gcc/config/mmix/mmix.h

   1 /* Definitions of target machine for GNU compiler, for MMIX.
   2    Copyright (C) 2000, 2001, 2002, 2004, 2005, 2007, 2008
   3    Free Software Foundation, Inc.
   4    Contributed by Hans-Peter Nilsson (hp@bitrange.com)
   5
   6 This file is part of GCC.
   7
   8 GCC is free software; you can redistribute it and/or modify
   9 it under the terms of the GNU General Public License as published by
  10 the Free Software Foundation; either version 3, or (at your option)
  11 any later version.
  12
  13 GCC is distributed in the hope that it will be useful,
  14 but WITHOUT ANY WARRANTY; without even the implied warranty of
  15 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  16 GNU General Public License for more details.
  17
  18 You should have received a copy of the GNU General Public License
  19 along with GCC; see the file COPYING3.  If not see
  20 <http://www.gnu.org/licenses/>.  */
  21
  22 #ifndef GCC_MMIX_H
  23 #define GCC_MMIX_H
  24
  25 /* First, some local helper macros.  Note that the "default" value of
  26    FIXED_REGISTERS, CALL_USED_REGISTERS, REG_ALLOC_ORDER and
  27    REG_CLASS_CONTENTS depend on these values.  */
  28 #define MMIX_RESERVED_GNU_ARG_0_REGNUM 231
  29 #define MMIX_FIRST_ARG_REGNUM \
  30   (TARGET_ABI_GNU ? MMIX_RESERVED_GNU_ARG_0_REGNUM : 16)
  31 #define MMIX_FIRST_INCOMING_ARG_REGNUM \
  32   (TARGET_ABI_GNU ? MMIX_RESERVED_GNU_ARG_0_REGNUM : 0)
  33 #define MMIX_MAX_ARGS_IN_REGS 16
  34
  35 /* FIXME: This one isn't fully implemented yet.  Return values larger than
  36    one register are passed by reference in MMIX_STRUCT_VALUE_REGNUM by the
  37    caller, except for return values of type "complex".  */
  38 #define MMIX_MAX_REGS_FOR_VALUE 16
  39 #define MMIX_RETURN_VALUE_REGNUM \
  40   (TARGET_ABI_GNU ? MMIX_RESERVED_GNU_ARG_0_REGNUM : 15)
  41 #define MMIX_OUTGOING_RETURN_VALUE_REGNUM \
  42   (TARGET_ABI_GNU ? MMIX_RESERVED_GNU_ARG_0_REGNUM : 0)
  43 #define MMIX_STRUCT_VALUE_REGNUM 251
  44 #define MMIX_STATIC_CHAIN_REGNUM 252
  45 #define MMIX_FRAME_POINTER_REGNUM 253
  46 #define MMIX_STACK_POINTER_REGNUM 254
  47 #define MMIX_LAST_GENERAL_REGISTER 255
  48 #define MMIX_INCOMING_RETURN_ADDRESS_REGNUM MMIX_rJ_REGNUM
  49 #define MMIX_HIMULT_REGNUM 258
  50 #define MMIX_REMAINDER_REGNUM MMIX_rR_REGNUM
  51 #define MMIX_ARG_POINTER_REGNUM 261
  52 #define MMIX_rO_REGNUM 262
  53 #define MMIX_LAST_STACK_REGISTER_REGNUM 31
  54
  55 /* Four registers; "ideally, these registers should be call-clobbered", so
  56    just grab a bunch of the common clobbered registers.  FIXME: Last
  57    registers of return-value should be used, with an error if there's a
  58    return-value (that collides in size).  */
  59 #define MMIX_EH_RETURN_DATA_REGNO_START (MMIX_STRUCT_VALUE_REGNUM - 4)
  60
  61 /* Try to keep the definitions from running away on their own.  */
  62 #if (MMIX_EH_RETURN_DATA_REGNO_START \
  63      != MMIX_RESERVED_GNU_ARG_0_REGNUM + MMIX_MAX_ARGS_IN_REGS)
  64  #error MMIX register definition inconsistency
  65 #endif
  66
  67 #if (MMIX_MAX_REGS_FOR_VALUE + MMIX_MAX_ARGS_IN_REGS > 32)
  68  #error MMIX parameters and return values bad, more than 32 registers
  69 #endif
  70
  71 /* This chosen as "a call-clobbered hard register that is otherwise
  72    untouched by the epilogue".  */
  73 #define MMIX_EH_RETURN_STACKADJ_REGNUM MMIX_STATIC_CHAIN_REGNUM
  74
  75 #ifdef REG_OK_STRICT
  76 # define MMIX_REG_OK_STRICT 1
  77 #else
  78 # define MMIX_REG_OK_STRICT 0
  79 #endif
  80
  81 #define MMIX_FUNCTION_ARG_SIZE(MODE, TYPE) \
  82  ((MODE) != BLKmode ? GET_MODE_SIZE (MODE) : int_size_in_bytes (TYPE))
  83
  84 /* Declarations for helper variables that are not tied to a particular
  85    target macro.  */
  86 extern GTY(()) rtx mmix_compare_op0;
  87 extern GTY(()) rtx mmix_compare_op1;
  88
  89 /* Per-function machine data.  This is normally an opaque type just
  90    defined and used in the tm.c file, but we need to see the definition in
  91    mmix.md too.  */
  92 struct machine_function GTY(())
  93  {
  94    int has_landing_pad;
  95    int highest_saved_stack_register;
  96    int in_prologue;
  97  };
  98
  99 /* For these target macros, there is no generic documentation here.  You
 100    should read `Using and Porting GCC' for that.  Only comments specific
 101    to the MMIX target are here.
 102
 103    There are however references to the specific texinfo node (comments
 104    with "Node:"), so there should be little or nothing amiss.  Probably
 105    the opposite, since we don't have to care about old littering and
 106    soon outdated generic comments.  */
 107
 108 /* Node: Driver */
 109
 110 /* User symbols are in the same name-space as built-in symbols, but we
 111    don't need the built-in symbols, so remove those and instead apply
 112    stricter operand checking.  Don't warn when expanding insns.  */
 113 #define ASM_SPEC "-no-predefined-syms -x"
 114
 115 /* Pass on -mset-program-start=N and -mset-data-start=M to the linker.
 116    Provide default program start 0x100 unless -mno-set-program-start.
 117    Don't do this if linking relocatably, with -r.  For a final link,
 118    produce mmo, unless ELF is requested or when linking relocatably.  */
 119 #define LINK_SPEC \
 120  "%{mset-program-start=*:--defsym __.MMIX.start..text=%*}\
 121   %{mset-data-start=*:--defsym __.MMIX.start..data=%*}\
 122   %{!mset-program-start=*:\
 123     %{!mno-set-program-start:\
 124      %{!r:--defsym __.MMIX.start..text=0x100}}}\
 125   %{!melf:%{!r:-m mmo}}%{melf|r:-m elf64mmix}"
 126
 127 /* FIXME: There's no provision for profiling here.  */
 128 #define STARTFILE_SPEC  \
 129   "crti%O%s crtbegin%O%s"
 130
 131 #define ENDFILE_SPEC "crtend%O%s crtn%O%s"
 132
 133 /* Node: Run-time Target */
 134
 135 /* Define __LONG_MAX__, since we're advised not to change glimits.h.  */
 136 #define TARGET_CPU_CPP_BUILTINS()                               \
 137   do                                                            \
 138     {                                                           \
 139       builtin_define ("__mmix__");                              \
 140       builtin_define ("__MMIX__");                              \
 141       if (TARGET_ABI_GNU)                                       \
 142         builtin_define ("__MMIX_ABI_GNU__");                    \
 143       else                                                      \
 144         builtin_define ("__MMIX_ABI_MMIXWARE__");               \
 145     }                                                           \
 146   while (0)
 147
 148 extern int target_flags;
 149
 150 #define TARGET_DEFAULT \
 151  (MASK_BRANCH_PREDICT | MASK_BASE_ADDRESSES | MASK_USE_RETURN_INSN)
 152
 153 /* Unfortunately, this must not reference anything in "mmix.c".  */
 154 #define TARGET_VERSION \
 155   fprintf (stderr, " (MMIX)")
 156
 157 #define OVERRIDE_OPTIONS mmix_override_options ()
 158
 159 #define OPTIMIZATION_OPTIONS(LEVEL, SIZE)       \
 160   do                                            \
 161     {                                           \
 162       if (LEVEL >= 1)                           \
 163         flag_regmove = TRUE;                    \
 164                                                 \
 165       if (SIZE || LEVEL > 1)                    \
 166         {                                       \
 167           flag_omit_frame_pointer = TRUE;       \
 168         }                                       \
 169     }                                           \
 170   while (0)
 171
 172 /* This one will have to wait a little bit; right now we can't debug
 173    neither with or without a frame-pointer.  */
 174 /* #define CAN_DEBUG_WITHOUT_FP */
 175
 176
 177 /* Node: Per-Function Data */
 178 #define INIT_EXPANDERS mmix_init_expanders ()
 179
 180
 181 /* Node: Storage Layout */
 182 /* I see no bit-field instructions.  Anyway, the common order is from low
 183    to high, as the power of two, hence little-endian.  */
 184 #define BITS_BIG_ENDIAN 0
 185 #define BYTES_BIG_ENDIAN 1
 186 #define WORDS_BIG_ENDIAN 1
 187 #define FLOAT_WORDS_BIG_ENDIAN 1
 188 #define UNITS_PER_WORD 8
 189
 190 /* FIXME: Promotion of modes currently generates slow code, extending
 191    before every operation.  */
 192 /* I'm a little bit undecided about this one.  It might be beneficial to
 193    promote all operations.  */
 194
 195 #define PROMOTE_FUNCTION_MODE(MODE, UNSIGNEDP, TYPE)    \
 196  do {                                           \
 197   if (GET_MODE_CLASS (MODE) == MODE_INT         \
 198       && GET_MODE_SIZE (MODE) < 8)              \
 199    {                                            \
 200      (MODE) = DImode;                           \
 201      /* Do the following some time later,       \
 202         scrutinizing differences.  */           \
 203      if (0) (UNSIGNEDP) = 0;                    \
 204    }                                            \
 205  } while (0)
 206
 207 /* We need to align everything to 64 bits that can affect the alignment
 208    of other types.  Since address N is interpreted in MMIX as (N modulo
 209    access_size), we must align.  */
 210 #define PARM_BOUNDARY 64
 211 #define STACK_BOUNDARY 64
 212 #define FUNCTION_BOUNDARY 32
 213 #define BIGGEST_ALIGNMENT 64
 214
 215 /* This one is only used in the ADA front end.  */
 216 #define MINIMUM_ATOMIC_ALIGNMENT 8
 217
 218 /* Copied from elfos.h.  */
 219 #define MAX_OFILE_ALIGNMENT (32768 * 8)
 220
 221 #define DATA_ALIGNMENT(TYPE, BASIC_ALIGN) \
 222  mmix_data_alignment (TYPE, BASIC_ALIGN)
 223
 224 #define CONSTANT_ALIGNMENT(CONSTANT, BASIC_ALIGN) \
 225  mmix_constant_alignment (CONSTANT, BASIC_ALIGN)
 226
 227 #define LOCAL_ALIGNMENT(TYPE, BASIC_ALIGN) \
 228  mmix_local_alignment (TYPE, BASIC_ALIGN)
 229
 230 /* Following other ports, this seems to most commonly be the word-size,
 231    so let's do that here too.  */
 232 #define EMPTY_FIELD_BOUNDARY 64
 233
 234 /* We chose to have this low solely for similarity with the alpha.  It has
 235    nothing to do with passing the tests dg/c99-scope-2 and
 236    execute/align-1.c.  Nothing.  Though the tests seem wrong.  Padding of
 237    the structure is automatically added to get alignment when needed if we
 238    set this to just byte-boundary.  */
 239 #define STRUCTURE_SIZE_BOUNDARY 8
 240
 241 /* The lower bits are ignored.  */
 242 #define STRICT_ALIGNMENT 1
 243
 244
 245 /* Node: Type Layout */
 246
 247 /* It might seem more natural to have 64-bit ints on a 64-bit machine,
 248    but then an occasional MMIX programmer needs to know how to put a lot
 249    of __attribute__ stuff to get to the 8, 16 and 32-bit modes rather
 250    than the "intuitive" char, short and int types.  */
 251 #define INT_TYPE_SIZE 32
 252 #define SHORT_TYPE_SIZE 16
 253 #define LONG_LONG_TYPE_SIZE 64
 254
 255 #define FLOAT_TYPE_SIZE 32
 256 #define DOUBLE_TYPE_SIZE 64
 257 #define LONG_DOUBLE_TYPE_SIZE 64
 258
 259 #define DEFAULT_SIGNED_CHAR 1
 260
 261
 262 /* Node: Register Basics */
 263 /* We tell GCC about all 256 general registers, and we also include
 264    rD, rE, rH, rJ, rR and rO (in that order) so we can describe what insns
 265    clobber them.  We use a faked register for the argument pointer.  It is
 266    always eliminated towards the frame-pointer or the stack-pointer, never
 267    output in assembly.  Any fixed register would do for this, like $255,
 268    but future debugging is easier when using a separate register.  It
 269    counts as a global register for pseudorandom reasons.  */
 270 #define FIRST_PSEUDO_REGISTER 263
 271
 272 /* We treat general registers with no assigned purpose as fixed.  The
 273    stack pointer, $254, is also fixed.  Register $255 is referred to as a
 274    temporary register in the MMIX papers, and used as such in mmixal, so
 275    it should not be used as a stack pointer.  We set it to fixed, and use
 276    it "manually" at times of despair.  */
 277 #define FIXED_REGISTERS \
 278  { 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, \
 279    0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, \
 280    1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, \
 281    1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, \
 282    1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, \
 283    1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, \
 284    1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, \
 285    1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, \
 286    1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, \
 287    1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, \
 288    1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, \
 289    1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, \
 290    1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, \
 291    1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, \
 292    1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, \
 293    1, 1, 1, 1, 1, 1, 1, 0, 0, 0, 0, 0, 0, 0, 1, 1, \
 294    1, 1, 0, 0, 0, 1, 1 \
 295  }
 296
 297 /* General registers are fixed and therefore "historically" marked
 298    call-used.  (FIXME: This has changed).  Registers $15..$31 are
 299    call-clobbered; we'll put arguments in $16 and up, and we need $15 for
 300    the MMIX register-stack "hole".  */
 301 #define CALL_USED_REGISTERS \
 302  { 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 1, \
 303    1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, \
 304    1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, \
 305    1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, \
 306    1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, \
 307    1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, \
 308    1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, \
 309    1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, \
 310    1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, \
 311    1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, \
 312    1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, \
 313    1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, \
 314    1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, \
 315    1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, \
 316    1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, \
 317    1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 0, 1, 1, \
 318    1, 1, 1, 1, 1, 1, 1 \
 319  }
 320
 321 #define CONDITIONAL_REGISTER_USAGE mmix_conditional_register_usage ()
 322
 323 #define INCOMING_REGNO(OUT) mmix_opposite_regno (OUT, 0)
 324
 325 #define OUTGOING_REGNO(IN) mmix_opposite_regno (IN, 1)
 326
 327 /* Defining LOCAL_REGNO is necessary in presence of prologue/epilogue,
 328    else GCC will be confused that those registers aren't saved and
 329    restored.  */
 330 #define LOCAL_REGNO(REGNO) mmix_local_regno (REGNO)
 331
 332 /* Node: Allocation Order */
 333
 334 /* We should allocate registers from 0 to 31 by increasing number, because
 335    I think that's what people expect.  Beyond that, just use
 336    call-clobbered global registers first, then call-clobbered special
 337    registers.  Last, the fixed registers.  */
 338 #define MMIX_MMIXWARE_ABI_REG_ALLOC_ORDER       \
 339  { 0, 1, 2, 3, 4, 5, 6, 7,                      \
 340    8, 9, 10, 11, 12, 13, 14, 15,                \
 341    16, 17, 18, 19, 20, 21, 22, 23,              \
 342    24, 25, 26, 27, 28, 29, 30, 31,              \
 343                                                 \
 344    252, 251, 250, 249, 248, 247,                \
 345                                                 \
 346    253,                                         \
 347                                                 \
 348    258, 260, 259,                               \
 349                                                 \
 350    32, 33, 34, 35, 36, 37, 38, 39,              \
 351    40, 41, 42, 43, 44, 45, 46, 47,              \
 352    48, 49, 50, 51, 52, 53, 54, 55,              \
 353    56, 57, 58, 59, 60, 61, 62, 63,              \
 354    64, 65, 66, 67, 68, 69, 70, 71,              \
 355    72, 73, 74, 75, 76, 77, 78, 79,              \
 356    80, 81, 82, 83, 84, 85, 86, 87,              \
 357    88, 89, 90, 91, 92, 93, 94, 95,              \
 358    96, 97, 98, 99, 100, 101, 102, 103,          \
 359    104, 105, 106, 107, 108, 109, 110, 111,      \
 360    112, 113, 114, 115, 116, 117, 118, 119,      \
 361    120, 121, 122, 123, 124, 125, 126, 127,      \
 362    128, 129, 130, 131, 132, 133, 134, 135,      \
 363    136, 137, 138, 139, 140, 141, 142, 143,      \
 364    144, 145, 146, 147, 148, 149, 150, 151,      \
 365    152, 153, 154, 155, 156, 157, 158, 159,      \
 366    160, 161, 162, 163, 164, 165, 166, 167,      \
 367    168, 169, 170, 171, 172, 173, 174, 175,      \
 368    176, 177, 178, 179, 180, 181, 182, 183,      \
 369    184, 185, 186, 187, 188, 189, 190, 191,      \
 370    192, 193, 194, 195, 196, 197, 198, 199,      \
 371    200, 201, 202, 203, 204, 205, 206, 207,      \
 372    208, 209, 210, 211, 212, 213, 214, 215,      \
 373    216, 217, 218, 219, 220, 221, 222, 223,      \
 374    224, 225, 226, 227, 228, 229, 230, 231,      \
 375    232, 233, 234, 235, 236, 237, 238, 239,      \
 376    240, 241, 242, 243, 244, 245, 246,           \
 377                                                 \
 378    254, 255, 256, 257, 261, 262                 \
 379  }
 380
 381 /* As a convenience, we put this nearby, for ease of comparison.
 382    First, call-clobbered registers in reverse order of assignment as
 383    parameters (also the top ones; not because they're parameters, but
 384    for continuity).
 385
 386    Second, saved registers that go on the register-stack.
 387
 388    Third, special registers rH, rR and rJ.  They should not normally be
 389    allocated, but since they're call-clobbered, it is cheaper to use one
 390    of them than using a call-saved register for a call-clobbered use,
 391    assuming it is referenced a very limited number of times.  Other global
 392    and fixed registers come next; they are never allocated.  */
 393 #define MMIX_GNU_ABI_REG_ALLOC_ORDER            \
 394  { 252, 251, 250, 249, 248, 247, 246,           \
 395    245, 244, 243, 242, 241, 240, 239, 238,      \
 396    237, 236, 235, 234, 233, 232, 231,           \
 397                                                 \
 398    0, 1, 2, 3, 4, 5, 6, 7,                      \
 399    8, 9, 10, 11, 12, 13, 14, 15,                \
 400    16, 17, 18, 19, 20, 21, 22, 23,              \
 401    24, 25, 26, 27, 28, 29, 30, 31,              \
 402                                                 \
 403    253,                                         \
 404                                                 \
 405    258, 260, 259,                               \
 406                                                 \
 407    32, 33, 34, 35, 36, 37, 38, 39,              \
 408    40, 41, 42, 43, 44, 45, 46, 47,              \
 409    48, 49, 50, 51, 52, 53, 54, 55,              \
 410    56, 57, 58, 59, 60, 61, 62, 63,              \
 411    64, 65, 66, 67, 68, 69, 70, 71,              \
 412    72, 73, 74, 75, 76, 77, 78, 79,              \
 413    80, 81, 82, 83, 84, 85, 86, 87,              \
 414    88, 89, 90, 91, 92, 93, 94, 95,              \
 415    96, 97, 98, 99, 100, 101, 102, 103,          \
 416    104, 105, 106, 107, 108, 109, 110, 111,      \
 417    112, 113, 114, 115, 116, 117, 118, 119,      \
 418    120, 121, 122, 123, 124, 125, 126, 127,      \
 419    128, 129, 130, 131, 132, 133, 134, 135,      \
 420    136, 137, 138, 139, 140, 141, 142, 143,      \
 421    144, 145, 146, 147, 148, 149, 150, 151,      \
 422    152, 153, 154, 155, 156, 157, 158, 159,      \
 423    160, 161, 162, 163, 164, 165, 166, 167,      \
 424    168, 169, 170, 171, 172, 173, 174, 175,      \
 425    176, 177, 178, 179, 180, 181, 182, 183,      \
 426    184, 185, 186, 187, 188, 189, 190, 191,      \
 427    192, 193, 194, 195, 196, 197, 198, 199,      \
 428    200, 201, 202, 203, 204, 205, 206, 207,      \
 429    208, 209, 210, 211, 212, 213, 214, 215,      \
 430    216, 217, 218, 219, 220, 221, 222, 223,      \
 431    224, 225, 226, 227, 228, 229, 230,           \
 432                                                 \
 433    254, 255, 256, 257, 261, 262                 \
 434  }
 435
 436 /* The default one.  */
 437 #define REG_ALLOC_ORDER MMIX_MMIXWARE_ABI_REG_ALLOC_ORDER
 438
 439 /* Node: Values in Registers */
 440
 441 #define HARD_REGNO_NREGS(REGNO, MODE)                   \
 442    ((GET_MODE_SIZE (MODE) + UNITS_PER_WORD - 1)         \
 443     / UNITS_PER_WORD)
 444
 445 #define HARD_REGNO_MODE_OK(REGNO, MODE) 1
 446
 447 /* Note that no register can really be accessed in single-float mode, so
 448    we *can* say 1 here.  FIXME:  Will TRT happen for single-float, or do
 449    we have to punt to libgcc1.asm?  */
 450 #define MODES_TIEABLE_P(MODE1, MODE2) 1
 451
 452
 453 /* Node: Leaf Functions */
 454 /* (empty) */
 455
 456
 457 /* Node: Register Classes */
 458
 459 enum reg_class
 460  {
 461    NO_REGS, GENERAL_REGS, REMAINDER_REG, HIMULT_REG,
 462    SYSTEM_REGS, ALL_REGS, LIM_REG_CLASSES
 463  };
 464
 465 #define N_REG_CLASSES (int) LIM_REG_CLASSES
 466
 467 #define REG_CLASS_NAMES                                         \
 468  {"NO_REGS", "GENERAL_REGS", "REMAINDER_REG", "HIMULT_REG",     \
 469   "SYSTEM_REGS", "ALL_REGS"}
 470
 471 /* Note that the contents of each item is always 32 bits.  */
 472 #define REG_CLASS_CONTENTS                      \
 473  {{0, 0, 0, 0, 0, 0, 0, 0, 0},                  \
 474   {~0, ~0, ~0, ~0, ~0, ~0, ~0, ~0, 0x20},       \
 475   {0, 0, 0, 0, 0, 0, 0, 0, 0x10},               \
 476   {0, 0, 0, 0, 0, 0, 0, 0, 4},                  \
 477   {0, 0, 0, 0, 0, 0, 0, 0, 0x7f},               \
 478   {~0, ~0, ~0, ~0, ~0, ~0, ~0, ~0, 0x7f}}
 479
 480 #define REGNO_REG_CLASS(REGNO)                                  \
 481  ((REGNO) <= MMIX_LAST_GENERAL_REGISTER                         \
 482   || (REGNO) == MMIX_ARG_POINTER_REGNUM                         \
 483   ? GENERAL_REGS                                                \
 484   : (REGNO) == MMIX_REMAINDER_REGNUM ? REMAINDER_REG            \
 485   : (REGNO) == MMIX_HIMULT_REGNUM ? HIMULT_REG : SYSTEM_REGS)
 486
 487 #define BASE_REG_CLASS GENERAL_REGS
 488
 489 #define INDEX_REG_CLASS GENERAL_REGS
 490
 491 #define REG_CLASS_FROM_LETTER(CHAR)             \
 492  ((CHAR) == 'x' ? SYSTEM_REGS                   \
 493   : (CHAR) == 'y' ? REMAINDER_REG               \
 494   : (CHAR) == 'z' ? HIMULT_REG : NO_REGS)
 495
 496 #define REGNO_OK_FOR_BASE_P(REGNO)                              \
 497  ((REGNO) <= MMIX_LAST_GENERAL_REGISTER                         \
 498   || (REGNO) == MMIX_ARG_POINTER_REGNUM                         \
 499   || (reg_renumber[REGNO] > 0                                   \
 500       && reg_renumber[REGNO] <= MMIX_LAST_GENERAL_REGISTER))
 501
 502 #define REGNO_OK_FOR_INDEX_P(REGNO) REGNO_OK_FOR_BASE_P (REGNO)
 503
 504 #define PREFERRED_RELOAD_CLASS(X, CLASS) \
 505  mmix_preferred_reload_class (X, CLASS)
 506
 507 #define PREFERRED_OUTPUT_RELOAD_CLASS(X, CLASS) \
 508  mmix_preferred_output_reload_class (X, CLASS)
 509
 510 #define SECONDARY_INPUT_RELOAD_CLASS(CLASS, MODE, X) \
 511  mmix_secondary_reload_class (CLASS, MODE, X, 1)
 512
 513 #define SECONDARY_OUTPUT_RELOAD_CLASS(CLASS, MODE, X) \
 514  mmix_secondary_reload_class (CLASS, MODE, X, 0)
 515
 516 #define CLASS_MAX_NREGS(CLASS, MODE) HARD_REGNO_NREGS (CLASS, MODE)
 517
 518 #define CONST_OK_FOR_LETTER_P(VALUE, C) \
 519  mmix_const_ok_for_letter_p (VALUE, C)
 520
 521 #define EXTRA_CONSTRAINT(VALUE, C)      \
 522  mmix_extra_constraint (VALUE, C, MMIX_REG_OK_STRICT)
 523
 524 /* Do we need anything serious here?  Yes, any FLOT constant.  */
 525 #define CONST_DOUBLE_OK_FOR_LETTER_P(VALUE, C)                  \
 526  mmix_const_double_ok_for_letter_p (VALUE, C)
 527
 528
 529 /* Node: Frame Layout */
 530
 531 #define STACK_GROWS_DOWNWARD
 532 #define FRAME_GROWS_DOWNWARD 1
 533
 534 #define STARTING_FRAME_OFFSET \
 535   mmix_starting_frame_offset ()
 536
 537 #define FIRST_PARM_OFFSET(FUNDECL) 0
 538
 539 #define DYNAMIC_CHAIN_ADDRESS(FRAMEADDR) \
 540  mmix_dynamic_chain_address (FRAMEADDR)
 541
 542 /* FIXME: It seems RETURN_ADDR_OFFSET is undocumented.  */
 543
 544 #define SETUP_FRAME_ADDRESSES() \
 545  mmix_setup_frame_addresses ()
 546
 547 #define RETURN_ADDR_RTX(COUNT, FRAME)           \
 548  mmix_return_addr_rtx (COUNT, FRAME)
 549
 550 /* It's in rJ before we store it somewhere.  */
 551 #define INCOMING_RETURN_ADDR_RTX \
 552  gen_rtx_REG (Pmode, MMIX_INCOMING_RETURN_ADDRESS_REGNUM)
 553
 554 /* FIXME: This does not seem properly documented or cross-indexed.
 555    Nowhere except in the code does it say it *has* to be in the range
 556    0..255, or else it will be truncated.  That goes for the default too.  */
 557 #define DWARF_FRAME_RETURN_COLUMN \
 558  DWARF_FRAME_REGNUM (MMIX_INCOMING_RETURN_ADDRESS_REGNUM)
 559
 560 /* No return address is stored there.  */
 561 #define INCOMING_FRAME_SP_OFFSET 0
 562
 563 /* Node: Stack Checking */
 564 /* (empty) */
 565
 566
 567 /* Node: Exception Handling */
 568
 569 #define EH_RETURN_DATA_REGNO(N) \
 570  mmix_eh_return_data_regno (N)
 571
 572 #define EH_RETURN_STACKADJ_RTX \
 573  mmix_eh_return_stackadj_rtx ()
 574
 575 #define EH_RETURN_HANDLER_RTX \
 576  mmix_eh_return_handler_rtx ()
 577
 578 #define ASM_PREFERRED_EH_DATA_FORMAT(CODE, GLOBAL) \
 579  mmix_asm_preferred_eh_data_format (CODE, GLOBAL)
 580
 581 /* Node: Frame Registers */
 582 #define STACK_POINTER_REGNUM MMIX_STACK_POINTER_REGNUM
 583
 584 /* Perhaps we can use HARD_FRAME_POINTER_REGNUM and decide later on
 585    what register we want to use.  */
 586 #define FRAME_POINTER_REGNUM MMIX_FRAME_POINTER_REGNUM
 587 #define ARG_POINTER_REGNUM MMIX_ARG_POINTER_REGNUM
 588
 589 #define STATIC_CHAIN_REGNUM MMIX_STATIC_CHAIN_REGNUM
 590
 591
 592 /* Node: Elimination */
 593 /* FIXME: Is this requirement built-in?  Anyway, we should try to get rid
 594    of it; we can deduce the value.  */
 595 #define FRAME_POINTER_REQUIRED  cfun->has_nonlocal_label
 596
 597 /* The frame-pointer is stored in a location that either counts to the
 598    offset of incoming parameters, or that counts to the offset of the
 599    frame, so we can't use a single offset.  We therefore eliminate those
 600    two separately.  */
 601 #define ELIMINABLE_REGS                         \
 602  {{ARG_POINTER_REGNUM, STACK_POINTER_REGNUM},   \
 603   {ARG_POINTER_REGNUM, FRAME_POINTER_REGNUM},   \
 604   {FRAME_POINTER_REGNUM, STACK_POINTER_REGNUM}}
 605
 606 /* We need not worry about when the frame-pointer is required for other
 607    reasons; GCC takes care of those cases.  */
 608 #define CAN_ELIMINATE(FROM, TO) 1
 609
 610 #define INITIAL_ELIMINATION_OFFSET(FROM, TO, OFFSET) \
 611  (OFFSET) = mmix_initial_elimination_offset (FROM, TO)
 612
 613
 614 /* Node: Stack Arguments */
 615
 616 #define ACCUMULATE_OUTGOING_ARGS 1
 617
 618 #define RETURN_POPS_ARGS(FUNDECL, FUNTYPE, STACKSIZE) 0
 619
 620
 621 /* Node: Register Arguments */
 622 #define FUNCTION_ARG(CUM, MODE, TYPE, NAMED)    \
 623  mmix_function_arg (&(CUM), MODE, TYPE, NAMED, 0)
 624
 625 #define FUNCTION_INCOMING_ARG(CUM, MODE, TYPE, NAMED)   \
 626  mmix_function_arg (&(CUM), MODE, TYPE, NAMED, 1)
 627
 628 typedef struct { int regs; int lib; } CUMULATIVE_ARGS;
 629
 630 #define INIT_CUMULATIVE_ARGS(CUM, FNTYPE, LIBNAME, INDIRECT, N_NAMED_ARGS) \
 631  ((CUM).regs = 0, (CUM).lib = ((LIBNAME) != 0))
 632
 633 #define FUNCTION_ARG_ADVANCE(CUM, MODE, TYPE, NAMED)            \
 634  ((CUM).regs                                                    \
 635   = ((targetm.calls.must_pass_in_stack (MODE, TYPE))            \
 636      || (MMIX_FUNCTION_ARG_SIZE (MODE, TYPE) > 8                \
 637          && !TARGET_LIBFUNC && !(CUM).lib))                     \
 638   ? (MMIX_MAX_ARGS_IN_REGS) + 1                                 \
 639   : (CUM).regs + (7 + (MMIX_FUNCTION_ARG_SIZE (MODE, TYPE))) / 8)
 640
 641 #define FUNCTION_ARG_REGNO_P(REGNO)             \
 642  mmix_function_arg_regno_p (REGNO, 0)
 643
 644
 645 /* Node: Register Arguments */
 646
 647 #define FUNCTION_VALUE(VALTYPE, FUNC)  \
 648  gen_rtx_REG (TYPE_MODE (VALTYPE), MMIX_RETURN_VALUE_REGNUM)
 649
 650 /* This needs to take care of the register hole for complex return values.  */
 651 #define FUNCTION_OUTGOING_VALUE(VALTYPE, FUNC)  \
 652  mmix_function_outgoing_value (VALTYPE, FUNC)
 653
 654 #define LIBCALL_VALUE(MODE) \
 655  gen_rtx_REG (MODE, MMIX_RETURN_VALUE_REGNUM)
 656
 657 #define FUNCTION_VALUE_REGNO_P(REGNO) \
 658  mmix_function_value_regno_p (REGNO)
 659
 660
 661 /* Node: Caller Saves */
 662 /* (empty) */
 663
 664
 665 /* Node: Function Entry */
 666
 667 /* See mmix.c for TARGET_ASM_FUNCTION_PROLOGUE and
 668    TARGET_ASM_FUNCTION_EPILOGUE.  */
 669
 670 /* We need to say that the epilogue uses the return address, so the
 671    initial-value machinery restores it.  FIXME: Some targets
 672    conditionalize on "reload_completed &&".  Investigate difference.
 673    FIXME: Not needed if nonlocal_goto_stack_level.  */
 674 #define EPILOGUE_USES(REGNO) \
 675  ((REGNO) == MMIX_INCOMING_RETURN_ADDRESS_REGNUM)
 676
 677 /* Node: Profiling */
 678 #define FUNCTION_PROFILER(FILE, LABELNO)        \
 679  mmix_function_profiler (FILE, LABELNO)
 680
 681 /* Node: Trampolines */
 682
 683 #define TRAMPOLINE_TEMPLATE(FILE) \
 684  mmix_trampoline_template (FILE)
 685
 686 #define TRAMPOLINE_SIZE mmix_trampoline_size
 687 #define INITIALIZE_TRAMPOLINE(ADDR, FNADDR, STATIC_CHAIN) \
 688  mmix_initialize_trampoline (ADDR, FNADDR, STATIC_CHAIN)
 689
 690
 691 /* Node: Addressing Modes */
 692
 693 #define CONSTANT_ADDRESS_P(X) \
 694  mmix_constant_address_p (X)
 695
 696 #define MAX_REGS_PER_ADDRESS 2
 697
 698 #define GO_IF_LEGITIMATE_ADDRESS(MODE, X, LABEL)                \
 699  if (mmix_legitimate_address (MODE, X, MMIX_REG_OK_STRICT))     \
 700    goto LABEL
 701
 702 #ifndef REG_OK_STRICT
 703 # define REG_OK_FOR_BASE_P(X)                   \
 704   (REGNO (X) <= MMIX_LAST_GENERAL_REGISTER      \
 705    || REGNO (X) == MMIX_ARG_POINTER_REGNUM      \
 706    || REGNO (X) >= FIRST_PSEUDO_REGISTER)
 707 #else
 708 # define REG_OK_FOR_BASE_P(X) REGNO_OK_FOR_BASE_P (REGNO (X))
 709 #endif /* REG_OK_STRICT */
 710
 711 #define REG_OK_FOR_INDEX_P(X) REG_OK_FOR_BASE_P (X)
 712
 713 #define LEGITIMATE_CONSTANT_P(X) \
 714  mmix_legitimate_constant_p (X)
 715
 716
 717 /* Node: Condition Code */
 718
 719 #define SELECT_CC_MODE(OP, X, Y)                \
 720  mmix_select_cc_mode (OP, X, Y)
 721
 722 /* A definition of CANONICALIZE_COMPARISON that changed LE and GT
 723    comparisons with -1 to LT and GE respectively, and LT, LTU, GE or GEU
 724    comparisons with 256 to 255 and LE, LEU, GT and GTU has been
 725    ineffective; the code path for performing the changes did not trig for
 726    neither the GCC testsuite nor ghostscript-6.52 nor Knuth's mmix.tar.gz
 727    itself (core GCC functionality supposedly handling it) with sources
 728    from 2002-06-06.  */
 729
 730 #define REVERSIBLE_CC_MODE(MODE)                \
 731  mmix_reversible_cc_mode (MODE)
 732
 733
 734 /* Node: Costs */
 735
 736 /* The special registers can only move to and from general regs, and we
 737    need to check that their constraints match, so say 3 for them.  */
 738 /* WARNING: gcc-2.7.2.2 i686-pc-linux-gnulibc1 (as shipped with RH 4.2)
 739    miscompiles reload1.c:reload_cse_simplify_set; a call to
 740    reload_cse_regno_equal_p is missing when checking if a substitution of
 741    a register setting is valid if this is defined to just the expression
 742    in mmix_register_move_cost.
 743
 744    Symptom: a (all?) register setting is optimized away for e.g.
 745    "char *p1(char *p) { return p+1; }" and the value of register zero ($0)
 746    is returned.
 747
 748    We can workaround by making this a function call - unknown if this
 749    causes dire speed effects.  */
 750 #define REGISTER_MOVE_COST(MODE, FROM, TO) \
 751  mmix_register_move_cost (MODE, FROM, TO)
 752
 753 #define SLOW_BYTE_ACCESS 0
 754
 755
 756 /* Node: Sections */
 757
 758 /* This must be a constant string, since it's used in crtstuff.c.  */
 759 #define TEXT_SECTION_ASM_OP \
 760  "\t.text ! mmixal:= 9H LOC 8B"
 761
 762 /* FIXME: Not documented.  */
 763 #define DATA_SECTION_ASM_OP \
 764  mmix_data_section_asm_op ()
 765
 766 #define READONLY_DATA_SECTION_ASM_OP    "\t.section\t.rodata"
 767
 768 /* Node: PIC */
 769 /* (empty) */
 770
 771
 772 /* Node: File Framework */
 773
 774 /* While any other punctuation character but ";" would do, we prefer "%"
 775    or "!"; "!" is an unary operator and so will not be mistakenly included
 776    in correctly formed expressions.  The hash character adds mass; catches
 777    the eye.  We can't have it as a comment char by itself, since it's a
 778    hex-number prefix.  */
 779 #define ASM_COMMENT_START "!#"
 780
 781 /* These aren't currently functional.  We just keep them as markers.  */
 782 #define ASM_APP_ON "%APP\n"
 783 #define ASM_APP_OFF "%NO_APP\n"
 784
 785 #define ASM_OUTPUT_SOURCE_FILENAME(STREAM, NAME) \
 786  mmix_asm_output_source_filename (STREAM, NAME)
 787
 788 #define OUTPUT_QUOTED_STRING(STREAM, STRING) \
 789  mmix_output_quoted_string (STREAM, STRING, strlen (STRING))
 790
 791 #define TARGET_ASM_NAMED_SECTION default_elf_asm_named_section
 792
 793 /* Node: Data Output */
 794
 795 #define ASM_OUTPUT_ASCII(STREAM, PTR, LEN) \
 796  mmix_asm_output_ascii (STREAM, PTR, LEN)
 797
 798 /* Node: Uninitialized Data */
 799
 800 #define ASM_OUTPUT_ALIGNED_COMMON(ST, N, S, A) \
 801  mmix_asm_output_aligned_common (ST, N, S, A)
 802
 803 #define ASM_OUTPUT_ALIGNED_LOCAL(ST, N, S, A) \
 804  mmix_asm_output_aligned_local (ST, N, S, A)
 805
 806
 807 /* Node: Label Output */
 808
 809 #define ASM_OUTPUT_LABEL(STREAM, NAME) \
 810  mmix_asm_output_label (STREAM, NAME)
 811
 812 #define ASM_OUTPUT_INTERNAL_LABEL(STREAM, NAME) \
 813  mmix_asm_output_internal_label (STREAM, NAME)
 814
 815 #define ASM_DECLARE_REGISTER_GLOBAL(STREAM, DECL, REGNO, NAME) \
 816  mmix_asm_declare_register_global (STREAM, DECL, REGNO, NAME)
 817
 818 #define GLOBAL_ASM_OP "\t.global "
 819
 820 #define ASM_WEAKEN_LABEL(STREAM, NAME) \
 821  mmix_asm_weaken_label (STREAM, NAME)
 822
 823 #define MAKE_DECL_ONE_ONLY(DECL) \
 824  mmix_make_decl_one_only (DECL)
 825
 826 #define ASM_OUTPUT_LABELREF(STREAM, NAME) \
 827  mmix_asm_output_labelref (STREAM, NAME)
 828
 829 /* We insert a ":" to disambiguate against user symbols like L5.  */
 830 #define ASM_GENERATE_INTERNAL_LABEL(LABEL, PREFIX, NUM) \
 831  sprintf (LABEL, "*%s:%ld", PREFIX, (long)(NUM))
 832
 833 /* Insert "::"; these are rarer than internal labels.  FIXME: Make sure no
 834    ":" is seen in the object file; we don't really want that mmixal
 835    feature visible there.  We don't want the default, which uses a dot;
 836    that'd be incompatible with mmixal.  */
 837 #define ASM_PN_FORMAT "%s::%lu"
 838
 839 #define ASM_OUTPUT_DEF(STREAM, NAME, VALUE) \
 840  mmix_asm_output_def (STREAM, NAME, VALUE)
 841
 842 /* Node: Macros for Initialization */
 843 /* We're compiling to ELF and linking to MMO; fundamental ELF features
 844    that GCC depend on are there.  */
 845
 846 /* These must be constant strings, since they're used in crtstuff.c.  */
 847 #define INIT_SECTION_ASM_OP "\t.section .init,\"ax\" ! mmixal-incompatible"
 848
 849 #define FINI_SECTION_ASM_OP "\t.section .fini,\"ax\" ! mmixal-incompatible"
 850
 851 #define OBJECT_FORMAT_ELF
 852
 853
 854 /* Node: Instruction Output */
 855
 856 /* The non-$ register names must be prefixed with ":", since they're
 857    affected by PREFIX.  We provide the non-colon names as additional
 858    names.  */
 859 #define REGISTER_NAMES                                                  \
 860  {"$0", "$1", "$2", "$3", "$4", "$5", "$6", "$7",                       \
 861   "$8", "$9", "$10", "$11", "$12", "$13", "$14", "$15",                 \
 862   "$16", "$17", "$18", "$19", "$20", "$21", "$22", "$23",               \
 863   "$24", "$25", "$26", "$27", "$28", "$29", "$30", "$31",               \
 864   "$32", "$33", "$34", "$35", "$36", "$37", "$38", "$39",               \
 865   "$40", "$41", "$42", "$43", "$44", "$45", "$46", "$47",               \
 866   "$48", "$49", "$50", "$51", "$52", "$53", "$54", "$55",               \
 867   "$56", "$57", "$58", "$59", "$60", "$61", "$62", "$63",               \
 868   "$64", "$65", "$66", "$67", "$68", "$69", "$70", "$71",               \
 869   "$72", "$73", "$74", "$75", "$76", "$77", "$78", "$79",               \
 870   "$80", "$81", "$82", "$83", "$84", "$85", "$86", "$87",               \
 871   "$88", "$89", "$90", "$91", "$92", "$93", "$94", "$95",               \
 872   "$96", "$97", "$98", "$99", "$100", "$101", "$102", "$103",           \
 873   "$104", "$105", "$106", "$107", "$108", "$109", "$110", "$111",       \
 874   "$112", "$113", "$114", "$115", "$116", "$117", "$118", "$119",       \
 875   "$120", "$121", "$122", "$123", "$124", "$125", "$126", "$127",       \
 876   "$128", "$129", "$130", "$131", "$132", "$133", "$134", "$135",       \
 877   "$136", "$137", "$138", "$139", "$140", "$141", "$142", "$143",       \
 878   "$144", "$145", "$146", "$147", "$148", "$149", "$150", "$151",       \
 879   "$152", "$153", "$154", "$155", "$156", "$157", "$158", "$159",       \
 880   "$160", "$161", "$162", "$163", "$164", "$165", "$166", "$167",       \
 881   "$168", "$169", "$170", "$171", "$172", "$173", "$174", "$175",       \
 882   "$176", "$177", "$178", "$179", "$180", "$181", "$182", "$183",       \
 883   "$184", "$185", "$186", "$187", "$188", "$189", "$190", "$191",       \
 884   "$192", "$193", "$194", "$195", "$196", "$197", "$198", "$199",       \
 885   "$200", "$201", "$202", "$203", "$204", "$205", "$206", "$207",       \
 886   "$208", "$209", "$210", "$211", "$212", "$213", "$214", "$215",       \
 887   "$216", "$217", "$218", "$219", "$220", "$221", "$222", "$223",       \
 888   "$224", "$225", "$226", "$227", "$228", "$229", "$230", "$231",       \
 889   "$232", "$233", "$234", "$235", "$236", "$237", "$238", "$239",       \
 890   "$240", "$241", "$242", "$243", "$244", "$245", "$246", "$247",       \
 891   "$248", "$249", "$250", "$251", "$252", "$253", "$254", "$255",       \
 892   ":rD",  ":rE",  ":rH",  ":rJ",  ":rR",  "ap_!BAD!", ":rO"}
 893
 894 #define ADDITIONAL_REGISTER_NAMES                       \
 895  {{"sp", 254}, {":sp", 254}, {"rD", 256}, {"rE", 257},  \
 896   {"rH", 258}, {"rJ", MMIX_rJ_REGNUM}, {"rO", MMIX_rO_REGNUM}}
 897
 898 #define PRINT_OPERAND(STREAM, X, CODE) \
 899  mmix_print_operand (STREAM, X, CODE)
 900
 901 #define PRINT_OPERAND_PUNCT_VALID_P(CODE) \
 902  mmix_print_operand_punct_valid_p (CODE)
 903
 904 #define PRINT_OPERAND_ADDRESS(STREAM, X) \
 905  mmix_print_operand_address (STREAM, X)
 906
 907 #define ASM_OUTPUT_REG_PUSH(STREAM, REGNO) \
 908  mmix_asm_output_reg_push (STREAM, REGNO)
 909
 910 #define ASM_OUTPUT_REG_POP(STREAM, REGNO) \
 911  mmix_asm_output_reg_pop (STREAM, REGNO)
 912
 913
 914 /* Node: Dispatch Tables */
 915
 916 /* We define both types, since SImode is the better, but DImode the only
 917    possible for mmixal so that's the one actually used.  */
 918 #define ASM_OUTPUT_ADDR_DIFF_ELT(STREAM, BODY, VALUE, REL) \
 919  mmix_asm_output_addr_diff_elt (STREAM, BODY, VALUE, REL)
 920
 921 #define ASM_OUTPUT_ADDR_VEC_ELT(STREAM, VALUE) \
 922  mmix_asm_output_addr_vec_elt (STREAM, VALUE)
 923
 924
 925 /* Node: Exception Region Output */
 926 /* (empty) */
 927
 928 /* Node: Alignment Output */
 929
 930 #define ASM_OUTPUT_SKIP(STREAM, NBYTES) \
 931  mmix_asm_output_skip (STREAM, NBYTES)
 932
 933 #define ASM_OUTPUT_ALIGN(STREAM, POWER) \
 934  mmix_asm_output_align (STREAM, POWER)
 935
 936
 937 /* Node: All Debuggers */
 938
 939 #define DBX_REGISTER_NUMBER(REGNO) \
 940  mmix_dbx_register_number (REGNO)
 941
 942
 943 /* Node: DBX Options */
 944 /* (empty) */
 945 /* Node: DBX Hooks */
 946 /* (empty) */
 947 /* Node: File Names and DBX */
 948 /* (empty) */
 949
 950
 951 /* Node: SDB and DWARF */
 952 #define DWARF2_DEBUGGING_INFO 1
 953 #define DWARF2_ASM_LINE_DEBUG_INFO 1
 954
 955 /* Node: Misc */
 956
 957 /* There's no way to get a PC-relative offset into tables for SImode, so
 958    for the moment we have absolute entries in DImode.
 959    When we're going ELF, these should be SImode and 1.  */
 960 #define CASE_VECTOR_MODE DImode
 961 #define CASE_VECTOR_PC_RELATIVE 0
 962
 963 #define WORD_REGISTER_OPERATIONS
 964
 965 /* We have a choice, which makes this yet another parameter to tweak.  The
 966    gut feeling is currently that SIGN_EXTEND wins; "int" is more frequent
 967    than "unsigned int", and we have signed characters.  FIXME: measure.  */
 968 #define LOAD_EXTEND_OP(MODE) (TARGET_ZERO_EXTEND ? ZERO_EXTEND : SIGN_EXTEND)
 969
 970 #define MOVE_MAX 8
 971
 972 #define TRULY_NOOP_TRUNCATION(OUTPREC, INPREC) 1
 973
 974 /* ??? MMIX allows a choice of STORE_FLAG_VALUE.  Revisit later,
 975    we don't have scc expanders yet.  */
 976
 977 #define Pmode DImode
 978
 979 #define FUNCTION_MODE QImode
 980
 981 #define NO_IMPLICIT_EXTERN_C
 982
 983 #define HANDLE_SYSV_PRAGMA 1
 984
 985 /* These are checked.  */
 986 #define DOLLARS_IN_IDENTIFIERS 0
 987 #define NO_DOLLAR_IN_LABEL
 988 #define NO_DOT_IN_LABEL
 989
 990 #endif /* GCC_MMIX_H */
 991 /*
 992  * Local variables:
 993  * eval: (c-set-style "gnu")
 994  * indent-tabs-mode: t
 995  * End:
 996  */