gcc/config/mmix/mmix.h

   1 /* Definitions of target machine for GNU compiler, for MMIX.
   2    Copyright (C) 2000-2017 Free Software Foundation, Inc.
   3    Contributed by Hans-Peter Nilsson (hp@bitrange.com)
   4
   5 This file is part of GCC.
   6
   7 GCC is free software; you can redistribute it and/or modify
   8 it under the terms of the GNU General Public License as published by
   9 the Free Software Foundation; either version 3, or (at your option)
  10 any later version.
  11
  12 GCC is distributed in the hope that it will be useful,
  13 but WITHOUT ANY WARRANTY; without even the implied warranty of
  14 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  15 GNU General Public License for more details.
  16
  17 You should have received a copy of the GNU General Public License
  18 along with GCC; see the file COPYING3.  If not see
  19 <http://www.gnu.org/licenses/>.  */
  20
  21 #ifndef GCC_MMIX_H
  22 #define GCC_MMIX_H
  23
  24 /* First, some local helper macros.  Note that the "default" value of
  25    FIXED_REGISTERS, CALL_USED_REGISTERS, REG_ALLOC_ORDER and
  26    REG_CLASS_CONTENTS depend on these values.  */
  27 #define MMIX_RESERVED_GNU_ARG_0_REGNUM 231
  28 #define MMIX_FIRST_ARG_REGNUM \
  29   (TARGET_ABI_GNU ? MMIX_RESERVED_GNU_ARG_0_REGNUM : 16)
  30 #define MMIX_FIRST_INCOMING_ARG_REGNUM \
  31   (TARGET_ABI_GNU ? MMIX_RESERVED_GNU_ARG_0_REGNUM : 0)
  32 #define MMIX_MAX_ARGS_IN_REGS 16
  33
  34 /* FIXME: This one isn't fully implemented yet.  Return values larger than
  35    one register are passed by reference in MMIX_STRUCT_VALUE_REGNUM by the
  36    caller, except for return values of type "complex".  */
  37 #define MMIX_MAX_REGS_FOR_VALUE 16
  38 #define MMIX_RETURN_VALUE_REGNUM \
  39   (TARGET_ABI_GNU ? MMIX_RESERVED_GNU_ARG_0_REGNUM : 15)
  40 #define MMIX_OUTGOING_RETURN_VALUE_REGNUM \
  41   (TARGET_ABI_GNU ? MMIX_RESERVED_GNU_ARG_0_REGNUM : 0)
  42 #define MMIX_STRUCT_VALUE_REGNUM 251
  43 #define MMIX_STATIC_CHAIN_REGNUM 252
  44 #define MMIX_FRAME_POINTER_REGNUM 253
  45 #define MMIX_STACK_POINTER_REGNUM 254
  46 #define MMIX_LAST_GENERAL_REGISTER 255
  47 #define MMIX_INCOMING_RETURN_ADDRESS_REGNUM MMIX_rJ_REGNUM
  48 #define MMIX_HIMULT_REGNUM 258
  49 #define MMIX_REMAINDER_REGNUM MMIX_rR_REGNUM
  50 #define MMIX_ARG_POINTER_REGNUM 261
  51 #define MMIX_rO_REGNUM 262
  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 #define MMIX_FUNCTION_ARG_SIZE(MODE, TYPE) \
  75  ((MODE) != BLKmode ? GET_MODE_SIZE (MODE) : int_size_in_bytes (TYPE))
  76
  77 /* Per-function machine data.  This is normally an opaque type just
  78    defined and used in the tm.c file, but we need to see the definition in
  79    mmix.md too.  */
  80 struct GTY(()) machine_function
  81  {
  82    int has_landing_pad;
  83    int highest_saved_stack_register;
  84    int in_prologue;
  85  };
  86
  87 /* For these target macros, there is no generic documentation here.  You
  88    should read `Using and Porting GCC' for that.  Only comments specific
  89    to the MMIX target are here.
  90
  91    There are however references to the specific texinfo node (comments
  92    with "Node:"), so there should be little or nothing amiss.  Probably
  93    the opposite, since we don't have to care about old littering and
  94    soon outdated generic comments.  */
  95
  96 /* Node: Driver */
  97
  98 /* User symbols are in the same name-space as built-in symbols, but we
  99    don't need the built-in symbols, so remove those and instead apply
 100    stricter operand checking.  Don't warn when expanding insns.  */
 101 #define ASM_SPEC "-no-predefined-syms -x"
 102
 103 /* Pass on -mset-program-start=N and -mset-data-start=M to the linker.
 104    Provide default program start 0x100 unless -mno-set-program-start.
 105    Don't do this if linking relocatably, with -r.  For a final link,
 106    produce mmo, unless ELF is requested or when linking relocatably.  */
 107 #define LINK_SPEC \
 108  "%{mset-program-start=*:--defsym __.MMIX.start..text=%*}\
 109   %{mset-data-start=*:--defsym __.MMIX.start..data=%*}\
 110   %{!mset-program-start=*:\
 111     %{!mno-set-program-start:\
 112      %{!r:--defsym __.MMIX.start..text=0x100}}}\
 113   %{!melf:%{!r:-m mmo}}%{melf|r:-m elf64mmix}"
 114
 115 /* FIXME: There's no provision for profiling here.  */
 116 #define STARTFILE_SPEC  \
 117   "crti%O%s crtbegin%O%s"
 118
 119 #define ENDFILE_SPEC "crtend%O%s crtn%O%s"
 120
 121 /* Node: Run-time Target */
 122
 123 /* Define __LONG_MAX__, since we're advised not to change glimits.h.  */
 124 #define TARGET_CPU_CPP_BUILTINS()                               \
 125   do                                                            \
 126     {                                                           \
 127       builtin_define ("__mmix__");                              \
 128       builtin_define ("__MMIX__");                              \
 129       if (TARGET_ABI_GNU)                                       \
 130         builtin_define ("__MMIX_ABI_GNU__");                    \
 131       else                                                      \
 132         builtin_define ("__MMIX_ABI_MMIXWARE__");               \
 133     }                                                           \
 134   while (0)
 135
 136 #define TARGET_DEFAULT \
 137  (MASK_BRANCH_PREDICT | MASK_BASE_ADDRESSES | MASK_USE_RETURN_INSN)
 138
 139
 140 /* Node: Per-Function Data */
 141 #define INIT_EXPANDERS mmix_init_expanders ()
 142
 143
 144 /* Node: Storage Layout */
 145 /* I see no bit-field instructions.  Anyway, the common order is from low
 146    to high, as the power of two, hence little-endian.  */
 147 #define BITS_BIG_ENDIAN 0
 148 #define BYTES_BIG_ENDIAN 1
 149 #define WORDS_BIG_ENDIAN 1
 150 #define FLOAT_WORDS_BIG_ENDIAN 1
 151 #define UNITS_PER_WORD 8
 152
 153 /* We need to align everything to 64 bits that can affect the alignment
 154    of other types.  Since address N is interpreted in MMIX as (N modulo
 155    access_size), we must align.  */
 156 #define PARM_BOUNDARY 64
 157 #define STACK_BOUNDARY 64
 158 #define FUNCTION_BOUNDARY 32
 159 #define BIGGEST_ALIGNMENT 64
 160
 161 /* This one is only used in the ADA front end.  */
 162 #define MINIMUM_ATOMIC_ALIGNMENT 8
 163
 164 /* Copied from elfos.h.  */
 165 #define MAX_OFILE_ALIGNMENT (32768 * 8)
 166
 167 #define DATA_ABI_ALIGNMENT(TYPE, BASIC_ALIGN) \
 168  mmix_data_alignment (TYPE, BASIC_ALIGN)
 169
 170 #define CONSTANT_ALIGNMENT(CONSTANT, BASIC_ALIGN) \
 171  mmix_constant_alignment (CONSTANT, BASIC_ALIGN)
 172
 173 #define LOCAL_ALIGNMENT(TYPE, BASIC_ALIGN) \
 174  mmix_local_alignment (TYPE, BASIC_ALIGN)
 175
 176 /* Following other ports, this seems to most commonly be the word-size,
 177    so let's do that here too.  */
 178 #define EMPTY_FIELD_BOUNDARY 64
 179
 180 /* We chose to have this low solely for similarity with the alpha.  It has
 181    nothing to do with passing the tests dg/c99-scope-2 and
 182    execute/align-1.c.  Nothing.  Though the tests seem wrong.  Padding of
 183    the structure is automatically added to get alignment when needed if we
 184    set this to just byte-boundary.  */
 185 #define STRUCTURE_SIZE_BOUNDARY 8
 186
 187 /* The lower bits are ignored.  */
 188 #define STRICT_ALIGNMENT 1
 189
 190
 191 /* Node: Type Layout */
 192
 193 /* It might seem more natural to have 64-bit ints on a 64-bit machine,
 194    but then an occasional MMIX programmer needs to know how to put a lot
 195    of __attribute__ stuff to get to the 8, 16 and 32-bit modes rather
 196    than the "intuitive" char, short and int types.  */
 197 #define INT_TYPE_SIZE 32
 198 #define SHORT_TYPE_SIZE 16
 199 #define LONG_LONG_TYPE_SIZE 64
 200
 201 #define FLOAT_TYPE_SIZE 32
 202 #define DOUBLE_TYPE_SIZE 64
 203 #define LONG_DOUBLE_TYPE_SIZE 64
 204
 205 #define DEFAULT_SIGNED_CHAR 1
 206
 207
 208 /* Node: Register Basics */
 209 /* We tell GCC about all 256 general registers, and we also include
 210    rD, rE, rH, rJ, rR and rO (in that order) so we can describe what insns
 211    clobber them.  We use a faked register for the argument pointer.  It is
 212    always eliminated towards the frame-pointer or the stack-pointer, never
 213    output in assembly.  Any fixed register would do for this, like $255,
 214    but future debugging is easier when using a separate register.  It
 215    counts as a global register for pseudorandom reasons.  */
 216 #define FIRST_PSEUDO_REGISTER 263
 217
 218 /* We treat general registers with no assigned purpose as fixed.  The
 219    stack pointer, $254, is also fixed.  Register $255 is referred to as a
 220    temporary register in the MMIX papers, and used as such in mmixal, so
 221    it should not be used as a stack pointer.  We set it to fixed, and use
 222    it "manually" at times of despair.  */
 223 #define FIXED_REGISTERS \
 224  { 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, \
 225    0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, \
 226    1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, \
 227    1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, \
 228    1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, \
 229    1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, \
 230    1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, \
 231    1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, \
 232    1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, \
 233    1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, \
 234    1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, \
 235    1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, \
 236    1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, \
 237    1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, \
 238    1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, \
 239    1, 1, 1, 1, 1, 1, 1, 0, 0, 0, 0, 0, 0, 0, 1, 1, \
 240    1, 1, 0, 0, 0, 1, 1 \
 241  }
 242
 243 /* General registers are fixed and therefore "historically" marked
 244    call-used.  (FIXME: This has changed).  Registers $15..$31 are
 245    call-clobbered; we'll put arguments in $16 and up, and we need $15 for
 246    the MMIX register-stack "hole".  */
 247 #define CALL_USED_REGISTERS \
 248  { 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 1, \
 249    1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, \
 250    1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, \
 251    1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, \
 252    1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, \
 253    1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, \
 254    1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, \
 255    1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, \
 256    1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, \
 257    1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, \
 258    1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, \
 259    1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, \
 260    1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, \
 261    1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, \
 262    1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, \
 263    1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 0, 1, 1, \
 264    1, 1, 1, 1, 1, 1, 1 \
 265  }
 266
 267 #define INCOMING_REGNO(OUT) mmix_opposite_regno (OUT, 0)
 268
 269 #define OUTGOING_REGNO(IN) mmix_opposite_regno (IN, 1)
 270
 271 /* Defining LOCAL_REGNO is necessary in presence of prologue/epilogue,
 272    else GCC will be confused that those registers aren't saved and
 273    restored.  */
 274 #define LOCAL_REGNO(REGNO) mmix_local_regno (REGNO)
 275
 276 /* Node: Allocation Order */
 277
 278 /* We should allocate registers from 0 to 31 by increasing number, because
 279    I think that's what people expect.  Beyond that, just use
 280    call-clobbered global registers first, then call-clobbered special
 281    registers.  Last, the fixed registers.  */
 282 #define MMIX_MMIXWARE_ABI_REG_ALLOC_ORDER       \
 283  { 0, 1, 2, 3, 4, 5, 6, 7,                      \
 284    8, 9, 10, 11, 12, 13, 14, 15,                \
 285    16, 17, 18, 19, 20, 21, 22, 23,              \
 286    24, 25, 26, 27, 28, 29, 30, 31,              \
 287                                                 \
 288    252, 251, 250, 249, 248, 247,                \
 289                                                 \
 290    253,                                         \
 291                                                 \
 292    258, 260, 259,                               \
 293                                                 \
 294    32, 33, 34, 35, 36, 37, 38, 39,              \
 295    40, 41, 42, 43, 44, 45, 46, 47,              \
 296    48, 49, 50, 51, 52, 53, 54, 55,              \
 297    56, 57, 58, 59, 60, 61, 62, 63,              \
 298    64, 65, 66, 67, 68, 69, 70, 71,              \
 299    72, 73, 74, 75, 76, 77, 78, 79,              \
 300    80, 81, 82, 83, 84, 85, 86, 87,              \
 301    88, 89, 90, 91, 92, 93, 94, 95,              \
 302    96, 97, 98, 99, 100, 101, 102, 103,          \
 303    104, 105, 106, 107, 108, 109, 110, 111,      \
 304    112, 113, 114, 115, 116, 117, 118, 119,      \
 305    120, 121, 122, 123, 124, 125, 126, 127,      \
 306    128, 129, 130, 131, 132, 133, 134, 135,      \
 307    136, 137, 138, 139, 140, 141, 142, 143,      \
 308    144, 145, 146, 147, 148, 149, 150, 151,      \
 309    152, 153, 154, 155, 156, 157, 158, 159,      \
 310    160, 161, 162, 163, 164, 165, 166, 167,      \
 311    168, 169, 170, 171, 172, 173, 174, 175,      \
 312    176, 177, 178, 179, 180, 181, 182, 183,      \
 313    184, 185, 186, 187, 188, 189, 190, 191,      \
 314    192, 193, 194, 195, 196, 197, 198, 199,      \
 315    200, 201, 202, 203, 204, 205, 206, 207,      \
 316    208, 209, 210, 211, 212, 213, 214, 215,      \
 317    216, 217, 218, 219, 220, 221, 222, 223,      \
 318    224, 225, 226, 227, 228, 229, 230, 231,      \
 319    232, 233, 234, 235, 236, 237, 238, 239,      \
 320    240, 241, 242, 243, 244, 245, 246,           \
 321                                                 \
 322    254, 255, 256, 257, 261, 262                 \
 323  }
 324
 325 /* As a convenience, we put this nearby, for ease of comparison.
 326    First, call-clobbered registers in reverse order of assignment as
 327    parameters (also the top ones; not because they're parameters, but
 328    for continuity).
 329
 330    Second, saved registers that go on the register-stack.
 331
 332    Third, special registers rH, rR and rJ.  They should not normally be
 333    allocated, but since they're call-clobbered, it is cheaper to use one
 334    of them than using a call-saved register for a call-clobbered use,
 335    assuming it is referenced a very limited number of times.  Other global
 336    and fixed registers come next; they are never allocated.  */
 337 #define MMIX_GNU_ABI_REG_ALLOC_ORDER            \
 338  { 252, 251, 250, 249, 248, 247, 246,           \
 339    245, 244, 243, 242, 241, 240, 239, 238,      \
 340    237, 236, 235, 234, 233, 232, 231,           \
 341                                                 \
 342    0, 1, 2, 3, 4, 5, 6, 7,                      \
 343    8, 9, 10, 11, 12, 13, 14, 15,                \
 344    16, 17, 18, 19, 20, 21, 22, 23,              \
 345    24, 25, 26, 27, 28, 29, 30, 31,              \
 346                                                 \
 347    253,                                         \
 348                                                 \
 349    258, 260, 259,                               \
 350                                                 \
 351    32, 33, 34, 35, 36, 37, 38, 39,              \
 352    40, 41, 42, 43, 44, 45, 46, 47,              \
 353    48, 49, 50, 51, 52, 53, 54, 55,              \
 354    56, 57, 58, 59, 60, 61, 62, 63,              \
 355    64, 65, 66, 67, 68, 69, 70, 71,              \
 356    72, 73, 74, 75, 76, 77, 78, 79,              \
 357    80, 81, 82, 83, 84, 85, 86, 87,              \
 358    88, 89, 90, 91, 92, 93, 94, 95,              \
 359    96, 97, 98, 99, 100, 101, 102, 103,          \
 360    104, 105, 106, 107, 108, 109, 110, 111,      \
 361    112, 113, 114, 115, 116, 117, 118, 119,      \
 362    120, 121, 122, 123, 124, 125, 126, 127,      \
 363    128, 129, 130, 131, 132, 133, 134, 135,      \
 364    136, 137, 138, 139, 140, 141, 142, 143,      \
 365    144, 145, 146, 147, 148, 149, 150, 151,      \
 366    152, 153, 154, 155, 156, 157, 158, 159,      \
 367    160, 161, 162, 163, 164, 165, 166, 167,      \
 368    168, 169, 170, 171, 172, 173, 174, 175,      \
 369    176, 177, 178, 179, 180, 181, 182, 183,      \
 370    184, 185, 186, 187, 188, 189, 190, 191,      \
 371    192, 193, 194, 195, 196, 197, 198, 199,      \
 372    200, 201, 202, 203, 204, 205, 206, 207,      \
 373    208, 209, 210, 211, 212, 213, 214, 215,      \
 374    216, 217, 218, 219, 220, 221, 222, 223,      \
 375    224, 225, 226, 227, 228, 229, 230,           \
 376                                                 \
 377    254, 255, 256, 257, 261, 262                 \
 378  }
 379
 380 /* The default one.  */
 381 #define REG_ALLOC_ORDER MMIX_MMIXWARE_ABI_REG_ALLOC_ORDER
 382
 383 /* Node: Leaf Functions */
 384 /* (empty) */
 385
 386
 387 /* Node: Register Classes */
 388
 389 enum reg_class
 390  {
 391    NO_REGS, GENERAL_REGS, REMAINDER_REG, HIMULT_REG,
 392    SYSTEM_REGS, ALL_REGS, LIM_REG_CLASSES
 393  };
 394
 395 #define N_REG_CLASSES (int) LIM_REG_CLASSES
 396
 397 #define REG_CLASS_NAMES                                         \
 398  {"NO_REGS", "GENERAL_REGS", "REMAINDER_REG", "HIMULT_REG",     \
 399   "SYSTEM_REGS", "ALL_REGS"}
 400
 401 /* Note that the contents of each item is always 32 bits.  */
 402 #define REG_CLASS_CONTENTS                      \
 403  {{0, 0, 0, 0, 0, 0, 0, 0, 0},                  \
 404   {~0, ~0, ~0, ~0, ~0, ~0, ~0, ~0, 0x20},       \
 405   {0, 0, 0, 0, 0, 0, 0, 0, 0x10},               \
 406   {0, 0, 0, 0, 0, 0, 0, 0, 4},                  \
 407   {0, 0, 0, 0, 0, 0, 0, 0, 0x7f},               \
 408   {~0, ~0, ~0, ~0, ~0, ~0, ~0, ~0, 0x7f}}
 409
 410 #define REGNO_REG_CLASS(REGNO)                                  \
 411  ((REGNO) <= MMIX_LAST_GENERAL_REGISTER                         \
 412   || (REGNO) == MMIX_ARG_POINTER_REGNUM                         \
 413   ? GENERAL_REGS                                                \
 414   : (REGNO) == MMIX_REMAINDER_REGNUM ? REMAINDER_REG            \
 415   : (REGNO) == MMIX_HIMULT_REGNUM ? HIMULT_REG : SYSTEM_REGS)
 416
 417 #define BASE_REG_CLASS GENERAL_REGS
 418
 419 #define INDEX_REG_CLASS GENERAL_REGS
 420
 421 #define REGNO_OK_FOR_BASE_P(REGNO)                              \
 422  ((REGNO) <= MMIX_LAST_GENERAL_REGISTER                         \
 423   || (REGNO) == MMIX_ARG_POINTER_REGNUM                         \
 424   || (reg_renumber[REGNO] > 0                                   \
 425       && reg_renumber[REGNO] <= MMIX_LAST_GENERAL_REGISTER))
 426
 427 #define REGNO_OK_FOR_INDEX_P(REGNO) REGNO_OK_FOR_BASE_P (REGNO)
 428
 429 #define SECONDARY_INPUT_RELOAD_CLASS(CLASS, MODE, X) \
 430  mmix_secondary_reload_class (CLASS, MODE, X, 1)
 431
 432 #define SECONDARY_OUTPUT_RELOAD_CLASS(CLASS, MODE, X) \
 433  mmix_secondary_reload_class (CLASS, MODE, X, 0)
 434
 435 #define CLASS_MAX_NREGS(CLASS, MODE) targetm.hard_regno_nregs (CLASS, MODE)
 436
 437
 438 /* Node: Frame Layout */
 439
 440 #define STACK_GROWS_DOWNWARD 1
 441 #define FRAME_GROWS_DOWNWARD 1
 442
 443 #define STARTING_FRAME_OFFSET \
 444   mmix_starting_frame_offset ()
 445
 446 #define FIRST_PARM_OFFSET(FUNDECL) 0
 447
 448 #define DYNAMIC_CHAIN_ADDRESS(FRAMEADDR) \
 449  mmix_dynamic_chain_address (FRAMEADDR)
 450
 451 /* FIXME: It seems RETURN_ADDR_OFFSET is undocumented.  */
 452
 453 #define SETUP_FRAME_ADDRESSES() \
 454  mmix_setup_frame_addresses ()
 455
 456 #define RETURN_ADDR_RTX(COUNT, FRAME)           \
 457  mmix_return_addr_rtx (COUNT, FRAME)
 458
 459 /* It's in rJ before we store it somewhere.  */
 460 #define INCOMING_RETURN_ADDR_RTX \
 461  gen_rtx_REG (Pmode, MMIX_INCOMING_RETURN_ADDRESS_REGNUM)
 462
 463 /* FIXME: This does not seem properly documented or cross-indexed.
 464    Nowhere except in the code does it say it *has* to be in the range
 465    0..255, or else it will be truncated.  That goes for the default too.  */
 466 #define DWARF_FRAME_RETURN_COLUMN \
 467  DWARF_FRAME_REGNUM (MMIX_INCOMING_RETURN_ADDRESS_REGNUM)
 468
 469 /* No return address is stored there.  */
 470 #define INCOMING_FRAME_SP_OFFSET 0
 471
 472 /* Node: Stack Checking */
 473 /* (empty) */
 474
 475
 476 /* Node: Exception Handling */
 477
 478 #define EH_RETURN_DATA_REGNO(N) \
 479  mmix_eh_return_data_regno (N)
 480
 481 #define EH_RETURN_STACKADJ_RTX \
 482  mmix_eh_return_stackadj_rtx ()
 483
 484 #define EH_RETURN_HANDLER_RTX \
 485  mmix_eh_return_handler_rtx ()
 486
 487 #define ASM_PREFERRED_EH_DATA_FORMAT(CODE, GLOBAL) \
 488  mmix_asm_preferred_eh_data_format (CODE, GLOBAL)
 489
 490 /* Node: Frame Registers */
 491 #define STACK_POINTER_REGNUM MMIX_STACK_POINTER_REGNUM
 492
 493 /* Perhaps we can use HARD_FRAME_POINTER_REGNUM and decide later on
 494    what register we want to use.  */
 495 #define FRAME_POINTER_REGNUM MMIX_FRAME_POINTER_REGNUM
 496 #define ARG_POINTER_REGNUM MMIX_ARG_POINTER_REGNUM
 497
 498 #define STATIC_CHAIN_REGNUM MMIX_STATIC_CHAIN_REGNUM
 499
 500
 501 /* Node: Elimination */
 502
 503 /* The frame-pointer is stored in a location that either counts to the
 504    offset of incoming parameters, or that counts to the offset of the
 505    frame, so we can't use a single offset.  We therefore eliminate those
 506    two separately.  */
 507 #define ELIMINABLE_REGS                         \
 508  {{ARG_POINTER_REGNUM, STACK_POINTER_REGNUM},   \
 509   {ARG_POINTER_REGNUM, FRAME_POINTER_REGNUM},   \
 510   {FRAME_POINTER_REGNUM, STACK_POINTER_REGNUM}}
 511
 512 #define INITIAL_ELIMINATION_OFFSET(FROM, TO, OFFSET) \
 513  (OFFSET) = mmix_initial_elimination_offset (FROM, TO)
 514
 515
 516 /* Node: Stack Arguments */
 517
 518 #define ACCUMULATE_OUTGOING_ARGS 1
 519
 520
 521 /* Node: Register Arguments */
 522
 523 typedef struct { int regs; int lib; } CUMULATIVE_ARGS;
 524
 525 #define INIT_CUMULATIVE_ARGS(CUM, FNTYPE, LIBNAME, INDIRECT, N_NAMED_ARGS) \
 526  ((CUM).regs = 0, (CUM).lib = ((LIBNAME) != 0))
 527
 528 #define FUNCTION_ARG_REGNO_P(REGNO)             \
 529  mmix_function_arg_regno_p (REGNO, 0)
 530
 531
 532 /* Node: Caller Saves */
 533 /* (empty) */
 534
 535
 536 /* Node: Function Entry */
 537
 538 /* See mmix.c for TARGET_ASM_FUNCTION_PROLOGUE and
 539    TARGET_ASM_FUNCTION_EPILOGUE.  */
 540
 541 /* We need to say that the epilogue uses the return address, so the
 542    initial-value machinery restores it.  FIXME: Some targets
 543    conditionalize on "reload_completed &&".  Investigate difference.
 544    FIXME: Not needed if nonlocal_goto_stack_level.  */
 545 #define EPILOGUE_USES(REGNO) \
 546  ((REGNO) == MMIX_INCOMING_RETURN_ADDRESS_REGNUM)
 547
 548 /* Node: Profiling */
 549 #define FUNCTION_PROFILER(FILE, LABELNO)        \
 550  mmix_function_profiler (FILE, LABELNO)
 551
 552 /* Node: Trampolines */
 553
 554 #define TRAMPOLINE_SIZE         (4*UNITS_PER_WORD)
 555 #define TRAMPOLINE_ALIGNMENT    BITS_PER_WORD
 556
 557 /* Node: Addressing Modes */
 558
 559 #define CONSTANT_ADDRESS_P(X) \
 560  mmix_constant_address_p (X)
 561
 562 #define MAX_REGS_PER_ADDRESS 2
 563
 564
 565 /* Node: Condition Code */
 566
 567 #define SELECT_CC_MODE(OP, X, Y)                \
 568  mmix_select_cc_mode (OP, X, Y)
 569
 570 /* A definition of CANONICALIZE_COMPARISON that changed LE and GT
 571    comparisons with -1 to LT and GE respectively, and LT, LTU, GE or GEU
 572    comparisons with 256 to 255 and LE, LEU, GT and GTU has been
 573    ineffective; the code path for performing the changes did not trig for
 574    neither the GCC testsuite nor ghostscript-6.52 nor Knuth's mmix.tar.gz
 575    itself (core GCC functionality supposedly handling it) with sources
 576    from 2002-06-06.  */
 577
 578 #define REVERSIBLE_CC_MODE(MODE)                \
 579  mmix_reversible_cc_mode (MODE)
 580
 581
 582 /* Node: Costs */
 583
 584 #define SLOW_BYTE_ACCESS 0
 585
 586
 587 /* Node: Sections */
 588
 589 /* This must be a constant string, since it's used in crtstuff.c.  */
 590 #define TEXT_SECTION_ASM_OP \
 591  "\t.text ! mmixal:= 9H LOC 8B"
 592
 593 /* FIXME: Not documented.  */
 594 #define DATA_SECTION_ASM_OP \
 595  mmix_data_section_asm_op ()
 596
 597 #define READONLY_DATA_SECTION_ASM_OP    "\t.section\t.rodata"
 598
 599 /* Node: PIC */
 600 /* (empty) */
 601
 602
 603 /* Node: File Framework */
 604
 605 /* While any other punctuation character but ";" would do, we prefer "%"
 606    or "!"; "!" is an unary operator and so will not be mistakenly included
 607    in correctly formed expressions.  The hash character adds mass; catches
 608    the eye.  We can't have it as a comment char by itself, since it's a
 609    hex-number prefix.  */
 610 #define ASM_COMMENT_START "!#"
 611
 612 /* These aren't currently functional.  We just keep them as markers.  */
 613 #define ASM_APP_ON "%APP\n"
 614 #define ASM_APP_OFF "%NO_APP\n"
 615
 616 #define OUTPUT_QUOTED_STRING(STREAM, STRING) \
 617  mmix_output_quoted_string (STREAM, STRING, strlen (STRING))
 618
 619 #define TARGET_ASM_NAMED_SECTION default_elf_asm_named_section
 620
 621 /* Node: Data Output */
 622
 623 #define ASM_OUTPUT_ASCII(STREAM, PTR, LEN) \
 624  mmix_asm_output_ascii (STREAM, PTR, LEN)
 625
 626 /* Node: Uninitialized Data */
 627
 628 #define ASM_OUTPUT_ALIGNED_COMMON(ST, N, S, A) \
 629  mmix_asm_output_aligned_common (ST, N, S, A)
 630
 631 #define ASM_OUTPUT_ALIGNED_LOCAL(ST, N, S, A) \
 632  mmix_asm_output_aligned_local (ST, N, S, A)
 633
 634
 635 /* Node: Label Output */
 636
 637 #define ASM_OUTPUT_LABEL(STREAM, NAME) \
 638  mmix_asm_output_label (STREAM, NAME)
 639
 640 #define ASM_OUTPUT_INTERNAL_LABEL(STREAM, NAME) \
 641  mmix_asm_output_internal_label (STREAM, NAME)
 642
 643 #define ASM_DECLARE_REGISTER_GLOBAL(STREAM, DECL, REGNO, NAME) \
 644  mmix_asm_declare_register_global (STREAM, DECL, REGNO, NAME)
 645
 646 #define GLOBAL_ASM_OP "\t.global "
 647
 648 #define ASM_WEAKEN_LABEL(STREAM, NAME) \
 649  mmix_asm_weaken_label (STREAM, NAME)
 650
 651 #define MAKE_DECL_ONE_ONLY(DECL) \
 652  mmix_make_decl_one_only (DECL)
 653
 654 #define ASM_OUTPUT_LABELREF(STREAM, NAME) \
 655  mmix_asm_output_labelref (STREAM, NAME)
 656
 657 /* We insert a ":" to disambiguate against user symbols like L5.  */
 658 #define ASM_GENERATE_INTERNAL_LABEL(LABEL, PREFIX, NUM) \
 659  sprintf (LABEL, "*%s:%ld", PREFIX, (long)(NUM))
 660
 661 /* Insert "::"; these are rarer than internal labels.  FIXME: Make sure no
 662    ":" is seen in the object file; we don't really want that mmixal
 663    feature visible there.  We don't want the default, which uses a dot;
 664    that'd be incompatible with mmixal.  */
 665 #define ASM_PN_FORMAT "%s::%lu"
 666
 667 #define ASM_OUTPUT_DEF(STREAM, NAME, VALUE) \
 668  mmix_asm_output_def (STREAM, NAME, VALUE)
 669
 670 /* Node: Macros for Initialization */
 671 /* We're compiling to ELF and linking to MMO; fundamental ELF features
 672    that GCC depend on are there.  */
 673
 674 /* These must be constant strings, since they're used in crtstuff.c.  */
 675 #define INIT_SECTION_ASM_OP "\t.section .init,\"ax\" ! mmixal-incompatible"
 676
 677 #define FINI_SECTION_ASM_OP "\t.section .fini,\"ax\" ! mmixal-incompatible"
 678
 679 #define OBJECT_FORMAT_ELF
 680
 681
 682 /* Node: Instruction Output */
 683
 684 /* The non-$ register names must be prefixed with ":", since they're
 685    affected by PREFIX.  We provide the non-colon names as additional
 686    names.  */
 687 #define REGISTER_NAMES                                                  \
 688  {"$0", "$1", "$2", "$3", "$4", "$5", "$6", "$7",                       \
 689   "$8", "$9", "$10", "$11", "$12", "$13", "$14", "$15",                 \
 690   "$16", "$17", "$18", "$19", "$20", "$21", "$22", "$23",               \
 691   "$24", "$25", "$26", "$27", "$28", "$29", "$30", "$31",               \
 692   "$32", "$33", "$34", "$35", "$36", "$37", "$38", "$39",               \
 693   "$40", "$41", "$42", "$43", "$44", "$45", "$46", "$47",               \
 694   "$48", "$49", "$50", "$51", "$52", "$53", "$54", "$55",               \
 695   "$56", "$57", "$58", "$59", "$60", "$61", "$62", "$63",               \
 696   "$64", "$65", "$66", "$67", "$68", "$69", "$70", "$71",               \
 697   "$72", "$73", "$74", "$75", "$76", "$77", "$78", "$79",               \
 698   "$80", "$81", "$82", "$83", "$84", "$85", "$86", "$87",               \
 699   "$88", "$89", "$90", "$91", "$92", "$93", "$94", "$95",               \
 700   "$96", "$97", "$98", "$99", "$100", "$101", "$102", "$103",           \
 701   "$104", "$105", "$106", "$107", "$108", "$109", "$110", "$111",       \
 702   "$112", "$113", "$114", "$115", "$116", "$117", "$118", "$119",       \
 703   "$120", "$121", "$122", "$123", "$124", "$125", "$126", "$127",       \
 704   "$128", "$129", "$130", "$131", "$132", "$133", "$134", "$135",       \
 705   "$136", "$137", "$138", "$139", "$140", "$141", "$142", "$143",       \
 706   "$144", "$145", "$146", "$147", "$148", "$149", "$150", "$151",       \
 707   "$152", "$153", "$154", "$155", "$156", "$157", "$158", "$159",       \
 708   "$160", "$161", "$162", "$163", "$164", "$165", "$166", "$167",       \
 709   "$168", "$169", "$170", "$171", "$172", "$173", "$174", "$175",       \
 710   "$176", "$177", "$178", "$179", "$180", "$181", "$182", "$183",       \
 711   "$184", "$185", "$186", "$187", "$188", "$189", "$190", "$191",       \
 712   "$192", "$193", "$194", "$195", "$196", "$197", "$198", "$199",       \
 713   "$200", "$201", "$202", "$203", "$204", "$205", "$206", "$207",       \
 714   "$208", "$209", "$210", "$211", "$212", "$213", "$214", "$215",       \
 715   "$216", "$217", "$218", "$219", "$220", "$221", "$222", "$223",       \
 716   "$224", "$225", "$226", "$227", "$228", "$229", "$230", "$231",       \
 717   "$232", "$233", "$234", "$235", "$236", "$237", "$238", "$239",       \
 718   "$240", "$241", "$242", "$243", "$244", "$245", "$246", "$247",       \
 719   "$248", "$249", "$250", "$251", "$252", "$253", "$254", "$255",       \
 720   ":rD",  ":rE",  ":rH",  ":rJ",  ":rR",  "ap_!BAD!", ":rO"}
 721
 722 #define ADDITIONAL_REGISTER_NAMES                       \
 723  {{"sp", 254}, {":sp", 254}, {"rD", 256}, {"rE", 257},  \
 724   {"rH", 258}, {"rJ", MMIX_rJ_REGNUM}, {"rO", MMIX_rO_REGNUM}}
 725
 726 #define ASM_OUTPUT_REG_PUSH(STREAM, REGNO) \
 727  mmix_asm_output_reg_push (STREAM, REGNO)
 728
 729 #define ASM_OUTPUT_REG_POP(STREAM, REGNO) \
 730  mmix_asm_output_reg_pop (STREAM, REGNO)
 731
 732
 733 /* Node: Dispatch Tables */
 734
 735 /* We define both types, since SImode is the better, but DImode the only
 736    possible for mmixal so that's the one actually used.  */
 737 #define ASM_OUTPUT_ADDR_DIFF_ELT(STREAM, BODY, VALUE, REL) \
 738  mmix_asm_output_addr_diff_elt (STREAM, BODY, VALUE, REL)
 739
 740 #define ASM_OUTPUT_ADDR_VEC_ELT(STREAM, VALUE) \
 741  mmix_asm_output_addr_vec_elt (STREAM, VALUE)
 742
 743
 744 /* Node: Exception Region Output */
 745 /* (empty) */
 746
 747 /* Node: Alignment Output */
 748
 749 #define ASM_OUTPUT_SKIP(STREAM, NBYTES) \
 750  mmix_asm_output_skip (STREAM, NBYTES)
 751
 752 #define ASM_OUTPUT_ALIGN(STREAM, POWER) \
 753  mmix_asm_output_align (STREAM, POWER)
 754
 755
 756 /* Node: All Debuggers */
 757
 758 #define DBX_REGISTER_NUMBER(REGNO) \
 759  mmix_dbx_register_number (REGNO)
 760
 761
 762 /* Node: DBX Options */
 763 /* (empty) */
 764 /* Node: DBX Hooks */
 765 /* (empty) */
 766 /* Node: File Names and DBX */
 767 /* (empty) */
 768
 769
 770 /* Node: SDB and DWARF */
 771 #define DWARF2_DEBUGGING_INFO 1
 772 #define DWARF2_ASM_LINE_DEBUG_INFO 1
 773
 774 /* Node: Misc */
 775
 776 /* There's no way to get a PC-relative offset into tables for SImode, so
 777    for the moment we have absolute entries in DImode.
 778    When we're going ELF, these should be SImode and 1.  */
 779 #define CASE_VECTOR_MODE DImode
 780 #define CASE_VECTOR_PC_RELATIVE 0
 781
 782 #define WORD_REGISTER_OPERATIONS 1
 783
 784 /* We have a choice, which makes this yet another parameter to tweak.  The
 785    gut feeling is currently that SIGN_EXTEND wins; "int" is more frequent
 786    than "unsigned int", and we have signed characters.  FIXME: measure.  */
 787 #define LOAD_EXTEND_OP(MODE) (TARGET_ZERO_EXTEND ? ZERO_EXTEND : SIGN_EXTEND)
 788
 789 #define MOVE_MAX 8
 790
 791 #define TRULY_NOOP_TRUNCATION(OUTPREC, INPREC) 1
 792
 793 /* ??? MMIX allows a choice of STORE_FLAG_VALUE.  Revisit later,
 794    we don't have scc expanders yet.  */
 795
 796 #define Pmode DImode
 797
 798 #define FUNCTION_MODE QImode
 799
 800 #define NO_IMPLICIT_EXTERN_C
 801
 802 /* mmix-knuth-mmixware target has no support of C99 runtime */
 803 #undef TARGET_LIBC_HAS_FUNCTION
 804 #define TARGET_LIBC_HAS_FUNCTION no_c99_libc_has_function
 805
 806 /* These are checked.  */
 807 #define DOLLARS_IN_IDENTIFIERS 0
 808 #define NO_DOLLAR_IN_LABEL
 809 #define NO_DOT_IN_LABEL
 810
 811 #endif /* GCC_MMIX_H */
 812 /*
 813  * Local variables:
 814  * eval: (c-set-style "gnu")
 815  * indent-tabs-mode: t
 816  * End:
 817  */