gcc/config/mt/mt.h

   1 /* Target Definitions for MorphoRISC1
   2    Copyright (C) 2005, 2006, 2007 Free Software Foundation, Inc.
   3    Contributed by Red Hat, Inc.
   4
   5    This file is part of GCC.
   6
   7    GCC is free software; you can redistribute it and/or modify it
   8    under the terms of the GNU General Public License as published
   9    by the Free Software Foundation; either version 3, or (at your
  10    option) any later version.
  11
  12    GCC is distributed in the hope that it will be useful, but WITHOUT
  13    ANY WARRANTY; without even the implied warranty of MERCHANTABILITY
  14    or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public
  15    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 extern struct rtx_def * mt_ucmpsi3_libcall;
  22
  23 enum processor_type
  24 {
  25   PROCESSOR_MS1_64_001,
  26   PROCESSOR_MS1_16_002,
  27   PROCESSOR_MS1_16_003,
  28   PROCESSOR_MS2
  29 };
  30
  31 enum epilogue_type
  32 {
  33   EH_EPILOGUE,
  34   NORMAL_EPILOGUE
  35 };
  36
  37 extern enum processor_type mt_cpu;
  38
  39 \f
  40 /* Support for a compile-time default CPU, et cetera.  The rules are:
  41    --with-arch is ignored if -march is specified.  */
  42 #define OPTION_DEFAULT_SPECS \
  43   {"arch", "%{!march=*:-march=%(VALUE)}" }
  44
  45 /* A C string constant that tells the GCC driver program options to pass to
  46    the assembler.  */
  47 #undef  ASM_SPEC
  48 #define ASM_SPEC "%{march=*} %{!march=*: -march=ms1-16-002}"
  49
  50 /* A string to pass to at the end of the command given to the linker.  */
  51 #undef  LIB_SPEC
  52 #define LIB_SPEC "--start-group -lc -lsim --end-group \
  53 %{msim: ; \
  54 march=ms1-64-001:-T 64-001.ld%s; \
  55 march=ms1-16-002:-T 16-002.ld%s; \
  56 march=ms1-16-003:-T 16-003.ld%s; \
  57 march=ms2:-T ms2.ld%s; \
  58          :-T 16-002.ld}"
  59
  60 /* A string to pass at the very beginning of the command given to the
  61    linker.  */
  62 #undef  STARTFILE_SPEC
  63 #define STARTFILE_SPEC "%{msim:crt0.o%s;\
  64 march=ms1-64-001:%{!mno-crt0:crt0-64-001.o%s} startup-64-001.o%s; \
  65 march=ms1-16-002:%{!mno-crt0:crt0-16-002.o%s} startup-16-002.o%s; \
  66 march=ms1-16-003:%{!mno-crt0:crt0-16-003.o%s} startup-16-003.o%s; \
  67 march=ms2:%{!mno-crt0:crt0-ms2.o%s} startup-ms2.o%s; \
  68          :%{!mno-crt0:crt0-16-002.o%s} startup-16-002.o%s} \
  69 crti.o%s crtbegin.o%s"
  70
  71 /* A string to pass at the end of the command given to the linker.  */
  72 #undef  ENDFILE_SPEC
  73 #define ENDFILE_SPEC "%{msim:exit.o%s; \
  74 march=ms1-64-001:exit-64-001.o%s; \
  75 march=ms1-16-002:exit-16-002.o%s; \
  76 march=ms1-16-003:exit-16-003.o%s; \
  77 march=ms2:exit-ms2.o%s; \
  78          :exit-16-002.o%s} \
  79  crtend.o%s crtn.o%s"
  80 \f
  81 /* Run-time target specifications.  */
  82
  83 #define TARGET_CPU_CPP_BUILTINS()               \
  84   do                                            \
  85     {                                           \
  86       builtin_define_with_int_value ("__mt__", mt_cpu); \
  87       builtin_assert ("machine=mt");            \
  88     }                                           \
  89   while (0)
  90
  91 #define TARGET_MS1_64_001 (mt_cpu == PROCESSOR_MS1_64_001)
  92 #define TARGET_MS1_16_002 (mt_cpu == PROCESSOR_MS1_16_002)
  93 #define TARGET_MS1_16_003 (mt_cpu == PROCESSOR_MS1_16_003)
  94 #define TARGET_MS2 (mt_cpu == PROCESSOR_MS2)
  95
  96 #define TARGET_VERSION  fprintf (stderr, " (mt)");
  97
  98 #define OVERRIDE_OPTIONS mt_override_options ()
  99
 100 #define CAN_DEBUG_WITHOUT_FP 1
 101
 102 \f
 103 /* Storage Layout.  */
 104
 105 #define BITS_BIG_ENDIAN 0
 106
 107 #define BYTES_BIG_ENDIAN 1
 108
 109 #define WORDS_BIG_ENDIAN 1
 110
 111 #define UNITS_PER_WORD 4
 112
 113 /* A macro to update MODE and UNSIGNEDP when an object whose type is TYPE and
 114    which has the specified mode and signedness is to be stored in a register.
 115    This macro is only called when TYPE is a scalar type.
 116
 117    On most RISC machines, which only have operations that operate on a full
 118    register, define this macro to set M to `word_mode' if M is an integer mode
 119    narrower than `BITS_PER_WORD'.  In most cases, only integer modes should be
 120    widened because wider-precision floating-point operations are usually more
 121    expensive than their narrower counterparts.
 122
 123    For most machines, the macro definition does not change UNSIGNEDP.  However,
 124    some machines, have instructions that preferentially handle either signed or
 125    unsigned quantities of certain modes.  For example, on the DEC Alpha, 32-bit
 126    loads from memory and 32-bit add instructions sign-extend the result to 64
 127    bits.  On such machines, set UNSIGNEDP according to which kind of extension
 128    is more efficient.
 129
 130    Do not define this macro if it would never modify MODE.  */
 131 #define PROMOTE_MODE(MODE,UNSIGNEDP,TYPE)                       \
 132   do                                                            \
 133     {                                                           \
 134       if (GET_MODE_CLASS (MODE) == MODE_INT                     \
 135           && GET_MODE_SIZE (MODE) < 4)                          \
 136         (MODE) = SImode;                                        \
 137     }                                                           \
 138   while (0)
 139
 140 /* Normal alignment required for function parameters on the stack, in bits.
 141    All stack parameters receive at least this much alignment regardless of data
 142    type.  On most machines, this is the same as the size of an integer.  */
 143 #define PARM_BOUNDARY 32
 144
 145 /* Define this macro to the minimum alignment enforced by hardware for
 146    the stack pointer on this machine.  The definition is a C
 147    expression for the desired alignment (measured in bits).  This
 148    value is used as a default if PREFERRED_STACK_BOUNDARY is not
 149    defined.  On most machines, this should be the same as
 150    PARM_BOUNDARY.  */
 151 #define STACK_BOUNDARY 32
 152
 153 /* Alignment required for a function entry point, in bits.  */
 154 #define FUNCTION_BOUNDARY 32
 155
 156 /* Biggest alignment that any data type can require on this machine,
 157    in bits.  */
 158 #define BIGGEST_ALIGNMENT 32
 159
 160 /* If defined, a C expression to compute the alignment for a variable
 161    in the static store.  TYPE is the data type, and ALIGN is the
 162    alignment that the object would ordinarily have.  The value of this
 163    macro is used instead of that alignment to align the object.
 164
 165    If this macro is not defined, then ALIGN is used.  */
 166 #define DATA_ALIGNMENT(TYPE, ALIGN)             \
 167   (TREE_CODE (TYPE) == ARRAY_TYPE               \
 168    && TYPE_MODE (TREE_TYPE (TYPE)) == QImode    \
 169    && (ALIGN) < BITS_PER_WORD ? BITS_PER_WORD : (ALIGN))
 170
 171 /* If defined, a C expression to compute the alignment given to a constant that
 172    is being placed in memory.  CONSTANT is the constant and ALIGN is the
 173    alignment that the object would ordinarily have.  The value of this macro is
 174    used instead of that alignment to align the object.
 175
 176    If this macro is not defined, then ALIGN is used.
 177
 178    The typical use of this macro is to increase alignment for string constants
 179    to be word aligned so that `strcpy' calls that copy constants can be done
 180    inline.  */
 181 #define CONSTANT_ALIGNMENT(EXP, ALIGN)  \
 182   (TREE_CODE (EXP) == STRING_CST        \
 183    && (ALIGN) < BITS_PER_WORD ? BITS_PER_WORD : (ALIGN))
 184
 185 /* Number of bits which any structure or union's size must be a multiple of.
 186    Each structure or union's size is rounded up to a multiple of this.
 187
 188    If you do not define this macro, the default is the same as `BITS_PER_UNIT'.  */
 189 #define STRUCTURE_SIZE_BOUNDARY 32
 190
 191 /* Define this macro to be the value 1 if instructions will fail to work if
 192    given data not on the nominal alignment.  If instructions will merely go
 193    slower in that case, define this macro as 0.  */
 194 #define STRICT_ALIGNMENT 1
 195
 196 /* Define this if you wish to imitate the way many other C compilers handle
 197    alignment of bitfields and the structures that contain them.  */
 198 #define PCC_BITFIELD_TYPE_MATTERS 1
 199 \f
 200 /* Layout of Source Language Data Types.  */
 201
 202 #define INT_TYPE_SIZE 32
 203
 204 #define SHORT_TYPE_SIZE 16
 205
 206 #define LONG_TYPE_SIZE 32
 207
 208 #define LONG_LONG_TYPE_SIZE 64
 209
 210 #define CHAR_TYPE_SIZE 8
 211
 212 #define FLOAT_TYPE_SIZE 32
 213
 214 #define DOUBLE_TYPE_SIZE 64
 215
 216 #define LONG_DOUBLE_TYPE_SIZE 64
 217
 218 #define DEFAULT_SIGNED_CHAR 1
 219 \f
 220 /* Register Basics.  */
 221
 222 /* General purpose registers.  */
 223 #define GPR_FIRST       0               /* First gpr */
 224 #define GPR_LAST        15              /* Last possible gpr */
 225
 226 #define GPR_R0          0               /* Always 0 */
 227 #define GPR_R7          7               /* Used as a scratch register */
 228 #define GPR_R8          8               /* Used as a scratch register */
 229 #define GPR_R9          9               /* Used as a scratch register */
 230 #define GPR_R10         10              /* Used as a scratch register */
 231 #define GPR_R11         11              /* Used as a scratch register */
 232 #define GPR_FP          12              /* Frame pointer */
 233 #define GPR_SP          13              /* Stack pointer */
 234 #define GPR_LINK        14              /* Saved return address as
 235                                            seen  by the caller */
 236 #define GPR_INTERRUPT_LINK 15           /* hold return addres for interrupts */
 237
 238 #define LOOP_FIRST         (GPR_LAST + 1)
 239 #define LOOP_LAST          (LOOP_FIRST + 3)
 240
 241 /* Argument register that is eliminated in favor of the frame and/or stack
 242    pointer.  Also add register to point to where the return address is
 243    stored.  */
 244 #define SPECIAL_REG_FIRST               (LOOP_LAST + 1)
 245 #define SPECIAL_REG_LAST                (SPECIAL_REG_FIRST)
 246 #define ARG_POINTER_REGNUM              (SPECIAL_REG_FIRST + 0)
 247 #define SPECIAL_REG_P(R)                ((R) == SPECIAL_REG_FIRST)
 248
 249 /* The first/last register that can contain the arguments to a function.  */
 250 #define FIRST_ARG_REGNUM        1
 251 #define LAST_ARG_REGNUM         4
 252
 253 /* The register used to hold functions return value */
 254 #define RETVAL_REGNUM           11
 255
 256 #define FIRST_PSEUDO_REGISTER (SPECIAL_REG_LAST + 1)
 257
 258 #define IS_PSEUDO_P(R)  (REGNO (R) >= FIRST_PSEUDO_REGISTER)
 259
 260 /* R0           always has the value 0
 261    R10          static link
 262    R12  FP      pointer to active frame
 263    R13  SP      pointer to top of stack
 264    R14  RA      return address
 265    R15  IRA     interrupt return address.  */
 266 #define FIXED_REGISTERS { 1, 0, 0, 0, 0, 0, 0, 0, \
 267                           0, 0, 0, 0, 1, 1, 1, 1, \
 268                           1, 1, 1, 1, 1           \
 269                          }
 270
 271 /* Like `FIXED_REGISTERS' but has 1 for each register that is clobbered (in
 272    general) by function calls as well as for fixed registers.  This macro
 273    therefore identifies the registers that are not available for general
 274    allocation of values that must live across function calls.  */
 275 #define CALL_USED_REGISTERS     { 1, 1, 1, 1, 1, 0, 0, 1, \
 276                                   1, 1, 1, 1, 1, 1, 1, 1, \
 277                                   1, 1, 1, 1, 1           \
 278                                 }
 279
 280 \f
 281 /* How Values Fit in Registers.  */
 282
 283 #define HARD_REGNO_NREGS(REGNO, MODE)                           \
 284   ((GET_MODE_SIZE (MODE) + UNITS_PER_WORD - 1) / UNITS_PER_WORD)
 285
 286 #define HARD_REGNO_MODE_OK(REGNO, MODE) 1
 287
 288 /* A C expression that is nonzero if a value of mode MODE1 is
 289    accessible in mode MODE2 without copying.  */
 290 #define MODES_TIEABLE_P(MODE1, MODE2) 1
 291 \f
 292 /* Register Classes.  */
 293
 294 enum reg_class
 295 {
 296   NO_REGS,
 297   ALL_REGS,
 298   LIM_REG_CLASSES
 299 };
 300
 301 #define   GENERAL_REGS  ALL_REGS
 302
 303 #define N_REG_CLASSES ((int) LIM_REG_CLASSES)
 304
 305 #define REG_CLASS_NAMES {"NO_REGS", "ALL_REGS" }
 306
 307 #define REG_CLASS_CONTENTS \
 308    {                                                            \
 309      { 0x0 },                                                   \
 310      { 0x000fffff },                                            \
 311    }
 312
 313 /* A C expression whose value is a register class containing hard register
 314    REGNO.  In general there is more than one such class; choose a class which
 315    is "minimal", meaning that no smaller class also contains the register.  */
 316 #define REGNO_REG_CLASS(REGNO) GENERAL_REGS
 317
 318 #define BASE_REG_CLASS GENERAL_REGS
 319
 320 #define INDEX_REG_CLASS NO_REGS
 321
 322 #define REG_CLASS_FROM_LETTER(CHAR) NO_REGS
 323
 324 #define REGNO_OK_FOR_BASE_P(NUM) 1
 325
 326 #define REGNO_OK_FOR_INDEX_P(NUM) 1
 327
 328 /* A C expression that places additional restrictions on the register class to
 329    use when it is necessary to copy value X into a register in class CLASS.
 330    The value is a register class; perhaps CLASS, or perhaps another, smaller
 331    class.  On many machines, the following definition is safe:
 332
 333         #define PREFERRED_RELOAD_CLASS(X,CLASS) CLASS
 334 */
 335 #define PREFERRED_RELOAD_CLASS(X, CLASS) (CLASS)
 336
 337 #define SECONDARY_RELOAD_CLASS(CLASS,MODE,X) \
 338   mt_secondary_reload_class((CLASS), (MODE), (X))
 339
 340 /* A C expression for the maximum number of consecutive registers of
 341    class CLASS needed to hold a value of mode MODE.  */
 342 #define CLASS_MAX_NREGS(CLASS, MODE) \
 343   ((GET_MODE_SIZE (MODE) + UNITS_PER_WORD - 1) / UNITS_PER_WORD)
 344
 345 /* For MorphoRISC1:
 346
 347    `I'  is used for the range of constants an arithmetic insn can
 348         actually contain (16-bit signed integers).
 349
 350    `J'  is used for the range which is just zero (ie, $r0).
 351
 352    `K'  is used for the range of constants a logical insn can actually
 353         contain (16-bit zero-extended integers).
 354
 355    `L'  is used for the range of constants that be loaded with lui
 356         (ie, the bottom 16 bits are zero).
 357
 358    `M'  is used for the range of constants that take two words to load
 359         (ie, not matched by `I', `K', and `L').
 360
 361    `N'  is used for negative 16-bit constants other than -65536.
 362
 363    `O'  is a 15-bit signed integer.
 364
 365    `P'  is used for positive 16-bit constants.  */
 366
 367 #define SMALL_INT(X) ((unsigned HOST_WIDE_INT) (INTVAL (X) + 0x8000) < 0x10000)
 368 #define SMALL_INT_UNSIGNED(X) ((unsigned HOST_WIDE_INT) (INTVAL (X)) < 0x10000)
 369
 370 /* A C expression that defines the machine-dependent operand
 371    constraint letters that specify particular ranges of integer
 372    values.  If C is one of those letters, the expression should check
 373    that VALUE, an integer, is in the appropriate range and return 1 if
 374    so, 0 otherwise.  If C is not one of those letters, the value
 375    should be 0 regardless of VALUE.  */
 376 #define CONST_OK_FOR_LETTER_P(VALUE, C)                                 \
 377   ((C) == 'I' ? ((unsigned HOST_WIDE_INT) ((VALUE) + 0x8000) < 0x10000) \
 378    : (C) == 'J' ? ((VALUE) == 0)                                        \
 379    : (C) == 'K' ? ((unsigned HOST_WIDE_INT) (VALUE) < 0x10000)          \
 380    : (C) == 'L' ? (((VALUE) & 0x0000ffff) == 0                          \
 381                    && (((VALUE) & ~2147483647) == 0                     \
 382                        || ((VALUE) & ~2147483647) == ~2147483647))      \
 383    : (C) == 'M' ? ((((VALUE) & ~0x0000ffff) != 0)                       \
 384                    && (((VALUE) & ~0x0000ffff) != ~0x0000ffff)          \
 385                    && (((VALUE) & 0x0000ffff) != 0                      \
 386                        || (((VALUE) & ~2147483647) != 0                 \
 387                            && ((VALUE) & ~2147483647) != ~2147483647))) \
 388    : (C) == 'N' ? ((unsigned HOST_WIDE_INT) ((VALUE) + 0xffff) < 0xffff) \
 389    : (C) == 'O' ? ((unsigned HOST_WIDE_INT) ((VALUE) + 0x4000) < 0x8000) \
 390    : (C) == 'P' ? ((VALUE) != 0 && (((VALUE) & ~0x0000ffff) == 0))      \
 391    : 0)
 392
 393 /* A C expression that defines the machine-dependent operand constraint letters
 394    (`G', `H') that specify particular ranges of `const_double' values.  */
 395 #define CONST_DOUBLE_OK_FOR_LETTER_P(VALUE, C) 0
 396
 397 /* Most negative value represent on mt */
 398 #define MT_MIN_INT 0x80000000
 399 \f
 400 /* Basic Stack Layout.  */
 401
 402 enum save_direction
 403 {
 404   FROM_PROCESSOR_TO_MEM,
 405   FROM_MEM_TO_PROCESSOR
 406 };
 407
 408 /* Tell prologue and epilogue if register REGNO should be saved / restored.
 409    The return address and frame pointer are treated separately.
 410    Don't consider them here.  */
 411 #define MUST_SAVE_REGISTER(regno)                               \
 412   (   (regno) != GPR_LINK                                       \
 413    && (regno) != GPR_FP                                         \
 414    && (regno) != GPR_SP                                         \
 415    && (regno) != GPR_R0                                         \
 416       &&   (( df_regs_ever_live_p (regno) && ! call_used_regs[regno] ) \
 417        /* Save ira register in an interrupt handler.  */        \
 418         || (interrupt_handler && (regno) == GPR_INTERRUPT_LINK) \
 419        /* Save any register used in an interrupt handler.  */   \
 420         || (interrupt_handler && df_regs_ever_live_p (regno))   \
 421        /* Save call clobbered registers in non-leaf interrupt   \
 422           handlers.  */                                         \
 423         || (interrupt_handler && call_used_regs[regno]          \
 424            && !current_function_is_leaf)                        \
 425         ||(crtl->calls_eh_return                        \
 426            && (regno == GPR_R7 || regno == GPR_R8))             \
 427         )                                                       \
 428   )
 429
 430 #define STACK_GROWS_DOWNWARD 1
 431
 432 /* Offset from the frame pointer to the first local variable slot to be
 433    allocated.
 434
 435    If `FRAME_GROWS_DOWNWARD', find the next slot's offset by
 436    subtracting the first slot's length from `STARTING_FRAME_OFFSET'.
 437    Otherwise, it is found by adding the length of the first slot to
 438    the value `STARTING_FRAME_OFFSET'.  */
 439 #define STARTING_FRAME_OFFSET crtl->outgoing_args_size
 440
 441 /* Offset from the argument pointer register to the first argument's address.
 442    On some machines it may depend on the data type of the function.
 443
 444    If `ARGS_GROW_DOWNWARD', this is the offset to the location above the first
 445    argument's address.  */
 446 #define FIRST_PARM_OFFSET(FUNDECL) 0
 447
 448 #define RETURN_ADDR_RTX(COUNT, FRAMEADDR)                               \
 449     mt_return_addr_rtx (COUNT)
 450
 451 /* A C expression whose value is RTL representing the location of the incoming
 452    return address at the beginning of any function, before the prologue.  This
 453    RTL is either a `REG', indicating that the return value is saved in `REG',
 454    or a `MEM' representing a location in the stack.
 455
 456    You only need to define this macro if you want to support call frame
 457    debugging information like that provided by DWARF 2.  */
 458 #define INCOMING_RETURN_ADDR_RTX gen_rtx_REG (SImode, GPR_LINK)
 459
 460 /* A C expression whose value is an integer giving the offset, in bytes, from
 461    the value of the stack pointer register to the top of the stack frame at the
 462    beginning of any function, before the prologue.  The top of the frame is
 463    defined to be the value of the stack pointer in the previous frame, just
 464    before the call instruction.
 465
 466    You only need to define this macro if you want to support call frame
 467    debugging information like that provided by DWARF 2.  */
 468 #define INCOMING_FRAME_SP_OFFSET 0
 469
 470 #define STACK_POINTER_REGNUM GPR_SP
 471
 472 #define FRAME_POINTER_REGNUM GPR_FP
 473
 474 /* The register number of the arg pointer register, which is used to
 475    access the function's argument list.  */
 476 #define ARG_POINTER_REGNUM              (SPECIAL_REG_FIRST + 0)
 477
 478 /* Register numbers used for passing a function's static chain pointer.  */
 479 #define STATIC_CHAIN_REGNUM 10
 480
 481 /* A C expression which is nonzero if a function must have and use a frame
 482    pointer.  */
 483 #define FRAME_POINTER_REQUIRED 0
 484
 485 /* Structure to be filled in by compute_frame_size with register
 486    save masks, and offsets for the current function.  */
 487
 488 struct mt_frame_info
 489 {
 490   unsigned int total_size;      /* # Bytes that the entire frame takes up.  */
 491   unsigned int pretend_size;    /* # Bytes we push and pretend caller did.  */
 492   unsigned int args_size;       /* # Bytes that outgoing arguments take up.  */
 493   unsigned int extra_size;
 494   unsigned int reg_size;        /* # Bytes needed to store regs.  */
 495   unsigned int var_size;        /* # Bytes that variables take up.  */
 496   unsigned int frame_size;      /* # Bytes in current frame.  */
 497   unsigned int reg_mask;        /* Mask of saved registers.  */
 498   unsigned int save_fp;         /* Nonzero if frame pointer must be saved.  */
 499   unsigned int save_lr;         /* Nonzero if return pointer must be saved.  */
 500   int          initialized;     /* Nonzero if frame size already calculated.  */
 501 };
 502
 503 extern struct mt_frame_info current_frame_info;
 504
 505 /* If defined, this macro specifies a table of register pairs used to eliminate
 506    unneeded registers that point into the stack frame.  */
 507 #define ELIMINABLE_REGS                                                 \
 508 {                                                                       \
 509   {ARG_POINTER_REGNUM,   STACK_POINTER_REGNUM},                         \
 510   {ARG_POINTER_REGNUM,   FRAME_POINTER_REGNUM},                         \
 511   {FRAME_POINTER_REGNUM, STACK_POINTER_REGNUM}                          \
 512 }
 513
 514 /* A C expression that returns nonzero if the compiler is allowed to try to
 515    replace register number FROM with register number TO.  */
 516 #define CAN_ELIMINATE(FROM, TO)                                         \
 517  ((FROM) == ARG_POINTER_REGNUM && (TO) == STACK_POINTER_REGNUM          \
 518   ? ! frame_pointer_needed                                              \
 519   : 1)
 520
 521 /* This macro is similar to `INITIAL_FRAME_POINTER_OFFSET'.  It
 522    specifies the initial difference between the specified pair of
 523    registers.  This macro must be defined if `ELIMINABLE_REGS' is
 524    defined.  */
 525 #define INITIAL_ELIMINATION_OFFSET(FROM, TO, OFFSET)                    \
 526   (OFFSET) = mt_initial_elimination_offset (FROM, TO)
 527
 528 /* If defined, the maximum amount of space required for outgoing
 529    arguments will be computed and placed into the variable
 530    `crtl->outgoing_args_size'.  */
 531 #define ACCUMULATE_OUTGOING_ARGS 1
 532
 533 /* Define this if it is the responsibility of the caller to
 534    allocate the area reserved for arguments passed in registers.  */
 535 #define OUTGOING_REG_PARM_STACK_SPACE(FNTYPE) 1
 536
 537 /* The number of register assigned to holding function arguments.  */
 538 #define MT_NUM_ARG_REGS        4
 539
 540 /* Define this if it is the responsibility of the caller to allocate
 541    the area reserved for arguments passed in registers.  */
 542 #define REG_PARM_STACK_SPACE(FNDECL) (MT_NUM_ARG_REGS * UNITS_PER_WORD)
 543
 544 /* Define this macro if `REG_PARM_STACK_SPACE' is defined, but the stack
 545    parameters don't skip the area specified by it.  */
 546 #define STACK_PARMS_IN_REG_PARM_AREA
 547
 548 /* A C expression that should indicate the number of bytes of its own
 549    arguments that a function pops on returning, or 0 if the function
 550    pops no arguments and the caller must therefore pop them all after
 551    the function returns.  */
 552 #define RETURN_POPS_ARGS(FUNDECL, FUNTYPE, STACK_SIZE) 0
 553
 554 #define FUNCTION_ARG(CUM, MODE, TYPE, NAMED) \
 555    mt_function_arg (& (CUM), (MODE), (TYPE), (NAMED), FALSE)
 556
 557 #define CUMULATIVE_ARGS int
 558
 559 #define INIT_CUMULATIVE_ARGS(CUM, FNTYPE, LIBNAME, FNDECL, N_NAMED_ARGS) \
 560     mt_init_cumulative_args (& (CUM), FNTYPE, LIBNAME, FNDECL, FALSE)
 561
 562 #define FUNCTION_ARG_ADVANCE(CUM, MODE, TYPE, NAMED)                    \
 563     mt_function_arg_advance (&CUM, MODE, TYPE, NAMED)
 564
 565 #define FUNCTION_ARG_BOUNDARY(MODE, TYPE)                               \
 566     mt_function_arg_boundary (MODE, TYPE)
 567
 568 #define FUNCTION_ARG_REGNO_P(REGNO)                                     \
 569   ((REGNO) >= FIRST_ARG_REGNUM && ((REGNO) <= LAST_ARG_REGNUM))
 570
 571 #define RETURN_VALUE_REGNUM     RETVAL_REGNUM
 572
 573 #define FUNCTION_VALUE(VALTYPE, FUNC) \
 574    mt_function_value (VALTYPE, TYPE_MODE(VALTYPE), FUNC)
 575
 576 #define LIBCALL_VALUE(MODE) \
 577    mt_function_value (NULL_TREE, MODE, NULL_TREE)
 578
 579 #define FUNCTION_VALUE_REGNO_P(REGNO) ((REGNO) == RETURN_VALUE_REGNUM)
 580
 581 /* A C expression which can inhibit the returning of certain function
 582    values in registers, based on the type of value.  */
 583 #define TARGET_RETURN_IN_MEMORY mt_return_in_memory
 584
 585 /* Define this macro to be 1 if all structure and union return values must be
 586    in memory.  */
 587 #define DEFAULT_PCC_STRUCT_RETURN 0
 588
 589 /* Define this macro as a C expression that is nonzero if the return
 590    instruction or the function epilogue ignores the value of the stack
 591    pointer; in other words, if it is safe to delete an instruction to
 592    adjust the stack pointer before a return from the function.  */
 593 #define EXIT_IGNORE_STACK 1
 594
 595 #define EPILOGUE_USES(REGNO) mt_epilogue_uses(REGNO)
 596
 597 /* Define this macro if the function epilogue contains delay slots to which
 598    instructions from the rest of the function can be "moved".  */
 599 #define DELAY_SLOTS_FOR_EPILOGUE 1
 600
 601 /* A C expression that returns 1 if INSN can be placed in delay slot number N
 602    of the epilogue.  */
 603 #define ELIGIBLE_FOR_EPILOGUE_DELAY(INSN, N) 0
 604
 605 #define FUNCTION_PROFILER(FILE, LABELNO) gcc_unreachable ()
 606
 607 /* Trampolines are not implemented.  */
 608 #define TRAMPOLINE_SIZE 0
 609
 610 #define INITIALIZE_TRAMPOLINE(ADDR, FNADDR, STATIC_CHAIN)
 611
 612 /* ?? What is this -- aldyh ?? */
 613 #define UCMPSI3_LIBCALL         "__ucmpsi3"
 614
 615 /* Addressing Modes.  */
 616
 617 /* A C expression that is 1 if the RTX X is a constant which is a valid
 618    address.  */
 619 #define CONSTANT_ADDRESS_P(X) CONSTANT_P (X)
 620
 621 /* A number, the maximum number of registers that can appear in a valid memory
 622    address.  Note that it is up to you to specify a value equal to the maximum
 623    number that `GO_IF_LEGITIMATE_ADDRESS' would ever accept.  */
 624 #define MAX_REGS_PER_ADDRESS 1
 625
 626 #ifdef REG_OK_STRICT
 627 #define GO_IF_LEGITIMATE_ADDRESS(MODE, X, ADDR) \
 628 {                                               \
 629   if (mt_legitimate_address_p (MODE, X, 1))     \
 630     goto ADDR;                                  \
 631 }
 632 #else
 633 #define GO_IF_LEGITIMATE_ADDRESS(MODE, X, ADDR) \
 634 {                                               \
 635   if (mt_legitimate_address_p (MODE, X, 0))     \
 636     goto ADDR;                                  \
 637 }
 638 #endif
 639
 640 #ifdef REG_OK_STRICT
 641 #define REG_OK_FOR_BASE_P(X) mt_reg_ok_for_base_p (X, 1)
 642 #else
 643 #define REG_OK_FOR_BASE_P(X) mt_reg_ok_for_base_p (X, 0)
 644 #endif
 645
 646 #define REG_OK_FOR_INDEX_P(X) REG_OK_FOR_BASE_P (X)
 647
 648 #define LEGITIMIZE_ADDRESS(X, OLDX, MODE, WIN) {}
 649
 650 #define GO_IF_MODE_DEPENDENT_ADDRESS(ADDR, LABEL)
 651
 652 #define LEGITIMATE_CONSTANT_P(X) 1
 653
 654 /* A C expression for the cost of moving data of mode M between a register and
 655    memory.  A value of 2 is the default; this cost is relative to those in
 656    `REGISTER_MOVE_COST'.
 657
 658    If moving between registers and memory is more expensive than between two
 659    registers, you should define this macro to express the relative cost.  */
 660 #define MEMORY_MOVE_COST(M,C,I) 10
 661
 662 /* Define this macro as a C expression which is nonzero if accessing less than
 663    a word of memory (i.e. a `char' or a `short') is no faster than accessing a
 664    word of memory.  */
 665 #define SLOW_BYTE_ACCESS 1
 666
 667 #define SLOW_UNALIGNED_ACCESS(MODE, ALIGN) 1
 668
 669 #define TEXT_SECTION_ASM_OP ".text"
 670
 671 #define DATA_SECTION_ASM_OP ".data"
 672
 673 #define BSS_SECTION_ASM_OP "\t.section\t.bss"
 674
 675 /* A C string constant for text to be output before each `asm' statement or
 676    group of consecutive ones.  Normally this is `"#APP"', which is a comment
 677    that has no effect on most assemblers but tells the GNU assembler that it
 678    must check the lines that follow for all valid assembler constructs.  */
 679 #define ASM_APP_ON "#APP\n"
 680
 681 /* A C string constant for text to be output after each `asm' statement or
 682    group of consecutive ones.  Normally this is `"#NO_APP"', which tells the
 683    GNU assembler to resume making the time-saving assumptions that are valid
 684    for ordinary compiler output.  */
 685 #define ASM_APP_OFF "#NO_APP\n"
 686
 687 /* This is how to output an assembler line defining a `char' constant.  */
 688 #define ASM_OUTPUT_CHAR(FILE, VALUE)                    \
 689   do                                                    \
 690     {                                                   \
 691       fprintf (FILE, "\t.byte\t");                      \
 692       output_addr_const (FILE, (VALUE));                \
 693       fprintf (FILE, "\n");                             \
 694     }                                                   \
 695   while (0)
 696
 697 /* This is how to output an assembler line defining a `short' constant.  */
 698 #define ASM_OUTPUT_SHORT(FILE, VALUE)                   \
 699   do                                                    \
 700     {                                                   \
 701       fprintf (FILE, "\t.hword\t");                     \
 702       output_addr_const (FILE, (VALUE));                \
 703       fprintf (FILE, "\n");                             \
 704     }                                                   \
 705   while (0)
 706
 707 /* This is how to output an assembler line defining an `int' constant.
 708    We also handle symbol output here.  */
 709 #define ASM_OUTPUT_INT(FILE, VALUE)                     \
 710   do                                                    \
 711     {                                                   \
 712       fprintf (FILE, "\t.word\t");                      \
 713       output_addr_const (FILE, (VALUE));                \
 714       fprintf (FILE, "\n");                             \
 715     }                                                   \
 716   while (0)
 717
 718 /* A C statement to output to the stdio stream STREAM an assembler instruction
 719    to assemble a single byte containing the number VALUE.
 720
 721    This declaration must be present.  */
 722 #define ASM_OUTPUT_BYTE(STREAM, VALUE) \
 723   fprintf (STREAM, "\t%s\t0x%x\n", ASM_BYTE_OP, (VALUE))
 724
 725 /* Globalizing directive for a label.  */
 726 #define GLOBAL_ASM_OP "\t.globl "
 727
 728 #define REGISTER_NAMES                                                  \
 729 { "R0", "R1", "R2", "R3", "R4", "R5", "R6", "R7",                       \
 730   "R8", "R9", "R10", "R11", "R12", "R13", "R14", "R15",                 \
 731   "LOOP1", "LOOP2", "LOOP3", "LOOP4", "ap" }
 732
 733 /* If defined, a C initializer for an array of structures containing a name and
 734    a register number.  This macro defines additional names for hard registers,
 735    thus allowing the `asm' option in declarations to refer to registers using
 736    alternate names.  */
 737 #define ADDITIONAL_REGISTER_NAMES \
 738 { { "FP", 12}, {"SP", 13}, {"RA", 14}, {"IRA", 15} }
 739
 740 /* Define this macro if you are using an unusual assembler that requires
 741    different names for the machine instructions.
 742
 743    The definition is a C statement or statements which output an assembler
 744    instruction opcode to the stdio stream STREAM.  The macro-operand PTR is a
 745    variable of type `char *' which points to the opcode name in its "internal"
 746    form--the form that is written in the machine description.  The definition
 747    should output the opcode name to STREAM, performing any translation you
 748    desire, and increment the variable PTR to point at the end of the opcode so
 749    that it will not be output twice.  */
 750 #define ASM_OUTPUT_OPCODE(STREAM, PTR) \
 751    (PTR) = mt_asm_output_opcode (STREAM, PTR)
 752
 753 #define FINAL_PRESCAN_INSN(INSN, OPVEC, NOPERANDS) \
 754   mt_final_prescan_insn (INSN, OPVEC, NOPERANDS)
 755
 756 #define PRINT_OPERAND(STREAM, X, CODE) mt_print_operand (STREAM, X, CODE)
 757
 758 /* A C expression which evaluates to true if CODE is a valid punctuation
 759    character for use in the `PRINT_OPERAND' macro.  */
 760 /* #:  Print nop for delay slot.  */
 761 #define PRINT_OPERAND_PUNCT_VALID_P(CODE) ((CODE) == '#')
 762
 763 #define PRINT_OPERAND_ADDRESS(STREAM, X) mt_print_operand_address (STREAM, X)
 764
 765 /* If defined, C string expressions to be used for the `%R', `%L', `%U', and
 766    `%I' options of `asm_fprintf' (see `final.c').  These are useful when a
 767    single `md' file must support multiple assembler formats.  In that case, the
 768    various `tm.h' files can define these macros differently.
 769
 770    USER_LABEL_PREFIX is defined in svr4.h.  */
 771 #define REGISTER_PREFIX     "%"
 772 #define LOCAL_LABEL_PREFIX  "."
 773 #define USER_LABEL_PREFIX   ""
 774 #define IMMEDIATE_PREFIX    ""
 775
 776 /* This macro should be provided on machines where the addresses in a dispatch
 777    table are relative to the table's own address.
 778
 779    The definition should be a C statement to output to the stdio stream STREAM
 780    an assembler pseudo-instruction to generate a difference between two labels.
 781    VALUE and REL are the numbers of two internal labels.  The definitions of
 782    these labels are output using `targetm.asm_out.internal_label', and they
 783    must be printed in the same way here.  */
 784 #define ASM_OUTPUT_ADDR_DIFF_ELT(STREAM, BODY, VALUE, REL) \
 785 fprintf (STREAM, "\t.word .L%d-.L%d\n", VALUE, REL)
 786
 787 /* This macro should be provided on machines where the addresses in a dispatch
 788    table are absolute.
 789
 790    The definition should be a C statement to output to the stdio stream STREAM
 791    an assembler pseudo-instruction to generate a reference to a label.  VALUE
 792    is the number of an internal label whose definition is output using
 793    `targetm.asm_out.internal_label'.  */
 794 #define ASM_OUTPUT_ADDR_VEC_ELT(STREAM, VALUE) \
 795 fprintf (STREAM, "\t.word .L%d\n", VALUE)
 796
 797 #define DWARF_FRAME_RETURN_COLUMN DWARF_FRAME_REGNUM (GPR_LINK)
 798
 799 #define EH_RETURN_DATA_REGNO(N) \
 800   ((N) == 0 ? GPR_R7 : (N) == 1 ? GPR_R8 : INVALID_REGNUM)
 801
 802 #define EH_RETURN_STACKADJ_REGNO        GPR_R11
 803 #define EH_RETURN_STACKADJ_RTX          \
 804         gen_rtx_REG (SImode, EH_RETURN_STACKADJ_REGNO)
 805 #define EH_RETURN_HANDLER_REGNO         GPR_R10
 806 #define EH_RETURN_HANDLER_RTX           \
 807         gen_rtx_REG (SImode, EH_RETURN_HANDLER_REGNO)
 808 \f
 809 #define ASM_OUTPUT_ALIGN(STREAM, POWER) \
 810   fprintf ((STREAM), "\t.p2align %d\n", (POWER))
 811
 812 #define PREFERRED_DEBUGGING_TYPE DWARF2_DEBUG
 813
 814 #ifndef DWARF2_DEBUGGING_INFO
 815 #define DWARF2_DEBUGGING_INFO
 816 #endif
 817
 818 /* Define this macro if GCC should produce dwarf version 2-style
 819    line numbers.  This usually requires extending the assembler to
 820    support them, and #defining DWARF2_LINE_MIN_INSN_LENGTH in the
 821    assembler configuration header files.  */
 822 #define DWARF2_ASM_LINE_DEBUG_INFO 1
 823
 824 /* An alias for a machine mode name.  This is the machine mode that
 825    elements of a jump-table should have.  */
 826 #define CASE_VECTOR_MODE SImode
 827
 828 /* Define this macro if operations between registers with integral
 829    mode smaller than a word are always performed on the entire
 830    register.  Most RISC machines have this property and most CISC
 831    machines do not.  */
 832 #define WORD_REGISTER_OPERATIONS
 833
 834 /* The maximum number of bytes that a single instruction can move quickly from
 835    memory to memory.  */
 836 #define MOVE_MAX 4
 837
 838 /* A C expression which is nonzero if on this machine it is safe to "convert"
 839    an integer of INPREC bits to one of OUTPREC bits (where OUTPREC is smaller
 840    than INPREC) by merely operating on it as if it had only OUTPREC bits.
 841
 842    On many machines, this expression can be 1.
 843
 844    When `TRULY_NOOP_TRUNCATION' returns 1 for a pair of sizes for modes for
 845    which `MODES_TIEABLE_P' is 0, suboptimal code can result.  If this is the
 846    case, making `TRULY_NOOP_TRUNCATION' return 0 in such cases may improve
 847    things.  */
 848 #define TRULY_NOOP_TRUNCATION(OUTPREC, INPREC) 1
 849
 850 #define Pmode SImode
 851
 852 /* An alias for the machine mode used for memory references to functions being
 853    called, in `call' RTL expressions.  On most machines this should be
 854    `QImode'.  */
 855 #define FUNCTION_MODE QImode
 856
 857 #define HANDLE_SYSV_PRAGMA 1
 858
 859 /* Indicate how many instructions can be issued at the same time.  */
 860 #define ISSUE_RATE 1
 861
 862 /* Define the information needed to generate branch and scc insns.  This is
 863    stored from the compare operation.  Note that we can't use "rtx" here
 864    since it hasn't been defined!  */
 865
 866 extern struct rtx_def * mt_compare_op0;
 867 extern struct rtx_def * mt_compare_op1;
 868