gcc/expr.h

   1 /* Definitions for code generation pass of GNU compiler.
   2    Copyright (C) 1987, 91-98, 1999 Free Software Foundation, Inc.
   3
   4 This file is part of GNU CC.
   5
   6 GNU CC is free software; you can redistribute it and/or modify
   7 it under the terms of the GNU General Public License as published by
   8 the Free Software Foundation; either version 2, or (at your option)
   9 any later version.
  10
  11 GNU CC is distributed in the hope that it will be useful,
  12 but WITHOUT ANY WARRANTY; without even the implied warranty of
  13 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  14 GNU General Public License for more details.
  15
  16 You should have received a copy of the GNU General Public License
  17 along with GNU CC; see the file COPYING.  If not, write to
  18 the Free Software Foundation, 59 Temple Place - Suite 330,
  19 Boston, MA 02111-1307, USA.  */
  20
  21 /* The default branch cost is 1.  */
  22 #ifndef BRANCH_COST
  23 #define BRANCH_COST 1
  24 #endif
  25
  26 /* Macros to access the slots of a QUEUED rtx.
  27    Here rather than in rtl.h because only the expansion pass
  28    should ever encounter a QUEUED.  */
  29
  30 /* The variable for which an increment is queued.  */
  31 #define QUEUED_VAR(P) XEXP (P, 0)
  32 /* If the increment has been emitted, this is the insn
  33    that does the increment.  It is zero before the increment is emitted.
  34    If more than one insn is emitted, this is the first insn.  */
  35 #define QUEUED_INSN(P) XEXP (P, 1)
  36 /* If a pre-increment copy has been generated, this is the copy
  37    (it is a temporary reg).  Zero if no copy made yet.  */
  38 #define QUEUED_COPY(P) XEXP (P, 2)
  39 /* This is the body to use for the insn to do the increment.
  40    It is used to emit the increment.  */
  41 #define QUEUED_BODY(P) XEXP (P, 3)
  42 /* Next QUEUED in the queue.  */
  43 #define QUEUED_NEXT(P) XEXP (P, 4)
  44
  45 /* This is the 4th arg to `expand_expr'.
  46    EXPAND_SUM means it is ok to return a PLUS rtx or MULT rtx.
  47    EXPAND_INITIALIZER is similar but also record any labels on forced_labels.
  48    EXPAND_CONST_ADDRESS means it is ok to return a MEM whose address
  49     is a constant that is not a legitimate address.
  50    EXPAND_MEMORY_USE_* are explained below.  */
  51 enum expand_modifier {EXPAND_NORMAL, EXPAND_SUM,
  52                       EXPAND_CONST_ADDRESS, EXPAND_INITIALIZER,
  53                       EXPAND_MEMORY_USE_WO, EXPAND_MEMORY_USE_RW,
  54                       EXPAND_MEMORY_USE_BAD, EXPAND_MEMORY_USE_DONT};
  55
  56 /* Argument for chkr_* functions.
  57    MEMORY_USE_RO: the pointer reads memory.
  58    MEMORY_USE_WO: the pointer writes to memory.
  59    MEMORY_USE_RW: the pointer modifies memory (ie it reads and writes). An
  60                   example is (*ptr)++
  61    MEMORY_USE_BAD: use this if you don't know the behavior of the pointer, or
  62                    if you know there are no pointers.  Using an INDIRECT_REF
  63                    with MEMORY_USE_BAD will abort.
  64    MEMORY_USE_TW: just test for writing, without update.  Special.
  65    MEMORY_USE_DONT: the memory is neither read nor written.  This is used by
  66                    '->' and '.'.  */
  67 enum memory_use_mode {MEMORY_USE_BAD = 0, MEMORY_USE_RO = 1,
  68                       MEMORY_USE_WO = 2, MEMORY_USE_RW = 3,
  69                       MEMORY_USE_TW = 6, MEMORY_USE_DONT = 99};
  70
  71 /* List of labels that must never be deleted.  */
  72 extern rtx forced_labels;
  73
  74 /* List (chain of EXPR_LISTs) of pseudo-regs of SAVE_EXPRs.
  75    So we can mark them all live at the end of the function, if stupid.  */
  76 extern rtx save_expr_regs;
  77
  78 extern int current_function_calls_alloca;
  79 extern int current_function_outgoing_args_size;
  80
  81 /* This is the offset from the arg pointer to the place where the first
  82    anonymous arg can be found, if there is one.  */
  83 extern rtx current_function_arg_offset_rtx;
  84
  85 /* This is nonzero if the current function uses the constant pool.  */
  86 extern int current_function_uses_const_pool;
  87
  88 /* This is nonzero if the current function uses pic_offset_table_rtx.  */
  89 extern int current_function_uses_pic_offset_table;
  90
  91 /* The arg pointer hard register, or the pseudo into which it was copied.  */
  92 extern rtx current_function_internal_arg_pointer;
  93
  94 /* This is nonzero if memory access checking be enabled in the current
  95    function.  */
  96 extern int current_function_check_memory_usage;
  97
  98 /* Nonzero means stack pops must not be deferred, and deferred stack
  99    pops must not be output.  It is nonzero inside a function call,
 100    inside a conditional expression, inside a statement expression,
 101    and in other cases as well.  */
 102 extern int inhibit_defer_pop;
 103
 104 /* Number of function calls seen so far in current function.  */
 105
 106 extern int function_call_count;
 107
 108 /* List (chain of EXPR_LIST) of stack slots that hold the current handlers
 109    for nonlocal gotos.  There is one for every nonlocal label in the function;
 110    this list matches the one in nonlocal_labels.
 111    Zero when function does not have nonlocal labels.  */
 112
 113 extern rtx nonlocal_goto_handler_slots;
 114
 115 /* RTX for stack slot that holds the stack pointer value to restore
 116    for a nonlocal goto.
 117    Zero when function does not have nonlocal labels.  */
 118
 119 extern rtx nonlocal_goto_stack_level;
 120
 121 /* List (chain of TREE_LIST) of LABEL_DECLs for all nonlocal labels
 122    (labels to which there can be nonlocal gotos from nested functions)
 123    in this function.  */
 124
 125 #ifdef TREE_CODE   /* Don't lose if tree.h not included.  */
 126 extern tree nonlocal_labels;
 127 #endif
 128
 129 #define NO_DEFER_POP (inhibit_defer_pop += 1)
 130 #define OK_DEFER_POP (inhibit_defer_pop -= 1)
 131
 132 /* Number of units that we should eventually pop off the stack.
 133    These are the arguments to function calls that have already returned.  */
 134 extern int pending_stack_adjust;
 135
 136 /* When temporaries are created by TARGET_EXPRs, they are created at
 137    this level of temp_slot_level, so that they can remain allocated
 138    until no longer needed.  CLEANUP_POINT_EXPRs define the lifetime
 139    of TARGET_EXPRs.  */
 140 extern int target_temp_slot_level;
 141
 142 /* Current level for normal temporaries.  */
 143
 144 extern int temp_slot_level;
 145 \f
 146 #ifdef TREE_CODE /* Don't lose if tree.h not included.  */
 147 /* Structure to record the size of a sequence of arguments
 148    as the sum of a tree-expression and a constant.  */
 149
 150 struct args_size
 151 {
 152   HOST_WIDE_INT constant;
 153   tree var;
 154 };
 155 #endif
 156
 157 /* Add the value of the tree INC to the `struct args_size' TO.  */
 158
 159 #define ADD_PARM_SIZE(TO, INC)  \
 160 { tree inc = (INC);                             \
 161   if (TREE_CODE (inc) == INTEGER_CST)           \
 162     (TO).constant += TREE_INT_CST_LOW (inc);    \
 163   else if ((TO).var == 0)                       \
 164     (TO).var = inc;                             \
 165   else                                          \
 166     (TO).var = size_binop (PLUS_EXPR, (TO).var, inc); }
 167
 168 #define SUB_PARM_SIZE(TO, DEC)  \
 169 { tree dec = (DEC);                             \
 170   if (TREE_CODE (dec) == INTEGER_CST)           \
 171     (TO).constant -= TREE_INT_CST_LOW (dec);    \
 172   else if ((TO).var == 0)                       \
 173     (TO).var = size_binop (MINUS_EXPR, integer_zero_node, dec); \
 174   else                                          \
 175     (TO).var = size_binop (MINUS_EXPR, (TO).var, dec); }
 176
 177 /* Convert the implicit sum in a `struct args_size' into an rtx.  */
 178 #define ARGS_SIZE_RTX(SIZE)                                             \
 179 ((SIZE).var == 0 ? GEN_INT ((SIZE).constant)    \
 180  : expand_expr (size_binop (PLUS_EXPR, (SIZE).var,                      \
 181                             size_int ((SIZE).constant)),                \
 182                 NULL_RTX, VOIDmode, EXPAND_MEMORY_USE_BAD))
 183
 184 /* Convert the implicit sum in a `struct args_size' into a tree.  */
 185 #define ARGS_SIZE_TREE(SIZE)                                            \
 186 ((SIZE).var == 0 ? size_int ((SIZE).constant)                           \
 187  : size_binop (PLUS_EXPR, (SIZE).var, size_int ((SIZE).constant)))
 188
 189 /* Supply a default definition for FUNCTION_ARG_PADDING:
 190    usually pad upward, but pad short args downward on
 191    big-endian machines.  */
 192
 193 enum direction {none, upward, downward};  /* Value has this type.  */
 194
 195 #ifndef FUNCTION_ARG_PADDING
 196 #define FUNCTION_ARG_PADDING(MODE, TYPE)                                \
 197   (! BYTES_BIG_ENDIAN                                                   \
 198    ? upward                                                             \
 199    : (((MODE) == BLKmode                                                \
 200        ? ((TYPE) && TREE_CODE (TYPE_SIZE (TYPE)) == INTEGER_CST         \
 201           && int_size_in_bytes (TYPE) < (PARM_BOUNDARY / BITS_PER_UNIT)) \
 202        : GET_MODE_BITSIZE (MODE) < PARM_BOUNDARY)                       \
 203       ? downward : upward))
 204 #endif
 205
 206 /* Supply a default definition for FUNCTION_ARG_BOUNDARY.  Normally, we let
 207    FUNCTION_ARG_PADDING, which also pads the length, handle any needed
 208    alignment.  */
 209
 210 #ifndef FUNCTION_ARG_BOUNDARY
 211 #define FUNCTION_ARG_BOUNDARY(MODE, TYPE)       PARM_BOUNDARY
 212 #endif
 213
 214 /* Provide a default value for STRICT_ARGUMENT_NAMING.  */
 215 #ifndef STRICT_ARGUMENT_NAMING
 216 #define STRICT_ARGUMENT_NAMING 0
 217 #endif
 218
 219 /* Nonzero if we do not know how to pass TYPE solely in registers.
 220    We cannot do so in the following cases:
 221
 222    - if the type has variable size
 223    - if the type is marked as addressable (it is required to be constructed
 224      into the stack)
 225    - if the padding and mode of the type is such that a copy into a register
 226      would put it into the wrong part of the register.
 227
 228    Which padding can't be supported depends on the byte endianness.
 229
 230    A value in a register is implicitly padded at the most significant end.
 231    On a big-endian machine, that is the lower end in memory.
 232    So a value padded in memory at the upper end can't go in a register.
 233    For a little-endian machine, the reverse is true.  */
 234
 235 #ifndef MUST_PASS_IN_STACK
 236 #define MUST_PASS_IN_STACK(MODE,TYPE)                   \
 237   ((TYPE) != 0                                          \
 238    && (TREE_CODE (TYPE_SIZE (TYPE)) != INTEGER_CST      \
 239        || TREE_ADDRESSABLE (TYPE)                       \
 240        || ((MODE) == BLKmode                            \
 241            && ! ((TYPE) != 0 && TREE_CODE (TYPE_SIZE (TYPE)) == INTEGER_CST \
 242                  && 0 == (int_size_in_bytes (TYPE)      \
 243                           % (PARM_BOUNDARY / BITS_PER_UNIT))) \
 244            && (FUNCTION_ARG_PADDING (MODE, TYPE)        \
 245                == (BYTES_BIG_ENDIAN ? upward : downward)))))
 246 #endif
 247
 248 /* Nonzero if type TYPE should be returned in memory.
 249    Most machines can use the following default definition.  */
 250
 251 #ifndef RETURN_IN_MEMORY
 252 #define RETURN_IN_MEMORY(TYPE) (TYPE_MODE (TYPE) == BLKmode)
 253 #endif
 254
 255 /* Supply a default definition of STACK_SAVEAREA_MODE for emit_stack_save.
 256    Normally move_insn, so Pmode stack pointer.  */
 257
 258 #ifndef STACK_SAVEAREA_MODE
 259 #define STACK_SAVEAREA_MODE(LEVEL) Pmode
 260 #endif
 261
 262 /* Supply a default definition of STACK_SIZE_MODE for
 263    allocate_dynamic_stack_space.  Normally PLUS/MINUS, so word_mode.  */
 264
 265 #ifndef STACK_SIZE_MODE
 266 #define STACK_SIZE_MODE word_mode
 267 #endif
 268
 269 /* Provide default values for the macros controlling stack checking.  */
 270
 271 #ifndef STACK_CHECK_BUILTIN
 272 #define STACK_CHECK_BUILTIN 0
 273 #endif
 274
 275 /* The default interval is one page.  */
 276 #ifndef STACK_CHECK_PROBE_INTERVAL
 277 #define STACK_CHECK_PROBE_INTERVAL 4096
 278 #endif
 279
 280 /* The default is to do a store into the stack.  */
 281 #ifndef STACK_CHECK_PROBE_LOAD
 282 #define STACK_CHECK_PROBE_LOAD 0
 283 #endif
 284
 285 /* This value is arbitrary, but should be sufficient for most machines.  */
 286 #ifndef STACK_CHECK_PROTECT
 287 #define STACK_CHECK_PROTECT (75 * UNITS_PER_WORD)
 288 #endif
 289
 290 /* Make the maximum frame size be the largest we can and still only need
 291    one probe per function.  */
 292 #ifndef STACK_CHECK_MAX_FRAME_SIZE
 293 #define STACK_CHECK_MAX_FRAME_SIZE \
 294   (STACK_CHECK_PROBE_INTERVAL - UNITS_PER_WORD)
 295 #endif
 296
 297 /* This is arbitrary, but should be large enough everywhere.  */
 298 #ifndef STACK_CHECK_FIXED_FRAME_SIZE
 299 #define STACK_CHECK_FIXED_FRAME_SIZE (4 * UNITS_PER_WORD)
 300 #endif
 301
 302 /* Provide a reasonable default for the maximum size of an object to
 303    allocate in the fixed frame.  We may need to be able to make this
 304    controllable by the user at some point.  */
 305 #ifndef STACK_CHECK_MAX_VAR_SIZE
 306 #define STACK_CHECK_MAX_VAR_SIZE (STACK_CHECK_MAX_FRAME_SIZE / 100)
 307 #endif
 308 \f
 309 /* Optabs are tables saying how to generate insn bodies
 310    for various machine modes and numbers of operands.
 311    Each optab applies to one operation.
 312    For example, add_optab applies to addition.
 313
 314    The insn_code slot is the enum insn_code that says how to
 315    generate an insn for this operation on a particular machine mode.
 316    It is CODE_FOR_nothing if there is no such insn on the target machine.
 317
 318    The `lib_call' slot is the name of the library function that
 319    can be used to perform the operation.
 320
 321    A few optabs, such as move_optab and cmp_optab, are used
 322    by special code.  */
 323
 324 /* Everything that uses expr.h needs to define enum insn_code
 325    but we don't list it in the Makefile dependencies just for that.  */
 326 #include "insn-codes.h"
 327
 328 typedef struct optab
 329 {
 330   enum rtx_code code;
 331   struct {
 332     enum insn_code insn_code;
 333     rtx libfunc;
 334   } handlers [NUM_MACHINE_MODES];
 335 } * optab;
 336
 337 /* Given an enum insn_code, access the function to construct
 338    the body of that kind of insn.  */
 339 #ifdef FUNCTION_CONVERSION_BUG
 340 /* Some compilers fail to convert a function properly to a
 341    pointer-to-function when used as an argument.
 342    So produce the pointer-to-function directly.
 343    Luckily, these compilers seem to work properly when you
 344    call the pointer-to-function.  */
 345 #define GEN_FCN(CODE) (insn_gen_function[(int) (CODE)])
 346 #else
 347 #define GEN_FCN(CODE) (*insn_gen_function[(int) (CODE)])
 348 #endif
 349
 350 extern rtx (*const insn_gen_function[]) PROTO ((rtx, ...));
 351
 352 extern optab add_optab;
 353 extern optab sub_optab;
 354 extern optab smul_optab;        /* Signed and floating-point multiply */
 355 extern optab smul_highpart_optab; /* Signed multiply, return high word */
 356 extern optab umul_highpart_optab;
 357 extern optab smul_widen_optab;  /* Signed multiply with result
 358                                    one machine mode wider than args */
 359 extern optab umul_widen_optab;
 360 extern optab sdiv_optab;        /* Signed divide */
 361 extern optab sdivmod_optab;     /* Signed divide-and-remainder in one */
 362 extern optab udiv_optab;
 363 extern optab udivmod_optab;
 364 extern optab smod_optab;        /* Signed remainder */
 365 extern optab umod_optab;
 366 extern optab flodiv_optab;      /* Optab for floating divide. */
 367 extern optab ftrunc_optab;      /* Convert float to integer in float fmt */
 368 extern optab and_optab;         /* Logical and */
 369 extern optab ior_optab;         /* Logical or */
 370 extern optab xor_optab;         /* Logical xor */
 371 extern optab ashl_optab;        /* Arithmetic shift left */
 372 extern optab ashr_optab;        /* Arithmetic shift right */
 373 extern optab lshr_optab;        /* Logical shift right */
 374 extern optab rotl_optab;        /* Rotate left */
 375 extern optab rotr_optab;        /* Rotate right */
 376 extern optab smin_optab;        /* Signed and floating-point minimum value */
 377 extern optab smax_optab;        /* Signed and floating-point maximum value */
 378 extern optab umin_optab;        /* Unsigned minimum value */
 379 extern optab umax_optab;        /* Unsigned maximum value */
 380
 381 extern optab mov_optab;         /* Move instruction.  */
 382 extern optab movstrict_optab;   /* Move, preserving high part of register.  */
 383
 384 extern optab cmp_optab;         /* Compare insn; two operands.  */
 385 extern optab tst_optab;         /* tst insn; compare one operand against 0 */
 386
 387 /* Unary operations */
 388 extern optab neg_optab;         /* Negation */
 389 extern optab abs_optab;         /* Abs value */
 390 extern optab one_cmpl_optab;    /* Bitwise not */
 391 extern optab ffs_optab;         /* Find first bit set */
 392 extern optab sqrt_optab;        /* Square root */
 393 extern optab sin_optab;         /* Sine */
 394 extern optab cos_optab;         /* Cosine */
 395 extern optab strlen_optab;      /* String length */
 396
 397 /* Tables of patterns for extending one integer mode to another.  */
 398 extern enum insn_code extendtab[MAX_MACHINE_MODE][MAX_MACHINE_MODE][2];
 399
 400 /* Tables of patterns for converting between fixed and floating point. */
 401 extern enum insn_code fixtab[NUM_MACHINE_MODES][NUM_MACHINE_MODES][2];
 402 extern enum insn_code fixtrunctab[NUM_MACHINE_MODES][NUM_MACHINE_MODES][2];
 403 extern enum insn_code floattab[NUM_MACHINE_MODES][NUM_MACHINE_MODES][2];
 404
 405 /* Contains the optab used for each rtx code.  */
 406 extern optab code_to_optab[NUM_RTX_CODE + 1];
 407
 408 /* Passed to expand_binop and expand_unop to say which options to try to use
 409    if the requested operation can't be open-coded on the requisite mode.
 410    Either OPTAB_LIB or OPTAB_LIB_WIDEN says try using a library call.
 411    Either OPTAB_WIDEN or OPTAB_LIB_WIDEN says try using a wider mode.
 412    OPTAB_MUST_WIDEN says try widening and don't try anything else.  */
 413
 414 enum optab_methods
 415 {
 416   OPTAB_DIRECT,
 417   OPTAB_LIB,
 418   OPTAB_WIDEN,
 419   OPTAB_LIB_WIDEN,
 420   OPTAB_MUST_WIDEN
 421 };
 422
 423 /* SYMBOL_REF rtx's for the library functions that are called
 424    implicitly and not via optabs.  */
 425
 426 extern rtx extendsfdf2_libfunc;
 427 extern rtx extendsfxf2_libfunc;
 428 extern rtx extendsftf2_libfunc;
 429 extern rtx extenddfxf2_libfunc;
 430 extern rtx extenddftf2_libfunc;
 431
 432 extern rtx truncdfsf2_libfunc;
 433 extern rtx truncxfsf2_libfunc;
 434 extern rtx trunctfsf2_libfunc;
 435 extern rtx truncxfdf2_libfunc;
 436 extern rtx trunctfdf2_libfunc;
 437
 438 extern rtx memcpy_libfunc;
 439 extern rtx bcopy_libfunc;
 440 extern rtx memcmp_libfunc;
 441 extern rtx bcmp_libfunc;
 442 extern rtx memset_libfunc;
 443 extern rtx bzero_libfunc;
 444
 445 extern rtx throw_libfunc;
 446 extern rtx rethrow_libfunc;
 447 extern rtx sjthrow_libfunc;
 448 extern rtx sjpopnthrow_libfunc;
 449 extern rtx terminate_libfunc;
 450 extern rtx setjmp_libfunc;
 451 extern rtx longjmp_libfunc;
 452 extern rtx eh_rtime_match_libfunc;
 453
 454 extern rtx eqhf2_libfunc;
 455 extern rtx nehf2_libfunc;
 456 extern rtx gthf2_libfunc;
 457 extern rtx gehf2_libfunc;
 458 extern rtx lthf2_libfunc;
 459 extern rtx lehf2_libfunc;
 460
 461 extern rtx eqsf2_libfunc;
 462 extern rtx nesf2_libfunc;
 463 extern rtx gtsf2_libfunc;
 464 extern rtx gesf2_libfunc;
 465 extern rtx ltsf2_libfunc;
 466 extern rtx lesf2_libfunc;
 467
 468 extern rtx eqdf2_libfunc;
 469 extern rtx nedf2_libfunc;
 470 extern rtx gtdf2_libfunc;
 471 extern rtx gedf2_libfunc;
 472 extern rtx ltdf2_libfunc;
 473 extern rtx ledf2_libfunc;
 474
 475 extern rtx eqxf2_libfunc;
 476 extern rtx nexf2_libfunc;
 477 extern rtx gtxf2_libfunc;
 478 extern rtx gexf2_libfunc;
 479 extern rtx ltxf2_libfunc;
 480 extern rtx lexf2_libfunc;
 481
 482 extern rtx eqtf2_libfunc;
 483 extern rtx netf2_libfunc;
 484 extern rtx gttf2_libfunc;
 485 extern rtx getf2_libfunc;
 486 extern rtx lttf2_libfunc;
 487 extern rtx letf2_libfunc;
 488
 489 extern rtx floatsisf_libfunc;
 490 extern rtx floatdisf_libfunc;
 491 extern rtx floattisf_libfunc;
 492
 493 extern rtx floatsidf_libfunc;
 494 extern rtx floatdidf_libfunc;
 495 extern rtx floattidf_libfunc;
 496
 497 extern rtx floatsixf_libfunc;
 498 extern rtx floatdixf_libfunc;
 499 extern rtx floattixf_libfunc;
 500
 501 extern rtx floatsitf_libfunc;
 502 extern rtx floatditf_libfunc;
 503 extern rtx floattitf_libfunc;
 504
 505 extern rtx fixsfsi_libfunc;
 506 extern rtx fixsfdi_libfunc;
 507 extern rtx fixsfti_libfunc;
 508
 509 extern rtx fixdfsi_libfunc;
 510 extern rtx fixdfdi_libfunc;
 511 extern rtx fixdfti_libfunc;
 512
 513 extern rtx fixxfsi_libfunc;
 514 extern rtx fixxfdi_libfunc;
 515 extern rtx fixxfti_libfunc;
 516
 517 extern rtx fixtfsi_libfunc;
 518 extern rtx fixtfdi_libfunc;
 519 extern rtx fixtfti_libfunc;
 520
 521 extern rtx fixunssfsi_libfunc;
 522 extern rtx fixunssfdi_libfunc;
 523 extern rtx fixunssfti_libfunc;
 524
 525 extern rtx fixunsdfsi_libfunc;
 526 extern rtx fixunsdfdi_libfunc;
 527 extern rtx fixunsdfti_libfunc;
 528
 529 extern rtx fixunsxfsi_libfunc;
 530 extern rtx fixunsxfdi_libfunc;
 531 extern rtx fixunsxfti_libfunc;
 532
 533 extern rtx fixunstfsi_libfunc;
 534 extern rtx fixunstfdi_libfunc;
 535 extern rtx fixunstfti_libfunc;
 536
 537 /* For check-memory-usage.  */
 538 extern rtx chkr_check_addr_libfunc;
 539 extern rtx chkr_set_right_libfunc;
 540 extern rtx chkr_copy_bitmap_libfunc;
 541 extern rtx chkr_check_exec_libfunc;
 542 extern rtx chkr_check_str_libfunc;
 543
 544 /* For instrument-functions.  */
 545 extern rtx profile_function_entry_libfunc;
 546 extern rtx profile_function_exit_libfunc;
 547 \f
 548 typedef rtx (*rtxfun) PROTO ((rtx));
 549
 550 /* Indexed by the rtx-code for a conditional (eg. EQ, LT,...)
 551    gives the gen_function to make a branch to test that condition.  */
 552
 553 extern rtxfun bcc_gen_fctn[NUM_RTX_CODE];
 554
 555 /* Indexed by the rtx-code for a conditional (eg. EQ, LT,...)
 556    gives the insn code to make a store-condition insn
 557    to test that condition.  */
 558
 559 extern enum insn_code setcc_gen_code[NUM_RTX_CODE];
 560
 561 #ifdef HAVE_conditional_move
 562 /* Indexed by the machine mode, gives the insn code to make a conditional
 563    move insn.  */
 564
 565 extern enum insn_code movcc_gen_code[NUM_MACHINE_MODES];
 566 #endif
 567
 568 /* This array records the insn_code of insns to perform block moves.  */
 569 extern enum insn_code movstr_optab[NUM_MACHINE_MODES];
 570
 571 /* This array records the insn_code of insns to perform block clears.  */
 572 extern enum insn_code clrstr_optab[NUM_MACHINE_MODES];
 573
 574 /* Define functions given in optabs.c.  */
 575
 576 /* Expand a binary operation given optab and rtx operands.  */
 577 extern rtx expand_binop PROTO((enum machine_mode, optab, rtx, rtx, rtx,
 578                                int, enum optab_methods));
 579
 580 /* Expand a binary operation with both signed and unsigned forms.  */
 581 extern rtx sign_expand_binop PROTO((enum machine_mode, optab, optab, rtx,
 582                                     rtx, rtx, int, enum optab_methods));
 583
 584 /* Generate code to perform an operation on two operands with two results.  */
 585 extern int expand_twoval_binop PROTO((optab, rtx, rtx, rtx, rtx, int));
 586
 587 /* Expand a unary arithmetic operation given optab rtx operand.  */
 588 extern rtx expand_unop PROTO((enum machine_mode, optab, rtx, rtx, int));
 589
 590 /* Expand the absolute value operation.  */
 591 extern rtx expand_abs PROTO((enum machine_mode, rtx, rtx, int, int));
 592
 593 /* Expand the complex absolute value operation.  */
 594 extern rtx expand_complex_abs PROTO((enum machine_mode, rtx, rtx, int));
 595
 596 /* Generate an instruction with a given INSN_CODE with an output and
 597    an input.  */
 598 extern void emit_unop_insn PROTO((int, rtx, rtx, enum rtx_code));
 599
 600 /* Emit code to perform a series of operations on a multi-word quantity, one
 601    word at a time.  */
 602 extern rtx emit_no_conflict_block PROTO((rtx, rtx, rtx, rtx, rtx));
 603
 604 /* Emit code to make a call to a constant function or a library call. */
 605 extern void emit_libcall_block PROTO((rtx, rtx, rtx, rtx));
 606
 607 /* Emit one rtl instruction to store zero in specified rtx.  */
 608 extern void emit_clr_insn PROTO((rtx));
 609
 610 /* Emit one rtl insn to store 1 in specified rtx assuming it contains 0.  */
 611 extern void emit_0_to_1_insn PROTO((rtx));
 612
 613 /* Emit one rtl insn to compare two rtx's.  */
 614 extern void emit_cmp_insn PROTO((rtx, rtx, enum rtx_code, rtx,
 615                                  enum machine_mode, int, int));
 616
 617 /* Emit a pair of rtl insns to compare two rtx's and to jump
 618    to a label if the comparison is true.  */
 619 extern void emit_cmp_and_jump_insns PROTO((rtx, rtx, enum rtx_code, rtx,
 620                                            enum machine_mode, int, int, rtx));
 621
 622 /* Nonzero if a compare of mode MODE can be done straightforwardly
 623    (without splitting it into pieces).  */
 624 extern int can_compare_p PROTO((enum machine_mode));
 625
 626 /* Emit a library call comparison between floating point X and Y.
 627    COMPARISON is the rtl operator to compare with (EQ, NE, GT, etc.).  */
 628 extern void emit_float_lib_cmp PROTO((rtx, rtx, enum rtx_code));
 629
 630 /* Generate code to indirectly jump to a location given in the rtx LOC.  */
 631 extern void emit_indirect_jump PROTO((rtx));
 632
 633 #ifdef HAVE_conditional_move
 634 /* Emit a conditional move operation.  */
 635 rtx emit_conditional_move PROTO((rtx, enum rtx_code, rtx, rtx,
 636                                  enum machine_mode, rtx, rtx,
 637                                  enum machine_mode, int));
 638
 639 /* Return non-zero if the conditional move is supported.  */
 640 int can_conditionally_move_p PROTO((enum machine_mode mode));
 641
 642 #endif
 643
 644 /* Create but don't emit one rtl instruction to add one rtx into another.
 645    Modes must match; operands must meet the operation's predicates.
 646    Likewise for subtraction and for just copying.
 647    These do not call protect_from_queue; caller must do so.  */
 648 extern rtx gen_add2_insn PROTO((rtx, rtx));
 649 extern rtx gen_sub2_insn PROTO((rtx, rtx));
 650 extern rtx gen_move_insn PROTO((rtx, rtx));
 651 extern int have_add2_insn PROTO((enum machine_mode));
 652 extern int have_sub2_insn PROTO((enum machine_mode));
 653
 654 /* Return the INSN_CODE to use for an extend operation.  */
 655 extern enum insn_code can_extend_p PROTO((enum machine_mode,
 656                                           enum machine_mode, int));
 657
 658 /* Generate the body of an insn to extend Y (with mode MFROM)
 659    into X (with mode MTO).  Do zero-extension if UNSIGNEDP is nonzero.  */
 660 extern rtx gen_extend_insn PROTO((rtx, rtx, enum machine_mode,
 661                                   enum machine_mode, int));
 662
 663 /* Initialize the tables that control conversion between fixed and
 664    floating values.  */
 665 extern void init_fixtab PROTO((void));
 666 extern void init_floattab PROTO((void));
 667
 668 /* Generate code for a FLOAT_EXPR.  */
 669 extern void expand_float PROTO((rtx, rtx, int));
 670
 671 /* Generate code for a FIX_EXPR.  */
 672 extern void expand_fix PROTO((rtx, rtx, int));
 673
 674 /* Call this once to initialize the contents of the optabs
 675    appropriately for the current target machine.  */
 676 extern void init_optabs PROTO((void));
 677 \f
 678 /* Functions from expmed.c:  */
 679
 680 /* Arguments MODE, RTX: return an rtx for the negation of that value.
 681    May emit insns.  */
 682 extern rtx negate_rtx PROTO((enum machine_mode, rtx));
 683
 684 /* Expand a logical AND operation.  */
 685 extern rtx expand_and PROTO((rtx, rtx, rtx));
 686
 687 /* Emit a store-flag operation.  */
 688 extern rtx emit_store_flag PROTO((rtx, enum rtx_code, rtx, rtx,
 689                                   enum machine_mode, int, int));
 690
 691 /* Like emit_store_flag, but always succeeds.  */
 692 extern rtx emit_store_flag_force PROTO((rtx, enum rtx_code, rtx, rtx,
 693                                         enum machine_mode, int, int));
 694
 695 /* Functions from loop.c:  */
 696
 697 /* Given a JUMP_INSN, return a description of the test being made.  */
 698 extern rtx get_condition PROTO((rtx, rtx *));
 699
 700 /* Generate a conditional trap instruction.  */
 701 extern rtx gen_cond_trap PROTO((enum rtx_code, rtx, rtx, rtx));
 702 \f
 703 /* Functions from expr.c:  */
 704
 705 /* This is run once per compilation to set up which modes can be used
 706    directly in memory and to initialize the block move optab.  */
 707 extern void init_expr_once PROTO((void));
 708
 709 /* This is run at the start of compiling a function.  */
 710 extern void init_expr PROTO((void));
 711
 712 /* Use protect_from_queue to convert a QUEUED expression
 713    into something that you can put immediately into an instruction.  */
 714 extern rtx protect_from_queue PROTO((rtx, int));
 715
 716 /* Perform all the pending incrementations.  */
 717 extern void emit_queue PROTO((void));
 718
 719 /* Tell if something has a queued subexpression.  */
 720 extern int queued_subexp_p PROTO((rtx));
 721
 722 /* Emit some rtl insns to move data between rtx's, converting machine modes.
 723    Both modes must be floating or both fixed.  */
 724 extern void convert_move PROTO((rtx, rtx, int));
 725
 726 /* Convert an rtx to specified machine mode and return the result.  */
 727 extern rtx convert_to_mode PROTO((enum machine_mode, rtx, int));
 728
 729 /* Convert an rtx to MODE from OLDMODE and return the result.  */
 730 extern rtx convert_modes PROTO((enum machine_mode, enum machine_mode, rtx, int));
 731
 732 /* Emit code to move a block Y to a block X.  */
 733 extern rtx emit_block_move PROTO((rtx, rtx, rtx, int));
 734
 735 /* Copy all or part of a value X into registers starting at REGNO.
 736    The number of registers to be filled is NREGS.  */
 737 extern void move_block_to_reg PROTO((int, rtx, int, enum machine_mode));
 738
 739 /* Copy all or part of a BLKmode value X out of registers starting at REGNO.
 740    The number of registers to be filled is NREGS.  */
 741 extern void move_block_from_reg PROTO((int, rtx, int, int));
 742
 743 /* Load a BLKmode value into non-consecutive registers represented by a
 744    PARALLEL.  */
 745 extern void emit_group_load PROTO((rtx, rtx, int, int));
 746 /* Store a BLKmode value from non-consecutive registers represented by a
 747    PARALLEL.  */
 748 extern void emit_group_store PROTO((rtx, rtx, int, int));
 749
 750 #ifdef TREE_CODE
 751 /* Copy BLKmode object from a set of registers. */
 752 extern rtx copy_blkmode_from_reg PROTO((rtx,rtx,tree));
 753 #endif
 754
 755 /* Mark REG as holding a parameter for the next CALL_INSN.  */
 756 extern void use_reg PROTO((rtx *, rtx));
 757 /* Mark NREGS consecutive regs, starting at REGNO, as holding parameters
 758    for the next CALL_INSN.  */
 759 extern void use_regs PROTO((rtx *, int, int));
 760 /* Mark a PARALLEL as holding a parameter for the next CALL_INSN.  */
 761 extern void use_group_regs PROTO((rtx *, rtx));
 762
 763 /* Write zeros through the storage of OBJECT.
 764    If OBJECT has BLKmode, SIZE is its length in bytes and ALIGN is its
 765    alignment.  */
 766 extern rtx clear_storage PROTO((rtx, rtx, int));
 767
 768 /* Emit insns to set X from Y.  */
 769 extern rtx emit_move_insn PROTO((rtx, rtx));
 770
 771 /* Emit insns to set X from Y, with no frills.  */
 772 extern rtx emit_move_insn_1 PROTO ((rtx, rtx));
 773
 774 /* Push a block of length SIZE (perhaps variable)
 775    and return an rtx to address the beginning of the block.  */
 776 extern rtx push_block PROTO((rtx, int, int));
 777
 778 /* Make an operand to push something on the stack.  */
 779 extern rtx gen_push_operand PROTO((void));
 780
 781 #ifdef TREE_CODE
 782 /* Generate code to push something onto the stack, given its mode and type.  */
 783 extern void emit_push_insn PROTO((rtx, enum machine_mode, tree, rtx, int,
 784                                   int, rtx, int, rtx, rtx, int));
 785
 786 /* Emit library call.  */
 787 extern void emit_library_call PVPROTO((rtx orgfun, int no_queue,
 788   enum machine_mode outmode, int nargs, ...));
 789 extern rtx emit_library_call_value PVPROTO((rtx orgfun, rtx value, int no_queue,
 790   enum machine_mode outmode, int nargs, ...));
 791
 792 /* Expand an assignment that stores the value of FROM into TO. */
 793 extern rtx expand_assignment PROTO((tree, tree, int, int));
 794
 795 /* Generate code for computing expression EXP,
 796    and storing the value into TARGET.
 797    If SUGGEST_REG is nonzero, copy the value through a register
 798    and return that register, if that is possible.  */
 799 extern rtx store_expr PROTO((tree, rtx, int));
 800 #endif
 801
 802 /* Given an rtx that may include add and multiply operations,
 803    generate them as insns and return a pseudo-reg containing the value.
 804    Useful after calling expand_expr with 1 as sum_ok.  */
 805 extern rtx force_operand PROTO((rtx, rtx));
 806
 807 extern rtx expand_builtin_setjmp PROTO((rtx, rtx, rtx, rtx));
 808
 809 #ifdef TREE_CODE
 810 /* Generate code for computing expression EXP.
 811    An rtx for the computed value is returned.  The value is never null.
 812    In the case of a void EXP, const0_rtx is returned.  */
 813 extern rtx expand_expr PROTO((tree, rtx, enum machine_mode,
 814                               enum expand_modifier));
 815 #endif
 816
 817 /* At the start of a function, record that we have no previously-pushed
 818    arguments waiting to be popped.  */
 819 extern void init_pending_stack_adjust PROTO((void));
 820
 821 /* When exiting from function, if safe, clear out any pending stack adjust
 822    so the adjustment won't get done.  */
 823 extern void clear_pending_stack_adjust PROTO((void));
 824
 825 /* Pop any previously-pushed arguments that have not been popped yet.  */
 826 extern void do_pending_stack_adjust PROTO((void));
 827
 828 #ifdef TREE_CODE
 829 /* Generate code to evaluate EXP and jump to LABEL if the value is zero.  */
 830 extern void jumpifnot PROTO((tree, rtx));
 831
 832 /* Generate code to evaluate EXP and jump to LABEL if the value is nonzero.  */
 833 extern void jumpif PROTO((tree, rtx));
 834
 835 /* Generate code to evaluate EXP and jump to IF_FALSE_LABEL if
 836    the result is zero, or IF_TRUE_LABEL if the result is one.  */
 837 extern void do_jump PROTO((tree, rtx, rtx));
 838 #endif
 839
 840 /* Generate rtl to compare two rtx's, will call emit_cmp_insn.  */
 841 extern rtx compare_from_rtx PROTO((rtx, rtx, enum rtx_code, int,
 842                                    enum machine_mode, rtx, int));
 843
 844 /* Generate a tablejump instruction (used for switch statements).  */
 845 extern void do_tablejump PROTO((rtx, enum machine_mode, rtx, rtx, rtx));
 846 \f
 847 #ifdef TREE_CODE
 848 /* rtl.h and tree.h were included.  */
 849 /* Return an rtx for the size in bytes of the value of an expr.  */
 850 extern rtx expr_size PROTO((tree));
 851
 852 extern rtx lookup_static_chain PROTO((tree));
 853
 854 /* Convert a stack slot address ADDR valid in function FNDECL
 855    into an address valid in this function (using a static chain).  */
 856 extern rtx fix_lexical_addr PROTO((rtx, tree));
 857
 858 /* Return the address of the trampoline for entering nested fn FUNCTION.  */
 859 extern rtx trampoline_address PROTO((tree));
 860
 861 /* Return an rtx that refers to the value returned by a function
 862    in its original home.  This becomes invalid if any more code is emitted.  */
 863 extern rtx hard_function_value PROTO((tree, tree));
 864
 865 extern rtx prepare_call_address PROTO((rtx, tree, rtx *, int));
 866
 867 extern rtx expand_call PROTO((tree, rtx, int));
 868
 869 extern rtx expand_shift PROTO((enum tree_code, enum machine_mode, rtx, tree, rtx, int));
 870 extern rtx expand_divmod PROTO((int, enum tree_code, enum machine_mode, rtx, rtx, rtx, int));
 871 extern void locate_and_pad_parm PROTO((enum machine_mode, tree, int, tree, struct args_size *, struct args_size *, struct args_size *));
 872 extern rtx expand_inline_function PROTO((tree, tree, rtx, int, tree, rtx));
 873 /* Return the CODE_LABEL rtx for a LABEL_DECL, creating it if necessary.  */
 874 extern rtx label_rtx PROTO((tree));
 875 #endif
 876
 877 /* Indicate how an input argument register was promoted.  */
 878 extern rtx promoted_input_arg PROTO((int, enum machine_mode *, int *));
 879
 880 /* Return an rtx like arg but sans any constant terms.
 881    Returns the original rtx if it has no constant terms.
 882    The constant terms are added and stored via a second arg.  */
 883 extern rtx eliminate_constant_term PROTO((rtx, rtx *));
 884
 885 /* Convert arg to a valid memory address for specified machine mode,
 886    by emitting insns to perform arithmetic if nec.  */
 887 extern rtx memory_address PROTO((enum machine_mode, rtx));
 888
 889 /* Like `memory_address' but pretent `flag_force_addr' is 0.  */
 890 extern rtx memory_address_noforce PROTO((enum machine_mode, rtx));
 891
 892 /* Return a memory reference like MEMREF, but with its mode changed
 893    to MODE and its address changed to ADDR.
 894    (VOIDmode means don't change the mode.
 895    NULL for ADDR means don't change the address.)  */
 896 extern rtx change_address PROTO((rtx, enum machine_mode, rtx));
 897
 898 /* Return a memory reference like MEMREF, but which is known to have a
 899    valid address.  */
 900
 901 extern rtx validize_mem PROTO((rtx));
 902
 903 /* Assemble the static constant template for function entry trampolines.  */
 904 extern rtx assemble_trampoline_template PROTO((void));
 905
 906 /* Return 1 if two rtx's are equivalent in structure and elements.  */
 907 extern int rtx_equal_p PROTO((rtx, rtx));
 908
 909 /* Given rtx, return new rtx whose address won't be affected by
 910    any side effects.  It has been copied to a new temporary reg.  */
 911 extern rtx stabilize PROTO((rtx));
 912
 913 /* Given an rtx, copy all regs it refers to into new temps
 914    and return a modified copy that refers to the new temps.  */
 915 extern rtx copy_all_regs PROTO((rtx));
 916
 917 /* Copy given rtx to a new temp reg and return that.  */
 918 extern rtx copy_to_reg PROTO((rtx));
 919
 920 /* Like copy_to_reg but always make the reg Pmode.  */
 921 extern rtx copy_addr_to_reg PROTO((rtx));
 922
 923 /* Like copy_to_reg but always make the reg the specified mode MODE.  */
 924 extern rtx copy_to_mode_reg PROTO((enum machine_mode, rtx));
 925
 926 /* Copy given rtx to given temp reg and return that.  */
 927 extern rtx copy_to_suggested_reg PROTO((rtx, rtx, enum machine_mode));
 928
 929 /* Copy a value to a register if it isn't already a register.
 930    Args are mode (in case value is a constant) and the value.  */
 931 extern rtx force_reg PROTO((enum machine_mode, rtx));
 932
 933 /* Return given rtx, copied into a new temp reg if it was in memory.  */
 934 extern rtx force_not_mem PROTO((rtx));
 935
 936 #ifdef TREE_CODE
 937 /* Return mode and signedness to use when object is promoted.  */
 938 extern enum machine_mode promote_mode PROTO((tree, enum machine_mode,
 939                                              int *, int));
 940 #endif
 941
 942 /* Remove some bytes from the stack.  An rtx says how many.  */
 943 extern void adjust_stack PROTO((rtx));
 944
 945 /* Add some bytes to the stack.  An rtx says how many.  */
 946 extern void anti_adjust_stack PROTO((rtx));
 947
 948 /* This enum is used for the following two functions.  */
 949 enum save_level {SAVE_BLOCK, SAVE_FUNCTION, SAVE_NONLOCAL};
 950
 951 /* Save the stack pointer at the specified level.  */
 952 extern void emit_stack_save PROTO((enum save_level, rtx *, rtx));
 953
 954 /* Restore the stack pointer from a save area of the specified level.  */
 955 extern void emit_stack_restore PROTO((enum save_level, rtx, rtx));
 956
 957 /* Allocate some space on the stack dynamically and return its address.  An rtx
 958    says how many bytes.  */
 959 extern rtx allocate_dynamic_stack_space PROTO((rtx, rtx, int));
 960
 961 /* Probe a range of stack addresses from FIRST to FIRST+SIZE, inclusive.
 962    FIRST is a constant and size is a Pmode RTX.  These are offsets from the
 963    current stack pointer.  STACK_GROWS_DOWNWARD says whether to add or
 964    subtract from the stack.  If SIZE is constant, this is done
 965    with a fixed number of probes.  Otherwise, we must make a loop.  */
 966 extern void probe_stack_range PROTO((HOST_WIDE_INT, rtx));
 967
 968 /* Return an rtx that refers to the value returned by a library call
 969    in its original home.  This becomes invalid if any more code is emitted.  */
 970 extern rtx hard_libcall_value PROTO((enum machine_mode));
 971
 972 /* Given an rtx, return an rtx for a value rounded up to a multiple
 973    of STACK_BOUNDARY / BITS_PER_UNIT.  */
 974 extern rtx round_push PROTO((rtx));
 975
 976 extern rtx store_bit_field PROTO((rtx, int, int, enum machine_mode, rtx, int, int));
 977 extern rtx extract_bit_field PROTO((rtx, int, int, int, rtx, enum machine_mode, enum machine_mode, int, int));
 978 extern rtx expand_mult PROTO((enum machine_mode, rtx, rtx, rtx, int));
 979 extern rtx expand_mult_add PROTO((rtx, rtx, rtx, rtx,enum machine_mode, int));
 980 extern rtx expand_mult_highpart_adjust PROTO((enum machine_mode, rtx, rtx, rtx, rtx, int));
 981
 982 extern rtx assemble_static_space PROTO((int));
 983
 984 /* Hook called by expand_expr for language-specific tree codes.
 985    It is up to the language front end to install a hook
 986    if it has any such codes that expand_expr needs to know about.  */
 987 extern rtx (*lang_expand_expr) PROTO ((union tree_node *, rtx,
 988                                        enum machine_mode,
 989                                        enum expand_modifier modifier));
 990
 991 extern void init_all_optabs                     PROTO ((void));
 992 extern void init_mov_optab                      PROTO ((void));
 993 extern void do_jump_by_parts_equality_rtx       PROTO((rtx, rtx, rtx));
 994 extern void do_jump_by_parts_greater_rtx        PROTO ((enum machine_mode, int,
 995                                                         rtx, rtx, rtx, rtx));
 996
 997 #ifdef TREE_CODE   /* Don't lose if tree.h not included.  */
 998 extern void mark_seen_cases                     PROTO ((tree, unsigned char *,
 999                                                         long, int));
1000 #endif