gcc/config/mmix/mmix.h

   1 /* Definitions of target machine for GNU compiler, for MMIX.
   2    Copyright (C) 2000, 2001, 2002, 2004, 2005, 2007 Free Software Foundation, Inc.
   3    Contributed by Hans-Peter Nilsson (hp@bitrange.com)
   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 #ifndef GCC_MMIX_H
  22 #define GCC_MMIX_H
  23
  24 /* First, some local helper macros.  Note that the "default" value of
  25    FIXED_REGISTERS, CALL_USED_REGISTERS, REG_ALLOC_ORDER and
  26    REG_CLASS_CONTENTS depend on these values.  */
  27 #define MMIX_RESERVED_GNU_ARG_0_REGNUM 231
  28 #define MMIX_FIRST_ARG_REGNUM \
  29   (TARGET_ABI_GNU ? MMIX_RESERVED_GNU_ARG_0_REGNUM : 16)
  30 #define MMIX_FIRST_INCOMING_ARG_REGNUM \
  31   (TARGET_ABI_GNU ? MMIX_RESERVED_GNU_ARG_0_REGNUM : 0)
  32 #define MMIX_MAX_ARGS_IN_REGS 16
  33
  34 /* FIXME: This one isn't fully implemented yet.  Return values larger than
  35    one register are passed by reference in MMIX_STRUCT_VALUE_REGNUM by the
  36    caller, except for return values of type "complex".  */
  37 #define MMIX_MAX_REGS_FOR_VALUE 16
  38 #define MMIX_RETURN_VALUE_REGNUM \
  39   (TARGET_ABI_GNU ? MMIX_RESERVED_GNU_ARG_0_REGNUM : 15)
  40 #define MMIX_OUTGOING_RETURN_VALUE_REGNUM \
  41   (TARGET_ABI_GNU ? MMIX_RESERVED_GNU_ARG_0_REGNUM : 0)
  42 #define MMIX_STRUCT_VALUE_REGNUM 251
  43 #define MMIX_STATIC_CHAIN_REGNUM 252
  44 #define MMIX_FRAME_POINTER_REGNUM 253
  45 #define MMIX_STACK_POINTER_REGNUM 254
  46 #define MMIX_LAST_GENERAL_REGISTER 255
  47 #define MMIX_INCOMING_RETURN_ADDRESS_REGNUM MMIX_rJ_REGNUM
  48 #define MMIX_HIMULT_REGNUM 258
  49 #define MMIX_REMAINDER_REGNUM MMIX_rR_REGNUM
  50 #define MMIX_ARG_POINTER_REGNUM 261
  51 #define MMIX_rO_REGNUM 262
  52 #define MMIX_LAST_STACK_REGISTER_REGNUM 31
  53
  54 /* Four registers; "ideally, these registers should be call-clobbered", so
  55    just grab a bunch of the common clobbered registers.  FIXME: Last
  56    registers of return-value should be used, with an error if there's a
  57    return-value (that collides in size).  */
  58 #define MMIX_EH_RETURN_DATA_REGNO_START (MMIX_STRUCT_VALUE_REGNUM - 4)
  59
  60 /* Try to keep the definitions from running away on their own.  */
  61 #if (MMIX_EH_RETURN_DATA_REGNO_START \
  62      != MMIX_RESERVED_GNU_ARG_0_REGNUM + MMIX_MAX_ARGS_IN_REGS)
  63  #error MMIX register definition inconsistency
  64 #endif
  65
  66 #if (MMIX_MAX_REGS_FOR_VALUE + MMIX_MAX_ARGS_IN_REGS > 32)
  67  #error MMIX parameters and return values bad, more than 32 registers
  68 #endif
  69
  70 /* This chosen as "a call-clobbered hard register that is otherwise
  71    untouched by the epilogue".  */
  72 #define MMIX_EH_RETURN_STACKADJ_REGNUM MMIX_STATIC_CHAIN_REGNUM
  73
  74 #ifdef REG_OK_STRICT
  75 # define MMIX_REG_OK_STRICT 1
  76 #else
  77 # define MMIX_REG_OK_STRICT 0
  78 #endif
  79
  80 #define MMIX_FUNCTION_ARG_SIZE(MODE, TYPE) \
  81  ((MODE) != BLKmode ? GET_MODE_SIZE (MODE) : int_size_in_bytes (TYPE))
  82
  83 /* Declarations for helper variables that are not tied to a particular
  84    target macro.  */
  85 extern GTY(()) rtx mmix_compare_op0;
  86 extern GTY(()) rtx mmix_compare_op1;
  87
  88 /* Per-function machine data.  This is normally an opaque type just
  89    defined and used in the tm.c file, but we need to see the definition in
  90    mmix.md too.  */
  91 struct machine_function GTY(())
  92  {
  93    int has_landing_pad;
  94    int highest_saved_stack_register;
  95    int in_prologue;
  96  };
  97
  98 /* For these target macros, there is no generic documentation here.  You
  99    should read `Using and Porting GCC' for that.  Only comments specific
 100    to the MMIX target are here.
 101
 102    There are however references to the specific texinfo node (comments
 103    with "Node:"), so there should be little or nothing amiss.  Probably
 104    the opposite, since we don't have to care about old littering and
 105    soon outdated generic comments.  */
 106
 107 /* Node: Driver */
 108
 109 /* User symbols are in the same name-space as built-in symbols, but we
 110    don't need the built-in symbols, so remove those and instead apply
 111    stricter operand checking.  Don't warn when expanding insns.  */
 112 #define ASM_SPEC "-no-predefined-syms -x"
 113
 114 /* Pass on -mset-program-start=N and -mset-data-start=M to the linker.
 115    Provide default program start 0x100 unless -mno-set-program-start.
 116    Don't do this if linking relocatably, with -r.  For a final link,
 117    produce mmo, unless ELF is requested or when linking relocatably.  */
 118 #define LINK_SPEC \
 119  "%{mset-program-start=*:--defsym __.MMIX.start..text=%*}\
 120   %{mset-data-start=*:--defsym __.MMIX.start..data=%*}\
 121   %{!mset-program-start=*:\
 122     %{!mno-set-program-start:\
 123      %{!r:--defsym __.MMIX.start..text=0x100}}}\
 124   %{!melf:%{!r:-m mmo}}%{melf|r:-m elf64mmix}"
 125
 126 /* FIXME: There's no provision for profiling here.  */
 127 #define STARTFILE_SPEC  \
 128   "crti%O%s crtbegin%O%s"
 129
 130 #define ENDFILE_SPEC "crtend%O%s crtn%O%s"
 131
 132 /* Node: Run-time Target */
 133
 134 /* Define __LONG_MAX__, since we're advised not to change glimits.h.  */
 135 #define TARGET_CPU_CPP_BUILTINS()                               \
 136   do                                                            \
 137     {                                                           \
 138       builtin_define ("__mmix__");                              \
 139       builtin_define ("__MMIX__");                              \
 140       if (TARGET_ABI_GNU)                                       \
 141         builtin_define ("__MMIX_ABI_GNU__");                    \
 142       else                                                      \
 143         builtin_define ("__MMIX_ABI_MMIXWARE__");               \
 144     }                                                           \
 145   while (0)
 146
 147 extern int target_flags;
 148
 149 #define TARGET_DEFAULT \
 150  (MASK_BRANCH_PREDICT | MASK_BASE_ADDRESSES | MASK_USE_RETURN_INSN)
 151
 152 /* Unfortunately, this must not reference anything in "mmix.c".  */
 153 #define TARGET_VERSION \
 154   fprintf (stderr, " (MMIX)")
 155
 156 #define OVERRIDE_OPTIONS mmix_override_options ()
 157
 158 #define OPTIMIZATION_OPTIONS(LEVEL, SIZE)       \
 159   do                                            \
 160     {                                           \
 161       if (LEVEL >= 1)                           \
 162         flag_regmove = TRUE;                    \
 163                                                 \
 164       if (SIZE || LEVEL > 1)                    \
 165         {                                       \
 166           flag_omit_frame_pointer = TRUE;       \
 167         }                                       \
 168     }                                           \
 169   while (0)
 170
 171 /* This one will have to wait a little bit; right now we can't debug
 172    neither with or without a frame-pointer.  */
 173 /* #define CAN_DEBUG_WITHOUT_FP */
 174
 175
 176 /* Node: Per-Function Data */
 177 #define INIT_EXPANDERS mmix_init_expanders ()
 178
 179
 180 /* Node: Storage Layout */
 181 /* I see no bit-field instructions.  Anyway, the common order is from low
 182    to high, as the power of two, hence little-endian.  */
 183 #define BITS_BIG_ENDIAN 0
 184 #define BYTES_BIG_ENDIAN 1
 185 #define WORDS_BIG_ENDIAN 1
 186 #define FLOAT_WORDS_BIG_ENDIAN 1
 187 #define UNITS_PER_WORD 8
 188
 189 /* FIXME: Promotion of modes currently generates slow code, extending
 190    before every operation.  */
 191 /* I'm a little bit undecided about this one.  It might be beneficial to
 192    promote all operations.  */
 193
 194 #define PROMOTE_FUNCTION_MODE(MODE, UNSIGNEDP, TYPE)    \
 195  do {                                           \
 196   if (GET_MODE_CLASS (MODE) == MODE_INT         \
 197       && GET_MODE_SIZE (MODE) < 8)              \
 198    {                                            \
 199      (MODE) = DImode;                           \
 200      /* Do the following some time later,       \
 201         scrutinizing differences.  */           \
 202      if (0) (UNSIGNEDP) = 0;                    \
 203    }                                            \
 204  } while (0)
 205
 206 /* We need to align everything to 64 bits that can affect the alignment
 207    of other types.  Since address N is interpreted in MMIX as (N modulo
 208    access_size), we must align.  */
 209 #define PARM_BOUNDARY 64
 210 #define STACK_BOUNDARY 64
 211 #define FUNCTION_BOUNDARY 32
 212 #define BIGGEST_ALIGNMENT 64
 213
 214 /* This one is only used in the ADA front end.  */
 215 #define MINIMUM_ATOMIC_ALIGNMENT 8
 216
 217 /* Copied from elfos.h.  */
 218 #define MAX_OFILE_ALIGNMENT (32768 * 8)
 219
 220 #define DATA_ALIGNMENT(TYPE, BASIC_ALIGN) \
 221  mmix_data_alignment (TYPE, BASIC_ALIGN)
 222
 223 #define CONSTANT_ALIGNMENT(CONSTANT, BASIC_ALIGN) \
 224  mmix_constant_alignment (CONSTANT, BASIC_ALIGN)
 225
 226 #define LOCAL_ALIGNMENT(TYPE, BASIC_ALIGN) \
 227  mmix_local_alignment (TYPE, BASIC_ALIGN)
 228
 229 /* Following other ports, this seems to most commonly be the word-size,
 230    so let's do that here too.  */
 231 #define EMPTY_FIELD_BOUNDARY 64
 232
 233 /* We chose to have this low solely for similarity with the alpha.  It has
 234    nothing to do with passing the tests dg/c99-scope-2 and
 235    execute/align-1.c.  Nothing.  Though the tests seem wrong.  Padding of
 236    the structure is automatically added to get alignment when needed if we
 237    set this to just byte-boundary.  */
 238 #define STRUCTURE_SIZE_BOUNDARY 8
 239
 240 /* The lower bits are ignored.  */
 241 #define STRICT_ALIGNMENT 1
 242
 243
 244 /* Node: Type Layout */
 245
 246 /* It might seem more natural to have 64-bit ints on a 64-bit machine,
 247    but then an occasional MMIX programmer needs to know how to put a lot
 248    of __attribute__ stuff to get to the 8, 16 and 32-bit modes rather
 249    than the "intuitive" char, short and int types.  */
 250 #define INT_TYPE_SIZE 32
 251 #define SHORT_TYPE_SIZE 16
 252 #define LONG_LONG_TYPE_SIZE 64
 253
 254 #define FLOAT_TYPE_SIZE 32
 255 #define DOUBLE_TYPE_SIZE 64
 256 #define LONG_DOUBLE_TYPE_SIZE 64
 257
 258 #define DEFAULT_SIGNED_CHAR 1
 259
 260
 261 /* Node: Register Basics */
 262 /* We tell GCC about all 256 general registers, and we also include
 263    rD, rE, rH, rJ, rR and rO (in that order) so we can describe what insns
 264    clobber them.  We use a faked register for the argument pointer.  It is
 265    always eliminated towards the frame-pointer or the stack-pointer, never
 266    output in assembly.  Any fixed register would do for this, like $255,
 267    but future debugging is easier when using a separate register.  It
 268    counts as a global register for pseudorandom reasons.  */
 269 #define FIRST_PSEUDO_REGISTER 263
 270
 271 /* We treat general registers with no assigned purpose as fixed.  The
 272    stack pointer, $254, is also fixed.  Register $255 is referred to as a
 273    temporary register in the MMIX papers, and used as such in mmixal, so
 274    it should not be used as a stack pointer.  We set it to fixed, and use
 275    it "manually" at times of despair.  */
 276 #define FIXED_REGISTERS \
 277  { 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, \
 278    0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, \
 279    1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, \
 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, 0, 0, 0, 0, 0, 0, 0, 1, 1, \
 293    1, 1, 0, 0, 0, 1, 1 \
 294  }
 295
 296 /* General registers are fixed and therefore "historically" marked
 297    call-used.  (FIXME: This has changed).  Registers $15..$31 are
 298    call-clobbered; we'll put arguments in $16 and up, and we need $15 for
 299    the MMIX register-stack "hole".  */
 300 #define CALL_USED_REGISTERS \
 301  { 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 1, \
 302    1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 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, 0, 1, 1, \
 317    1, 1, 1, 1, 1, 1, 1 \
 318  }
 319
 320 #define CONDITIONAL_REGISTER_USAGE mmix_conditional_register_usage ()
 321
 322 #define INCOMING_REGNO(OUT) mmix_opposite_regno (OUT, 0)
 323
 324 #define OUTGOING_REGNO(IN) mmix_opposite_regno (IN, 1)
 325
 326 /* Defining LOCAL_REGNO is necessary in presence of prologue/epilogue,
 327    else GCC will be confused that those registers aren't saved and
 328    restored.  */
 329 #define LOCAL_REGNO(REGNO) mmix_local_regno (REGNO)
 330
 331 /* Node: Allocation Order */
 332
 333 /* We should allocate registers from 0 to 31 by increasing number, because
 334    I think that's what people expect.  Beyond that, just use
 335    call-clobbered global registers first, then call-clobbered special
 336    registers.  Last, the fixed registers.  */
 337 #define MMIX_MMIXWARE_ABI_REG_ALLOC_ORDER       \
 338  { 0, 1, 2, 3, 4, 5, 6, 7,                      \
 339    8, 9, 10, 11, 12, 13, 14, 15,                \
 340    16, 17, 18, 19, 20, 21, 22, 23,              \
 341    24, 25, 26, 27, 28, 29, 30, 31,              \
 342                                                 \
 343    252, 251, 250, 249, 248, 247,                \
 344                                                 \
 345    253,                                         \
 346                                                 \
 347    258, 260, 259,                               \
 348                                                 \
 349    32, 33, 34, 35, 36, 37, 38, 39,              \
 350    40, 41, 42, 43, 44, 45, 46, 47,              \
 351    48, 49, 50, 51, 52, 53, 54, 55,              \
 352    56, 57, 58, 59, 60, 61, 62, 63,              \
 353    64, 65, 66, 67, 68, 69, 70, 71,              \
 354    72, 73, 74, 75, 76, 77, 78, 79,              \
 355    80, 81, 82, 83, 84, 85, 86, 87,              \
 356    88, 89, 90, 91, 92, 93, 94, 95,              \
 357    96, 97, 98, 99, 100, 101, 102, 103,          \
 358    104, 105, 106, 107, 108, 109, 110, 111,      \
 359    112, 113, 114, 115, 116, 117, 118, 119,      \
 360    120, 121, 122, 123, 124, 125, 126, 127,      \
 361    128, 129, 130, 131, 132, 133, 134, 135,      \
 362    136, 137, 138, 139, 140, 141, 142, 143,      \
 363    144, 145, 146, 147, 148, 149, 150, 151,      \
 364    152, 153, 154, 155, 156, 157, 158, 159,      \
 365    160, 161, 162, 163, 164, 165, 166, 167,      \
 366    168, 169, 170, 171, 172, 173, 174, 175,      \
 367    176, 177, 178, 179, 180, 181, 182, 183,      \
 368    184, 185, 186, 187, 188, 189, 190, 191,      \
 369    192, 193, 194, 195, 196, 197, 198, 199,      \
 370    200, 201, 202, 203, 204, 205, 206, 207,      \
 371    208, 209, 210, 211, 212, 213, 214, 215,      \
 372    216, 217, 218, 219, 220, 221, 222, 223,      \
 373    224, 225, 226, 227, 228, 229, 230, 231,      \
 374    232, 233, 234, 235, 236, 237, 238, 239,      \
 375    240, 241, 242, 243, 244, 245, 246,           \
 376                                                 \
 377    254, 255, 256, 257, 261, 262                 \
 378  }
 379
 380 /* As a convenience, we put this nearby, for ease of comparison.
 381    First, call-clobbered registers in reverse order of assignment as
 382    parameters (also the top ones; not because they're parameters, but
 383    for continuity).
 384
 385    Second, saved registers that go on the register-stack.
 386
 387    Third, special registers rH, rR and rJ.  They should not normally be
 388    allocated, but since they're call-clobbered, it is cheaper to use one
 389    of them than using a call-saved register for a call-clobbered use,
 390    assuming it is referenced a very limited number of times.  Other global
 391    and fixed registers come next; they are never allocated.  */
 392 #define MMIX_GNU_ABI_REG_ALLOC_ORDER            \
 393  { 252, 251, 250, 249, 248, 247, 246,           \
 394    245, 244, 243, 242, 241, 240, 239, 238,      \
 395    237, 236, 235, 234, 233, 232, 231,           \
 396                                                 \
 397    0, 1, 2, 3, 4, 5, 6, 7,                      \
 398    8, 9, 10, 11, 12, 13, 14, 15,                \
 399    16, 17, 18, 19, 20, 21, 22, 23,              \
 400    24, 25, 26, 27, 28, 29, 30, 31,              \
 401                                                 \
 402    253,                                         \
 403                                                 \
 404    258, 260, 259,                               \
 405                                                 \
 406    32, 33, 34, 35, 36, 37, 38, 39,              \
 407    40, 41, 42, 43, 44, 45, 46, 47,              \
 408    48, 49, 50, 51, 52, 53, 54, 55,              \
 409    56, 57, 58, 59, 60, 61, 62, 63,              \
 410    64, 65, 66, 67, 68, 69, 70, 71,              \
 411    72, 73, 74, 75, 76, 77, 78, 79,              \
 412    80, 81, 82, 83, 84, 85, 86, 87,              \
 413    88, 89, 90, 91, 92, 93, 94, 95,              \
 414    96, 97, 98, 99, 100, 101, 102, 103,          \
 415    104, 105, 106, 107, 108, 109, 110, 111,      \
 416    112, 113, 114, 115, 116, 117, 118, 119,      \
 417    120, 121, 122, 123, 124, 125, 126, 127,      \
 418    128, 129, 130, 131, 132, 133, 134, 135,      \
 419    136, 137, 138, 139, 140, 141, 142, 143,      \
 420    144, 145, 146, 147, 148, 149, 150, 151,      \
 421    152, 153, 154, 155, 156, 157, 158, 159,      \
 422    160, 161, 162, 163, 164, 165, 166, 167,      \
 423    168, 169, 170, 171, 172, 173, 174, 175,      \
 424    176, 177, 178, 179, 180, 181, 182, 183,      \
 425    184, 185, 186, 187, 188, 189, 190, 191,      \
 426    192, 193, 194, 195, 196, 197, 198, 199,      \
 427    200, 201, 202, 203, 204, 205, 206, 207,      \
 428    208, 209, 210, 211, 212, 213, 214, 215,      \
 429    216, 217, 218, 219, 220, 221, 222, 223,      \
 430    224, 225, 226, 227, 228, 229, 230,           \
 431                                                 \
 432    254, 255, 256, 257, 261, 262                 \
 433  }
 434
 435 /* The default one.  */
 436 #define REG_ALLOC_ORDER MMIX_MMIXWARE_ABI_REG_ALLOC_ORDER
 437
 438 /* Node: Values in Registers */
 439
 440 #define HARD_REGNO_NREGS(REGNO, MODE)                   \
 441    ((GET_MODE_SIZE (MODE) + UNITS_PER_WORD - 1)         \
 442     / UNITS_PER_WORD)
 443
 444 #define HARD_REGNO_MODE_OK(REGNO, MODE) 1
 445
 446 /* Note that no register can really be accessed in single-float mode, so
 447    we *can* say 1 here.  FIXME:  Will TRT happen for single-float, or do
 448    we have to punt to libgcc1.asm?  */
 449 #define MODES_TIEABLE_P(MODE1, MODE2) 1
 450
 451
 452 /* Node: Leaf Functions */
 453 /* (empty) */
 454
 455
 456 /* Node: Register Classes */
 457
 458 enum reg_class
 459  {
 460    NO_REGS, GENERAL_REGS, REMAINDER_REG, HIMULT_REG,
 461    SYSTEM_REGS, ALL_REGS, LIM_REG_CLASSES
 462  };
 463
 464 #define N_REG_CLASSES (int) LIM_REG_CLASSES
 465
 466 #define REG_CLASS_NAMES                                         \
 467  {"NO_REGS", "GENERAL_REGS", "REMAINDER_REG", "HIMULT_REG",     \
 468   "SYSTEM_REGS", "ALL_REGS"}
 469
 470 /* Note that the contents of each item is always 32 bits.  */
 471 #define REG_CLASS_CONTENTS                      \
 472  {{0, 0, 0, 0, 0, 0, 0, 0, 0},                  \
 473   {~0, ~0, ~0, ~0, ~0, ~0, ~0, ~0, 0x20},       \
 474   {0, 0, 0, 0, 0, 0, 0, 0, 0x10},               \
 475   {0, 0, 0, 0, 0, 0, 0, 0, 4},                  \
 476   {0, 0, 0, 0, 0, 0, 0, 0, 0x7f},               \
 477   {~0, ~0, ~0, ~0, ~0, ~0, ~0, ~0, 0x7f}}
 478
 479 #define REGNO_REG_CLASS(REGNO)                                  \
 480  ((REGNO) <= MMIX_LAST_GENERAL_REGISTER                         \
 481   || (REGNO) == MMIX_ARG_POINTER_REGNUM                         \
 482   ? GENERAL_REGS                                                \
 483   : (REGNO) == MMIX_REMAINDER_REGNUM ? REMAINDER_REG            \
 484   : (REGNO) == MMIX_HIMULT_REGNUM ? HIMULT_REG : SYSTEM_REGS)
 485
 486 #define BASE_REG_CLASS GENERAL_REGS
 487
 488 #define INDEX_REG_CLASS GENERAL_REGS
 489
 490 #define REG_CLASS_FROM_LETTER(CHAR)             \
 491  ((CHAR) == 'x' ? SYSTEM_REGS                   \
 492   : (CHAR) == 'y' ? REMAINDER_REG               \
 493   : (CHAR) == 'z' ? HIMULT_REG : NO_REGS)
 494
 495 #define REGNO_OK_FOR_BASE_P(REGNO)                              \
 496  ((REGNO) <= MMIX_LAST_GENERAL_REGISTER                         \
 497   || (REGNO) == MMIX_ARG_POINTER_REGNUM                         \
 498   || (reg_renumber[REGNO] > 0                                   \
 499       && reg_renumber[REGNO] <= MMIX_LAST_GENERAL_REGISTER))
 500
 501 #define REGNO_OK_FOR_INDEX_P(REGNO) REGNO_OK_FOR_BASE_P (REGNO)
 502
 503 #define PREFERRED_RELOAD_CLASS(X, CLASS) \
 504  mmix_preferred_reload_class (X, CLASS)
 505
 506 #define PREFERRED_OUTPUT_RELOAD_CLASS(X, CLASS) \
 507  mmix_preferred_output_reload_class (X, CLASS)
 508
 509 #define SECONDARY_INPUT_RELOAD_CLASS(CLASS, MODE, X) \
 510  mmix_secondary_reload_class (CLASS, MODE, X, 1)
 511
 512 #define SECONDARY_OUTPUT_RELOAD_CLASS(CLASS, MODE, X) \
 513  mmix_secondary_reload_class (CLASS, MODE, X, 0)
 514
 515 #define CLASS_MAX_NREGS(CLASS, MODE) HARD_REGNO_NREGS (CLASS, MODE)
 516
 517 #define CONST_OK_FOR_LETTER_P(VALUE, C) \
 518  mmix_const_ok_for_letter_p (VALUE, C)
 519
 520 #define EXTRA_CONSTRAINT(VALUE, C)      \
 521  mmix_extra_constraint (VALUE, C, MMIX_REG_OK_STRICT)
 522
 523 /* Do we need anything serious here?  Yes, any FLOT constant.  */
 524 #define CONST_DOUBLE_OK_FOR_LETTER_P(VALUE, C)                  \
 525  mmix_const_double_ok_for_letter_p (VALUE, C)
 526
 527
 528 /* Node: Frame Layout */
 529
 530 #define STACK_GROWS_DOWNWARD
 531 #define FRAME_GROWS_DOWNWARD 1
 532
 533 #define STARTING_FRAME_OFFSET \
 534   mmix_starting_frame_offset ()
 535
 536 #define FIRST_PARM_OFFSET(FUNDECL) 0
 537
 538 #define DYNAMIC_CHAIN_ADDRESS(FRAMEADDR) \
 539  mmix_dynamic_chain_address (FRAMEADDR)
 540
 541 /* FIXME: It seems RETURN_ADDR_OFFSET is undocumented.  */
 542
 543 #define SETUP_FRAME_ADDRESSES() \
 544  mmix_setup_frame_addresses ()
 545
 546 #define RETURN_ADDR_RTX(COUNT, FRAME)           \
 547  mmix_return_addr_rtx (COUNT, FRAME)
 548
 549 /* It's in rJ before we store it somewhere.  */
 550 #define INCOMING_RETURN_ADDR_RTX \
 551  gen_rtx_REG (Pmode, MMIX_INCOMING_RETURN_ADDRESS_REGNUM)
 552
 553 /* FIXME: This does not seem properly documented or cross-indexed.
 554    Nowhere except in the code does it say it *has* to be in the range
 555    0..255, or else it will be truncated.  That goes for the default too.  */
 556 #define DWARF_FRAME_RETURN_COLUMN \
 557  DWARF_FRAME_REGNUM (MMIX_INCOMING_RETURN_ADDRESS_REGNUM)
 558
 559 /* No return address is stored there.  */
 560 #define INCOMING_FRAME_SP_OFFSET 0
 561
 562 /* Node: Stack Checking */
 563 /* (empty) */
 564
 565
 566 /* Node: Exception Handling */
 567
 568 #define EH_RETURN_DATA_REGNO(N) \
 569  mmix_eh_return_data_regno (N)
 570
 571 #define EH_RETURN_STACKADJ_RTX \
 572  mmix_eh_return_stackadj_rtx ()
 573
 574 #define EH_RETURN_HANDLER_RTX \
 575  mmix_eh_return_handler_rtx ()
 576
 577 #define ASM_PREFERRED_EH_DATA_FORMAT(CODE, GLOBAL) \
 578  mmix_asm_preferred_eh_data_format (CODE, GLOBAL)
 579
 580 /* Node: Frame Registers */
 581 #define STACK_POINTER_REGNUM MMIX_STACK_POINTER_REGNUM
 582
 583 /* Perhaps we can use HARD_FRAME_POINTER_REGNUM and decide later on
 584    what register we want to use.  */
 585 #define FRAME_POINTER_REGNUM MMIX_FRAME_POINTER_REGNUM
 586 #define ARG_POINTER_REGNUM MMIX_ARG_POINTER_REGNUM
 587
 588 #define STATIC_CHAIN_REGNUM MMIX_STATIC_CHAIN_REGNUM
 589
 590
 591 /* Node: Elimination */
 592 /* FIXME: Is this requirement built-in?  Anyway, we should try to get rid
 593    of it; we can deduce the value.  */
 594 #define FRAME_POINTER_REQUIRED  current_function_has_nonlocal_label
 595
 596 /* The frame-pointer is stored in a location that either counts to the
 597    offset of incoming parameters, or that counts to the offset of the
 598    frame, so we can't use a single offset.  We therefore eliminate those
 599    two separately.  */
 600 #define ELIMINABLE_REGS                         \
 601  {{ARG_POINTER_REGNUM, STACK_POINTER_REGNUM},   \
 602   {ARG_POINTER_REGNUM, FRAME_POINTER_REGNUM},   \
 603   {FRAME_POINTER_REGNUM, STACK_POINTER_REGNUM}}
 604
 605 /* We need not worry about when the frame-pointer is required for other
 606    reasons; GCC takes care of those cases.  */
 607 #define CAN_ELIMINATE(FROM, TO) 1
 608
 609 #define INITIAL_ELIMINATION_OFFSET(FROM, TO, OFFSET) \
 610  (OFFSET) = mmix_initial_elimination_offset (FROM, TO)
 611
 612
 613 /* Node: Stack Arguments */
 614
 615 #define ACCUMULATE_OUTGOING_ARGS 1
 616
 617 #define RETURN_POPS_ARGS(FUNDECL, FUNTYPE, STACKSIZE) 0
 618
 619
 620 /* Node: Register Arguments */
 621 #define FUNCTION_ARG(CUM, MODE, TYPE, NAMED)    \
 622  mmix_function_arg (&(CUM), MODE, TYPE, NAMED, 0)
 623
 624 #define FUNCTION_INCOMING_ARG(CUM, MODE, TYPE, NAMED)   \
 625  mmix_function_arg (&(CUM), MODE, TYPE, NAMED, 1)
 626
 627 typedef struct { int regs; int lib; } CUMULATIVE_ARGS;
 628
 629 #define INIT_CUMULATIVE_ARGS(CUM, FNTYPE, LIBNAME, INDIRECT, N_NAMED_ARGS) \
 630  ((CUM).regs = 0, (CUM).lib = ((LIBNAME) != 0))
 631
 632 #define FUNCTION_ARG_ADVANCE(CUM, MODE, TYPE, NAMED)            \
 633  ((CUM).regs                                                    \
 634   = ((targetm.calls.must_pass_in_stack (MODE, TYPE))            \
 635      || (MMIX_FUNCTION_ARG_SIZE (MODE, TYPE) > 8                \
 636          && !TARGET_LIBFUNC && !(CUM).lib))                     \
 637   ? (MMIX_MAX_ARGS_IN_REGS) + 1                                 \
 638   : (CUM).regs + (7 + (MMIX_FUNCTION_ARG_SIZE (MODE, TYPE))) / 8)
 639
 640 #define FUNCTION_ARG_REGNO_P(REGNO)             \
 641  mmix_function_arg_regno_p (REGNO, 0)
 642
 643
 644 /* Node: Register Arguments */
 645
 646 #define FUNCTION_VALUE(VALTYPE, FUNC)  \
 647  gen_rtx_REG (TYPE_MODE (VALTYPE), MMIX_RETURN_VALUE_REGNUM)
 648
 649 /* This needs to take care of the register hole for complex return values.  */
 650 #define FUNCTION_OUTGOING_VALUE(VALTYPE, FUNC)  \
 651  mmix_function_outgoing_value (VALTYPE, FUNC)
 652
 653 #define LIBCALL_VALUE(MODE) \
 654  gen_rtx_REG (MODE, MMIX_RETURN_VALUE_REGNUM)
 655
 656 #define FUNCTION_VALUE_REGNO_P(REGNO) \
 657  mmix_function_value_regno_p (REGNO)
 658
 659
 660 /* Node: Caller Saves */
 661 /* (empty) */
 662
 663
 664 /* Node: Function Entry */
 665
 666 /* See mmix.c for TARGET_ASM_FUNCTION_PROLOGUE and
 667    TARGET_ASM_FUNCTION_EPILOGUE.  */
 668
 669 /* We need to say that the epilogue uses the return address, so the
 670    initial-value machinery restores it.  FIXME: Some targets
 671    conditionalize on "reload_completed &&".  Investigate difference.
 672    FIXME: Not needed if nonlocal_goto_stack_level.  */
 673 #define EPILOGUE_USES(REGNO) \
 674  ((REGNO) == MMIX_INCOMING_RETURN_ADDRESS_REGNUM)
 675
 676 /* Node: Profiling */
 677 #define FUNCTION_PROFILER(FILE, LABELNO)        \
 678  mmix_function_profiler (FILE, LABELNO)
 679
 680 /* Node: Trampolines */
 681
 682 #define TRAMPOLINE_TEMPLATE(FILE) \
 683  mmix_trampoline_template (FILE)
 684
 685 #define TRAMPOLINE_SIZE mmix_trampoline_size
 686 #define INITIALIZE_TRAMPOLINE(ADDR, FNADDR, STATIC_CHAIN) \
 687  mmix_initialize_trampoline (ADDR, FNADDR, STATIC_CHAIN)
 688
 689
 690 /* Node: Addressing Modes */
 691
 692 #define CONSTANT_ADDRESS_P(X) \
 693  mmix_constant_address_p (X)
 694
 695 #define MAX_REGS_PER_ADDRESS 2
 696
 697 #define GO_IF_LEGITIMATE_ADDRESS(MODE, X, LABEL)                \
 698  if (mmix_legitimate_address (MODE, X, MMIX_REG_OK_STRICT))     \
 699    goto LABEL
 700
 701 #ifndef REG_OK_STRICT
 702 # define REG_OK_FOR_BASE_P(X)                   \
 703   (REGNO (X) <= MMIX_LAST_GENERAL_REGISTER      \
 704    || REGNO (X) == MMIX_ARG_POINTER_REGNUM      \
 705    || REGNO (X) >= FIRST_PSEUDO_REGISTER)
 706 #else
 707 # define REG_OK_FOR_BASE_P(X) REGNO_OK_FOR_BASE_P (REGNO (X))
 708 #endif /* REG_OK_STRICT */
 709
 710 #define REG_OK_FOR_INDEX_P(X) REG_OK_FOR_BASE_P (X)
 711
 712 #define GO_IF_MODE_DEPENDENT_ADDRESS(ADDR, LABEL)
 713
 714 #define LEGITIMATE_CONSTANT_P(X) \
 715  mmix_legitimate_constant_p (X)
 716
 717
 718 /* Node: Condition Code */
 719
 720 #define SELECT_CC_MODE(OP, X, Y)                \
 721  mmix_select_cc_mode (OP, X, Y)
 722
 723 /* A definition of CANONICALIZE_COMPARISON that changed LE and GT
 724    comparisons with -1 to LT and GE respectively, and LT, LTU, GE or GEU
 725    comparisons with 256 to 255 and LE, LEU, GT and GTU has been
 726    ineffective; the code path for performing the changes did not trig for
 727    neither the GCC testsuite nor ghostscript-6.52 nor Knuth's mmix.tar.gz
 728    itself (core GCC functionality supposedly handling it) with sources
 729    from 2002-06-06.  */
 730
 731 #define REVERSIBLE_CC_MODE(MODE)                \
 732  mmix_reversible_cc_mode (MODE)
 733
 734
 735 /* Node: Costs */
 736
 737 /* The special registers can only move to and from general regs, and we
 738    need to check that their constraints match, so say 3 for them.  */
 739 /* WARNING: gcc-2.7.2.2 i686-pc-linux-gnulibc1 (as shipped with RH 4.2)
 740    miscompiles reload1.c:reload_cse_simplify_set; a call to
 741    reload_cse_regno_equal_p is missing when checking if a substitution of
 742    a register setting is valid if this is defined to just the expression
 743    in mmix_register_move_cost.
 744
 745    Symptom: a (all?) register setting is optimized away for e.g.
 746    "char *p1(char *p) { return p+1; }" and the value of register zero ($0)
 747    is returned.
 748
 749    We can workaround by making this a function call - unknown if this
 750    causes dire speed effects.  */
 751 #define REGISTER_MOVE_COST(MODE, FROM, TO) \
 752  mmix_register_move_cost (MODE, FROM, TO)
 753
 754 #define SLOW_BYTE_ACCESS 0
 755
 756
 757 /* Node: Sections */
 758
 759 /* This must be a constant string, since it's used in crtstuff.c.  */
 760 #define TEXT_SECTION_ASM_OP \
 761  "\t.text ! mmixal:= 9H LOC 8B"
 762
 763 /* FIXME: Not documented.  */
 764 #define DATA_SECTION_ASM_OP \
 765  mmix_data_section_asm_op ()
 766
 767 #define READONLY_DATA_SECTION_ASM_OP    "\t.section\t.rodata"
 768
 769 /* Node: PIC */
 770 /* (empty) */
 771
 772
 773 /* Node: File Framework */
 774
 775 /* While any other punctuation character but ";" would do, we prefer "%"
 776    or "!"; "!" is an unary operator and so will not be mistakenly included
 777    in correctly formed expressions.  The hash character adds mass; catches
 778    the eye.  We can't have it as a comment char by itself, since it's a
 779    hex-number prefix.  */
 780 #define ASM_COMMENT_START "!#"
 781
 782 /* These aren't currently functional.  We just keep them as markers.  */
 783 #define ASM_APP_ON "%APP\n"
 784 #define ASM_APP_OFF "%NO_APP\n"
 785
 786 #define ASM_OUTPUT_SOURCE_FILENAME(STREAM, NAME) \
 787  mmix_asm_output_source_filename (STREAM, NAME)
 788
 789 #define OUTPUT_QUOTED_STRING(STREAM, STRING) \
 790  mmix_output_quoted_string (STREAM, STRING, strlen (STRING))
 791
 792 #define TARGET_ASM_NAMED_SECTION default_elf_asm_named_section
 793
 794 /* Node: Data Output */
 795
 796 #define ASM_OUTPUT_ASCII(STREAM, PTR, LEN) \
 797  mmix_asm_output_ascii (STREAM, PTR, LEN)
 798
 799 /* Node: Uninitialized Data */
 800
 801 #define ASM_OUTPUT_ALIGNED_COMMON(ST, N, S, A) \
 802  mmix_asm_output_aligned_common (ST, N, S, A)
 803
 804 #define ASM_OUTPUT_ALIGNED_LOCAL(ST, N, S, A) \
 805  mmix_asm_output_aligned_local (ST, N, S, A)
 806
 807
 808 /* Node: Label Output */
 809
 810 #define ASM_OUTPUT_LABEL(STREAM, NAME) \
 811  mmix_asm_output_label (STREAM, NAME)
 812
 813 #define ASM_OUTPUT_INTERNAL_LABEL(STREAM, NAME) \
 814  mmix_asm_output_internal_label (STREAM, NAME)
 815
 816 #define ASM_DECLARE_REGISTER_GLOBAL(STREAM, DECL, REGNO, NAME) \
 817  mmix_asm_declare_register_global (STREAM, DECL, REGNO, NAME)
 818
 819 #define GLOBAL_ASM_OP "\t.global "
 820
 821 #define ASM_WEAKEN_LABEL(STREAM, NAME) \
 822  mmix_asm_weaken_label (STREAM, NAME)
 823
 824 #define MAKE_DECL_ONE_ONLY(DECL) \
 825  mmix_make_decl_one_only (DECL)
 826
 827 #define ASM_OUTPUT_LABELREF(STREAM, NAME) \
 828  mmix_asm_output_labelref (STREAM, NAME)
 829
 830 /* We insert a ":" to disambiguate against user symbols like L5.  */
 831 #define ASM_GENERATE_INTERNAL_LABEL(LABEL, PREFIX, NUM) \
 832  sprintf (LABEL, "*%s:%ld", PREFIX, (long)(NUM))
 833
 834 /* Insert "::"; these are rarer than internal labels.  FIXME: Make sure no
 835    ":" is seen in the object file; we don't really want that mmixal
 836    feature visible there.  We don't want the default, which uses a dot;
 837    that'd be incompatible with mmixal.  */
 838 #define ASM_PN_FORMAT "%s::%lu"
 839
 840 #define ASM_OUTPUT_DEF(STREAM, NAME, VALUE) \
 841  mmix_asm_output_def (STREAM, NAME, VALUE)
 842
 843 /* Node: Macros for Initialization */
 844 /* We're compiling to ELF and linking to MMO; fundamental ELF features
 845    that GCC depend on are there.  */
 846
 847 /* These must be constant strings, since they're used in crtstuff.c.  */
 848 #define INIT_SECTION_ASM_OP "\t.section .init,\"ax\" ! mmixal-incompatible"
 849
 850 #define FINI_SECTION_ASM_OP "\t.section .fini,\"ax\" ! mmixal-incompatible"
 851
 852 #define OBJECT_FORMAT_ELF
 853
 854
 855 /* Node: Instruction Output */
 856
 857 /* The non-$ register names must be prefixed with ":", since they're
 858    affected by PREFIX.  We provide the non-colon names as additional
 859    names.  */
 860 #define REGISTER_NAMES                                                  \
 861  {"$0", "$1", "$2", "$3", "$4", "$5", "$6", "$7",                       \
 862   "$8", "$9", "$10", "$11", "$12", "$13", "$14", "$15",                 \
 863   "$16", "$17", "$18", "$19", "$20", "$21", "$22", "$23",               \
 864   "$24", "$25", "$26", "$27", "$28", "$29", "$30", "$31",               \
 865   "$32", "$33", "$34", "$35", "$36", "$37", "$38", "$39",               \
 866   "$40", "$41", "$42", "$43", "$44", "$45", "$46", "$47",               \
 867   "$48", "$49", "$50", "$51", "$52", "$53", "$54", "$55",               \
 868   "$56", "$57", "$58", "$59", "$60", "$61", "$62", "$63",               \
 869   "$64", "$65", "$66", "$67", "$68", "$69", "$70", "$71",               \
 870   "$72", "$73", "$74", "$75", "$76", "$77", "$78", "$79",               \
 871   "$80", "$81", "$82", "$83", "$84", "$85", "$86", "$87",               \
 872   "$88", "$89", "$90", "$91", "$92", "$93", "$94", "$95",               \
 873   "$96", "$97", "$98", "$99", "$100", "$101", "$102", "$103",           \
 874   "$104", "$105", "$106", "$107", "$108", "$109", "$110", "$111",       \
 875   "$112", "$113", "$114", "$115", "$116", "$117", "$118", "$119",       \
 876   "$120", "$121", "$122", "$123", "$124", "$125", "$126", "$127",       \
 877   "$128", "$129", "$130", "$131", "$132", "$133", "$134", "$135",       \
 878   "$136", "$137", "$138", "$139", "$140", "$141", "$142", "$143",       \
 879   "$144", "$145", "$146", "$147", "$148", "$149", "$150", "$151",       \
 880   "$152", "$153", "$154", "$155", "$156", "$157", "$158", "$159",       \
 881   "$160", "$161", "$162", "$163", "$164", "$165", "$166", "$167",       \
 882   "$168", "$169", "$170", "$171", "$172", "$173", "$174", "$175",       \
 883   "$176", "$177", "$178", "$179", "$180", "$181", "$182", "$183",       \
 884   "$184", "$185", "$186", "$187", "$188", "$189", "$190", "$191",       \
 885   "$192", "$193", "$194", "$195", "$196", "$197", "$198", "$199",       \
 886   "$200", "$201", "$202", "$203", "$204", "$205", "$206", "$207",       \
 887   "$208", "$209", "$210", "$211", "$212", "$213", "$214", "$215",       \
 888   "$216", "$217", "$218", "$219", "$220", "$221", "$222", "$223",       \
 889   "$224", "$225", "$226", "$227", "$228", "$229", "$230", "$231",       \
 890   "$232", "$233", "$234", "$235", "$236", "$237", "$238", "$239",       \
 891   "$240", "$241", "$242", "$243", "$244", "$245", "$246", "$247",       \
 892   "$248", "$249", "$250", "$251", "$252", "$253", "$254", "$255",       \
 893   ":rD",  ":rE",  ":rH",  ":rJ",  ":rR",  "ap_!BAD!", ":rO"}
 894
 895 #define ADDITIONAL_REGISTER_NAMES                       \
 896  {{"sp", 254}, {":sp", 254}, {"rD", 256}, {"rE", 257},  \
 897   {"rH", 258}, {"rJ", MMIX_rJ_REGNUM}, {"rO", MMIX_rO_REGNUM}}
 898
 899 #define PRINT_OPERAND(STREAM, X, CODE) \
 900  mmix_print_operand (STREAM, X, CODE)
 901
 902 #define PRINT_OPERAND_PUNCT_VALID_P(CODE) \
 903  mmix_print_operand_punct_valid_p (CODE)
 904
 905 #define PRINT_OPERAND_ADDRESS(STREAM, X) \
 906  mmix_print_operand_address (STREAM, X)
 907
 908 #define ASM_OUTPUT_REG_PUSH(STREAM, REGNO) \
 909  mmix_asm_output_reg_push (STREAM, REGNO)
 910
 911 #define ASM_OUTPUT_REG_POP(STREAM, REGNO) \
 912  mmix_asm_output_reg_pop (STREAM, REGNO)
 913
 914
 915 /* Node: Dispatch Tables */
 916
 917 /* We define both types, since SImode is the better, but DImode the only
 918    possible for mmixal so that's the one actually used.  */
 919 #define ASM_OUTPUT_ADDR_DIFF_ELT(STREAM, BODY, VALUE, REL) \
 920  mmix_asm_output_addr_diff_elt (STREAM, BODY, VALUE, REL)
 921
 922 #define ASM_OUTPUT_ADDR_VEC_ELT(STREAM, VALUE) \
 923  mmix_asm_output_addr_vec_elt (STREAM, VALUE)
 924
 925
 926 /* Node: Exception Region Output */
 927 /* (empty) */
 928
 929 /* Node: Alignment Output */
 930
 931 #define ASM_OUTPUT_SKIP(STREAM, NBYTES) \
 932  mmix_asm_output_skip (STREAM, NBYTES)
 933
 934 #define ASM_OUTPUT_ALIGN(STREAM, POWER) \
 935  mmix_asm_output_align (STREAM, POWER)
 936
 937
 938 /* Node: All Debuggers */
 939
 940 #define DBX_REGISTER_NUMBER(REGNO) \
 941  mmix_dbx_register_number (REGNO)
 942
 943
 944 /* Node: DBX Options */
 945 /* (empty) */
 946 /* Node: DBX Hooks */
 947 /* (empty) */
 948 /* Node: File Names and DBX */
 949 /* (empty) */
 950
 951
 952 /* Node: SDB and DWARF */
 953 #define DWARF2_DEBUGGING_INFO 1
 954 #define DWARF2_ASM_LINE_DEBUG_INFO 1
 955
 956 /* Node: Misc */
 957
 958 /* There's no way to get a PC-relative offset into tables for SImode, so
 959    for the moment we have absolute entries in DImode.
 960    When we're going ELF, these should be SImode and 1.  */
 961 #define CASE_VECTOR_MODE DImode
 962 #define CASE_VECTOR_PC_RELATIVE 0
 963
 964 #define WORD_REGISTER_OPERATIONS
 965
 966 /* We have a choice, which makes this yet another parameter to tweak.  The
 967    gut feeling is currently that SIGN_EXTEND wins; "int" is more frequent
 968    than "unsigned int", and we have signed characters.  FIXME: measure.  */
 969 #define LOAD_EXTEND_OP(MODE) (TARGET_ZERO_EXTEND ? ZERO_EXTEND : SIGN_EXTEND)
 970
 971 #define MOVE_MAX 8
 972
 973 #define TRULY_NOOP_TRUNCATION(OUTPREC, INPREC) 1
 974
 975 /* ??? MMIX allows a choice of STORE_FLAG_VALUE.  Revisit later,
 976    we don't have scc expanders yet.  */
 977
 978 #define Pmode DImode
 979
 980 #define FUNCTION_MODE QImode
 981
 982 #define NO_IMPLICIT_EXTERN_C
 983
 984 #define HANDLE_SYSV_PRAGMA 1
 985
 986 /* These are checked.  */
 987 #define DOLLARS_IN_IDENTIFIERS 0
 988 #define NO_DOLLAR_IN_LABEL
 989 #define NO_DOT_IN_LABEL
 990
 991 #endif /* GCC_MMIX_H */
 992 /*
 993  * Local variables:
 994  * eval: (c-set-style "gnu")
 995  * indent-tabs-mode: t
 996  * End:
 997  */