option_current_node = cur_tree;
 262
 263   /* Figure out the previous/current isa, arch, tune and the differences.  */
 264   prev_opt  = TREE_TARGET_OPTION (prev_tree);
 265   cur_opt   = TREE_TARGET_OPTION (cur_tree);
 266   prev_isa  = prev_opt->ix86_isa_flags;
 267   cur_isa   = cur_opt->ix86_isa_flags;
 268   diff_isa  = (prev_isa ^ cur_isa);
 269   prev_arch = prev_opt->arch;
 270   prev_tune = prev_opt->tune;
 271   cur_arch  = cur_opt->arch;
 272   cur_tune  = cur_opt->tune;
 273
 274   /* If the same processor is used for both previous and current options, don't
 275      change the macros.  */
 276   if (cur_arch == prev_arch)
 277     cur_arch = prev_arch = PROCESSOR_max;
 278
 279   if (cur_tune == prev_tune)
 280     cur_tune = prev_tune = PROCESSOR_max;
 281
 282   /* Undef all of the macros for that are no longer current.  */
 283   ix86_target_macros_internal (prev_isa & diff_isa,
 284                                prev_arch,
 285                                prev_tune,
 286                                prev_opt->fpmath,
 287                                cpp_undef);
 288
 289   /* Define all of the macros for new options that were just turned on.  */
 290   ix86_target_macros_internal (cur_isa & diff_isa,
 291                                cur_arch,
 292                                cur_tune,
 293                                cur_opt->fpmath,
 294                                cpp_define);
 295
 296   return true;
 297 }
 298 \f
 299 /* Function to tell the preprocessor about the defines for the current target.  */
 300
 301 void
 302 ix86_target_macros (void)
 303 {
 304   /* 32/64-bit won't change with target specific options, so do the assert and
 305      builtin_define_std calls here.  */
 306   if (TARGET_64BIT)
 307     {
 308       cpp_assert (parse_in, "cpu=x86_64");
 309       cpp_assert (parse_in, "machine=x86_64");
 310       cpp_define (parse_in, "__amd64");
 311       cpp_define (parse_in, "__amd64__");
 312       cpp_define (parse_in, "__x86_64");
 313       cpp_define (parse_in, "__x86_64__");
 314     }
 315   else
 316     {
 317       cpp_assert (parse_in, "cpu=i386");
 318       cpp_assert (parse_in, "machine=i386");
 319       builtin_define_std ("i386");
 320     }
 321
 322   ix86_target_macros_internal (ix86_isa_flags,
 323                                ix86_arch,
 324                                ix86_tune,
 325                                ix86_fpmath,
 326                                cpp_define);
 327 }
 328
 329 \f
 330 /* Register target pragmas.  We need to add the hook for parsing #pragma GCC
 331    option here rather than in i386.c since it will pull in various preprocessor
 332    functions, and those are not present in languages like fortran without a
 333    preprocessor.  */
 334
 335 void
 336 ix86_register_pragmas (void)
 337 {
 338   /* Update pragma hook to allow parsing #pragma GCC option.  */
 339   targetm.target_option.pragma_parse = ix86_pragma_option_parse;
 340
 341 #ifdef REGISTER_SUBTARGET_PRAGMAS
 342   REGISTER_SUBTARGET_PRAGMAS ();
 343 #endif
 344 }