gcc/config/mmix/mmix.h

   1 /* Definitions of target machine for GNU compiler, for MMIX.
   2    Copyright (C) 2000, 2001, 2002 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 MMIX_rJ_REGNUM
  49 #define MMIX_HIMULT_REGNUM 258
  50 #define MMIX_REMAINDER_REGNUM 260
  51 #define MMIX_ARG_POINTER_REGNUM 261
  52 #define MMIX_LAST_STACK_REGISTER_REGNUM 31
  53
  54 /* Four registers; "ideally, these registers should be call-clobbered", so
  55    just grab a bunch of the common clobbered registers.  FIXME: Last
  56    registers of return-value should be used, with an error if there's a
  57    return-value (that collides in size).  */
  58 #define MMIX_EH_RETURN_DATA_REGNO_START (MMIX_STRUCT_VALUE_REGNUM - 4)
  59
  60 /* Try to keep the definitions from running away on their own.  */
  61 #if (MMIX_EH_RETURN_DATA_REGNO_START \
  62      != MMIX_RESERVED_GNU_ARG_0_REGNUM + MMIX_MAX_ARGS_IN_REGS)
  63  #error MMIX register definition inconsistency
  64 #endif
  65
  66 #if (MMIX_MAX_REGS_FOR_VALUE + MMIX_MAX_ARGS_IN_REGS > 32)
  67  #error MMIX parameters and return values bad, more than 32 registers
  68 #endif
  69
  70 /* This chosen as "a call-clobbered hard register that is otherwise
  71    untouched by the epilogue".  */
  72 #define MMIX_EH_RETURN_STACKADJ_REGNUM MMIX_STATIC_CHAIN_REGNUM
  73
  74 #ifdef REG_OK_STRICT
  75 # define MMIX_REG_OK_STRICT 1
  76 #else
  77 # define MMIX_REG_OK_STRICT 0
  78 #endif
  79
  80 #define MMIX_FUNCTION_ARG_SIZE(MODE, TYPE) \
  81  ((MODE) != BLKmode ? GET_MODE_SIZE (MODE) : int_size_in_bytes (TYPE))
  82
  83 /* Declarations for helper variables that are not tied to a particular
  84    target macro.  */
  85 extern GTY(()) rtx mmix_compare_op0;
  86 extern GTY(()) rtx mmix_compare_op1;
  87
  88 /* Per-function machine data.  This is normally an opaque type just
  89    defined and used in the tm.c file, but we need to see the definition in
  90    mmix.md too.  */
  91 struct machine_function GTY(())
  92  {
  93    int has_landing_pad;
  94    int highest_saved_stack_register;
  95  };
  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 /* User symbols are in the same name-space as built-in symbols, but we
 109    don't need the built-in symbols, so remove those and instead apply
 110    stricter operand checking.  Don't warn when expanding insns.  */
 111 #define ASM_SPEC "-no-predefined-syms -x"
 112
 113 /* Pass on -mset-program-start=N and -mset-data-start=M to the linker.
 114    Provide default program start 0x100 unless -mno-set-program-start.
 115    Don't do this if linking relocatably, with -r.  For a final link,
 116    produce mmo, unless ELF is requested or when linking relocatably.  */
 117 #define LINK_SPEC \
 118  "%{mset-program-start=*:--defsym __.MMIX.start..text=%*}\
 119   %{mset-data-start=*:--defsym __.MMIX.start..data=%*}\
 120   %{!mset-program-start=*:\
 121     %{!mno-set-program-start:\
 122      %{!r:--defsym __.MMIX.start..text=0x100}}}\
 123   %{!melf:%{!r:-m mmo}}%{melf|r:-m elf64mmix}"
 124
 125 /* Put unused option values here.  */
 126 extern const char *mmix_cc1_ignored_option;
 127
 128 #define TARGET_OPTIONS                                  \
 129    {{"set-program-start=", &mmix_cc1_ignored_option,    \
 130   N_("Set start-address of the program") },             \
 131     {"set-data-start=", &mmix_cc1_ignored_option,       \
 132   N_("Set start-address of data")}}
 133
 134 /* FIXME: There's no provision for profiling here.  */
 135 #define STARTFILE_SPEC  \
 136   "crti%O%s crtbegin%O%s"
 137
 138 #define ENDFILE_SPEC "crtend%O%s crtn%O%s"
 139
 140 /* Node: Run-time Target */
 141
 142 /* Define __LONG_MAX__, since we're advised not to change glimits.h.  */
 143 #define TARGET_CPU_CPP_BUILTINS()                               \
 144   do                                                            \
 145     {                                                           \
 146       builtin_define ("__mmix__");                              \
 147       builtin_define ("__MMIX__");                              \
 148       builtin_define ("__LONG_MAX__=9223372036854775807L");     \
 149       if (TARGET_ABI_GNU)                                       \
 150         builtin_define ("__MMIX_ABI_GNU__");                    \
 151       else                                                      \
 152         builtin_define ("__MMIX_ABI_MMIXWARE__");               \
 153     }                                                           \
 154   while (0)
 155
 156 extern int target_flags;
 157
 158 #define TARGET_MASK_LIBFUNCS 1
 159 #define TARGET_MASK_ABI_GNU 2
 160 #define TARGET_MASK_FCMP_EPSILON 4
 161 #define TARGET_MASK_ZERO_EXTEND 8
 162 #define TARGET_MASK_KNUTH_DIVISION 16
 163 #define TARGET_MASK_TOPLEVEL_SYMBOLS 32
 164 #define TARGET_MASK_BRANCH_PREDICT 64
 165
 166 /* We use the term "base address" since that's what Knuth uses.  The base
 167    address goes in a global register.  When addressing, it's more like
 168    "base address plus offset", with the offset being 0..255 from the base,
 169    which itself can be a symbol plus an offset.  The effect is like having
 170    a constant pool in global registers, code offseting from those
 171    registers (automatically causing a request for a suitable constant base
 172    address register) without having to know the specific register or the
 173    specific offset.  The setback is that there's a limited number of
 174    registers, and you'll not find out until link time whether you
 175    should've compiled with -mno-base-addresses.  */
 176 #define TARGET_MASK_BASE_ADDRESSES 128
 177
 178 /* FIXME: Get rid of this one.  */
 179 #define TARGET_LIBFUNC (target_flags & TARGET_MASK_LIBFUNCS)
 180 #define TARGET_ABI_GNU (target_flags & TARGET_MASK_ABI_GNU)
 181 #define TARGET_FCMP_EPSILON (target_flags & TARGET_MASK_FCMP_EPSILON)
 182 #define TARGET_ZERO_EXTEND (target_flags & TARGET_MASK_ZERO_EXTEND)
 183 #define TARGET_KNUTH_DIVISION (target_flags & TARGET_MASK_KNUTH_DIVISION)
 184 #define TARGET_TOPLEVEL_SYMBOLS (target_flags & TARGET_MASK_TOPLEVEL_SYMBOLS)
 185 #define TARGET_BRANCH_PREDICT (target_flags & TARGET_MASK_BRANCH_PREDICT)
 186 #define TARGET_BASE_ADDRESSES (target_flags & TARGET_MASK_BASE_ADDRESSES)
 187
 188 #define TARGET_DEFAULT \
 189  (TARGET_MASK_BRANCH_PREDICT | TARGET_MASK_BASE_ADDRESSES)
 190
 191 /* FIXME: Provide a way to *load* the epsilon register.  */
 192 #define TARGET_SWITCHES                                                 \
 193  {{"libfuncs",          TARGET_MASK_LIBFUNCS,                           \
 194    N_("For intrinsics library: pass all parameters in registers")},     \
 195   {"no-libfuncs",       -TARGET_MASK_LIBFUNCS, ""},                     \
 196   {"abi=mmixware",      -TARGET_MASK_ABI_GNU,                           \
 197    N_("Use register stack for parameters and return value")},           \
 198   {"abi=gnu",           TARGET_MASK_ABI_GNU,                            \
 199    N_("Use call-clobbered registers for parameters and return value")}, \
 200   {"epsilon",           TARGET_MASK_FCMP_EPSILON,                       \
 201    N_("Use epsilon-respecting floating point compare instructions")},   \
 202   {"no-epsilon",        -TARGET_MASK_FCMP_EPSILON, ""},                 \
 203   {"zero-extend",       TARGET_MASK_ZERO_EXTEND,                        \
 204    N_("Use zero-extending memory loads, not sign-extending ones")},     \
 205   {"no-zero-extend",    -TARGET_MASK_ZERO_EXTEND,  ""},                 \
 206   {"knuthdiv",          TARGET_MASK_KNUTH_DIVISION,                     \
 207    N_("Generate divide results with reminder having the same sign as the\
 208  divisor (not the dividend)")},                                         \
 209   {"no-knuthdiv",       -TARGET_MASK_KNUTH_DIVISION, ""},               \
 210   {"toplevel-symbols",  TARGET_MASK_TOPLEVEL_SYMBOLS,                   \
 211    N_("Prepend global symbols with \":\" (for use with PREFIX)")},      \
 212   {"no-toplevel-symbols", -TARGET_MASK_TOPLEVEL_SYMBOLS,                \
 213    N_("Do not provide a default start-address 0x100 of the program")},  \
 214   {"elf", 0,                                                            \
 215    N_("Link to emit program in ELF format (rather than mmo)")},         \
 216   {"branch-predict",    TARGET_MASK_BRANCH_PREDICT,                     \
 217    N_("Use P-mnemonics for branches statically predicted as taken")},   \
 218   {"no-branch-predict", -TARGET_MASK_BRANCH_PREDICT,                    \
 219    N_("Don't use P-mnemonics for branches")},                           \
 220   {"base-addresses",    TARGET_MASK_BASE_ADDRESSES,                     \
 221    N_("Use addresses that allocate global registers")},                 \
 222   {"no-base-addresses", -TARGET_MASK_BASE_ADDRESSES,                    \
 223    N_("Do not use addresses that allocate global registers")},          \
 224   {"",                  TARGET_DEFAULT, ""}}
 225
 226 /* Unfortunately, this must not reference anything in "mmix.c".  */
 227 #define TARGET_VERSION \
 228   fprintf (stderr, " (MMIX)")
 229
 230 #define OVERRIDE_OPTIONS mmix_override_options ()
 231
 232 #define OPTIMIZATION_OPTIONS(LEVEL, SIZE)       \
 233   do                                            \
 234     {                                           \
 235       if (LEVEL >= 1)                           \
 236         flag_regmove = TRUE;                    \
 237                                                 \
 238       if (SIZE || LEVEL > 1)                    \
 239         {                                       \
 240           flag_omit_frame_pointer = TRUE;       \
 241           flag_strength_reduce = FALSE;         \
 242         }                                       \
 243     }                                           \
 244   while (0)
 245
 246 /* This one will have to wait a little bit; right now we can't debug
 247    neither with or without a frame-pointer.  */
 248 /* #define CAN_DEBUG_WITHOUT_FP */
 249
 250
 251 /* Node: Per-Function Data */
 252 #define INIT_EXPANDERS mmix_init_expanders ()
 253
 254
 255 /* Node: Storage Layout */
 256 /* I see no bitfield instructions.  Anyway, the common order is from low
 257    to high, as the power of two, hence little-endian.  */
 258 #define BITS_BIG_ENDIAN 0
 259 #define BYTES_BIG_ENDIAN 1
 260 #define WORDS_BIG_ENDIAN 1
 261 #define FLOAT_WORDS_BIG_ENDIAN 1
 262 #define UNITS_PER_WORD 8
 263
 264 /* FIXME: This macro is correlated to MAX_FIXED_MODE_SIZE in that
 265    e.g. this macro must not be 8 (default, UNITS_PER_WORD) when
 266    MAX_FIXED_MODE_SIZE is 64 (default, DImode), or really: this must be
 267    set manually if MAX_FIXED_MODE_SIZE is not at least twice the register
 268    size.  By setting it to 4, we don't have to worry about TImode things
 269    yet.  Revisit, perhaps get TImode going or get some solution that does
 270    not mandate TImode or lie in other ways.  */
 271 #define MIN_UNITS_PER_WORD 4
 272
 273 /* FIXME: Promotion of modes currently generates slow code, extending
 274    before every operation.  */
 275
 276 #define PROMOTE_MODE(MODE, UNSIGNEDP, TYPE)     \
 277  do {                                           \
 278   if (GET_MODE_CLASS (MODE) == MODE_INT         \
 279       && GET_MODE_SIZE (MODE) < 8)              \
 280    {                                            \
 281      (MODE) = DImode;                           \
 282      /* Do the following some time later,       \
 283         scrutinizing differences.  */           \
 284      if (0) (UNSIGNEDP) = 0;                    \
 285    }                                            \
 286  } while (0)
 287
 288 #define PROMOTE_FUNCTION_ARGS
 289
 290 #if 0
 291 /* Apparently not doing TRT if int < register-size.  FIXME: Perhaps
 292    FUNCTION_VALUE and LIBCALL_VALUE needs tweaking as some ports say.  */
 293 #define PROMOTE_FUNCTION_RETURN
 294 #endif
 295
 296 /* I'm a little bit undecided about this one.  It might be beneficial to
 297    promote all operations.  */
 298 #define PROMOTE_FOR_CALL_ONLY
 299
 300 /* We need to align everything to 64 bits that can affect the alignment
 301    of other types.  Since address N is interpreted in MMIX as (N modulo
 302    access_size), we must align.  */
 303 #define PARM_BOUNDARY 64
 304 #define STACK_BOUNDARY 64
 305 #define FUNCTION_BOUNDARY 32
 306 #define BIGGEST_ALIGNMENT 64
 307
 308 /* This one is only used in the ADA front end.  */
 309 #define MINIMUM_ATOMIC_ALIGNMENT 8
 310
 311 /* Copied from elfos.h.  */
 312 #define MAX_OFILE_ALIGNMENT (32768 * 8)
 313
 314 #define DATA_ALIGNMENT(TYPE, BASIC_ALIGN) \
 315  mmix_data_alignment (TYPE, BASIC_ALIGN)
 316
 317 #define CONSTANT_ALIGNMENT(CONSTANT, BASIC_ALIGN) \
 318  mmix_constant_alignment (CONSTANT, BASIC_ALIGN)
 319
 320 #define LOCAL_ALIGNMENT(TYPE, BASIC_ALIGN) \
 321  mmix_local_alignment (TYPE, BASIC_ALIGN)
 322
 323 /* Following other ports, this seems to most commonly be the word-size,
 324    so let's do that here too.  */
 325 #define EMPTY_FIELD_BOUNDARY 64
 326
 327 /* We chose to have this low solely for similarity with the alpha.  It has
 328    nothing to do with passing the tests dg/c99-scope-2 and
 329    execute/align-1.c.  Nothing.  Though the tests seem wrong.  Padding of
 330    the structure is automatically added to get alignment when needed if we
 331    set this to just byte-boundary.  */
 332 #define STRUCTURE_SIZE_BOUNDARY 8
 333
 334 /* The lower bits are ignored.  */
 335 #define STRICT_ALIGNMENT 1
 336
 337
 338 /* Node: Type Layout */
 339
 340 /* It might seem more natural to have 64-bit ints on a 64-bit machine,
 341    but then an occasional MMIX programmer needs to know how to put a lot
 342    of __attribute__ stuff to get to the 8, 16 and 32-bit modes rather
 343    than the "intuitive" char, short and int types.  */
 344 #define INT_TYPE_SIZE 32
 345 #define SHORT_TYPE_SIZE 16
 346 #define LONG_LONG_TYPE_SIZE 64
 347
 348 #define FLOAT_TYPE_SIZE 32
 349 #define DOUBLE_TYPE_SIZE 64
 350 #define LONG_DOUBLE_TYPE_SIZE 64
 351
 352 #define DEFAULT_SIGNED_CHAR 1
 353
 354
 355 /* Node: Register Basics */
 356 /* We tell GCC about all 256 general registers, and we also include
 357    rD, rE, rH, rJ and rR (in that order) so we can describe what insns
 358    clobber them.  We use a faked register for the argument pointer.  It is
 359    always eliminated towards the frame-pointer or the stack-pointer, never
 360    output in assembly.  Any fixed register would do for this, like $255,
 361    but future debugging is easier when using a separate register.  It
 362    counts as a global register for pseudorandom reasons.  */
 363 #define FIRST_PSEUDO_REGISTER 262
 364
 365 /* We treat general registers with no assigned purpose as fixed.  The
 366    stack pointer, $254, is also fixed.  Register $255 is referred to as a
 367    temporary register in the MMIX papers, and used as such in mmixal, so
 368    it should not be used as a stack pointer.  We set it to fixed, and use
 369    it "manually" at times of despair.  */
 370 #define FIXED_REGISTERS \
 371  { 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, \
 372    0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, \
 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, 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, 0, 0, 0, 0, 0, 0, 0, 1, 1, \
 387    1, 1, 0, 0, 0, 1 \
 388  }
 389
 390 /* General registers are fixed and therefore "historically" marked
 391    call-used.  (FIXME: This has changed).  Registers $15..$31 are
 392    call-clobbered; we'll put arguments in $16 and up, and we need $15 for
 393    the MMIX register-stack "hole".  */
 394 #define CALL_USED_REGISTERS \
 395  { 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 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, 1, 1, 1, \
 400    1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, \
 401    1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, \
 402    1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, \
 403    1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, \
 404    1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, \
 405    1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, \
 406    1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, \
 407    1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, \
 408    1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, \
 409    1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, \
 410    1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 0, 1, 1, \
 411    1, 1, 1, 1, 1, 1 \
 412  }
 413
 414 #define CONDITIONAL_REGISTER_USAGE mmix_conditional_register_usage ()
 415
 416 /* No LOCAL_REGNO, INCOMING_REGNO or OUTGOING_REGNO, since those macros
 417    are not usable for MMIX: it doesn't have a fixed register window size.
 418    FIXME: Perhaps we should say something about $0..$15 may sometimes be
 419    the incoming $16..$31.  Those macros need better documentation; it
 420    looks like they're just bogus and that FUNCTION_INCOMING_ARG_REGNO_P
 421    and FUNCTION_OUTGOING_VALUE should be used where they're used.  For the
 422    moment, do nothing; things seem to work anyway.  */
 423
 424
 425 /* Node: Allocation Order */
 426
 427 /* We should allocate registers from 0 to 31 by increasing number, because
 428    I think that's what people expect.  Beyond that, just use
 429    call-clobbered global registers first, then call-clobbered special
 430    registers.  Last, the fixed registers.  */
 431 #define MMIX_MMIXWARE_ABI_REG_ALLOC_ORDER       \
 432  { 0, 1, 2, 3, 4, 5, 6, 7,                      \
 433    8, 9, 10, 11, 12, 13, 14, 15,                \
 434    16, 17, 18, 19, 20, 21, 22, 23,              \
 435    24, 25, 26, 27, 28, 29, 30, 31,              \
 436                                                 \
 437    252, 251, 250, 249, 248, 247,                \
 438                                                 \
 439    253,                                         \
 440                                                 \
 441    258, 260, 259,                               \
 442                                                 \
 443    32, 33, 34, 35, 36, 37, 38, 39,              \
 444    40, 41, 42, 43, 44, 45, 46, 47,              \
 445    48, 49, 50, 51, 52, 53, 54, 55,              \
 446    56, 57, 58, 59, 60, 61, 62, 63,              \
 447    64, 65, 66, 67, 68, 69, 70, 71,              \
 448    72, 73, 74, 75, 76, 77, 78, 79,              \
 449    80, 81, 82, 83, 84, 85, 86, 87,              \
 450    88, 89, 90, 91, 92, 93, 94, 95,              \
 451    96, 97, 98, 99, 100, 101, 102, 103,          \
 452    104, 105, 106, 107, 108, 109, 110, 111,      \
 453    112, 113, 114, 115, 116, 117, 118, 119,      \
 454    120, 121, 122, 123, 124, 125, 126, 127,      \
 455    128, 129, 130, 131, 132, 133, 134, 135,      \
 456    136, 137, 138, 139, 140, 141, 142, 143,      \
 457    144, 145, 146, 147, 148, 149, 150, 151,      \
 458    152, 153, 154, 155, 156, 157, 158, 159,      \
 459    160, 161, 162, 163, 164, 165, 166, 167,      \
 460    168, 169, 170, 171, 172, 173, 174, 175,      \
 461    176, 177, 178, 179, 180, 181, 182, 183,      \
 462    184, 185, 186, 187, 188, 189, 190, 191,      \
 463    192, 193, 194, 195, 196, 197, 198, 199,      \
 464    200, 201, 202, 203, 204, 205, 206, 207,      \
 465    208, 209, 210, 211, 212, 213, 214, 215,      \
 466    216, 217, 218, 219, 220, 221, 222, 223,      \
 467    224, 225, 226, 227, 228, 229, 230, 231,      \
 468    232, 233, 234, 235, 236, 237, 238, 239,      \
 469    240, 241, 242, 243, 244, 245, 246,           \
 470                                                 \
 471    254, 255, 256, 257, 261                      \
 472  }
 473
 474 /* As a convenience, we put this nearby, for ease of comparison.
 475    First, call-clobbered registers in reverse order of assignment as
 476    parameters (also the top ones; not because they're parameters, but
 477    for continuity).
 478
 479    Second, saved registers that go on the register-stack.
 480
 481    Third, special registers rH, rR and rJ.  They should not normally be
 482    allocated, but since they're call-clobbered, it is cheaper to use one
 483    of them than using a call-saved register for a call-clobbered use,
 484    assuming it is referenced a very limited number of times.  Other global
 485    and fixed registers come next; they are never allocated.  */
 486 #define MMIX_GNU_ABI_REG_ALLOC_ORDER            \
 487  { 252, 251, 250, 249, 248, 247, 246,           \
 488    245, 244, 243, 242, 241, 240, 239, 238,      \
 489    237, 236, 235, 234, 233, 232, 231,           \
 490                                                 \
 491    0, 1, 2, 3, 4, 5, 6, 7,                      \
 492    8, 9, 10, 11, 12, 13, 14, 15,                \
 493    16, 17, 18, 19, 20, 21, 22, 23,              \
 494    24, 25, 26, 27, 28, 29, 30, 31,              \
 495                                                 \
 496    253,                                         \
 497                                                 \
 498    258, 260, 259,                               \
 499                                                 \
 500    32, 33, 34, 35, 36, 37, 38, 39,              \
 501    40, 41, 42, 43, 44, 45, 46, 47,              \
 502    48, 49, 50, 51, 52, 53, 54, 55,              \
 503    56, 57, 58, 59, 60, 61, 62, 63,              \
 504    64, 65, 66, 67, 68, 69, 70, 71,              \
 505    72, 73, 74, 75, 76, 77, 78, 79,              \
 506    80, 81, 82, 83, 84, 85, 86, 87,              \
 507    88, 89, 90, 91, 92, 93, 94, 95,              \
 508    96, 97, 98, 99, 100, 101, 102, 103,          \
 509    104, 105, 106, 107, 108, 109, 110, 111,      \
 510    112, 113, 114, 115, 116, 117, 118, 119,      \
 511    120, 121, 122, 123, 124, 125, 126, 127,      \
 512    128, 129, 130, 131, 132, 133, 134, 135,      \
 513    136, 137, 138, 139, 140, 141, 142, 143,      \
 514    144, 145, 146, 147, 148, 149, 150, 151,      \
 515    152, 153, 154, 155, 156, 157, 158, 159,      \
 516    160, 161, 162, 163, 164, 165, 166, 167,      \
 517    168, 169, 170, 171, 172, 173, 174, 175,      \
 518    176, 177, 178, 179, 180, 181, 182, 183,      \
 519    184, 185, 186, 187, 188, 189, 190, 191,      \
 520    192, 193, 194, 195, 196, 197, 198, 199,      \
 521    200, 201, 202, 203, 204, 205, 206, 207,      \
 522    208, 209, 210, 211, 212, 213, 214, 215,      \
 523    216, 217, 218, 219, 220, 221, 222, 223,      \
 524    224, 225, 226, 227, 228, 229, 230,           \
 525                                                 \
 526    254, 255, 256, 257, 261                      \
 527  }
 528
 529 /* The default one.  */
 530 #define REG_ALLOC_ORDER MMIX_MMIXWARE_ABI_REG_ALLOC_ORDER
 531
 532 /* Node: Values in Registers */
 533
 534 #define HARD_REGNO_NREGS(REGNO, MODE)                   \
 535    ((GET_MODE_SIZE (MODE) + UNITS_PER_WORD - 1)         \
 536     / UNITS_PER_WORD)
 537
 538 #define HARD_REGNO_MODE_OK(REGNO, MODE) 1
 539
 540 /* Note that no register can really be accessed in single-float mode, so
 541    we *can* say 1 here.  FIXME:  Will TRT happen for single-float, or do
 542    we have to punt to libgcc1.asm?  */
 543 #define MODES_TIEABLE_P(MODE1, MODE2) 1
 544
 545
 546 /* Node: Leaf Functions */
 547 /* (empty) */
 548
 549
 550 /* Node: Register Classes */
 551
 552 enum reg_class
 553  {
 554    NO_REGS, GENERAL_REGS, REMAINDER_REG, HIMULT_REG,
 555    SYSTEM_REGS, ALL_REGS, LIM_REG_CLASSES
 556  };
 557
 558 #define N_REG_CLASSES (int) LIM_REG_CLASSES
 559
 560 #define REG_CLASS_NAMES                                         \
 561  {"NO_REGS", "GENERAL_REGS", "REMAINDER_REG", "HIMULT_REG",     \
 562   "SYSTEM_REGS", "ALL_REGS"}
 563
 564 /* Note that the contents of each item is always 32 bits.  */
 565 #define REG_CLASS_CONTENTS                      \
 566  {{0, 0, 0, 0, 0, 0, 0, 0, 0},                  \
 567   {~0, ~0, ~0, ~0, ~0, ~0, ~0, ~0, 0x20},       \
 568   {0, 0, 0, 0, 0, 0, 0, 0, 0x10},               \
 569   {0, 0, 0, 0, 0, 0, 0, 0, 4},                  \
 570   {0, 0, 0, 0, 0, 0, 0, 0, 0x3f},               \
 571   {~0, ~0, ~0, ~0, ~0, ~0, ~0, ~0, 0x3f}}
 572
 573 #define REGNO_REG_CLASS(REGNO)                                  \
 574  ((REGNO) <= MMIX_LAST_GENERAL_REGISTER                         \
 575   || (REGNO) == MMIX_ARG_POINTER_REGNUM                         \
 576   ? GENERAL_REGS                                                \
 577   : (REGNO) == MMIX_REMAINDER_REGNUM ? REMAINDER_REG            \
 578   : (REGNO) == MMIX_HIMULT_REGNUM ? HIMULT_REG : SYSTEM_REGS)
 579
 580 #define BASE_REG_CLASS GENERAL_REGS
 581
 582 #define INDEX_REG_CLASS GENERAL_REGS
 583
 584 #define REG_CLASS_FROM_LETTER(CHAR)             \
 585  ((CHAR) == 'x' ? SYSTEM_REGS                   \
 586   : (CHAR) == 'y' ? REMAINDER_REG               \
 587   : (CHAR) == 'z' ? HIMULT_REG : NO_REGS)
 588
 589 #define REGNO_OK_FOR_BASE_P(REGNO)                              \
 590  ((REGNO) <= MMIX_LAST_GENERAL_REGISTER                         \
 591   || (REGNO) == MMIX_ARG_POINTER_REGNUM                         \
 592   || (reg_renumber[REGNO] > 0                                   \
 593       && reg_renumber[REGNO] <= MMIX_LAST_GENERAL_REGISTER))
 594
 595 #define REGNO_OK_FOR_INDEX_P(REGNO) REGNO_OK_FOR_BASE_P (REGNO)
 596
 597 #define PREFERRED_RELOAD_CLASS(X, CLASS) \
 598  mmix_preferred_reload_class (X, CLASS)
 599
 600 #define PREFERRED_OUTPUT_RELOAD_CLASS(X, CLASS) \
 601  mmix_preferred_output_reload_class (X, CLASS)
 602
 603 #define SECONDARY_INPUT_RELOAD_CLASS(CLASS, MODE, X) \
 604  mmix_secondary_reload_class (CLASS, MODE, X, 1)
 605
 606 #define SECONDARY_OUTPUT_RELOAD_CLASS(CLASS, MODE, X) \
 607  mmix_secondary_reload_class (CLASS, MODE, X, 0)
 608
 609 #define CLASS_MAX_NREGS(CLASS, MODE) HARD_REGNO_NREGS (CLASS, MODE)
 610
 611 #define CONST_OK_FOR_LETTER_P(VALUE, C) \
 612  mmix_const_ok_for_letter_p (VALUE, C)
 613
 614 #define EXTRA_CONSTRAINT(VALUE, C)      \
 615  mmix_extra_constraint (VALUE, C, MMIX_REG_OK_STRICT)
 616
 617 /* Do we need anything serious here?  Yes, any FLOT constant.  */
 618 #define CONST_DOUBLE_OK_FOR_LETTER_P(VALUE, C)                  \
 619  mmix_const_double_ok_for_letter_p (VALUE, C)
 620
 621
 622 /* Node: Frame Layout */
 623
 624 #define STACK_GROWS_DOWNWARD
 625 #define FRAME_GROWS_DOWNWARD
 626
 627 #define STARTING_FRAME_OFFSET \
 628   mmix_starting_frame_offset ()
 629
 630 #define FIRST_PARM_OFFSET(FUNDECL) 0
 631
 632 #define DYNAMIC_CHAIN_ADDRESS(FRAMEADDR) \
 633  mmix_dynamic_chain_address (FRAMEADDR)
 634
 635 /* FIXME: It seems RETURN_ADDR_OFFSET is undocumented.  */
 636
 637 #define SETUP_FRAME_ADDRESSES() \
 638  mmix_setup_frame_addresses ()
 639
 640 #define RETURN_ADDR_RTX(COUNT, FRAME)           \
 641  mmix_return_addr_rtx (COUNT, FRAME)
 642
 643 /* It's in rJ before we store it somewhere.  */
 644 #define INCOMING_RETURN_ADDR_RTX \
 645  gen_rtx_REG (Pmode, MMIX_INCOMING_RETURN_ADDRESS_REGNUM)
 646
 647 /* FIXME: This does not seem properly documented or cross-indexed.
 648    Nowhere except in the code does it say it *has* to be in the range
 649    0..255, or else it will be truncated.  That goes for the default too.  */
 650 #define DWARF_FRAME_RETURN_COLUMN \
 651  DWARF_FRAME_REGNUM (MMIX_INCOMING_RETURN_ADDRESS_REGNUM)
 652
 653 /* No return address is stored there.  */
 654 #define INCOMING_FRAME_SP_OFFSET 0
 655
 656 /* Node: Stack Checking */
 657 /* (empty) */
 658
 659
 660 /* Node: Exception Handling */
 661
 662 #define EH_RETURN_DATA_REGNO(N) \
 663  mmix_eh_return_data_regno (N)
 664
 665 #define EH_RETURN_STACKADJ_RTX \
 666  mmix_eh_return_stackadj_rtx ()
 667
 668 #define EH_RETURN_HANDLER_RTX \
 669  mmix_eh_return_handler_rtx ()
 670
 671 #define ASM_PREFERRED_EH_DATA_FORMAT(CODE, GLOBAL) \
 672  mmix_asm_preferred_eh_data_format (CODE, GLOBAL)
 673
 674 /* Node: Frame Registers */
 675 #define STACK_POINTER_REGNUM MMIX_STACK_POINTER_REGNUM
 676
 677 /* Perhaps we can use HARD_FRAME_POINTER_REGNUM and decide later on
 678    what register we want to use.  */
 679 #define FRAME_POINTER_REGNUM MMIX_FRAME_POINTER_REGNUM
 680 #define ARG_POINTER_REGNUM MMIX_ARG_POINTER_REGNUM
 681
 682 #define STATIC_CHAIN_REGNUM MMIX_STATIC_CHAIN_REGNUM
 683
 684
 685 /* Node: Elimination */
 686 /* FIXME: Is this requirement built-in?  Anyway, we should try to get rid
 687    of it; we can deduce the value.  */
 688 #define FRAME_POINTER_REQUIRED (nonlocal_goto_stack_level != NULL_RTX)
 689
 690 /* The frame-pointer is stored in a location that either counts to the
 691    offset of incoming parameters, or that counts to the offset of the
 692    frame, so we can't use a single offset.  We therefore eliminate those
 693    two separately.  */
 694 #define ELIMINABLE_REGS                         \
 695  {{ARG_POINTER_REGNUM, STACK_POINTER_REGNUM},   \
 696   {ARG_POINTER_REGNUM, FRAME_POINTER_REGNUM},   \
 697   {FRAME_POINTER_REGNUM, STACK_POINTER_REGNUM}}
 698
 699 /* We need not worry about when the frame-pointer is required for other
 700    reasons; GCC takes care of those cases.  */
 701 #define CAN_ELIMINATE(FROM, TO) 1
 702
 703 #define INITIAL_ELIMINATION_OFFSET(FROM, TO, OFFSET) \
 704  (OFFSET) = mmix_initial_elimination_offset (FROM, TO)
 705
 706
 707 /* Node: Stack Arguments */
 708
 709 #define ACCUMULATE_OUTGOING_ARGS 1
 710
 711 #define RETURN_POPS_ARGS(FUNDECL, FUNTYPE, STACKSIZE) 0
 712
 713
 714 /* Node: Register Arguments */
 715 #define FUNCTION_ARG(CUM, MODE, TYPE, NAMED)    \
 716  mmix_function_arg (&(CUM), MODE, TYPE, NAMED, 0)
 717
 718 #define FUNCTION_INCOMING_ARG(CUM, MODE, TYPE, NAMED)   \
 719  mmix_function_arg (&(CUM), MODE, TYPE, NAMED, 1)
 720
 721 #define FUNCTION_ARG_PASS_BY_REFERENCE(CUM, MODE, TYPE, NAMED)  \
 722  mmix_function_arg_pass_by_reference (&(CUM), MODE, TYPE, NAMED)
 723
 724 /* This *sounds* good, but does not seem to be implemented correctly to
 725    be a win; at least it wasn't in 2.7.2.  FIXME: Check and perhaps
 726    replace with a big comment.  */
 727 #define FUNCTION_ARG_CALLEE_COPIES(CUM, MODE, TYPE, NAMED) 1
 728
 729 typedef struct { int regs; int lib; int now_varargs; } CUMULATIVE_ARGS;
 730
 731 #define INIT_CUMULATIVE_ARGS(CUM, FNTYPE, LIBNAME, INDIRECT)    \
 732  ((CUM).regs = 0, (CUM).lib = ((LIBNAME) != 0), (CUM).now_varargs = 0)
 733
 734 #define FUNCTION_ARG_ADVANCE(CUM, MODE, TYPE, NAMED)            \
 735  ((CUM).regs                                                    \
 736   = ((MUST_PASS_IN_STACK (MODE, TYPE))                          \
 737      || (MMIX_FUNCTION_ARG_SIZE (MODE, TYPE) > 8                \
 738          && !TARGET_LIBFUNC && !(CUM).lib))                     \
 739   ? (MMIX_MAX_ARGS_IN_REGS) + 1                                 \
 740   : (CUM).regs + (7 + (MMIX_FUNCTION_ARG_SIZE (MODE, TYPE))) / 8)
 741
 742 #define FUNCTION_ARG_REGNO_P(REGNO)             \
 743  mmix_function_arg_regno_p (REGNO, 0)
 744
 745 #define FUNCTION_INCOMING_ARG_REGNO_P(REGNO)            \
 746  mmix_function_arg_regno_p (REGNO, 1)
 747
 748
 749 /* Node: Register Arguments */
 750
 751 #define FUNCTION_VALUE(VALTYPE, FUNC)  \
 752  gen_rtx_REG (TYPE_MODE (VALTYPE), MMIX_RETURN_VALUE_REGNUM)
 753
 754 /* This needs to take care of the register hole for complex return values.  */
 755 #define FUNCTION_OUTGOING_VALUE(VALTYPE, FUNC)  \
 756  mmix_function_outgoing_value (VALTYPE, FUNC)
 757
 758 #define LIBCALL_VALUE(MODE) \
 759  gen_rtx_REG (MODE, MMIX_OUTGOING_RETURN_VALUE_REGNUM)
 760
 761 #define FUNCTION_VALUE_REGNO_P(REGNO) \
 762  ((REGNO) == MMIX_OUTGOING_RETURN_VALUE_REGNUM)
 763
 764
 765 /* Node: Aggregate Return */
 766
 767 #define STRUCT_VALUE_REGNUM MMIX_STRUCT_VALUE_REGNUM
 768
 769
 770 /* Node: Caller Saves */
 771 /* (empty) */
 772
 773
 774 /* Node: Function Entry */
 775
 776 /* See mmix.c for TARGET_ASM_FUNCTION_PROLOGUE and
 777    TARGET_ASM_FUNCTION_EPILOGUE.  */
 778
 779 /* We need to say that the epilogue uses the return address, so the
 780    initial-value machinery restores it.  FIXME: Some targets
 781    conditionalize on "reload_completed &&".  Investigate difference.
 782    FIXME: Not needed if nonlocal_goto_stack_level.  */
 783 #define EPILOGUE_USES(REGNO) \
 784  ((REGNO) == MMIX_INCOMING_RETURN_ADDRESS_REGNUM)
 785
 786 #define ASM_OUTPUT_MI_THUNK(FILE, THUNK_FNDECL, DELTA, FUNCTION)        \
 787  mmix_asm_output_mi_thunk (FILE, THUNK_FNDECL, DELTA, FUNCTION)
 788
 789
 790 /* Node: Profiling */
 791 #define FUNCTION_PROFILER(FILE, LABELNO)        \
 792  mmix_function_profiler (FILE, LABELNO)
 793
 794 /* Node: Varargs */
 795
 796 /* For the moment, let's stick to pushing argument registers on the stack.
 797    Later, we can parse all arguments in registers, to improve
 798    performance.  */
 799 #define SETUP_INCOMING_VARARGS(A, M, T, P, S)   \
 800  mmix_setup_incoming_varargs(&(A), M, T, &(P), S)
 801
 802 /* FIXME: This and other EXPAND_BUILTIN_VA_... target macros are not
 803    documented, although used by several targets.  */
 804 #define EXPAND_BUILTIN_VA_ARG(VALIST, TYPE) \
 805  mmix_expand_builtin_va_arg (VALIST, TYPE)
 806
 807 /* Node: Trampolines */
 808
 809 #define TRAMPOLINE_TEMPLATE(FILE) \
 810  mmix_trampoline_template (FILE)
 811
 812 #define TRAMPOLINE_SIZE mmix_trampoline_size
 813 #define INITIALIZE_TRAMPOLINE(ADDR, FNADDR, STATIC_CHAIN) \
 814  mmix_initialize_trampoline (ADDR, FNADDR, STATIC_CHAIN)
 815
 816
 817 /* Node: Library Calls */
 818
 819 #define TARGET_MEM_FUNCTIONS
 820
 821
 822 /* Node: Addressing Modes */
 823
 824 #define CONSTANT_ADDRESS_P(X) \
 825  mmix_constant_address_p (X)
 826
 827 #define MAX_REGS_PER_ADDRESS 2
 828
 829 #define GO_IF_LEGITIMATE_ADDRESS(MODE, X, LABEL)                \
 830  if (mmix_legitimate_address (MODE, X, MMIX_REG_OK_STRICT))     \
 831    goto LABEL
 832
 833 #ifndef REG_OK_STRICT
 834 # define REG_OK_FOR_BASE_P(X)                   \
 835   (REGNO (X) <= MMIX_LAST_GENERAL_REGISTER      \
 836    || REGNO (X) == MMIX_ARG_POINTER_REGNUM      \
 837    || REGNO (X) >= FIRST_PSEUDO_REGISTER)
 838 #else
 839 # define REG_OK_FOR_BASE_P(X) REGNO_OK_FOR_BASE_P (REGNO (X))
 840 #endif /* REG_OK_STRICT */
 841
 842 #define REG_OK_FOR_INDEX_P(X) REG_OK_FOR_BASE_P (X)
 843
 844 #define LEGITIMIZE_ADDRESS(X, OLDX, MODE, WIN)
 845
 846 #define GO_IF_MODE_DEPENDENT_ADDRESS(ADDR, LABEL)
 847
 848 #define LEGITIMATE_CONSTANT_P(X) \
 849  mmix_legitimate_constant_p (X)
 850
 851
 852 /* Node: Condition Code */
 853
 854 #define EXTRA_CC_MODES                          \
 855  CC(CC_UNSmode, "CC_UNS")                       \
 856  CC(CC_FPmode, "CC_FP")                         \
 857  CC(CC_FPEQmode, "CC_FPEQ")                     \
 858  CC(CC_FUNmode, "CC_FUN")
 859
 860 #define SELECT_CC_MODE(OP, X, Y)                \
 861  mmix_select_cc_mode (OP, X, Y)
 862
 863 /* A definition of CANONICALIZE_COMPARISON that changed LE and GT
 864    comparisons with -1 to LT and GE respectively, and LT, LTU, GE or GEU
 865    comparisons with 256 to 255 and LE, LEU, GT and GTU has been
 866    ineffective; the code path for performing the changes did not trig for
 867    neither the GCC test-suite nor ghostscript-6.52 nor Knuth's mmix.tar.gz
 868    itself (core GCC functionality supposedly handling it) with sources
 869    from 2002-06-06.  */
 870
 871 #define REVERSIBLE_CC_MODE(MODE)                \
 872  mmix_reversible_cc_mode (MODE)
 873
 874
 875 /* Node: Costs */
 876
 877 /* This one takes on both the RTX_COSTS and CONST_COSTS tasks.  */
 878 #define DEFAULT_RTX_COSTS(X, CODE, OUTER_CODE)                  \
 879  {                                                              \
 880    int mmix_rtx_cost;                                           \
 881    if (mmix_rtx_cost_recalculated (X, CODE, OUTER_CODE,         \
 882                                    &mmix_rtx_cost))             \
 883      return mmix_rtx_cost;                                      \
 884  }
 885
 886 #define ADDRESS_COST(ADDRESS) mmix_address_cost (ADDRESS)
 887
 888 /* The special registers can only move to and from general regs, and we
 889    need to check that their constraints match, so say 3 for them.  */
 890 /* WARNING: gcc-2.7.2.2 i686-pc-linux-gnulibc1 (as shipped with RH 4.2)
 891    miscompiles reload1.c:reload_cse_simplify_set; a call to
 892    reload_cse_regno_equal_p is missing when checking if a substitution of
 893    a register setting is valid if this is defined to just the expression
 894    in mmix_register_move_cost.
 895
 896    Symptom: a (all?) register setting is optimized away for e.g.
 897    "char *p1(char *p) { return p+1; }" and the value of register zero ($0)
 898    is returned.
 899
 900    We can workaround by making this a function call - unknown if this
 901    causes dire speed effects.  */
 902 #define REGISTER_MOVE_COST(MODE, FROM, TO) \
 903  mmix_register_move_cost (MODE, FROM, TO)
 904
 905 #define SLOW_BYTE_ACCESS 0
 906
 907
 908 /* Node: Sections */
 909
 910 /* This must be a constant string, since it's used in crtstuff.c.  */
 911 #define TEXT_SECTION_ASM_OP \
 912  "\t.text ! mmixal:= 9H LOC 8B"
 913
 914 /* FIXME: Not documented.  */
 915 #define DATA_SECTION_ASM_OP \
 916  mmix_data_section_asm_op ()
 917
 918 #define READONLY_DATA_SECTION_ASM_OP    "\t.section\t.rodata"
 919
 920 /* Node: PIC */
 921 /* (empty) */
 922
 923
 924 /* Node: File Framework */
 925
 926 #define ASM_FILE_START(STREAM) \
 927  mmix_asm_file_start (STREAM)
 928
 929 #define ASM_FILE_END(STREAM) \
 930  mmix_asm_file_end (STREAM)
 931
 932 /* While any other punctuation character but ";" would do, we prefer "%"
 933    or "!"; "!" is an unary operator and so will not be mistakenly included
 934    in correctly formed expressions.  The hash character adds mass; catches
 935    the eye.  We can't have it as a comment char by itself, since it's a
 936    hex-number prefix.  */
 937 #define ASM_COMMENT_START "!#"
 938
 939 /* These aren't currently functional.  We just keep them as markers.  */
 940 #define ASM_APP_ON "%APP\n"
 941 #define ASM_APP_OFF "%NO_APP\n"
 942
 943 #define ASM_OUTPUT_SOURCE_FILENAME(STREAM, NAME) \
 944  mmix_asm_output_source_filename (STREAM, NAME)
 945
 946 #define OUTPUT_QUOTED_STRING(STREAM, STRING) \
 947  mmix_output_quoted_string (STREAM, STRING, strlen (STRING))
 948
 949 #define ASM_OUTPUT_SOURCE_LINE(STREAM, LINE) \
 950  mmix_asm_output_source_line  (STREAM, LINE)
 951
 952 #define TARGET_ASM_NAMED_SECTION default_elf_asm_named_section
 953
 954
 955 /* Node: Data Output */
 956
 957 #define ASM_OUTPUT_ASCII(STREAM, PTR, LEN) \
 958  mmix_asm_output_ascii (STREAM, PTR, LEN)
 959
 960 /* Node: Uninitialized Data */
 961
 962 #define ASM_OUTPUT_ALIGNED_COMMON(ST, N, S, A) \
 963  mmix_asm_output_aligned_common (ST, N, S, A)
 964
 965 #define ASM_OUTPUT_ALIGNED_LOCAL(ST, N, S, A) \
 966  mmix_asm_output_aligned_local (ST, N, S, A)
 967
 968
 969 /* Node: Label Output */
 970
 971 #define ASM_OUTPUT_LABEL(STREAM, NAME) \
 972  mmix_asm_output_label (STREAM, NAME)
 973
 974 #define ASM_DECLARE_REGISTER_GLOBAL(STREAM, DECL, REGNO, NAME) \
 975  mmix_asm_declare_register_global (STREAM, DECL, REGNO, NAME)
 976
 977 #define ASM_GLOBALIZE_LABEL(STREAM, NAME) \
 978  mmix_asm_globalize_label (STREAM, NAME)
 979
 980 #define ASM_WEAKEN_LABEL(STREAM, NAME) \
 981  mmix_asm_weaken_label (STREAM, NAME)
 982
 983 #define MAKE_DECL_ONE_ONLY(DECL) \
 984  mmix_make_decl_one_only (DECL)
 985
 986 #define ASM_OUTPUT_LABELREF(STREAM, NAME) \
 987  mmix_asm_output_labelref (STREAM, NAME)
 988
 989 #define ASM_OUTPUT_INTERNAL_LABEL(STREAM, PREFIX, NUM) \
 990  mmix_asm_output_internal_label (STREAM, PREFIX, NUM)
 991
 992 /* We insert a ":" to disambiguate against user symbols like L5.  */
 993 #define ASM_GENERATE_INTERNAL_LABEL(LABEL, PREFIX, NUM) \
 994  sprintf (LABEL, "*%s:%ld", PREFIX, (long)(NUM))
 995
 996 /* Insert "::"; these are rarer than internal labels.  FIXME: Make sure no
 997    ":" is seen in the object file; we don't really want that mmixal
 998    feature visible there.  We don't want the default, which uses a dot;
 999    that'd be incompatible with mmixal.  */
1000 #define ASM_FORMAT_PRIVATE_NAME(OUTPUT, NAME, LABELNO)          \
1001  ((OUTPUT) = (char *) alloca (strlen ((NAME)) + 2 + 10),        \
1002   sprintf ((OUTPUT), "%s::%d", (NAME), (LABELNO)))
1003
1004 #define ASM_OUTPUT_DEF(STREAM, NAME, VALUE) \
1005  mmix_asm_output_def (STREAM, NAME, VALUE)
1006
1007 #define ASM_OUTPUT_DEFINE_LABEL_DIFFERENCE_SYMBOL(STREAM, SY, HI, LO) \
1008  mmix_asm_output_define_label_difference_symbol (STREAM, SY, HI, LO)
1009
1010
1011 /* Node: Macros for Initialization */
1012 /* We're compiling to ELF and linking to MMO; fundamental ELF features
1013    that GCC depend on are there.  */
1014
1015 /* These must be constant strings, since they're used in crtstuff.c.  */
1016 #define INIT_SECTION_ASM_OP "\t.section .init,\"ax\" ! mmixal-incompatible"
1017
1018 #define FINI_SECTION_ASM_OP "\t.section .fini,\"ax\" ! mmixal-incompatible"
1019
1020 #define OBJECT_FORMAT_ELF
1021
1022
1023 /* Node: Instruction Output */
1024
1025 /* The non-$ register names must be prefixed with ":", since they're
1026    affected by PREFIX.  We provide the non-colon names as additional
1027    names.  */
1028 #define REGISTER_NAMES                                                  \
1029  {"$0", "$1", "$2", "$3", "$4", "$5", "$6", "$7",                       \
1030   "$8", "$9", "$10", "$11", "$12", "$13", "$14", "$15",                 \
1031   "$16", "$17", "$18", "$19", "$20", "$21", "$22", "$23",               \
1032   "$24", "$25", "$26", "$27", "$28", "$29", "$30", "$31",               \
1033   "$32", "$33", "$34", "$35", "$36", "$37", "$38", "$39",               \
1034   "$40", "$41", "$42", "$43", "$44", "$45", "$46", "$47",               \
1035   "$48", "$49", "$50", "$51", "$52", "$53", "$54", "$55",               \
1036   "$56", "$57", "$58", "$59", "$60", "$61", "$62", "$63",               \
1037   "$64", "$65", "$66", "$67", "$68", "$69", "$70", "$71",               \
1038   "$72", "$73", "$74", "$75", "$76", "$77", "$78", "$79",               \
1039   "$80", "$81", "$82", "$83", "$84", "$85", "$86", "$87",               \
1040   "$88", "$89", "$90", "$91", "$92", "$93", "$94", "$95",               \
1041   "$96", "$97", "$98", "$99", "$100", "$101", "$102", "$103",           \
1042   "$104", "$105", "$106", "$107", "$108", "$109", "$110", "$111",       \
1043   "$112", "$113", "$114", "$115", "$116", "$117", "$118", "$119",       \
1044   "$120", "$121", "$122", "$123", "$124", "$125", "$126", "$127",       \
1045   "$128", "$129", "$130", "$131", "$132", "$133", "$134", "$135",       \
1046   "$136", "$137", "$138", "$139", "$140", "$141", "$142", "$143",       \
1047   "$144", "$145", "$146", "$147", "$148", "$149", "$150", "$151",       \
1048   "$152", "$153", "$154", "$155", "$156", "$157", "$158", "$159",       \
1049   "$160", "$161", "$162", "$163", "$164", "$165", "$166", "$167",       \
1050   "$168", "$169", "$170", "$171", "$172", "$173", "$174", "$175",       \
1051   "$176", "$177", "$178", "$179", "$180", "$181", "$182", "$183",       \
1052   "$184", "$185", "$186", "$187", "$188", "$189", "$190", "$191",       \
1053   "$192", "$193", "$194", "$195", "$196", "$197", "$198", "$199",       \
1054   "$200", "$201", "$202", "$203", "$204", "$205", "$206", "$207",       \
1055   "$208", "$209", "$210", "$211", "$212", "$213", "$214", "$215",       \
1056   "$216", "$217", "$218", "$219", "$220", "$221", "$222", "$223",       \
1057   "$224", "$225", "$226", "$227", "$228", "$229", "$230", "$231",       \
1058   "$232", "$233", "$234", "$235", "$236", "$237", "$238", "$239",       \
1059   "$240", "$241", "$242", "$243", "$244", "$245", "$246", "$247",       \
1060   "$248", "$249", "$250", "$251", "$252", "$253", "$254", "$255",       \
1061   ":rD",  ":rE",  ":rH",  ":rJ",  ":rR",  "ap_!BAD!"}
1062
1063 #define ADDITIONAL_REGISTER_NAMES                       \
1064  {{"sp", 254}, {":sp", 254}, {"rD", 256}, {"rE", 257},  \
1065   {"rH", 258}, {"rJ", MMIX_rJ_REGNUM}}
1066
1067 #define PRINT_OPERAND(STREAM, X, CODE) \
1068  mmix_print_operand (STREAM, X, CODE)
1069
1070 #define PRINT_OPERAND_PUNCT_VALID_P(CODE) \
1071  mmix_print_operand_punct_valid_p (CODE)
1072
1073 #define PRINT_OPERAND_ADDRESS(STREAM, X) \
1074  mmix_print_operand_address (STREAM, X)
1075
1076 #define ASM_OUTPUT_REG_PUSH(STREAM, REGNO) \
1077  mmix_asm_output_reg_push (STREAM, REGNO)
1078
1079 #define ASM_OUTPUT_REG_POP(STREAM, REGNO) \
1080  mmix_asm_output_reg_pop (STREAM, REGNO)
1081
1082
1083 /* Node: Dispatch Tables */
1084
1085 /* We define both types, since SImode is the better, but DImode the only
1086    possible for mmixal so that's the one actually used.  */
1087 #define ASM_OUTPUT_ADDR_DIFF_ELT(STREAM, BODY, VALUE, REL) \
1088  mmix_asm_output_addr_diff_elt (STREAM, BODY, VALUE, REL)
1089
1090 #define ASM_OUTPUT_ADDR_VEC_ELT(STREAM, VALUE) \
1091  mmix_asm_output_addr_vec_elt (STREAM, VALUE)
1092
1093
1094 /* Node: Exception Region Output */
1095 /* (empty) */
1096
1097 /* Node: Alignment Output */
1098
1099 #define ASM_OUTPUT_SKIP(STREAM, NBYTES) \
1100  mmix_asm_output_skip (STREAM, NBYTES)
1101
1102 #define ASM_OUTPUT_ALIGN(STREAM, POWER) \
1103  mmix_asm_output_align (STREAM, POWER)
1104
1105
1106 /* Node: All Debuggers */
1107
1108 #define DBX_REGISTER_NUMBER(REGNO) \
1109  mmix_dbx_register_number (REGNO)
1110
1111
1112 /* Node: DBX Options */
1113 /* (empty) */
1114 /* Node: DBX Hooks */
1115 /* (empty) */
1116 /* Node: File Names and DBX */
1117 /* (empty) */
1118
1119
1120 /* Node: SDB and DWARF */
1121 #define DWARF2_DEBUGGING_INFO
1122 #define DWARF2_ASM_LINE_DEBUG_INFO 1
1123
1124 /* Node: Misc */
1125
1126 #define PREDICATE_CODES                         \
1127  {"mmix_reg_cc_operand", {SUBREG, REG}},        \
1128  {"mmix_foldable_comparison_operator",          \
1129   {NE, EQ, GE, GT, LE, LT}},                    \
1130  /* All '<', actually.  */                      \
1131  {"mmix_comparison_operator",                   \
1132   {NE, EQ, GE, GT, LE, LT, GEU, GTU, LEU,       \
1133    LTU, UNORDERED, ORDERED, UNEQ, UNGE, UNLE,   \
1134    UNLT, LTGT}},                                \
1135  {"mmix_symbolic_or_address_operand",           \
1136   {SYMBOL_REF, LABEL_REF, CONST,                \
1137    SUBREG, REG, PLUS}},                         \
1138  {"mmix_reg_or_constant_operand",               \
1139   {CONST_INT, CONST_DOUBLE, SUBREG, REG}},      \
1140  {"mmix_reg_or_8bit_operand",                   \
1141   {CONST_INT, CONST_DOUBLE, SUBREG, REG}},      \
1142  {"mmix_reg_or_0_operand",                      \
1143   {CONST_INT, CONST_DOUBLE, SUBREG, REG}},
1144
1145 #define SPECIAL_MODE_PREDICATES "mmix_symbolic_or_address_operand",
1146
1147 /* There's no way to get a PC-relative offset into tables for SImode, so
1148    for the moment we have absolute entries in DImode.
1149    When we're going ELF, these should be SImode and 1.  */
1150 #define CASE_VECTOR_MODE DImode
1151 #define CASE_VECTOR_PC_RELATIVE 0
1152
1153 #define WORD_REGISTER_OPERATIONS
1154
1155 /* We have a choice, which makes this yet another parameter to tweak.  The
1156    gut feeling is currently that SIGN_EXTEND wins; "int" is more frequent
1157    than "unsigned int", and we have signed characters.  FIXME: measure.  */
1158 #define LOAD_EXTEND_OP(MODE) (TARGET_ZERO_EXTEND ? ZERO_EXTEND : SIGN_EXTEND)
1159
1160 #define MOVE_MAX 8
1161
1162 #define TRULY_NOOP_TRUNCATION(OUTPREC, INPREC) 1
1163
1164 /* We have a choice here too.  */
1165 #if 0
1166 /* FIXME:  Revisit, we don't have scc expanders yet.  */
1167 #define STORE_FLAG_VALUE 1
1168 #endif
1169
1170 #define Pmode DImode
1171
1172 #define FUNCTION_MODE QImode
1173
1174 #define NO_IMPLICIT_EXTERN_C
1175
1176 #define HANDLE_SYSV_PRAGMA
1177
1178 /* These are checked.  */
1179 #define DOLLARS_IN_IDENTIFIERS 0
1180 #define NO_DOLLAR_IN_LABEL
1181 #define NO_DOT_IN_LABEL
1182
1183 /* Calculate the highest used supposed saved stack register.  */
1184 #define MACHINE_DEPENDENT_REORG(INSN) \
1185  mmix_machine_dependent_reorg (INSN)
1186
1187 #endif /* GCC_MMIX_H */
1188 /*
1189  * Local variables:
1190  * eval: (c-set-style "gnu")
1191  * indent-tabs-mode: t
1192  * End:
1193  */