gcc/expr.h

   1 /* Definitions for code generation pass of GNU compiler.
   2    Copyright (C) 1987, 91-97, 1998 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 /* Nonzero means stack pops must not be deferred, and deferred stack
  95    pops must not be output.  It is nonzero inside a function call,
  96    inside a conditional expression, inside a statement expression,
  97    and in other cases as well.  */
  98 extern int inhibit_defer_pop;
  99
 100 /* Number of function calls seen so far in current function.  */
 101
 102 extern int function_call_count;
 103
 104 /* RTX for stack slot that holds the current handler for nonlocal gotos.
 105    Zero when function does not have nonlocal labels.  */
 106
 107 extern rtx nonlocal_goto_handler_slot;
 108
 109 /* RTX for stack slot that holds the stack pointer value to restore
 110    for a nonlocal goto.
 111    Zero when function does not have nonlocal labels.  */
 112
 113 extern rtx nonlocal_goto_stack_level;
 114
 115 /* List (chain of TREE_LIST) of LABEL_DECLs for all nonlocal labels
 116    (labels to which there can be nonlocal gotos from nested functions)
 117    in this function.  */
 118
 119 #ifdef TREE_CODE   /* Don't lose if tree.h not included.  */
 120 extern tree nonlocal_labels;
 121 #endif
 122
 123 #define NO_DEFER_POP (inhibit_defer_pop += 1)
 124 #define OK_DEFER_POP (inhibit_defer_pop -= 1)
 125
 126 /* Number of units that we should eventually pop off the stack.
 127    These are the arguments to function calls that have already returned.  */
 128 extern int pending_stack_adjust;
 129
 130 /* When temporaries are created by TARGET_EXPRs, they are created at
 131    this level of temp_slot_level, so that they can remain allocated
 132    until no longer needed.  CLEANUP_POINT_EXPRs define the lifetime
 133    of TARGET_EXPRs.  */
 134 extern int target_temp_slot_level;
 135
 136 /* Current level for normal temporaries.  */
 137
 138 extern int temp_slot_level;
 139 \f
 140 #ifdef TREE_CODE /* Don't lose if tree.h not included.  */
 141 /* Structure to record the size of a sequence of arguments
 142    as the sum of a tree-expression and a constant.  */
 143
 144 struct args_size
 145 {
 146   HOST_WIDE_INT constant;
 147   tree var;
 148 };
 149 #endif
 150
 151 /* Add the value of the tree INC to the `struct args_size' TO.  */
 152
 153 #define ADD_PARM_SIZE(TO, INC)  \
 154 { tree inc = (INC);                             \
 155   if (TREE_CODE (inc) == INTEGER_CST)           \
 156     (TO).constant += TREE_INT_CST_LOW (inc);    \
 157   else if ((TO).var == 0)                       \
 158     (TO).var = inc;                             \
 159   else                                          \
 160     (TO).var = size_binop (PLUS_EXPR, (TO).var, inc); }
 161
 162 #define SUB_PARM_SIZE(TO, DEC)  \
 163 { tree dec = (DEC);                             \
 164   if (TREE_CODE (dec) == INTEGER_CST)           \
 165     (TO).constant -= TREE_INT_CST_LOW (dec);    \
 166   else if ((TO).var == 0)                       \
 167     (TO).var = size_binop (MINUS_EXPR, integer_zero_node, dec); \
 168   else                                          \
 169     (TO).var = size_binop (MINUS_EXPR, (TO).var, dec); }
 170
 171 /* Convert the implicit sum in a `struct args_size' into an rtx.  */
 172 #define ARGS_SIZE_RTX(SIZE)                                             \
 173 ((SIZE).var == 0 ? GEN_INT ((SIZE).constant)    \
 174  : expand_expr (size_binop (PLUS_EXPR, (SIZE).var,                      \
 175                             size_int ((SIZE).constant)),                \
 176                 NULL_RTX, VOIDmode, EXPAND_MEMORY_USE_BAD))
 177
 178 /* Convert the implicit sum in a `struct args_size' into a tree.  */
 179 #define ARGS_SIZE_TREE(SIZE)                                            \
 180 ((SIZE).var == 0 ? size_int ((SIZE).constant)                           \
 181  : size_binop (PLUS_EXPR, (SIZE).var, size_int ((SIZE).constant)))
 182
 183 /* Supply a default definition for FUNCTION_ARG_PADDING:
 184    usually pad upward, but pad short args downward on
 185    big-endian machines.  */
 186
 187 enum direction {none, upward, downward};  /* Value has this type.  */
 188
 189 #ifndef FUNCTION_ARG_PADDING
 190 #define FUNCTION_ARG_PADDING(MODE, TYPE)                                \
 191   (! BYTES_BIG_ENDIAN                                                   \
 192    ? upward                                                             \
 193    : (((MODE) == BLKmode                                                \
 194        ? ((TYPE) && TREE_CODE (TYPE_SIZE (TYPE)) == INTEGER_CST         \
 195           && int_size_in_bytes (TYPE) < (PARM_BOUNDARY / BITS_PER_UNIT)) \
 196        : GET_MODE_BITSIZE (MODE) < PARM_BOUNDARY)                       \
 197       ? downward : upward))
 198 #endif
 199
 200 /* Supply a default definition for FUNCTION_ARG_BOUNDARY.  Normally, we let
 201    FUNCTION_ARG_PADDING, which also pads the length, handle any needed
 202    alignment.  */
 203
 204 #ifndef FUNCTION_ARG_BOUNDARY
 205 #define FUNCTION_ARG_BOUNDARY(MODE, TYPE)       PARM_BOUNDARY
 206 #endif
 207
 208 /* Provide a default value for STRICT_ARGUMENT_NAMING.  */
 209 #ifndef STRICT_ARGUMENT_NAMING
 210 #define STRICT_ARGUMENT_NAMING 0
 211 #endif
 212
 213 /* Nonzero if we do not know how to pass TYPE solely in registers.
 214    We cannot do so in the following cases:
 215
 216    - if the type has variable size
 217    - if the type is marked as addressable (it is required to be constructed
 218      into the stack)
 219    - if the padding and mode of the type is such that a copy into a register
 220      would put it into the wrong part of the register.
 221
 222    Which padding can't be supported depends on the byte endianness.
 223
 224    A value in a register is implicitly padded at the most significant end.
 225    On a big-endian machine, that is the lower end in memory.
 226    So a value padded in memory at the upper end can't go in a register.
 227    For a little-endian machine, the reverse is true.  */
 228
 229 #ifndef MUST_PASS_IN_STACK
 230 #define MUST_PASS_IN_STACK(MODE,TYPE)                   \
 231   ((TYPE) != 0                                          \
 232    && (TREE_CODE (TYPE_SIZE (TYPE)) != INTEGER_CST      \
 233        || TREE_ADDRESSABLE (TYPE)                       \
 234        || ((MODE) == BLKmode                            \
 235            && ! ((TYPE) != 0 && TREE_CODE (TYPE_SIZE (TYPE)) == INTEGER_CST \
 236                  && 0 == (int_size_in_bytes (TYPE)      \
 237                           % (PARM_BOUNDARY / BITS_PER_UNIT))) \
 238            && (FUNCTION_ARG_PADDING (MODE, TYPE)        \
 239                == (BYTES_BIG_ENDIAN ? upward : downward)))))
 240 #endif
 241
 242 /* Nonzero if type TYPE should be returned in memory.
 243    Most machines can use the following default definition.  */
 244
 245 #ifndef RETURN_IN_MEMORY
 246 #define RETURN_IN_MEMORY(TYPE) (TYPE_MODE (TYPE) == BLKmode)
 247 #endif
 248
 249 /* Supply a default definition of STACK_SAVEAREA_MODE for emit_stack_save.
 250    Normally move_insn, so Pmode stack pointer.  */
 251
 252 #ifndef STACK_SAVEAREA_MODE
 253 #define STACK_SAVEAREA_MODE(LEVEL) Pmode
 254 #endif
 255
 256 /* Supply a default definition of STACK_SIZE_MODE for
 257    allocate_dynamic_stack_space.  Normally PLUS/MINUS, so word_mode.  */
 258
 259 #ifndef STACK_SIZE_MODE
 260 #define STACK_SIZE_MODE word_mode
 261 #endif
 262
 263 /* Provide default values for the macros controlling stack checking.  */
 264
 265 #ifndef STACK_CHECK_BUILTIN
 266 #define STACK_CHECK_BUILTIN 0
 267 #endif
 268
 269 /* The default interval is one page.  */
 270 #ifndef STACK_CHECK_PROBE_INTERVAL
 271 #define STACK_CHECK_PROBE_INTERVAL 4096
 272 #endif
 273
 274 /* The default is to do a store into the stack.  */
 275 #ifndef STACK_CHECK_PROBE_LOAD
 276 #define STACK_CHECK_PROBE_LOAD 0
 277 #endif
 278
 279 /* This value is arbitrary, but should be sufficient for most machines.  */
 280 #ifndef STACK_CHECK_PROTECT
 281 #define STACK_CHECK_PROTECT (75 * UNITS_PER_WORD)
 282 #endif
 283
 284 /* Make the maximum frame size be the largest we can and still only need
 285    one probe per function.  */
 286 #ifndef STACK_CHECK_MAX_FRAME_SIZE
 287 #define STACK_CHECK_MAX_FRAME_SIZE \
 288   (STACK_CHECK_PROBE_INTERVAL - UNITS_PER_WORD)
 289 #endif
 290
 291 /* This is arbitrary, but should be large enough everywhere.  */
 292 #ifndef STACK_CHECK_FIXED_FRAME_SIZE
 293 #define STACK_CHECK_FIXED_FRAME_SIZE (4 * UNITS_PER_WORD)
 294 #endif
 295
 296 /* Provide a reasonable default for the maximum size of an object to
 297    allocate in the fixed frame.  We may need to be able to make this
 298    controllable by the user at some point.  */
 299 #ifndef STACK_CHECK_MAX_VAR_SIZE
 300 #define STACK_CHECK_MAX_VAR_SIZE (STACK_CHECK_MAX_FRAME_SIZE / 100)
 301 #endif
 302 \f
 303 /* Optabs are tables saying how to generate insn bodies
 304    for various machine modes and numbers of operands.
 305    Each optab applies to one operation.
 306    For example, add_optab applies to addition.
 307
 308    The insn_code slot is the enum insn_code that says how to
 309    generate an insn for this operation on a particular machine mode.
 310    It is CODE_FOR_nothing if there is no such insn on the target machine.
 311
 312    The `lib_call' slot is the name of the library function that
 313    can be used to perform the operation.
 314
 315    A few optabs, such as move_optab and cmp_optab, are used
 316    by special code.  */
 317
 318 /* Everything that uses expr.h needs to define enum insn_code
 319    but we don't list it in the Makefile dependencies just for that.  */
 320 #include "insn-codes.h"
 321
 322 typedef struct optab
 323 {
 324   enum rtx_code code;
 325   struct {
 326     enum insn_code insn_code;
 327     rtx libfunc;
 328   } handlers [NUM_MACHINE_MODES];
 329 } * optab;
 330
 331 /* Given an enum insn_code, access the function to construct
 332    the body of that kind of insn.  */
 333 #ifdef FUNCTION_CONVERSION_BUG
 334 /* Some compilers fail to convert a function properly to a
 335    pointer-to-function when used as an argument.
 336    So produce the pointer-to-function directly.
 337    Luckily, these compilers seem to work properly when you
 338    call the pointer-to-function.  */
 339 #define GEN_FCN(CODE) (insn_gen_function[(int) (CODE)])
 340 #else
 341 #define GEN_FCN(CODE) (*insn_gen_function[(int) (CODE)])
 342 #endif
 343
 344 extern rtx (*const insn_gen_function[]) PROTO ((rtx, ...));
 345
 346 extern optab add_optab;
 347 extern optab sub_optab;
 348 extern optab smul_optab;        /* Signed and floating-point multiply */
 349 extern optab smul_highpart_optab; /* Signed multiply, return high word */
 350 extern optab umul_highpart_optab;
 351 extern optab smul_widen_optab;  /* Signed multiply with result
 352                                    one machine mode wider than args */
 353 extern optab umul_widen_optab;
 354 extern optab sdiv_optab;        /* Signed divide */
 355 extern optab sdivmod_optab;     /* Signed divide-and-remainder in one */
 356 extern optab udiv_optab;
 357 extern optab udivmod_optab;
 358 extern optab smod_optab;        /* Signed remainder */
 359 extern optab umod_optab;
 360 extern optab flodiv_optab;      /* Optab for floating divide. */
 361 extern optab ftrunc_optab;      /* Convert float to integer in float fmt */
 362 extern optab and_optab;         /* Logical and */
 363 extern optab ior_optab;         /* Logical or */
 364 extern optab xor_optab;         /* Logical xor */
 365 extern optab ashl_optab;        /* Arithmetic shift left */
 366 extern optab ashr_optab;        /* Arithmetic shift right */
 367 extern optab lshr_optab;        /* Logical shift right */
 368 extern optab rotl_optab;        /* Rotate left */
 369 extern optab rotr_optab;        /* Rotate right */
 370 extern optab smin_optab;        /* Signed and floating-point minimum value */
 371 extern optab smax_optab;        /* Signed and floating-point maximum value */
 372 extern optab umin_optab;        /* Unsigned minimum value */
 373 extern optab umax_optab;        /* Unsigned maximum value */
 374
 375 extern optab mov_optab;         /* Move instruction.  */
 376 extern optab movstrict_optab;   /* Move, preserving high part of register.  */
 377
 378 extern optab cmp_optab;         /* Compare insn; two operands.  */
 379 extern optab tst_optab;         /* tst insn; compare one operand against 0 */
 380
 381 /* Unary operations */
 382 extern optab neg_optab;         /* Negation */
 383 extern optab abs_optab;         /* Abs value */
 384 extern optab one_cmpl_optab;    /* Bitwise not */
 385 extern optab ffs_optab;         /* Find first bit set */
 386 extern optab sqrt_optab;        /* Square root */
 387 extern optab sin_optab;         /* Sine */
 388 extern optab cos_optab;         /* Cosine */
 389 extern optab strlen_optab;      /* String length */
 390
 391 /* Tables of patterns for extending one integer mode to another.  */
 392 extern enum insn_code extendtab[MAX_MACHINE_MODE][MAX_MACHINE_MODE][2];
 393
 394 /* Tables of patterns for converting between fixed and floating point. */
 395 extern enum insn_code fixtab[NUM_MACHINE_MODES][NUM_MACHINE_MODES][2];
 396 extern enum insn_code fixtrunctab[NUM_MACHINE_MODES][NUM_MACHINE_MODES][2];
 397 extern enum insn_code floattab[NUM_MACHINE_MODES][NUM_MACHINE_MODES][2];
 398
 399 /* Contains the optab used for each rtx code.  */
 400 extern optab code_to_optab[NUM_RTX_CODE + 1];
 401
 402 /* Passed to expand_binop and expand_unop to say which options to try to use
 403    if the requested operation can't be open-coded on the requisite mode.
 404    Either OPTAB_LIB or OPTAB_LIB_WIDEN says try using a library call.
 405    Either OPTAB_WIDEN or OPTAB_LIB_WIDEN says try using a wider mode.
 406    OPTAB_MUST_WIDEN says try widening and don't try anything else.  */
 407
 408 enum optab_methods
 409 {
 410   OPTAB_DIRECT,
 411   OPTAB_LIB,
 412   OPTAB_WIDEN,
 413   OPTAB_LIB_WIDEN,
 414   OPTAB_MUST_WIDEN
 415 };
 416
 417 /* SYMBOL_REF rtx's for the library functions that are called
 418    implicitly and not via optabs.  */
 419
 420 extern rtx extendsfdf2_libfunc;
 421 extern rtx extendsfxf2_libfunc;
 422 extern rtx extendsftf2_libfunc;
 423 extern rtx extenddfxf2_libfunc;
 424 extern rtx extenddftf2_libfunc;
 425
 426 extern rtx truncdfsf2_libfunc;
 427 extern rtx truncxfsf2_libfunc;
 428 extern rtx trunctfsf2_libfunc;
 429 extern rtx truncxfdf2_libfunc;
 430 extern rtx trunctfdf2_libfunc;
 431
 432 extern rtx memcpy_libfunc;
 433 extern rtx bcopy_libfunc;
 434 extern rtx memcmp_libfunc;
 435 extern rtx bcmp_libfunc;
 436 extern rtx memset_libfunc;
 437 extern rtx bzero_libfunc;
 438
 439 extern rtx throw_libfunc;
 440 extern rtx sjthrow_libfunc;
 441 extern rtx sjpopnthrow_libfunc;
 442 extern rtx terminate_libfunc;
 443 extern rtx setjmp_libfunc;
 444 extern rtx longjmp_libfunc;
 445
 446 extern rtx eqhf2_libfunc;
 447 extern rtx nehf2_libfunc;
 448 extern rtx gthf2_libfunc;
 449 extern rtx gehf2_libfunc;
 450 extern rtx lthf2_libfunc;
 451 extern rtx lehf2_libfunc;
 452
 453 extern rtx eqsf2_libfunc;
 454 extern rtx nesf2_libfunc;
 455 extern rtx gtsf2_libfunc;
 456 extern rtx gesf2_libfunc;
 457 extern rtx ltsf2_libfunc;
 458 extern rtx lesf2_libfunc;
 459
 460 extern rtx eqdf2_libfunc;
 461 extern rtx nedf2_libfunc;
 462 extern rtx gtdf2_libfunc;
 463 extern rtx gedf2_libfunc;
 464 extern rtx ltdf2_libfunc;
 465 extern rtx ledf2_libfunc;
 466
 467 extern rtx eqxf2_libfunc;
 468 extern rtx nexf2_libfunc;
 469 extern rtx gtxf2_libfunc;
 470 extern rtx gexf2_libfunc;
 471 extern rtx ltxf2_libfunc;
 472 extern rtx lexf2_libfunc;
 473
 474 extern rtx eqtf2_libfunc;
 475 extern rtx netf2_libfunc;
 476 extern rtx gttf2_libfunc;
 477 extern rtx getf2_libfunc;
 478 extern rtx lttf2_libfunc;
 479 extern rtx letf2_libfunc;
 480
 481 extern rtx floatsisf_libfunc;
 482 extern rtx floatdisf_libfunc;
 483 extern rtx floattisf_libfunc;
 484
 485 extern rtx floatsidf_libfunc;
 486 extern rtx floatdidf_libfunc;
 487 extern rtx floattidf_libfunc;
 488
 489 extern rtx floatsixf_libfunc;
 490 extern rtx floatdixf_libfunc;
 491 extern rtx floattixf_libfunc;
 492
 493 extern rtx floatsitf_libfunc;
 494 extern rtx floatditf_libfunc;
 495 extern rtx floattitf_libfunc;
 496
 497 extern rtx fixsfsi_libfunc;
 498 extern rtx fixsfdi_libfunc;
 499 extern rtx fixsfti_libfunc;
 500
 501 extern rtx fixdfsi_libfunc;
 502 extern rtx fixdfdi_libfunc;
 503 extern rtx fixdfti_libfunc;
 504
 505 extern rtx fixxfsi_libfunc;
 506 extern rtx fixxfdi_libfunc;
 507 extern rtx fixxfti_libfunc;
 508
 509 extern rtx fixtfsi_libfunc;
 510 extern rtx fixtfdi_libfunc;
 511 extern rtx fixtfti_libfunc;
 512
 513 extern rtx fixunssfsi_libfunc;
 514 extern rtx fixunssfdi_libfunc;
 515 extern rtx fixunssfti_libfunc;
 516
 517 extern rtx fixunsdfsi_libfunc;
 518 extern rtx fixunsdfdi_libfunc;
 519 extern rtx fixunsdfti_libfunc;
 520
 521 extern rtx fixunsxfsi_libfunc;
 522 extern rtx fixunsxfdi_libfunc;
 523 extern rtx fixunsxfti_libfunc;
 524
 525 extern rtx fixunstfsi_libfunc;
 526 extern rtx fixunstfdi_libfunc;
 527 extern rtx fixunstfti_libfunc;
 528
 529 /* For check-memory-usage.  */
 530 extern rtx chkr_check_addr_libfunc;
 531 extern rtx chkr_set_right_libfunc;
 532 extern rtx chkr_copy_bitmap_libfunc;
 533 extern rtx chkr_check_exec_libfunc;
 534 extern rtx chkr_check_str_libfunc;
 535
 536 /* For instrument-functions.  */
 537 extern rtx profile_function_entry_libfunc;
 538 extern rtx profile_function_exit_libfunc;
 539 \f
 540 typedef rtx (*rtxfun) PROTO ((rtx));
 541
 542 /* Indexed by the rtx-code for a conditional (eg. EQ, LT,...)
 543    gives the gen_function to make a branch to test that condition.  */
 544
 545 extern rtxfun bcc_gen_fctn[NUM_RTX_CODE];
 546
 547 /* Indexed by the rtx-code for a conditional (eg. EQ, LT,...)
 548    gives the insn code to make a store-condition insn
 549    to test that condition.  */
 550
 551 extern enum insn_code setcc_gen_code[NUM_RTX_CODE];
 552
 553 #ifdef HAVE_conditional_move
 554 /* Indexed by the machine mode, gives the insn code to make a conditional
 555    move insn.  */
 556
 557 extern enum insn_code movcc_gen_code[NUM_MACHINE_MODES];
 558 #endif
 559
 560 /* This array records the insn_code of insns to perform block moves.  */
 561 extern enum insn_code movstr_optab[NUM_MACHINE_MODES];
 562
 563 /* This array records the insn_code of insns to perform block clears.  */
 564 extern enum insn_code clrstr_optab[NUM_MACHINE_MODES];
 565
 566 /* Define functions given in optabs.c.  */
 567
 568 /* Expand a binary operation given optab and rtx operands.  */
 569 extern rtx expand_binop PROTO((enum machine_mode, optab, rtx, rtx, rtx,
 570                                int, enum optab_methods));
 571
 572 /* Expand a binary operation with both signed and unsigned forms.  */
 573 extern rtx sign_expand_binop PROTO((enum machine_mode, optab, optab, rtx,
 574                                     rtx, rtx, int, enum optab_methods));
 575
 576 /* Generate code to perform an operation on two operands with two results.  */
 577 extern int expand_twoval_binop PROTO((optab, rtx, rtx, rtx, rtx, int));
 578
 579 /* Expand a unary arithmetic operation given optab rtx operand.  */
 580 extern rtx expand_unop PROTO((enum machine_mode, optab, rtx, rtx, int));
 581
 582 /* Expand the absolute value operation.  */
 583 extern rtx expand_abs PROTO((enum machine_mode, rtx, rtx, int, int));
 584
 585 /* Expand the complex absolute value operation.  */
 586 extern rtx expand_complex_abs PROTO((enum machine_mode, rtx, rtx, int));
 587
 588 /* Generate an instruction with a given INSN_CODE with an output and
 589    an input.  */
 590 extern void emit_unop_insn PROTO((int, rtx, rtx, enum rtx_code));
 591
 592 /* Emit code to perform a series of operations on a multi-word quantity, one
 593    word at a time.  */
 594 extern rtx emit_no_conflict_block PROTO((rtx, rtx, rtx, rtx, rtx));
 595
 596 /* Emit code to make a call to a constant function or a library call. */
 597 extern void emit_libcall_block PROTO((rtx, rtx, rtx, rtx));
 598
 599 /* Emit one rtl instruction to store zero in specified rtx.  */
 600 extern void emit_clr_insn PROTO((rtx));
 601
 602 /* Emit one rtl insn to store 1 in specified rtx assuming it contains 0.  */
 603 extern void emit_0_to_1_insn PROTO((rtx));
 604
 605 /* Emit one rtl insn to compare two rtx's.  */
 606 extern void emit_cmp_insn PROTO((rtx, rtx, enum rtx_code, rtx,
 607                                  enum machine_mode, int, int));
 608
 609 /* Nonzero if a compare of mode MODE can be done straightforwardly
 610    (without splitting it into pieces).  */
 611 extern int can_compare_p PROTO((enum machine_mode));
 612
 613 /* Emit a library call comparison between floating point X and Y.
 614    COMPARISON is the rtl operator to compare with (EQ, NE, GT, etc.).  */
 615 extern void emit_float_lib_cmp PROTO((rtx, rtx, enum rtx_code));
 616
 617 /* Generate code to indirectly jump to a location given in the rtx LOC.  */
 618 extern void emit_indirect_jump PROTO((rtx));
 619
 620 #ifdef HAVE_conditional_move
 621 /* Emit a conditional move operation.  */
 622 rtx emit_conditional_move PROTO((rtx, enum rtx_code, rtx, rtx,
 623                                  enum machine_mode, rtx, rtx,
 624                                  enum machine_mode, int));
 625
 626 /* Return non-zero if the conditional move is supported.  */
 627 int can_conditionally_move_p PROTO((enum machine_mode mode));
 628
 629 #endif
 630
 631 /* Create but don't emit one rtl instruction to add one rtx into another.
 632    Modes must match; operands must meet the operation's predicates.
 633    Likewise for subtraction and for just copying.
 634    These do not call protect_from_queue; caller must do so.  */
 635 extern rtx gen_add2_insn PROTO((rtx, rtx));
 636 extern rtx gen_sub2_insn PROTO((rtx, rtx));
 637 extern rtx gen_move_insn PROTO((rtx, rtx));
 638 extern int have_add2_insn PROTO((enum machine_mode));
 639 extern int have_sub2_insn PROTO((enum machine_mode));
 640
 641 /* Return the INSN_CODE to use for an extend operation.  */
 642 extern enum insn_code can_extend_p PROTO((enum machine_mode,
 643                                           enum machine_mode, int));
 644
 645 /* Generate the body of an insn to extend Y (with mode MFROM)
 646    into X (with mode MTO).  Do zero-extension if UNSIGNEDP is nonzero.  */
 647 extern rtx gen_extend_insn PROTO((rtx, rtx, enum machine_mode,
 648                                   enum machine_mode, int));
 649
 650 /* Initialize the tables that control conversion between fixed and
 651    floating values.  */
 652 extern void init_fixtab PROTO((void));
 653 extern void init_floattab PROTO((void));
 654
 655 /* Generate code for a FLOAT_EXPR.  */
 656 extern void expand_float PROTO((rtx, rtx, int));
 657
 658 /* Generate code for a FIX_EXPR.  */
 659 extern void expand_fix PROTO((rtx, rtx, int));
 660
 661 /* Call this once to initialize the contents of the optabs
 662    appropriately for the current target machine.  */
 663 extern void init_optabs PROTO((void));
 664 \f
 665 /* Functions from expmed.c:  */
 666
 667 /* Arguments MODE, RTX: return an rtx for the negation of that value.
 668    May emit insns.  */
 669 extern rtx negate_rtx PROTO((enum machine_mode, rtx));
 670
 671 /* Expand a logical AND operation.  */
 672 extern rtx expand_and PROTO((rtx, rtx, rtx));
 673
 674 /* Emit a store-flag operation.  */
 675 extern rtx emit_store_flag PROTO((rtx, enum rtx_code, rtx, rtx,
 676                                   enum machine_mode, int, int));
 677
 678 /* Like emit_store_flag, but always succeeds.  */
 679 extern rtx emit_store_flag_force PROTO((rtx, enum rtx_code, rtx, rtx,
 680                                         enum machine_mode, int, int));
 681
 682 /* Functions from loop.c:  */
 683
 684 /* Given a JUMP_INSN, return a description of the test being made.  */
 685 extern rtx get_condition PROTO((rtx, rtx *));
 686
 687 /* Generate a conditional trap instruction.  */
 688 extern rtx gen_cond_trap PROTO((enum rtx_code, rtx, rtx, rtx));
 689 \f
 690 /* Functions from expr.c:  */
 691
 692 /* This is run once per compilation to set up which modes can be used
 693    directly in memory and to initialize the block move optab.  */
 694 extern void init_expr_once PROTO((void));
 695
 696 /* This is run at the start of compiling a function.  */
 697 extern void init_expr PROTO((void));
 698
 699 /* Use protect_from_queue to convert a QUEUED expression
 700    into something that you can put immediately into an instruction.  */
 701 extern rtx protect_from_queue PROTO((rtx, int));
 702
 703 /* Perform all the pending incrementations.  */
 704 extern void emit_queue PROTO((void));
 705
 706 /* Emit some rtl insns to move data between rtx's, converting machine modes.
 707    Both modes must be floating or both fixed.  */
 708 extern void convert_move PROTO((rtx, rtx, int));
 709
 710 /* Convert an rtx to specified machine mode and return the result.  */
 711 extern rtx convert_to_mode PROTO((enum machine_mode, rtx, int));
 712
 713 /* Convert an rtx to MODE from OLDMODE and return the result.  */
 714 extern rtx convert_modes PROTO((enum machine_mode, enum machine_mode, rtx, int));
 715
 716 /* Emit code to move a block Y to a block X.  */
 717 extern rtx emit_block_move PROTO((rtx, rtx, rtx, int));
 718
 719 /* Copy all or part of a value X into registers starting at REGNO.
 720    The number of registers to be filled is NREGS.  */
 721 extern void move_block_to_reg PROTO((int, rtx, int, enum machine_mode));
 722
 723 /* Copy all or part of a BLKmode value X out of registers starting at REGNO.
 724    The number of registers to be filled is NREGS.  */
 725 extern void move_block_from_reg PROTO((int, rtx, int, int));
 726
 727 /* Load a BLKmode value into non-consecutive registers represented by a
 728    PARALLEL.  */
 729 extern void emit_group_load PROTO((rtx, rtx, int, int));
 730 /* Store a BLKmode value from non-consecutive registers represented by a
 731    PARALLEL.  */
 732 extern void emit_group_store PROTO((rtx, rtx, int, int));
 733
 734 /* Mark REG as holding a parameter for the next CALL_INSN.  */
 735 extern void use_reg PROTO((rtx *, rtx));
 736 /* Mark NREGS consecutive regs, starting at REGNO, as holding parameters
 737    for the next CALL_INSN.  */
 738 extern void use_regs PROTO((rtx *, int, int));
 739 /* Mark a PARALLEL as holding a parameter for the next CALL_INSN.  */
 740 extern void use_group_regs PROTO((rtx *, rtx));
 741
 742 /* Write zeros through the storage of OBJECT.
 743    If OBJECT has BLKmode, SIZE is its length in bytes and ALIGN is its
 744    alignment.  */
 745 extern rtx clear_storage PROTO((rtx, rtx, int));
 746
 747 /* Emit insns to set X from Y.  */
 748 extern rtx emit_move_insn PROTO((rtx, rtx));
 749
 750 /* Emit insns to set X from Y, with no frills.  */
 751 extern rtx emit_move_insn_1 PROTO ((rtx, rtx));
 752
 753 /* Push a block of length SIZE (perhaps variable)
 754    and return an rtx to address the beginning of the block.  */
 755 extern rtx push_block PROTO((rtx, int, int));
 756
 757 /* Make an operand to push something on the stack.  */
 758 extern rtx gen_push_operand PROTO((void));
 759
 760 #ifdef TREE_CODE
 761 /* Generate code to push something onto the stack, given its mode and type.  */
 762 extern void emit_push_insn PROTO((rtx, enum machine_mode, tree, rtx, int,
 763                                   int, rtx, int, rtx, rtx, int));
 764
 765 /* Emit library call.  */
 766 extern void emit_library_call PVPROTO((rtx orgfun, int no_queue,
 767   enum machine_mode outmode, int nargs, ...));
 768 extern rtx emit_library_call_value PVPROTO((rtx orgfun, rtx value, int no_queue,
 769   enum machine_mode outmode, int nargs, ...));
 770
 771 /* Expand an assignment that stores the value of FROM into TO. */
 772 extern rtx expand_assignment PROTO((tree, tree, int, int));
 773
 774 /* Generate code for computing expression EXP,
 775    and storing the value into TARGET.
 776    If SUGGEST_REG is nonzero, copy the value through a register
 777    and return that register, if that is possible.  */
 778 extern rtx store_expr PROTO((tree, rtx, int));
 779 #endif
 780
 781 /* Given an rtx that may include add and multiply operations,
 782    generate them as insns and return a pseudo-reg containing the value.
 783    Useful after calling expand_expr with 1 as sum_ok.  */
 784 extern rtx force_operand PROTO((rtx, rtx));
 785
 786 extern rtx expand_builtin_setjmp PROTO((rtx, rtx, rtx, rtx));
 787
 788 #ifdef TREE_CODE
 789 /* Generate code for computing expression EXP.
 790    An rtx for the computed value is returned.  The value is never null.
 791    In the case of a void EXP, const0_rtx is returned.  */
 792 extern rtx expand_expr PROTO((tree, rtx, enum machine_mode,
 793                               enum expand_modifier));
 794 #endif
 795
 796 /* At the start of a function, record that we have no previously-pushed
 797    arguments waiting to be popped.  */
 798 extern void init_pending_stack_adjust PROTO((void));
 799
 800 /* When exiting from function, if safe, clear out any pending stack adjust
 801    so the adjustment won't get done.  */
 802 extern void clear_pending_stack_adjust PROTO((void));
 803
 804 /* Pop any previously-pushed arguments that have not been popped yet.  */
 805 extern void do_pending_stack_adjust PROTO((void));
 806
 807 #ifdef TREE_CODE
 808 /* Generate code to evaluate EXP and jump to LABEL if the value is zero.  */
 809 extern void jumpifnot PROTO((tree, rtx));
 810
 811 /* Generate code to evaluate EXP and jump to LABEL if the value is nonzero.  */
 812 extern void jumpif PROTO((tree, rtx));
 813
 814 /* Generate code to evaluate EXP and jump to IF_FALSE_LABEL if
 815    the result is zero, or IF_TRUE_LABEL if the result is one.  */
 816 extern void do_jump PROTO((tree, rtx, rtx));
 817 #endif
 818
 819 /* Generate rtl to compare two rtx's, will call emit_cmp_insn.  */
 820 extern rtx compare_from_rtx PROTO((rtx, rtx, enum rtx_code, int,
 821                                    enum machine_mode, rtx, int));
 822
 823 /* Generate a tablejump instruction (used for switch statements).  */
 824 extern void do_tablejump PROTO((rtx, enum machine_mode, rtx, rtx, rtx));
 825 \f
 826 #ifdef TREE_CODE
 827 /* rtl.h and tree.h were included.  */
 828 /* Return an rtx for the size in bytes of the value of an expr.  */
 829 extern rtx expr_size PROTO((tree));
 830
 831 extern rtx lookup_static_chain PROTO((tree));
 832
 833 /* Convert a stack slot address ADDR valid in function FNDECL
 834    into an address valid in this function (using a static chain).  */
 835 extern rtx fix_lexical_addr PROTO((rtx, tree));
 836
 837 /* Return the address of the trampoline for entering nested fn FUNCTION.  */
 838 extern rtx trampoline_address PROTO((tree));
 839
 840 /* Return an rtx that refers to the value returned by a function
 841    in its original home.  This becomes invalid if any more code is emitted.  */
 842 extern rtx hard_function_value PROTO((tree, tree));
 843
 844 extern rtx prepare_call_address PROTO((rtx, tree, rtx *, int));
 845
 846 extern rtx expand_call PROTO((tree, rtx, int));
 847
 848 extern rtx expand_shift PROTO((enum tree_code, enum machine_mode, rtx, tree, rtx, int));
 849 extern rtx expand_divmod PROTO((int, enum tree_code, enum machine_mode, rtx, rtx, rtx, int));
 850 extern void locate_and_pad_parm PROTO((enum machine_mode, tree, int, tree, struct args_size *, struct args_size *, struct args_size *));
 851 extern rtx expand_inline_function PROTO((tree, tree, rtx, int, tree, rtx));
 852 /* Return the CODE_LABEL rtx for a LABEL_DECL, creating it if necessary.  */
 853 extern rtx label_rtx PROTO((tree));
 854 #endif
 855
 856 /* Indicate how an input argument register was promoted.  */
 857 extern rtx promoted_input_arg PROTO((int, enum machine_mode *, int *));
 858
 859 /* Return an rtx like arg but sans any constant terms.
 860    Returns the original rtx if it has no constant terms.
 861    The constant terms are added and stored via a second arg.  */
 862 extern rtx eliminate_constant_term PROTO((rtx, rtx *));
 863
 864 /* Convert arg to a valid memory address for specified machine mode,
 865    by emitting insns to perform arithmetic if nec.  */
 866 extern rtx memory_address PROTO((enum machine_mode, rtx));
 867
 868 /* Like `memory_address' but pretent `flag_force_addr' is 0.  */
 869 extern rtx memory_address_noforce PROTO((enum machine_mode, rtx));
 870
 871 /* Return a memory reference like MEMREF, but with its mode changed
 872    to MODE and its address changed to ADDR.
 873    (VOIDmode means don't change the mode.
 874    NULL for ADDR means don't change the address.)  */
 875 extern rtx change_address PROTO((rtx, enum machine_mode, rtx));
 876
 877 /* Return a memory reference like MEMREF, but which is known to have a
 878    valid address.  */
 879
 880 extern rtx validize_mem PROTO((rtx));
 881
 882 /* Assemble the static constant template for function entry trampolines.  */
 883 extern rtx assemble_trampoline_template PROTO((void));
 884
 885 /* Return 1 if two rtx's are equivalent in structure and elements.  */
 886 extern int rtx_equal_p PROTO((rtx, rtx));
 887
 888 /* Given rtx, return new rtx whose address won't be affected by
 889    any side effects.  It has been copied to a new temporary reg.  */
 890 extern rtx stabilize PROTO((rtx));
 891
 892 /* Given an rtx, copy all regs it refers to into new temps
 893    and return a modified copy that refers to the new temps.  */
 894 extern rtx copy_all_regs PROTO((rtx));
 895
 896 /* Copy given rtx to a new temp reg and return that.  */
 897 extern rtx copy_to_reg PROTO((rtx));
 898
 899 /* Like copy_to_reg but always make the reg Pmode.  */
 900 extern rtx copy_addr_to_reg PROTO((rtx));
 901
 902 /* Like copy_to_reg but always make the reg the specified mode MODE.  */
 903 extern rtx copy_to_mode_reg PROTO((enum machine_mode, rtx));
 904
 905 /* Copy given rtx to given temp reg and return that.  */
 906 extern rtx copy_to_suggested_reg PROTO((rtx, rtx, enum machine_mode));
 907
 908 /* Copy a value to a register if it isn't already a register.
 909    Args are mode (in case value is a constant) and the value.  */
 910 extern rtx force_reg PROTO((enum machine_mode, rtx));
 911
 912 /* Return given rtx, copied into a new temp reg if it was in memory.  */
 913 extern rtx force_not_mem PROTO((rtx));
 914
 915 #ifdef TREE_CODE
 916 /* Return mode and signedness to use when object is promoted.  */
 917 extern enum machine_mode promote_mode PROTO((tree, enum machine_mode,
 918                                              int *, int));
 919 #endif
 920
 921 /* Remove some bytes from the stack.  An rtx says how many.  */
 922 extern void adjust_stack PROTO((rtx));
 923
 924 /* Add some bytes to the stack.  An rtx says how many.  */
 925 extern void anti_adjust_stack PROTO((rtx));
 926
 927 /* This enum is used for the following two functions.  */
 928 enum save_level {SAVE_BLOCK, SAVE_FUNCTION, SAVE_NONLOCAL};
 929
 930 /* Save the stack pointer at the specified level.  */
 931 extern void emit_stack_save PROTO((enum save_level, rtx *, rtx));
 932
 933 /* Restore the stack pointer from a save area of the specified level.  */
 934 extern void emit_stack_restore PROTO((enum save_level, rtx, rtx));
 935
 936 /* Allocate some space on the stack dynamically and return its address.  An rtx
 937    says how many bytes.  */
 938 extern rtx allocate_dynamic_stack_space PROTO((rtx, rtx, int));
 939
 940 /* Probe a range of stack addresses from FIRST to FIRST+SIZE, inclusive.
 941    FIRST is a constant and size is a Pmode RTX.  These are offsets from the
 942    current stack pointer.  STACK_GROWS_DOWNWARD says whether to add or
 943    subtract from the stack.  If SIZE is constant, this is done
 944    with a fixed number of probes.  Otherwise, we must make a loop.  */
 945 extern void probe_stack_range PROTO((HOST_WIDE_INT, rtx));
 946
 947 /* Return an rtx that refers to the value returned by a library call
 948    in its original home.  This becomes invalid if any more code is emitted.  */
 949 extern rtx hard_libcall_value PROTO((enum machine_mode));
 950
 951 /* Given an rtx, return an rtx for a value rounded up to a multiple
 952    of STACK_BOUNDARY / BITS_PER_UNIT.  */
 953 extern rtx round_push PROTO((rtx));
 954
 955 extern rtx store_bit_field PROTO((rtx, int, int, enum machine_mode, rtx, int, int));
 956 extern rtx extract_bit_field PROTO((rtx, int, int, int, rtx, enum machine_mode, enum machine_mode, int, int));
 957 extern rtx expand_mult PROTO((enum machine_mode, rtx, rtx, rtx, int));
 958 extern rtx expand_mult_add PROTO((rtx, rtx, rtx, rtx,enum machine_mode, int));
 959 extern rtx expand_mult_highpart_adjust PROTO((enum machine_mode, rtx, rtx, rtx, rtx, int));
 960
 961 extern rtx assemble_static_space PROTO((int));
 962
 963 /* Hook called by expand_expr for language-specific tree codes.
 964    It is up to the language front end to install a hook
 965    if it has any such codes that expand_expr needs to know about.  */
 966 extern rtx (*lang_expand_expr) PROTO ((union tree_node *, rtx,
 967                                        enum machine_mode,
 968                                        enum expand_modifier modifier));
 969
 970 extern void init_all_optabs                     PROTO ((void));
 971 extern void init_mov_optab                      PROTO ((void));
 972 extern void do_jump_by_parts_equality_rtx       PROTO((rtx, rtx, rtx));
 973 extern void do_jump_by_parts_greater_rtx        PROTO ((enum machine_mode, int,
 974                                                         rtx, rtx, rtx, rtx));
 975
 976 #ifdef TREE_CODE   /* Don't lose if tree.h not included.  */
 977 extern void mark_seen_cases                     PROTO ((tree, unsigned char *,
 978                                                         long, int));
 979 #endif