gcc/config/mmix/mmix.h

   1 /* Definitions of target machine for GNU compiler, for MMIX.
   2    Copyright (C) 2000, 2001, 2002, 2004 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 2, 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 COPYING.  If not, write to
  19 the Free Software Foundation, 59 Temple Place - Suite 330,
  20 Boston, MA 02111-1307, USA.  */
  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           flag_strength_reduce = FALSE;         \
 169         }                                       \
 170     }                                           \
 171   while (0)
 172
 173 /* This one will have to wait a little bit; right now we can't debug
 174    neither with or without a frame-pointer.  */
 175 /* #define CAN_DEBUG_WITHOUT_FP */
 176
 177
 178 /* Node: Per-Function Data */
 179 #define INIT_EXPANDERS mmix_init_expanders ()
 180
 181
 182 /* Node: Storage Layout */
 183 /* I see no bit-field instructions.  Anyway, the common order is from low
 184    to high, as the power of two, hence little-endian.  */
 185 #define BITS_BIG_ENDIAN 0
 186 #define BYTES_BIG_ENDIAN 1
 187 #define WORDS_BIG_ENDIAN 1
 188 #define FLOAT_WORDS_BIG_ENDIAN 1
 189 #define UNITS_PER_WORD 8
 190
 191 /* FIXME: Promotion of modes currently generates slow code, extending
 192    before every operation.  */
 193 /* I'm a little bit undecided about this one.  It might be beneficial to
 194    promote all operations.  */
 195
 196 #define PROMOTE_FUNCTION_MODE(MODE, UNSIGNEDP, TYPE)    \
 197  do {                                           \
 198   if (GET_MODE_CLASS (MODE) == MODE_INT         \
 199       && GET_MODE_SIZE (MODE) < 8)              \
 200    {                                            \
 201      (MODE) = DImode;                           \
 202      /* Do the following some time later,       \
 203         scrutinizing differences.  */           \
 204      if (0) (UNSIGNEDP) = 0;                    \
 205    }                                            \
 206  } while (0)
 207
 208 /* We need to align everything to 64 bits that can affect the alignment
 209    of other types.  Since address N is interpreted in MMIX as (N modulo
 210    access_size), we must align.  */
 211 #define PARM_BOUNDARY 64
 212 #define STACK_BOUNDARY 64
 213 #define FUNCTION_BOUNDARY 32
 214 #define BIGGEST_ALIGNMENT 64
 215
 216 /* This one is only used in the ADA front end.  */
 217 #define MINIMUM_ATOMIC_ALIGNMENT 8
 218
 219 /* Copied from elfos.h.  */
 220 #define MAX_OFILE_ALIGNMENT (32768 * 8)
 221
 222 #define DATA_ALIGNMENT(TYPE, BASIC_ALIGN) \
 223  mmix_data_alignment (TYPE, BASIC_ALIGN)
 224
 225 #define CONSTANT_ALIGNMENT(CONSTANT, BASIC_ALIGN) \
 226  mmix_constant_alignment (CONSTANT, BASIC_ALIGN)
 227
 228 #define LOCAL_ALIGNMENT(TYPE, BASIC_ALIGN) \
 229  mmix_local_alignment (TYPE, BASIC_ALIGN)
 230
 231 /* Following other ports, this seems to most commonly be the word-size,
 232    so let's do that here too.  */
 233 #define EMPTY_FIELD_BOUNDARY 64
 234
 235 /* We chose to have this low solely for similarity with the alpha.  It has
 236    nothing to do with passing the tests dg/c99-scope-2 and
 237    execute/align-1.c.  Nothing.  Though the tests seem wrong.  Padding of
 238    the structure is automatically added to get alignment when needed if we
 239    set this to just byte-boundary.  */
 240 #define STRUCTURE_SIZE_BOUNDARY 8
 241
 242 /* The lower bits are ignored.  */
 243 #define STRICT_ALIGNMENT 1
 244
 245
 246 /* Node: Type Layout */
 247
 248 /* It might seem more natural to have 64-bit ints on a 64-bit machine,
 249    but then an occasional MMIX programmer needs to know how to put a lot
 250    of __attribute__ stuff to get to the 8, 16 and 32-bit modes rather
 251    than the "intuitive" char, short and int types.  */
 252 #define INT_TYPE_SIZE 32
 253 #define SHORT_TYPE_SIZE 16
 254 #define LONG_LONG_TYPE_SIZE 64
 255
 256 #define FLOAT_TYPE_SIZE 32
 257 #define DOUBLE_TYPE_SIZE 64
 258 #define LONG_DOUBLE_TYPE_SIZE 64
 259
 260 #define DEFAULT_SIGNED_CHAR 1
 261
 262
 263 /* Node: Register Basics */
 264 /* We tell GCC about all 256 general registers, and we also include
 265    rD, rE, rH, rJ, rR and rO (in that order) so we can describe what insns
 266    clobber them.  We use a faked register for the argument pointer.  It is
 267    always eliminated towards the frame-pointer or the stack-pointer, never
 268    output in assembly.  Any fixed register would do for this, like $255,
 269    but future debugging is easier when using a separate register.  It
 270    counts as a global register for pseudorandom reasons.  */
 271 #define FIRST_PSEUDO_REGISTER 263
 272
 273 /* We treat general registers with no assigned purpose as fixed.  The
 274    stack pointer, $254, is also fixed.  Register $255 is referred to as a
 275    temporary register in the MMIX papers, and used as such in mmixal, so
 276    it should not be used as a stack pointer.  We set it to fixed, and use
 277    it "manually" at times of despair.  */
 278 #define FIXED_REGISTERS \
 279  { 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, \
 280    0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, \
 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, 1, 1, 1, 1, 1, 1, 1, 1, 1, \
 294    1, 1, 1, 1, 1, 1, 1, 0, 0, 0, 0, 0, 0, 0, 1, 1, \
 295    1, 1, 0, 0, 0, 1, 1 \
 296  }
 297
 298 /* General registers are fixed and therefore "historically" marked
 299    call-used.  (FIXME: This has changed).  Registers $15..$31 are
 300    call-clobbered; we'll put arguments in $16 and up, and we need $15 for
 301    the MMIX register-stack "hole".  */
 302 #define CALL_USED_REGISTERS \
 303  { 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 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, 1, 1, 1, \
 318    1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 0, 1, 1, \
 319    1, 1, 1, 1, 1, 1, 1 \
 320  }
 321
 322 #define CONDITIONAL_REGISTER_USAGE mmix_conditional_register_usage ()
 323
 324 /* No INCOMING_REGNO or OUTGOING_REGNO, since those macros are not usable
 325    for MMIX: it doesn't have a fixed register window size.  FIXME: Perhaps
 326    we should say something about $0..$15 may sometimes be the incoming
 327    $16..$31.  Those macros need better documentation; it looks like
 328    they're just bogus and that FUNCTION_INCOMING_ARG_REGNO_P and
 329    FUNCTION_OUTGOING_VALUE should be used where they're used.  For the
 330    moment, do nothing; things seem to work anyway.  */
 331
 332 /* Defining LOCAL_REGNO is necessary in presence of prologue/epilogue,
 333    else GCC will be confused that those registers aren't saved and
 334    restored.  */
 335 #define LOCAL_REGNO(REGNO) mmix_local_regno (REGNO)
 336
 337 /* Node: Allocation Order */
 338
 339 /* We should allocate registers from 0 to 31 by increasing number, because
 340    I think that's what people expect.  Beyond that, just use
 341    call-clobbered global registers first, then call-clobbered special
 342    registers.  Last, the fixed registers.  */
 343 #define MMIX_MMIXWARE_ABI_REG_ALLOC_ORDER       \
 344  { 0, 1, 2, 3, 4, 5, 6, 7,                      \
 345    8, 9, 10, 11, 12, 13, 14, 15,                \
 346    16, 17, 18, 19, 20, 21, 22, 23,              \
 347    24, 25, 26, 27, 28, 29, 30, 31,              \
 348                                                 \
 349    252, 251, 250, 249, 248, 247,                \
 350                                                 \
 351    253,                                         \
 352                                                 \
 353    258, 260, 259,                               \
 354                                                 \
 355    32, 33, 34, 35, 36, 37, 38, 39,              \
 356    40, 41, 42, 43, 44, 45, 46, 47,              \
 357    48, 49, 50, 51, 52, 53, 54, 55,              \
 358    56, 57, 58, 59, 60, 61, 62, 63,              \
 359    64, 65, 66, 67, 68, 69, 70, 71,              \
 360    72, 73, 74, 75, 76, 77, 78, 79,              \
 361    80, 81, 82, 83, 84, 85, 86, 87,              \
 362    88, 89, 90, 91, 92, 93, 94, 95,              \
 363    96, 97, 98, 99, 100, 101, 102, 103,          \
 364    104, 105, 106, 107, 108, 109, 110, 111,      \
 365    112, 113, 114, 115, 116, 117, 118, 119,      \
 366    120, 121, 122, 123, 124, 125, 126, 127,      \
 367    128, 129, 130, 131, 132, 133, 134, 135,      \
 368    136, 137, 138, 139, 140, 141, 142, 143,      \
 369    144, 145, 146, 147, 148, 149, 150, 151,      \
 370    152, 153, 154, 155, 156, 157, 158, 159,      \
 371    160, 161, 162, 163, 164, 165, 166, 167,      \
 372    168, 169, 170, 171, 172, 173, 174, 175,      \
 373    176, 177, 178, 179, 180, 181, 182, 183,      \
 374    184, 185, 186, 187, 188, 189, 190, 191,      \
 375    192, 193, 194, 195, 196, 197, 198, 199,      \
 376    200, 201, 202, 203, 204, 205, 206, 207,      \
 377    208, 209, 210, 211, 212, 213, 214, 215,      \
 378    216, 217, 218, 219, 220, 221, 222, 223,      \
 379    224, 225, 226, 227, 228, 229, 230, 231,      \
 380    232, 233, 234, 235, 236, 237, 238, 239,      \
 381    240, 241, 242, 243, 244, 245, 246,           \
 382                                                 \
 383    254, 255, 256, 257, 261, 262                 \
 384  }
 385
 386 /* As a convenience, we put this nearby, for ease of comparison.
 387    First, call-clobbered registers in reverse order of assignment as
 388    parameters (also the top ones; not because they're parameters, but
 389    for continuity).
 390
 391    Second, saved registers that go on the register-stack.
 392
 393    Third, special registers rH, rR and rJ.  They should not normally be
 394    allocated, but since they're call-clobbered, it is cheaper to use one
 395    of them than using a call-saved register for a call-clobbered use,
 396    assuming it is referenced a very limited number of times.  Other global
 397    and fixed registers come next; they are never allocated.  */
 398 #define MMIX_GNU_ABI_REG_ALLOC_ORDER            \
 399  { 252, 251, 250, 249, 248, 247, 246,           \
 400    245, 244, 243, 242, 241, 240, 239, 238,      \
 401    237, 236, 235, 234, 233, 232, 231,           \
 402                                                 \
 403    0, 1, 2, 3, 4, 5, 6, 7,                      \
 404    8, 9, 10, 11, 12, 13, 14, 15,                \
 405    16, 17, 18, 19, 20, 21, 22, 23,              \
 406    24, 25, 26, 27, 28, 29, 30, 31,              \
 407                                                 \
 408    253,                                         \
 409                                                 \
 410    258, 260, 259,                               \
 411                                                 \
 412    32, 33, 34, 35, 36, 37, 38, 39,              \
 413    40, 41, 42, 43, 44, 45, 46, 47,              \
 414    48, 49, 50, 51, 52, 53, 54, 55,              \
 415    56, 57, 58, 59, 60, 61, 62, 63,              \
 416    64, 65, 66, 67, 68, 69, 70, 71,              \
 417    72, 73, 74, 75, 76, 77, 78, 79,              \
 418    80, 81, 82, 83, 84, 85, 86, 87,              \
 419    88, 89, 90, 91, 92, 93, 94, 95,              \
 420    96, 97, 98, 99, 100, 101, 102, 103,          \
 421    104, 105, 106, 107, 108, 109, 110, 111,      \
 422    112, 113, 114, 115, 116, 117, 118, 119,      \
 423    120, 121, 122, 123, 124, 125, 126, 127,      \
 424    128, 129, 130, 131, 132, 133, 134, 135,      \
 425    136, 137, 138, 139, 140, 141, 142, 143,      \
 426    144, 145, 146, 147, 148, 149, 150, 151,      \
 427    152, 153, 154, 155, 156, 157, 158, 159,      \
 428    160, 161, 162, 163, 164, 165, 166, 167,      \
 429    168, 169, 170, 171, 172, 173, 174, 175,      \
 430    176, 177, 178, 179, 180, 181, 182, 183,      \
 431    184, 185, 186, 187, 188, 189, 190, 191,      \
 432    192, 193, 194, 195, 196, 197, 198, 199,      \
 433    200, 201, 202, 203, 204, 205, 206, 207,      \
 434    208, 209, 210, 211, 212, 213, 214, 215,      \
 435    216, 217, 218, 219, 220, 221, 222, 223,      \
 436    224, 225, 226, 227, 228, 229, 230,           \
 437                                                 \
 438    254, 255, 256, 257, 261, 262                 \
 439  }
 440
 441 /* The default one.  */
 442 #define REG_ALLOC_ORDER MMIX_MMIXWARE_ABI_REG_ALLOC_ORDER
 443
 444 /* Node: Values in Registers */
 445
 446 #define HARD_REGNO_NREGS(REGNO, MODE)                   \
 447    ((GET_MODE_SIZE (MODE) + UNITS_PER_WORD - 1)         \
 448     / UNITS_PER_WORD)
 449
 450 #define HARD_REGNO_MODE_OK(REGNO, MODE) 1
 451
 452 /* Note that no register can really be accessed in single-float mode, so
 453    we *can* say 1 here.  FIXME:  Will TRT happen for single-float, or do
 454    we have to punt to libgcc1.asm?  */
 455 #define MODES_TIEABLE_P(MODE1, MODE2) 1
 456
 457
 458 /* Node: Leaf Functions */
 459 /* (empty) */
 460
 461
 462 /* Node: Register Classes */
 463
 464 enum reg_class
 465  {
 466    NO_REGS, GENERAL_REGS, REMAINDER_REG, HIMULT_REG,
 467    SYSTEM_REGS, ALL_REGS, LIM_REG_CLASSES
 468  };
 469
 470 #define N_REG_CLASSES (int) LIM_REG_CLASSES
 471
 472 #define REG_CLASS_NAMES                                         \
 473  {"NO_REGS", "GENERAL_REGS", "REMAINDER_REG", "HIMULT_REG",     \
 474   "SYSTEM_REGS", "ALL_REGS"}
 475
 476 /* Note that the contents of each item is always 32 bits.  */
 477 #define REG_CLASS_CONTENTS                      \
 478  {{0, 0, 0, 0, 0, 0, 0, 0, 0},                  \
 479   {~0, ~0, ~0, ~0, ~0, ~0, ~0, ~0, 0x20},       \
 480   {0, 0, 0, 0, 0, 0, 0, 0, 0x10},               \
 481   {0, 0, 0, 0, 0, 0, 0, 0, 4},                  \
 482   {0, 0, 0, 0, 0, 0, 0, 0, 0x7f},               \
 483   {~0, ~0, ~0, ~0, ~0, ~0, ~0, ~0, 0x7f}}
 484
 485 #define REGNO_REG_CLASS(REGNO)                                  \
 486  ((REGNO) <= MMIX_LAST_GENERAL_REGISTER                         \
 487   || (REGNO) == MMIX_ARG_POINTER_REGNUM                         \
 488   ? GENERAL_REGS                                                \
 489   : (REGNO) == MMIX_REMAINDER_REGNUM ? REMAINDER_REG            \
 490   : (REGNO) == MMIX_HIMULT_REGNUM ? HIMULT_REG : SYSTEM_REGS)
 491
 492 #define BASE_REG_CLASS GENERAL_REGS
 493
 494 #define INDEX_REG_CLASS GENERAL_REGS
 495
 496 #define REG_CLASS_FROM_LETTER(CHAR)             \
 497  ((CHAR) == 'x' ? SYSTEM_REGS                   \
 498   : (CHAR) == 'y' ? REMAINDER_REG               \
 499   : (CHAR) == 'z' ? HIMULT_REG : NO_REGS)
 500
 501 #define REGNO_OK_FOR_BASE_P(REGNO)                              \
 502  ((REGNO) <= MMIX_LAST_GENERAL_REGISTER                         \
 503   || (REGNO) == MMIX_ARG_POINTER_REGNUM                         \
 504   || (reg_renumber[REGNO] > 0                                   \
 505       && reg_renumber[REGNO] <= MMIX_LAST_GENERAL_REGISTER))
 506
 507 #define REGNO_OK_FOR_INDEX_P(REGNO) REGNO_OK_FOR_BASE_P (REGNO)
 508
 509 #define PREFERRED_RELOAD_CLASS(X, CLASS) \
 510  mmix_preferred_reload_class (X, CLASS)
 511
 512 #define PREFERRED_OUTPUT_RELOAD_CLASS(X, CLASS) \
 513  mmix_preferred_output_reload_class (X, CLASS)
 514
 515 #define SECONDARY_INPUT_RELOAD_CLASS(CLASS, MODE, X) \
 516  mmix_secondary_reload_class (CLASS, MODE, X, 1)
 517
 518 #define SECONDARY_OUTPUT_RELOAD_CLASS(CLASS, MODE, X) \
 519  mmix_secondary_reload_class (CLASS, MODE, X, 0)
 520
 521 #define CLASS_MAX_NREGS(CLASS, MODE) HARD_REGNO_NREGS (CLASS, MODE)
 522
 523 #define CONST_OK_FOR_LETTER_P(VALUE, C) \
 524  mmix_const_ok_for_letter_p (VALUE, C)
 525
 526 #define EXTRA_CONSTRAINT(VALUE, C)      \
 527  mmix_extra_constraint (VALUE, C, MMIX_REG_OK_STRICT)
 528
 529 /* Do we need anything serious here?  Yes, any FLOT constant.  */
 530 #define CONST_DOUBLE_OK_FOR_LETTER_P(VALUE, C)                  \
 531  mmix_const_double_ok_for_letter_p (VALUE, C)
 532
 533
 534 /* Node: Frame Layout */
 535
 536 #define STACK_GROWS_DOWNWARD
 537 #define FRAME_GROWS_DOWNWARD
 538
 539 #define STARTING_FRAME_OFFSET \
 540   mmix_starting_frame_offset ()
 541
 542 #define FIRST_PARM_OFFSET(FUNDECL) 0
 543
 544 #define DYNAMIC_CHAIN_ADDRESS(FRAMEADDR) \
 545  mmix_dynamic_chain_address (FRAMEADDR)
 546
 547 /* FIXME: It seems RETURN_ADDR_OFFSET is undocumented.  */
 548
 549 #define SETUP_FRAME_ADDRESSES() \
 550  mmix_setup_frame_addresses ()
 551
 552 #define RETURN_ADDR_RTX(COUNT, FRAME)           \
 553  mmix_return_addr_rtx (COUNT, FRAME)
 554
 555 /* It's in rJ before we store it somewhere.  */
 556 #define INCOMING_RETURN_ADDR_RTX \
 557  gen_rtx_REG (Pmode, MMIX_INCOMING_RETURN_ADDRESS_REGNUM)
 558
 559 /* FIXME: This does not seem properly documented or cross-indexed.
 560    Nowhere except in the code does it say it *has* to be in the range
 561    0..255, or else it will be truncated.  That goes for the default too.  */
 562 #define DWARF_FRAME_RETURN_COLUMN \
 563  DWARF_FRAME_REGNUM (MMIX_INCOMING_RETURN_ADDRESS_REGNUM)
 564
 565 /* No return address is stored there.  */
 566 #define INCOMING_FRAME_SP_OFFSET 0
 567
 568 /* Node: Stack Checking */
 569 /* (empty) */
 570
 571
 572 /* Node: Exception Handling */
 573
 574 #define EH_RETURN_DATA_REGNO(N) \
 575  mmix_eh_return_data_regno (N)
 576
 577 #define EH_RETURN_STACKADJ_RTX \
 578  mmix_eh_return_stackadj_rtx ()
 579
 580 #define EH_RETURN_HANDLER_RTX \
 581  mmix_eh_return_handler_rtx ()
 582
 583 #define ASM_PREFERRED_EH_DATA_FORMAT(CODE, GLOBAL) \
 584  mmix_asm_preferred_eh_data_format (CODE, GLOBAL)
 585
 586 /* Node: Frame Registers */
 587 #define STACK_POINTER_REGNUM MMIX_STACK_POINTER_REGNUM
 588
 589 /* Perhaps we can use HARD_FRAME_POINTER_REGNUM and decide later on
 590    what register we want to use.  */
 591 #define FRAME_POINTER_REGNUM MMIX_FRAME_POINTER_REGNUM
 592 #define ARG_POINTER_REGNUM MMIX_ARG_POINTER_REGNUM
 593
 594 #define STATIC_CHAIN_REGNUM MMIX_STATIC_CHAIN_REGNUM
 595
 596
 597 /* Node: Elimination */
 598 /* FIXME: Is this requirement built-in?  Anyway, we should try to get rid
 599    of it; we can deduce the value.  */
 600 #define FRAME_POINTER_REQUIRED  current_function_has_nonlocal_label
 601
 602 /* The frame-pointer is stored in a location that either counts to the
 603    offset of incoming parameters, or that counts to the offset of the
 604    frame, so we can't use a single offset.  We therefore eliminate those
 605    two separately.  */
 606 #define ELIMINABLE_REGS                         \
 607  {{ARG_POINTER_REGNUM, STACK_POINTER_REGNUM},   \
 608   {ARG_POINTER_REGNUM, FRAME_POINTER_REGNUM},   \
 609   {FRAME_POINTER_REGNUM, STACK_POINTER_REGNUM}}
 610
 611 /* We need not worry about when the frame-pointer is required for other
 612    reasons; GCC takes care of those cases.  */
 613 #define CAN_ELIMINATE(FROM, TO) 1
 614
 615 #define INITIAL_ELIMINATION_OFFSET(FROM, TO, OFFSET) \
 616  (OFFSET) = mmix_initial_elimination_offset (FROM, TO)
 617
 618
 619 /* Node: Stack Arguments */
 620
 621 #define ACCUMULATE_OUTGOING_ARGS 1
 622
 623 #define RETURN_POPS_ARGS(FUNDECL, FUNTYPE, STACKSIZE) 0
 624
 625
 626 /* Node: Register Arguments */
 627 #define FUNCTION_ARG(CUM, MODE, TYPE, NAMED)    \
 628  mmix_function_arg (&(CUM), MODE, TYPE, NAMED, 0)
 629
 630 #define FUNCTION_INCOMING_ARG(CUM, MODE, TYPE, NAMED)   \
 631  mmix_function_arg (&(CUM), MODE, TYPE, NAMED, 1)
 632
 633 typedef struct { int regs; int lib; } CUMULATIVE_ARGS;
 634
 635 #define INIT_CUMULATIVE_ARGS(CUM, FNTYPE, LIBNAME, INDIRECT, N_NAMED_ARGS) \
 636  ((CUM).regs = 0, (CUM).lib = ((LIBNAME) != 0))
 637
 638 #define FUNCTION_ARG_ADVANCE(CUM, MODE, TYPE, NAMED)            \
 639  ((CUM).regs                                                    \
 640   = ((targetm.calls.must_pass_in_stack (MODE, TYPE))            \
 641      || (MMIX_FUNCTION_ARG_SIZE (MODE, TYPE) > 8                \
 642          && !TARGET_LIBFUNC && !(CUM).lib))                     \
 643   ? (MMIX_MAX_ARGS_IN_REGS) + 1                                 \
 644   : (CUM).regs + (7 + (MMIX_FUNCTION_ARG_SIZE (MODE, TYPE))) / 8)
 645
 646 #define FUNCTION_ARG_REGNO_P(REGNO)             \
 647  mmix_function_arg_regno_p (REGNO, 0)
 648
 649 #define FUNCTION_INCOMING_ARG_REGNO_P(REGNO)            \
 650  mmix_function_arg_regno_p (REGNO, 1)
 651
 652
 653 /* Node: Register Arguments */
 654
 655 #define FUNCTION_VALUE(VALTYPE, FUNC)  \
 656  gen_rtx_REG (TYPE_MODE (VALTYPE), MMIX_RETURN_VALUE_REGNUM)
 657
 658 /* This needs to take care of the register hole for complex return values.  */
 659 #define FUNCTION_OUTGOING_VALUE(VALTYPE, FUNC)  \
 660  mmix_function_outgoing_value (VALTYPE, FUNC)
 661
 662 #define LIBCALL_VALUE(MODE) \
 663  gen_rtx_REG (MODE, MMIX_RETURN_VALUE_REGNUM)
 664
 665 #define FUNCTION_VALUE_REGNO_P(REGNO) \
 666  mmix_function_value_regno_p (REGNO)
 667
 668
 669 /* Node: Caller Saves */
 670 /* (empty) */
 671
 672
 673 /* Node: Function Entry */
 674
 675 /* See mmix.c for TARGET_ASM_FUNCTION_PROLOGUE and
 676    TARGET_ASM_FUNCTION_EPILOGUE.  */
 677
 678 /* We need to say that the epilogue uses the return address, so the
 679    initial-value machinery restores it.  FIXME: Some targets
 680    conditionalize on "reload_completed &&".  Investigate difference.
 681    FIXME: Not needed if nonlocal_goto_stack_level.  */
 682 #define EPILOGUE_USES(REGNO) \
 683  ((REGNO) == MMIX_INCOMING_RETURN_ADDRESS_REGNUM)
 684
 685 /* Node: Profiling */
 686 #define FUNCTION_PROFILER(FILE, LABELNO)        \
 687  mmix_function_profiler (FILE, LABELNO)
 688
 689 /* Node: Trampolines */
 690
 691 #define TRAMPOLINE_TEMPLATE(FILE) \
 692  mmix_trampoline_template (FILE)
 693
 694 #define TRAMPOLINE_SIZE mmix_trampoline_size
 695 #define INITIALIZE_TRAMPOLINE(ADDR, FNADDR, STATIC_CHAIN) \
 696  mmix_initialize_trampoline (ADDR, FNADDR, STATIC_CHAIN)
 697
 698
 699 /* Node: Addressing Modes */
 700
 701 #define CONSTANT_ADDRESS_P(X) \
 702  mmix_constant_address_p (X)
 703
 704 #define MAX_REGS_PER_ADDRESS 2
 705
 706 #define GO_IF_LEGITIMATE_ADDRESS(MODE, X, LABEL)                \
 707  if (mmix_legitimate_address (MODE, X, MMIX_REG_OK_STRICT))     \
 708    goto LABEL
 709
 710 #ifndef REG_OK_STRICT
 711 # define REG_OK_FOR_BASE_P(X)                   \
 712   (REGNO (X) <= MMIX_LAST_GENERAL_REGISTER      \
 713    || REGNO (X) == MMIX_ARG_POINTER_REGNUM      \
 714    || REGNO (X) >= FIRST_PSEUDO_REGISTER)
 715 #else
 716 # define REG_OK_FOR_BASE_P(X) REGNO_OK_FOR_BASE_P (REGNO (X))
 717 #endif /* REG_OK_STRICT */
 718
 719 #define REG_OK_FOR_INDEX_P(X) REG_OK_FOR_BASE_P (X)
 720
 721 #define GO_IF_MODE_DEPENDENT_ADDRESS(ADDR, LABEL)
 722
 723 #define LEGITIMATE_CONSTANT_P(X) \
 724  mmix_legitimate_constant_p (X)
 725
 726
 727 /* Node: Condition Code */
 728
 729 #define SELECT_CC_MODE(OP, X, Y)                \
 730  mmix_select_cc_mode (OP, X, Y)
 731
 732 /* A definition of CANONICALIZE_COMPARISON that changed LE and GT
 733    comparisons with -1 to LT and GE respectively, and LT, LTU, GE or GEU
 734    comparisons with 256 to 255 and LE, LEU, GT and GTU has been
 735    ineffective; the code path for performing the changes did not trig for
 736    neither the GCC testsuite nor ghostscript-6.52 nor Knuth's mmix.tar.gz
 737    itself (core GCC functionality supposedly handling it) with sources
 738    from 2002-06-06.  */
 739
 740 #define REVERSIBLE_CC_MODE(MODE)                \
 741  mmix_reversible_cc_mode (MODE)
 742
 743
 744 /* Node: Costs */
 745
 746 /* The special registers can only move to and from general regs, and we
 747    need to check that their constraints match, so say 3 for them.  */
 748 /* WARNING: gcc-2.7.2.2 i686-pc-linux-gnulibc1 (as shipped with RH 4.2)
 749    miscompiles reload1.c:reload_cse_simplify_set; a call to
 750    reload_cse_regno_equal_p is missing when checking if a substitution of
 751    a register setting is valid if this is defined to just the expression
 752    in mmix_register_move_cost.
 753
 754    Symptom: a (all?) register setting is optimized away for e.g.
 755    "char *p1(char *p) { return p+1; }" and the value of register zero ($0)
 756    is returned.
 757
 758    We can workaround by making this a function call - unknown if this
 759    causes dire speed effects.  */
 760 #define REGISTER_MOVE_COST(MODE, FROM, TO) \
 761  mmix_register_move_cost (MODE, FROM, TO)
 762
 763 #define SLOW_BYTE_ACCESS 0
 764
 765
 766 /* Node: Sections */
 767
 768 /* This must be a constant string, since it's used in crtstuff.c.  */
 769 #define TEXT_SECTION_ASM_OP \
 770  "\t.text ! mmixal:= 9H LOC 8B"
 771
 772 /* FIXME: Not documented.  */
 773 #define DATA_SECTION_ASM_OP \
 774  mmix_data_section_asm_op ()
 775
 776 #define READONLY_DATA_SECTION_ASM_OP    "\t.section\t.rodata"
 777
 778 /* Node: PIC */
 779 /* (empty) */
 780
 781
 782 /* Node: File Framework */
 783
 784 /* While any other punctuation character but ";" would do, we prefer "%"
 785    or "!"; "!" is an unary operator and so will not be mistakenly included
 786    in correctly formed expressions.  The hash character adds mass; catches
 787    the eye.  We can't have it as a comment char by itself, since it's a
 788    hex-number prefix.  */
 789 #define ASM_COMMENT_START "!#"
 790
 791 /* These aren't currently functional.  We just keep them as markers.  */
 792 #define ASM_APP_ON "%APP\n"
 793 #define ASM_APP_OFF "%NO_APP\n"
 794
 795 #define ASM_OUTPUT_SOURCE_FILENAME(STREAM, NAME) \
 796  mmix_asm_output_source_filename (STREAM, NAME)
 797
 798 #define OUTPUT_QUOTED_STRING(STREAM, STRING) \
 799  mmix_output_quoted_string (STREAM, STRING, strlen (STRING))
 800
 801 #define TARGET_ASM_NAMED_SECTION default_elf_asm_named_section
 802
 803 /* Node: Data Output */
 804
 805 #define ASM_OUTPUT_ASCII(STREAM, PTR, LEN) \
 806  mmix_asm_output_ascii (STREAM, PTR, LEN)
 807
 808 /* Node: Uninitialized Data */
 809
 810 #define ASM_OUTPUT_ALIGNED_COMMON(ST, N, S, A) \
 811  mmix_asm_output_aligned_common (ST, N, S, A)
 812
 813 #define ASM_OUTPUT_ALIGNED_LOCAL(ST, N, S, A) \
 814  mmix_asm_output_aligned_local (ST, N, S, A)
 815
 816
 817 /* Node: Label Output */
 818
 819 #define ASM_OUTPUT_LABEL(STREAM, NAME) \
 820  mmix_asm_output_label (STREAM, NAME)
 821
 822 #define ASM_OUTPUT_INTERNAL_LABEL(STREAM, NAME) \
 823  mmix_asm_output_internal_label (STREAM, NAME)
 824
 825 #define ASM_DECLARE_REGISTER_GLOBAL(STREAM, DECL, REGNO, NAME) \
 826  mmix_asm_declare_register_global (STREAM, DECL, REGNO, NAME)
 827
 828 #define GLOBAL_ASM_OP "\t.global "
 829
 830 #define ASM_WEAKEN_LABEL(STREAM, NAME) \
 831  mmix_asm_weaken_label (STREAM, NAME)
 832
 833 #define MAKE_DECL_ONE_ONLY(DECL) \
 834  mmix_make_decl_one_only (DECL)
 835
 836 #define ASM_OUTPUT_LABELREF(STREAM, NAME) \
 837  mmix_asm_output_labelref (STREAM, NAME)
 838
 839 /* We insert a ":" to disambiguate against user symbols like L5.  */
 840 #define ASM_GENERATE_INTERNAL_LABEL(LABEL, PREFIX, NUM) \
 841  sprintf (LABEL, "*%s:%ld", PREFIX, (long)(NUM))
 842
 843 /* Insert "::"; these are rarer than internal labels.  FIXME: Make sure no
 844    ":" is seen in the object file; we don't really want that mmixal
 845    feature visible there.  We don't want the default, which uses a dot;
 846    that'd be incompatible with mmixal.  */
 847 #define ASM_PN_FORMAT "%s::%lu"
 848
 849 #define ASM_OUTPUT_DEF(STREAM, NAME, VALUE) \
 850  mmix_asm_output_def (STREAM, NAME, VALUE)
 851
 852 /* Node: Macros for Initialization */
 853 /* We're compiling to ELF and linking to MMO; fundamental ELF features
 854    that GCC depend on are there.  */
 855
 856 /* These must be constant strings, since they're used in crtstuff.c.  */
 857 #define INIT_SECTION_ASM_OP "\t.section .init,\"ax\" ! mmixal-incompatible"
 858
 859 #define FINI_SECTION_ASM_OP "\t.section .fini,\"ax\" ! mmixal-incompatible"
 860
 861 #define OBJECT_FORMAT_ELF
 862
 863
 864 /* Node: Instruction Output */
 865
 866 /* The non-$ register names must be prefixed with ":", since they're
 867    affected by PREFIX.  We provide the non-colon names as additional
 868    names.  */
 869 #define REGISTER_NAMES                                                  \
 870  {"$0", "$1", "$2", "$3", "$4", "$5", "$6", "$7",                       \
 871   "$8", "$9", "$10", "$11", "$12", "$13", "$14", "$15",                 \
 872   "$16", "$17", "$18", "$19", "$20", "$21", "$22", "$23",               \
 873   "$24", "$25", "$26", "$27", "$28", "$29", "$30", "$31",               \
 874   "$32", "$33", "$34", "$35", "$36", "$37", "$38", "$39",               \
 875   "$40", "$41", "$42", "$43", "$44", "$45", "$46", "$47",               \
 876   "$48", "$49", "$50", "$51", "$52", "$53", "$54", "$55",               \
 877   "$56", "$57", "$58", "$59", "$60", "$61", "$62", "$63",               \
 878   "$64", "$65", "$66", "$67", "$68", "$69", "$70", "$71",               \
 879   "$72", "$73", "$74", "$75", "$76", "$77", "$78", "$79",               \
 880   "$80", "$81", "$82", "$83", "$84", "$85", "$86", "$87",               \
 881   "$88", "$89", "$90", "$91", "$92", "$93", "$94", "$95",               \
 882   "$96", "$97", "$98", "$99", "$100", "$101", "$102", "$103",           \
 883   "$104", "$105", "$106", "$107", "$108", "$109", "$110", "$111",       \
 884   "$112", "$113", "$114", "$115", "$116", "$117", "$118", "$119",       \
 885   "$120", "$121", "$122", "$123", "$124", "$125", "$126", "$127",       \
 886   "$128", "$129", "$130", "$131", "$132", "$133", "$134", "$135",       \
 887   "$136", "$137", "$138", "$139", "$140", "$141", "$142", "$143",       \
 888   "$144", "$145", "$146", "$147", "$148", "$149", "$150", "$151",       \
 889   "$152", "$153", "$154", "$155", "$156", "$157", "$158", "$159",       \
 890   "$160", "$161", "$162", "$163", "$164", "$165", "$166", "$167",       \
 891   "$168", "$169", "$170", "$171", "$172", "$173", "$174", "$175",       \
 892   "$176", "$177", "$178", "$179", "$180", "$181", "$182", "$183",       \
 893   "$184", "$185", "$186", "$187", "$188", "$189", "$190", "$191",       \
 894   "$192", "$193", "$194", "$195", "$196", "$197", "$198", "$199",       \
 895   "$200", "$201", "$202", "$203", "$204", "$205", "$206", "$207",       \
 896   "$208", "$209", "$210", "$211", "$212", "$213", "$214", "$215",       \
 897   "$216", "$217", "$218", "$219", "$220", "$221", "$222", "$223",       \
 898   "$224", "$225", "$226", "$227", "$228", "$229", "$230", "$231",       \
 899   "$232", "$233", "$234", "$235", "$236", "$237", "$238", "$239",       \
 900   "$240", "$241", "$242", "$243", "$244", "$245", "$246", "$247",       \
 901   "$248", "$249", "$250", "$251", "$252", "$253", "$254", "$255",       \
 902   ":rD",  ":rE",  ":rH",  ":rJ",  ":rR",  "ap_!BAD!", ":rO"}
 903
 904 #define ADDITIONAL_REGISTER_NAMES                       \
 905  {{"sp", 254}, {":sp", 254}, {"rD", 256}, {"rE", 257},  \
 906   {"rH", 258}, {"rJ", MMIX_rJ_REGNUM}, {"rO", MMIX_rO_REGNUM}}
 907
 908 #define PRINT_OPERAND(STREAM, X, CODE) \
 909  mmix_print_operand (STREAM, X, CODE)
 910
 911 #define PRINT_OPERAND_PUNCT_VALID_P(CODE) \
 912  mmix_print_operand_punct_valid_p (CODE)
 913
 914 #define PRINT_OPERAND_ADDRESS(STREAM, X) \
 915  mmix_print_operand_address (STREAM, X)
 916
 917 #define ASM_OUTPUT_REG_PUSH(STREAM, REGNO) \
 918  mmix_asm_output_reg_push (STREAM, REGNO)
 919
 920 #define ASM_OUTPUT_REG_POP(STREAM, REGNO) \
 921  mmix_asm_output_reg_pop (STREAM, REGNO)
 922
 923
 924 /* Node: Dispatch Tables */
 925
 926 /* We define both types, since SImode is the better, but DImode the only
 927    possible for mmixal so that's the one actually used.  */
 928 #define ASM_OUTPUT_ADDR_DIFF_ELT(STREAM, BODY, VALUE, REL) \
 929  mmix_asm_output_addr_diff_elt (STREAM, BODY, VALUE, REL)
 930
 931 #define ASM_OUTPUT_ADDR_VEC_ELT(STREAM, VALUE) \
 932  mmix_asm_output_addr_vec_elt (STREAM, VALUE)
 933
 934
 935 /* Node: Exception Region Output */
 936 /* (empty) */
 937
 938 /* Node: Alignment Output */
 939
 940 #define ASM_OUTPUT_SKIP(STREAM, NBYTES) \
 941  mmix_asm_output_skip (STREAM, NBYTES)
 942
 943 #define ASM_OUTPUT_ALIGN(STREAM, POWER) \
 944  mmix_asm_output_align (STREAM, POWER)
 945
 946
 947 /* Node: All Debuggers */
 948
 949 #define DBX_REGISTER_NUMBER(REGNO) \
 950  mmix_dbx_register_number (REGNO)
 951
 952
 953 /* Node: DBX Options */
 954 /* (empty) */
 955 /* Node: DBX Hooks */
 956 /* (empty) */
 957 /* Node: File Names and DBX */
 958 /* (empty) */
 959
 960
 961 /* Node: SDB and DWARF */
 962 #define DWARF2_DEBUGGING_INFO 1
 963 #define DWARF2_ASM_LINE_DEBUG_INFO 1
 964
 965 /* Node: Misc */
 966
 967 /* There's no way to get a PC-relative offset into tables for SImode, so
 968    for the moment we have absolute entries in DImode.
 969    When we're going ELF, these should be SImode and 1.  */
 970 #define CASE_VECTOR_MODE DImode
 971 #define CASE_VECTOR_PC_RELATIVE 0
 972
 973 #define WORD_REGISTER_OPERATIONS
 974
 975 /* We have a choice, which makes this yet another parameter to tweak.  The
 976    gut feeling is currently that SIGN_EXTEND wins; "int" is more frequent
 977    than "unsigned int", and we have signed characters.  FIXME: measure.  */
 978 #define LOAD_EXTEND_OP(MODE) (TARGET_ZERO_EXTEND ? ZERO_EXTEND : SIGN_EXTEND)
 979
 980 #define MOVE_MAX 8
 981
 982 #define TRULY_NOOP_TRUNCATION(OUTPREC, INPREC) 1
 983
 984 /* ??? MMIX allows a choice of STORE_FLAG_VALUE.  Revisit later,
 985    we don't have scc expanders yet.  */
 986
 987 #define Pmode DImode
 988
 989 #define FUNCTION_MODE QImode
 990
 991 #define NO_IMPLICIT_EXTERN_C
 992
 993 #define HANDLE_SYSV_PRAGMA 1
 994
 995 /* These are checked.  */
 996 #define DOLLARS_IN_IDENTIFIERS 0
 997 #define NO_DOLLAR_IN_LABEL
 998 #define NO_DOT_IN_LABEL
 999
1000 #endif /* GCC_MMIX_H */
1001 /*
1002  * Local variables:
1003  * eval: (c-set-style "gnu")
1004  * indent-tabs-mode: t
1005  * End:
1006  */