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_REGISTER_FILE_REGNUM 31
  53
  54 /* Four registers; "ideally, these registers should be call-clobbered", so
  55    just grab a bunch of the common clobbered registers.  FIXME: Last
  56    registers of return-value should be used, with an error if there's a
  57    return-value (that collides in size).  */
  58 #define MMIX_EH_RETURN_DATA_REGNO_START (MMIX_STRUCT_VALUE_REGNUM - 4)
  59
  60 /* Try to keep the definitions from running away on their own.  */
  61 #if (MMIX_EH_RETURN_DATA_REGNO_START \
  62      != MMIX_RESERVED_GNU_ARG_0_REGNUM + MMIX_MAX_ARGS_IN_REGS)
  63  #error MMIX register definition inconsistency
  64 #endif
  65
  66 #if (MMIX_MAX_REGS_FOR_VALUE + MMIX_MAX_ARGS_IN_REGS > 32)
  67  #error MMIX parameters and return values bad, more than 32 registers
  68 #endif
  69
  70 /* This chosen as "a call-clobbered hard register that is otherwise
  71    untouched by the epilogue".  */
  72 #define MMIX_EH_RETURN_STACKADJ_REGNUM MMIX_STATIC_CHAIN_REGNUM
  73
  74 #ifdef REG_OK_STRICT
  75 # define MMIX_REG_OK_STRICT 1
  76 #else
  77 # define MMIX_REG_OK_STRICT 0
  78 #endif
  79
  80 #define MMIX_FUNCTION_ARG_SIZE(MODE, TYPE) \
  81  ((MODE) != BLKmode ? GET_MODE_SIZE (MODE) : int_size_in_bytes (TYPE))
  82
  83 /* Declarations for helper variables that are not tied to a particular
  84    target macro.  */
  85 extern struct rtx_def *mmix_compare_op0;
  86 extern struct rtx_def *mmix_compare_op1;
  87
  88 /* Per-function machine data.  This is normally an opaque type just
  89    defined and used in the tm.c file, but we need to see the definition in
  90    mmix.md too.  */
  91 struct machine_function
  92  {
  93    int has_landing_pad;
  94  };
  95
  96 /* For these target macros, there is no generic documentation here.  You
  97    should read `Using and Porting GCC' for that.  Only comments specific
  98    to the MMIX target are here.
  99
 100    There are however references to the specific texinfo node (comments
 101    with "Node:"), so there should be little or nothing amiss.  Probably
 102    the opposite, since we don't have to care about old littering and
 103    soon outdated generic comments.  */
 104
 105 /* Node: Driver */
 106
 107 /* When both ABI:s work, this is how we tell them apart in code.  The
 108    GNU abi is implied the default.  Also implied in TARGET_DEFAULT.  */
 109 #define CPP_SPEC \
 110  "%{mabi=gnu:-D__MMIX_ABI_GNU__\
 111     %{mabi=mmixware:\
 112       %eoptions -mabi=mmixware and -mabi=gnu are mutually exclusive}}\
 113   %{!mabi=gnu:-D__MMIX_ABI_MMIXWARE__}"
 114
 115 /* User symbols are in the same name-space as built-in symbols, but we
 116    don't need the built-in symbols, so remove those and instead apply
 117    stricter operand checking.  Don't warn when expanding insns.  */
 118 #define ASM_SPEC "-no-predefined-syms -x"
 119
 120 /* Pass on -mset-program-start=N and -mset-data-start=M to the linker.
 121    Provide default program start 0x100 unless -mno-set-program-start.
 122    Link to ELF if requested.  */
 123 #define LINK_SPEC \
 124  "%{mset-program-start=*:--defsym __.MMIX.start..text=%*}\
 125   %{mset-data-start=*:--defsym __.MMIX.start..data=%*}\
 126   %{!mset-program-start=*:\
 127     %{!mno-set-program-start:--defsym __.MMIX.start..text=0x100}}\
 128   %{!melf:-m mmo}%{melf:-m elf64mmix}"
 129
 130 /* Put unused option values here.  */
 131 extern const char *mmix_cc1_ignored_option;
 132
 133 #define TARGET_OPTIONS                                  \
 134    {{"set-program-start=", &mmix_cc1_ignored_option,    \
 135   N_("Set start-address of the program") },             \
 136     {"set-data-start=", &mmix_cc1_ignored_option,       \
 137   N_("Set start-address of data")}}
 138
 139 /* FIXME: There's no provision for profiling here.  */
 140 #define STARTFILE_SPEC  \
 141   "crti%O%s crtbegin%O%s"
 142
 143 #define ENDFILE_SPEC "crtend%O%s crtn%O%s"
 144
 145 /* Node: Run-time Target */
 146
 147 /* Define __LONG_MAX__, since we're advised not to change glimits.h.  */
 148 #define CPP_PREDEFINES "-D__mmix__ -D__MMIX__ -D__LONG_MAX__=9223372036854775807L"
 149
 150 extern int target_flags;
 151
 152 #define TARGET_MASK_LIBFUNCS 1
 153 #define TARGET_MASK_ABI_GNU 2
 154 #define TARGET_MASK_FCMP_EPSILON 4
 155 #define TARGET_MASK_ZERO_EXTEND 8
 156 #define TARGET_MASK_KNUTH_DIVISION 16
 157 #define TARGET_MASK_TOPLEVEL_SYMBOLS 32
 158 #define TARGET_MASK_BRANCH_PREDICT 64
 159
 160 /* We use the term "base address" since that's what Knuth uses.  The base
 161    address goes in a global register.  When addressing, it's more like
 162    "base address plus offset", with the offset being 0..255 from the base,
 163    which itself can be a symbol plus an offset.  The effect is like having
 164    a constant pool in global registers, code offseting from those
 165    registers (automatically causing a request for a suitable constant base
 166    address register) without having to know the specific register or the
 167    specific offset.  */
 168 #define TARGET_MASK_BASE_ADDRESSES 128
 169
 170 /* FIXME: Get rid of this one.  */
 171 #define TARGET_LIBFUNC (target_flags & TARGET_MASK_LIBFUNCS)
 172 #define TARGET_ABI_GNU (target_flags & TARGET_MASK_ABI_GNU)
 173 #define TARGET_FCMP_EPSILON (target_flags & TARGET_MASK_FCMP_EPSILON)
 174 #define TARGET_ZERO_EXTEND (target_flags & TARGET_MASK_ZERO_EXTEND)
 175 #define TARGET_KNUTH_DIVISION (target_flags & TARGET_MASK_KNUTH_DIVISION)
 176 #define TARGET_TOPLEVEL_SYMBOLS (target_flags & TARGET_MASK_TOPLEVEL_SYMBOLS)
 177 #define TARGET_BRANCH_PREDICT (target_flags & TARGET_MASK_BRANCH_PREDICT)
 178 #define TARGET_BASE_ADDRESSES (target_flags & TARGET_MASK_BASE_ADDRESSES)
 179
 180 #define TARGET_DEFAULT \
 181  (TARGET_MASK_BRANCH_PREDICT | TARGET_MASK_BASE_ADDRESSES)
 182
 183 /* FIXME: Provide a way to *load* the epsilon register.  */
 184 #define TARGET_SWITCHES                                                 \
 185  {{"libfuncs",          TARGET_MASK_LIBFUNCS,                           \
 186    N_("For intrinsics library: pass all parameters in registers")},     \
 187   {"no-libfuncs",       -TARGET_MASK_LIBFUNCS, ""},                     \
 188   {"abi=mmixware",      -TARGET_MASK_ABI_GNU,                           \
 189    N_("Use register stack for parameters and return value")},           \
 190   {"abi=gnu",           TARGET_MASK_ABI_GNU,                            \
 191    N_("Use call-clobbered registers for parameters and return value")}, \
 192   {"epsilon",           TARGET_MASK_FCMP_EPSILON,                       \
 193    N_("Use epsilon-respecting floating point compare instructions")},   \
 194   {"no-epsilon",        -TARGET_MASK_FCMP_EPSILON, ""},                 \
 195   {"zero-extend",       TARGET_MASK_ZERO_EXTEND,                        \
 196    N_("Use zero-extending memory loads, not sign-extending ones")},     \
 197   {"no-zero-extend",    -TARGET_MASK_ZERO_EXTEND,  ""},                 \
 198   {"knuthdiv",          TARGET_MASK_KNUTH_DIVISION,                     \
 199    N_("Generate divide results with reminder having the same sign as the\
 200  divisor (not the dividend)")},                                         \
 201   {"no-knuthdiv",       -TARGET_MASK_KNUTH_DIVISION, ""},               \
 202   {"toplevel-symbols",  TARGET_MASK_TOPLEVEL_SYMBOLS,                   \
 203    N_("Prepend global symbols with \":\" (for use with PREFIX)")},      \
 204   {"no-toplevel-symbols", -TARGET_MASK_TOPLEVEL_SYMBOLS,                \
 205    N_("Do not provide a default start-address 0x100 of the program")},  \
 206   {"elf", 0,                                                            \
 207    N_("Link to emit program in ELF format (rather than mmo)")},         \
 208   {"branch-predict",    TARGET_MASK_BRANCH_PREDICT,                     \
 209    N_("Use P-mnemonics for branches statically predicted as taken")},   \
 210   {"no-branch-predict", -TARGET_MASK_BRANCH_PREDICT,                    \
 211    N_("Don't use P-mnemonics for branches")},                           \
 212   {"base-addresses",    TARGET_MASK_BASE_ADDRESSES,                     \
 213    N_("Use addresses that allocate global registers")},                 \
 214   {"no-base-addresses", -TARGET_MASK_BASE_ADDRESSES,                    \
 215    N_("Do not use addresses that allocate global registers")},          \
 216   {"",                  TARGET_DEFAULT, ""}}
 217
 218 /* Unfortunately, this must not reference anything in "mmix.c".  */
 219 #define TARGET_VERSION \
 220   fprintf (stderr, " (MMIX)")
 221
 222 #define OVERRIDE_OPTIONS mmix_override_options ()
 223
 224 #define OPTIMIZATION_OPTIONS(LEVEL, SIZE)       \
 225   do                                            \
 226     {                                           \
 227       if (LEVEL >= 1)                           \
 228         flag_regmove = TRUE;                    \
 229                                                 \
 230       if (SIZE || LEVEL > 1)                    \
 231         {                                       \
 232           flag_omit_frame_pointer = TRUE;       \
 233           flag_strength_reduce = FALSE;         \
 234         }                                       \
 235     }                                           \
 236   while (0)
 237
 238 /* This one will have to wait a little bit; right now we can't debug
 239    neither with or without a frame-pointer.  */
 240 /* #define CAN_DEBUG_WITHOUT_FP */
 241
 242
 243 /* Node: Per-Function Data */
 244 #define INIT_EXPANDERS mmix_init_expanders ()
 245
 246
 247 /* Node: Storage Layout */
 248 /* I see no bitfield instructions.  Anyway, the common order is from low
 249    to high, as the power of two, hence little-endian.  */
 250 #define BITS_BIG_ENDIAN 0
 251 #define BYTES_BIG_ENDIAN 1
 252 #define WORDS_BIG_ENDIAN 1
 253 #define FLOAT_WORDS_BIG_ENDIAN 1
 254 #define UNITS_PER_WORD 8
 255 #define POINTER_SIZE 64
 256
 257 /* FIXME: This macro is correlated to MAX_FIXED_MODE_SIZE in that
 258    e.g. this macro must not be 8 (default, UNITS_PER_WORD) when
 259    MAX_FIXED_MODE_SIZE is 64 (default, DImode), or really: this must be
 260    set manually if MAX_FIXED_MODE_SIZE is not at least twice the register
 261    size.  By setting it to 4, we don't have to worry about TImode things
 262    yet.  Revisit, perhaps get TImode going or get some solution that does
 263    not mandate TImode or lie in other ways.  */
 264 #define MIN_UNITS_PER_WORD 4
 265
 266 /* FIXME: Promotion of modes currently generates slow code, extending
 267    before every operation.  */
 268
 269 #define PROMOTE_MODE(MODE, UNSIGNEDP, TYPE)     \
 270  do {                                           \
 271   if (GET_MODE_CLASS (MODE) == MODE_INT         \
 272       && GET_MODE_SIZE (MODE) < 8)              \
 273    {                                            \
 274      (MODE) = DImode;                           \
 275      /* Do the following some time later,       \
 276         scrutinizing differences.  */           \
 277      if (0) (UNSIGNEDP) = 0;                    \
 278    }                                            \
 279  } while (0)
 280
 281 #define PROMOTE_FUNCTION_ARGS
 282
 283 #if 0
 284 /* Apparently not doing TRT if int < register-size.  FIXME: Perhaps
 285    FUNCTION_VALUE and LIBCALL_VALUE needs tweaking as some ports say.  */
 286 #define PROMOTE_FUNCTION_RETURN
 287 #endif
 288
 289 /* I'm a little bit undecided about this one.  It might be beneficial to
 290    promote all operations.  */
 291 #define PROMOTE_FOR_CALL_ONLY
 292
 293 /* We need to align everything to 64 bits that can affect the alignment
 294    of other types.  Since address N is interpreted in MMIX as (N modulo
 295    access_size), we must align.  */
 296 #define PARM_BOUNDARY 64
 297 #define STACK_BOUNDARY 64
 298 #define FUNCTION_BOUNDARY 32
 299 #define BIGGEST_ALIGNMENT 64
 300
 301 /* This one is only used in the ADA front end.  */
 302 #define MINIMUM_ATOMIC_ALIGNMENT 8
 303
 304 /* Copied from elfos.h.  */
 305 #define MAX_OFILE_ALIGNMENT (32768 * 8)
 306
 307 #define DATA_ALIGNMENT(TYPE, BASIC_ALIGN) \
 308  mmix_data_alignment (TYPE, BASIC_ALIGN)
 309
 310 #define CONSTANT_ALIGNMENT(CONSTANT, BASIC_ALIGN) \
 311  mmix_constant_alignment (CONSTANT, BASIC_ALIGN)
 312
 313 #define LOCAL_ALIGNMENT(TYPE, BASIC_ALIGN) \
 314  mmix_local_alignment (TYPE, BASIC_ALIGN)
 315
 316 /* Following other ports, this seems to most commonly be the word-size,
 317    so let's do that here too.  */
 318 #define EMPTY_FIELD_BOUNDARY 64
 319
 320 /* We chose to have this low solely for similarity with the alpha.  It has
 321    nothing to do with passing the tests dg/c99-scope-2 and
 322    execute/align-1.c.  Nothing.  Though the tests seem wrong.  Padding of
 323    the structure is automatically added to get alignment when needed if we
 324    set this to just byte-boundary.  */
 325 #define STRUCTURE_SIZE_BOUNDARY 8
 326
 327 /* The lower bits are ignored.  */
 328 #define STRICT_ALIGNMENT 1
 329
 330
 331 /* Node: Type Layout */
 332
 333 /* It might seem more natural to have 64-bit ints on a 64-bit machine,
 334    but then an occasional MMIX programmer needs to know how to put a lot
 335    of __attribute__ stuff to get to the 8, 16 and 32-bit modes rather
 336    than the "intuitive" char, short and int types.  */
 337 #define INT_TYPE_SIZE 32
 338 #define SHORT_TYPE_SIZE 16
 339 #define LONG_LONG_TYPE_SIZE 64
 340
 341 #define FLOAT_TYPE_SIZE 32
 342 #define DOUBLE_TYPE_SIZE 64
 343 #define LONG_DOUBLE_TYPE_SIZE 64
 344
 345 #define DEFAULT_SIGNED_CHAR 1
 346
 347 /* I have no rationale for this other than pointing at Alpha.  */
 348 #define WCHAR_TYPE "unsigned int"
 349 #define WCHAR_TYPE_SIZE 32
 350
 351
 352 /* Node: Register Basics */
 353 /* We tell GCC about all 256 general registers, and we also include
 354    rD, rE, rH, rJ and rR (in that order) so we can describe what insns
 355    clobber them.  We use a faked register for the argument pointer.  It is
 356    always eliminated towards the frame-pointer or the stack-pointer, never
 357    output in assembly.  Any fixed register would do for this, like $255,
 358    but future debugging is easier when using a separate register.  It
 359    counts as a global register for pseudorandom reasons.  */
 360 #define FIRST_PSEUDO_REGISTER 262
 361
 362 /* We treat general registers with no assigned purpose as fixed.  The
 363    stack pointer, $254, is also fixed.  Register $255 is referred to as a
 364    temporary register in the MMIX papers, and used as such in mmixal, so
 365    it should not be used as a stack pointer.  We set it to fixed, and use
 366    it "manually" at times of despair.  */
 367 #define FIXED_REGISTERS \
 368  { 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, \
 369    0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, \
 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, 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, 0, 0, 0, 0, 0, 0, 0, 1, 1, \
 384    1, 1, 0, 0, 0, 1 \
 385  }
 386
 387 /* General registers are fixed and therefore "historically" marked
 388    call-used.  (FIXME: This has changed).  Registers $15..$31 are
 389    call-clobbered; we'll put arguments in $16 and up, and we need $15 for
 390    the MMIX register-stack "hole".  */
 391 #define CALL_USED_REGISTERS \
 392  { 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 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, 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, 0, 1, 1, \
 408    1, 1, 1, 1, 1, 1 \
 409  }
 410
 411 #define CONDITIONAL_REGISTER_USAGE mmix_conditional_register_usage ()
 412
 413 /* No LOCAL_REGNO, INCOMING_REGNO or OUTGOING_REGNO, since those macros
 414    are not usable for MMIX: it doesn't have a fixed register window size.
 415    FIXME: Perhaps we should say something about $0..$15 may sometimes be
 416    the incoming $16..$31.  Those macros need better documentation; it
 417    looks like they're just bogus and that FUNCTION_INCOMING_ARG_REGNO_P
 418    and FUNCTION_OUTGOING_VALUE should be used where they're used.  For the
 419    moment, do nothing; things seem to work anyway.  */
 420
 421
 422 /* Node: Allocation Order */
 423
 424 /* We should allocate registers from 0 to 31 by increasing number, because
 425    I think that's what people expect.  Beyond that, just use
 426    call-clobbered global registers first, then call-clobbered special
 427    registers.  Last, the fixed registers.  */
 428 #define MMIX_MMIXWARE_ABI_REG_ALLOC_ORDER       \
 429  { 0, 1, 2, 3, 4, 5, 6, 7,                      \
 430    8, 9, 10, 11, 12, 13, 14, 15,                \
 431    16, 17, 18, 19, 20, 21, 22, 23,              \
 432    24, 25, 26, 27, 28, 29, 30, 31,              \
 433                                                 \
 434    252, 251, 250, 249, 248, 247,                \
 435                                                 \
 436    253,                                         \
 437                                                 \
 438    258, 260, 259,                               \
 439                                                 \
 440    32, 33, 34, 35, 36, 37, 38, 39,              \
 441    40, 41, 42, 43, 44, 45, 46, 47,              \
 442    48, 49, 50, 51, 52, 53, 54, 55,              \
 443    56, 57, 58, 59, 60, 61, 62, 63,              \
 444    64, 65, 66, 67, 68, 69, 70, 71,              \
 445    72, 73, 74, 75, 76, 77, 78, 79,              \
 446    80, 81, 82, 83, 84, 85, 86, 87,              \
 447    88, 89, 90, 91, 92, 93, 94, 95,              \
 448    96, 97, 98, 99, 100, 101, 102, 103,          \
 449    104, 105, 106, 107, 108, 109, 110, 111,      \
 450    112, 113, 114, 115, 116, 117, 118, 119,      \
 451    120, 121, 122, 123, 124, 125, 126, 127,      \
 452    128, 129, 130, 131, 132, 133, 134, 135,      \
 453    136, 137, 138, 139, 140, 141, 142, 143,      \
 454    144, 145, 146, 147, 148, 149, 150, 151,      \
 455    152, 153, 154, 155, 156, 157, 158, 159,      \
 456    160, 161, 162, 163, 164, 165, 166, 167,      \
 457    168, 169, 170, 171, 172, 173, 174, 175,      \
 458    176, 177, 178, 179, 180, 181, 182, 183,      \
 459    184, 185, 186, 187, 188, 189, 190, 191,      \
 460    192, 193, 194, 195, 196, 197, 198, 199,      \
 461    200, 201, 202, 203, 204, 205, 206, 207,      \
 462    208, 209, 210, 211, 212, 213, 214, 215,      \
 463    216, 217, 218, 219, 220, 221, 222, 223,      \
 464    224, 225, 226, 227, 228, 229, 230, 231,      \
 465    232, 233, 234, 235, 236, 237, 238, 239,      \
 466    240, 241, 242, 243, 244, 245, 246,           \
 467                                                 \
 468    254, 255, 256, 257, 261                      \
 469  }
 470
 471 /* As a convenience, we put this nearby, for ease of comparison.
 472    First, call-clobbered registers in reverse order of assignment as
 473    parameters (also the top ones; not because they're parameters, but
 474    for continuity).
 475
 476    Second, saved registers that go on the register-stack.
 477
 478    Third, special registers rH, rR and rJ.  They should not normally be
 479    allocated, but since they're call-clobbered, it is cheaper to use one
 480    of them than using a call-saved register for a call-clobbered use,
 481    assuming it is referenced a very limited number of times.  Other global
 482    and fixed registers come next; they are never allocated.  */
 483 #define MMIX_GNU_ABI_REG_ALLOC_ORDER            \
 484 {  252, 251, 250, 249, 248, 247, 246,           \
 485    245, 244, 243, 242, 241, 240, 239, 238,      \
 486    237, 236, 235, 234, 233, 232, 231,           \
 487                                                 \
 488    0, 1, 2, 3, 4, 5, 6, 7,                      \
 489    8, 9, 10, 11, 12, 13, 14, 15,                \
 490    16, 17, 18, 19, 20, 21, 22, 23,              \
 491    24, 25, 26, 27, 28, 29, 30, 31,              \
 492                                                 \
 493    253,                                         \
 494                                                 \
 495    258, 260, 259,                               \
 496                                                 \
 497    32, 33, 34, 35, 36, 37, 38, 39,              \
 498    40, 41, 42, 43, 44, 45, 46, 47,              \
 499    48, 49, 50, 51, 52, 53, 54, 55,              \
 500    56, 57, 58, 59, 60, 61, 62, 63,              \
 501    64, 65, 66, 67, 68, 69, 70, 71,              \
 502    72, 73, 74, 75, 76, 77, 78, 79,              \
 503    80, 81, 82, 83, 84, 85, 86, 87,              \
 504    88, 89, 90, 91, 92, 93, 94, 95,              \
 505    96, 97, 98, 99, 100, 101, 102, 103,          \
 506    104, 105, 106, 107, 108, 109, 110, 111,      \
 507    112, 113, 114, 115, 116, 117, 118, 119,      \
 508    120, 121, 122, 123, 124, 125, 126, 127,      \
 509    128, 129, 130, 131, 132, 133, 134, 135,      \
 510    136, 137, 138, 139, 140, 141, 142, 143,      \
 511    144, 145, 146, 147, 148, 149, 150, 151,      \
 512    152, 153, 154, 155, 156, 157, 158, 159,      \
 513    160, 161, 162, 163, 164, 165, 166, 167,      \
 514    168, 169, 170, 171, 172, 173, 174, 175,      \
 515    176, 177, 178, 179, 180, 181, 182, 183,      \
 516    184, 185, 186, 187, 188, 189, 190, 191,      \
 517    192, 193, 194, 195, 196, 197, 198, 199,      \
 518    200, 201, 202, 203, 204, 205, 206, 207,      \
 519    208, 209, 210, 211, 212, 213, 214, 215,      \
 520    216, 217, 218, 219, 220, 221, 222, 223,      \
 521    224, 225, 226, 227, 228, 229, 230,           \
 522                                                 \
 523    254, 255, 256, 257, 261                      \
 524  }
 525
 526 /* The default one.  */
 527 #define REG_ALLOC_ORDER MMIX_MMIXWARE_ABI_REG_ALLOC_ORDER
 528
 529 /* Node: Values in Registers */
 530
 531 #define HARD_REGNO_NREGS(REGNO, MODE)                   \
 532    ((GET_MODE_SIZE (MODE) + UNITS_PER_WORD - 1)         \
 533     / UNITS_PER_WORD)
 534
 535 #define HARD_REGNO_MODE_OK(REGNO, MODE) 1
 536
 537 /* Note that no register can really be accessed in single-float mode, so
 538    we *can* say 1 here.  FIXME:  Will TRT happen for single-float, or do
 539    we have to punt to libgcc1.asm?  */
 540 #define MODES_TIEABLE_P(MODE1, MODE2) 1
 541
 542
 543 /* Node: Leaf Functions */
 544 /* (empty) */
 545
 546
 547 /* Node: Register Classes */
 548
 549 enum reg_class
 550 {
 551   NO_REGS, GENERAL_REGS, REMAINDER_REG, HIMULT_REG,
 552   SYSTEM_REGS, ALL_REGS, LIM_REG_CLASSES
 553 };
 554
 555 #define N_REG_CLASSES (int) LIM_REG_CLASSES
 556
 557 #define REG_CLASS_NAMES                                         \
 558  {"NO_REGS", "GENERAL_REGS", "REMAINDER_REG", "HIMULT_REG",     \
 559   "SYSTEM_REGS", "ALL_REGS"}
 560
 561 /* Note that the contents of each item is always 32 bits.  */
 562 #define REG_CLASS_CONTENTS                      \
 563  {{0, 0, 0, 0, 0, 0, 0, 0, 0},                  \
 564   {~0, ~0, ~0, ~0, ~0, ~0, ~0, ~0, 0x20},       \
 565   {0, 0, 0, 0, 0, 0, 0, 0, 0x10},               \
 566   {0, 0, 0, 0, 0, 0, 0, 0, 4},                  \
 567   {0, 0, 0, 0, 0, 0, 0, 0, 0x3f},               \
 568   {~0, ~0, ~0, ~0, ~0, ~0, ~0, ~0, 0x3f}}
 569
 570 #define REGNO_REG_CLASS(REGNO)                                  \
 571  ((REGNO) <= MMIX_LAST_GENERAL_REGISTER                         \
 572   || (REGNO) == MMIX_ARG_POINTER_REGNUM                         \
 573   ? GENERAL_REGS                                                \
 574   : (REGNO) == MMIX_REMAINDER_REGNUM ? REMAINDER_REG            \
 575   : (REGNO) == MMIX_HIMULT_REGNUM ? HIMULT_REG : SYSTEM_REGS)
 576
 577 #define BASE_REG_CLASS GENERAL_REGS
 578
 579 #define INDEX_REG_CLASS GENERAL_REGS
 580
 581 #define REG_CLASS_FROM_LETTER(CHAR)             \
 582  ((CHAR) == 'x' ? SYSTEM_REGS                   \
 583   : (CHAR) == 'y' ? REMAINDER_REG               \
 584   : (CHAR) == 'z' ? HIMULT_REG : NO_REGS)
 585
 586 #define REGNO_OK_FOR_BASE_P(REGNO)                              \
 587  ((REGNO) <= MMIX_LAST_GENERAL_REGISTER                         \
 588   || (REGNO) == MMIX_ARG_POINTER_REGNUM                         \
 589   || (reg_renumber[REGNO] > 0                                   \
 590       && reg_renumber[REGNO] <= MMIX_LAST_GENERAL_REGISTER))
 591
 592 #define REGNO_OK_FOR_INDEX_P(REGNO) REGNO_OK_FOR_BASE_P (REGNO)
 593
 594 #define PREFERRED_RELOAD_CLASS(X, CLASS) \
 595  mmix_preferred_reload_class (X, CLASS)
 596
 597 #define PREFERRED_OUTPUT_RELOAD_CLASS(X, CLASS) \
 598  mmix_preferred_output_reload_class (X, CLASS)
 599
 600 #define SECONDARY_INPUT_RELOAD_CLASS(CLASS, MODE, X) \
 601  mmix_secondary_reload_class (CLASS, MODE, X, 1)
 602
 603 #define SECONDARY_OUTPUT_RELOAD_CLASS(CLASS, MODE, X) \
 604  mmix_secondary_reload_class (CLASS, MODE, X, 0)
 605
 606 #define CLASS_MAX_NREGS(CLASS, MODE) HARD_REGNO_NREGS (CLASS, MODE)
 607
 608 #define CONST_OK_FOR_LETTER_P(VALUE, C) \
 609  mmix_const_ok_for_letter_p (VALUE, C)
 610
 611 #define EXTRA_CONSTRAINT(VALUE, C)      \
 612  mmix_extra_constraint (VALUE, C, MMIX_REG_OK_STRICT)
 613
 614 /* Do we need anything serious here?  Yes, any FLOT constant.  */
 615 #define CONST_DOUBLE_OK_FOR_LETTER_P(VALUE, C)                  \
 616  mmix_const_double_ok_for_letter_p (VALUE, C)
 617
 618
 619 /* Node: Frame Layout */
 620
 621 #define STACK_GROWS_DOWNWARD
 622 #define FRAME_GROWS_DOWNWARD
 623
 624 #define STARTING_FRAME_OFFSET \
 625   mmix_starting_frame_offset ()
 626
 627 /* There is a stack slot between the frame-pointer and the first
 628    parameter, where the return address is sometimes stored.  FIXME:
 629    Unnecessary.  */
 630 #define FIRST_PARM_OFFSET(FUNDECL) 8
 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 #define CANONICALIZE_COMPARISON(CODE, OP0, OP1)         \
 864  mmix_canonicalize_comparison (&(CODE), &(OP0), &(OP1));
 865
 866 #define REVERSIBLE_CC_MODE(MODE)                \
 867  mmix_reversible_cc_mode (MODE)
 868
 869
 870 /* Node: Costs */
 871
 872 /* This one takes on both the RTX_COSTS and CONST_COSTS tasks.  */
 873 #define DEFAULT_RTX_COSTS(X, CODE, OUTER_CODE)                  \
 874  {                                                              \
 875    int mmix_rtx_cost;                                           \
 876    if (mmix_rtx_cost_recalculated (X, CODE, OUTER_CODE,         \
 877                                    &mmix_rtx_cost))             \
 878      return mmix_rtx_cost;                                      \
 879  }
 880
 881 #define ADDRESS_COST(ADDRESS) mmix_address_cost (ADDRESS)
 882
 883 /* The special registers can only move to and from general regs, and we
 884    need to check that their constraints match, so say 3 for them.  */
 885 /* WARNING: gcc-2.7.2.2 i686-pc-linux-gnulibc1 (as shipped with RH 4.2)
 886    miscompiles reload1.c:reload_cse_simplify_set; a call to
 887    reload_cse_regno_equal_p is missing when checking if a substitution of
 888    a register setting is valid if this is defined to just the expression
 889    in mmix_register_move_cost.
 890
 891    Symptom: a (all?) register setting is optimized away for e.g.
 892    "char *p1(char *p) { return p+1; }" and the value of register zero ($0)
 893    is returned.
 894
 895    We can workaround by making this a function call - unknown if this
 896    causes dire speed effects.  */
 897 #define REGISTER_MOVE_COST(MODE, FROM, TO) \
 898  mmix_register_move_cost (MODE, FROM, TO)
 899
 900 #define SLOW_BYTE_ACCESS 0
 901
 902
 903 /* Node: Sections */
 904
 905 /* This must be a constant string, since it's used in crtstuff.c.  */
 906 #define TEXT_SECTION_ASM_OP \
 907  "\t.text ! mmixal:= 9H LOC 8B"
 908
 909 /* FIXME: Not documented.  */
 910 #define DATA_SECTION_ASM_OP \
 911  mmix_data_section_asm_op ()
 912
 913 /* Stuff copied from elfos.h.  */
 914 #define EXTRA_SECTIONS in_const
 915
 916 #define EXTRA_SECTION_FUNCTIONS         \
 917   CONST_SECTION_FUNCTION
 918
 919 #define READONLY_DATA_SECTION() const_section ()
 920
 921 #define CONST_SECTION_ASM_OP    "\t.section\t.rodata"
 922
 923 #define CONST_SECTION_FUNCTION                                  \
 924 void                                                            \
 925 const_section ()                                                \
 926 {                                                               \
 927   if (in_section != in_const)                                   \
 928     {                                                           \
 929       fprintf (asm_out_file, "%s\n", CONST_SECTION_ASM_OP);     \
 930       in_section = in_const;                                    \
 931     }                                                           \
 932 }
 933
 934 #undef  SELECT_RTX_SECTION
 935 #define SELECT_RTX_SECTION(MODE, RTX, ALIGN) const_section ()
 936
 937 #define SELECT_SECTION(DECL, RELOC, ALIGN) \
 938  mmix_select_section (DECL, RELOC, ALIGN)
 939
 940 #define ENCODE_SECTION_INFO(DECL) \
 941  mmix_encode_section_info (DECL)
 942
 943 #define STRIP_NAME_ENCODING(VAR, SYM_NAME) \
 944  (VAR) = mmix_strip_name_encoding (SYM_NAME)
 945
 946 #define UNIQUE_SECTION(DECL, RELOC) \
 947   mmix_unique_section (decl, reloc)
 948
 949 /* Node: PIC */
 950 /* (empty) */
 951
 952
 953 /* Node: File Framework */
 954
 955 #define ASM_FILE_START(STREAM) \
 956  mmix_asm_file_start (STREAM)
 957
 958 #define ASM_FILE_END(STREAM) \
 959  mmix_asm_file_end (STREAM)
 960
 961 /* While any other punctuation character but ";" would do, we prefer "%"
 962    or "!"; "!" is an unary operator and so will not be mistakenly included
 963    in correctly formed expressions.  The hash character adds mass; catches
 964    the eye.  We can't have it as a comment char by itself, since it's a
 965    hex-number prefix.  */
 966 #define ASM_COMMENT_START "!#"
 967
 968 /* These aren't currently functional.  We just keep them as markers.  */
 969 #define ASM_APP_ON "%APP\n"
 970 #define ASM_APP_OFF "%NO_APP\n"
 971
 972 #define ASM_OUTPUT_SOURCE_FILENAME(STREAM, NAME) \
 973  mmix_asm_output_source_filename (STREAM, NAME)
 974
 975 #define OUTPUT_QUOTED_STRING(STREAM, STRING) \
 976  mmix_output_quoted_string (STREAM, STRING, strlen (STRING))
 977
 978 #define ASM_OUTPUT_SOURCE_LINE(STREAM, LINE) \
 979  mmix_asm_output_source_line  (STREAM, LINE)
 980
 981 #define TARGET_ASM_NAMED_SECTION default_elf_asm_named_section
 982
 983
 984 /* Node: Data Output */
 985
 986 #define ASM_OUTPUT_ASCII(STREAM, PTR, LEN) \
 987  mmix_asm_output_ascii (STREAM, PTR, LEN)
 988
 989 /* Node: Uninitialized Data */
 990
 991 #define ASM_OUTPUT_ALIGNED_COMMON(ST, N, S, A) \
 992  mmix_asm_output_aligned_common (ST, N, S, A)
 993
 994 #define ASM_OUTPUT_ALIGNED_LOCAL(ST, N, S, A) \
 995  mmix_asm_output_aligned_local (ST, N, S, A)
 996
 997
 998 /* Node: Label Output */
 999
1000 #define ASM_OUTPUT_LABEL(STREAM, NAME) \
1001  mmix_asm_output_label (STREAM, NAME)
1002
1003 #define ASM_DECLARE_REGISTER_GLOBAL(STREAM, DECL, REGNO, NAME) \
1004  mmix_asm_declare_register_global (STREAM, DECL, REGNO, NAME)
1005
1006 #define ASM_GLOBALIZE_LABEL(STREAM, NAME) \
1007  mmix_asm_globalize_label (STREAM, NAME)
1008
1009 #define ASM_WEAKEN_LABEL(STREAM, NAME) \
1010  mmix_asm_weaken_label (STREAM, NAME)
1011
1012 #define MAKE_DECL_ONE_ONLY(DECL) \
1013  mmix_make_decl_one_only (DECL)
1014
1015 #define ASM_OUTPUT_LABELREF(STREAM, NAME) \
1016  mmix_asm_output_labelref (STREAM, NAME)
1017
1018 #define ASM_OUTPUT_INTERNAL_LABEL(STREAM, PREFIX, NUM) \
1019  mmix_asm_output_internal_label (STREAM, PREFIX, NUM)
1020
1021 /* We insert a ":" to disambiguate against user symbols like L5.  */
1022 #define ASM_GENERATE_INTERNAL_LABEL(LABEL, PREFIX, NUM) \
1023  sprintf (LABEL, "*%s:%ld", PREFIX, (long)(NUM))
1024
1025 /* Insert "::"; these are rarer than internal labels.  FIXME: Make sure no
1026    ":" is seen in the object file; we don't really want that mmixal
1027    feature visible there.  We don't want the default, which uses a dot;
1028    that'd be incompatible with mmixal.  */
1029 #define ASM_FORMAT_PRIVATE_NAME(OUTPUT, NAME, LABELNO)          \
1030  ((OUTPUT) = (char *) alloca (strlen ((NAME)) + 2 + 10),        \
1031   sprintf ((OUTPUT), "%s::%d", (NAME), (LABELNO)))
1032
1033 #define ASM_OUTPUT_DEF(STREAM, NAME, VALUE) \
1034  mmix_asm_output_def (STREAM, NAME, VALUE)
1035
1036 #define ASM_OUTPUT_DEFINE_LABEL_DIFFERENCE_SYMBOL(STREAM, SY, HI, LO) \
1037  mmix_asm_output_define_label_difference_symbol (STREAM, SY, HI, LO)
1038
1039
1040 /* Node: Macros for Initialization */
1041 /* We're compiling to ELF and linking to MMO; all ELF features that GCC
1042    care for are there.  FIXME: Are they?  */
1043
1044 /* These must be constant strings, since they're used in crtstuff.c.  */
1045 #define INIT_SECTION_ASM_OP "\t.section .init,\"ax\" ! mmixal-incompatible"
1046
1047 #define FINI_SECTION_ASM_OP "\t.section .fini,\"ax\" ! mmixal-incompatible"
1048
1049 #define OBJECT_FORMAT_ELF
1050
1051
1052 /* Node: Instruction Output */
1053
1054 /* The non-$ register names must be prefixed with ":", since they're
1055    affected by PREFIX.  We provide the non-colon names as additional
1056    names.  */
1057 #define REGISTER_NAMES                                                  \
1058  {"$0", "$1", "$2", "$3", "$4", "$5", "$6", "$7",                       \
1059   "$8", "$9", "$10", "$11", "$12", "$13", "$14", "$15",                 \
1060   "$16", "$17", "$18", "$19", "$20", "$21", "$22", "$23",               \
1061   "$24", "$25", "$26", "$27", "$28", "$29", "$30", "$31",               \
1062   "$32", "$33", "$34", "$35", "$36", "$37", "$38", "$39",               \
1063   "$40", "$41", "$42", "$43", "$44", "$45", "$46", "$47",               \
1064   "$48", "$49", "$50", "$51", "$52", "$53", "$54", "$55",               \
1065   "$56", "$57", "$58", "$59", "$60", "$61", "$62", "$63",               \
1066   "$64", "$65", "$66", "$67", "$68", "$69", "$70", "$71",               \
1067   "$72", "$73", "$74", "$75", "$76", "$77", "$78", "$79",               \
1068   "$80", "$81", "$82", "$83", "$84", "$85", "$86", "$87",               \
1069   "$88", "$89", "$90", "$91", "$92", "$93", "$94", "$95",               \
1070   "$96", "$97", "$98", "$99", "$100", "$101", "$102", "$103",           \
1071   "$104", "$105", "$106", "$107", "$108", "$109", "$110", "$111",       \
1072   "$112", "$113", "$114", "$115", "$116", "$117", "$118", "$119",       \
1073   "$120", "$121", "$122", "$123", "$124", "$125", "$126", "$127",       \
1074   "$128", "$129", "$130", "$131", "$132", "$133", "$134", "$135",       \
1075   "$136", "$137", "$138", "$139", "$140", "$141", "$142", "$143",       \
1076   "$144", "$145", "$146", "$147", "$148", "$149", "$150", "$151",       \
1077   "$152", "$153", "$154", "$155", "$156", "$157", "$158", "$159",       \
1078   "$160", "$161", "$162", "$163", "$164", "$165", "$166", "$167",       \
1079   "$168", "$169", "$170", "$171", "$172", "$173", "$174", "$175",       \
1080   "$176", "$177", "$178", "$179", "$180", "$181", "$182", "$183",       \
1081   "$184", "$185", "$186", "$187", "$188", "$189", "$190", "$191",       \
1082   "$192", "$193", "$194", "$195", "$196", "$197", "$198", "$199",       \
1083   "$200", "$201", "$202", "$203", "$204", "$205", "$206", "$207",       \
1084   "$208", "$209", "$210", "$211", "$212", "$213", "$214", "$215",       \
1085   "$216", "$217", "$218", "$219", "$220", "$221", "$222", "$223",       \
1086   "$224", "$225", "$226", "$227", "$228", "$229", "$230", "$231",       \
1087   "$232", "$233", "$234", "$235", "$236", "$237", "$238", "$239",       \
1088   "$240", "$241", "$242", "$243", "$244", "$245", "$246", "$247",       \
1089   "$248", "$249", "$250", "$251", "$252", "$253", "$254", "$255",       \
1090   ":rD",  ":rE",  ":rH",  ":rJ",  ":rR",  "ap_!BAD!"}
1091
1092 #define ADDITIONAL_REGISTER_NAMES                       \
1093  {{"sp", 254}, {":sp", 254}, {"rD", 256}, {"rE", 257},  \
1094   {"rH", 258}, {"rJ", MMIX_rJ_REGNUM}}
1095
1096 #define PRINT_OPERAND(STREAM, X, CODE) \
1097  mmix_print_operand (STREAM, X, CODE)
1098
1099 #define PRINT_OPERAND_PUNCT_VALID_P(CODE) \
1100  mmix_print_operand_punct_valid_p (CODE)
1101
1102 #define PRINT_OPERAND_ADDRESS(STREAM, X) \
1103  mmix_print_operand_address (STREAM, X)
1104
1105 #if 0
1106 #define USER_LABEL_PREFIX "_"
1107 #endif
1108
1109 #define ASM_OUTPUT_REG_PUSH(STREAM, REGNO) \
1110  mmix_asm_output_reg_push (STREAM, REGNO)
1111
1112 #define ASM_OUTPUT_REG_POP(STREAM, REGNO) \
1113  mmix_asm_output_reg_pop (STREAM, REGNO)
1114
1115
1116 /* Node: Dispatch Tables */
1117
1118 /* We define both types, since SImode is the better, but DImode the only
1119    possible for mmixal so that's the one actually used.  */
1120 #define ASM_OUTPUT_ADDR_DIFF_ELT(STREAM, BODY, VALUE, REL) \
1121  mmix_asm_output_addr_diff_elt (STREAM, BODY, VALUE, REL)
1122
1123 #define ASM_OUTPUT_ADDR_VEC_ELT(STREAM, VALUE) \
1124  mmix_asm_output_addr_vec_elt (STREAM, VALUE)
1125
1126
1127 /* Node: Exception Region Output */
1128 /* (empty) */
1129
1130 /* Node: Alignment Output */
1131
1132 #define ASM_OUTPUT_SKIP(STREAM, NBYTES) \
1133  mmix_asm_output_skip (STREAM, NBYTES)
1134
1135 #define ASM_OUTPUT_ALIGN(STREAM, POWER) \
1136  mmix_asm_output_align (STREAM, POWER)
1137
1138
1139 /* Node: All Debuggers */
1140
1141 #define DBX_REGISTER_NUMBER(REGNO) \
1142  mmix_dbx_register_number (REGNO)
1143
1144
1145 /* Node: DBX Options */
1146 /* (empty) */
1147 /* Node: DBX Hooks */
1148 /* (empty) */
1149 /* Node: File Names and DBX */
1150 /* (empty) */
1151
1152
1153 /* Node: SDB and DWARF */
1154 #define DWARF2_DEBUGGING_INFO
1155 #define DWARF2_ASM_LINE_DEBUG_INFO 1
1156
1157 /* Node: Misc */
1158
1159 #define PREDICATE_CODES                         \
1160  {"mmix_reg_cc_operand", {SUBREG, REG}},        \
1161  {"mmix_foldable_comparison_operator",          \
1162   {NE, EQ, GE, GT, LE, LT}},                    \
1163  /* All '<', actually.  */                      \
1164  {"mmix_comparison_operator",                   \
1165   {NE, EQ, GE, GT, LE, LT, GEU, GTU, LEU,       \
1166    LTU, UNORDERED, ORDERED, UNEQ, UNGE, UNLE,   \
1167    UNLT, LTGT}},                                \
1168  {"mmix_symbolic_or_address_operand",           \
1169   {SYMBOL_REF, LABEL_REF, CONST,                \
1170    SUBREG, REG, PLUS}},                         \
1171  {"mmix_reg_or_constant_operand",               \
1172   {CONST_INT, CONST_DOUBLE, SUBREG, REG}},      \
1173  {"mmix_reg_or_8bit_or_256_operand",            \
1174   {CONST_INT, CONST_DOUBLE, SUBREG, REG}},      \
1175  {"mmix_reg_or_8bit_operand",                   \
1176   {CONST_INT, CONST_DOUBLE, SUBREG, REG}},      \
1177  {"mmix_reg_or_0_operand",                      \
1178   {CONST_INT, CONST_DOUBLE, SUBREG, REG}},
1179
1180 #define SPECIAL_MODE_PREDICATES "mmix_symbolic_or_address_operand",
1181
1182 /* There's no way to get a PC-relative offset into tables for SImode, so
1183    for the moment we have absolute entries in DImode.
1184    When we're going ELF, these should be SImode and 1.  */
1185 #define CASE_VECTOR_MODE DImode
1186 #define CASE_VECTOR_PC_RELATIVE 0
1187
1188 #define WORD_REGISTER_OPERATIONS
1189
1190 /* We have a choice, which makes this yet another parameter to tweak.  The
1191    gut feeling is currently that SIGN_EXTEND wins; "int" is more frequent
1192    than "unsigned int", and we have signed characters.  FIXME: measure.  */
1193 #define LOAD_EXTEND_OP(MODE) (TARGET_ZERO_EXTEND ? ZERO_EXTEND : SIGN_EXTEND)
1194
1195 #define MOVE_MAX 8
1196
1197 #define TRULY_NOOP_TRUNCATION(OUTPREC, INPREC) 1
1198
1199 /* We have a choice here too.  */
1200 #if 0
1201 /* FIXME:  Revisit, we don't have scc expanders yet.  */
1202 #define STORE_FLAG_VALUE 1
1203 #endif
1204
1205 #define Pmode DImode
1206
1207 #define FUNCTION_MODE QImode
1208
1209 /* When in due time we *will* have some specific headers.  */
1210 #define NO_IMPLICIT_EXTERN_C
1211
1212 #define HANDLE_SYSV_PRAGMA
1213
1214 /* These are checked.  */
1215 #define DOLLARS_IN_IDENTIFIERS 0
1216 #define NO_DOLLAR_IN_LABEL
1217 #define NO_DOT_IN_LABEL
1218
1219 #endif /* GCC_MMIX_H */
1220 /*
1221  * Local variables:
1222  * eval: (c-set-style "gnu")
1223  * indent-tabs-mode: t
1224  * End:
1225  */