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, 2004, 2005, 2006, 2007, 2008, 2009
   4    Free Software Foundation, Inc.
   5
   6 This file is part of GCC.
   7
   8 GCC is free software; you can redistribute it and/or modify it under
   9 the terms of the GNU General Public License as published by the Free
  10 Software Foundation; either version 3, or (at your option) any later
  11 version.
  12
  13 GCC is distributed in the hope that it will be useful, but WITHOUT ANY
  14 WARRANTY; without even the implied warranty of MERCHANTABILITY or
  15 FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
  16 for more details.
  17
  18 You should have received a copy of the GNU General Public License
  19 along with GCC; see the file COPYING3.  If not see
  20 <http://www.gnu.org/licenses/>.  */
  21
  22 #ifndef GCC_EXPR_H
  23 #define GCC_EXPR_H
  24
  25 /* For inhibit_defer_pop */
  26 #include "function.h"
  27 /* For XEXP, GEN_INT, rtx_code */
  28 #include "rtl.h"
  29 /* For optimize_size */
  30 #include "flags.h"
  31 /* For host_integerp, tree_low_cst, fold_convert, size_binop, ssize_int,
  32    TREE_CODE, TYPE_SIZE, int_size_in_bytes,    */
  33 #include "tree.h"
  34 /* For GET_MODE_BITSIZE, word_mode */
  35 #include "machmode.h"
  36
  37 /* The default branch cost is 1.  */
  38 #ifndef BRANCH_COST
  39 #define BRANCH_COST(speed_p, predictable_p) 1
  40 #endif
  41
  42 /* This is the 4th arg to `expand_expr'.
  43    EXPAND_STACK_PARM means we are possibly expanding a call param onto
  44    the stack.
  45    EXPAND_SUM means it is ok to return a PLUS rtx or MULT rtx.
  46    EXPAND_INITIALIZER is similar but also record any labels on forced_labels.
  47    EXPAND_CONST_ADDRESS means it is ok to return a MEM whose address
  48     is a constant that is not a legitimate address.
  49    EXPAND_WRITE means we are only going to write to the resulting rtx.
  50    EXPAND_MEMORY means we are interested in a memory result, even if
  51     the memory is constant and we could have propagated a constant value.  */
  52 enum expand_modifier {EXPAND_NORMAL = 0, EXPAND_STACK_PARM, EXPAND_SUM,
  53                       EXPAND_CONST_ADDRESS, EXPAND_INITIALIZER, EXPAND_WRITE,
  54                       EXPAND_MEMORY};
  55
  56 /* Prevent the compiler from deferring stack pops.  See
  57    inhibit_defer_pop for more information.  */
  58 #define NO_DEFER_POP (inhibit_defer_pop += 1)
  59
  60 /* Allow the compiler to defer stack pops.  See inhibit_defer_pop for
  61    more information.  */
  62 #define OK_DEFER_POP (inhibit_defer_pop -= 1)
  63 \f
  64 /* If a memory-to-memory move would take MOVE_RATIO or more simple
  65    move-instruction sequences, we will do a movmem or libcall instead.  */
  66
  67 #ifndef MOVE_RATIO
  68 #if defined (HAVE_movmemqi) || defined (HAVE_movmemhi) || defined (HAVE_movmemsi) || defined (HAVE_movmemdi) || defined (HAVE_movmemti)
  69 #define MOVE_RATIO(speed) 2
  70 #else
  71 /* If we are optimizing for space (-Os), cut down the default move ratio.  */
  72 #define MOVE_RATIO(speed) ((speed) ? 15 : 3)
  73 #endif
  74 #endif
  75
  76 /* If a clear memory operation would take CLEAR_RATIO or more simple
  77    move-instruction sequences, we will do a setmem or libcall instead.  */
  78
  79 #ifndef CLEAR_RATIO
  80 #if defined (HAVE_setmemqi) || defined (HAVE_setmemhi) || defined (HAVE_setmemsi) || defined (HAVE_setmemdi) || defined (HAVE_setmemti)
  81 #define CLEAR_RATIO(speed) 2
  82 #else
  83 /* If we are optimizing for space, cut down the default clear ratio.  */
  84 #define CLEAR_RATIO(speed) ((speed) ? 15 :3)
  85 #endif
  86 #endif
  87
  88 /* If a memory set (to value other than zero) operation would take
  89    SET_RATIO or more simple move-instruction sequences, we will do a movmem
  90    or libcall instead.  */
  91 #ifndef SET_RATIO
  92 #define SET_RATIO(speed) MOVE_RATIO(speed)
  93 #endif
  94 \f
  95 enum direction {none, upward, downward};
  96
  97 /* Structure to record the size of a sequence of arguments
  98    as the sum of a tree-expression and a constant.  This structure is
  99    also used to store offsets from the stack, which might be negative,
 100    so the variable part must be ssizetype, not sizetype.  */
 101
 102 struct args_size
 103 {
 104   HOST_WIDE_INT constant;
 105   tree var;
 106 };
 107
 108 /* Package up various arg related fields of struct args for
 109    locate_and_pad_parm.  */
 110 struct locate_and_pad_arg_data
 111 {
 112   /* Size of this argument on the stack, rounded up for any padding it
 113      gets.  If REG_PARM_STACK_SPACE is defined, then register parms are
 114      counted here, otherwise they aren't.  */
 115   struct args_size size;
 116   /* Offset of this argument from beginning of stack-args.  */
 117   struct args_size offset;
 118   /* Offset to the start of the stack slot.  Different from OFFSET
 119      if this arg pads downward.  */
 120   struct args_size slot_offset;
 121   /* The amount that the stack pointer needs to be adjusted to
 122      force alignment for the next argument.  */
 123   struct args_size alignment_pad;
 124   /* Which way we should pad this arg.  */
 125   enum direction where_pad;
 126   /* slot_offset is at least this aligned.  */
 127   unsigned int boundary;
 128 };
 129
 130 /* Add the value of the tree INC to the `struct args_size' TO.  */
 131
 132 #define ADD_PARM_SIZE(TO, INC)                                  \
 133 do {                                                            \
 134   tree inc = (INC);                                             \
 135   if (host_integerp (inc, 0))                                   \
 136     (TO).constant += tree_low_cst (inc, 0);                     \
 137   else if ((TO).var == 0)                                       \
 138     (TO).var = fold_convert (ssizetype, inc);                   \
 139   else                                                          \
 140     (TO).var = size_binop (PLUS_EXPR, (TO).var,                 \
 141                            fold_convert (ssizetype, inc));      \
 142 } while (0)
 143
 144 #define SUB_PARM_SIZE(TO, DEC)                                  \
 145 do {                                                            \
 146   tree dec = (DEC);                                             \
 147   if (host_integerp (dec, 0))                                   \
 148     (TO).constant -= tree_low_cst (dec, 0);                     \
 149   else if ((TO).var == 0)                                       \
 150     (TO).var = size_binop (MINUS_EXPR, ssize_int (0),           \
 151                            fold_convert (ssizetype, dec));      \
 152   else                                                          \
 153     (TO).var = size_binop (MINUS_EXPR, (TO).var,                \
 154                            fold_convert (ssizetype, dec));      \
 155 } while (0)
 156
 157 /* Convert the implicit sum in a `struct args_size' into a tree
 158    of type ssizetype.  */
 159 #define ARGS_SIZE_TREE(SIZE)                                    \
 160 ((SIZE).var == 0 ? ssize_int ((SIZE).constant)                  \
 161  : size_binop (PLUS_EXPR, fold_convert (ssizetype, (SIZE).var), \
 162                ssize_int ((SIZE).constant)))
 163
 164 /* Convert the implicit sum in a `struct args_size' into an rtx.  */
 165 #define ARGS_SIZE_RTX(SIZE)                                     \
 166 ((SIZE).var == 0 ? GEN_INT ((SIZE).constant)                    \
 167  : expand_normal (ARGS_SIZE_TREE (SIZE)))
 168
 169 /* Supply a default definition for FUNCTION_ARG_PADDING:
 170    usually pad upward, but pad short args downward on
 171    big-endian machines.  */
 172
 173 #define DEFAULT_FUNCTION_ARG_PADDING(MODE, TYPE)                        \
 174   (! BYTES_BIG_ENDIAN                                                   \
 175    ? upward                                                             \
 176    : (((MODE) == BLKmode                                                \
 177        ? ((TYPE) && TREE_CODE (TYPE_SIZE (TYPE)) == INTEGER_CST         \
 178           && int_size_in_bytes (TYPE) < (PARM_BOUNDARY / BITS_PER_UNIT)) \
 179        : GET_MODE_BITSIZE (MODE) < PARM_BOUNDARY)                       \
 180       ? downward : upward))
 181
 182 #ifndef FUNCTION_ARG_PADDING
 183 #define FUNCTION_ARG_PADDING(MODE, TYPE)        \
 184   DEFAULT_FUNCTION_ARG_PADDING ((MODE), (TYPE))
 185 #endif
 186
 187 /* Supply a default definition for FUNCTION_ARG_BOUNDARY.  Normally, we let
 188    FUNCTION_ARG_PADDING, which also pads the length, handle any needed
 189    alignment.  */
 190
 191 #ifndef FUNCTION_ARG_BOUNDARY
 192 #define FUNCTION_ARG_BOUNDARY(MODE, TYPE)       PARM_BOUNDARY
 193 #endif
 194
 195 /* Supply a default definition of STACK_SAVEAREA_MODE for emit_stack_save.
 196    Normally move_insn, so Pmode stack pointer.  */
 197
 198 #ifndef STACK_SAVEAREA_MODE
 199 #define STACK_SAVEAREA_MODE(LEVEL) Pmode
 200 #endif
 201
 202 /* Supply a default definition of STACK_SIZE_MODE for
 203    allocate_dynamic_stack_space.  Normally PLUS/MINUS, so word_mode.  */
 204
 205 #ifndef STACK_SIZE_MODE
 206 #define STACK_SIZE_MODE word_mode
 207 #endif
 208
 209 /* Provide default values for the macros controlling stack checking.  */
 210
 211 /* The default is neither full builtin stack checking...  */
 212 #ifndef STACK_CHECK_BUILTIN
 213 #define STACK_CHECK_BUILTIN 0
 214 #endif
 215
 216 /* ...nor static builtin stack checking.  */
 217 #ifndef STACK_CHECK_STATIC_BUILTIN
 218 #define STACK_CHECK_STATIC_BUILTIN 0
 219 #endif
 220
 221 /* The default interval is one page.  */
 222 #ifndef STACK_CHECK_PROBE_INTERVAL
 223 #define STACK_CHECK_PROBE_INTERVAL 4096
 224 #endif
 225
 226 /* The default is to do a store into the stack.  */
 227 #ifndef STACK_CHECK_PROBE_LOAD
 228 #define STACK_CHECK_PROBE_LOAD 0
 229 #endif
 230
 231 /* This is a kludge to try to capture the discrepancy between the old
 232    mechanism (generic stack checking) and the new mechanism (static
 233    builtin stack checking).  STACK_CHECK_PROTECT needs to be bumped
 234    for the latter because part of the protection area is effectively
 235    included in STACK_CHECK_MAX_FRAME_SIZE for the former.  */
 236 #ifdef STACK_CHECK_PROTECT
 237 #define STACK_OLD_CHECK_PROTECT STACK_CHECK_PROTECT
 238 #else
 239 #define STACK_OLD_CHECK_PROTECT \
 240  (USING_SJLJ_EXCEPTIONS ? 75 * UNITS_PER_WORD : 8 * 1024)
 241 #endif
 242
 243 /* Minimum amount of stack required to recover from an anticipated stack
 244    overflow detection.  The default value conveys an estimate of the amount
 245    of stack required to propagate an exception.  */
 246 #ifndef STACK_CHECK_PROTECT
 247 #define STACK_CHECK_PROTECT \
 248  (USING_SJLJ_EXCEPTIONS ? 75 * UNITS_PER_WORD : 12 * 1024)
 249 #endif
 250
 251 /* Make the maximum frame size be the largest we can and still only need
 252    one probe per function.  */
 253 #ifndef STACK_CHECK_MAX_FRAME_SIZE
 254 #define STACK_CHECK_MAX_FRAME_SIZE \
 255   (STACK_CHECK_PROBE_INTERVAL - UNITS_PER_WORD)
 256 #endif
 257
 258 /* This is arbitrary, but should be large enough everywhere.  */
 259 #ifndef STACK_CHECK_FIXED_FRAME_SIZE
 260 #define STACK_CHECK_FIXED_FRAME_SIZE (4 * UNITS_PER_WORD)
 261 #endif
 262
 263 /* Provide a reasonable default for the maximum size of an object to
 264    allocate in the fixed frame.  We may need to be able to make this
 265    controllable by the user at some point.  */
 266 #ifndef STACK_CHECK_MAX_VAR_SIZE
 267 #define STACK_CHECK_MAX_VAR_SIZE (STACK_CHECK_MAX_FRAME_SIZE / 100)
 268 #endif
 269 \f
 270 /* This structure is used to pass around information about exploded
 271    unary, binary and trinary expressions between expand_expr_real_1 and
 272    friends.  */
 273 typedef struct separate_ops
 274 {
 275   enum tree_code code;
 276   tree type;
 277   tree op0, op1, op2;
 278   location_t location;
 279 } *sepops;
 280 \f
 281 /* Functions from optabs.c, commonly used, and without need for the optabs
 282    tables:  */
 283
 284 /* Passed to expand_simple_binop and expand_binop to say which options
 285    to try to use if the requested operation can't be open-coded on the
 286    requisite mode.  Either OPTAB_LIB or OPTAB_LIB_WIDEN says try using
 287    a library call.  Either OPTAB_WIDEN or OPTAB_LIB_WIDEN says try
 288    using a wider mode.  OPTAB_MUST_WIDEN says try widening and don't
 289    try anything else.  */
 290
 291 enum optab_methods
 292 {
 293   OPTAB_DIRECT,
 294   OPTAB_LIB,
 295   OPTAB_WIDEN,
 296   OPTAB_LIB_WIDEN,
 297   OPTAB_MUST_WIDEN
 298 };
 299
 300 /* Generate code for a simple binary or unary operation.  "Simple" in
 301    this case means "can be unambiguously described by a (mode, code)
 302    pair and mapped to a single optab."  */
 303 extern rtx expand_simple_binop (enum machine_mode, enum rtx_code, rtx,
 304                                 rtx, rtx, int, enum optab_methods);
 305 extern rtx expand_simple_unop (enum machine_mode, enum rtx_code, rtx, rtx,
 306                                int);
 307
 308 /* Report whether the machine description contains an insn which can
 309    perform the operation described by CODE and MODE.  */
 310 extern int have_insn_for (enum rtx_code, enum machine_mode);
 311
 312 extern rtx prepare_operand (int, rtx, int, enum machine_mode, enum machine_mode,
 313                             int);
 314
 315 /* Emit code to make a call to a constant function or a library call.  */
 316 extern void emit_libcall_block (rtx, rtx, rtx, rtx);
 317
 318 /* Create but don't emit one rtl instruction to perform certain operations.
 319    Modes must match; operands must meet the operation's predicates.
 320    Likewise for subtraction and for just copying.  */
 321 extern rtx gen_add2_insn (rtx, rtx);
 322 extern rtx gen_add3_insn (rtx, rtx, rtx);
 323 extern rtx gen_sub2_insn (rtx, rtx);
 324 extern rtx gen_sub3_insn (rtx, rtx, rtx);
 325 extern rtx gen_move_insn (rtx, rtx);
 326 extern int have_add2_insn (rtx, rtx);
 327 extern int have_sub2_insn (rtx, rtx);
 328
 329 /* Emit a pair of rtl insns to compare two rtx's and to jump
 330    to a label if the comparison is true.  */
 331 extern void emit_cmp_and_jump_insns (rtx, rtx, enum rtx_code, rtx,
 332                                      enum machine_mode, int, rtx);
 333
 334 /* Generate code to indirectly jump to a location given in the rtx LOC.  */
 335 extern void emit_indirect_jump (rtx);
 336
 337 /* Generate a conditional trap instruction.  */
 338 extern rtx gen_cond_trap (enum rtx_code, rtx, rtx, rtx);
 339
 340 #include "insn-config.h"
 341
 342 #ifdef HAVE_conditional_move
 343 /* Emit a conditional move operation.  */
 344 rtx emit_conditional_move (rtx, enum rtx_code, rtx, rtx, enum machine_mode,
 345                            rtx, rtx, enum machine_mode, int);
 346
 347 /* Return nonzero if the conditional move is supported.  */
 348 int can_conditionally_move_p (enum machine_mode mode);
 349
 350 #endif
 351 rtx emit_conditional_add (rtx, enum rtx_code, rtx, rtx, enum machine_mode,
 352                           rtx, rtx, enum machine_mode, int);
 353
 354 rtx expand_val_compare_and_swap (rtx, rtx, rtx, rtx);
 355 rtx expand_bool_compare_and_swap (rtx, rtx, rtx, rtx);
 356 rtx expand_sync_operation (rtx, rtx, enum rtx_code);
 357 rtx expand_sync_fetch_operation (rtx, rtx, enum rtx_code, bool, rtx);
 358 rtx expand_sync_lock_test_and_set (rtx, rtx, rtx);
 359 \f
 360 /* Functions from expmed.c:  */
 361
 362 /* Arguments MODE, RTX: return an rtx for the negation of that value.
 363    May emit insns.  */
 364 extern rtx negate_rtx (enum machine_mode, rtx);
 365
 366 /* Expand a logical AND operation.  */
 367 extern rtx expand_and (enum machine_mode, rtx, rtx, rtx);
 368
 369 /* Emit a store-flag operation.  */
 370 extern rtx emit_store_flag (rtx, enum rtx_code, rtx, rtx, enum machine_mode,
 371                             int, int);
 372
 373 /* Like emit_store_flag, but always succeeds.  */
 374 extern rtx emit_store_flag_force (rtx, enum rtx_code, rtx, rtx,
 375                                   enum machine_mode, int, int);
 376 \f
 377 /* Functions from builtins.c:  */
 378 extern rtx expand_builtin (tree, rtx, rtx, enum machine_mode, int);
 379 extern tree std_build_builtin_va_list (void);
 380 extern tree std_fn_abi_va_list (tree);
 381 extern tree std_canonical_va_list_type (tree);
 382
 383 extern void std_expand_builtin_va_start (tree, rtx);
 384 extern rtx default_expand_builtin (tree, rtx, rtx, enum machine_mode, int);
 385 extern void expand_builtin_setjmp_setup (rtx, rtx);
 386 extern void expand_builtin_setjmp_receiver (rtx);
 387 extern rtx expand_builtin_saveregs (void);
 388 extern void expand_builtin_trap (void);
 389 extern rtx builtin_strncpy_read_str (void *, HOST_WIDE_INT, enum machine_mode);
 390 \f
 391 /* Functions from expr.c:  */
 392
 393 /* This is run during target initialization to set up which modes can be
 394    used directly in memory and to initialize the block move optab.  */
 395 extern void init_expr_target (void);
 396
 397 /* This is run at the start of compiling a function.  */
 398 extern void init_expr (void);
 399
 400 /* Emit some rtl insns to move data between rtx's, converting machine modes.
 401    Both modes must be floating or both fixed.  */
 402 extern void convert_move (rtx, rtx, int);
 403
 404 /* Convert an rtx to specified machine mode and return the result.  */
 405 extern rtx convert_to_mode (enum machine_mode, rtx, int);
 406
 407 /* Convert an rtx to MODE from OLDMODE and return the result.  */
 408 extern rtx convert_modes (enum machine_mode, enum machine_mode, rtx, int);
 409
 410 /* Emit code to move a block Y to a block X.  */
 411
 412 enum block_op_methods
 413 {
 414   BLOCK_OP_NORMAL,
 415   BLOCK_OP_NO_LIBCALL,
 416   BLOCK_OP_CALL_PARM,
 417   /* Like BLOCK_OP_NORMAL, but the libcall can be tail call optimized.  */
 418   BLOCK_OP_TAILCALL
 419 };
 420
 421 extern GTY(()) tree block_clear_fn;
 422 extern void init_block_move_fn (const char *);
 423 extern void init_block_clear_fn (const char *);
 424
 425 extern rtx emit_block_move (rtx, rtx, rtx, enum block_op_methods);
 426 extern rtx emit_block_move_via_libcall (rtx, rtx, rtx, bool);
 427 extern rtx emit_block_move_hints (rtx, rtx, rtx, enum block_op_methods,
 428                                   unsigned int, HOST_WIDE_INT);
 429
 430 /* Copy all or part of a value X into registers starting at REGNO.
 431    The number of registers to be filled is NREGS.  */
 432 extern void move_block_to_reg (int, rtx, int, enum machine_mode);
 433
 434 /* Copy all or part of a BLKmode value X out of registers starting at REGNO.
 435    The number of registers to be filled is NREGS.  */
 436 extern void move_block_from_reg (int, rtx, int);
 437
 438 /* Generate a non-consecutive group of registers represented by a PARALLEL.  */
 439 extern rtx gen_group_rtx (rtx);
 440
 441 /* Load a BLKmode value into non-consecutive registers represented by a
 442    PARALLEL.  */
 443 extern void emit_group_load (rtx, rtx, tree, int);
 444
 445 /* Similarly, but load into new temporaries.  */
 446 extern rtx emit_group_load_into_temps (rtx, rtx, tree, int);
 447
 448 /* Move a non-consecutive group of registers represented by a PARALLEL into
 449    a non-consecutive group of registers represented by a PARALLEL.  */
 450 extern void emit_group_move (rtx, rtx);
 451
 452 /* Move a group of registers represented by a PARALLEL into pseudos.  */
 453 extern rtx emit_group_move_into_temps (rtx);
 454
 455 /* Store a BLKmode value from non-consecutive registers represented by a
 456    PARALLEL.  */
 457 extern void emit_group_store (rtx, rtx, tree, int);
 458
 459 /* Copy BLKmode object from a set of registers.  */
 460 extern rtx copy_blkmode_from_reg (rtx, rtx, tree);
 461
 462 /* Mark REG as holding a parameter for the next CALL_INSN.  */
 463 extern void use_reg (rtx *, rtx);
 464
 465 /* Mark NREGS consecutive regs, starting at REGNO, as holding parameters
 466    for the next CALL_INSN.  */
 467 extern void use_regs (rtx *, int, int);
 468
 469 /* Mark a PARALLEL as holding a parameter for the next CALL_INSN.  */
 470 extern void use_group_regs (rtx *, rtx);
 471
 472 /* Write zeros through the storage of OBJECT.
 473    If OBJECT has BLKmode, SIZE is its length in bytes.  */
 474 extern rtx clear_storage (rtx, rtx, enum block_op_methods);
 475 extern rtx clear_storage_hints (rtx, rtx, enum block_op_methods,
 476                                 unsigned int, HOST_WIDE_INT);
 477 /* The same, but always output an library call.  */
 478 rtx set_storage_via_libcall (rtx, rtx, rtx, bool);
 479
 480 /* Expand a setmem pattern; return true if successful.  */
 481 extern bool set_storage_via_setmem (rtx, rtx, rtx, unsigned int,
 482                                     unsigned int, HOST_WIDE_INT);
 483
 484 /* Determine whether the LEN bytes can be moved by using several move
 485    instructions.  Return nonzero if a call to move_by_pieces should
 486    succeed.  */
 487 extern int can_move_by_pieces (unsigned HOST_WIDE_INT, unsigned int);
 488
 489 /* Return nonzero if it is desirable to store LEN bytes generated by
 490    CONSTFUN with several move instructions by store_by_pieces
 491    function.  CONSTFUNDATA is a pointer which will be passed as argument
 492    in every CONSTFUN call.
 493    ALIGN is maximum alignment we can assume.
 494    MEMSETP is true if this is a real memset/bzero, not a copy
 495    of a const string.  */
 496 extern int can_store_by_pieces (unsigned HOST_WIDE_INT,
 497                                 rtx (*) (void *, HOST_WIDE_INT,
 498                                          enum machine_mode),
 499                                 void *, unsigned int, bool);
 500
 501 /* Generate several move instructions to store LEN bytes generated by
 502    CONSTFUN to block TO.  (A MEM rtx with BLKmode).  CONSTFUNDATA is a
 503    pointer which will be passed as argument in every CONSTFUN call.
 504    ALIGN is maximum alignment we can assume.
 505    MEMSETP is true if this is a real memset/bzero, not a copy.
 506    Returns TO + LEN.  */
 507 extern rtx store_by_pieces (rtx, unsigned HOST_WIDE_INT,
 508                             rtx (*) (void *, HOST_WIDE_INT, enum machine_mode),
 509                             void *, unsigned int, bool, int);
 510
 511 /* Emit insns to set X from Y.  */
 512 extern rtx emit_move_insn (rtx, rtx);
 513
 514 /* Emit insns to set X from Y, with no frills.  */
 515 extern rtx emit_move_insn_1 (rtx, rtx);
 516
 517 extern rtx emit_move_complex_push (enum machine_mode, rtx, rtx);
 518 extern rtx emit_move_complex_parts (rtx, rtx);
 519
 520 /* Push a block of length SIZE (perhaps variable)
 521    and return an rtx to address the beginning of the block.  */
 522 extern rtx push_block (rtx, int, int);
 523
 524 /* Generate code to push something onto the stack, given its mode and type.  */
 525 extern void emit_push_insn (rtx, enum machine_mode, tree, rtx, unsigned int,
 526                             int, rtx, int, rtx, rtx, int, rtx);
 527
 528 /* Expand an assignment that stores the value of FROM into TO.  */
 529 extern void expand_assignment (tree, tree, bool);
 530
 531 /* Generate code for computing expression EXP,
 532    and storing the value into TARGET.
 533    If SUGGEST_REG is nonzero, copy the value through a register
 534    and return that register, if that is possible.  */
 535 extern rtx store_expr (tree, rtx, int, bool);
 536
 537 /* Given an rtx that may include add and multiply operations,
 538    generate them as insns and return a pseudo-reg containing the value.
 539    Useful after calling expand_expr with 1 as sum_ok.  */
 540 extern rtx force_operand (rtx, rtx);
 541
 542 /* Work horse for expand_expr.  */
 543 extern rtx expand_expr_real (tree, rtx, enum machine_mode,
 544                              enum expand_modifier, rtx *);
 545
 546 /* Generate code for computing expression EXP.
 547    An rtx for the computed value is returned.  The value is never null.
 548    In the case of a void EXP, const0_rtx is returned.  */
 549 static inline rtx
 550 expand_expr (tree exp, rtx target, enum machine_mode mode,
 551              enum expand_modifier modifier)
 552 {
 553   return expand_expr_real (exp, target, mode, modifier, NULL);
 554 }
 555
 556 static inline rtx
 557 expand_normal (tree exp)
 558 {
 559   return expand_expr_real (exp, NULL_RTX, VOIDmode, EXPAND_NORMAL, NULL);
 560 }
 561
 562 /* At the start of a function, record that we have no previously-pushed
 563    arguments waiting to be popped.  */
 564 extern void init_pending_stack_adjust (void);
 565
 566 /* Discard any pending stack adjustment.  */
 567 extern void discard_pending_stack_adjust (void);
 568
 569 /* When exiting from function, if safe, clear out any pending stack adjust
 570    so the adjustment won't get done.  */
 571 extern void clear_pending_stack_adjust (void);
 572
 573 /* Pop any previously-pushed arguments that have not been popped yet.  */
 574 extern void do_pending_stack_adjust (void);
 575
 576 /* Return the tree node and offset if a given argument corresponds to
 577    a string constant.  */
 578 extern tree string_constant (tree, tree *);
 579
 580 /* Generate code to evaluate EXP and jump to LABEL if the value is zero.  */
 581 extern void jumpifnot (tree, rtx);
 582
 583 /* Generate code to evaluate EXP and jump to LABEL if the value is nonzero.  */
 584 extern void jumpif (tree, rtx);
 585
 586 /* Generate code to evaluate EXP and jump to IF_FALSE_LABEL if
 587    the result is zero, or IF_TRUE_LABEL if the result is one.  */
 588 extern void do_jump (tree, rtx, rtx);
 589
 590 extern void do_compare_rtx_and_jump (rtx, rtx, enum rtx_code, int,
 591                                      enum machine_mode, rtx, rtx, rtx);
 592
 593 /* Two different ways of generating switch statements.  */
 594 extern int try_casesi (tree, tree, tree, tree, rtx, rtx, rtx);
 595 extern int try_tablejump (tree, tree, tree, tree, rtx, rtx);
 596
 597 /* Functions from alias.c */
 598 #include "alias.h"
 599
 600 \f
 601 /* rtl.h and tree.h were included.  */
 602 /* Return an rtx for the size in bytes of the value of an expr.  */
 603 extern rtx expr_size (tree);
 604
 605 /* Return a wide integer for the size in bytes of the value of EXP, or -1
 606    if the size can vary or is larger than an integer.  */
 607 extern HOST_WIDE_INT int_expr_size (tree);
 608
 609 /* Return an rtx that refers to the value returned by a function
 610    in its original home.  This becomes invalid if any more code is emitted.  */
 611 extern rtx hard_function_value (const_tree, const_tree, const_tree, int);
 612
 613 extern rtx prepare_call_address (rtx, rtx, rtx *, int, int);
 614
 615 extern bool shift_return_value (enum machine_mode, bool, rtx);
 616
 617 extern rtx expand_call (tree, rtx, int);
 618
 619 extern void fixup_tail_calls (void);
 620
 621 #ifdef TREE_CODE
 622 extern rtx expand_shift (enum tree_code, enum machine_mode, rtx, tree, rtx,
 623                          int);
 624 extern rtx expand_divmod (int, enum tree_code, enum machine_mode, rtx, rtx,
 625                           rtx, int);
 626 #endif
 627
 628 extern void locate_and_pad_parm (enum machine_mode, tree, int, int, tree,
 629                                  struct args_size *,
 630                                  struct locate_and_pad_arg_data *);
 631
 632 /* Return the CODE_LABEL rtx for a LABEL_DECL, creating it if necessary.  */
 633 extern rtx label_rtx (tree);
 634
 635 /* As label_rtx, but additionally the label is placed on the forced label
 636    list of its containing function (i.e. it is treated as reachable even
 637    if how is not obvious).  */
 638 extern rtx force_label_rtx (tree);
 639
 640 /* Return an rtx like arg but sans any constant terms.
 641    Returns the original rtx if it has no constant terms.
 642    The constant terms are added and stored via a second arg.  */
 643 extern rtx eliminate_constant_term (rtx, rtx *);
 644
 645 /* Convert arg to a valid memory address for specified machine mode,
 646    by emitting insns to perform arithmetic if nec.  */
 647 extern rtx memory_address (enum machine_mode, rtx);
 648
 649 /* Return a memory reference like MEMREF, but with its mode changed
 650    to MODE and its address changed to ADDR.
 651    (VOIDmode means don't change the mode.
 652    NULL for ADDR means don't change the address.)  */
 653 extern rtx change_address (rtx, enum machine_mode, rtx);
 654
 655 /* Return a memory reference like MEMREF, but with its mode changed
 656    to MODE and its address offset by OFFSET bytes.  */
 657 #define adjust_address(MEMREF, MODE, OFFSET) \
 658   adjust_address_1 (MEMREF, MODE, OFFSET, 1, 1)
 659
 660 /* Likewise, but the reference is not required to be valid.  */
 661 #define adjust_address_nv(MEMREF, MODE, OFFSET) \
 662   adjust_address_1 (MEMREF, MODE, OFFSET, 0, 1)
 663
 664 /* Return a memory reference like MEMREF, but with its mode changed
 665    to MODE and its address changed to ADDR, which is assumed to be
 666    increased by OFFSET bytes from MEMREF.  */
 667 #define adjust_automodify_address(MEMREF, MODE, ADDR, OFFSET) \
 668   adjust_automodify_address_1 (MEMREF, MODE, ADDR, OFFSET, 1)
 669
 670 /* Likewise, but the reference is not required to be valid.  */
 671 #define adjust_automodify_address_nv(MEMREF, MODE, ADDR, OFFSET) \
 672   adjust_automodify_address_1 (MEMREF, MODE, ADDR, OFFSET, 0)
 673
 674 extern rtx adjust_address_1 (rtx, enum machine_mode, HOST_WIDE_INT, int, int);
 675 extern rtx adjust_automodify_address_1 (rtx, enum machine_mode, rtx,
 676                                         HOST_WIDE_INT, int);
 677
 678 /* Return a memory reference like MEMREF, but whose address is changed by
 679    adding OFFSET, an RTX, to it.  POW2 is the highest power of two factor
 680    known to be in OFFSET (possibly 1).  */
 681 extern rtx offset_address (rtx, rtx, unsigned HOST_WIDE_INT);
 682
 683 /* Definitions from emit-rtl.c */
 684 #include "emit-rtl.h"
 685
 686 /* Return a memory reference like MEMREF, but with its mode widened to
 687    MODE and adjusted by OFFSET.  */
 688 extern rtx widen_memory_access (rtx, enum machine_mode, HOST_WIDE_INT);
 689
 690 /* Return a memory reference like MEMREF, but which is known to have a
 691    valid address.  */
 692 extern rtx validize_mem (rtx);
 693
 694 extern rtx use_anchored_address (rtx);
 695
 696 /* Given REF, a MEM, and T, either the type of X or the expression
 697    corresponding to REF, set the memory attributes.  OBJECTP is nonzero
 698    if we are making a new object of this type.  */
 699 extern void set_mem_attributes (rtx, tree, int);
 700
 701 /* Similar, except that BITPOS has not yet been applied to REF, so if
 702    we alter MEM_OFFSET according to T then we should subtract BITPOS
 703    expecting that it'll be added back in later.  */
 704 extern void set_mem_attributes_minus_bitpos (rtx, tree, int, HOST_WIDE_INT);
 705
 706 /* Return OFFSET if XEXP (MEM, 0) - OFFSET is known to be ALIGN
 707    bits aligned for 0 <= OFFSET < ALIGN / BITS_PER_UNIT, or
 708    -1 if not known.  */
 709 extern int get_mem_align_offset (rtx, unsigned int);
 710
 711 /* Assemble the static constant template for function entry trampolines.  */
 712 extern rtx assemble_trampoline_template (void);
 713
 714 /* Copy given rtx to a new temp reg and return that.  */
 715 extern rtx copy_to_reg (rtx);
 716
 717 /* Like copy_to_reg but always make the reg Pmode.  */
 718 extern rtx copy_addr_to_reg (rtx);
 719
 720 /* Like copy_to_reg but always make the reg the specified mode MODE.  */
 721 extern rtx copy_to_mode_reg (enum machine_mode, rtx);
 722
 723 /* Copy given rtx to given temp reg and return that.  */
 724 extern rtx copy_to_suggested_reg (rtx, rtx, enum machine_mode);
 725
 726 /* Copy a value to a register if it isn't already a register.
 727    Args are mode (in case value is a constant) and the value.  */
 728 extern rtx force_reg (enum machine_mode, rtx);
 729
 730 /* Return given rtx, copied into a new temp reg if it was in memory.  */
 731 extern rtx force_not_mem (rtx);
 732
 733 /* Return mode and signedness to use when an argument or result in the
 734    given mode is promoted.  */
 735 extern enum machine_mode promote_function_mode (const_tree, enum machine_mode, int *,
 736                                                 const_tree, int);
 737
 738 /* Return mode and signedness to use when an object in the given mode
 739    is promoted.  */
 740 extern enum machine_mode promote_mode (const_tree, enum machine_mode, int *);
 741
 742 /* Return mode and signedness to use when object is promoted.  */
 743 enum machine_mode promote_decl_mode (const_tree, int *);
 744
 745 /* Remove some bytes from the stack.  An rtx says how many.  */
 746 extern void adjust_stack (rtx);
 747
 748 /* Add some bytes to the stack.  An rtx says how many.  */
 749 extern void anti_adjust_stack (rtx);
 750
 751 /* This enum is used for the following two functions.  */
 752 enum save_level {SAVE_BLOCK, SAVE_FUNCTION, SAVE_NONLOCAL};
 753
 754 /* Save the stack pointer at the specified level.  */
 755 extern void emit_stack_save (enum save_level, rtx *, rtx);
 756
 757 /* Restore the stack pointer from a save area of the specified level.  */
 758 extern void emit_stack_restore (enum save_level, rtx, rtx);
 759
 760 /* Invoke emit_stack_save for the nonlocal_goto_save_area.  */
 761 extern void update_nonlocal_goto_save_area (void);
 762
 763 /* Allocate some space on the stack dynamically and return its address.  An rtx
 764    says how many bytes.  */
 765 extern rtx allocate_dynamic_stack_space (rtx, rtx, int);
 766
 767 /* Probe a range of stack addresses from FIRST to FIRST+SIZE, inclusive.
 768    FIRST is a constant and size is a Pmode RTX.  These are offsets from the
 769    current stack pointer.  STACK_GROWS_DOWNWARD says whether to add or
 770    subtract from the stack.  If SIZE is constant, this is done
 771    with a fixed number of probes.  Otherwise, we must make a loop.  */
 772 extern void probe_stack_range (HOST_WIDE_INT, rtx);
 773
 774 /* Return an rtx that refers to the value returned by a library call
 775    in its original home.  This becomes invalid if any more code is emitted.  */
 776 extern rtx hard_libcall_value (enum machine_mode, rtx);
 777
 778 /* Return the mode desired by operand N of a particular bitfield
 779    insert/extract insn, or MAX_MACHINE_MODE if no such insn is
 780    available.  */
 781
 782 enum extraction_pattern { EP_insv, EP_extv, EP_extzv };
 783 extern enum machine_mode
 784 mode_for_extraction (enum extraction_pattern, int);
 785
 786 extern void store_bit_field (rtx, unsigned HOST_WIDE_INT,
 787                              unsigned HOST_WIDE_INT, enum machine_mode, rtx);
 788 extern rtx extract_bit_field (rtx, unsigned HOST_WIDE_INT,
 789                               unsigned HOST_WIDE_INT, int, rtx,
 790                               enum machine_mode, enum machine_mode);
 791 extern rtx extract_low_bits (enum machine_mode, enum machine_mode, rtx);
 792 extern rtx expand_mult (enum machine_mode, rtx, rtx, rtx, int);
 793 extern rtx expand_mult_highpart_adjust (enum machine_mode, rtx, rtx, rtx, rtx, int);
 794
 795 extern rtx assemble_static_space (unsigned HOST_WIDE_INT);
 796 extern int safe_from_p (const_rtx, tree, int);
 797 extern bool split_comparison (enum rtx_code, enum machine_mode,
 798                               enum rtx_code *, enum rtx_code *);
 799
 800 /* Call this once to initialize the contents of the optabs
 801    appropriately for the current target machine.  */
 802 extern void init_optabs (void);
 803 extern void init_all_optabs (void);
 804
 805 /* Call this to initialize an optab function entry.  */
 806 extern rtx init_one_libfunc (const char *);
 807 extern rtx set_user_assembler_libfunc (const char *, const char *);
 808
 809 extern int vector_mode_valid_p (enum machine_mode);
 810
 811 #endif /* GCC_EXPR_H */