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 /* Put unused option values here.  */
 128 extern const char *mmix_cc1_ignored_option;
 129
 130 #define TARGET_OPTIONS                                  \
 131    {{"set-program-start=", &mmix_cc1_ignored_option,    \
 132   N_("Set start-address of the program"), 0},           \
 133     {"set-data-start=", &mmix_cc1_ignored_option,       \
 134   N_("Set start-address of data"), 0} }
 135
 136 /* FIXME: There's no provision for profiling here.  */
 137 #define STARTFILE_SPEC  \
 138   "crti%O%s crtbegin%O%s"
 139
 140 #define ENDFILE_SPEC "crtend%O%s crtn%O%s"
 141
 142 /* Node: Run-time Target */
 143
 144 /* Define __LONG_MAX__, since we're advised not to change glimits.h.  */
 145 #define TARGET_CPU_CPP_BUILTINS()                               \
 146   do                                                            \
 147     {                                                           \
 148       builtin_define ("__mmix__");                              \
 149       builtin_define ("__MMIX__");                              \
 150       if (TARGET_ABI_GNU)                                       \
 151         builtin_define ("__MMIX_ABI_GNU__");                    \
 152       else                                                      \
 153         builtin_define ("__MMIX_ABI_MMIXWARE__");               \
 154     }                                                           \
 155   while (0)
 156
 157 extern int target_flags;
 158
 159 #define TARGET_MASK_LIBFUNCS 1
 160 #define TARGET_MASK_ABI_GNU 2
 161 #define TARGET_MASK_FCMP_EPSILON 4
 162 #define TARGET_MASK_ZERO_EXTEND 8
 163 #define TARGET_MASK_KNUTH_DIVISION 16
 164 #define TARGET_MASK_TOPLEVEL_SYMBOLS 32
 165 #define TARGET_MASK_BRANCH_PREDICT 64
 166 #define TARGET_MASK_USE_RETURN_INSN 128
 167
 168 /* We use the term "base address" since that's what Knuth uses.  The base
 169    address goes in a global register.  When addressing, it's more like
 170    "base address plus offset", with the offset being 0..255 from the base,
 171    which itself can be a symbol plus an offset.  The effect is like having
 172    a constant pool in global registers, code offsetting from those
 173    registers (automatically causing a request for a suitable constant base
 174    address register) without having to know the specific register or the
 175    specific offset.  The setback is that there's a limited number of
 176    registers, and you'll not find out until link time whether you
 177    should have compiled with -mno-base-addresses.  */
 178 #define TARGET_MASK_BASE_ADDRESSES 128
 179
 180 /* FIXME: Get rid of this one.  */
 181 #define TARGET_LIBFUNC (target_flags & TARGET_MASK_LIBFUNCS)
 182 #define TARGET_ABI_GNU (target_flags & TARGET_MASK_ABI_GNU)
 183 #define TARGET_FCMP_EPSILON (target_flags & TARGET_MASK_FCMP_EPSILON)
 184 #define TARGET_ZERO_EXTEND (target_flags & TARGET_MASK_ZERO_EXTEND)
 185 #define TARGET_KNUTH_DIVISION (target_flags & TARGET_MASK_KNUTH_DIVISION)
 186 #define TARGET_TOPLEVEL_SYMBOLS (target_flags & TARGET_MASK_TOPLEVEL_SYMBOLS)
 187 #define TARGET_BRANCH_PREDICT (target_flags & TARGET_MASK_BRANCH_PREDICT)
 188 #define TARGET_BASE_ADDRESSES (target_flags & TARGET_MASK_BASE_ADDRESSES)
 189 #define TARGET_USE_RETURN_INSN (target_flags & TARGET_MASK_USE_RETURN_INSN)
 190
 191 #define TARGET_DEFAULT \
 192  (TARGET_MASK_BRANCH_PREDICT | TARGET_MASK_BASE_ADDRESSES \
 193   | TARGET_MASK_USE_RETURN_INSN)
 194
 195 /* FIXME: Provide a way to *load* the epsilon register.  */
 196 #define TARGET_SWITCHES                                                 \
 197  {{"libfuncs",          TARGET_MASK_LIBFUNCS,                           \
 198    N_("For intrinsics library: pass all parameters in registers")},     \
 199   {"no-libfuncs",       -TARGET_MASK_LIBFUNCS, ""},                     \
 200   {"abi=mmixware",      -TARGET_MASK_ABI_GNU,                           \
 201    N_("Use register stack for parameters and return value")},           \
 202   {"abi=gnu",           TARGET_MASK_ABI_GNU,                            \
 203    N_("Use call-clobbered registers for parameters and return value")}, \
 204   {"epsilon",           TARGET_MASK_FCMP_EPSILON,                       \
 205    N_("Use epsilon-respecting floating point compare instructions")},   \
 206   {"no-epsilon",        -TARGET_MASK_FCMP_EPSILON, ""},                 \
 207   {"zero-extend",       TARGET_MASK_ZERO_EXTEND,                        \
 208    N_("Use zero-extending memory loads, not sign-extending ones")},     \
 209   {"no-zero-extend",    -TARGET_MASK_ZERO_EXTEND,  ""},                 \
 210   {"knuthdiv",          TARGET_MASK_KNUTH_DIVISION,                     \
 211    N_("Generate divide results with reminder having the same sign as the\
 212  divisor (not the dividend)")},                                         \
 213   {"no-knuthdiv",       -TARGET_MASK_KNUTH_DIVISION, ""},               \
 214   {"toplevel-symbols",  TARGET_MASK_TOPLEVEL_SYMBOLS,                   \
 215    N_("Prepend global symbols with \":\" (for use with PREFIX)")},      \
 216   {"no-toplevel-symbols", -TARGET_MASK_TOPLEVEL_SYMBOLS,                \
 217    N_("Do not provide a default start-address 0x100 of the program")},  \
 218   {"elf", 0,                                                            \
 219    N_("Link to emit program in ELF format (rather than mmo)")},         \
 220   {"branch-predict",    TARGET_MASK_BRANCH_PREDICT,                     \
 221    N_("Use P-mnemonics for branches statically predicted as taken")},   \
 222   {"no-branch-predict", -TARGET_MASK_BRANCH_PREDICT,                    \
 223    N_("Don't use P-mnemonics for branches")},                           \
 224   {"base-addresses",    TARGET_MASK_BASE_ADDRESSES,                     \
 225    N_("Use addresses that allocate global registers")},                 \
 226   {"no-base-addresses", -TARGET_MASK_BASE_ADDRESSES,                    \
 227    N_("Do not use addresses that allocate global registers")},          \
 228   {"single-exit",       -TARGET_MASK_USE_RETURN_INSN,                   \
 229    N_("Generate a single exit point for each function")},               \
 230   {"no-single-exit",    TARGET_MASK_USE_RETURN_INSN,                    \
 231    N_("Do not generate a single exit point for each function")},        \
 232   {"",                  TARGET_DEFAULT, ""}}
 233
 234 /* Unfortunately, this must not reference anything in "mmix.c".  */
 235 #define TARGET_VERSION \
 236   fprintf (stderr, " (MMIX)")
 237
 238 #define OVERRIDE_OPTIONS mmix_override_options ()
 239
 240 #define OPTIMIZATION_OPTIONS(LEVEL, SIZE)       \
 241   do                                            \
 242     {                                           \
 243       if (LEVEL >= 1)                           \
 244         flag_regmove = TRUE;                    \
 245                                                 \
 246       if (SIZE || LEVEL > 1)                    \
 247         {                                       \
 248           flag_omit_frame_pointer = TRUE;       \
 249           flag_strength_reduce = FALSE;         \
 250         }                                       \
 251     }                                           \
 252   while (0)
 253
 254 /* This one will have to wait a little bit; right now we can't debug
 255    neither with or without a frame-pointer.  */
 256 /* #define CAN_DEBUG_WITHOUT_FP */
 257
 258
 259 /* Node: Per-Function Data */
 260 #define INIT_EXPANDERS mmix_init_expanders ()
 261
 262
 263 /* Node: Storage Layout */
 264 /* I see no bit-field instructions.  Anyway, the common order is from low
 265    to high, as the power of two, hence little-endian.  */
 266 #define BITS_BIG_ENDIAN 0
 267 #define BYTES_BIG_ENDIAN 1
 268 #define WORDS_BIG_ENDIAN 1
 269 #define FLOAT_WORDS_BIG_ENDIAN 1
 270 #define UNITS_PER_WORD 8
 271
 272 /* FIXME: Promotion of modes currently generates slow code, extending
 273    before every operation.  */
 274 /* I'm a little bit undecided about this one.  It might be beneficial to
 275    promote all operations.  */
 276
 277 #define PROMOTE_FUNCTION_MODE(MODE, UNSIGNEDP, TYPE)    \
 278  do {                                           \
 279   if (GET_MODE_CLASS (MODE) == MODE_INT         \
 280       && GET_MODE_SIZE (MODE) < 8)              \
 281    {                                            \
 282      (MODE) = DImode;                           \
 283      /* Do the following some time later,       \
 284         scrutinizing differences.  */           \
 285      if (0) (UNSIGNEDP) = 0;                    \
 286    }                                            \
 287  } while (0)
 288
 289 /* We need to align everything to 64 bits that can affect the alignment
 290    of other types.  Since address N is interpreted in MMIX as (N modulo
 291    access_size), we must align.  */
 292 #define PARM_BOUNDARY 64
 293 #define STACK_BOUNDARY 64
 294 #define FUNCTION_BOUNDARY 32
 295 #define BIGGEST_ALIGNMENT 64
 296
 297 /* This one is only used in the ADA front end.  */
 298 #define MINIMUM_ATOMIC_ALIGNMENT 8
 299
 300 /* Copied from elfos.h.  */
 301 #define MAX_OFILE_ALIGNMENT (32768 * 8)
 302
 303 #define DATA_ALIGNMENT(TYPE, BASIC_ALIGN) \
 304  mmix_data_alignment (TYPE, BASIC_ALIGN)
 305
 306 #define CONSTANT_ALIGNMENT(CONSTANT, BASIC_ALIGN) \
 307  mmix_constant_alignment (CONSTANT, BASIC_ALIGN)
 308
 309 #define LOCAL_ALIGNMENT(TYPE, BASIC_ALIGN) \
 310  mmix_local_alignment (TYPE, BASIC_ALIGN)
 311
 312 /* Following other ports, this seems to most commonly be the word-size,
 313    so let's do that here too.  */
 314 #define EMPTY_FIELD_BOUNDARY 64
 315
 316 /* We chose to have this low solely for similarity with the alpha.  It has
 317    nothing to do with passing the tests dg/c99-scope-2 and
 318    execute/align-1.c.  Nothing.  Though the tests seem wrong.  Padding of
 319    the structure is automatically added to get alignment when needed if we
 320    set this to just byte-boundary.  */
 321 #define STRUCTURE_SIZE_BOUNDARY 8
 322
 323 /* The lower bits are ignored.  */
 324 #define STRICT_ALIGNMENT 1
 325
 326
 327 /* Node: Type Layout */
 328
 329 /* It might seem more natural to have 64-bit ints on a 64-bit machine,
 330    but then an occasional MMIX programmer needs to know how to put a lot
 331    of __attribute__ stuff to get to the 8, 16 and 32-bit modes rather
 332    than the "intuitive" char, short and int types.  */
 333 #define INT_TYPE_SIZE 32
 334 #define SHORT_TYPE_SIZE 16
 335 #define LONG_LONG_TYPE_SIZE 64
 336
 337 #define FLOAT_TYPE_SIZE 32
 338 #define DOUBLE_TYPE_SIZE 64
 339 #define LONG_DOUBLE_TYPE_SIZE 64
 340
 341 #define DEFAULT_SIGNED_CHAR 1
 342
 343
 344 /* Node: Register Basics */
 345 /* We tell GCC about all 256 general registers, and we also include
 346    rD, rE, rH, rJ, rR and rO (in that order) so we can describe what insns
 347    clobber them.  We use a faked register for the argument pointer.  It is
 348    always eliminated towards the frame-pointer or the stack-pointer, never
 349    output in assembly.  Any fixed register would do for this, like $255,
 350    but future debugging is easier when using a separate register.  It
 351    counts as a global register for pseudorandom reasons.  */
 352 #define FIRST_PSEUDO_REGISTER 263
 353
 354 /* We treat general registers with no assigned purpose as fixed.  The
 355    stack pointer, $254, is also fixed.  Register $255 is referred to as a
 356    temporary register in the MMIX papers, and used as such in mmixal, so
 357    it should not be used as a stack pointer.  We set it to fixed, and use
 358    it "manually" at times of despair.  */
 359 #define FIXED_REGISTERS \
 360  { 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, \
 361    0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, \
 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, 1, 1, 1, 1, 1, 1, 1, 1, 1, \
 365    1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, \
 366    1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, \
 367    1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, \
 368    1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, \
 369    1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, \
 370    1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, \
 371    1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, \
 372    1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, \
 373    1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, \
 374    1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, \
 375    1, 1, 1, 1, 1, 1, 1, 0, 0, 0, 0, 0, 0, 0, 1, 1, \
 376    1, 1, 0, 0, 0, 1, 1 \
 377  }
 378
 379 /* General registers are fixed and therefore "historically" marked
 380    call-used.  (FIXME: This has changed).  Registers $15..$31 are
 381    call-clobbered; we'll put arguments in $16 and up, and we need $15 for
 382    the MMIX register-stack "hole".  */
 383 #define CALL_USED_REGISTERS \
 384  { 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 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, 1, 1, 1, \
 390    1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, \
 391    1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, \
 392    1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, \
 393    1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, \
 394    1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, \
 395    1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, \
 396    1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, \
 397    1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, \
 398    1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, \
 399    1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 0, 1, 1, \
 400    1, 1, 1, 1, 1, 1, 1 \
 401  }
 402
 403 #define CONDITIONAL_REGISTER_USAGE mmix_conditional_register_usage ()
 404
 405 /* No INCOMING_REGNO or OUTGOING_REGNO, since those macros are not usable
 406    for MMIX: it doesn't have a fixed register window size.  FIXME: Perhaps
 407    we should say something about $0..$15 may sometimes be the incoming
 408    $16..$31.  Those macros need better documentation; it looks like
 409    they're just bogus and that FUNCTION_INCOMING_ARG_REGNO_P and
 410    FUNCTION_OUTGOING_VALUE should be used where they're used.  For the
 411    moment, do nothing; things seem to work anyway.  */
 412
 413 /* Defining LOCAL_REGNO is necessary in presence of prologue/epilogue,
 414    else GCC will be confused that those registers aren't saved and
 415    restored.  */
 416 #define LOCAL_REGNO(REGNO) mmix_local_regno (REGNO)
 417
 418 /* Node: Allocation Order */
 419
 420 /* We should allocate registers from 0 to 31 by increasing number, because
 421    I think that's what people expect.  Beyond that, just use
 422    call-clobbered global registers first, then call-clobbered special
 423    registers.  Last, the fixed registers.  */
 424 #define MMIX_MMIXWARE_ABI_REG_ALLOC_ORDER       \
 425  { 0, 1, 2, 3, 4, 5, 6, 7,                      \
 426    8, 9, 10, 11, 12, 13, 14, 15,                \
 427    16, 17, 18, 19, 20, 21, 22, 23,              \
 428    24, 25, 26, 27, 28, 29, 30, 31,              \
 429                                                 \
 430    252, 251, 250, 249, 248, 247,                \
 431                                                 \
 432    253,                                         \
 433                                                 \
 434    258, 260, 259,                               \
 435                                                 \
 436    32, 33, 34, 35, 36, 37, 38, 39,              \
 437    40, 41, 42, 43, 44, 45, 46, 47,              \
 438    48, 49, 50, 51, 52, 53, 54, 55,              \
 439    56, 57, 58, 59, 60, 61, 62, 63,              \
 440    64, 65, 66, 67, 68, 69, 70, 71,              \
 441    72, 73, 74, 75, 76, 77, 78, 79,              \
 442    80, 81, 82, 83, 84, 85, 86, 87,              \
 443    88, 89, 90, 91, 92, 93, 94, 95,              \
 444    96, 97, 98, 99, 100, 101, 102, 103,          \
 445    104, 105, 106, 107, 108, 109, 110, 111,      \
 446    112, 113, 114, 115, 116, 117, 118, 119,      \
 447    120, 121, 122, 123, 124, 125, 126, 127,      \
 448    128, 129, 130, 131, 132, 133, 134, 135,      \
 449    136, 137, 138, 139, 140, 141, 142, 143,      \
 450    144, 145, 146, 147, 148, 149, 150, 151,      \
 451    152, 153, 154, 155, 156, 157, 158, 159,      \
 452    160, 161, 162, 163, 164, 165, 166, 167,      \
 453    168, 169, 170, 171, 172, 173, 174, 175,      \
 454    176, 177, 178, 179, 180, 181, 182, 183,      \
 455    184, 185, 186, 187, 188, 189, 190, 191,      \
 456    192, 193, 194, 195, 196, 197, 198, 199,      \
 457    200, 201, 202, 203, 204, 205, 206, 207,      \
 458    208, 209, 210, 211, 212, 213, 214, 215,      \
 459    216, 217, 218, 219, 220, 221, 222, 223,      \
 460    224, 225, 226, 227, 228, 229, 230, 231,      \
 461    232, 233, 234, 235, 236, 237, 238, 239,      \
 462    240, 241, 242, 243, 244, 245, 246,           \
 463                                                 \
 464    254, 255, 256, 257, 261, 262                 \
 465  }
 466
 467 /* As a convenience, we put this nearby, for ease of comparison.
 468    First, call-clobbered registers in reverse order of assignment as
 469    parameters (also the top ones; not because they're parameters, but
 470    for continuity).
 471
 472    Second, saved registers that go on the register-stack.
 473
 474    Third, special registers rH, rR and rJ.  They should not normally be
 475    allocated, but since they're call-clobbered, it is cheaper to use one
 476    of them than using a call-saved register for a call-clobbered use,
 477    assuming it is referenced a very limited number of times.  Other global
 478    and fixed registers come next; they are never allocated.  */
 479 #define MMIX_GNU_ABI_REG_ALLOC_ORDER            \
 480  { 252, 251, 250, 249, 248, 247, 246,           \
 481    245, 244, 243, 242, 241, 240, 239, 238,      \
 482    237, 236, 235, 234, 233, 232, 231,           \
 483                                                 \
 484    0, 1, 2, 3, 4, 5, 6, 7,                      \
 485    8, 9, 10, 11, 12, 13, 14, 15,                \
 486    16, 17, 18, 19, 20, 21, 22, 23,              \
 487    24, 25, 26, 27, 28, 29, 30, 31,              \
 488                                                 \
 489    253,                                         \
 490                                                 \
 491    258, 260, 259,                               \
 492                                                 \
 493    32, 33, 34, 35, 36, 37, 38, 39,              \
 494    40, 41, 42, 43, 44, 45, 46, 47,              \
 495    48, 49, 50, 51, 52, 53, 54, 55,              \
 496    56, 57, 58, 59, 60, 61, 62, 63,              \
 497    64, 65, 66, 67, 68, 69, 70, 71,              \
 498    72, 73, 74, 75, 76, 77, 78, 79,              \
 499    80, 81, 82, 83, 84, 85, 86, 87,              \
 500    88, 89, 90, 91, 92, 93, 94, 95,              \
 501    96, 97, 98, 99, 100, 101, 102, 103,          \
 502    104, 105, 106, 107, 108, 109, 110, 111,      \
 503    112, 113, 114, 115, 116, 117, 118, 119,      \
 504    120, 121, 122, 123, 124, 125, 126, 127,      \
 505    128, 129, 130, 131, 132, 133, 134, 135,      \
 506    136, 137, 138, 139, 140, 141, 142, 143,      \
 507    144, 145, 146, 147, 148, 149, 150, 151,      \
 508    152, 153, 154, 155, 156, 157, 158, 159,      \
 509    160, 161, 162, 163, 164, 165, 166, 167,      \
 510    168, 169, 170, 171, 172, 173, 174, 175,      \
 511    176, 177, 178, 179, 180, 181, 182, 183,      \
 512    184, 185, 186, 187, 188, 189, 190, 191,      \
 513    192, 193, 194, 195, 196, 197, 198, 199,      \
 514    200, 201, 202, 203, 204, 205, 206, 207,      \
 515    208, 209, 210, 211, 212, 213, 214, 215,      \
 516    216, 217, 218, 219, 220, 221, 222, 223,      \
 517    224, 225, 226, 227, 228, 229, 230,           \
 518                                                 \
 519    254, 255, 256, 257, 261, 262                 \
 520  }
 521
 522 /* The default one.  */
 523 #define REG_ALLOC_ORDER MMIX_MMIXWARE_ABI_REG_ALLOC_ORDER
 524
 525 /* Node: Values in Registers */
 526
 527 #define HARD_REGNO_NREGS(REGNO, MODE)                   \
 528    ((GET_MODE_SIZE (MODE) + UNITS_PER_WORD - 1)         \
 529     / UNITS_PER_WORD)
 530
 531 #define HARD_REGNO_MODE_OK(REGNO, MODE) 1
 532
 533 /* Note that no register can really be accessed in single-float mode, so
 534    we *can* say 1 here.  FIXME:  Will TRT happen for single-float, or do
 535    we have to punt to libgcc1.asm?  */
 536 #define MODES_TIEABLE_P(MODE1, MODE2) 1
 537
 538
 539 /* Node: Leaf Functions */
 540 /* (empty) */
 541
 542
 543 /* Node: Register Classes */
 544
 545 enum reg_class
 546  {
 547    NO_REGS, GENERAL_REGS, REMAINDER_REG, HIMULT_REG,
 548    SYSTEM_REGS, ALL_REGS, LIM_REG_CLASSES
 549  };
 550
 551 #define N_REG_CLASSES (int) LIM_REG_CLASSES
 552
 553 #define REG_CLASS_NAMES                                         \
 554  {"NO_REGS", "GENERAL_REGS", "REMAINDER_REG", "HIMULT_REG",     \
 555   "SYSTEM_REGS", "ALL_REGS"}
 556
 557 /* Note that the contents of each item is always 32 bits.  */
 558 #define REG_CLASS_CONTENTS                      \
 559  {{0, 0, 0, 0, 0, 0, 0, 0, 0},                  \
 560   {~0, ~0, ~0, ~0, ~0, ~0, ~0, ~0, 0x20},       \
 561   {0, 0, 0, 0, 0, 0, 0, 0, 0x10},               \
 562   {0, 0, 0, 0, 0, 0, 0, 0, 4},                  \
 563   {0, 0, 0, 0, 0, 0, 0, 0, 0x7f},               \
 564   {~0, ~0, ~0, ~0, ~0, ~0, ~0, ~0, 0x7f}}
 565
 566 #define REGNO_REG_CLASS(REGNO)                                  \
 567  ((REGNO) <= MMIX_LAST_GENERAL_REGISTER                         \
 568   || (REGNO) == MMIX_ARG_POINTER_REGNUM                         \
 569   ? GENERAL_REGS                                                \
 570   : (REGNO) == MMIX_REMAINDER_REGNUM ? REMAINDER_REG            \
 571   : (REGNO) == MMIX_HIMULT_REGNUM ? HIMULT_REG : SYSTEM_REGS)
 572
 573 #define BASE_REG_CLASS GENERAL_REGS
 574
 575 #define INDEX_REG_CLASS GENERAL_REGS
 576
 577 #define REG_CLASS_FROM_LETTER(CHAR)             \
 578  ((CHAR) == 'x' ? SYSTEM_REGS                   \
 579   : (CHAR) == 'y' ? REMAINDER_REG               \
 580   : (CHAR) == 'z' ? HIMULT_REG : NO_REGS)
 581
 582 #define REGNO_OK_FOR_BASE_P(REGNO)                              \
 583  ((REGNO) <= MMIX_LAST_GENERAL_REGISTER                         \
 584   || (REGNO) == MMIX_ARG_POINTER_REGNUM                         \
 585   || (reg_renumber[REGNO] > 0                                   \
 586       && reg_renumber[REGNO] <= MMIX_LAST_GENERAL_REGISTER))
 587
 588 #define REGNO_OK_FOR_INDEX_P(REGNO) REGNO_OK_FOR_BASE_P (REGNO)
 589
 590 #define PREFERRED_RELOAD_CLASS(X, CLASS) \
 591  mmix_preferred_reload_class (X, CLASS)
 592
 593 #define PREFERRED_OUTPUT_RELOAD_CLASS(X, CLASS) \
 594  mmix_preferred_output_reload_class (X, CLASS)
 595
 596 #define SECONDARY_INPUT_RELOAD_CLASS(CLASS, MODE, X) \
 597  mmix_secondary_reload_class (CLASS, MODE, X, 1)
 598
 599 #define SECONDARY_OUTPUT_RELOAD_CLASS(CLASS, MODE, X) \
 600  mmix_secondary_reload_class (CLASS, MODE, X, 0)
 601
 602 #define CLASS_MAX_NREGS(CLASS, MODE) HARD_REGNO_NREGS (CLASS, MODE)
 603
 604 #define CONST_OK_FOR_LETTER_P(VALUE, C) \
 605  mmix_const_ok_for_letter_p (VALUE, C)
 606
 607 #define EXTRA_CONSTRAINT(VALUE, C)      \
 608  mmix_extra_constraint (VALUE, C, MMIX_REG_OK_STRICT)
 609
 610 /* Do we need anything serious here?  Yes, any FLOT constant.  */
 611 #define CONST_DOUBLE_OK_FOR_LETTER_P(VALUE, C)                  \
 612  mmix_const_double_ok_for_letter_p (VALUE, C)
 613
 614
 615 /* Node: Frame Layout */
 616
 617 #define STACK_GROWS_DOWNWARD
 618 #define FRAME_GROWS_DOWNWARD
 619
 620 #define STARTING_FRAME_OFFSET \
 621   mmix_starting_frame_offset ()
 622
 623 #define FIRST_PARM_OFFSET(FUNDECL) 0
 624
 625 #define DYNAMIC_CHAIN_ADDRESS(FRAMEADDR) \
 626  mmix_dynamic_chain_address (FRAMEADDR)
 627
 628 /* FIXME: It seems RETURN_ADDR_OFFSET is undocumented.  */
 629
 630 #define SETUP_FRAME_ADDRESSES() \
 631  mmix_setup_frame_addresses ()
 632
 633 #define RETURN_ADDR_RTX(COUNT, FRAME)           \
 634  mmix_return_addr_rtx (COUNT, FRAME)
 635
 636 /* It's in rJ before we store it somewhere.  */
 637 #define INCOMING_RETURN_ADDR_RTX \
 638  gen_rtx_REG (Pmode, MMIX_INCOMING_RETURN_ADDRESS_REGNUM)
 639
 640 /* FIXME: This does not seem properly documented or cross-indexed.
 641    Nowhere except in the code does it say it *has* to be in the range
 642    0..255, or else it will be truncated.  That goes for the default too.  */
 643 #define DWARF_FRAME_RETURN_COLUMN \
 644  DWARF_FRAME_REGNUM (MMIX_INCOMING_RETURN_ADDRESS_REGNUM)
 645
 646 /* No return address is stored there.  */
 647 #define INCOMING_FRAME_SP_OFFSET 0
 648
 649 /* Node: Stack Checking */
 650 /* (empty) */
 651
 652
 653 /* Node: Exception Handling */
 654
 655 #define EH_RETURN_DATA_REGNO(N) \
 656  mmix_eh_return_data_regno (N)
 657
 658 #define EH_RETURN_STACKADJ_RTX \
 659  mmix_eh_return_stackadj_rtx ()
 660
 661 #define EH_RETURN_HANDLER_RTX \
 662  mmix_eh_return_handler_rtx ()
 663
 664 #define ASM_PREFERRED_EH_DATA_FORMAT(CODE, GLOBAL) \
 665  mmix_asm_preferred_eh_data_format (CODE, GLOBAL)
 666
 667 /* Node: Frame Registers */
 668 #define STACK_POINTER_REGNUM MMIX_STACK_POINTER_REGNUM
 669
 670 /* Perhaps we can use HARD_FRAME_POINTER_REGNUM and decide later on
 671    what register we want to use.  */
 672 #define FRAME_POINTER_REGNUM MMIX_FRAME_POINTER_REGNUM
 673 #define ARG_POINTER_REGNUM MMIX_ARG_POINTER_REGNUM
 674
 675 #define STATIC_CHAIN_REGNUM MMIX_STATIC_CHAIN_REGNUM
 676
 677
 678 /* Node: Elimination */
 679 /* FIXME: Is this requirement built-in?  Anyway, we should try to get rid
 680    of it; we can deduce the value.  */
 681 #define FRAME_POINTER_REQUIRED  current_function_has_nonlocal_label
 682
 683 /* The frame-pointer is stored in a location that either counts to the
 684    offset of incoming parameters, or that counts to the offset of the
 685    frame, so we can't use a single offset.  We therefore eliminate those
 686    two separately.  */
 687 #define ELIMINABLE_REGS                         \
 688  {{ARG_POINTER_REGNUM, STACK_POINTER_REGNUM},   \
 689   {ARG_POINTER_REGNUM, FRAME_POINTER_REGNUM},   \
 690   {FRAME_POINTER_REGNUM, STACK_POINTER_REGNUM}}
 691
 692 /* We need not worry about when the frame-pointer is required for other
 693    reasons; GCC takes care of those cases.  */
 694 #define CAN_ELIMINATE(FROM, TO) 1
 695
 696 #define INITIAL_ELIMINATION_OFFSET(FROM, TO, OFFSET) \
 697  (OFFSET) = mmix_initial_elimination_offset (FROM, TO)
 698
 699
 700 /* Node: Stack Arguments */
 701
 702 #define ACCUMULATE_OUTGOING_ARGS 1
 703
 704 #define RETURN_POPS_ARGS(FUNDECL, FUNTYPE, STACKSIZE) 0
 705
 706
 707 /* Node: Register Arguments */
 708 #define FUNCTION_ARG(CUM, MODE, TYPE, NAMED)    \
 709  mmix_function_arg (&(CUM), MODE, TYPE, NAMED, 0)
 710
 711 #define FUNCTION_INCOMING_ARG(CUM, MODE, TYPE, NAMED)   \
 712  mmix_function_arg (&(CUM), MODE, TYPE, NAMED, 1)
 713
 714 typedef struct { int regs; int lib; } CUMULATIVE_ARGS;
 715
 716 #define INIT_CUMULATIVE_ARGS(CUM, FNTYPE, LIBNAME, INDIRECT, N_NAMED_ARGS) \
 717  ((CUM).regs = 0, (CUM).lib = ((LIBNAME) != 0))
 718
 719 #define FUNCTION_ARG_ADVANCE(CUM, MODE, TYPE, NAMED)            \
 720  ((CUM).regs                                                    \
 721   = ((targetm.calls.must_pass_in_stack (MODE, TYPE))            \
 722      || (MMIX_FUNCTION_ARG_SIZE (MODE, TYPE) > 8                \
 723          && !TARGET_LIBFUNC && !(CUM).lib))                     \
 724   ? (MMIX_MAX_ARGS_IN_REGS) + 1                                 \
 725   : (CUM).regs + (7 + (MMIX_FUNCTION_ARG_SIZE (MODE, TYPE))) / 8)
 726
 727 #define FUNCTION_ARG_REGNO_P(REGNO)             \
 728  mmix_function_arg_regno_p (REGNO, 0)
 729
 730 #define FUNCTION_INCOMING_ARG_REGNO_P(REGNO)            \
 731  mmix_function_arg_regno_p (REGNO, 1)
 732
 733
 734 /* Node: Register Arguments */
 735
 736 #define FUNCTION_VALUE(VALTYPE, FUNC)  \
 737  gen_rtx_REG (TYPE_MODE (VALTYPE), MMIX_RETURN_VALUE_REGNUM)
 738
 739 /* This needs to take care of the register hole for complex return values.  */
 740 #define FUNCTION_OUTGOING_VALUE(VALTYPE, FUNC)  \
 741  mmix_function_outgoing_value (VALTYPE, FUNC)
 742
 743 #define LIBCALL_VALUE(MODE) \
 744  gen_rtx_REG (MODE, MMIX_RETURN_VALUE_REGNUM)
 745
 746 #define FUNCTION_VALUE_REGNO_P(REGNO) \
 747  mmix_function_value_regno_p (REGNO)
 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 /* Node: Profiling */
 767 #define FUNCTION_PROFILER(FILE, LABELNO)        \
 768  mmix_function_profiler (FILE, LABELNO)
 769
 770 /* Node: Trampolines */
 771
 772 #define TRAMPOLINE_TEMPLATE(FILE) \
 773  mmix_trampoline_template (FILE)
 774
 775 #define TRAMPOLINE_SIZE mmix_trampoline_size
 776 #define INITIALIZE_TRAMPOLINE(ADDR, FNADDR, STATIC_CHAIN) \
 777  mmix_initialize_trampoline (ADDR, FNADDR, STATIC_CHAIN)
 778
 779
 780 /* Node: Addressing Modes */
 781
 782 #define CONSTANT_ADDRESS_P(X) \
 783  mmix_constant_address_p (X)
 784
 785 #define MAX_REGS_PER_ADDRESS 2
 786
 787 #define GO_IF_LEGITIMATE_ADDRESS(MODE, X, LABEL)                \
 788  if (mmix_legitimate_address (MODE, X, MMIX_REG_OK_STRICT))     \
 789    goto LABEL
 790
 791 #ifndef REG_OK_STRICT
 792 # define REG_OK_FOR_BASE_P(X)                   \
 793   (REGNO (X) <= MMIX_LAST_GENERAL_REGISTER      \
 794    || REGNO (X) == MMIX_ARG_POINTER_REGNUM      \
 795    || REGNO (X) >= FIRST_PSEUDO_REGISTER)
 796 #else
 797 # define REG_OK_FOR_BASE_P(X) REGNO_OK_FOR_BASE_P (REGNO (X))
 798 #endif /* REG_OK_STRICT */
 799
 800 #define REG_OK_FOR_INDEX_P(X) REG_OK_FOR_BASE_P (X)
 801
 802 #define GO_IF_MODE_DEPENDENT_ADDRESS(ADDR, LABEL)
 803
 804 #define LEGITIMATE_CONSTANT_P(X) \
 805  mmix_legitimate_constant_p (X)
 806
 807
 808 /* Node: Condition Code */
 809
 810 #define SELECT_CC_MODE(OP, X, Y)                \
 811  mmix_select_cc_mode (OP, X, Y)
 812
 813 /* A definition of CANONICALIZE_COMPARISON that changed LE and GT
 814    comparisons with -1 to LT and GE respectively, and LT, LTU, GE or GEU
 815    comparisons with 256 to 255 and LE, LEU, GT and GTU has been
 816    ineffective; the code path for performing the changes did not trig for
 817    neither the GCC testsuite nor ghostscript-6.52 nor Knuth's mmix.tar.gz
 818    itself (core GCC functionality supposedly handling it) with sources
 819    from 2002-06-06.  */
 820
 821 #define REVERSIBLE_CC_MODE(MODE)                \
 822  mmix_reversible_cc_mode (MODE)
 823
 824
 825 /* Node: Costs */
 826
 827 /* The special registers can only move to and from general regs, and we
 828    need to check that their constraints match, so say 3 for them.  */
 829 /* WARNING: gcc-2.7.2.2 i686-pc-linux-gnulibc1 (as shipped with RH 4.2)
 830    miscompiles reload1.c:reload_cse_simplify_set; a call to
 831    reload_cse_regno_equal_p is missing when checking if a substitution of
 832    a register setting is valid if this is defined to just the expression
 833    in mmix_register_move_cost.
 834
 835    Symptom: a (all?) register setting is optimized away for e.g.
 836    "char *p1(char *p) { return p+1; }" and the value of register zero ($0)
 837    is returned.
 838
 839    We can workaround by making this a function call - unknown if this
 840    causes dire speed effects.  */
 841 #define REGISTER_MOVE_COST(MODE, FROM, TO) \
 842  mmix_register_move_cost (MODE, FROM, TO)
 843
 844 #define SLOW_BYTE_ACCESS 0
 845
 846
 847 /* Node: Sections */
 848
 849 /* This must be a constant string, since it's used in crtstuff.c.  */
 850 #define TEXT_SECTION_ASM_OP \
 851  "\t.text ! mmixal:= 9H LOC 8B"
 852
 853 /* FIXME: Not documented.  */
 854 #define DATA_SECTION_ASM_OP \
 855  mmix_data_section_asm_op ()
 856
 857 #define READONLY_DATA_SECTION_ASM_OP    "\t.section\t.rodata"
 858
 859 /* Node: PIC */
 860 /* (empty) */
 861
 862
 863 /* Node: File Framework */
 864
 865 /* While any other punctuation character but ";" would do, we prefer "%"
 866    or "!"; "!" is an unary operator and so will not be mistakenly included
 867    in correctly formed expressions.  The hash character adds mass; catches
 868    the eye.  We can't have it as a comment char by itself, since it's a
 869    hex-number prefix.  */
 870 #define ASM_COMMENT_START "!#"
 871
 872 /* These aren't currently functional.  We just keep them as markers.  */
 873 #define ASM_APP_ON "%APP\n"
 874 #define ASM_APP_OFF "%NO_APP\n"
 875
 876 #define ASM_OUTPUT_SOURCE_FILENAME(STREAM, NAME) \
 877  mmix_asm_output_source_filename (STREAM, NAME)
 878
 879 #define OUTPUT_QUOTED_STRING(STREAM, STRING) \
 880  mmix_output_quoted_string (STREAM, STRING, strlen (STRING))
 881
 882 #define TARGET_ASM_NAMED_SECTION default_elf_asm_named_section
 883
 884 /* Node: Data Output */
 885
 886 #define ASM_OUTPUT_ASCII(STREAM, PTR, LEN) \
 887  mmix_asm_output_ascii (STREAM, PTR, LEN)
 888
 889 /* Node: Uninitialized Data */
 890
 891 #define ASM_OUTPUT_ALIGNED_COMMON(ST, N, S, A) \
 892  mmix_asm_output_aligned_common (ST, N, S, A)
 893
 894 #define ASM_OUTPUT_ALIGNED_LOCAL(ST, N, S, A) \
 895  mmix_asm_output_aligned_local (ST, N, S, A)
 896
 897
 898 /* Node: Label Output */
 899
 900 #define ASM_OUTPUT_LABEL(STREAM, NAME) \
 901  mmix_asm_output_label (STREAM, NAME)
 902
 903 #define ASM_DECLARE_REGISTER_GLOBAL(STREAM, DECL, REGNO, NAME) \
 904  mmix_asm_declare_register_global (STREAM, DECL, REGNO, NAME)
 905
 906 #define GLOBAL_ASM_OP "\t.global "
 907
 908 #define ASM_WEAKEN_LABEL(STREAM, NAME) \
 909  mmix_asm_weaken_label (STREAM, NAME)
 910
 911 #define MAKE_DECL_ONE_ONLY(DECL) \
 912  mmix_make_decl_one_only (DECL)
 913
 914 #define ASM_OUTPUT_LABELREF(STREAM, NAME) \
 915  mmix_asm_output_labelref (STREAM, NAME)
 916
 917 /* We insert a ":" to disambiguate against user symbols like L5.  */
 918 #define ASM_GENERATE_INTERNAL_LABEL(LABEL, PREFIX, NUM) \
 919  sprintf (LABEL, "*%s:%ld", PREFIX, (long)(NUM))
 920
 921 /* Insert "::"; these are rarer than internal labels.  FIXME: Make sure no
 922    ":" is seen in the object file; we don't really want that mmixal
 923    feature visible there.  We don't want the default, which uses a dot;
 924    that'd be incompatible with mmixal.  */
 925 #define ASM_PN_FORMAT "%s::%lu"
 926
 927 #define ASM_OUTPUT_DEF(STREAM, NAME, VALUE) \
 928  mmix_asm_output_def (STREAM, NAME, VALUE)
 929
 930 /* Node: Macros for Initialization */
 931 /* We're compiling to ELF and linking to MMO; fundamental ELF features
 932    that GCC depend on are there.  */
 933
 934 /* These must be constant strings, since they're used in crtstuff.c.  */
 935 #define INIT_SECTION_ASM_OP "\t.section .init,\"ax\" ! mmixal-incompatible"
 936
 937 #define FINI_SECTION_ASM_OP "\t.section .fini,\"ax\" ! mmixal-incompatible"
 938
 939 #define OBJECT_FORMAT_ELF
 940
 941
 942 /* Node: Instruction Output */
 943
 944 /* The non-$ register names must be prefixed with ":", since they're
 945    affected by PREFIX.  We provide the non-colon names as additional
 946    names.  */
 947 #define REGISTER_NAMES                                                  \
 948  {"$0", "$1", "$2", "$3", "$4", "$5", "$6", "$7",                       \
 949   "$8", "$9", "$10", "$11", "$12", "$13", "$14", "$15",                 \
 950   "$16", "$17", "$18", "$19", "$20", "$21", "$22", "$23",               \
 951   "$24", "$25", "$26", "$27", "$28", "$29", "$30", "$31",               \
 952   "$32", "$33", "$34", "$35", "$36", "$37", "$38", "$39",               \
 953   "$40", "$41", "$42", "$43", "$44", "$45", "$46", "$47",               \
 954   "$48", "$49", "$50", "$51", "$52", "$53", "$54", "$55",               \
 955   "$56", "$57", "$58", "$59", "$60", "$61", "$62", "$63",               \
 956   "$64", "$65", "$66", "$67", "$68", "$69", "$70", "$71",               \
 957   "$72", "$73", "$74", "$75", "$76", "$77", "$78", "$79",               \
 958   "$80", "$81", "$82", "$83", "$84", "$85", "$86", "$87",               \
 959   "$88", "$89", "$90", "$91", "$92", "$93", "$94", "$95",               \
 960   "$96", "$97", "$98", "$99", "$100", "$101", "$102", "$103",           \
 961   "$104", "$105", "$106", "$107", "$108", "$109", "$110", "$111",       \
 962   "$112", "$113", "$114", "$115", "$116", "$117", "$118", "$119",       \
 963   "$120", "$121", "$122", "$123", "$124", "$125", "$126", "$127",       \
 964   "$128", "$129", "$130", "$131", "$132", "$133", "$134", "$135",       \
 965   "$136", "$137", "$138", "$139", "$140", "$141", "$142", "$143",       \
 966   "$144", "$145", "$146", "$147", "$148", "$149", "$150", "$151",       \
 967   "$152", "$153", "$154", "$155", "$156", "$157", "$158", "$159",       \
 968   "$160", "$161", "$162", "$163", "$164", "$165", "$166", "$167",       \
 969   "$168", "$169", "$170", "$171", "$172", "$173", "$174", "$175",       \
 970   "$176", "$177", "$178", "$179", "$180", "$181", "$182", "$183",       \
 971   "$184", "$185", "$186", "$187", "$188", "$189", "$190", "$191",       \
 972   "$192", "$193", "$194", "$195", "$196", "$197", "$198", "$199",       \
 973   "$200", "$201", "$202", "$203", "$204", "$205", "$206", "$207",       \
 974   "$208", "$209", "$210", "$211", "$212", "$213", "$214", "$215",       \
 975   "$216", "$217", "$218", "$219", "$220", "$221", "$222", "$223",       \
 976   "$224", "$225", "$226", "$227", "$228", "$229", "$230", "$231",       \
 977   "$232", "$233", "$234", "$235", "$236", "$237", "$238", "$239",       \
 978   "$240", "$241", "$242", "$243", "$244", "$245", "$246", "$247",       \
 979   "$248", "$249", "$250", "$251", "$252", "$253", "$254", "$255",       \
 980   ":rD",  ":rE",  ":rH",  ":rJ",  ":rR",  "ap_!BAD!", ":rO"}
 981
 982 #define ADDITIONAL_REGISTER_NAMES                       \
 983  {{"sp", 254}, {":sp", 254}, {"rD", 256}, {"rE", 257},  \
 984   {"rH", 258}, {"rJ", MMIX_rJ_REGNUM}, {"rO", MMIX_rO_REGNUM}}
 985
 986 #define PRINT_OPERAND(STREAM, X, CODE) \
 987  mmix_print_operand (STREAM, X, CODE)
 988
 989 #define PRINT_OPERAND_PUNCT_VALID_P(CODE) \
 990  mmix_print_operand_punct_valid_p (CODE)
 991
 992 #define PRINT_OPERAND_ADDRESS(STREAM, X) \
 993  mmix_print_operand_address (STREAM, X)
 994
 995 #define ASM_OUTPUT_REG_PUSH(STREAM, REGNO) \
 996  mmix_asm_output_reg_push (STREAM, REGNO)
 997
 998 #define ASM_OUTPUT_REG_POP(STREAM, REGNO) \
 999  mmix_asm_output_reg_pop (STREAM, REGNO)
1000
1001
1002 /* Node: Dispatch Tables */
1003
1004 /* We define both types, since SImode is the better, but DImode the only
1005    possible for mmixal so that's the one actually used.  */
1006 #define ASM_OUTPUT_ADDR_DIFF_ELT(STREAM, BODY, VALUE, REL) \
1007  mmix_asm_output_addr_diff_elt (STREAM, BODY, VALUE, REL)
1008
1009 #define ASM_OUTPUT_ADDR_VEC_ELT(STREAM, VALUE) \
1010  mmix_asm_output_addr_vec_elt (STREAM, VALUE)
1011
1012
1013 /* Node: Exception Region Output */
1014 /* (empty) */
1015
1016 /* Node: Alignment Output */
1017
1018 #define ASM_OUTPUT_SKIP(STREAM, NBYTES) \
1019  mmix_asm_output_skip (STREAM, NBYTES)
1020
1021 #define ASM_OUTPUT_ALIGN(STREAM, POWER) \
1022  mmix_asm_output_align (STREAM, POWER)
1023
1024
1025 /* Node: All Debuggers */
1026
1027 #define DBX_REGISTER_NUMBER(REGNO) \
1028  mmix_dbx_register_number (REGNO)
1029
1030
1031 /* Node: DBX Options */
1032 /* (empty) */
1033 /* Node: DBX Hooks */
1034 /* (empty) */
1035 /* Node: File Names and DBX */
1036 /* (empty) */
1037
1038
1039 /* Node: SDB and DWARF */
1040 #define DWARF2_DEBUGGING_INFO 1
1041 #define DWARF2_ASM_LINE_DEBUG_INFO 1
1042
1043 /* Node: Misc */
1044
1045 #define PREDICATE_CODES                         \
1046  {"mmix_reg_cc_operand", {SUBREG, REG}},        \
1047  {"mmix_foldable_comparison_operator",          \
1048   {NE, EQ, GE, GT, LE, LT}},                    \
1049  /* All '<', actually.  */                      \
1050  {"mmix_comparison_operator",                   \
1051   {NE, EQ, GE, GT, LE, LT, GEU, GTU, LEU,       \
1052    LTU, UNORDERED, ORDERED, UNEQ, UNGE, UNLE,   \
1053    UNLT, LTGT}},                                \
1054  {"mmix_symbolic_or_address_operand",           \
1055   {SYMBOL_REF, LABEL_REF, CONST,                \
1056    SUBREG, REG, PLUS}},                         \
1057  {"mmix_reg_or_constant_operand",               \
1058   {CONST_INT, CONST_DOUBLE, SUBREG, REG}},      \
1059  {"mmix_reg_or_8bit_operand",                   \
1060   {CONST_INT, CONST_DOUBLE, SUBREG, REG}},      \
1061  {"mmix_reg_or_0_operand",                      \
1062   {CONST_INT, CONST_DOUBLE, SUBREG, REG}},
1063
1064 #define SPECIAL_MODE_PREDICATES "mmix_symbolic_or_address_operand",
1065
1066 /* There's no way to get a PC-relative offset into tables for SImode, so
1067    for the moment we have absolute entries in DImode.
1068    When we're going ELF, these should be SImode and 1.  */
1069 #define CASE_VECTOR_MODE DImode
1070 #define CASE_VECTOR_PC_RELATIVE 0
1071
1072 #define WORD_REGISTER_OPERATIONS
1073
1074 /* We have a choice, which makes this yet another parameter to tweak.  The
1075    gut feeling is currently that SIGN_EXTEND wins; "int" is more frequent
1076    than "unsigned int", and we have signed characters.  FIXME: measure.  */
1077 #define LOAD_EXTEND_OP(MODE) (TARGET_ZERO_EXTEND ? ZERO_EXTEND : SIGN_EXTEND)
1078
1079 #define MOVE_MAX 8
1080
1081 #define TRULY_NOOP_TRUNCATION(OUTPREC, INPREC) 1
1082
1083 /* ??? MMIX allows a choice of STORE_FLAG_VALUE.  Revisit later,
1084    we don't have scc expanders yet.  */
1085
1086 #define Pmode DImode
1087
1088 #define FUNCTION_MODE QImode
1089
1090 #define NO_IMPLICIT_EXTERN_C
1091
1092 #define HANDLE_SYSV_PRAGMA 1
1093
1094 /* These are checked.  */
1095 #define DOLLARS_IN_IDENTIFIERS 0
1096 #define NO_DOLLAR_IN_LABEL
1097 #define NO_DOT_IN_LABEL
1098
1099 #endif /* GCC_MMIX_H */
1100 /*
1101  * Local variables:
1102  * eval: (c-set-style "gnu")
1103  * indent-tabs-mode: t
1104  * End:
1105  */