gcc/expr.h

   1 /* Definitions for code generation pass of GNU compiler.
   2    Copyright (C) 1987, 1991, 1992, 1993, 1994, 1995, 1996, 1997, 1998,
   3    1999, 2000 Free Software Foundation, Inc.
   4
   5 This file is part of GCC.
   6
   7 GCC is free software; you can redistribute it and/or modify it under
   8 the terms of the GNU General Public License as published by the Free
   9 Software Foundation; either version 2, or (at your option) any later
  10 version.
  11
  12 GCC is distributed in the hope that it will be useful, but WITHOUT ANY
  13 WARRANTY; without even the implied warranty of MERCHANTABILITY or
  14 FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
  15 for more details.
  16
  17 You should have received a copy of the GNU General Public License
  18 along with GCC; see the file COPYING.  If not, write to the Free
  19 Software Foundation, 59 Temple Place - Suite 330, Boston, MA
  20 02111-1307, USA.  */
  21
  22 /* The default branch cost is 1.  */
  23 #ifndef BRANCH_COST
  24 #define BRANCH_COST 1
  25 #endif
  26
  27 /* Macros to access the slots of a QUEUED rtx.
  28    Here rather than in rtl.h because only the expansion pass
  29    should ever encounter a QUEUED.  */
  30
  31 /* The variable for which an increment is queued.  */
  32 #define QUEUED_VAR(P) XEXP (P, 0)
  33 /* If the increment has been emitted, this is the insn
  34    that does the increment.  It is zero before the increment is emitted.
  35    If more than one insn is emitted, this is the first insn.  */
  36 #define QUEUED_INSN(P) XEXP (P, 1)
  37 /* If a pre-increment copy has been generated, this is the copy
  38    (it is a temporary reg).  Zero if no copy made yet.  */
  39 #define QUEUED_COPY(P) XEXP (P, 2)
  40 /* This is the body to use for the insn to do the increment.
  41    It is used to emit the increment.  */
  42 #define QUEUED_BODY(P) XEXP (P, 3)
  43 /* Next QUEUED in the queue.  */
  44 #define QUEUED_NEXT(P) XEXP (P, 4)
  45
  46 /* This is the 4th arg to `expand_expr'.
  47    EXPAND_SUM means it is ok to return a PLUS rtx or MULT rtx.
  48    EXPAND_INITIALIZER is similar but also record any labels on forced_labels.
  49    EXPAND_CONST_ADDRESS means it is ok to return a MEM whose address
  50     is a constant that is not a legitimate address.
  51    EXPAND_MEMORY_USE_* are explained below.  */
  52 enum expand_modifier {EXPAND_NORMAL, EXPAND_SUM,
  53                       EXPAND_CONST_ADDRESS, EXPAND_INITIALIZER,
  54                       EXPAND_MEMORY_USE_WO, EXPAND_MEMORY_USE_RW,
  55                       EXPAND_MEMORY_USE_BAD, EXPAND_MEMORY_USE_DONT};
  56
  57 /* Argument for chkr_* functions.
  58    MEMORY_USE_RO: the pointer reads memory.
  59    MEMORY_USE_WO: the pointer writes to memory.
  60    MEMORY_USE_RW: the pointer modifies memory (ie it reads and writes). An
  61                   example is (*ptr)++
  62    MEMORY_USE_BAD: use this if you don't know the behavior of the pointer, or
  63                    if you know there are no pointers.  Using an INDIRECT_REF
  64                    with MEMORY_USE_BAD will abort.
  65    MEMORY_USE_TW: just test for writing, without update.  Special.
  66    MEMORY_USE_DONT: the memory is neither read nor written.  This is used by
  67                    '->' and '.'.  */
  68 enum memory_use_mode {MEMORY_USE_BAD = 0, MEMORY_USE_RO = 1,
  69                       MEMORY_USE_WO = 2, MEMORY_USE_RW = 3,
  70                       MEMORY_USE_TW = 6, MEMORY_USE_DONT = 99};
  71
  72 /* Prevent the compiler from deferring stack pops.  See
  73    inhibit_defer_pop for more information.  */
  74 #define NO_DEFER_POP (inhibit_defer_pop += 1)
  75
  76 /* Allow the compiler to defer stack pops.  See inhibit_defer_pop for
  77    more information.  */
  78 #define OK_DEFER_POP (inhibit_defer_pop -= 1)
  79 \f
  80 #ifdef TREE_CODE /* Don't lose if tree.h not included.  */
  81 /* Structure to record the size of a sequence of arguments
  82    as the sum of a tree-expression and a constant.  This structure is
  83    also used to store offsets from the stack, which might be negative,
  84    so the variable part must be ssizetype, not sizetype.  */
  85
  86 struct args_size
  87 {
  88   HOST_WIDE_INT constant;
  89   tree var;
  90 };
  91 #endif
  92
  93 /* Add the value of the tree INC to the `struct args_size' TO.  */
  94
  95 #define ADD_PARM_SIZE(TO, INC)  \
  96 { tree inc = (INC);                             \
  97   if (host_integerp (inc, 0))                   \
  98     (TO).constant += tree_low_cst (inc, 0);     \
  99   else if ((TO).var == 0)                       \
 100     (TO).var = inc;                             \
 101   else                                          \
 102     (TO).var = size_binop (PLUS_EXPR, (TO).var, inc); }
 103
 104 #define SUB_PARM_SIZE(TO, DEC)  \
 105 { tree dec = (DEC);                             \
 106   if (host_integerp (dec, 0))                   \
 107     (TO).constant -= tree_low_cst (dec, 0);     \
 108   else if ((TO).var == 0)                       \
 109     (TO).var = size_binop (MINUS_EXPR, ssize_int (0), dec); \
 110   else                                          \
 111     (TO).var = size_binop (MINUS_EXPR, (TO).var, dec); }
 112
 113 /* Convert the implicit sum in a `struct args_size' into a tree
 114    of type ssizetype.  */
 115 #define ARGS_SIZE_TREE(SIZE)                                    \
 116 ((SIZE).var == 0 ? ssize_int ((SIZE).constant)                  \
 117  : size_binop (PLUS_EXPR, (SIZE).var, ssize_int ((SIZE).constant)))
 118
 119 /* Convert the implicit sum in a `struct args_size' into an rtx.  */
 120 #define ARGS_SIZE_RTX(SIZE)                                     \
 121 ((SIZE).var == 0 ? GEN_INT ((SIZE).constant)                    \
 122  : expand_expr (ARGS_SIZE_TREE (SIZE), NULL_RTX, VOIDmode,      \
 123                 EXPAND_MEMORY_USE_BAD))
 124
 125 /* Supply a default definition for FUNCTION_ARG_PADDING:
 126    usually pad upward, but pad short args downward on
 127    big-endian machines.  */
 128
 129 enum direction {none, upward, downward};  /* Value has this type.  */
 130
 131 #ifndef FUNCTION_ARG_PADDING
 132 #define FUNCTION_ARG_PADDING(MODE, TYPE)                                \
 133   (! BYTES_BIG_ENDIAN                                                   \
 134    ? upward                                                             \
 135    : (((MODE) == BLKmode                                                \
 136        ? ((TYPE) && TREE_CODE (TYPE_SIZE (TYPE)) == INTEGER_CST         \
 137           && int_size_in_bytes (TYPE) < (PARM_BOUNDARY / BITS_PER_UNIT)) \
 138        : GET_MODE_BITSIZE (MODE) < PARM_BOUNDARY)                       \
 139       ? downward : upward))
 140 #endif
 141
 142 /* Supply a default definition for FUNCTION_ARG_BOUNDARY.  Normally, we let
 143    FUNCTION_ARG_PADDING, which also pads the length, handle any needed
 144    alignment.  */
 145
 146 #ifndef FUNCTION_ARG_BOUNDARY
 147 #define FUNCTION_ARG_BOUNDARY(MODE, TYPE)       PARM_BOUNDARY
 148 #endif
 149
 150 /* Provide a default value for STRICT_ARGUMENT_NAMING.  */
 151 #ifndef STRICT_ARGUMENT_NAMING
 152 #define STRICT_ARGUMENT_NAMING 0
 153 #endif
 154
 155 /* Provide a default value for PRETEND_OUTGOING_VARARGS_NAMED.  */
 156 #ifdef SETUP_INCOMING_VARARGS
 157 #ifndef PRETEND_OUTGOING_VARARGS_NAMED
 158 #define PRETEND_OUTGOING_VARARGS_NAMED 1
 159 #endif
 160 #else
 161 /* It is an error to define PRETEND_OUTGOING_VARARGS_NAMED without
 162    defining SETUP_INCOMING_VARARGS.  */
 163 #define PRETEND_OUTGOING_VARARGS_NAMED 0
 164 #endif
 165
 166 /* Nonzero if we do not know how to pass TYPE solely in registers.
 167    We cannot do so in the following cases:
 168
 169    - if the type has variable size
 170    - if the type is marked as addressable (it is required to be constructed
 171      into the stack)
 172    - if the padding and mode of the type is such that a copy into a register
 173      would put it into the wrong part of the register.
 174
 175    Which padding can't be supported depends on the byte endianness.
 176
 177    A value in a register is implicitly padded at the most significant end.
 178    On a big-endian machine, that is the lower end in memory.
 179    So a value padded in memory at the upper end can't go in a register.
 180    For a little-endian machine, the reverse is true.  */
 181
 182 #ifndef MUST_PASS_IN_STACK
 183 #define MUST_PASS_IN_STACK(MODE,TYPE)                   \
 184   ((TYPE) != 0                                          \
 185    && (TREE_CODE (TYPE_SIZE (TYPE)) != INTEGER_CST      \
 186        || TREE_ADDRESSABLE (TYPE)                       \
 187        || ((MODE) == BLKmode                            \
 188            && ! ((TYPE) != 0 && TREE_CODE (TYPE_SIZE (TYPE)) == INTEGER_CST \
 189                  && 0 == (int_size_in_bytes (TYPE)      \
 190                           % (PARM_BOUNDARY / BITS_PER_UNIT))) \
 191            && (FUNCTION_ARG_PADDING (MODE, TYPE)        \
 192                == (BYTES_BIG_ENDIAN ? upward : downward)))))
 193 #endif
 194
 195 /* Nonzero if type TYPE should be returned in memory.
 196    Most machines can use the following default definition.  */
 197
 198 #ifndef RETURN_IN_MEMORY
 199 #define RETURN_IN_MEMORY(TYPE) (TYPE_MODE (TYPE) == BLKmode)
 200 #endif
 201
 202 /* Supply a default definition of STACK_SAVEAREA_MODE for emit_stack_save.
 203    Normally move_insn, so Pmode stack pointer.  */
 204
 205 #ifndef STACK_SAVEAREA_MODE
 206 #define STACK_SAVEAREA_MODE(LEVEL) Pmode
 207 #endif
 208
 209 /* Supply a default definition of STACK_SIZE_MODE for
 210    allocate_dynamic_stack_space.  Normally PLUS/MINUS, so word_mode.  */
 211
 212 #ifndef STACK_SIZE_MODE
 213 #define STACK_SIZE_MODE word_mode
 214 #endif
 215
 216 /* Provide default values for the macros controlling stack checking.  */
 217
 218 #ifndef STACK_CHECK_BUILTIN
 219 #define STACK_CHECK_BUILTIN 0
 220 #endif
 221
 222 /* The default interval is one page.  */
 223 #ifndef STACK_CHECK_PROBE_INTERVAL
 224 #define STACK_CHECK_PROBE_INTERVAL 4096
 225 #endif
 226
 227 /* The default is to do a store into the stack.  */
 228 #ifndef STACK_CHECK_PROBE_LOAD
 229 #define STACK_CHECK_PROBE_LOAD 0
 230 #endif
 231
 232 /* This value is arbitrary, but should be sufficient for most machines.  */
 233 #ifndef STACK_CHECK_PROTECT
 234 #define STACK_CHECK_PROTECT (75 * UNITS_PER_WORD)
 235 #endif
 236
 237 /* Make the maximum frame size be the largest we can and still only need
 238    one probe per function.  */
 239 #ifndef STACK_CHECK_MAX_FRAME_SIZE
 240 #define STACK_CHECK_MAX_FRAME_SIZE \
 241   (STACK_CHECK_PROBE_INTERVAL - UNITS_PER_WORD)
 242 #endif
 243
 244 /* This is arbitrary, but should be large enough everywhere.  */
 245 #ifndef STACK_CHECK_FIXED_FRAME_SIZE
 246 #define STACK_CHECK_FIXED_FRAME_SIZE (4 * UNITS_PER_WORD)
 247 #endif
 248
 249 /* Provide a reasonable default for the maximum size of an object to
 250    allocate in the fixed frame.  We may need to be able to make this
 251    controllable by the user at some point.  */
 252 #ifndef STACK_CHECK_MAX_VAR_SIZE
 253 #define STACK_CHECK_MAX_VAR_SIZE (STACK_CHECK_MAX_FRAME_SIZE / 100)
 254 #endif
 255 \f
 256 /* Functions from optabs.c, commonly used, and without need for the optabs
 257    tables:  */
 258
 259 /* Passed to expand_simple_binop and expand_binop to say which options
 260    to try to use if the requested operation can't be open-coded on the
 261    requisite mode.  Either OPTAB_LIB or OPTAB_LIB_WIDEN says try using
 262    a library call.  Either OPTAB_WIDEN or OPTAB_LIB_WIDEN says try
 263    using a wider mode.  OPTAB_MUST_WIDEN says try widening and don't
 264    try anything else.  */
 265
 266 enum optab_methods
 267 {
 268   OPTAB_DIRECT,
 269   OPTAB_LIB,
 270   OPTAB_WIDEN,
 271   OPTAB_LIB_WIDEN,
 272   OPTAB_MUST_WIDEN
 273 };
 274
 275 /* Generate code for a simple binary or unary operation.  "Simple" in
 276    this case means "can be unambiguously described by a (mode, code)
 277    pair and mapped to a single optab."  */
 278 extern rtx expand_simple_binop PARAMS ((enum machine_mode, enum rtx_code, rtx,
 279                                         rtx, rtx, int, enum optab_methods));
 280 extern rtx expand_simple_unop PARAMS ((enum machine_mode, enum rtx_code,
 281                                        rtx, rtx, int));
 282
 283 /* Report whether the machine description contains an insn which can
 284    perform the operation described by CODE and MODE.  */
 285 extern int have_insn_for PARAMS ((enum rtx_code, enum machine_mode));
 286
 287 /* Emit code to make a call to a constant function or a library call. */
 288 extern void emit_libcall_block PARAMS ((rtx, rtx, rtx, rtx));
 289
 290 /* Create but don't emit one rtl instruction to perform certain operations.
 291    Modes must match; operands must meet the operation's predicates.
 292    Likewise for subtraction and for just copying.
 293    These do not call protect_from_queue; caller must do so.  */
 294 extern rtx gen_add2_insn PARAMS ((rtx, rtx));
 295 extern rtx gen_add3_insn PARAMS ((rtx, rtx, rtx));
 296 extern rtx gen_sub2_insn PARAMS ((rtx, rtx));
 297 extern rtx gen_sub3_insn PARAMS ((rtx, rtx, rtx));
 298 extern rtx gen_move_insn PARAMS ((rtx, rtx));
 299 extern int have_add2_insn PARAMS ((rtx, rtx));
 300 extern int have_sub2_insn PARAMS ((rtx, rtx));
 301
 302 /* Emit a pair of rtl insns to compare two rtx's and to jump
 303    to a label if the comparison is true.  */
 304 extern void emit_cmp_and_jump_insns PARAMS ((rtx, rtx, enum rtx_code, rtx,
 305                                              enum machine_mode, int,
 306                                              unsigned int, rtx));
 307
 308 /* Generate code to indirectly jump to a location given in the rtx LOC.  */
 309 extern void emit_indirect_jump PARAMS ((rtx));
 310
 311 #ifdef HAVE_conditional_move
 312 /* Emit a conditional move operation.  */
 313 rtx emit_conditional_move PARAMS ((rtx, enum rtx_code, rtx, rtx,
 314                                    enum machine_mode, rtx, rtx,
 315                                    enum machine_mode, int));
 316
 317 /* Return non-zero if the conditional move is supported.  */
 318 int can_conditionally_move_p PARAMS ((enum machine_mode mode));
 319
 320 #endif
 321
 322 \f
 323 /* Functions from expmed.c:  */
 324
 325 /* Arguments MODE, RTX: return an rtx for the negation of that value.
 326    May emit insns.  */
 327 extern rtx negate_rtx PARAMS ((enum machine_mode, rtx));
 328
 329 /* Expand a logical AND operation.  */
 330 extern rtx expand_and PARAMS ((rtx, rtx, rtx));
 331
 332 /* Emit a store-flag operation.  */
 333 extern rtx emit_store_flag PARAMS ((rtx, enum rtx_code, rtx, rtx,
 334                                     enum machine_mode, int, int));
 335
 336 /* Like emit_store_flag, but always succeeds.  */
 337 extern rtx emit_store_flag_force PARAMS ((rtx, enum rtx_code, rtx, rtx,
 338                                           enum machine_mode, int, int));
 339
 340 /* Functions from loop.c:  */
 341
 342 /* Given an insn and condition, return a canonical description of
 343    the test being made.  */
 344 extern rtx canonicalize_condition PARAMS ((rtx, rtx, int, rtx *, rtx));
 345
 346 /* Given a JUMP_INSN, return a canonical description of the test
 347    being made.  */
 348 extern rtx get_condition PARAMS ((rtx, rtx *));
 349
 350 /* Generate a conditional trap instruction.  */
 351 extern rtx gen_cond_trap PARAMS ((enum rtx_code, rtx, rtx, rtx));
 352 \f
 353 /* Functions from builtins.c:  */
 354 #ifdef TREE_CODE
 355 extern rtx expand_builtin PARAMS ((tree, rtx, rtx, enum machine_mode, int));
 356 extern void std_expand_builtin_va_start PARAMS ((int, tree, rtx));
 357 extern rtx std_expand_builtin_va_arg PARAMS ((tree, tree));
 358 extern rtx expand_builtin_va_arg PARAMS ((tree, tree));
 359 extern void default_init_builtins PARAMS ((void));
 360 extern rtx default_expand_builtin PARAMS ((tree, rtx, rtx,
 361                                            enum machine_mode, int));
 362 #endif
 363
 364 extern void expand_builtin_setjmp_setup PARAMS ((rtx, rtx));
 365 extern void expand_builtin_setjmp_receiver PARAMS ((rtx));
 366 extern void expand_builtin_longjmp PARAMS ((rtx, rtx));
 367 extern rtx expand_builtin_saveregs PARAMS ((void));
 368 extern HOST_WIDE_INT get_varargs_alias_set PARAMS ((void));
 369 extern HOST_WIDE_INT get_frame_alias_set PARAMS ((void));
 370 extern void record_base_value           PARAMS ((unsigned int, rtx, int));
 371 extern void record_alias_subset         PARAMS ((HOST_WIDE_INT,
 372                                                  HOST_WIDE_INT));
 373 extern HOST_WIDE_INT new_alias_set              PARAMS ((void));
 374 \f
 375 /* Functions from expr.c:  */
 376
 377 /* This is run once per compilation to set up which modes can be used
 378    directly in memory and to initialize the block move optab.  */
 379 extern void init_expr_once PARAMS ((void));
 380
 381 /* This is run at the start of compiling a function.  */
 382 extern void init_expr PARAMS ((void));
 383
 384 /* This function is run once to initialize stor-layout.c.  */
 385
 386 extern void init_stor_layout_once PARAMS ((void));
 387
 388 /* This is run at the end of compiling a function.  */
 389 extern void finish_expr_for_function PARAMS ((void));
 390
 391 /* Use protect_from_queue to convert a QUEUED expression
 392    into something that you can put immediately into an instruction.  */
 393 extern rtx protect_from_queue PARAMS ((rtx, int));
 394
 395 /* Perform all the pending incrementations.  */
 396 extern void emit_queue PARAMS ((void));
 397
 398 /* Tell if something has a queued subexpression.  */
 399 extern int queued_subexp_p PARAMS ((rtx));
 400
 401 /* Emit some rtl insns to move data between rtx's, converting machine modes.
 402    Both modes must be floating or both fixed.  */
 403 extern void convert_move PARAMS ((rtx, rtx, int));
 404
 405 /* Convert an rtx to specified machine mode and return the result.  */
 406 extern rtx convert_to_mode PARAMS ((enum machine_mode, rtx, int));
 407
 408 /* Convert an rtx to MODE from OLDMODE and return the result.  */
 409 extern rtx convert_modes PARAMS ((enum machine_mode, enum machine_mode,
 410                                   rtx, int));
 411
 412 /* Emit code to move a block Y to a block X.  */
 413 extern rtx emit_block_move PARAMS ((rtx, rtx, rtx, unsigned int));
 414
 415 /* Copy all or part of a value X into registers starting at REGNO.
 416    The number of registers to be filled is NREGS.  */
 417 extern void move_block_to_reg PARAMS ((int, rtx, int, enum machine_mode));
 418
 419 /* Copy all or part of a BLKmode value X out of registers starting at REGNO.
 420    The number of registers to be filled is NREGS.  */
 421 extern void move_block_from_reg PARAMS ((int, rtx, int, int));
 422
 423 /* Load a BLKmode value into non-consecutive registers represented by a
 424    PARALLEL.  */
 425 extern void emit_group_load PARAMS ((rtx, rtx, int, unsigned int));
 426
 427 /* Store a BLKmode value from non-consecutive registers represented by a
 428    PARALLEL.  */
 429 extern void emit_group_store PARAMS ((rtx, rtx, int, unsigned int));
 430
 431 #ifdef TREE_CODE
 432 /* Copy BLKmode object from a set of registers. */
 433 extern rtx copy_blkmode_from_reg PARAMS ((rtx,rtx,tree));
 434 #endif
 435
 436 /* Mark REG as holding a parameter for the next CALL_INSN.  */
 437 extern void use_reg PARAMS ((rtx *, rtx));
 438
 439 /* Mark NREGS consecutive regs, starting at REGNO, as holding parameters
 440    for the next CALL_INSN.  */
 441 extern void use_regs PARAMS ((rtx *, int, int));
 442
 443 /* Mark a PARALLEL as holding a parameter for the next CALL_INSN.  */
 444 extern void use_group_regs PARAMS ((rtx *, rtx));
 445
 446 /* Write zeros through the storage of OBJECT.
 447    If OBJECT has BLKmode, SIZE is its length in bytes and ALIGN is its
 448    alignment.  */
 449 extern rtx clear_storage PARAMS ((rtx, rtx, unsigned int));
 450
 451 /* Return non-zero if it is desirable to store LEN bytes generated by
 452    CONSTFUN with several move instructions by store_by_pieces
 453    function.  CONSTFUNDATA is a pointer which will be passed as argument
 454    in every CONSTFUN call.
 455    ALIGN is maximum alignment we can assume.  */
 456 extern int can_store_by_pieces PARAMS ((unsigned HOST_WIDE_INT,
 457                                         rtx (*) (PTR, HOST_WIDE_INT,
 458                                                  enum machine_mode),
 459                                         PTR, unsigned int));
 460
 461 /* Generate several move instructions to store LEN bytes generated by
 462    CONSTFUN to block TO.  (A MEM rtx with BLKmode).  CONSTFUNDATA is a
 463    pointer which will be passed as argument in every CONSTFUN call.
 464    ALIGN is maximum alignment we can assume.  */
 465 extern void store_by_pieces PARAMS ((rtx, unsigned HOST_WIDE_INT,
 466                                      rtx (*) (PTR, HOST_WIDE_INT,
 467                                               enum machine_mode),
 468                                      PTR, unsigned int));
 469
 470 /* Emit insns to set X from Y.  */
 471 extern rtx emit_move_insn PARAMS ((rtx, rtx));
 472
 473 /* Emit insns to set X from Y, with no frills.  */
 474 extern rtx emit_move_insn_1 PARAMS ((rtx, rtx));
 475
 476 /* Push a block of length SIZE (perhaps variable)
 477    and return an rtx to address the beginning of the block.  */
 478 extern rtx push_block PARAMS ((rtx, int, int));
 479
 480 #ifdef TREE_CODE
 481 /* Generate code to push something onto the stack, given its mode and type.  */
 482 extern void emit_push_insn PARAMS ((rtx, enum machine_mode, tree, rtx,
 483                                     unsigned int, int, rtx, int, rtx, rtx,
 484                                     int, rtx));
 485
 486 /* Expand an assignment that stores the value of FROM into TO. */
 487 extern rtx expand_assignment PARAMS ((tree, tree, int, int));
 488
 489 /* Generate code for computing expression EXP,
 490    and storing the value into TARGET.
 491    If SUGGEST_REG is nonzero, copy the value through a register
 492    and return that register, if that is possible.  */
 493 extern rtx store_expr PARAMS ((tree, rtx, int));
 494 #endif
 495
 496 /* Given an rtx that may include add and multiply operations,
 497    generate them as insns and return a pseudo-reg containing the value.
 498    Useful after calling expand_expr with 1 as sum_ok.  */
 499 extern rtx force_operand PARAMS ((rtx, rtx));
 500
 501 #ifdef TREE_CODE
 502 /* Generate code for computing expression EXP.
 503    An rtx for the computed value is returned.  The value is never null.
 504    In the case of a void EXP, const0_rtx is returned.  */
 505 extern rtx expand_expr PARAMS ((tree, rtx, enum machine_mode,
 506                                 enum expand_modifier));
 507 #endif
 508
 509 /* At the start of a function, record that we have no previously-pushed
 510    arguments waiting to be popped.  */
 511 extern void init_pending_stack_adjust PARAMS ((void));
 512
 513 /* When exiting from function, if safe, clear out any pending stack adjust
 514    so the adjustment won't get done.  */
 515 extern void clear_pending_stack_adjust PARAMS ((void));
 516
 517 /* Pop any previously-pushed arguments that have not been popped yet.  */
 518 extern void do_pending_stack_adjust PARAMS ((void));
 519
 520 #ifdef TREE_CODE
 521 /* Return the tree node and offset if a given argument corresponds to
 522    a string constant.  */
 523 extern tree string_constant PARAMS ((tree, tree *));
 524
 525 /* Generate code to evaluate EXP and jump to LABEL if the value is zero.  */
 526 extern void jumpifnot PARAMS ((tree, rtx));
 527
 528 /* Generate code to evaluate EXP and jump to LABEL if the value is nonzero.  */
 529 extern void jumpif PARAMS ((tree, rtx));
 530
 531 /* Generate code to evaluate EXP and jump to IF_FALSE_LABEL if
 532    the result is zero, or IF_TRUE_LABEL if the result is one.  */
 533 extern void do_jump PARAMS ((tree, rtx, rtx));
 534 #endif
 535
 536 /* Generate rtl to compare two rtx's, will call emit_cmp_insn.  */
 537 extern rtx compare_from_rtx PARAMS ((rtx, rtx, enum rtx_code, int,
 538                                      enum machine_mode, rtx, unsigned int));
 539 extern void do_compare_rtx_and_jump PARAMS ((rtx, rtx, enum rtx_code, int,
 540                                              enum machine_mode, rtx,
 541                                              unsigned int, rtx, rtx));
 542
 543 /* Two different ways of generating switch statements.  */
 544 extern int try_casesi    PARAMS ((tree, tree, tree, tree, rtx, rtx));
 545 extern int try_tablejump PARAMS ((tree, tree, tree, tree, rtx, rtx));
 546
 547 /* Smallest number of adjacent cases before we use a jump table.
 548    XXX Should be a target hook.  */
 549 extern unsigned int case_values_threshold PARAMS ((void));
 550
 551 \f
 552 #ifdef TREE_CODE
 553 /* rtl.h and tree.h were included.  */
 554 /* Return an rtx for the size in bytes of the value of an expr.  */
 555 extern rtx expr_size PARAMS ((tree));
 556
 557 extern rtx lookup_static_chain PARAMS ((tree));
 558
 559 /* Convert a stack slot address ADDR valid in function FNDECL
 560    into an address valid in this function (using a static chain).  */
 561 extern rtx fix_lexical_addr PARAMS ((rtx, tree));
 562
 563 /* Return the address of the trampoline for entering nested fn FUNCTION.  */
 564 extern rtx trampoline_address PARAMS ((tree));
 565
 566 /* Return an rtx that refers to the value returned by a function
 567    in its original home.  This becomes invalid if any more code is emitted.  */
 568 extern rtx hard_function_value PARAMS ((tree, tree, int));
 569
 570 extern rtx prepare_call_address PARAMS ((rtx, tree, rtx *, int, int));
 571
 572 extern rtx expand_call PARAMS ((tree, rtx, int));
 573
 574 extern rtx expand_shift PARAMS ((enum tree_code, enum machine_mode, rtx, tree,
 575                                  rtx, int));
 576 extern rtx expand_divmod PARAMS ((int, enum tree_code, enum machine_mode, rtx,
 577                                   rtx, rtx, int));
 578 extern void locate_and_pad_parm PARAMS ((enum machine_mode, tree, int, tree,
 579                                          struct args_size *,
 580                                          struct args_size *,
 581                                          struct args_size *,
 582                                          struct args_size *));
 583 extern rtx expand_inline_function PARAMS ((tree, tree, rtx, int, tree, rtx));
 584
 585 /* Return the CODE_LABEL rtx for a LABEL_DECL, creating it if necessary.  */
 586 extern rtx label_rtx PARAMS ((tree));
 587 #endif
 588
 589 /* Indicate how an input argument register was promoted.  */
 590 extern rtx promoted_input_arg PARAMS ((unsigned int, enum machine_mode *,
 591                                        int *));
 592
 593 /* Return an rtx like arg but sans any constant terms.
 594    Returns the original rtx if it has no constant terms.
 595    The constant terms are added and stored via a second arg.  */
 596 extern rtx eliminate_constant_term PARAMS ((rtx, rtx *));
 597
 598 /* Convert arg to a valid memory address for specified machine mode,
 599    by emitting insns to perform arithmetic if nec.  */
 600 extern rtx memory_address PARAMS ((enum machine_mode, rtx));
 601
 602 /* Like `memory_address' but pretent `flag_force_addr' is 0.  */
 603 extern rtx memory_address_noforce PARAMS ((enum machine_mode, rtx));
 604
 605 /* Return a memory reference like MEMREF, but with its mode changed
 606    to MODE and its address changed to ADDR.
 607    (VOIDmode means don't change the mode.
 608    NULL for ADDR means don't change the address.)
 609    VALIDATE is nonzero if the returned memory location is required to be
 610    valid.  */
 611 extern rtx change_address_1 PARAMS ((rtx, enum machine_mode, rtx, int));
 612
 613 #define change_address(MEMREF, MODE, ADDR) \
 614   change_address_1 (MEMREF, MODE, ADDR, 1)
 615
 616 /* Return a memory reference like MEMREF, but with its mode changed
 617    to MODE and its address offset by OFFSET bytes.  */
 618 extern rtx adjust_address PARAMS ((rtx, enum machine_mode, HOST_WIDE_INT));
 619
 620 /* Likewise, but the reference is not required to be valid.  */
 621 extern rtx adjust_address_nv PARAMS ((rtx, enum machine_mode, HOST_WIDE_INT));
 622
 623 /* Return a memory reference like MEMREF, but with its address changed to
 624    ADDR.  The caller is asserting that the actual piece of memory pointed
 625    to is the same, just the form of the address is being changed, such as
 626    by putting something into a register.  */
 627 extern rtx replace_equiv_address PARAMS ((rtx, rtx));
 628
 629 /* Likewise, but the reference is not required to be valid.  */
 630 extern rtx replace_equiv_address_nv PARAMS ((rtx, rtx));
 631
 632 /* Return a memory reference like MEMREF, but which is known to have a
 633    valid address.  */
 634 extern rtx validize_mem PARAMS ((rtx));
 635
 636 #ifdef TREE_CODE
 637 /* Given REF, either a MEM or a REG, and T, either the type of X or
 638    the expression corresponding to REF, set RTX_UNCHANGING_P if
 639    appropriate.  */
 640 extern void maybe_set_unchanging PARAMS ((rtx, tree));
 641
 642 /* Given REF, a MEM, and T, either the type of X or the expression
 643    corresponding to REF, set the memory attributes.  OBJECTP is nonzero
 644    if we are making a new object of this type.  */
 645 extern void set_mem_attributes PARAMS ((rtx, tree, int));
 646 #endif
 647
 648 /* Assemble the static constant template for function entry trampolines.  */
 649 extern rtx assemble_trampoline_template PARAMS ((void));
 650
 651 /* Given rtx, return new rtx whose address won't be affected by
 652    any side effects.  It has been copied to a new temporary reg.  */
 653 extern rtx stabilize PARAMS ((rtx));
 654
 655 /* Given an rtx, copy all regs it refers to into new temps
 656    and return a modified copy that refers to the new temps.  */
 657 extern rtx copy_all_regs PARAMS ((rtx));
 658
 659 /* Copy given rtx to a new temp reg and return that.  */
 660 extern rtx copy_to_reg PARAMS ((rtx));
 661
 662 /* Like copy_to_reg but always make the reg Pmode.  */
 663 extern rtx copy_addr_to_reg PARAMS ((rtx));
 664
 665 /* Like copy_to_reg but always make the reg the specified mode MODE.  */
 666 extern rtx copy_to_mode_reg PARAMS ((enum machine_mode, rtx));
 667
 668 /* Copy given rtx to given temp reg and return that.  */
 669 extern rtx copy_to_suggested_reg PARAMS ((rtx, rtx, enum machine_mode));
 670
 671 /* Copy a value to a register if it isn't already a register.
 672    Args are mode (in case value is a constant) and the value.  */
 673 extern rtx force_reg PARAMS ((enum machine_mode, rtx));
 674
 675 /* Return given rtx, copied into a new temp reg if it was in memory.  */
 676 extern rtx force_not_mem PARAMS ((rtx));
 677
 678 #ifdef TREE_CODE
 679 /* Return mode and signedness to use when object is promoted.  */
 680 extern enum machine_mode promote_mode PARAMS ((tree, enum machine_mode,
 681                                                int *, int));
 682 #endif
 683
 684 /* Remove some bytes from the stack.  An rtx says how many.  */
 685 extern void adjust_stack PARAMS ((rtx));
 686
 687 /* Add some bytes to the stack.  An rtx says how many.  */
 688 extern void anti_adjust_stack PARAMS ((rtx));
 689
 690 /* This enum is used for the following two functions.  */
 691 enum save_level {SAVE_BLOCK, SAVE_FUNCTION, SAVE_NONLOCAL};
 692
 693 /* Save the stack pointer at the specified level.  */
 694 extern void emit_stack_save PARAMS ((enum save_level, rtx *, rtx));
 695
 696 /* Restore the stack pointer from a save area of the specified level.  */
 697 extern void emit_stack_restore PARAMS ((enum save_level, rtx, rtx));
 698
 699 /* Allocate some space on the stack dynamically and return its address.  An rtx
 700    says how many bytes.  */
 701 extern rtx allocate_dynamic_stack_space PARAMS ((rtx, rtx, int));
 702
 703 /* Probe a range of stack addresses from FIRST to FIRST+SIZE, inclusive.
 704    FIRST is a constant and size is a Pmode RTX.  These are offsets from the
 705    current stack pointer.  STACK_GROWS_DOWNWARD says whether to add or
 706    subtract from the stack.  If SIZE is constant, this is done
 707    with a fixed number of probes.  Otherwise, we must make a loop.  */
 708 extern void probe_stack_range PARAMS ((HOST_WIDE_INT, rtx));
 709
 710 /* Return an rtx that refers to the value returned by a library call
 711    in its original home.  This becomes invalid if any more code is emitted.  */
 712 extern rtx hard_libcall_value PARAMS ((enum machine_mode));
 713
 714 /* Given an rtx, return an rtx for a value rounded up to a multiple
 715    of STACK_BOUNDARY / BITS_PER_UNIT.  */
 716 extern rtx round_push PARAMS ((rtx));
 717
 718 /* Return the mode desired by operand N of a particular bitfield
 719    insert/extract insn, or MAX_MACHINE_MODE if no such insn is
 720    available.  */
 721
 722 enum extraction_pattern { EP_insv, EP_extv, EP_extzv };
 723 extern enum machine_mode
 724 mode_for_extraction PARAMS ((enum extraction_pattern, int));
 725
 726 extern rtx store_bit_field PARAMS ((rtx, unsigned HOST_WIDE_INT,
 727                                     unsigned HOST_WIDE_INT,
 728                                     enum machine_mode, rtx,
 729                                     unsigned int, HOST_WIDE_INT));
 730 extern rtx extract_bit_field PARAMS ((rtx, unsigned HOST_WIDE_INT,
 731                                       unsigned HOST_WIDE_INT, int, rtx,
 732                                       enum machine_mode, enum machine_mode,
 733                                       unsigned int, HOST_WIDE_INT));
 734 extern rtx expand_mult PARAMS ((enum machine_mode, rtx, rtx, rtx, int));
 735 extern rtx expand_mult_add PARAMS ((rtx, rtx, rtx, rtx,enum machine_mode, int));
 736 extern rtx expand_mult_highpart_adjust PARAMS ((enum machine_mode, rtx, rtx, rtx, rtx, int));
 737
 738 extern rtx assemble_static_space PARAMS ((int));
 739
 740 /* Hook called by expand_expr for language-specific tree codes.
 741    It is up to the language front end to install a hook
 742    if it has any such codes that expand_expr needs to know about.  */
 743 extern rtx (*lang_expand_expr) PARAMS ((union tree_node *, rtx,
 744                                         enum machine_mode,
 745                                         enum expand_modifier modifier));
 746
 747 #ifdef TREE_CODE
 748 /* Hook called by output_constant for language-specific tree codes.
 749    It is up to the language front-end to install a hook if it has any
 750    such codes that output_constant needs to know about.  Returns a
 751    language-independent constant equivalent to its input.  */
 752 extern tree (*lang_expand_constant) PARAMS ((tree));
 753
 754 extern int safe_from_p PARAMS ((rtx, tree, int));
 755
 756 /* Hook called by safe_from_p for language-specific tree codes.  It is
 757    up to the language front-end to install a hook if it has any such
 758    codes that safe_from_p needs to know about.  Since same_from_p will
 759    recursively explore the TREE_OPERANDs of an expression, this hook
 760    should not reexamine those pieces.  This routine may recursively
 761    call safe_from_p; it should always pass `0' as the TOP_P
 762    parameter.  */
 763 extern int (*lang_safe_from_p) PARAMS ((rtx, tree));
 764 #endif
 765
 766 /* Call this once to initialize the contents of the optabs
 767    appropriately for the current target machine.  */
 768 extern void init_optabs                         PARAMS ((void));
 769 extern void init_all_optabs                     PARAMS ((void));
 770
 771 /* Call this to initialize an optab function entry.  */
 772 extern rtx init_one_libfunc                     PARAMS ((const char *));
 773
 774 extern void do_jump_by_parts_equality_rtx       PARAMS ((rtx, rtx, rtx));
 775 extern void do_jump_by_parts_greater_rtx        PARAMS ((enum machine_mode,
 776                                                          int, rtx, rtx, rtx,
 777                                                          rtx));
 778
 779 #ifdef TREE_CODE   /* Don't lose if tree.h not included.  */
 780 extern void mark_seen_cases                     PARAMS ((tree, unsigned char *,
 781                                                          HOST_WIDE_INT, int));
 782 #endif