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