gcc/config/m32r/m32r.h

   1 /* Definitions of target machine for GNU compiler, Renesas M32R cpu.
   2    Copyright (C) 1996-2018 Free Software Foundation, Inc.
   3
   4    This file is part of GCC.
   5
   6    GCC is free software; you can redistribute it and/or modify it
   7    under the terms of the GNU General Public License as published
   8    by the Free Software Foundation; either version 3, or (at your
   9    option) any later version.
  10
  11    GCC is distributed in the hope that it will be useful, but WITHOUT
  12    ANY WARRANTY; without even the implied warranty of MERCHANTABILITY
  13    or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public
  14    License for more details.
  15
  16    You should have received a copy of the GNU General Public License
  17    along with GCC; see the file COPYING3.  If not see
  18    <http://www.gnu.org/licenses/>.  */
  19
  20 /* Things to do:
  21 - longlong.h?
  22 */
  23
  24 #undef SIZE_TYPE
  25 #undef PTRDIFF_TYPE
  26 #undef WCHAR_TYPE
  27 #undef WCHAR_TYPE_SIZE
  28 #undef CPP_SPEC
  29 #undef ASM_SPEC
  30 #undef LINK_SPEC
  31 #undef STARTFILE_SPEC
  32 #undef ENDFILE_SPEC
  33
  34 #undef ASM_APP_ON
  35 #undef ASM_APP_OFF
  36 \f
  37
  38 /* M32R/X overrides.  */
  39
  40 /* Additional flags for the preprocessor.  */
  41 #define CPP_CPU_SPEC "%{m32rx:-D__M32RX__ -D__m32rx__ -U__M32R2__ -U__m32r2__} \
  42 %{m32r2:-D__M32R2__ -D__m32r2__ -U__M32RX__ -U__m32rx__} \
  43 %{m32r:-U__M32RX__  -U__m32rx__ -U__M32R2__ -U__m32r2__} \
  44  "
  45
  46 /* Assembler switches.  */
  47 #define ASM_CPU_SPEC \
  48 "%{m32r} %{m32rx} %{m32r2} %{!O0: %{O*: -O}} --no-warn-explicit-parallel-conflicts"
  49
  50 /* Use m32rx specific crt0/crtinit/crtfini files.  */
  51 #define STARTFILE_CPU_SPEC "%{!shared:crt0.o%s} %{m32rx:m32rx/crtinit.o%s} %{!m32rx:crtinit.o%s}"
  52 #define ENDFILE_CPU_SPEC "-lgloss %{m32rx:m32rx/crtfini.o%s} %{!m32rx:crtfini.o%s}"
  53
  54 /* Define this macro as a C expression for the initializer of an array of
  55    strings to tell the driver program which options are defaults for this
  56    target and thus do not need to be handled specially when using
  57    `MULTILIB_OPTIONS'.  */
  58 #define SUBTARGET_MULTILIB_DEFAULTS , "m32r"
  59
  60 /* Number of additional registers the subtarget defines.  */
  61 #define SUBTARGET_NUM_REGISTERS 1
  62
  63 /* 1 for registers that cannot be allocated.  */
  64 #define SUBTARGET_FIXED_REGISTERS , 1
  65
  66 /* 1 for registers that are not available across function calls.  */
  67 #define SUBTARGET_CALL_USED_REGISTERS , 1
  68
  69 /* Order to allocate model specific registers.  */
  70 #define SUBTARGET_REG_ALLOC_ORDER , 19
  71
  72 /* Registers which are accumulators.  */
  73 #define SUBTARGET_REG_CLASS_ACCUM 0x80000
  74
  75 /* All registers added.  */
  76 #define SUBTARGET_REG_CLASS_ALL SUBTARGET_REG_CLASS_ACCUM
  77
  78 /* Additional accumulator registers.  */
  79 #define SUBTARGET_ACCUM_P(REGNO) ((REGNO) == 19)
  80
  81 /* Define additional register names.  */
  82 #define SUBTARGET_REGISTER_NAMES , "a1"
  83 /* end M32R/X overrides.  */
  84
  85 /* Names to predefine in the preprocessor for this target machine.  */
  86 /* __M32R__ is defined by the existing compiler so we use that.  */
  87 #define TARGET_CPU_CPP_BUILTINS()               \
  88   do                                            \
  89     {                                           \
  90       builtin_define ("__M32R__");              \
  91       builtin_define ("__m32r__");              \
  92       builtin_assert ("cpu=m32r");              \
  93       builtin_assert ("machine=m32r");          \
  94       builtin_define (TARGET_BIG_ENDIAN         \
  95                       ? "__BIG_ENDIAN__" : "__LITTLE_ENDIAN__"); \
  96     }                                           \
  97   while (0)
  98
  99 /* This macro defines names of additional specifications to put in the specs
 100    that can be used in various specifications like CC1_SPEC.  Its definition
 101    is an initializer with a subgrouping for each command option.
 102
 103    Each subgrouping contains a string constant, that defines the
 104    specification name, and a string constant that used by the GCC driver
 105    program.
 106
 107    Do not define this macro if it does not need to do anything.  */
 108
 109 #ifndef SUBTARGET_EXTRA_SPECS
 110 #define SUBTARGET_EXTRA_SPECS
 111 #endif
 112
 113 #ifndef ASM_CPU_SPEC
 114 #define ASM_CPU_SPEC ""
 115 #endif
 116
 117 #ifndef CPP_CPU_SPEC
 118 #define CPP_CPU_SPEC ""
 119 #endif
 120
 121 #ifndef CC1_CPU_SPEC
 122 #define CC1_CPU_SPEC ""
 123 #endif
 124
 125 #ifndef LINK_CPU_SPEC
 126 #define LINK_CPU_SPEC ""
 127 #endif
 128
 129 #ifndef STARTFILE_CPU_SPEC
 130 #define STARTFILE_CPU_SPEC "%{!shared:crt0.o%s} crtinit.o%s"
 131 #endif
 132
 133 #ifndef ENDFILE_CPU_SPEC
 134 #define ENDFILE_CPU_SPEC "-lgloss crtfini.o%s"
 135 #endif
 136
 137 #ifndef RELAX_SPEC
 138 #if 0 /* Not supported yet.  */
 139 #define RELAX_SPEC "%{mrelax:-relax}"
 140 #else
 141 #define RELAX_SPEC ""
 142 #endif
 143 #endif
 144
 145 #define EXTRA_SPECS                                                     \
 146   { "asm_cpu",                  ASM_CPU_SPEC },                         \
 147   { "cpp_cpu",                  CPP_CPU_SPEC },                         \
 148   { "cc1_cpu",                  CC1_CPU_SPEC },                         \
 149   { "link_cpu",                 LINK_CPU_SPEC },                        \
 150   { "startfile_cpu",            STARTFILE_CPU_SPEC },                   \
 151   { "endfile_cpu",              ENDFILE_CPU_SPEC },                     \
 152   { "relax",                    RELAX_SPEC },                           \
 153   SUBTARGET_EXTRA_SPECS
 154
 155 #define CPP_SPEC "%(cpp_cpu)"
 156
 157 #undef  CC1_SPEC
 158 #define CC1_SPEC "%{G*} %(cc1_cpu)"
 159
 160 /* Options to pass on to the assembler.  */
 161 #undef  ASM_SPEC
 162 #define ASM_SPEC "%(asm_cpu) %(relax) %{" FPIE_OR_FPIC_SPEC ":-K PIC}"
 163
 164 #define LINK_SPEC "%{v} %(link_cpu) %(relax)"
 165
 166 #undef  STARTFILE_SPEC
 167 #define STARTFILE_SPEC "%(startfile_cpu)"
 168
 169 #undef  ENDFILE_SPEC
 170 #define ENDFILE_SPEC "%(endfile_cpu)"
 171
 172 #undef LIB_SPEC
 173 \f
 174 /* Run-time compilation parameters selecting different hardware subsets.  */
 175
 176 #define TARGET_M32R             (! TARGET_M32RX && ! TARGET_M32R2)
 177
 178 #ifndef TARGET_LITTLE_ENDIAN
 179 #define TARGET_LITTLE_ENDIAN    0
 180 #endif
 181 #define TARGET_BIG_ENDIAN       (! TARGET_LITTLE_ENDIAN)
 182
 183 /* This defaults us to m32r.  */
 184 #ifndef TARGET_CPU_DEFAULT
 185 #define TARGET_CPU_DEFAULT 0
 186 #endif
 187
 188 #ifndef M32R_OPTS_H
 189 #include "config/m32r/m32r-opts.h"
 190 #endif
 191
 192 /* Define this macro as a C expression for the initializer of an array of
 193    strings to tell the driver program which options are defaults for this
 194    target and thus do not need to be handled specially when using
 195    `MULTILIB_OPTIONS'.  */
 196 #ifndef SUBTARGET_MULTILIB_DEFAULTS
 197 #define SUBTARGET_MULTILIB_DEFAULTS
 198 #endif
 199
 200 #ifndef MULTILIB_DEFAULTS
 201 #define MULTILIB_DEFAULTS { "mmodel=small" SUBTARGET_MULTILIB_DEFAULTS }
 202 #endif
 203
 204 #ifndef SUBTARGET_OVERRIDE_OPTIONS
 205 #define SUBTARGET_OVERRIDE_OPTIONS
 206 #endif
 207 \f
 208 /* Target machine storage layout.  */
 209
 210 /* Define this if most significant bit is lowest numbered
 211    in instructions that operate on numbered bit-fields.  */
 212 #define BITS_BIG_ENDIAN 1
 213
 214 /* Define this if most significant byte of a word is the lowest numbered.  */
 215 #define BYTES_BIG_ENDIAN (TARGET_LITTLE_ENDIAN == 0)
 216
 217 /* Define this if most significant word of a multiword number is the lowest
 218    numbered.  */
 219 #define WORDS_BIG_ENDIAN (TARGET_LITTLE_ENDIAN == 0)
 220
 221 /* Width of a word, in units (bytes).  */
 222 #define UNITS_PER_WORD 4
 223
 224 /* Define this macro if it is advisable to hold scalars in registers
 225    in a wider mode than that declared by the program.  In such cases,
 226    the value is constrained to be within the bounds of the declared
 227    type, but kept valid in the wider mode.  The signedness of the
 228    extension may differ from that of the type.  */
 229 #define PROMOTE_MODE(MODE, UNSIGNEDP, TYPE)     \
 230   if (GET_MODE_CLASS (MODE) == MODE_INT         \
 231       && GET_MODE_SIZE (MODE) < UNITS_PER_WORD) \
 232     {                                           \
 233       (MODE) = SImode;                          \
 234     }
 235
 236 /* Allocation boundary (in *bits*) for storing arguments in argument list.  */
 237 #define PARM_BOUNDARY 32
 238
 239 /* Boundary (in *bits*) on which stack pointer should be aligned.  */
 240 #define STACK_BOUNDARY 32
 241
 242 /* ALIGN FRAMES on word boundaries */
 243 #define M32R_STACK_ALIGN(LOC) (((LOC) + 3) & ~ 3)
 244
 245 /* Allocation boundary (in *bits*) for the code of a function.  */
 246 #define FUNCTION_BOUNDARY 32
 247
 248 /* Alignment of field after `int : 0' in a structure.  */
 249 #define EMPTY_FIELD_BOUNDARY 32
 250
 251 /* Every structure's size must be a multiple of this.  */
 252 #define STRUCTURE_SIZE_BOUNDARY 8
 253
 254 /* A bit-field declared as `int' forces `int' alignment for the struct.  */
 255 #define PCC_BITFIELD_TYPE_MATTERS 1
 256
 257 /* No data type wants to be aligned rounder than this.  */
 258 #define BIGGEST_ALIGNMENT 32
 259
 260 /* The best alignment to use in cases where we have a choice.  */
 261 #define FASTEST_ALIGNMENT 32
 262
 263 /* Make arrays of chars word-aligned for the same reasons.  */
 264 #define DATA_ALIGNMENT(TYPE, ALIGN)                                     \
 265   (TREE_CODE (TYPE) == ARRAY_TYPE                                       \
 266    && TYPE_MODE (TREE_TYPE (TYPE)) == QImode                            \
 267    && (ALIGN) < FASTEST_ALIGNMENT ? FASTEST_ALIGNMENT : (ALIGN))
 268
 269 /* Set this nonzero if move instructions will actually fail to work
 270    when given unaligned data.  */
 271 #define STRICT_ALIGNMENT 1
 272
 273 /* Define LAVEL_ALIGN to calculate code length of PNOP at labels.  */
 274 #define LABEL_ALIGN(insn) 2
 275 \f
 276 /* Layout of source language data types.  */
 277
 278 #define SHORT_TYPE_SIZE         16
 279 #define INT_TYPE_SIZE           32
 280 #define LONG_TYPE_SIZE          32
 281 #define LONG_LONG_TYPE_SIZE     64
 282 #define FLOAT_TYPE_SIZE         32
 283 #define DOUBLE_TYPE_SIZE        64
 284 #define LONG_DOUBLE_TYPE_SIZE   64
 285
 286 /* Define this as 1 if `char' should by default be signed; else as 0.  */
 287 #define DEFAULT_SIGNED_CHAR 1
 288
 289 #define SIZE_TYPE "long unsigned int"
 290 #define PTRDIFF_TYPE "long int"
 291 #define WCHAR_TYPE "short unsigned int"
 292 #define WCHAR_TYPE_SIZE 16
 293 \f
 294 /* Standard register usage.  */
 295
 296 /* Number of actual hardware registers.
 297    The hardware registers are assigned numbers for the compiler
 298    from 0 to just below FIRST_PSEUDO_REGISTER.
 299    All registers that the compiler knows about must be given numbers,
 300    even those that are not normally considered general registers.  */
 301
 302 #define M32R_NUM_REGISTERS      19
 303
 304 #ifndef SUBTARGET_NUM_REGISTERS
 305 #define SUBTARGET_NUM_REGISTERS 0
 306 #endif
 307
 308 #define FIRST_PSEUDO_REGISTER (M32R_NUM_REGISTERS + SUBTARGET_NUM_REGISTERS)
 309
 310 /* 1 for registers that have pervasive standard uses
 311    and are not available for the register allocator.
 312
 313    0-3   - arguments/results
 314    4-5   - call used [4 is used as a tmp during prologue/epilogue generation]
 315    6     - call used, gptmp
 316    7     - call used, static chain pointer
 317    8-11  - call saved
 318    12    - call saved [reserved for global pointer]
 319    13    - frame pointer
 320    14    - subroutine link register
 321    15    - stack pointer
 322    16    - arg pointer
 323    17    - carry flag
 324    18    - accumulator
 325    19    - accumulator 1 in the m32r/x
 326    By default, the extension registers are not available.  */
 327
 328 #ifndef SUBTARGET_FIXED_REGISTERS
 329 #define SUBTARGET_FIXED_REGISTERS
 330 #endif
 331
 332 #define FIXED_REGISTERS         \
 333 {                               \
 334   0, 0, 0, 0, 0, 0, 0, 0,       \
 335   0, 0, 0, 0, 0, 0, 0, 1,       \
 336   1, 1, 1                       \
 337   SUBTARGET_FIXED_REGISTERS     \
 338 }
 339
 340 /* 1 for registers not available across function calls.
 341    These must include the FIXED_REGISTERS and also any
 342    registers that can be used without being saved.
 343    The latter must include the registers where values are returned
 344    and the register where structure-value addresses are passed.
 345    Aside from that, you can include as many other registers as you like.  */
 346
 347 #ifndef SUBTARGET_CALL_USED_REGISTERS
 348 #define SUBTARGET_CALL_USED_REGISTERS
 349 #endif
 350
 351 #define CALL_USED_REGISTERS     \
 352 {                               \
 353   1, 1, 1, 1, 1, 1, 1, 1,       \
 354   0, 0, 0, 0, 0, 0, 1, 1,       \
 355   1, 1, 1                       \
 356   SUBTARGET_CALL_USED_REGISTERS \
 357 }
 358
 359 #define CALL_REALLY_USED_REGISTERS CALL_USED_REGISTERS
 360
 361 /* If defined, an initializer for a vector of integers, containing the
 362    numbers of hard registers in the order in which GCC should
 363    prefer to use them (from most preferred to least).  */
 364
 365 #ifndef SUBTARGET_REG_ALLOC_ORDER
 366 #define SUBTARGET_REG_ALLOC_ORDER
 367 #endif
 368
 369 #if 1 /* Better for int code.  */
 370 #define REG_ALLOC_ORDER                         \
 371 {                                               \
 372   4,  5,  6,  7,  2,  3,  8,  9, 10,            \
 373   11, 12, 13, 14,  0,  1, 15, 16, 17, 18        \
 374   SUBTARGET_REG_ALLOC_ORDER                     \
 375 }
 376
 377 #else /* Better for fp code at expense of int code.  */
 378 #define REG_ALLOC_ORDER                         \
 379 {                                               \
 380    0,  1,  2,  3,  4,  5,  6,  7,  8,           \
 381    9, 10, 11, 12, 13, 14, 15, 16, 17, 18        \
 382   SUBTARGET_REG_ALLOC_ORDER                     \
 383 }
 384 #endif
 385
 386 #define HARD_REGNO_RENAME_OK(OLD_REG, NEW_REG) \
 387   m32r_hard_regno_rename_ok (OLD_REG, NEW_REG)
 388 \f
 389 /* Register classes and constants.  */
 390
 391 /* Define the classes of registers for register constraints in the
 392    machine description.  Also define ranges of constants.
 393
 394    One of the classes must always be named ALL_REGS and include all hard regs.
 395    If there is more than one class, another class must be named NO_REGS
 396    and contain no registers.
 397
 398    The name GENERAL_REGS must be the name of a class (or an alias for
 399    another name such as ALL_REGS).  This is the class of registers
 400    that is allowed by "g" or "r" in a register constraint.
 401    Also, registers outside this class are allocated only when
 402    instructions express preferences for them.
 403
 404    The classes must be numbered in nondecreasing order; that is,
 405    a larger-numbered class must never be contained completely
 406    in a smaller-numbered class.
 407
 408    For any two classes, it is very desirable that there be another
 409    class that represents their union.
 410
 411    It is important that any condition codes have class NO_REGS.
 412    See `register_operand'.  */
 413
 414 enum reg_class
 415 {
 416   NO_REGS, CARRY_REG, ACCUM_REGS, GENERAL_REGS, ALL_REGS, LIM_REG_CLASSES
 417 };
 418
 419 #define N_REG_CLASSES ((int) LIM_REG_CLASSES)
 420
 421 /* Give names of register classes as strings for dump file.  */
 422 #define REG_CLASS_NAMES \
 423   { "NO_REGS", "CARRY_REG", "ACCUM_REGS", "GENERAL_REGS", "ALL_REGS" }
 424
 425 /* Define which registers fit in which classes.
 426    This is an initializer for a vector of HARD_REG_SET
 427    of length N_REG_CLASSES.  */
 428
 429 #ifndef SUBTARGET_REG_CLASS_CARRY
 430 #define SUBTARGET_REG_CLASS_CARRY 0
 431 #endif
 432
 433 #ifndef SUBTARGET_REG_CLASS_ACCUM
 434 #define SUBTARGET_REG_CLASS_ACCUM 0
 435 #endif
 436
 437 #ifndef SUBTARGET_REG_CLASS_GENERAL
 438 #define SUBTARGET_REG_CLASS_GENERAL 0
 439 #endif
 440
 441 #ifndef SUBTARGET_REG_CLASS_ALL
 442 #define SUBTARGET_REG_CLASS_ALL 0
 443 #endif
 444
 445 #define REG_CLASS_CONTENTS                                              \
 446 {                                                                       \
 447   { 0x00000 },                                                          \
 448   { 0x20000 | SUBTARGET_REG_CLASS_CARRY },                              \
 449   { 0x40000 | SUBTARGET_REG_CLASS_ACCUM },                              \
 450   { 0x1ffff | SUBTARGET_REG_CLASS_GENERAL },                            \
 451   { 0x7ffff | SUBTARGET_REG_CLASS_ALL },                                \
 452 }
 453
 454 /* The same information, inverted:
 455    Return the class number of the smallest class containing
 456    reg number REGNO.  This could be a conditional expression
 457    or could index an array.  */
 458 extern enum reg_class m32r_regno_reg_class[FIRST_PSEUDO_REGISTER];
 459 #define REGNO_REG_CLASS(REGNO) (m32r_regno_reg_class[REGNO])
 460
 461 /* The class value for index registers, and the one for base regs.  */
 462 #define INDEX_REG_CLASS GENERAL_REGS
 463 #define BASE_REG_CLASS GENERAL_REGS
 464
 465 /* These assume that REGNO is a hard or pseudo reg number.
 466    They give nonzero only if REGNO is a hard reg of the suitable class
 467    or a pseudo reg currently allocated to a suitable hard reg.
 468    Since they use reg_renumber, they are safe only once reg_renumber
 469    has been allocated, which happens in reginfo.c during register
 470    allocation.  */
 471 #define REGNO_OK_FOR_BASE_P(REGNO) \
 472   ((REGNO) < FIRST_PSEUDO_REGISTER                      \
 473    ? GPR_P (REGNO) || (REGNO) == ARG_POINTER_REGNUM     \
 474    : GPR_P (reg_renumber[REGNO]))
 475
 476 #define REGNO_OK_FOR_INDEX_P(REGNO) REGNO_OK_FOR_BASE_P(REGNO)
 477
 478 /* Return true if a value is inside a range.  */
 479 #define IN_RANGE_P(VALUE, LOW, HIGH)                    \
 480   (((unsigned HOST_WIDE_INT)((VALUE) - (LOW)))          \
 481    <= ((unsigned HOST_WIDE_INT)((HIGH) - (LOW))))
 482
 483 /* Some range macros.  */
 484 #define INT16_P(X)     ((X) >= - 0x8000 && (X) <= 0x7fff)
 485 #define CMP_INT16_P(X) ((X) >= - 0x7fff && (X) <= 0x8000)
 486 #define UINT16_P(X)   (((unsigned HOST_WIDE_INT) (X)) <= 0x0000ffff)
 487 #define UINT24_P(X)   (((unsigned HOST_WIDE_INT) (X)) <= 0x00ffffff)
 488 \f
 489 /* Stack layout and stack pointer usage.  */
 490
 491 /* Define this macro if pushing a word onto the stack moves the stack
 492    pointer to a smaller address.  */
 493 #define STACK_GROWS_DOWNWARD 1
 494
 495 /* Offset from the stack pointer register to the first location at which
 496    outgoing arguments are placed.  */
 497 #define STACK_POINTER_OFFSET 0
 498
 499 /* Offset of first parameter from the argument pointer register value.  */
 500 #define FIRST_PARM_OFFSET(FNDECL) 0
 501
 502 /* Register to use for pushing function arguments.  */
 503 #define STACK_POINTER_REGNUM 15
 504
 505 /* Base register for access to local variables of the function.  */
 506 #define FRAME_POINTER_REGNUM 13
 507
 508 /* Base register for access to arguments of the function.  */
 509 #define ARG_POINTER_REGNUM 16
 510
 511 /* Register in which static-chain is passed to a function.
 512    This must not be a register used by the prologue.  */
 513 #define STATIC_CHAIN_REGNUM  7
 514
 515 /* These aren't official macros.  */
 516 #define PROLOGUE_TMP_REGNUM  4
 517 #define RETURN_ADDR_REGNUM  14
 518 /* #define GP_REGNUM        12 */
 519 #define CARRY_REGNUM        17
 520 #define ACCUM_REGNUM        18
 521 #define M32R_MAX_INT_REGS   16
 522
 523 #ifndef SUBTARGET_GPR_P
 524 #define SUBTARGET_GPR_P(REGNO) 0
 525 #endif
 526
 527 #ifndef SUBTARGET_ACCUM_P
 528 #define SUBTARGET_ACCUM_P(REGNO) 0
 529 #endif
 530
 531 #ifndef SUBTARGET_CARRY_P
 532 #define SUBTARGET_CARRY_P(REGNO) 0
 533 #endif
 534
 535 #define GPR_P(REGNO)   (IN_RANGE_P ((REGNO), 0, 15) || SUBTARGET_GPR_P (REGNO))
 536 #define ACCUM_P(REGNO) ((REGNO) == ACCUM_REGNUM || SUBTARGET_ACCUM_P (REGNO))
 537 #define CARRY_P(REGNO) ((REGNO) == CARRY_REGNUM || SUBTARGET_CARRY_P (REGNO))
 538 \f
 539 /* Eliminating the frame and arg pointers.  */
 540
 541 /* If defined, this macro specifies a table of register pairs used to
 542    eliminate unneeded registers that point into the stack frame.  If
 543    it is not defined, the only elimination attempted by the compiler
 544    is to replace references to the frame pointer with references to
 545    the stack pointer.
 546
 547    Note that the elimination of the argument pointer with the stack
 548    pointer is specified first since that is the preferred elimination.  */
 549
 550 #define ELIMINABLE_REGS                                 \
 551 {{ FRAME_POINTER_REGNUM, STACK_POINTER_REGNUM },        \
 552  { ARG_POINTER_REGNUM,   STACK_POINTER_REGNUM },        \
 553  { ARG_POINTER_REGNUM,   FRAME_POINTER_REGNUM }}
 554
 555 /* This macro returns the initial difference between the specified pair
 556    of registers.  */
 557
 558 #define INITIAL_ELIMINATION_OFFSET(FROM, TO, OFFSET)                            \
 559   do                                                                            \
 560     {                                                                           \
 561       int size = m32r_compute_frame_size (get_frame_size ());                   \
 562                                                                                 \
 563       if ((FROM) == FRAME_POINTER_REGNUM && (TO) == STACK_POINTER_REGNUM)       \
 564         (OFFSET) = 0;                                                           \
 565       else if ((FROM) == ARG_POINTER_REGNUM && (TO) == FRAME_POINTER_REGNUM)    \
 566         (OFFSET) = size - crtl->args.pretend_args_size;                 \
 567       else if ((FROM) == ARG_POINTER_REGNUM && (TO) == STACK_POINTER_REGNUM)    \
 568         (OFFSET) = size - crtl->args.pretend_args_size;                 \
 569       else                                                                      \
 570         gcc_unreachable ();                                                             \
 571     }                                                                           \
 572   while (0)
 573 \f
 574 /* Function argument passing.  */
 575
 576 /* If defined, the maximum amount of space required for outgoing
 577    arguments will be computed and placed into the variable
 578    `crtl->outgoing_args_size'.  No space will be pushed
 579    onto the stack for each call; instead, the function prologue should
 580    increase the stack frame size by this amount.  */
 581 #define ACCUMULATE_OUTGOING_ARGS 1
 582
 583 /* Define a data type for recording info about an argument list
 584    during the scan of that argument list.  This data type should
 585    hold all necessary information about the function itself
 586    and about the args processed so far, enough to enable macros
 587    such as FUNCTION_ARG to determine where the next arg should go.  */
 588 #define CUMULATIVE_ARGS int
 589
 590 /* Initialize a variable CUM of type CUMULATIVE_ARGS
 591    for a call to a function whose data type is FNTYPE.
 592    For a library call, FNTYPE is 0.  */
 593 #define INIT_CUMULATIVE_ARGS(CUM, FNTYPE, LIBNAME, INDIRECT, N_NAMED_ARGS) \
 594   ((CUM) = 0)
 595
 596 /* The number of registers used for parameter passing.  Local to this file.  */
 597 #define M32R_MAX_PARM_REGS 4
 598
 599 /* 1 if N is a possible register number for function argument passing.  */
 600 #define FUNCTION_ARG_REGNO_P(N) \
 601   ((unsigned) (N) < M32R_MAX_PARM_REGS)
 602
 603 \f
 604 /* Function results.  */
 605
 606 /* Tell GCC to use TARGET_RETURN_IN_MEMORY.  */
 607 #define DEFAULT_PCC_STRUCT_RETURN 0
 608 \f
 609 /* Function entry and exit.  */
 610
 611 /* Initialize data used by insn expanders.  This is called from
 612    init_emit, once for each function, before code is generated.  */
 613 #define INIT_EXPANDERS m32r_init_expanders ()
 614
 615 /* EXIT_IGNORE_STACK should be nonzero if, when returning from a function,
 616    the stack pointer does not matter.  The value is tested only in
 617    functions that have frame pointers.
 618    No definition is equivalent to always zero.  */
 619 #define EXIT_IGNORE_STACK 1
 620
 621 /* Output assembler code to FILE to increment profiler label # LABELNO
 622    for profiling a function entry.  */
 623 #undef  FUNCTION_PROFILER
 624 #define FUNCTION_PROFILER(FILE, LABELNO)                        \
 625   do                                                            \
 626     {                                                           \
 627       if (flag_pic)                                             \
 628         {                                                       \
 629           fprintf (FILE, "\tld24 r14,#mcount\n");               \
 630           fprintf (FILE, "\tadd r14,r12\n");                    \
 631           fprintf (FILE, "\tld r14,@r14\n");                    \
 632           fprintf (FILE, "\tjl r14\n");                         \
 633         }                                                       \
 634       else                                                      \
 635         {                                                       \
 636           if (TARGET_ADDR24)                                    \
 637             fprintf (FILE, "\tbl mcount\n");                    \
 638           else                                                  \
 639             {                                                   \
 640               fprintf (FILE, "\tseth r14,#high(mcount)\n");     \
 641               fprintf (FILE, "\tor3 r14,r14,#low(mcount)\n");   \
 642               fprintf (FILE, "\tjl r14\n");                     \
 643             }                                                   \
 644         }                                                       \
 645       fprintf (FILE, "\taddi sp,#4\n");                         \
 646     }                                                           \
 647   while (0)
 648 \f
 649 /* Trampolines.  */
 650
 651 /* On the M32R, the trampoline is:
 652
 653         mv      r7, lr   -> bl L1        ; 178e 7e01
 654 L1:     add3    r6, lr, #L2-L1           ; 86ae 000c (L2 - L1 = 12)
 655         mv      lr, r7   -> ld r7,@r6+   ; 1e87 27e6
 656         ld      r6, @r6  -> jmp r6       ; 26c6 1fc6
 657 L2:     .word STATIC
 658         .word FUNCTION  */
 659
 660 #ifndef CACHE_FLUSH_FUNC
 661 #define CACHE_FLUSH_FUNC "_flush_cache"
 662 #endif
 663 #ifndef CACHE_FLUSH_TRAP
 664 #define CACHE_FLUSH_TRAP 12
 665 #endif
 666
 667 /* Length in bytes of the trampoline for entering a nested function.  */
 668 #define TRAMPOLINE_SIZE 24
 669
 670 \f
 671 #define RETURN_ADDR_RTX(COUNT, FRAME) m32r_return_addr (COUNT)
 672
 673 #define INCOMING_RETURN_ADDR_RTX   gen_rtx_REG (Pmode, RETURN_ADDR_REGNUM)
 674
 675 /* Addressing modes, and classification of registers for them.  */
 676
 677 /* Maximum number of registers that can appear in a valid memory address.  */
 678 #define MAX_REGS_PER_ADDRESS 1
 679
 680 /* We have post-inc load and pre-dec,pre-inc store,
 681    but only for 4 byte vals.  */
 682 #define HAVE_PRE_DECREMENT  1
 683 #define HAVE_PRE_INCREMENT  1
 684 #define HAVE_POST_INCREMENT 1
 685
 686 /* Recognize any constant value that is a valid address.  */
 687 #define CONSTANT_ADDRESS_P(X)   \
 688   (    GET_CODE (X) == LABEL_REF  \
 689    ||  GET_CODE (X) == SYMBOL_REF \
 690    ||  CONST_INT_P (X)  \
 691    || (GET_CODE (X) == CONST      \
 692        && ! (flag_pic && ! m32r_legitimate_pic_operand_p (X))))
 693 \f
 694 /* Condition code usage.  */
 695
 696 /* Return nonzero if SELECT_CC_MODE will never return MODE for a
 697    floating point inequality comparison.  */
 698 #define REVERSIBLE_CC_MODE(MODE) 1 /*???*/
 699 \f
 700 /* Costs.  */
 701
 702 /* The cost of a branch insn.  */
 703 /* A value of 2 here causes GCC to avoid using branches in comparisons like
 704    while (a < N && a).  Branches aren't that expensive on the M32R so
 705    we define this as 1.  Defining it as 2 had a heavy hit in fp-bit.c.  */
 706 #define BRANCH_COST(speed_p, predictable_p) ((TARGET_BRANCH_COST) ? 2 : 1)
 707
 708 /* Nonzero if access to memory by bytes is slow and undesirable.
 709    For RISC chips, it means that access to memory by bytes is no
 710    better than access by words when possible, so grab a whole word
 711    and maybe make use of that.  */
 712 #define SLOW_BYTE_ACCESS 1
 713
 714 /* Define this macro if it is as good or better to call a constant
 715    function address than to call an address kept in a register.  */
 716 #define NO_FUNCTION_CSE 1
 717 \f
 718 /* Section selection.  */
 719
 720 #define TEXT_SECTION_ASM_OP     "\t.section .text"
 721 #define DATA_SECTION_ASM_OP     "\t.section .data"
 722 #define BSS_SECTION_ASM_OP      "\t.section .bss"
 723
 724 /* Define this macro if jump tables (for tablejump insns) should be
 725    output in the text section, along with the assembler instructions.
 726    Otherwise, the readonly data section is used.
 727    This macro is irrelevant if there is no separate readonly data section.  */
 728 #define JUMP_TABLES_IN_TEXT_SECTION (flag_pic)
 729 \f
 730 /* Position Independent Code.  */
 731
 732 /* The register number of the register used to address a table of static
 733    data addresses in memory.  In some cases this register is defined by a
 734    processor's ``application binary interface'' (ABI).  When this macro
 735    is defined, RTL is generated for this register once, as with the stack
 736    pointer and frame pointer registers.  If this macro is not defined, it
 737    is up to the machine-dependent files to allocate such a register (if
 738    necessary).  */
 739 #define PIC_OFFSET_TABLE_REGNUM 12
 740
 741 /* Define this macro if the register defined by PIC_OFFSET_TABLE_REGNUM is
 742    clobbered by calls.  Do not define this macro if PIC_OFFSET_TABLE_REGNUM
 743    is not defined.  */
 744 /* This register is call-saved on the M32R.  */
 745 /*#define PIC_OFFSET_TABLE_REG_CALL_CLOBBERED*/
 746
 747 /* A C expression that is nonzero if X is a legitimate immediate
 748    operand on the target machine when generating position independent code.
 749    You can assume that X satisfies CONSTANT_P, so you need not
 750    check this.  You can also assume `flag_pic' is true, so you need not
 751    check it either.  You need not define this macro if all constants
 752    (including SYMBOL_REF) can be immediate operands when generating
 753    position independent code.  */
 754 #define LEGITIMATE_PIC_OPERAND_P(X) m32r_legitimate_pic_operand_p (X)
 755 \f
 756 /* Control the assembler format that we output.  */
 757
 758 /* A C string constant describing how to begin a comment in the target
 759    assembler language.  The compiler assumes that the comment will
 760    end at the end of the line.  */
 761 #define ASM_COMMENT_START ";"
 762
 763 /* Output to assembler file text saying following lines
 764    may contain character constants, extra white space, comments, etc.  */
 765 #define ASM_APP_ON ""
 766
 767 /* Output to assembler file text saying following lines
 768    no longer contain unusual constructs.  */
 769 #define ASM_APP_OFF ""
 770
 771 /* Globalizing directive for a label.  */
 772 #define GLOBAL_ASM_OP "\t.global\t"
 773
 774 /* We do not use DBX_LINES_FUNCTION_RELATIVE or
 775    dbxout_stab_value_internal_label_diff here because
 776    we need to use .debugsym for the line label.  */
 777
 778 #define DBX_OUTPUT_SOURCE_LINE(file, line, counter)                     \
 779   do                                                                    \
 780     {                                                                   \
 781       const char * begin_label =                                        \
 782         XSTR (XEXP (DECL_RTL (current_function_decl), 0), 0);           \
 783       char label[64];                                                   \
 784       ASM_GENERATE_INTERNAL_LABEL (label, "LM", counter);               \
 785                                                                         \
 786       dbxout_begin_stabn_sline (line);                                  \
 787       assemble_name (file, label);                                      \
 788       putc ('-', file);                                                 \
 789       assemble_name (file, begin_label);                                \
 790       fputs ("\n\t.debugsym ", file);                                   \
 791       assemble_name (file, label);                                      \
 792       putc ('\n', file);                                                \
 793       counter += 1;                                                     \
 794      }                                                                  \
 795   while (0)
 796
 797 /* How to refer to registers in assembler output.
 798    This sequence is indexed by compiler's hard-register-number (see above).  */
 799 #ifndef SUBTARGET_REGISTER_NAMES
 800 #define SUBTARGET_REGISTER_NAMES
 801 #endif
 802
 803 #define REGISTER_NAMES                                  \
 804 {                                                       \
 805   "r0", "r1", "r2", "r3", "r4", "r5", "r6", "r7",       \
 806   "r8", "r9", "r10", "r11", "r12", "fp", "lr", "sp",    \
 807   "ap", "cbit", "a0"                                    \
 808   SUBTARGET_REGISTER_NAMES                              \
 809 }
 810
 811 /* If defined, a C initializer for an array of structures containing
 812    a name and a register number.  This macro defines additional names
 813    for hard registers, thus allowing the `asm' option in declarations
 814    to refer to registers using alternate names.  */
 815 #ifndef SUBTARGET_ADDITIONAL_REGISTER_NAMES
 816 #define SUBTARGET_ADDITIONAL_REGISTER_NAMES
 817 #endif
 818
 819 #define ADDITIONAL_REGISTER_NAMES       \
 820 {                                       \
 821   /*{ "gp", GP_REGNUM },*/              \
 822   { "r13", FRAME_POINTER_REGNUM },      \
 823   { "r14", RETURN_ADDR_REGNUM },        \
 824   { "r15", STACK_POINTER_REGNUM },      \
 825   SUBTARGET_ADDITIONAL_REGISTER_NAMES   \
 826 }
 827
 828 /* If defined, C string expressions to be used for the `%R', `%L',
 829    `%U', and `%I' options of `asm_fprintf' (see `final.c').  These
 830    are useful when a single `md' file must support multiple assembler
 831    formats.  In that case, the various `tm.h' files can define these
 832    macros differently.  */
 833 #define REGISTER_PREFIX         ""
 834 #define LOCAL_LABEL_PREFIX      ".L"
 835 #define USER_LABEL_PREFIX       ""
 836 #define IMMEDIATE_PREFIX        "#"
 837
 838 /* This is how to output an element of a case-vector that is absolute.  */
 839 #define ASM_OUTPUT_ADDR_VEC_ELT(FILE, VALUE)            \
 840    do                                                   \
 841      {                                                  \
 842        char label[30];                                  \
 843        ASM_GENERATE_INTERNAL_LABEL (label, "L", VALUE); \
 844        fprintf (FILE, "\t.word\t");                     \
 845        assemble_name (FILE, label);                     \
 846        fprintf (FILE, "\n");                            \
 847      }                                                  \
 848   while (0)
 849
 850 /* This is how to output an element of a case-vector that is relative.  */
 851 #define ASM_OUTPUT_ADDR_DIFF_ELT(FILE, BODY, VALUE, REL)\
 852   do                                                    \
 853     {                                                   \
 854       char label[30];                                   \
 855       ASM_GENERATE_INTERNAL_LABEL (label, "L", VALUE);  \
 856       fprintf (FILE, "\t.word\t");                      \
 857       assemble_name (FILE, label);                      \
 858       fprintf (FILE, "-");                              \
 859       ASM_GENERATE_INTERNAL_LABEL (label, "L", REL);    \
 860       assemble_name (FILE, label);                      \
 861       fprintf (FILE, "\n");                             \
 862     }                                                   \
 863   while (0)
 864
 865 /* The desired alignment for the location counter at the beginning
 866    of a loop.  */
 867 /* On the M32R, align loops to 32 byte boundaries (cache line size)
 868    if -malign-loops.  */
 869 #define LOOP_ALIGN(LABEL) ((TARGET_ALIGN_LOOPS \
 870                             ? align_flags (5) : align_flags ()))
 871
 872 /* Define this to be the maximum number of insns to move around when moving
 873    a loop test from the top of a loop to the bottom
 874    and seeing whether to duplicate it.  The default is thirty.
 875
 876    Loop unrolling currently doesn't like this optimization, so
 877    disable doing if we are unrolling loops and saving space.  */
 878 #define LOOP_TEST_THRESHOLD (optimize_size                              \
 879                              && !flag_unroll_loops                      \
 880                              && !flag_unroll_all_loops ? 2 : 30)
 881
 882 /* This is how to output an assembler line
 883    that says to advance the location counter
 884    to a multiple of 2**LOG bytes.  */
 885 /* .balign is used to avoid confusion.  */
 886 #define ASM_OUTPUT_ALIGN(FILE,LOG)                      \
 887   do                                                    \
 888     {                                                   \
 889       if ((LOG) != 0)                                   \
 890         fprintf (FILE, "\t.balign %d\n", 1 << (LOG));   \
 891     }                                                   \
 892   while (0)
 893
 894 /* Like `ASM_OUTPUT_COMMON' except takes the required alignment as a
 895    separate, explicit argument.  If you define this macro, it is used in
 896    place of `ASM_OUTPUT_COMMON', and gives you more flexibility in
 897    handling the required alignment of the variable.  The alignment is
 898    specified as the number of bits.  */
 899
 900 #define SCOMMON_ASM_OP "\t.scomm\t"
 901
 902 #undef  ASM_OUTPUT_ALIGNED_COMMON
 903 #define ASM_OUTPUT_ALIGNED_COMMON(FILE, NAME, SIZE, ALIGN)              \
 904   do                                                                    \
 905     {                                                                   \
 906       if (! TARGET_SDATA_NONE                                           \
 907           && (SIZE) > 0                                                 \
 908           && (SIZE) <= (unsigned HOST_WIDE_INT) g_switch_value)         \
 909         fprintf ((FILE), "%s", SCOMMON_ASM_OP);                         \
 910       else                                                              \
 911         fprintf ((FILE), "%s", COMMON_ASM_OP);                          \
 912       assemble_name ((FILE), (NAME));                                   \
 913       fprintf ((FILE), ",%u,%u\n", (int)(SIZE), (ALIGN) / BITS_PER_UNIT);\
 914     }                                                                   \
 915   while (0)
 916
 917 #define ASM_OUTPUT_ALIGNED_BSS(FILE, DECL, NAME, SIZE, ALIGN)           \
 918   do                                                                    \
 919     {                                                                   \
 920       if (! TARGET_SDATA_NONE                                           \
 921           && (SIZE) > 0                                                 \
 922           && (SIZE) <= (unsigned HOST_WIDE_INT) g_switch_value)         \
 923         switch_to_section (get_named_section (NULL, ".sbss", 0));       \
 924       else                                                              \
 925         switch_to_section (bss_section);                                \
 926       ASM_OUTPUT_ALIGN (FILE, floor_log2 (ALIGN / BITS_PER_UNIT));      \
 927       last_assemble_variable_decl = DECL;                               \
 928       ASM_DECLARE_OBJECT_NAME (FILE, NAME, DECL);                       \
 929       ASM_OUTPUT_SKIP (FILE, SIZE ? SIZE : 1);                          \
 930     }                                                                   \
 931   while (0)
 932 \f
 933 /* Debugging information.  */
 934
 935 /* Generate DBX and DWARF debugging information.  */
 936 #define DBX_DEBUGGING_INFO    1
 937 #define DWARF2_DEBUGGING_INFO 1
 938
 939 /* Use DWARF2 debugging info by default.  */
 940 #undef  PREFERRED_DEBUGGING_TYPE
 941 #define PREFERRED_DEBUGGING_TYPE DWARF2_DEBUG
 942
 943 /* Turn off splitting of long stabs.  */
 944 #define DBX_CONTIN_LENGTH 0
 945 \f
 946 /* Miscellaneous.  */
 947
 948 /* Specify the machine mode that this machine uses
 949    for the index in the tablejump instruction.  */
 950 #define CASE_VECTOR_MODE (flag_pic ? SImode : Pmode)
 951
 952 /* Define if operations between registers always perform the operation
 953    on the full register even if a narrower mode is specified.  */
 954 #define WORD_REGISTER_OPERATIONS 1
 955
 956 /* Define if loading in MODE, an integral mode narrower than BITS_PER_WORD
 957    will either zero-extend or sign-extend.  The value of this macro should
 958    be the code that says which one of the two operations is implicitly
 959    done, UNKNOWN if none.  */
 960 #define LOAD_EXTEND_OP(MODE) ZERO_EXTEND
 961
 962 /* Max number of bytes we can move from memory
 963    to memory in one reasonably fast instruction.  */
 964 #define MOVE_MAX 4
 965
 966 /* Define this to be nonzero if shift instructions ignore all but the low-order
 967    few bits.  */
 968 #define SHIFT_COUNT_TRUNCATED 1
 969
 970 /* Specify the machine mode that pointers have.
 971    After generation of rtl, the compiler makes no further distinction
 972    between pointers and any other objects of this machine mode.  */
 973 /* ??? The M32R doesn't have full 32-bit pointers, but making this PSImode has
 974    its own problems (you have to add extendpsisi2 and truncsipsi2).
 975    Try to avoid it.  */
 976 #define Pmode SImode
 977
 978 /* A function address in a call instruction.  */
 979 #define FUNCTION_MODE SImode
 980 \f
 981 /* M32R function types.  */
 982 enum m32r_function_type
 983 {
 984   M32R_FUNCTION_UNKNOWN, M32R_FUNCTION_NORMAL, M32R_FUNCTION_INTERRUPT
 985 };
 986
 987 #define M32R_INTERRUPT_P(TYPE) ((TYPE) == M32R_FUNCTION_INTERRUPT)
 988
 989 /* The maximum number of bytes to copy using pairs of load/store instructions.
 990    If a block is larger than this then a loop will be generated to copy
 991    MAX_MOVE_BYTES chunks at a time.  The value of 32 is a semi-arbitrary choice.
 992    A customer uses Dhrystome as their benchmark, and Dhrystone has a 31 byte
 993    string copy in it.  */
 994 #define MAX_MOVE_BYTES 32