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, 2001, 2002, 2003 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_STACK_PARM means we are possibly expanding a call param onto
  48    the stack.  Choosing a value of 2 isn't special;  It just allows
  49    some code optimization in store_expr.
  50    EXPAND_SUM means it is ok to return a PLUS rtx or MULT rtx.
  51    EXPAND_INITIALIZER is similar but also record any labels on forced_labels.
  52    EXPAND_CONST_ADDRESS means it is ok to return a MEM whose address
  53     is a constant that is not a legitimate address.
  54    EXPAND_WRITE means we are only going to write to the resulting rtx.  */
  55 enum expand_modifier {EXPAND_NORMAL = 0, EXPAND_STACK_PARM = 2, EXPAND_SUM,
  56                       EXPAND_CONST_ADDRESS, EXPAND_INITIALIZER, EXPAND_WRITE};
  57
  58 /* Prevent the compiler from deferring stack pops.  See
  59    inhibit_defer_pop for more information.  */
  60 #define NO_DEFER_POP (inhibit_defer_pop += 1)
  61
  62 /* Allow the compiler to defer stack pops.  See inhibit_defer_pop for
  63    more information.  */
  64 #define OK_DEFER_POP (inhibit_defer_pop -= 1)
  65 \f
  66 #ifdef TREE_CODE /* Don't lose if tree.h not included.  */
  67 /* Structure to record the size of a sequence of arguments
  68    as the sum of a tree-expression and a constant.  This structure is
  69    also used to store offsets from the stack, which might be negative,
  70    so the variable part must be ssizetype, not sizetype.  */
  71
  72 struct args_size
  73 {
  74   HOST_WIDE_INT constant;
  75   tree var;
  76 };
  77 #endif
  78
  79 /* Add the value of the tree INC to the `struct args_size' TO.  */
  80
  81 #define ADD_PARM_SIZE(TO, INC)                          \
  82 do {                                                    \
  83   tree inc = (INC);                                     \
  84   if (host_integerp (inc, 0))                           \
  85     (TO).constant += tree_low_cst (inc, 0);             \
  86   else if ((TO).var == 0)                               \
  87     (TO).var = convert (ssizetype, inc);                \
  88   else                                                  \
  89     (TO).var = size_binop (PLUS_EXPR, (TO).var,         \
  90                            convert (ssizetype, inc));   \
  91 } while (0)
  92
  93 #define SUB_PARM_SIZE(TO, DEC)                          \
  94 do {                                                    \
  95   tree dec = (DEC);                                     \
  96   if (host_integerp (dec, 0))                           \
  97     (TO).constant -= tree_low_cst (dec, 0);             \
  98   else if ((TO).var == 0)                               \
  99     (TO).var = size_binop (MINUS_EXPR, ssize_int (0),   \
 100                            convert (ssizetype, dec));   \
 101   else                                                  \
 102     (TO).var = size_binop (MINUS_EXPR, (TO).var,        \
 103                            convert (ssizetype, dec));   \
 104 } while (0)
 105
 106 /* Convert the implicit sum in a `struct args_size' into a tree
 107    of type ssizetype.  */
 108 #define ARGS_SIZE_TREE(SIZE)                                    \
 109 ((SIZE).var == 0 ? ssize_int ((SIZE).constant)                  \
 110  : size_binop (PLUS_EXPR, convert (ssizetype, (SIZE).var),      \
 111                ssize_int ((SIZE).constant)))
 112
 113 /* Convert the implicit sum in a `struct args_size' into an rtx.  */
 114 #define ARGS_SIZE_RTX(SIZE)                                     \
 115 ((SIZE).var == 0 ? GEN_INT ((SIZE).constant)                    \
 116  : expand_expr (ARGS_SIZE_TREE (SIZE), NULL_RTX, VOIDmode, 0))
 117
 118 /* Supply a default definition for FUNCTION_ARG_PADDING:
 119    usually pad upward, but pad short args downward on
 120    big-endian machines.  */
 121
 122 enum direction {none, upward, downward};  /* Value has this type.  */
 123
 124 #ifndef FUNCTION_ARG_PADDING
 125 #define FUNCTION_ARG_PADDING(MODE, TYPE)                                \
 126   (! BYTES_BIG_ENDIAN                                                   \
 127    ? upward                                                             \
 128    : (((MODE) == BLKmode                                                \
 129        ? ((TYPE) && TREE_CODE (TYPE_SIZE (TYPE)) == INTEGER_CST         \
 130           && int_size_in_bytes (TYPE) < (PARM_BOUNDARY / BITS_PER_UNIT)) \
 131        : GET_MODE_BITSIZE (MODE) < PARM_BOUNDARY)                       \
 132       ? downward : upward))
 133 #endif
 134
 135 /* Supply a default definition for FUNCTION_ARG_BOUNDARY.  Normally, we let
 136    FUNCTION_ARG_PADDING, which also pads the length, handle any needed
 137    alignment.  */
 138
 139 #ifndef FUNCTION_ARG_BOUNDARY
 140 #define FUNCTION_ARG_BOUNDARY(MODE, TYPE)       PARM_BOUNDARY
 141 #endif
 142
 143 /* Provide a default value for STRICT_ARGUMENT_NAMING.  */
 144 #ifndef STRICT_ARGUMENT_NAMING
 145 #define STRICT_ARGUMENT_NAMING 0
 146 #endif
 147
 148 /* Provide a default value for PRETEND_OUTGOING_VARARGS_NAMED.  */
 149 #ifdef SETUP_INCOMING_VARARGS
 150 #ifndef PRETEND_OUTGOING_VARARGS_NAMED
 151 #define PRETEND_OUTGOING_VARARGS_NAMED 1
 152 #endif
 153 #else
 154 /* It is an error to define PRETEND_OUTGOING_VARARGS_NAMED without
 155    defining SETUP_INCOMING_VARARGS.  */
 156 #define PRETEND_OUTGOING_VARARGS_NAMED 0
 157 #endif
 158
 159 /* Nonzero if we do not know how to pass TYPE solely in registers.  */
 160 extern bool default_must_pass_in_stack PARAMS((enum machine_mode, tree));
 161 #ifndef MUST_PASS_IN_STACK
 162 #define MUST_PASS_IN_STACK(MODE,TYPE) default_must_pass_in_stack(MODE, TYPE)
 163 #endif
 164
 165 /* Nonzero if type TYPE should be returned in memory.
 166    Most machines can use the following default definition.  */
 167
 168 #ifndef RETURN_IN_MEMORY
 169 #define RETURN_IN_MEMORY(TYPE) (TYPE_MODE (TYPE) == BLKmode)
 170 #endif
 171
 172 /* Supply a default definition of STACK_SAVEAREA_MODE for emit_stack_save.
 173    Normally move_insn, so Pmode stack pointer.  */
 174
 175 #ifndef STACK_SAVEAREA_MODE
 176 #define STACK_SAVEAREA_MODE(LEVEL) Pmode
 177 #endif
 178
 179 /* Supply a default definition of STACK_SIZE_MODE for
 180    allocate_dynamic_stack_space.  Normally PLUS/MINUS, so word_mode.  */
 181
 182 #ifndef STACK_SIZE_MODE
 183 #define STACK_SIZE_MODE word_mode
 184 #endif
 185
 186 /* Provide default values for the macros controlling stack checking.  */
 187
 188 #ifndef STACK_CHECK_BUILTIN
 189 #define STACK_CHECK_BUILTIN 0
 190 #endif
 191
 192 /* The default interval is one page.  */
 193 #ifndef STACK_CHECK_PROBE_INTERVAL
 194 #define STACK_CHECK_PROBE_INTERVAL 4096
 195 #endif
 196
 197 /* The default is to do a store into the stack.  */
 198 #ifndef STACK_CHECK_PROBE_LOAD
 199 #define STACK_CHECK_PROBE_LOAD 0
 200 #endif
 201
 202 /* This value is arbitrary, but should be sufficient for most machines.  */
 203 #ifndef STACK_CHECK_PROTECT
 204 #define STACK_CHECK_PROTECT (75 * UNITS_PER_WORD)
 205 #endif
 206
 207 /* Make the maximum frame size be the largest we can and still only need
 208    one probe per function.  */
 209 #ifndef STACK_CHECK_MAX_FRAME_SIZE
 210 #define STACK_CHECK_MAX_FRAME_SIZE \
 211   (STACK_CHECK_PROBE_INTERVAL - UNITS_PER_WORD)
 212 #endif
 213
 214 /* This is arbitrary, but should be large enough everywhere.  */
 215 #ifndef STACK_CHECK_FIXED_FRAME_SIZE
 216 #define STACK_CHECK_FIXED_FRAME_SIZE (4 * UNITS_PER_WORD)
 217 #endif
 218
 219 /* Provide a reasonable default for the maximum size of an object to
 220    allocate in the fixed frame.  We may need to be able to make this
 221    controllable by the user at some point.  */
 222 #ifndef STACK_CHECK_MAX_VAR_SIZE
 223 #define STACK_CHECK_MAX_VAR_SIZE (STACK_CHECK_MAX_FRAME_SIZE / 100)
 224 #endif
 225 \f
 226 /* Functions from optabs.c, commonly used, and without need for the optabs
 227    tables:  */
 228
 229 /* Passed to expand_simple_binop and expand_binop to say which options
 230    to try to use if the requested operation can't be open-coded on the
 231    requisite mode.  Either OPTAB_LIB or OPTAB_LIB_WIDEN says try using
 232    a library call.  Either OPTAB_WIDEN or OPTAB_LIB_WIDEN says try
 233    using a wider mode.  OPTAB_MUST_WIDEN says try widening and don't
 234    try anything else.  */
 235
 236 enum optab_methods
 237 {
 238   OPTAB_DIRECT,
 239   OPTAB_LIB,
 240   OPTAB_WIDEN,
 241   OPTAB_LIB_WIDEN,
 242   OPTAB_MUST_WIDEN
 243 };
 244
 245 /* Generate code for a simple binary or unary operation.  "Simple" in
 246    this case means "can be unambiguously described by a (mode, code)
 247    pair and mapped to a single optab."  */
 248 extern rtx expand_simple_binop PARAMS ((enum machine_mode, enum rtx_code, rtx,
 249                                         rtx, rtx, int, enum optab_methods));
 250 extern rtx expand_simple_unop PARAMS ((enum machine_mode, enum rtx_code,
 251                                        rtx, rtx, int));
 252
 253 /* Report whether the machine description contains an insn which can
 254    perform the operation described by CODE and MODE.  */
 255 extern int have_insn_for PARAMS ((enum rtx_code, enum machine_mode));
 256
 257 /* Emit code to make a call to a constant function or a library call.  */
 258 extern void emit_libcall_block PARAMS ((rtx, rtx, rtx, rtx));
 259
 260 /* Create but don't emit one rtl instruction to perform certain operations.
 261    Modes must match; operands must meet the operation's predicates.
 262    Likewise for subtraction and for just copying.
 263    These do not call protect_from_queue; caller must do so.  */
 264 extern rtx gen_add2_insn PARAMS ((rtx, rtx));
 265 extern rtx gen_add3_insn PARAMS ((rtx, rtx, rtx));
 266 extern rtx gen_sub2_insn PARAMS ((rtx, rtx));
 267 extern rtx gen_sub3_insn PARAMS ((rtx, rtx, rtx));
 268 extern rtx gen_move_insn PARAMS ((rtx, rtx));
 269 extern int have_add2_insn PARAMS ((rtx, rtx));
 270 extern int have_sub2_insn PARAMS ((rtx, rtx));
 271
 272 /* Emit a pair of rtl insns to compare two rtx's and to jump
 273    to a label if the comparison is true.  */
 274 extern void emit_cmp_and_jump_insns PARAMS ((rtx, rtx, enum rtx_code, rtx,
 275                                              enum machine_mode, int, rtx));
 276
 277 /* Generate code to indirectly jump to a location given in the rtx LOC.  */
 278 extern void emit_indirect_jump PARAMS ((rtx));
 279
 280 #ifdef HAVE_conditional_move
 281 /* Emit a conditional move operation.  */
 282 rtx emit_conditional_move PARAMS ((rtx, enum rtx_code, rtx, rtx,
 283                                    enum machine_mode, rtx, rtx,
 284                                    enum machine_mode, int));
 285
 286 /* Return nonzero if the conditional move is supported.  */
 287 int can_conditionally_move_p PARAMS ((enum machine_mode mode));
 288
 289 #endif
 290 rtx emit_conditional_add PARAMS ((rtx, enum rtx_code, rtx, rtx,
 291                                   enum machine_mode, rtx, rtx,
 292                                   enum machine_mode, int));
 293
 294 \f
 295 /* Functions from expmed.c:  */
 296
 297 /* Arguments MODE, RTX: return an rtx for the negation of that value.
 298    May emit insns.  */
 299 extern rtx negate_rtx PARAMS ((enum machine_mode, rtx));
 300
 301 /* Expand a logical AND operation.  */
 302 extern rtx expand_and PARAMS ((enum machine_mode, rtx, rtx, rtx));
 303
 304 /* Emit a store-flag operation.  */
 305 extern rtx emit_store_flag PARAMS ((rtx, enum rtx_code, rtx, rtx,
 306                                     enum machine_mode, int, int));
 307
 308 /* Like emit_store_flag, but always succeeds.  */
 309 extern rtx emit_store_flag_force PARAMS ((rtx, enum rtx_code, rtx, rtx,
 310                                           enum machine_mode, int, int));
 311
 312 /* Functions from loop.c:  */
 313
 314 /* Given an insn and condition, return a canonical description of
 315    the test being made.  */
 316 extern rtx canonicalize_condition PARAMS ((rtx, rtx, int, rtx *, rtx));
 317
 318 /* Given a JUMP_INSN, return a canonical description of the test
 319    being made.  */
 320 extern rtx get_condition PARAMS ((rtx, rtx *));
 321
 322 /* Generate a conditional trap instruction.  */
 323 extern rtx gen_cond_trap PARAMS ((enum rtx_code, rtx, rtx, rtx));
 324 \f
 325 /* Functions from builtins.c:  */
 326 extern rtx expand_builtin PARAMS ((tree, rtx, rtx, enum machine_mode, int));
 327 extern void std_expand_builtin_va_start PARAMS ((tree, rtx));
 328 extern rtx std_expand_builtin_va_arg PARAMS ((tree, tree));
 329 extern rtx expand_builtin_va_arg PARAMS ((tree, tree));
 330 extern void default_init_builtins PARAMS ((void));
 331 extern rtx default_expand_builtin PARAMS ((tree, rtx, rtx,
 332                                            enum machine_mode, int));
 333 extern void expand_builtin_setjmp_setup PARAMS ((rtx, rtx));
 334 extern void expand_builtin_setjmp_receiver PARAMS ((rtx));
 335 extern void expand_builtin_longjmp PARAMS ((rtx, rtx));
 336 extern rtx expand_builtin_saveregs PARAMS ((void));
 337 extern void expand_builtin_trap PARAMS ((void));
 338 extern HOST_WIDE_INT get_varargs_alias_set PARAMS ((void));
 339 extern HOST_WIDE_INT get_frame_alias_set PARAMS ((void));
 340 extern void record_base_value           PARAMS ((unsigned int, rtx, int));
 341 extern void record_alias_subset         PARAMS ((HOST_WIDE_INT,
 342                                                  HOST_WIDE_INT));
 343 extern HOST_WIDE_INT new_alias_set              PARAMS ((void));
 344 extern int can_address_p                PARAMS ((tree));
 345 \f
 346 /* Functions from expr.c:  */
 347
 348 /* This is run once per compilation to set up which modes can be used
 349    directly in memory and to initialize the block move optab.  */
 350 extern void init_expr_once PARAMS ((void));
 351
 352 /* This is run at the start of compiling a function.  */
 353 extern void init_expr PARAMS ((void));
 354
 355 /* This is run at the end of compiling a function.  */
 356 extern void finish_expr_for_function PARAMS ((void));
 357
 358 /* Use protect_from_queue to convert a QUEUED expression
 359    into something that you can put immediately into an instruction.  */
 360 extern rtx protect_from_queue PARAMS ((rtx, int));
 361
 362 /* Perform all the pending incrementations.  */
 363 extern void emit_queue PARAMS ((void));
 364
 365 /* Tell if something has a queued subexpression.  */
 366 extern int queued_subexp_p PARAMS ((rtx));
 367
 368 /* Emit some rtl insns to move data between rtx's, converting machine modes.
 369    Both modes must be floating or both fixed.  */
 370 extern void convert_move PARAMS ((rtx, rtx, int));
 371
 372 /* Convert an rtx to specified machine mode and return the result.  */
 373 extern rtx convert_to_mode PARAMS ((enum machine_mode, rtx, int));
 374
 375 /* Convert an rtx to MODE from OLDMODE and return the result.  */
 376 extern rtx convert_modes PARAMS ((enum machine_mode, enum machine_mode,
 377                                   rtx, int));
 378
 379 /* Emit code to move a block Y to a block X.  */
 380
 381 enum block_op_methods
 382 {
 383   BLOCK_OP_NORMAL,
 384   BLOCK_OP_NO_LIBCALL,
 385   BLOCK_OP_CALL_PARM
 386 };
 387
 388 extern rtx emit_block_move PARAMS ((rtx, rtx, rtx, enum block_op_methods));
 389
 390 /* Copy all or part of a value X into registers starting at REGNO.
 391    The number of registers to be filled is NREGS.  */
 392 extern void move_block_to_reg PARAMS ((int, rtx, int, enum machine_mode));
 393
 394 /* Copy all or part of a BLKmode value X out of registers starting at REGNO.
 395    The number of registers to be filled is NREGS.  */
 396 extern void move_block_from_reg PARAMS ((int, rtx, int, int));
 397
 398 /* Generate a non-consecutive group of registers represented by a PARALLEL.  */
 399 extern rtx gen_group_rtx PARAMS ((rtx));
 400
 401 /* Load a BLKmode value into non-consecutive registers represented by a
 402    PARALLEL.  */
 403 extern void emit_group_load PARAMS ((rtx, rtx, int));
 404
 405 /* Move a non-consecutive group of registers represented by a PARALLEL into
 406    a non-consecutive group of registers represented by a PARALLEL.  */
 407 extern void emit_group_move PARAMS ((rtx, rtx));
 408
 409 /* Store a BLKmode value from non-consecutive registers represented by a
 410    PARALLEL.  */
 411 extern void emit_group_store PARAMS ((rtx, rtx, int));
 412
 413 #ifdef TREE_CODE
 414 /* Copy BLKmode object from a set of registers.  */
 415 extern rtx copy_blkmode_from_reg PARAMS ((rtx,rtx,tree));
 416 #endif
 417
 418 /* Mark REG as holding a parameter for the next CALL_INSN.  */
 419 extern void use_reg PARAMS ((rtx *, rtx));
 420
 421 /* Mark NREGS consecutive regs, starting at REGNO, as holding parameters
 422    for the next CALL_INSN.  */
 423 extern void use_regs PARAMS ((rtx *, int, int));
 424
 425 /* Mark a PARALLEL as holding a parameter for the next CALL_INSN.  */
 426 extern void use_group_regs PARAMS ((rtx *, rtx));
 427
 428 /* Write zeros through the storage of OBJECT.
 429    If OBJECT has BLKmode, SIZE is its length in bytes.  */
 430 extern rtx clear_storage PARAMS ((rtx, rtx));
 431
 432 /* Return nonzero if it is desirable to store LEN bytes generated by
 433    CONSTFUN with several move instructions by store_by_pieces
 434    function.  CONSTFUNDATA is a pointer which will be passed as argument
 435    in every CONSTFUN call.
 436    ALIGN is maximum alignment we can assume.  */
 437 extern int can_store_by_pieces PARAMS ((unsigned HOST_WIDE_INT,
 438                                         rtx (*) (PTR, HOST_WIDE_INT,
 439                                                  enum machine_mode),
 440                                         PTR, unsigned int));
 441
 442 /* Generate several move instructions to store LEN bytes generated by
 443    CONSTFUN to block TO.  (A MEM rtx with BLKmode).  CONSTFUNDATA is a
 444    pointer which will be passed as argument in every CONSTFUN call.
 445    ALIGN is maximum alignment we can assume.  */
 446 extern void store_by_pieces PARAMS ((rtx, unsigned HOST_WIDE_INT,
 447                                      rtx (*) (PTR, HOST_WIDE_INT,
 448                                               enum machine_mode),
 449                                      PTR, unsigned int));
 450
 451 /* Emit insns to set X from Y.  */
 452 extern rtx emit_move_insn PARAMS ((rtx, rtx));
 453
 454 /* Emit insns to set X from Y, with no frills.  */
 455 extern rtx emit_move_insn_1 PARAMS ((rtx, rtx));
 456
 457 /* Push a block of length SIZE (perhaps variable)
 458    and return an rtx to address the beginning of the block.  */
 459 extern rtx push_block PARAMS ((rtx, int, int));
 460
 461 #ifdef TREE_CODE
 462 /* Generate code to push something onto the stack, given its mode and type.  */
 463 extern void emit_push_insn PARAMS ((rtx, enum machine_mode, tree, rtx,
 464                                     unsigned int, int, rtx, int, rtx, rtx,
 465                                     int, rtx));
 466
 467 /* Expand an assignment that stores the value of FROM into TO.  */
 468 extern rtx expand_assignment PARAMS ((tree, tree, int, int));
 469
 470 /* Generate code for computing expression EXP,
 471    and storing the value into TARGET.
 472    If SUGGEST_REG is nonzero, copy the value through a register
 473    and return that register, if that is possible.  */
 474 extern rtx store_expr PARAMS ((tree, rtx, int));
 475 #endif
 476
 477 /* Given an rtx that may include add and multiply operations,
 478    generate them as insns and return a pseudo-reg containing the value.
 479    Useful after calling expand_expr with 1 as sum_ok.  */
 480 extern rtx force_operand PARAMS ((rtx, rtx));
 481
 482 /* Return an object on the placeholder list that matches EXP, a
 483    PLACEHOLDER_EXPR.  An object "matches" if it is of the type of the
 484    PLACEHOLDER_EXPR or a pointer type to it.  For further information, see
 485    tree.def.  If no such object is found, abort.  If PLIST is nonzero, it is
 486    a location which initially points to a starting location in the
 487    placeholder list (zero means start of the list) and where a pointer into
 488    the placeholder list at which the object is found is placed.  */
 489 extern tree find_placeholder PARAMS ((tree, tree *));
 490
 491 /* Generate code for computing expression EXP.
 492    An rtx for the computed value is returned.  The value is never null.
 493    In the case of a void EXP, const0_rtx is returned.  */
 494 extern rtx expand_expr PARAMS ((tree, rtx, enum machine_mode,
 495                                 enum expand_modifier));
 496
 497 /* At the start of a function, record that we have no previously-pushed
 498    arguments waiting to be popped.  */
 499 extern void init_pending_stack_adjust PARAMS ((void));
 500
 501 /* When exiting from function, if safe, clear out any pending stack adjust
 502    so the adjustment won't get done.  */
 503 extern void clear_pending_stack_adjust PARAMS ((void));
 504
 505 /* Pop any previously-pushed arguments that have not been popped yet.  */
 506 extern void do_pending_stack_adjust PARAMS ((void));
 507
 508 #ifdef TREE_CODE
 509 /* Return the tree node and offset if a given argument corresponds to
 510    a string constant.  */
 511 extern tree string_constant PARAMS ((tree, tree *));
 512
 513 /* Generate code to evaluate EXP and jump to LABEL if the value is zero.  */
 514 extern void jumpifnot PARAMS ((tree, rtx));
 515
 516 /* Generate code to evaluate EXP and jump to LABEL if the value is nonzero.  */
 517 extern void jumpif PARAMS ((tree, rtx));
 518
 519 /* Generate code to evaluate EXP and jump to IF_FALSE_LABEL if
 520    the result is zero, or IF_TRUE_LABEL if the result is one.  */
 521 extern void do_jump PARAMS ((tree, rtx, rtx));
 522 #endif
 523
 524 /* Generate rtl to compare two rtx's, will call emit_cmp_insn.  */
 525 extern rtx compare_from_rtx PARAMS ((rtx, rtx, enum rtx_code, int,
 526                                      enum machine_mode, rtx));
 527 extern void do_compare_rtx_and_jump PARAMS ((rtx, rtx, enum rtx_code, int,
 528                                              enum machine_mode, rtx,
 529                                              rtx, rtx));
 530
 531 /* Two different ways of generating switch statements.  */
 532 extern int try_casesi    PARAMS ((tree, tree, tree, tree, rtx, rtx));
 533 extern int try_tablejump PARAMS ((tree, tree, tree, tree, rtx, rtx));
 534
 535 /* Smallest number of adjacent cases before we use a jump table.
 536    XXX Should be a target hook.  */
 537 extern unsigned int case_values_threshold PARAMS ((void));
 538
 539 \f
 540 #ifdef TREE_CODE
 541 /* rtl.h and tree.h were included.  */
 542 /* Return an rtx for the size in bytes of the value of an expr.  */
 543 extern rtx expr_size PARAMS ((tree));
 544
 545 /* Return a wide integer for the size in bytes of the value of EXP, or -1
 546    if the size can vary or is larger than an integer.  */
 547 extern HOST_WIDE_INT int_expr_size PARAMS ((tree));
 548
 549 extern rtx lookup_static_chain PARAMS ((tree));
 550
 551 /* Convert a stack slot address ADDR valid in function FNDECL
 552    into an address valid in this function (using a static chain).  */
 553 extern rtx fix_lexical_addr PARAMS ((rtx, tree));
 554
 555 /* Return the address of the trampoline for entering nested fn FUNCTION.  */
 556 extern rtx trampoline_address PARAMS ((tree));
 557
 558 /* Return an rtx that refers to the value returned by a function
 559    in its original home.  This becomes invalid if any more code is emitted.  */
 560 extern rtx hard_function_value PARAMS ((tree, tree, int));
 561
 562 extern rtx prepare_call_address PARAMS ((rtx, tree, rtx *, int, int));
 563
 564 extern rtx expand_call PARAMS ((tree, rtx, int));
 565
 566 extern rtx expand_shift PARAMS ((enum tree_code, enum machine_mode, rtx, tree,
 567                                  rtx, int));
 568 extern rtx expand_divmod PARAMS ((int, enum tree_code, enum machine_mode, rtx,
 569                                   rtx, rtx, int));
 570 extern void locate_and_pad_parm PARAMS ((enum machine_mode, tree, int, tree,
 571                                          struct args_size *,
 572                                          struct args_size *,
 573                                          struct args_size *,
 574                                          struct args_size *));
 575 extern rtx expand_inline_function PARAMS ((tree, tree, rtx, int, tree, rtx));
 576
 577 /* Return the CODE_LABEL rtx for a LABEL_DECL, creating it if necessary.  */
 578 extern rtx label_rtx PARAMS ((tree));
 579 #endif
 580
 581 /* Indicate how an input argument register was promoted.  */
 582 extern rtx promoted_input_arg PARAMS ((unsigned int, enum machine_mode *,
 583                                        int *));
 584
 585 /* Return an rtx like arg but sans any constant terms.
 586    Returns the original rtx if it has no constant terms.
 587    The constant terms are added and stored via a second arg.  */
 588 extern rtx eliminate_constant_term PARAMS ((rtx, rtx *));
 589
 590 /* Convert arg to a valid memory address for specified machine mode,
 591    by emitting insns to perform arithmetic if nec.  */
 592 extern rtx memory_address PARAMS ((enum machine_mode, rtx));
 593
 594 /* Like `memory_address' but pretent `flag_force_addr' is 0.  */
 595 extern rtx memory_address_noforce PARAMS ((enum machine_mode, rtx));
 596
 597 /* Set the alias set of MEM to SET.  */
 598 extern void set_mem_alias_set PARAMS ((rtx, HOST_WIDE_INT));
 599
 600 /* Set the alignment of MEM to ALIGN bits.  */
 601 extern void set_mem_align PARAMS ((rtx, unsigned int));
 602
 603 /* Set the expr for MEM to EXPR.  */
 604 extern void set_mem_expr PARAMS ((rtx, tree));
 605
 606 /* Set the offset for MEM to OFFSET.  */
 607 extern void set_mem_offset PARAMS ((rtx, rtx));
 608
 609 /* Set the size for MEM to SIZE.  */
 610 extern void set_mem_size PARAMS ((rtx, rtx));
 611
 612 /* Return a memory reference like MEMREF, but with its mode changed
 613    to MODE and its address changed to ADDR.
 614    (VOIDmode means don't change the mode.
 615    NULL for ADDR means don't change the address.)  */
 616 extern rtx change_address PARAMS ((rtx, enum machine_mode, rtx));
 617
 618 /* Return a memory reference like MEMREF, but with its mode changed
 619    to MODE and its address offset by OFFSET bytes.  */
 620 #define adjust_address(MEMREF, MODE, OFFSET) \
 621   adjust_address_1 (MEMREF, MODE, OFFSET, 1, 1)
 622
 623 /* Likewise, but the reference is not required to be valid.  */
 624 #define adjust_address_nv(MEMREF, MODE, OFFSET) \
 625   adjust_address_1 (MEMREF, MODE, OFFSET, 0, 1)
 626
 627 /* Return a memory reference like MEMREF, but with its mode changed
 628    to MODE and its address changed to ADDR, which is assumed to be
 629    increased by OFFSET bytes from MEMREF.  */
 630 #define adjust_automodify_address(MEMREF, MODE, ADDR, OFFSET) \
 631   adjust_automodify_address_1 (MEMREF, MODE, ADDR, OFFSET, 1)
 632
 633 /* Likewise, but the reference is not required to be valid.  */
 634 #define adjust_automodify_address_nv(MEMREF, MODE, ADDR, OFFSET) \
 635   adjust_automodify_address_1 (MEMREF, MODE, ADDR, OFFSET, 0)
 636
 637 extern rtx adjust_address_1 PARAMS ((rtx, enum machine_mode, HOST_WIDE_INT,
 638                                      int, int));
 639 extern rtx adjust_automodify_address_1 PARAMS ((rtx, enum machine_mode,
 640                                                 rtx, HOST_WIDE_INT, int));
 641
 642 /* Return a memory reference like MEMREF, but whose address is changed by
 643    adding OFFSET, an RTX, to it.  POW2 is the highest power of two factor
 644    known to be in OFFSET (possibly 1).  */
 645 extern rtx offset_address PARAMS ((rtx, rtx, unsigned HOST_WIDE_INT));
 646
 647 /* Return a memory reference like MEMREF, but with its address changed to
 648    ADDR.  The caller is asserting that the actual piece of memory pointed
 649    to is the same, just the form of the address is being changed, such as
 650    by putting something into a register.  */
 651 extern rtx replace_equiv_address PARAMS ((rtx, rtx));
 652
 653 /* Likewise, but the reference is not required to be valid.  */
 654 extern rtx replace_equiv_address_nv PARAMS ((rtx, rtx));
 655
 656 /* Return a memory reference like MEMREF, but with its mode widened to
 657    MODE and adjusted by OFFSET.  */
 658 extern rtx widen_memory_access PARAMS ((rtx, enum machine_mode, HOST_WIDE_INT));
 659
 660 /* Return a memory reference like MEMREF, but which is known to have a
 661    valid address.  */
 662 extern rtx validize_mem PARAMS ((rtx));
 663
 664 #ifdef TREE_CODE
 665 /* Given REF, either a MEM or a REG, and T, either the type of X or
 666    the expression corresponding to REF, set RTX_UNCHANGING_P if
 667    appropriate.  */
 668 extern void maybe_set_unchanging PARAMS ((rtx, tree));
 669
 670 /* Given REF, a MEM, and T, either the type of X or the expression
 671    corresponding to REF, set the memory attributes.  OBJECTP is nonzero
 672    if we are making a new object of this type.  */
 673 extern void set_mem_attributes PARAMS ((rtx, tree, int));
 674
 675 /* Similar, except that BITPOS has not yet been applied to REF, so if
 676    we alter MEM_OFFSET according to T then we should subtract BITPOS
 677    expecting that it'll be added back in later.  */
 678 extern void set_mem_attributes_minus_bitpos PARAMS ((rtx, tree, int,
 679                                                      HOST_WIDE_INT));
 680 #endif
 681
 682 /* Assemble the static constant template for function entry trampolines.  */
 683 extern rtx assemble_trampoline_template PARAMS ((void));
 684
 685 /* Given rtx, return new rtx whose address won't be affected by
 686    any side effects.  It has been copied to a new temporary reg.  */
 687 extern rtx stabilize PARAMS ((rtx));
 688
 689 /* Given an rtx, copy all regs it refers to into new temps
 690    and return a modified copy that refers to the new temps.  */
 691 extern rtx copy_all_regs PARAMS ((rtx));
 692
 693 /* Copy given rtx to a new temp reg and return that.  */
 694 extern rtx copy_to_reg PARAMS ((rtx));
 695
 696 /* Like copy_to_reg but always make the reg Pmode.  */
 697 extern rtx copy_addr_to_reg PARAMS ((rtx));
 698
 699 /* Like copy_to_reg but always make the reg the specified mode MODE.  */
 700 extern rtx copy_to_mode_reg PARAMS ((enum machine_mode, rtx));
 701
 702 /* Copy given rtx to given temp reg and return that.  */
 703 extern rtx copy_to_suggested_reg PARAMS ((rtx, rtx, enum machine_mode));
 704
 705 /* Copy a value to a register if it isn't already a register.
 706    Args are mode (in case value is a constant) and the value.  */
 707 extern rtx force_reg PARAMS ((enum machine_mode, rtx));
 708
 709 /* Return given rtx, copied into a new temp reg if it was in memory.  */
 710 extern rtx force_not_mem PARAMS ((rtx));
 711
 712 #ifdef TREE_CODE
 713 /* Return mode and signedness to use when object is promoted.  */
 714 extern enum machine_mode promote_mode PARAMS ((tree, enum machine_mode,
 715                                                int *, int));
 716 #endif
 717
 718 /* Remove some bytes from the stack.  An rtx says how many.  */
 719 extern void adjust_stack PARAMS ((rtx));
 720
 721 /* Add some bytes to the stack.  An rtx says how many.  */
 722 extern void anti_adjust_stack PARAMS ((rtx));
 723
 724 /* This enum is used for the following two functions.  */
 725 enum save_level {SAVE_BLOCK, SAVE_FUNCTION, SAVE_NONLOCAL};
 726
 727 /* Save the stack pointer at the specified level.  */
 728 extern void emit_stack_save PARAMS ((enum save_level, rtx *, rtx));
 729
 730 /* Restore the stack pointer from a save area of the specified level.  */
 731 extern void emit_stack_restore PARAMS ((enum save_level, rtx, rtx));
 732
 733 /* Allocate some space on the stack dynamically and return its address.  An rtx
 734    says how many bytes.  */
 735 extern rtx allocate_dynamic_stack_space PARAMS ((rtx, rtx, int));
 736
 737 /* Probe a range of stack addresses from FIRST to FIRST+SIZE, inclusive.
 738    FIRST is a constant and size is a Pmode RTX.  These are offsets from the
 739    current stack pointer.  STACK_GROWS_DOWNWARD says whether to add or
 740    subtract from the stack.  If SIZE is constant, this is done
 741    with a fixed number of probes.  Otherwise, we must make a loop.  */
 742 extern void probe_stack_range PARAMS ((HOST_WIDE_INT, rtx));
 743
 744 /* Return an rtx that refers to the value returned by a library call
 745    in its original home.  This becomes invalid if any more code is emitted.  */
 746 extern rtx hard_libcall_value PARAMS ((enum machine_mode));
 747
 748 /* Given an rtx, return an rtx for a value rounded up to a multiple
 749    of STACK_BOUNDARY / BITS_PER_UNIT.  */
 750 extern rtx round_push PARAMS ((rtx));
 751
 752 /* Return the mode desired by operand N of a particular bitfield
 753    insert/extract insn, or MAX_MACHINE_MODE if no such insn is
 754    available.  */
 755
 756 enum extraction_pattern { EP_insv, EP_extv, EP_extzv };
 757 extern enum machine_mode
 758 mode_for_extraction PARAMS ((enum extraction_pattern, int));
 759
 760 extern rtx store_bit_field PARAMS ((rtx, unsigned HOST_WIDE_INT,
 761                                     unsigned HOST_WIDE_INT,
 762                                     enum machine_mode, rtx, HOST_WIDE_INT));
 763 extern rtx extract_bit_field PARAMS ((rtx, unsigned HOST_WIDE_INT,
 764                                       unsigned HOST_WIDE_INT, int, rtx,
 765                                       enum machine_mode, enum machine_mode,
 766                                       HOST_WIDE_INT));
 767 extern rtx expand_mult PARAMS ((enum machine_mode, rtx, rtx, rtx, int));
 768 extern bool const_mult_add_overflow_p PARAMS ((rtx, rtx, rtx, enum machine_mode, int));
 769 extern rtx expand_mult_add PARAMS ((rtx, rtx, rtx, rtx,enum machine_mode, int));
 770 extern rtx expand_mult_highpart_adjust PARAMS ((enum machine_mode, rtx, rtx, rtx, rtx, int));
 771
 772 extern rtx assemble_static_space PARAMS ((int));
 773 extern int safe_from_p PARAMS ((rtx, tree, int));
 774
 775 /* Call this once to initialize the contents of the optabs
 776    appropriately for the current target machine.  */
 777 extern void init_optabs                         PARAMS ((void));
 778 extern void init_all_optabs                     PARAMS ((void));
 779
 780 /* Call this to initialize an optab function entry.  */
 781 extern rtx init_one_libfunc                     PARAMS ((const char *));
 782
 783 extern void do_jump_by_parts_equality_rtx       PARAMS ((rtx, rtx, rtx));
 784 extern void do_jump_by_parts_greater_rtx        PARAMS ((enum machine_mode,
 785                                                          int, rtx, rtx, rtx,
 786                                                          rtx));
 787
 788 #ifdef TREE_CODE   /* Don't lose if tree.h not included.  */
 789 extern void mark_seen_cases                     PARAMS ((tree, unsigned char *,
 790                                                          HOST_WIDE_INT, int));
 791 #endif
 792
 793 extern int vector_mode_valid_p          PARAMS ((enum machine_mode));
 794
 795 extern tree placeholder_list;