gcc/config/mmix/mmix.h

   1 /* Definitions of target machine for GNU compiler, for MMIX.
   2    Copyright (C) 2000, 2001 Free Software Foundation, Inc.
   3    Contributed by Hans-Peter Nilsson (hp@bitrange.com)
   4
   5 This file is part of GNU CC.
   6
   7 GNU CC 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 GNU CC 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 GNU CC; 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 259
  49 #define MMIX_HIMULT_REGNUM 258
  50 #define MMIX_REMAINDER_REGNUM 260
  51 #define MMIX_ARG_POINTER_REGNUM 261
  52 #define MMIX_LAST_REGISTER_FILE_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 struct rtx_def *mmix_compare_op0;
  86 extern struct rtx_def *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
  92  {
  93    int has_call_value_without_parameters;
  94    int has_landing_pad;
  95  };
  96
  97 /* For these target macros, there is no generic documentation here.  You
  98    should read `Using and Porting GCC' for that.  Only comments specific
  99    to the MMIX target are here.
 100
 101    There are however references to the specific texinfo node (comments
 102    with "Node:"), so there should be little or nothing amiss.  Probably
 103    the opposite, since we don't have to care about old littering and
 104    soon outdated generic comments.  */
 105
 106 /* Node: Driver */
 107
 108 /* When both ABI:s work, this is how we tell them apart in code.  The
 109    GNU abi is implied the default.  Also implied in TARGET_DEFAULT.  */
 110 #define CPP_SPEC \
 111  "%{mabi=gnu:-D__MMIX_ABI_GNU__\
 112     %{mabi=mmixware:\
 113       %eoptions -mabi=mmixware and -mabi=gnu are mutually exclusive}}\
 114   %{!mabi=gnu:-D__MMIX_ABI_MMIXWARE__}"
 115
 116 /* User symbols are in the same name-space as built-in symbols, but we
 117    don't need the built-in symbols, so remove those and instead apply
 118    stricter operand checking.  Don't warn when expanding insns.  */
 119 #define ASM_SPEC "-no-predefined-syms -x"
 120
 121 /* Pass on -mset-program-start=N and -mset-data-start=M to the linker.
 122    Provide default program start 0x100 unless -mno-set-program-start.
 123    Link to ELF if requested.  */
 124 #define LINK_SPEC \
 125  "%{mset-program-start=*:--defsym __.MMIX.start..text=%*}\
 126   %{mset-data-start=*:--defsym __.MMIX.start..data=%*}\
 127   %{!mset-program-start=*:\
 128     %{!mno-set-program-start:--defsym __.MMIX.start..text=0x100}}\
 129   %{!melf:-m mmo}%{melf:-m elf64mmix}"
 130
 131 /* Put unused option values here.  */
 132 extern const char *mmix_cc1_ignored_option;
 133
 134 #define TARGET_OPTIONS                                  \
 135    {{"set-program-start=", &mmix_cc1_ignored_option,    \
 136   N_("Set start-address of the program") },             \
 137     {"set-data-start=", &mmix_cc1_ignored_option,       \
 138   N_("Set start-address of data")}}
 139
 140 /* FIXME: There's no provision for profiling here.  */
 141 #define STARTFILE_SPEC  \
 142   "crti%O%s crtbegin%O%s"
 143
 144 #define ENDFILE_SPEC "crtend%O%s crtn%O%s"
 145
 146 /* Node: Run-time Target */
 147
 148 /* Define __LONG_MAX__, since we're advised not to change glimits.h.  */
 149 #define CPP_PREDEFINES "-D__mmix__ -D__MMIX__ -D__LONG_MAX__=9223372036854775807L"
 150
 151 extern int target_flags;
 152
 153 #define TARGET_MASK_LIBFUNCS 1
 154 #define TARGET_MASK_ABI_GNU 2
 155 #define TARGET_MASK_FCMP_EPSILON 4
 156 #define TARGET_MASK_ZERO_EXTEND 8
 157 #define TARGET_MASK_KNUTH_DIVISION 16
 158 #define TARGET_MASK_TOPLEVEL_SYMBOLS 32
 159
 160 /* FIXME: Get rid of this one.  */
 161 #define TARGET_LIBFUNC (target_flags & TARGET_MASK_LIBFUNCS)
 162 #define TARGET_ABI_GNU (target_flags & TARGET_MASK_ABI_GNU)
 163 #define TARGET_FCMP_EPSILON (target_flags & TARGET_MASK_FCMP_EPSILON)
 164 #define TARGET_ZERO_EXTEND (target_flags & TARGET_MASK_ZERO_EXTEND)
 165 #define TARGET_KNUTH_DIVISION (target_flags & TARGET_MASK_KNUTH_DIVISION)
 166 #define TARGET_TOPLEVEL_SYMBOLS (target_flags & TARGET_MASK_TOPLEVEL_SYMBOLS)
 167
 168 #define TARGET_DEFAULT 0
 169
 170 /* FIXME: Provide a way to *load* the epsilon register.
 171    Kill some of these; preferrably the -mint=* ones.  */
 172 #define TARGET_SWITCHES                                                 \
 173  {{"libfuncs",          TARGET_MASK_LIBFUNCS,                           \
 174    N_("For intrinsics library: pass all parameters in registers")},     \
 175   {"no-libfuncs",       -TARGET_MASK_LIBFUNCS, ""},                     \
 176   {"abi=mmixware",      -TARGET_MASK_ABI_GNU,                           \
 177    N_("Use register stack for parameters and return value")},           \
 178   {"abi=gnu",           TARGET_MASK_ABI_GNU,                            \
 179    N_("Use call-clobbered registers for parameters and return value")}, \
 180   {"epsilon",           TARGET_MASK_FCMP_EPSILON,                       \
 181    N_("Use epsilon-respecting floating point compare instructions")},   \
 182   {"no-epsilon",        -TARGET_MASK_FCMP_EPSILON, ""},                 \
 183   {"zero-extend",       TARGET_MASK_ZERO_EXTEND,                        \
 184    N_("Use zero-extending memory loads, not sign-extending ones")},     \
 185   {"no-zero-extend",    -TARGET_MASK_ZERO_EXTEND,  ""},                 \
 186   {"knuthdiv",          TARGET_MASK_KNUTH_DIVISION,                     \
 187    N_("Generate divide results with reminder having the same sign as the\
 188  divisor (not the dividend)")},                                         \
 189   {"no-knuthdiv",       -TARGET_MASK_KNUTH_DIVISION, ""},               \
 190   {"toplevel-symbols",  TARGET_MASK_TOPLEVEL_SYMBOLS,                   \
 191    N_("Prepend global symbols with \":\" (for use with PREFIX)")},      \
 192   {"no-toplevel-symbols", 0,                                            \
 193    N_("Do not provide a default start-address 0x100 of the program")},  \
 194   {"elf", 0,                                                            \
 195    N_("Link to emit program in ELF format (rather than mmo)")},         \
 196   {"",                  TARGET_DEFAULT, ""}}
 197
 198 /* Unfortunately, this must not reference anything in "mmix.c".  */
 199 #define TARGET_VERSION \
 200   fprintf (stderr, " (MMIX) 2001-09-01")
 201
 202 #define OVERRIDE_OPTIONS mmix_override_options ()
 203
 204 #define OPTIMIZATION_OPTIONS(LEVEL, SIZE)       \
 205   do                                            \
 206     {                                           \
 207       if (LEVEL >= 1)                           \
 208         flag_regmove = TRUE;                    \
 209                                                 \
 210       if (SIZE || LEVEL > 1)                    \
 211         {                                       \
 212           flag_omit_frame_pointer = TRUE;       \
 213           flag_strength_reduce = FALSE;         \
 214         }                                       \
 215     }                                           \
 216   while (0)
 217
 218 /* This one will have to wait a little bit; right now we can't debug
 219    neither with or without a frame-pointer.  */
 220 /* #define CAN_DEBUG_WITHOUT_FP */
 221
 222
 223 /* Node: Per-Function Data */
 224 #define INIT_EXPANDERS mmix_init_expanders ()
 225
 226
 227 /* Node: Storage Layout */
 228 /* I see no bitfield instructions.  Anyway, the common order is from low
 229    to high, as the power of two, hence little-endian.  */
 230 #define BITS_BIG_ENDIAN 0
 231 #define BYTES_BIG_ENDIAN 1
 232 #define WORDS_BIG_ENDIAN 1
 233 #define FLOAT_WORDS_BIG_ENDIAN 1
 234 #define BITS_PER_UNIT 8
 235 #define BITS_PER_WORD 64
 236 #define UNITS_PER_WORD 8
 237 #define POINTER_SIZE 64
 238
 239 /* FIXME: This macro is correlated to MAX_FIXED_MODE_SIZE in that
 240    e.g. this macro must not be 8 (default, UNITS_PER_WORD) when
 241    MAX_FIXED_MODE_SIZE is 64 (default, DImode), or really: this must be
 242    set manually if MAX_FIXED_MODE_SIZE is not at least twice the register
 243    size.  By setting it to 4, we don't have to worry about TImode things
 244    yet.  Revisit, perhaps get TImode going or get some solution that does
 245    not mandate TImode or lie in other ways.  */
 246 #define MIN_UNITS_PER_WORD 4
 247
 248 /* FIXME: Promotion of modes currently generates slow code, extending
 249    before every operation.  */
 250
 251 #define PROMOTE_MODE(MODE, UNSIGNEDP, TYPE)     \
 252  do {                                           \
 253   if (GET_MODE_CLASS (MODE) == MODE_INT         \
 254       && GET_MODE_SIZE (MODE) < 8)              \
 255    {                                            \
 256      (MODE) = DImode;                           \
 257      /* Do the following some time later,       \
 258         scrutinizing differences.  */           \
 259      if (0) (UNSIGNEDP) = 0;                    \
 260    }                                            \
 261  } while (0)
 262
 263 #define PROMOTE_FUNCTION_ARGS
 264
 265 #if 0
 266 /* Apparently not doing TRT if int < register-size.  FIXME: Perhaps
 267    FUNCTION_VALUE and LIBCALL_VALUE needs tweaking as some ports say.  */
 268 #define PROMOTE_FUNCTION_RETURN
 269 #endif
 270
 271 /* I'm a little bit undecided about this one.  It might be beneficial to
 272    promote all operations.  */
 273 #define PROMOTE_FOR_CALL_ONLY
 274
 275 /* We need to align everything to 64 bits that can affect the alignment
 276    of other types.  Since address N is interpreted in MMIX as (N modulo
 277    access_size), we must align.  */
 278 #define PARM_BOUNDARY 64
 279 #define STACK_BOUNDARY 64
 280 #define FUNCTION_BOUNDARY 32
 281 #define BIGGEST_ALIGNMENT 64
 282
 283 /* This one is only used in the ADA front end.  */
 284 #define MINIMUM_ATOMIC_ALIGNMENT 8
 285
 286 /* Copied from elfos.h.  */
 287 #define MAX_OFILE_ALIGNMENT (32768 * 8)
 288
 289 #define DATA_ALIGNMENT(TYPE, BASIC_ALIGN) \
 290  mmix_data_alignment (TYPE, BASIC_ALIGN)
 291
 292 #define CONSTANT_ALIGNMENT(CONSTANT, BASIC_ALIGN) \
 293  mmix_constant_alignment (CONSTANT, BASIC_ALIGN)
 294
 295 #define LOCAL_ALIGNMENT(TYPE, BASIC_ALIGN) \
 296  mmix_local_alignment (TYPE, BASIC_ALIGN)
 297
 298 /* Following other ports, this seems to most commonly be the word-size,
 299    so let's do that here too.  */
 300 #define EMPTY_FIELD_BOUNDARY 64
 301
 302 /* We chose to have this low solely for similarity with the alpha.  It has
 303    nothing to do with passing the tests dg/c99-scope-2 and
 304    execute/align-1.c.  Nothing.  Though the tests seem wrong.  Padding of
 305    the structure is automatically added to get alignment when needed if we
 306    set this to just byte-boundary.  */
 307 #define STRUCTURE_SIZE_BOUNDARY 8
 308
 309 /* The lower bits are ignored.  */
 310 #define STRICT_ALIGNMENT 1
 311
 312
 313 /* Node: Type Layout */
 314
 315 /* It might seem more natural to have 64-bit ints on a 64-bit machine,
 316    but then an occasional MMIX programmer needs to know how to put a lot
 317    of __attribute__ stuff to get to the 8, 16 and 32-bit modes rather
 318    than the "intuitive" char, short and int types.  */
 319 #define INT_TYPE_SIZE 32
 320 #define SHORT_TYPE_SIZE 16
 321 #define LONG_LONG_TYPE_SIZE 64
 322
 323 #define FLOAT_TYPE_SIZE 32
 324 #define DOUBLE_TYPE_SIZE 64
 325 #define LONG_DOUBLE_TYPE_SIZE 64
 326
 327 #define DEFAULT_SIGNED_CHAR 1
 328
 329 /* I have no rationale for this other than pointing at Alpha.  */
 330 #define WCHAR_TYPE "unsigned int"
 331 #define WCHAR_TYPE_SIZE 32
 332
 333
 334 /* Node: Register Basics */
 335 /* We tell GCC about all 256 general registers, and we also include
 336    rD, rE, rH, rJ and rR (in that order) so we can describe what insns
 337    clobber them.  We use a faked register for the argument pointer.  It is
 338    always eliminated towards the frame-pointer or the stack-pointer, never
 339    output in assembly.  Any fixed register would do for this, like $255,
 340    but future debugging is easier when using a separate register.  It
 341    counts as a global register for pseudorandom reasons.  */
 342 #define FIRST_PSEUDO_REGISTER 262
 343
 344 /* We treat general registers with no assigned purpose as fixed.  The
 345    stack pointer, $254, is also fixed.  Register $255 is referred to as a
 346    temporary register in the MMIX papers, and used as such in mmixal, so
 347    it should not be used as a stack pointer.  We set it to fixed, and use
 348    it "manually" at times of despair.  */
 349 #define FIXED_REGISTERS \
 350  { 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, \
 351    0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, \
 352    1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, \
 353    1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, \
 354    1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, \
 355    1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, \
 356    1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, \
 357    1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, \
 358    1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, \
 359    1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, \
 360    1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, \
 361    1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, \
 362    1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, \
 363    1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, \
 364    1, 1, 1, 1, 1, 1, 1, 0, 0, 0, 0, 0, 0, 0, 0, 0, \
 365    0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 1, 1, \
 366    1, 1, 0, 0, 0, 1 \
 367  }
 368
 369 /* General registers are fixed and therefore "historically" marked
 370    call-used.  (FIXME: This has changed).  Registers $15..$31 are
 371    call-clobbered; we'll put arguments in $16 and up, and we need $15 for
 372    the MMIX register-stack "hole".  */
 373 #define CALL_USED_REGISTERS \
 374  { 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 1, \
 375    1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, \
 376    1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, \
 377    1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, \
 378    1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, \
 379    1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, \
 380    1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, \
 381    1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, \
 382    1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, \
 383    1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, \
 384    1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, \
 385    1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, \
 386    1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, \
 387    1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, \
 388    1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, \
 389    1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 0, 1, 1, \
 390    1, 1, 1, 1, 1, 1 \
 391  }
 392
 393 #define CONDITIONAL_REGISTER_USAGE mmix_conditional_register_usage ()
 394
 395 /* No LOCAL_REGNO, INCOMING_REGNO or OUTGOING_REGNO, since those macros
 396    are not usable for MMIX: it doesn't have a fixed register window size.
 397    FIXME: Perhaps we should say something about $0..$15 may sometimes be
 398    the incoming $16..$31.  Those macros need better documentation; it
 399    looks like they're just bogus and that FUNCTION_INCOMING_ARG_REGNO_P
 400    and FUNCTION_OUTGOING_VALUE should be used where they're used.  For the
 401    moment, do nothing; things seem to work anyway.  */
 402
 403
 404 /* Node: Allocation Order */
 405
 406 /* We should allocate registers from 0 to 31 by increasing number, because
 407    I think that's what people expect.  Beyond that, just use
 408    call-clobbered global registers first, then call-clobbered special
 409    registers.  Last, the fixed registers.  */
 410 #define MMIX_MMIXWARE_ABI_REG_ALLOC_ORDER       \
 411  { 0, 1, 2, 3, 4, 5, 6, 7,                      \
 412    8, 9, 10, 11, 12, 13, 14, 15,                \
 413    16, 17, 18, 19, 20, 21, 22, 23,              \
 414    24, 25, 26, 27, 28, 29, 30, 31,              \
 415                                                 \
 416    252, 251, 250, 249, 248, 247,                \
 417    246, 245, 244, 243, 242, 241, 240, 239,      \
 418    238, 237, 236, 235, 234, 233, 232, 231,      \
 419                                                 \
 420    253,                                         \
 421                                                 \
 422    258, 260, 259,                               \
 423                                                 \
 424    32, 33, 34, 35, 36, 37, 38, 39,              \
 425    40, 41, 42, 43, 44, 45, 46, 47,              \
 426    48, 49, 50, 51, 52, 53, 54, 55,              \
 427    56, 57, 58, 59, 60, 61, 62, 63,              \
 428    64, 65, 66, 67, 68, 69, 70, 71,              \
 429    72, 73, 74, 75, 76, 77, 78, 79,              \
 430    80, 81, 82, 83, 84, 85, 86, 87,              \
 431    88, 89, 90, 91, 92, 93, 94, 95,              \
 432    96, 97, 98, 99, 100, 101, 102, 103,          \
 433    104, 105, 106, 107, 108, 109, 110, 111,      \
 434    112, 113, 114, 115, 116, 117, 118, 119,      \
 435    120, 121, 122, 123, 124, 125, 126, 127,      \
 436    128, 129, 130, 131, 132, 133, 134, 135,      \
 437    136, 137, 138, 139, 140, 141, 142, 143,      \
 438    144, 145, 146, 147, 148, 149, 150, 151,      \
 439    152, 153, 154, 155, 156, 157, 158, 159,      \
 440    160, 161, 162, 163, 164, 165, 166, 167,      \
 441    168, 169, 170, 171, 172, 173, 174, 175,      \
 442    176, 177, 178, 179, 180, 181, 182, 183,      \
 443    184, 185, 186, 187, 188, 189, 190, 191,      \
 444    192, 193, 194, 195, 196, 197, 198, 199,      \
 445    200, 201, 202, 203, 204, 205, 206, 207,      \
 446    208, 209, 210, 211, 212, 213, 214, 215,      \
 447    216, 217, 218, 219, 220, 221, 222, 223,      \
 448    224, 225, 226, 227, 228, 229, 230, 231,      \
 449    254, 255, 256, 257, 261                      \
 450  }
 451
 452 /* As a convenience, we put this nearby, for ease of comparison.
 453    First, call-clobbered registers in reverse order of assignment as
 454    parameters (also the top ones; not because they're parameters, but
 455    for continuity).
 456
 457    Second, saved registers that go on the register-stack.
 458
 459    Third, special registers rH, rR and rJ.  They should not normally be
 460    allocated, but since they're call-clobbered, it is cheaper to use one
 461    of them than using a call-saved register for a call-clobbered use,
 462    assuming it is referenced a very limited number of times.  Other global
 463    and fixed registers come next; they are never allocated.  */
 464 #define MMIX_GNU_ABI_REG_ALLOC_ORDER            \
 465 {  252, 251, 250, 249, 248, 247, 246,           \
 466    245, 244, 243, 242, 241, 240, 239, 238,      \
 467    237, 236, 235, 234, 233, 232,                \
 468                                                 \
 469    0, 1, 2, 3, 4, 5, 6, 7,                      \
 470    8, 9, 10, 11, 12, 13, 14, 15,                \
 471    16, 17, 18, 19, 20, 21, 22, 23,              \
 472    24, 25, 26, 27, 28, 29, 30, 31,              \
 473                                                 \
 474    253,                                         \
 475                                                 \
 476    258, 260, 259,                               \
 477                                                 \
 478    32, 33, 34, 35, 36, 37, 38, 39,              \
 479    40, 41, 42, 43, 44, 45, 46, 47,              \
 480    48, 49, 50, 51, 52, 53, 54, 55,              \
 481    56, 57, 58, 59, 60, 61, 62, 63,              \
 482    64, 65, 66, 67, 68, 69, 70, 71,              \
 483    72, 73, 74, 75, 76, 77, 78, 79,              \
 484    80, 81, 82, 83, 84, 85, 86, 87,              \
 485    88, 89, 90, 91, 92, 93, 94, 95,              \
 486    96, 97, 98, 99, 100, 101, 102, 103,          \
 487    104, 105, 106, 107, 108, 109, 110, 111,      \
 488    112, 113, 114, 115, 116, 117, 118, 119,      \
 489    120, 121, 122, 123, 124, 125, 126, 127,      \
 490    128, 129, 130, 131, 132, 133, 134, 135,      \
 491    136, 137, 138, 139, 140, 141, 142, 143,      \
 492    144, 145, 146, 147, 148, 149, 150, 151,      \
 493    152, 153, 154, 155, 156, 157, 158, 159,      \
 494    160, 161, 162, 163, 164, 165, 166, 167,      \
 495    168, 169, 170, 171, 172, 173, 174, 175,      \
 496    176, 177, 178, 179, 180, 181, 182, 183,      \
 497    184, 185, 186, 187, 188, 189, 190, 191,      \
 498    192, 193, 194, 195, 196, 197, 198, 199,      \
 499    200, 201, 202, 203, 204, 205, 206, 207,      \
 500    208, 209, 210, 211, 212, 213, 214, 215,      \
 501    216, 217, 218, 219, 220, 221, 222, 223,      \
 502    224, 225, 226, 227, 228, 229, 230, 231,      \
 503    254, 255, 256, 257, 261                      \
 504  }
 505
 506 /* The default one.  */
 507 #define REG_ALLOC_ORDER MMIX_MMIXWARE_ABI_REG_ALLOC_ORDER
 508
 509 /* Node: Values in Registers */
 510
 511 #define HARD_REGNO_NREGS(REGNO, MODE)                   \
 512    ((GET_MODE_SIZE (MODE) + UNITS_PER_WORD - 1)         \
 513     / UNITS_PER_WORD)
 514
 515 #define HARD_REGNO_MODE_OK(REGNO, MODE) 1
 516
 517 /* Note that no register can really be accessed in single-float mode, so
 518    we *can* say 1 here.  FIXME:  Will TRT happen for single-float, or do
 519    we have to punt to libgcc1.asm?  */
 520 #define MODES_TIEABLE_P(MODE1, MODE2) 1
 521
 522
 523 /* Node: Leaf Functions */
 524 /* (empty) */
 525
 526
 527 /* Node: Register Classes */
 528
 529 enum reg_class
 530 {
 531   NO_REGS, GENERAL_REGS, REMAINDER_REG, HIMULT_REG,
 532   SYSTEM_REGS, ALL_REGS, LIM_REG_CLASSES
 533 };
 534
 535 #define N_REG_CLASSES (int) LIM_REG_CLASSES
 536
 537 #define REG_CLASS_NAMES                                         \
 538  {"NO_REGS", "GENERAL_REGS", "REMAINDER_REG", "HIMULT_REG",     \
 539   "SYSTEM_REGS", "ALL_REGS"}
 540
 541 /* Note that the contents of each item is always 32 bits.  */
 542 #define REG_CLASS_CONTENTS                      \
 543  {{0, 0, 0, 0, 0, 0, 0, 0, 0},                  \
 544   {~0, ~0, ~0, ~0, ~0, ~0, ~0, ~0, 0x20},       \
 545   {0, 0, 0, 0, 0, 0, 0, 0, 0x10},               \
 546   {0, 0, 0, 0, 0, 0, 0, 0, 4},                  \
 547   {0, 0, 0, 0, 0, 0, 0, 0, 0x3f},               \
 548   {~0, ~0, ~0, ~0, ~0, ~0, ~0, ~0, 0x3f}}
 549
 550 #define REGNO_REG_CLASS(REGNO)                                  \
 551  ((REGNO) <= MMIX_LAST_GENERAL_REGISTER                         \
 552   || (REGNO) == MMIX_ARG_POINTER_REGNUM                         \
 553   ? GENERAL_REGS                                                \
 554   : (REGNO) == MMIX_REMAINDER_REGNUM ? REMAINDER_REG            \
 555   : (REGNO) == MMIX_HIMULT_REGNUM ? HIMULT_REG : SYSTEM_REGS)
 556
 557 #define BASE_REG_CLASS GENERAL_REGS
 558
 559 #define INDEX_REG_CLASS GENERAL_REGS
 560
 561 #define REG_CLASS_FROM_LETTER(CHAR)             \
 562  ((CHAR) == 'x' ? SYSTEM_REGS                   \
 563   : (CHAR) == 'y' ? REMAINDER_REG               \
 564   : (CHAR) == 'z' ? HIMULT_REG : NO_REGS)
 565
 566 #define REGNO_OK_FOR_BASE_P(REGNO)                              \
 567  ((REGNO) <= MMIX_LAST_GENERAL_REGISTER                         \
 568   || (REGNO) == MMIX_ARG_POINTER_REGNUM                         \
 569   || (reg_renumber[REGNO] > 0                                   \
 570       && reg_renumber[REGNO] <= MMIX_LAST_GENERAL_REGISTER))
 571
 572 #define REGNO_OK_FOR_INDEX_P(REGNO) REGNO_OK_FOR_BASE_P (REGNO)
 573
 574 #define PREFERRED_RELOAD_CLASS(X, CLASS) \
 575  mmix_preferred_reload_class (X, CLASS)
 576
 577 #define PREFERRED_OUTPUT_RELOAD_CLASS(X, CLASS) \
 578  mmix_preferred_output_reload_class (X, CLASS)
 579
 580 #define SECONDARY_INPUT_RELOAD_CLASS(CLASS, MODE, X) \
 581  mmix_secondary_reload_class (CLASS, MODE, X, 1)
 582
 583 #define SECONDARY_OUTPUT_RELOAD_CLASS(CLASS, MODE, X) \
 584  mmix_secondary_reload_class (CLASS, MODE, X, 0)
 585
 586 #define CLASS_MAX_NREGS(CLASS, MODE) HARD_REGNO_NREGS (CLASS, MODE)
 587
 588 #define CONST_OK_FOR_LETTER_P(VALUE, C) \
 589  mmix_const_ok_for_letter_p (VALUE, C)
 590
 591 #define EXTRA_CONSTRAINT(VALUE, C)      \
 592  mmix_extra_constraint (VALUE, C)
 593
 594 /* Do we need anything serious here?  Yes, any FLOT constant.  */
 595 #define CONST_DOUBLE_OK_FOR_LETTER_P(VALUE, C)                  \
 596  mmix_const_double_ok_for_letter_p (VALUE, C)
 597
 598
 599 /* Node: Frame Layout */
 600
 601 #define STACK_GROWS_DOWNWARD
 602 #define FRAME_GROWS_DOWNWARD
 603
 604 #define STARTING_FRAME_OFFSET \
 605   mmix_starting_frame_offset ()
 606
 607 /* There is a stack slot between the frame-pointer and the first
 608    parameter, where the return address is sometimes stored.  FIXME:
 609    Unnecessary.  */
 610 #define FIRST_PARM_OFFSET(FUNDECL) 8
 611
 612 #define DYNAMIC_CHAIN_ADDRESS(FRAMEADDR) \
 613  mmix_dynamic_chain_address (FRAMEADDR)
 614
 615 /* FIXME: It seems RETURN_ADDR_OFFSET is undocumented.  */
 616
 617 #define SETUP_FRAME_ADDRESSES() \
 618  mmix_setup_frame_addresses ()
 619
 620 #define RETURN_ADDR_RTX(COUNT, FRAME)           \
 621  mmix_return_addr_rtx (COUNT, FRAME)
 622
 623 /* It's in rJ before we store it somewhere.  */
 624 #define INCOMING_RETURN_ADDR_RTX \
 625  gen_rtx_REG (Pmode, MMIX_INCOMING_RETURN_ADDRESS_REGNUM)
 626
 627 /* FIXME: This does not seem properly documented or cross-indexed.
 628    Nowhere except in the code does it say it *has* to be in the range
 629    0..255, or else it will be truncated.  That goes for the default too.  */
 630 #define DWARF_FRAME_RETURN_COLUMN \
 631  DWARF_FRAME_REGNUM (MMIX_INCOMING_RETURN_ADDRESS_REGNUM)
 632
 633 /* No return address is stored there.  */
 634 #define INCOMING_FRAME_SP_OFFSET 0
 635
 636 /* Node: Stack Checking */
 637 /* (empty) */
 638
 639
 640 /* Node: Exception Handling */
 641
 642 #define EH_RETURN_DATA_REGNO(N) \
 643  mmix_eh_return_data_regno (N)
 644
 645 #define EH_RETURN_STACKADJ_RTX \
 646  mmix_eh_return_stackadj_rtx ()
 647
 648 #define EH_RETURN_HANDLER_RTX \
 649  mmix_eh_return_handler_rtx ()
 650
 651 #define ASM_PREFERRED_EH_DATA_FORMAT(CODE, GLOBAL) \
 652  mmix_asm_preferred_eh_data_format (CODE, GLOBAL)
 653
 654 /* Node: Frame Registers */
 655 #define STACK_POINTER_REGNUM MMIX_STACK_POINTER_REGNUM
 656
 657 /* Perhaps we can use HARD_FRAME_POINTER_REGNUM and decide later on
 658    what register we want to use.  */
 659 #define FRAME_POINTER_REGNUM MMIX_FRAME_POINTER_REGNUM
 660 #define ARG_POINTER_REGNUM MMIX_ARG_POINTER_REGNUM
 661
 662 #define STATIC_CHAIN_REGNUM MMIX_STATIC_CHAIN_REGNUM
 663
 664
 665 /* Node: Elimination */
 666 /* FIXME: Is this requirement built-in?  Anyway, we should try to get rid
 667    of it; we can deduce the value.  */
 668 #define FRAME_POINTER_REQUIRED (nonlocal_goto_stack_level != NULL_RTX)
 669
 670 /* The frame-pointer is stored in a location that either counts to the
 671    offset of incoming parameters, or that counts to the offset of the
 672    frame, so we can't use a single offset.  We therefore eliminate those
 673    two separately.  */
 674 #define ELIMINABLE_REGS                         \
 675  {{ARG_POINTER_REGNUM, STACK_POINTER_REGNUM},   \
 676   {ARG_POINTER_REGNUM, FRAME_POINTER_REGNUM},   \
 677   {FRAME_POINTER_REGNUM, STACK_POINTER_REGNUM}}
 678
 679 /* We need not worry about when the frame-pointer is required for other
 680    reasons; GCC takes care of those cases.  */
 681 #define CAN_ELIMINATE(FROM, TO) 1
 682
 683 #define INITIAL_ELIMINATION_OFFSET(FROM, TO, OFFSET) \
 684  (OFFSET) = mmix_initial_elimination_offset (FROM, TO);
 685
 686
 687 /* Node: Stack Arguments */
 688
 689 #define ACCUMULATE_OUTGOING_ARGS 1
 690
 691 #define RETURN_POPS_ARGS(FUNDECL, FUNTYPE, STACKSIZE) 0
 692
 693
 694 /* Node: Register Arguments */
 695 #define FUNCTION_ARG(CUM, MODE, TYPE, NAMED)    \
 696  mmix_function_arg (&(CUM), MODE, TYPE, NAMED, 0)
 697
 698 #define FUNCTION_INCOMING_ARG(CUM, MODE, TYPE, NAMED)   \
 699  mmix_function_arg (&(CUM), MODE, TYPE, NAMED, 1)
 700
 701 #define FUNCTION_ARG_PASS_BY_REFERENCE(CUM, MODE, TYPE, NAMED)  \
 702  mmix_function_arg_pass_by_reference (&(CUM), MODE, TYPE, NAMED)
 703
 704 /* This *sounds* good, but does not seem to be implemented correctly to
 705    be a win; at least it wasn't in 2.7.2.  FIXME: Check and perhaps
 706    replace with a big comment.  */
 707 #define FUNCTION_ARG_CALLEE_COPIES(CUM, MODE, TYPE, NAMED) 1
 708
 709 typedef struct { int regs; int lib; int now_varargs; } CUMULATIVE_ARGS;
 710
 711 #define INIT_CUMULATIVE_ARGS(CUM, FNTYPE, LIBNAME, INDIRECT)    \
 712  ((CUM).regs = 0, (CUM).lib = ((LIBNAME) != 0), (CUM).now_varargs = 0)
 713
 714 #define FUNCTION_ARG_ADVANCE(CUM, MODE, TYPE, NAMED)            \
 715  ((CUM).regs                                                    \
 716   = ((MUST_PASS_IN_STACK (MODE, TYPE))                          \
 717      || (MMIX_FUNCTION_ARG_SIZE (MODE, TYPE) > 8                \
 718          && !TARGET_LIBFUNC && !(CUM).lib))                     \
 719   ? (MMIX_MAX_ARGS_IN_REGS) + 1                                 \
 720   : (CUM).regs + (7 + (MMIX_FUNCTION_ARG_SIZE (MODE, TYPE))) / 8)
 721
 722 #define FUNCTION_ARG_REGNO_P(REGNO)             \
 723  mmix_function_arg_regno_p (REGNO, 0)
 724
 725 #define FUNCTION_INCOMING_ARG_REGNO_P(REGNO)            \
 726  mmix_function_arg_regno_p (REGNO, 1)
 727
 728
 729 /* Node: Register Arguments */
 730
 731 #define FUNCTION_VALUE(VALTYPE, FUNC)  \
 732  gen_rtx_REG (TYPE_MODE (VALTYPE), MMIX_RETURN_VALUE_REGNUM)
 733
 734 /* This needs to take care of the register hole for complex return values.  */
 735 #define FUNCTION_OUTGOING_VALUE(VALTYPE, FUNC)  \
 736  mmix_function_outgoing_value (VALTYPE, FUNC)
 737
 738 #define LIBCALL_VALUE(MODE) \
 739  gen_rtx_REG (MODE, MMIX_OUTGOING_RETURN_VALUE_REGNUM)
 740
 741 #define FUNCTION_VALUE_REGNO_P(REGNO) \
 742  ((REGNO) == MMIX_OUTGOING_RETURN_VALUE_REGNUM)
 743
 744
 745 /* Node: Aggregate Return */
 746
 747 #define STRUCT_VALUE_REGNUM MMIX_STRUCT_VALUE_REGNUM
 748
 749
 750 /* Node: Caller Saves */
 751 /* (empty) */
 752
 753
 754 /* Node: Function Entry */
 755
 756 /* See mmix.c for TARGET_ASM_FUNCTION_PROLOGUE and
 757    TARGET_ASM_FUNCTION_EPILOGUE.  */
 758
 759 /* We need to say that the epilogue uses the return address, so the
 760    initial-value machinery restores it.  FIXME: Some targets
 761    conditionalize on "reload_completed &&".  Investigate difference.
 762    FIXME: Not needed if nonlocal_goto_stack_level.  */
 763 #define EPILOGUE_USES(REGNO) \
 764  ((REGNO) == MMIX_INCOMING_RETURN_ADDRESS_REGNUM)
 765
 766 #define ASM_OUTPUT_MI_THUNK(FILE, THUNK_FNDECL, DELTA, FUNCTION)        \
 767  mmix_asm_output_mi_thunk (FILE, THUNK_FNDECL, DELTA, FUNCTION)
 768
 769
 770 /* Node: Profiling */
 771 #define FUNCTION_PROFILER(FILE, LABELNO)        \
 772  mmix_function_profiler (FILE, LABELNO)
 773
 774 /* Node: Varargs */
 775
 776 /* For the moment, let's stick to pushing argument registers on the stack.
 777    Later, we can parse all arguments in registers, to improve
 778    performance.  */
 779 #define SETUP_INCOMING_VARARGS(A, M, T, P, S)   \
 780  mmix_setup_incoming_varargs(&(A), M, T, &(P), S)
 781
 782 /* FIXME: This and other EXPAND_BUILTIN_VA_... target macros are not
 783    documented, although used by several targets.  */
 784 #define EXPAND_BUILTIN_VA_ARG(VALIST, TYPE) \
 785  mmix_expand_builtin_va_arg (VALIST, TYPE)
 786
 787 /* Node: Trampolines */
 788
 789 #define TRAMPOLINE_TEMPLATE(FILE) \
 790  mmix_trampoline_template (FILE)
 791
 792 #define TRAMPOLINE_SIZE mmix_trampoline_size
 793 #define INITIALIZE_TRAMPOLINE(ADDR, FNADDR, STATIC_CHAIN) \
 794  mmix_initialize_trampoline (ADDR, FNADDR, STATIC_CHAIN)
 795
 796
 797 /* Node: Library Calls */
 798
 799 #define TARGET_MEM_FUNCTIONS
 800
 801
 802 /* Node: Addressing Modes */
 803
 804 #define CONSTANT_ADDRESS_P(X) \
 805  mmix_constant_address_p (X)
 806
 807 #define MAX_REGS_PER_ADDRESS 2
 808
 809 #define GO_IF_LEGITIMATE_ADDRESS(MODE, X, LABEL)                \
 810  if (mmix_legitimate_address (MODE, X, MMIX_REG_OK_STRICT))     \
 811    goto LABEL
 812
 813 #ifndef REG_OK_STRICT
 814 # define REG_OK_FOR_BASE_P(X)                   \
 815   (REGNO (X) <= MMIX_LAST_GENERAL_REGISTER      \
 816    || REGNO (X) == MMIX_ARG_POINTER_REGNUM      \
 817    || REGNO (X) >= FIRST_PSEUDO_REGISTER)
 818 #else
 819 # define REG_OK_FOR_BASE_P(X) REGNO_OK_FOR_BASE_P (REGNO (X))
 820 #endif /* REG_OK_STRICT */
 821
 822 #define REG_OK_FOR_INDEX_P(X) REG_OK_FOR_BASE_P (X)
 823
 824 #define LEGITIMIZE_ADDRESS(X, OLDX, MODE, WIN)
 825
 826 #define GO_IF_MODE_DEPENDENT_ADDRESS(ADDR, LABEL)
 827
 828 #define LEGITIMATE_CONSTANT_P(X) \
 829  mmix_legitimate_constant_p (X)
 830
 831
 832 /* Node: Condition Code */
 833
 834 #define EXTRA_CC_MODES                          \
 835  CC(CC_UNSmode, "CC_UNS")                       \
 836  CC(CC_FPmode, "CC_FP")                         \
 837  CC(CC_FPEQmode, "CC_FPEQ")                     \
 838  CC(CC_FUNmode, "CC_FUN")
 839
 840 #define SELECT_CC_MODE(OP, X, Y)                \
 841  mmix_select_cc_mode (OP, X, Y)
 842
 843 #define CANONICALIZE_COMPARISON(CODE, OP0, OP1)         \
 844  mmix_canonicalize_comparison (&(CODE), &(OP0), &(OP1));
 845
 846 #define REVERSIBLE_CC_MODE(MODE)                \
 847  mmix_reversible_cc_mode (MODE)
 848
 849
 850 /* Node: Costs */
 851
 852 /* This one takes on both the RTX_COSTS and CONST_COSTS tasks.  */
 853 #define DEFAULT_RTX_COSTS(X, CODE, OUTER_CODE)                  \
 854  {                                                              \
 855    int mmix_rtx_cost;                                           \
 856    if (mmix_rtx_cost_recalculated (X, CODE, OUTER_CODE,         \
 857                                    &mmix_rtx_cost))             \
 858      return mmix_rtx_cost;                                      \
 859  }
 860
 861 #define ADDRESS_COST(ADDRESS) mmix_address_cost (ADDRESS)
 862
 863 /* The special registers can only move to and from general regs, and we
 864    need to check that their constraints match, so say 3 for them.  */
 865 /* WARNING: gcc-2.7.2.2 i686-pc-linux-gnulibc1 (as shipped with RH 4.2)
 866    miscompiles reload1.c:reload_cse_simplify_set; a call to
 867    reload_cse_regno_equal_p is missing when checking if a substitution of
 868    a register setting is valid if this is defined to just the expression
 869    in mmix_register_move_cost.
 870
 871    Symptom: a (all?) register setting is optimized away for e.g.
 872    "char *p1(char *p) { return p+1; }" and the value of register zero ($0)
 873    is returned.
 874
 875    We can workaround by making this a function call - unknown if this
 876    causes dire speed effects.  */
 877 #define REGISTER_MOVE_COST(MODE, FROM, TO) \
 878  mmix_register_move_cost (MODE, FROM, TO)
 879
 880 #define SLOW_BYTE_ACCESS 0
 881
 882
 883 /* Node: Sections */
 884
 885 /* This must be a constant string, since it's used in crtstuff.c.  */
 886 #define TEXT_SECTION_ASM_OP \
 887  "\t.text ! mmixal:= 9H LOC 8B"
 888
 889 /* FIXME: Not documented.  */
 890 #define DATA_SECTION_ASM_OP \
 891  mmix_data_section_asm_op ()
 892
 893 /* Stuff copied from elfos.h.  */
 894 #define EXTRA_SECTIONS in_const
 895
 896 #define EXTRA_SECTION_FUNCTIONS         \
 897   CONST_SECTION_FUNCTION
 898
 899 #define READONLY_DATA_SECTION() const_section ()
 900
 901 #define CONST_SECTION_ASM_OP    "\t.section\t.rodata"
 902
 903 #define CONST_SECTION_FUNCTION                                  \
 904 void                                                            \
 905 const_section ()                                                \
 906 {                                                               \
 907   if (in_section != in_const)                                   \
 908     {                                                           \
 909       fprintf (asm_out_file, "%s\n", CONST_SECTION_ASM_OP);     \
 910       in_section = in_const;                                    \
 911     }                                                           \
 912 }
 913
 914 #undef  SELECT_RTX_SECTION
 915 #define SELECT_RTX_SECTION(MODE, RTX, ALIGN) const_section ()
 916
 917 #define SELECT_SECTION(DECL, RELOC, ALIGN) \
 918  mmix_select_section (DECL, RELOC, ALIGN)
 919
 920 #define ENCODE_SECTION_INFO(DECL) \
 921  mmix_encode_section_info (DECL)
 922
 923 #define STRIP_NAME_ENCODING(VAR, SYM_NAME) \
 924  (VAR) = mmix_strip_name_encoding (SYM_NAME)
 925
 926 #define UNIQUE_SECTION(DECL, RELOC) \
 927   mmix_unique_section (decl, reloc)
 928
 929 /* Node: PIC */
 930 /* (empty) */
 931
 932
 933 /* Node: File Framework */
 934
 935 #define ASM_FILE_START(STREAM) \
 936  mmix_asm_file_start (STREAM)
 937
 938 #define ASM_FILE_END(STREAM) \
 939  mmix_asm_file_end (STREAM)
 940
 941 #define ASM_IDENTIFY_GCC(STREAM) \
 942  mmix_asm_identify_gcc (STREAM)
 943
 944 /* While any other punctuation character but ";" would do, we prefer "%"
 945    or "!"; "!" is an unary operator and so will not be mistakenly included
 946    in correctly formed expressions.  The hash character adds mass; catches
 947    the eye.  We can't have it as a comment char by itself, since it's a
 948    hex-number prefix.  */
 949 #define ASM_COMMENT_START "!#"
 950
 951 /* These aren't currently functional.  We just keep them as markers.  */
 952 #define ASM_APP_ON "%APP\n"
 953 #define ASM_APP_OFF "%NO_APP\n"
 954
 955 #define ASM_OUTPUT_SOURCE_FILENAME(STREAM, NAME) \
 956  mmix_asm_output_source_filename (STREAM, NAME)
 957
 958 #define OUTPUT_QUOTED_STRING(STREAM, STRING) \
 959  mmix_output_quoted_string (STREAM, STRING, strlen (STRING))
 960
 961 #define ASM_OUTPUT_SOURCE_LINE(STREAM, LINE) \
 962  mmix_asm_output_source_line  (STREAM, LINE)
 963
 964 #define TARGET_ASM_NAMED_SECTION default_elf_asm_named_section
 965
 966
 967 /* Node: Data Output */
 968
 969 #define ASM_OUTPUT_ASCII(STREAM, PTR, LEN) \
 970  mmix_asm_output_ascii (STREAM, PTR, LEN)
 971
 972 /* Node: Uninitialized Data */
 973
 974 #define ASM_OUTPUT_ALIGNED_COMMON(ST, N, S, A) \
 975  mmix_asm_output_aligned_common (ST, N, S, A)
 976
 977 #define ASM_OUTPUT_ALIGNED_LOCAL(ST, N, S, A) \
 978  mmix_asm_output_aligned_local (ST, N, S, A)
 979
 980
 981 /* Node: Label Output */
 982
 983 #define ASM_OUTPUT_LABEL(STREAM, NAME) \
 984  mmix_asm_output_label (STREAM, NAME)
 985
 986 #define ASM_DECLARE_REGISTER_GLOBAL(STREAM, DECL, REGNO, NAME) \
 987  mmix_asm_declare_register_global (STREAM, DECL, REGNO, NAME)
 988
 989 #define ASM_GLOBALIZE_LABEL(STREAM, NAME) \
 990  mmix_asm_globalize_label (STREAM, NAME)
 991
 992 #define ASM_WEAKEN_LABEL(STREAM, NAME) \
 993  mmix_asm_weaken_label (STREAM, NAME)
 994
 995 #define MAKE_DECL_ONE_ONLY(DECL) \
 996  mmix_make_decl_one_only (DECL)
 997
 998 #define ASM_OUTPUT_LABELREF(STREAM, NAME) \
 999  mmix_asm_output_labelref (STREAM, NAME)
1000
1001 #define ASM_OUTPUT_INTERNAL_LABEL(STREAM, PREFIX, NUM) \
1002  mmix_asm_output_internal_label (STREAM, PREFIX, NUM)
1003
1004 /* We insert a ":" to disambiguate against user symbols like L5.  */
1005 #define ASM_GENERATE_INTERNAL_LABEL(LABEL, PREFIX, NUM) \
1006  sprintf (LABEL, "*%s:%ld", PREFIX, (long)(NUM))
1007
1008 /* Insert "::"; these are rarer than internal labels.  FIXME: Make sure no
1009    ":" is seen in the object file; we don't really want that mmixal
1010    feature visible there.  We don't want the default, which uses a dot;
1011    that'd be incompatible with mmixal.  */
1012 #define ASM_FORMAT_PRIVATE_NAME(OUTPUT, NAME, LABELNO)          \
1013  ((OUTPUT) = (char *) alloca (strlen ((NAME)) + 2 + 10),        \
1014   sprintf ((OUTPUT), "%s::%d", (NAME), (LABELNO)))
1015
1016 #define ASM_OUTPUT_DEF(STREAM, NAME, VALUE) \
1017  mmix_asm_output_def (STREAM, NAME, VALUE)
1018
1019 #define ASM_OUTPUT_DEFINE_LABEL_DIFFERENCE_SYMBOL(STREAM, SY, HI, LO) \
1020  mmix_asm_output_define_label_difference_symbol (STREAM, SY, HI, LO)
1021
1022
1023 /* Node: Macros for Initialization */
1024 /* We're compiling to ELF and linking to MMO; all ELF features that GCC
1025    care for are there.  FIXME: Are they?  */
1026
1027 /* These must be constant strings, since they're used in crtstuff.c.  */
1028 #define INIT_SECTION_ASM_OP "\t.section .init,\"ax\" ! mmixal-incompatible"
1029
1030 #define FINI_SECTION_ASM_OP "\t.section .fini,\"ax\" ! mmixal-incompatible"
1031
1032 #define OBJECT_FORMAT_ELF
1033
1034
1035 /* Node: Instruction Output */
1036
1037 /* The non-$ register names must be prefixed with ":", since they're
1038    affected by PREFIX.  We provide the non-colon names as additional
1039    names.  */
1040 #define REGISTER_NAMES                                                  \
1041  {"$0", "$1", "$2", "$3", "$4", "$5", "$6", "$7",                       \
1042   "$8", "$9", "$10", "$11", "$12", "$13", "$14", "$15",                 \
1043   "$16", "$17", "$18", "$19", "$20", "$21", "$22", "$23",               \
1044   "$24", "$25", "$26", "$27", "$28", "$29", "$30", "$31",               \
1045   "$32", "$33", "$34", "$35", "$36", "$37", "$38", "$39",               \
1046   "$40", "$41", "$42", "$43", "$44", "$45", "$46", "$47",               \
1047   "$48", "$49", "$50", "$51", "$52", "$53", "$54", "$55",               \
1048   "$56", "$57", "$58", "$59", "$60", "$61", "$62", "$63",               \
1049   "$64", "$65", "$66", "$67", "$68", "$69", "$70", "$71",               \
1050   "$72", "$73", "$74", "$75", "$76", "$77", "$78", "$79",               \
1051   "$80", "$81", "$82", "$83", "$84", "$85", "$86", "$87",               \
1052   "$88", "$89", "$90", "$91", "$92", "$93", "$94", "$95",               \
1053   "$96", "$97", "$98", "$99", "$100", "$101", "$102", "$103",           \
1054   "$104", "$105", "$106", "$107", "$108", "$109", "$110", "$111",       \
1055   "$112", "$113", "$114", "$115", "$116", "$117", "$118", "$119",       \
1056   "$120", "$121", "$122", "$123", "$124", "$125", "$126", "$127",       \
1057   "$128", "$129", "$130", "$131", "$132", "$133", "$134", "$135",       \
1058   "$136", "$137", "$138", "$139", "$140", "$141", "$142", "$143",       \
1059   "$144", "$145", "$146", "$147", "$148", "$149", "$150", "$151",       \
1060   "$152", "$153", "$154", "$155", "$156", "$157", "$158", "$159",       \
1061   "$160", "$161", "$162", "$163", "$164", "$165", "$166", "$167",       \
1062   "$168", "$169", "$170", "$171", "$172", "$173", "$174", "$175",       \
1063   "$176", "$177", "$178", "$179", "$180", "$181", "$182", "$183",       \
1064   "$184", "$185", "$186", "$187", "$188", "$189", "$190", "$191",       \
1065   "$192", "$193", "$194", "$195", "$196", "$197", "$198", "$199",       \
1066   "$200", "$201", "$202", "$203", "$204", "$205", "$206", "$207",       \
1067   "$208", "$209", "$210", "$211", "$212", "$213", "$214", "$215",       \
1068   "$216", "$217", "$218", "$219", "$220", "$221", "$222", "$223",       \
1069   "$224", "$225", "$226", "$227", "$228", "$229", "$230", "$231",       \
1070   "$232", "$233", "$234", "$235", "$236", "$237", "$238", "$239",       \
1071   "$240", "$241", "$242", "$243", "$244", "$245", "$246", "$247",       \
1072   "$248", "$249", "$250", "$251", "$252", "$253", "$254", "$255",       \
1073   ":rD",  ":rE",  ":rH",  ":rJ",  ":rR",  "ap_!BAD!"}
1074
1075 #define ADDITIONAL_REGISTER_NAMES                       \
1076  {{"sp", 254}, {":sp", 254}, {"rD", 256}, {"rE", 257},  \
1077   {"rH", 258}, {"rJ", 259}}
1078
1079 #define PRINT_OPERAND(STREAM, X, CODE) \
1080  mmix_print_operand (STREAM, X, CODE)
1081
1082 #define PRINT_OPERAND_PUNCT_VALID_P(CODE) \
1083  mmix_print_operand_punct_valid_p (CODE)
1084
1085 #define PRINT_OPERAND_ADDRESS(STREAM, X) \
1086  mmix_print_operand_address (STREAM, X)
1087
1088 #if 0
1089 #define USER_LABEL_PREFIX "_"
1090 #endif
1091
1092 #define ASM_OUTPUT_REG_PUSH(STREAM, REGNO) \
1093  mmix_asm_output_reg_push (STREAM, REGNO)
1094
1095 #define ASM_OUTPUT_REG_POP(STREAM, REGNO) \
1096  mmix_asm_output_reg_pop (STREAM, REGNO)
1097
1098
1099 /* Node: Dispatch Tables */
1100
1101 /* We define both types, since SImode is the better, but DImode the only
1102    possible for mmixal so that's the one actually used.  */
1103 #define ASM_OUTPUT_ADDR_DIFF_ELT(STREAM, BODY, VALUE, REL) \
1104  mmix_asm_output_addr_diff_elt (STREAM, BODY, VALUE, REL)
1105
1106 #define ASM_OUTPUT_ADDR_VEC_ELT(STREAM, VALUE) \
1107  mmix_asm_output_addr_vec_elt (STREAM, VALUE)
1108
1109
1110 /* Node: Exception Region Output */
1111 /* (empty) */
1112
1113 /* Node: Alignment Output */
1114
1115 #define ASM_OUTPUT_SKIP(STREAM, NBYTES) \
1116  mmix_asm_output_skip (STREAM, NBYTES)
1117
1118 #define ASM_OUTPUT_ALIGN(STREAM, POWER) \
1119  mmix_asm_output_align (STREAM, POWER)
1120
1121
1122 /* Node: All Debuggers */
1123
1124 #define DBX_REGISTER_NUMBER(REGNO) \
1125  mmix_dbx_register_number (REGNO)
1126
1127
1128 /* Node: DBX Options */
1129 /* (empty) */
1130 /* Node: DBX Hooks */
1131 /* (empty) */
1132 /* Node: File Names and DBX */
1133 /* (empty) */
1134
1135
1136 /* Node: SDB and DWARF */
1137 #define DWARF2_DEBUGGING_INFO
1138 #define DWARF2_ASM_LINE_DEBUG_INFO 1
1139
1140 /* Node: Cross-compilation */
1141
1142 /* FIXME: I don't know whether it is best to tweak emit-rtl.c to handle
1143    the case where sizeof (float) == word_size / 2 on the target, or to fix
1144    real.h to define REAL_ARITHMETIC in that case.  Anyway, it should be
1145    documented that a target can define this to force emulation.  Note that
1146    we don't check #ifdef CROSS_COMPILE here; not even if mmix gets
1147    self-hosted must we do that.  Case gcc.c-torture/compile/930611-1.c.  */
1148 #define REAL_ARITHMETIC
1149
1150
1151 /* Node: Misc */
1152
1153 #define PREDICATE_CODES                         \
1154  {"mmix_reg_cc_operand", {SUBREG, REG}},        \
1155  {"mmix_foldable_comparison_operator",          \
1156   {NE, EQ, GE, GT, LE, LT}},                    \
1157  /* All '<', actually.  */                      \
1158  {"mmix_comparison_operator",                   \
1159   {NE, EQ, GE, GT, LE, LT, GEU, GTU, LEU,       \
1160    LTU, UNORDERED, ORDERED, UNEQ, UNGE, UNLE,   \
1161    UNLT, LTGT}},                                \
1162  {"mmix_symbolic_or_address_operand",           \
1163   {SYMBOL_REF, LABEL_REF, CONST,                \
1164    SUBREG, REG, PLUS}},                         \
1165  {"mmix_reg_or_constant_operand",               \
1166   {CONST_INT, CONST_DOUBLE, SUBREG, REG}},      \
1167  {"mmix_reg_or_8bit_or_256_operand",            \
1168   {CONST_INT, CONST_DOUBLE, SUBREG, REG}},      \
1169  {"mmix_reg_or_8bit_operand",                   \
1170   {CONST_INT, CONST_DOUBLE, SUBREG, REG}},      \
1171  {"mmix_reg_or_0_operand",                      \
1172   {CONST_INT, CONST_DOUBLE, SUBREG, REG}},
1173
1174 #define SPECIAL_MODE_PREDICATES "mmix_symbolic_or_address_operand",
1175
1176 /* There's no way to get a PC-relative offset into tables for SImode, so
1177    for the moment we have absolute entries in DImode.
1178    When we're going ELF, these should be SImode and 1.  */
1179 #define CASE_VECTOR_MODE DImode
1180 #define CASE_VECTOR_PC_RELATIVE 0
1181
1182 #define WORD_REGISTER_OPERATIONS
1183
1184 /* We have a choice, which makes this yet another parameter to tweak.  The
1185    gut feeling is currently that SIGN_EXTEND wins; "int" is more frequent
1186    than "unsigned int", and we have signed characters.  FIXME: measure.  */
1187 #define LOAD_EXTEND_OP(MODE) (TARGET_ZERO_EXTEND ? ZERO_EXTEND : SIGN_EXTEND)
1188
1189 /* Whatever.  I don't really know.  This has worked before.  It's also
1190    what everybody else is using.  */
1191 #define EASY_DIV_EXPR TRUNC_DIV_EXPR
1192
1193 #define MOVE_MAX 8
1194
1195 #define TRULY_NOOP_TRUNCATION(OUTPREC, INPREC) 1
1196
1197 /* We have a choice here too.  */
1198 #if 0
1199 /* FIXME:  Revisit, we don't have scc expanders yet.  */
1200 #define STORE_FLAG_VALUE 1
1201 #endif
1202
1203 #define Pmode DImode
1204
1205 #define FUNCTION_MODE QImode
1206
1207 /* When in due time we *will* have some specific headers.  */
1208 #define NO_IMPLICIT_EXTERN_C
1209
1210 #define HANDLE_SYSV_PRAGMA
1211
1212 /* These are checked.  */
1213 #define DOLLARS_IN_IDENTIFIERS 0
1214 #define NO_DOLLAR_IN_LABEL
1215 #define NO_DOT_IN_LABEL
1216
1217 #endif /* GCC_MMIX_H */
1218 /*
1219  * Local variables:
1220  * eval: (c-set-style "gnu")
1221  * indent-tabs-mode: t
1222  * End:
1223  */