gcc/expr.h

   1 /* Definitions for code generation pass of GNU compiler.
   2    Copyright (C) 1987, 91-97, 1998 Free Software Foundation, Inc.
   3
   4 This file is part of GNU CC.
   5
   6 GNU CC is free software; you can redistribute it and/or modify
   7 it under the terms of the GNU General Public License as published by
   8 the Free Software Foundation; either version 2, or (at your option)
   9 any later version.
  10
  11 GNU CC is distributed in the hope that it will be useful,
  12 but WITHOUT ANY WARRANTY; without even the implied warranty of
  13 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  14 GNU General Public License for more details.
  15
  16 You should have received a copy of the GNU General Public License
  17 along with GNU CC; see the file COPYING.  If not, write to
  18 the Free Software Foundation, 59 Temple Place - Suite 330,
  19 Boston, MA 02111-1307, USA.  */
  20
  21 /* The default branch cost is 1.  */
  22 #ifndef BRANCH_COST
  23 #define BRANCH_COST 1
  24 #endif
  25
  26 /* Macros to access the slots of a QUEUED rtx.
  27    Here rather than in rtl.h because only the expansion pass
  28    should ever encounter a QUEUED.  */
  29
  30 /* The variable for which an increment is queued.  */
  31 #define QUEUED_VAR(P) XEXP (P, 0)
  32 /* If the increment has been emitted, this is the insn
  33    that does the increment.  It is zero before the increment is emitted.  */
  34 #define QUEUED_INSN(P) XEXP (P, 1)
  35 /* If a pre-increment copy has been generated, this is the copy
  36    (it is a temporary reg).  Zero if no copy made yet.  */
  37 #define QUEUED_COPY(P) XEXP (P, 2)
  38 /* This is the body to use for the insn to do the increment.
  39    It is used to emit the increment.  */
  40 #define QUEUED_BODY(P) XEXP (P, 3)
  41 /* Next QUEUED in the queue.  */
  42 #define QUEUED_NEXT(P) XEXP (P, 4)
  43
  44 /* This is the 4th arg to `expand_expr'.
  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_MEMORY_USE_* are explained below.  */
  50 enum expand_modifier {EXPAND_NORMAL, EXPAND_SUM,
  51                       EXPAND_CONST_ADDRESS, EXPAND_INITIALIZER,
  52                       EXPAND_MEMORY_USE_WO, EXPAND_MEMORY_USE_RW,
  53                       EXPAND_MEMORY_USE_BAD, EXPAND_MEMORY_USE_DONT};
  54
  55 /* Argument for chkr_* functions.
  56    MEMORY_USE_RO: the pointer reads memory.
  57    MEMORY_USE_WO: the pointer writes to memory.
  58    MEMORY_USE_RW: the pointer modifies memory (ie it reads and writes). An
  59                   example is (*ptr)++
  60    MEMORY_USE_BAD: use this if you don't know the behavior of the pointer, or
  61                    if you know there are no pointers.  Using an INDIRECT_REF
  62                    with MEMORY_USE_BAD will abort.
  63    MEMORY_USE_TW: just test for writing, without update.  Special.
  64    MEMORY_USE_DONT: the memory is neither read nor written.  This is used by
  65                    '->' and '.'.  */
  66 enum memory_use_mode {MEMORY_USE_BAD = 0, MEMORY_USE_RO = 1,
  67                       MEMORY_USE_WO = 2, MEMORY_USE_RW = 3,
  68                       MEMORY_USE_TW = 6, MEMORY_USE_DONT = 99};
  69
  70 /* List of labels that must never be deleted.  */
  71 extern rtx forced_labels;
  72
  73 /* List (chain of EXPR_LISTs) of pseudo-regs of SAVE_EXPRs.
  74    So we can mark them all live at the end of the function, if stupid.  */
  75 extern rtx save_expr_regs;
  76
  77 extern int current_function_calls_alloca;
  78 extern int current_function_outgoing_args_size;
  79
  80 /* This is the offset from the arg pointer to the place where the first
  81    anonymous arg can be found, if there is one.  */
  82 extern rtx current_function_arg_offset_rtx;
  83
  84 /* This is nonzero if the current function uses the constant pool.  */
  85 extern int current_function_uses_const_pool;
  86
  87 /* This is nonzero if the current function uses pic_offset_table_rtx.  */
  88 extern int current_function_uses_pic_offset_table;
  89
  90 /* The arg pointer hard register, or the pseudo into which it was copied.  */
  91 extern rtx current_function_internal_arg_pointer;
  92
  93 /* Nonzero means stack pops must not be deferred, and deferred stack
  94    pops must not be output.  It is nonzero inside a function call,
  95    inside a conditional expression, inside a statement expression,
  96    and in other cases as well.  */
  97 extern int inhibit_defer_pop;
  98
  99 /* Number of function calls seen so far in current function.  */
 100
 101 extern int function_call_count;
 102
 103 /* RTX for stack slot that holds the current handler for nonlocal gotos.
 104    Zero when function does not have nonlocal labels.  */
 105
 106 extern rtx nonlocal_goto_handler_slot;
 107
 108 /* RTX for stack slot that holds the stack pointer value to restore
 109    for a nonlocal goto.
 110    Zero when function does not have nonlocal labels.  */
 111
 112 extern rtx nonlocal_goto_stack_level;
 113
 114 /* List (chain of TREE_LIST) of LABEL_DECLs for all nonlocal labels
 115    (labels to which there can be nonlocal gotos from nested functions)
 116    in this function.  */
 117
 118 #ifdef TREE_CODE   /* Don't lose if tree.h not included.  */
 119 extern tree nonlocal_labels;
 120 #endif
 121
 122 #define NO_DEFER_POP (inhibit_defer_pop += 1)
 123 #define OK_DEFER_POP (inhibit_defer_pop -= 1)
 124
 125 /* Number of units that we should eventually pop off the stack.
 126    These are the arguments to function calls that have already returned.  */
 127 extern int pending_stack_adjust;
 128
 129 /* When temporaries are created by TARGET_EXPRs, they are created at
 130    this level of temp_slot_level, so that they can remain allocated
 131    until no longer needed.  CLEANUP_POINT_EXPRs define the lifetime
 132    of TARGET_EXPRs.  */
 133 extern int target_temp_slot_level;
 134 \f
 135 #ifdef TREE_CODE /* Don't lose if tree.h not included.  */
 136 /* Structure to record the size of a sequence of arguments
 137    as the sum of a tree-expression and a constant.  */
 138
 139 struct args_size
 140 {
 141   HOST_WIDE_INT constant;
 142   tree var;
 143 };
 144 #endif
 145
 146 /* Add the value of the tree INC to the `struct args_size' TO.  */
 147
 148 #define ADD_PARM_SIZE(TO, INC)  \
 149 { tree inc = (INC);                             \
 150   if (TREE_CODE (inc) == INTEGER_CST)           \
 151     (TO).constant += TREE_INT_CST_LOW (inc);    \
 152   else if ((TO).var == 0)                       \
 153     (TO).var = inc;                             \
 154   else                                          \
 155     (TO).var = size_binop (PLUS_EXPR, (TO).var, inc); }
 156
 157 #define SUB_PARM_SIZE(TO, DEC)  \
 158 { tree dec = (DEC);                             \
 159   if (TREE_CODE (dec) == INTEGER_CST)           \
 160     (TO).constant -= TREE_INT_CST_LOW (dec);    \
 161   else if ((TO).var == 0)                       \
 162     (TO).var = size_binop (MINUS_EXPR, integer_zero_node, dec); \
 163   else                                          \
 164     (TO).var = size_binop (MINUS_EXPR, (TO).var, dec); }
 165
 166 /* Convert the implicit sum in a `struct args_size' into an rtx.  */
 167 #define ARGS_SIZE_RTX(SIZE)                                             \
 168 ((SIZE).var == 0 ? GEN_INT ((SIZE).constant)    \
 169  : expand_expr (size_binop (PLUS_EXPR, (SIZE).var,                      \
 170                             size_int ((SIZE).constant)),                \
 171                 NULL_RTX, VOIDmode, EXPAND_MEMORY_USE_BAD))
 172
 173 /* Convert the implicit sum in a `struct args_size' into a tree.  */
 174 #define ARGS_SIZE_TREE(SIZE)                                            \
 175 ((SIZE).var == 0 ? size_int ((SIZE).constant)                           \
 176  : size_binop (PLUS_EXPR, (SIZE).var, size_int ((SIZE).constant)))
 177
 178 /* Supply a default definition for FUNCTION_ARG_PADDING:
 179    usually pad upward, but pad short args downward on
 180    big-endian machines.  */
 181
 182 enum direction {none, upward, downward};  /* Value has this type.  */
 183
 184 #ifndef FUNCTION_ARG_PADDING
 185 #define FUNCTION_ARG_PADDING(MODE, TYPE)                                \
 186   (! BYTES_BIG_ENDIAN                                                   \
 187    ? upward                                                             \
 188    : (((MODE) == BLKmode                                                \
 189        ? ((TYPE) && TREE_CODE (TYPE_SIZE (TYPE)) == INTEGER_CST         \
 190           && int_size_in_bytes (TYPE) < (PARM_BOUNDARY / BITS_PER_UNIT)) \
 191        : GET_MODE_BITSIZE (MODE) < PARM_BOUNDARY)                       \
 192       ? downward : upward))
 193 #endif
 194
 195 /* Supply a default definition for FUNCTION_ARG_BOUNDARY.  Normally, we let
 196    FUNCTION_ARG_PADDING, which also pads the length, handle any needed
 197    alignment.  */
 198
 199 #ifndef FUNCTION_ARG_BOUNDARY
 200 #define FUNCTION_ARG_BOUNDARY(MODE, TYPE)       PARM_BOUNDARY
 201 #endif
 202
 203 /* Nonzero if we do not know how to pass TYPE solely in registers.
 204    We cannot do so in the following cases:
 205
 206    - if the type has variable size
 207    - if the type is marked as addressable (it is required to be constructed
 208      into the stack)
 209    - if the padding and mode of the type is such that a copy into a register
 210      would put it into the wrong part of the register.
 211
 212    Which padding can't be supported depends on the byte endianness.
 213
 214    A value in a register is implicitly padded at the most significant end.
 215    On a big-endian machine, that is the lower end in memory.
 216    So a value padded in memory at the upper end can't go in a register.
 217    For a little-endian machine, the reverse is true.  */
 218
 219 #define MUST_PASS_IN_STACK(MODE,TYPE)                   \
 220   ((TYPE) != 0                                          \
 221    && (TREE_CODE (TYPE_SIZE (TYPE)) != INTEGER_CST      \
 222        || TREE_ADDRESSABLE (TYPE)                       \
 223        || ((MODE) == BLKmode                            \
 224            && ! ((TYPE) != 0 && TREE_CODE (TYPE_SIZE (TYPE)) == INTEGER_CST \
 225                  && 0 == (int_size_in_bytes (TYPE)      \
 226                           % (PARM_BOUNDARY / BITS_PER_UNIT))) \
 227            && (FUNCTION_ARG_PADDING (MODE, TYPE)        \
 228                == (BYTES_BIG_ENDIAN ? upward : downward)))))
 229
 230 /* Nonzero if type TYPE should be returned in memory.
 231    Most machines can use the following default definition.  */
 232
 233 #ifndef RETURN_IN_MEMORY
 234 #define RETURN_IN_MEMORY(TYPE) (TYPE_MODE (TYPE) == BLKmode)
 235 #endif
 236
 237 /* Provide default values for the macros controlling stack checking.  */
 238
 239 #ifndef STACK_CHECK_BUILTIN
 240 #define STACK_CHECK_BUILTIN 0
 241 #endif
 242
 243 /* The default interval is one page.  */
 244 #ifndef STACK_CHECK_PROBE_INTERVAL
 245 #define STACK_CHECK_PROBE_INTERVAL 4096
 246 #endif
 247
 248 /* The default is to do a store into the stack.  */
 249 #ifndef STACK_CHECK_PROBE_LOAD
 250 #define STACK_CHECK_PROBE_LOAD 0
 251 #endif
 252
 253 /* This value is arbitrary, but should be sufficient for most machines.  */
 254 #ifndef STACK_CHECK_PROTECT
 255 #define STACK_CHECK_PROTECT (75 * UNITS_PER_WORD)
 256 #endif
 257
 258 /* Make the maximum frame size be the largest we can and still only need
 259    one probe per function.  */
 260 #ifndef STACK_CHECK_MAX_FRAME_SIZE
 261 #define STACK_CHECK_MAX_FRAME_SIZE \
 262   (STACK_CHECK_PROBE_INTERVAL - UNITS_PER_WORD)
 263 #endif
 264
 265 /* This is arbitrary, but should be large enough everywhere.  */
 266 #ifndef STACK_CHECK_FIXED_FRAME_SIZE
 267 #define STACK_CHECK_FIXED_FRAME_SIZE (4 * UNITS_PER_WORD)
 268 #endif
 269
 270 /* Provide a reasonable default for the maximum size of an object to
 271    allocate in the fixed frame.  We may need to be able to make this
 272    controllable by the user at some point.  */
 273 #ifndef STACK_CHECK_MAX_VAR_SIZE
 274 #define STACK_CHECK_MAX_VAR_SIZE (STACK_CHECK_MAX_FRAME_SIZE / 100)
 275 #endif
 276 \f
 277 /* Optabs are tables saying how to generate insn bodies
 278    for various machine modes and numbers of operands.
 279    Each optab applies to one operation.
 280    For example, add_optab applies to addition.
 281
 282    The insn_code slot is the enum insn_code that says how to
 283    generate an insn for this operation on a particular machine mode.
 284    It is CODE_FOR_nothing if there is no such insn on the target machine.
 285
 286    The `lib_call' slot is the name of the library function that
 287    can be used to perform the operation.
 288
 289    A few optabs, such as move_optab and cmp_optab, are used
 290    by special code.  */
 291
 292 /* Everything that uses expr.h needs to define enum insn_code
 293    but we don't list it in the Makefile dependencies just for that.  */
 294 #include "insn-codes.h"
 295
 296 typedef struct optab
 297 {
 298   enum rtx_code code;
 299   struct {
 300     enum insn_code insn_code;
 301     rtx libfunc;
 302   } handlers [NUM_MACHINE_MODES];
 303 } * optab;
 304
 305 /* Given an enum insn_code, access the function to construct
 306    the body of that kind of insn.  */
 307 #ifdef FUNCTION_CONVERSION_BUG
 308 /* Some compilers fail to convert a function properly to a
 309    pointer-to-function when used as an argument.
 310    So produce the pointer-to-function directly.
 311    Luckily, these compilers seem to work properly when you
 312    call the pointer-to-function.  */
 313 #define GEN_FCN(CODE) (insn_gen_function[(int) (CODE)])
 314 #else
 315 #define GEN_FCN(CODE) (*insn_gen_function[(int) (CODE)])
 316 #endif
 317
 318 extern rtx (*const insn_gen_function[]) ();
 319
 320 extern optab add_optab;
 321 extern optab sub_optab;
 322 extern optab smul_optab;        /* Signed and floating-point multiply */
 323 extern optab smul_highpart_optab; /* Signed multiply, return high word */
 324 extern optab umul_highpart_optab;
 325 extern optab smul_widen_optab;  /* Signed multiply with result
 326                                    one machine mode wider than args */
 327 extern optab umul_widen_optab;
 328 extern optab sdiv_optab;        /* Signed divide */
 329 extern optab sdivmod_optab;     /* Signed divide-and-remainder in one */
 330 extern optab udiv_optab;
 331 extern optab udivmod_optab;
 332 extern optab smod_optab;        /* Signed remainder */
 333 extern optab umod_optab;
 334 extern optab flodiv_optab;      /* Optab for floating divide. */
 335 extern optab ftrunc_optab;      /* Convert float to integer in float fmt */
 336 extern optab and_optab;         /* Logical and */
 337 extern optab ior_optab;         /* Logical or */
 338 extern optab xor_optab;         /* Logical xor */
 339 extern optab ashl_optab;        /* Arithmetic shift left */
 340 extern optab ashr_optab;        /* Arithmetic shift right */
 341 extern optab lshr_optab;        /* Logical shift right */
 342 extern optab rotl_optab;        /* Rotate left */
 343 extern optab rotr_optab;        /* Rotate right */
 344 extern optab smin_optab;        /* Signed and floating-point minimum value */
 345 extern optab smax_optab;        /* Signed and floating-point maximum value */
 346 extern optab umin_optab;        /* Unsigned minimum value */
 347 extern optab umax_optab;        /* Unsigned maximum value */
 348
 349 extern optab mov_optab;         /* Move instruction.  */
 350 extern optab movstrict_optab;   /* Move, preserving high part of register.  */
 351
 352 extern optab cmp_optab;         /* Compare insn; two operands.  */
 353 extern optab tst_optab;         /* tst insn; compare one operand against 0 */
 354
 355 /* Unary operations */
 356 extern optab neg_optab;         /* Negation */
 357 extern optab abs_optab;         /* Abs value */
 358 extern optab one_cmpl_optab;    /* Bitwise not */
 359 extern optab ffs_optab;         /* Find first bit set */
 360 extern optab sqrt_optab;        /* Square root */
 361 extern optab sin_optab;         /* Sine */
 362 extern optab cos_optab;         /* Cosine */
 363 extern optab strlen_optab;      /* String length */
 364
 365 /* Tables of patterns for extending one integer mode to another.  */
 366 extern enum insn_code extendtab[MAX_MACHINE_MODE][MAX_MACHINE_MODE][2];
 367
 368 /* Tables of patterns for converting between fixed and floating point. */
 369 extern enum insn_code fixtab[NUM_MACHINE_MODES][NUM_MACHINE_MODES][2];
 370 extern enum insn_code fixtrunctab[NUM_MACHINE_MODES][NUM_MACHINE_MODES][2];
 371 extern enum insn_code floattab[NUM_MACHINE_MODES][NUM_MACHINE_MODES][2];
 372
 373 /* Contains the optab used for each rtx code.  */
 374 extern optab code_to_optab[NUM_RTX_CODE + 1];
 375
 376 /* Passed to expand_binop and expand_unop to say which options to try to use
 377    if the requested operation can't be open-coded on the requisite mode.
 378    Either OPTAB_LIB or OPTAB_LIB_WIDEN says try using a library call.
 379    Either OPTAB_WIDEN or OPTAB_LIB_WIDEN says try using a wider mode.
 380    OPTAB_MUST_WIDEN says try widening and don't try anything else.  */
 381
 382 enum optab_methods
 383 {
 384   OPTAB_DIRECT,
 385   OPTAB_LIB,
 386   OPTAB_WIDEN,
 387   OPTAB_LIB_WIDEN,
 388   OPTAB_MUST_WIDEN
 389 };
 390
 391 /* SYMBOL_REF rtx's for the library functions that are called
 392    implicitly and not via optabs.  */
 393
 394 extern rtx extendsfdf2_libfunc;
 395 extern rtx extendsfxf2_libfunc;
 396 extern rtx extendsftf2_libfunc;
 397 extern rtx extenddfxf2_libfunc;
 398 extern rtx extenddftf2_libfunc;
 399
 400 extern rtx truncdfsf2_libfunc;
 401 extern rtx truncxfsf2_libfunc;
 402 extern rtx trunctfsf2_libfunc;
 403 extern rtx truncxfdf2_libfunc;
 404 extern rtx trunctfdf2_libfunc;
 405
 406 extern rtx memcpy_libfunc;
 407 extern rtx bcopy_libfunc;
 408 extern rtx memcmp_libfunc;
 409 extern rtx bcmp_libfunc;
 410 extern rtx memset_libfunc;
 411 extern rtx bzero_libfunc;
 412
 413 extern rtx throw_libfunc;
 414 extern rtx sjthrow_libfunc;
 415 extern rtx sjpopnthrow_libfunc;
 416 extern rtx terminate_libfunc;
 417 extern rtx setjmp_libfunc;
 418 extern rtx longjmp_libfunc;
 419
 420 extern rtx eqhf2_libfunc;
 421 extern rtx nehf2_libfunc;
 422 extern rtx gthf2_libfunc;
 423 extern rtx gehf2_libfunc;
 424 extern rtx lthf2_libfunc;
 425 extern rtx lehf2_libfunc;
 426
 427 extern rtx eqsf2_libfunc;
 428 extern rtx nesf2_libfunc;
 429 extern rtx gtsf2_libfunc;
 430 extern rtx gesf2_libfunc;
 431 extern rtx ltsf2_libfunc;
 432 extern rtx lesf2_libfunc;
 433
 434 extern rtx eqdf2_libfunc;
 435 extern rtx nedf2_libfunc;
 436 extern rtx gtdf2_libfunc;
 437 extern rtx gedf2_libfunc;
 438 extern rtx ltdf2_libfunc;
 439 extern rtx ledf2_libfunc;
 440
 441 extern rtx eqxf2_libfunc;
 442 extern rtx nexf2_libfunc;
 443 extern rtx gtxf2_libfunc;
 444 extern rtx gexf2_libfunc;
 445 extern rtx ltxf2_libfunc;
 446 extern rtx lexf2_libfunc;
 447
 448 extern rtx eqtf2_libfunc;
 449 extern rtx netf2_libfunc;
 450 extern rtx gttf2_libfunc;
 451 extern rtx getf2_libfunc;
 452 extern rtx lttf2_libfunc;
 453 extern rtx letf2_libfunc;
 454
 455 extern rtx floatsisf_libfunc;
 456 extern rtx floatdisf_libfunc;
 457 extern rtx floattisf_libfunc;
 458
 459 extern rtx floatsidf_libfunc;
 460 extern rtx floatdidf_libfunc;
 461 extern rtx floattidf_libfunc;
 462
 463 extern rtx floatsixf_libfunc;
 464 extern rtx floatdixf_libfunc;
 465 extern rtx floattixf_libfunc;
 466
 467 extern rtx floatsitf_libfunc;
 468 extern rtx floatditf_libfunc;
 469 extern rtx floattitf_libfunc;
 470
 471 extern rtx fixsfsi_libfunc;
 472 extern rtx fixsfdi_libfunc;
 473 extern rtx fixsfti_libfunc;
 474
 475 extern rtx fixdfsi_libfunc;
 476 extern rtx fixdfdi_libfunc;
 477 extern rtx fixdfti_libfunc;
 478
 479 extern rtx fixxfsi_libfunc;
 480 extern rtx fixxfdi_libfunc;
 481 extern rtx fixxfti_libfunc;
 482
 483 extern rtx fixtfsi_libfunc;
 484 extern rtx fixtfdi_libfunc;
 485 extern rtx fixtfti_libfunc;
 486
 487 extern rtx fixunssfsi_libfunc;
 488 extern rtx fixunssfdi_libfunc;
 489 extern rtx fixunssfti_libfunc;
 490
 491 extern rtx fixunsdfsi_libfunc;
 492 extern rtx fixunsdfdi_libfunc;
 493 extern rtx fixunsdfti_libfunc;
 494
 495 extern rtx fixunsxfsi_libfunc;
 496 extern rtx fixunsxfdi_libfunc;
 497 extern rtx fixunsxfti_libfunc;
 498
 499 extern rtx fixunstfsi_libfunc;
 500 extern rtx fixunstfdi_libfunc;
 501 extern rtx fixunstfti_libfunc;
 502
 503 /* For check-memory-usage.  */
 504 extern rtx chkr_check_addr_libfunc;
 505 extern rtx chkr_set_right_libfunc;
 506 extern rtx chkr_copy_bitmap_libfunc;
 507 extern rtx chkr_check_exec_libfunc;
 508 extern rtx chkr_check_str_libfunc;
 509 \f
 510 typedef rtx (*rtxfun) ();
 511
 512 /* Indexed by the rtx-code for a conditional (eg. EQ, LT,...)
 513    gives the gen_function to make a branch to test that condition.  */
 514
 515 extern rtxfun bcc_gen_fctn[NUM_RTX_CODE];
 516
 517 /* Indexed by the rtx-code for a conditional (eg. EQ, LT,...)
 518    gives the insn code to make a store-condition insn
 519    to test that condition.  */
 520
 521 extern enum insn_code setcc_gen_code[NUM_RTX_CODE];
 522
 523 #ifdef HAVE_conditional_move
 524 /* Indexed by the the machine mode, gives the insn code to make a conditional
 525    move insn.  */
 526
 527 extern enum insn_code movcc_gen_code[NUM_MACHINE_MODES];
 528 #endif
 529
 530 /* This array records the insn_code of insns to perform block moves.  */
 531 extern enum insn_code movstr_optab[NUM_MACHINE_MODES];
 532
 533 /* This array records the insn_code of insns to perform block clears.  */
 534 extern enum insn_code clrstr_optab[NUM_MACHINE_MODES];
 535
 536 /* Define functions given in optabs.c.  */
 537
 538 /* Expand a binary operation given optab and rtx operands.  */
 539 extern rtx expand_binop PROTO((enum machine_mode, optab, rtx, rtx, rtx,
 540                                int, enum optab_methods));
 541
 542 /* Expand a binary operation with both signed and unsigned forms.  */
 543 extern rtx sign_expand_binop PROTO((enum machine_mode, optab, optab, rtx,
 544                                     rtx, rtx, int, enum optab_methods));
 545
 546 /* Generate code to perform an operation on two operands with two results.  */
 547 extern int expand_twoval_binop PROTO((optab, rtx, rtx, rtx, rtx, int));
 548
 549 /* Expand a unary arithmetic operation given optab rtx operand.  */
 550 extern rtx expand_unop PROTO((enum machine_mode, optab, rtx, rtx, int));
 551
 552 /* Expand the absolute value operation.  */
 553 extern rtx expand_abs PROTO((enum machine_mode, rtx, rtx, int, int));
 554
 555 /* Expand the complex absolute value operation.  */
 556 extern rtx expand_complex_abs PROTO((enum machine_mode, rtx, rtx, int));
 557
 558 /* Generate an instruction with a given INSN_CODE with an output and
 559    an input.  */
 560 extern void emit_unop_insn PROTO((int, rtx, rtx, enum rtx_code));
 561
 562 /* Emit code to perform a series of operations on a multi-word quantity, one
 563    word at a time.  */
 564 extern rtx emit_no_conflict_block PROTO((rtx, rtx, rtx, rtx, rtx));
 565
 566 /* Emit code to make a call to a constant function or a library call. */
 567 extern void emit_libcall_block PROTO((rtx, rtx, rtx, rtx));
 568
 569 /* Emit one rtl instruction to store zero in specified rtx.  */
 570 extern void emit_clr_insn PROTO((rtx));
 571
 572 /* Emit one rtl insn to store 1 in specified rtx assuming it contains 0.  */
 573 extern void emit_0_to_1_insn PROTO((rtx));
 574
 575 /* Emit one rtl insn to compare two rtx's.  */
 576 extern void emit_cmp_insn PROTO((rtx, rtx, enum rtx_code, rtx,
 577                                  enum machine_mode, int, int));
 578
 579 /* Nonzero if a compare of mode MODE can be done straightforwardly
 580    (without splitting it into pieces).  */
 581 extern int can_compare_p PROTO((enum machine_mode));
 582
 583 /* Emit a library call comparison between floating point X and Y.
 584    COMPARISON is the rtl operator to compare with (EQ, NE, GT, etc.).  */
 585 extern void emit_float_lib_cmp PROTO((rtx, rtx, enum rtx_code));
 586
 587 /* Generate code to indirectly jump to a location given in the rtx LOC.  */
 588 extern void emit_indirect_jump PROTO((rtx));
 589
 590 #ifdef HAVE_conditional_move
 591 /* Emit a conditional move operation.  */
 592 rtx emit_conditional_move PROTO((rtx, enum rtx_code, rtx, rtx,
 593                                  enum machine_mode, rtx, rtx,
 594                                  enum machine_mode, int));
 595
 596 /* Return non-zero if the conditional move is supported.  */
 597 int can_conditionally_move_p PROTO((enum machine_mode mode));
 598 #endif
 599
 600 /* Create but don't emit one rtl instruction to add one rtx into another.
 601    Modes must match; operands must meet the operation's predicates.
 602    Likewise for subtraction and for just copying.
 603    These do not call protect_from_queue; caller must do so.  */
 604 extern rtx gen_add2_insn PROTO((rtx, rtx));
 605 extern rtx gen_sub2_insn PROTO((rtx, rtx));
 606 extern rtx gen_move_insn PROTO((rtx, rtx));
 607 extern int have_add2_insn PROTO((enum machine_mode));
 608 extern int have_sub2_insn PROTO((enum machine_mode));
 609
 610 /* Return the INSN_CODE to use for an extend operation.  */
 611 extern enum insn_code can_extend_p PROTO((enum machine_mode,
 612                                           enum machine_mode, int));
 613
 614 /* Generate the body of an insn to extend Y (with mode MFROM)
 615    into X (with mode MTO).  Do zero-extension if UNSIGNEDP is nonzero.  */
 616 extern rtx gen_extend_insn PROTO((rtx, rtx, enum machine_mode,
 617                                   enum machine_mode, int));
 618
 619 /* Initialize the tables that control conversion between fixed and
 620    floating values.  */
 621 extern void init_fixtab PROTO((void));
 622 extern void init_floattab PROTO((void));
 623
 624 /* Generate code for a FLOAT_EXPR.  */
 625 extern void expand_float PROTO((rtx, rtx, int));
 626
 627 /* Generate code for a FIX_EXPR.  */
 628 extern void expand_fix PROTO((rtx, rtx, int));
 629
 630 /* Call this once to initialize the contents of the optabs
 631    appropriately for the current target machine.  */
 632 extern void init_optabs PROTO((void));
 633 \f
 634 /* Functions from expmed.c:  */
 635
 636 /* Arguments MODE, RTX: return an rtx for the negation of that value.
 637    May emit insns.  */
 638 extern rtx negate_rtx PROTO((enum machine_mode, rtx));
 639
 640 /* Expand a logical AND operation.  */
 641 extern rtx expand_and PROTO((rtx, rtx, rtx));
 642
 643 /* Emit a store-flag operation.  */
 644 extern rtx emit_store_flag PROTO((rtx, enum rtx_code, rtx, rtx,
 645                                   enum machine_mode, int, int));
 646
 647 /* Like emit_store_flag, but always succeeds.  */
 648 extern rtx emit_store_flag_force PROTO((rtx, enum rtx_code, rtx, rtx,
 649                                         enum machine_mode, int, int));
 650
 651 /* Functions from loop.c:  */
 652
 653 /* Given a JUMP_INSN, return a description of the test being made.  */
 654 extern rtx get_condition PROTO((rtx, rtx *));
 655 \f
 656 /* Functions from expr.c:  */
 657
 658 /* This is run once per compilation to set up which modes can be used
 659    directly in memory and to initialize the block move optab.  */
 660 extern void init_expr_once PROTO((void));
 661
 662 /* This is run at the start of compiling a function.  */
 663 extern void init_expr PROTO((void));
 664
 665 /* Use protect_from_queue to convert a QUEUED expression
 666    into something that you can put immediately into an instruction.  */
 667 extern rtx protect_from_queue PROTO((rtx, int));
 668
 669 /* Perform all the pending incrementations.  */
 670 extern void emit_queue PROTO((void));
 671
 672 /* Emit some rtl insns to move data between rtx's, converting machine modes.
 673    Both modes must be floating or both fixed.  */
 674 extern void convert_move PROTO((rtx, rtx, int));
 675
 676 /* Convert an rtx to specified machine mode and return the result.  */
 677 extern rtx convert_to_mode PROTO((enum machine_mode, rtx, int));
 678
 679 /* Convert an rtx to MODE from OLDMODE and return the result.  */
 680 extern rtx convert_modes PROTO((enum machine_mode, enum machine_mode, rtx, int));
 681
 682 /* Emit code to move a block Y to a block X.  */
 683 extern rtx emit_block_move PROTO((rtx, rtx, rtx, int));
 684
 685 /* Copy all or part of a value X into registers starting at REGNO.
 686    The number of registers to be filled is NREGS.  */
 687 extern void move_block_to_reg PROTO((int, rtx, int, enum machine_mode));
 688
 689 /* Copy all or part of a BLKmode value X out of registers starting at REGNO.
 690    The number of registers to be filled is NREGS.  */
 691 extern void move_block_from_reg PROTO((int, rtx, int, int));
 692
 693 /* Load a BLKmode value into non-consecutive registers represented by a
 694    PARALLEL.  */
 695 extern void emit_group_load PROTO((rtx, rtx));
 696 /* Store a BLKmode value from non-consecutive registers represented by a
 697    PARALLEL.  */
 698 extern void emit_group_store PROTO((rtx, rtx));
 699
 700 /* Mark REG as holding a parameter for the next CALL_INSN.  */
 701 extern void use_reg PROTO((rtx *, rtx));
 702 /* Mark NREGS consecutive regs, starting at REGNO, as holding parameters
 703    for the next CALL_INSN.  */
 704 extern void use_regs PROTO((rtx *, int, int));
 705 /* Mark a PARALLEL as holding a parameter for the next CALL_INSN.  */
 706 extern void use_group_regs PROTO((rtx *, rtx));
 707
 708 /* Write zeros through the storage of OBJECT.
 709    If OBJECT has BLKmode, SIZE is its length in bytes and ALIGN is its
 710    alignment.  */
 711 extern rtx clear_storage PROTO((rtx, rtx, int));
 712
 713 /* Emit insns to set X from Y.  */
 714 extern rtx emit_move_insn PROTO((rtx, rtx));
 715
 716 /* Emit insns to set X from Y, with no frills.  */
 717 extern rtx emit_move_insn_1 PROTO ((rtx, rtx));
 718
 719 /* Push a block of length SIZE (perhaps variable)
 720    and return an rtx to address the beginning of the block.  */
 721 extern rtx push_block PROTO((rtx, int, int));
 722
 723 /* Make an operand to push something on the stack.  */
 724 extern rtx gen_push_operand PROTO((void));
 725
 726 #ifdef TREE_CODE
 727 /* Generate code to push something onto the stack, given its mode and type.  */
 728 extern void emit_push_insn PROTO((rtx, enum machine_mode, tree, rtx, int,
 729                                   int, rtx, int, rtx, rtx));
 730
 731 /* Emit library call.  */
 732 extern void emit_library_call PVPROTO((rtx orgfun, int no_queue,
 733   enum machine_mode outmode, int nargs, ...));
 734 extern rtx emit_library_call_value PVPROTO((rtx orgfun, rtx value, int no_queue,
 735   enum machine_mode outmode, int nargs, ...));
 736
 737 /* Expand an assignment that stores the value of FROM into TO. */
 738 extern rtx expand_assignment PROTO((tree, tree, int, int));
 739
 740 /* Generate code for computing expression EXP,
 741    and storing the value into TARGET.
 742    If SUGGEST_REG is nonzero, copy the value through a register
 743    and return that register, if that is possible.  */
 744 extern rtx store_expr PROTO((tree, rtx, int));
 745 #endif
 746
 747 /* Given an rtx that may include add and multiply operations,
 748    generate them as insns and return a pseudo-reg containing the value.
 749    Useful after calling expand_expr with 1 as sum_ok.  */
 750 extern rtx force_operand PROTO((rtx, rtx));
 751
 752 extern rtx expand_builtin_setjmp PROTO((rtx, rtx));
 753
 754 #ifdef TREE_CODE
 755 /* Generate code for computing expression EXP.
 756    An rtx for the computed value is returned.  The value is never null.
 757    In the case of a void EXP, const0_rtx is returned.  */
 758 extern rtx expand_expr PROTO((tree, rtx, enum machine_mode,
 759                               enum expand_modifier));
 760 #endif
 761
 762 /* At the start of a function, record that we have no previously-pushed
 763    arguments waiting to be popped.  */
 764 extern void init_pending_stack_adjust PROTO((void));
 765
 766 /* When exiting from function, if safe, clear out any pending stack adjust
 767    so the adjustment won't get done.  */
 768 extern void clear_pending_stack_adjust PROTO((void));
 769
 770 /* Pop any previously-pushed arguments that have not been popped yet.  */
 771 extern void do_pending_stack_adjust PROTO((void));
 772
 773 #ifdef TREE_CODE
 774 /* Generate code to evaluate EXP and jump to LABEL if the value is zero.  */
 775 extern void jumpifnot PROTO((tree, rtx));
 776
 777 /* Generate code to evaluate EXP and jump to LABEL if the value is nonzero.  */
 778 extern void jumpif PROTO((tree, rtx));
 779
 780 /* Generate code to evaluate EXP and jump to IF_FALSE_LABEL if
 781    the result is zero, or IF_TRUE_LABEL if the result is one.  */
 782 extern void do_jump PROTO((tree, rtx, rtx));
 783 #endif
 784
 785 /* Generate rtl to compare two rtx's, will call emit_cmp_insn.  */
 786 extern rtx compare_from_rtx PROTO((rtx, rtx, enum rtx_code, int,
 787                                    enum machine_mode, rtx, int));
 788
 789 /* Generate a tablejump instruction (used for switch statements).  */
 790 extern void do_tablejump PROTO((rtx, enum machine_mode, rtx, rtx, rtx));
 791 \f
 792 #ifdef TREE_CODE
 793 /* rtl.h and tree.h were included.  */
 794 /* Return an rtx for the size in bytes of the value of an expr.  */
 795 extern rtx expr_size PROTO((tree));
 796
 797 extern rtx lookup_static_chain PROTO((tree));
 798
 799 /* Convert a stack slot address ADDR valid in function FNDECL
 800    into an address valid in this function (using a static chain).  */
 801 extern rtx fix_lexical_addr PROTO((rtx, tree));
 802
 803 /* Return the address of the trampoline for entering nested fn FUNCTION.  */
 804 extern rtx trampoline_address PROTO((tree));
 805
 806 /* Return an rtx that refers to the value returned by a function
 807    in its original home.  This becomes invalid if any more code is emitted.  */
 808 extern rtx hard_function_value PROTO((tree, tree));
 809
 810 extern rtx prepare_call_address PROTO((rtx, tree, rtx *, int));
 811
 812 extern rtx expand_call PROTO((tree, rtx, int));
 813
 814 extern rtx expand_shift PROTO((enum tree_code, enum machine_mode, rtx, tree, rtx, int));
 815 extern rtx expand_divmod PROTO((int, enum tree_code, enum machine_mode, rtx, rtx, rtx, int));
 816 extern void locate_and_pad_parm PROTO((enum machine_mode, tree, int, tree, struct args_size *, struct args_size *, struct args_size *));
 817 extern rtx expand_inline_function PROTO((tree, tree, rtx, int, tree, rtx));
 818 /* Return the CODE_LABEL rtx for a LABEL_DECL, creating it if necessary.  */
 819 extern rtx label_rtx PROTO((tree));
 820 #endif
 821
 822 /* Indicate how an input argument register was promoted.  */
 823 extern rtx promoted_input_arg PROTO((int, enum machine_mode *, int *));
 824
 825 /* Return an rtx like arg but sans any constant terms.
 826    Returns the original rtx if it has no constant terms.
 827    The constant terms are added and stored via a second arg.  */
 828 extern rtx eliminate_constant_term PROTO((rtx, rtx *));
 829
 830 /* Convert arg to a valid memory address for specified machine mode,
 831    by emitting insns to perform arithmetic if nec.  */
 832 extern rtx memory_address PROTO((enum machine_mode, rtx));
 833
 834 /* Like `memory_address' but pretent `flag_force_addr' is 0.  */
 835 extern rtx memory_address_noforce PROTO((enum machine_mode, rtx));
 836
 837 /* Return a memory reference like MEMREF, but with its mode changed
 838    to MODE and its address changed to ADDR.
 839    (VOIDmode means don't change the mode.
 840    NULL for ADDR means don't change the address.)  */
 841 extern rtx change_address PROTO((rtx, enum machine_mode, rtx));
 842
 843 /* Return a memory reference like MEMREF, but which is known to have a
 844    valid address.  */
 845
 846 extern rtx validize_mem PROTO((rtx));
 847
 848 /* Assemble the static constant template for function entry trampolines.  */
 849 extern rtx assemble_trampoline_template PROTO((void));
 850
 851 /* Return 1 if two rtx's are equivalent in structure and elements.  */
 852 extern int rtx_equal_p PROTO((rtx, rtx));
 853
 854 /* Given rtx, return new rtx whose address won't be affected by
 855    any side effects.  It has been copied to a new temporary reg.  */
 856 extern rtx stabilize PROTO((rtx));
 857
 858 /* Given an rtx, copy all regs it refers to into new temps
 859    and return a modified copy that refers to the new temps.  */
 860 extern rtx copy_all_regs PROTO((rtx));
 861
 862 /* Copy given rtx to a new temp reg and return that.  */
 863 extern rtx copy_to_reg PROTO((rtx));
 864
 865 /* Like copy_to_reg but always make the reg Pmode.  */
 866 extern rtx copy_addr_to_reg PROTO((rtx));
 867
 868 /* Like copy_to_reg but always make the reg the specified mode MODE.  */
 869 extern rtx copy_to_mode_reg PROTO((enum machine_mode, rtx));
 870
 871 /* Copy given rtx to given temp reg and return that.  */
 872 extern rtx copy_to_suggested_reg PROTO((rtx, rtx, enum machine_mode));
 873
 874 /* Copy a value to a register if it isn't already a register.
 875    Args are mode (in case value is a constant) and the value.  */
 876 extern rtx force_reg PROTO((enum machine_mode, rtx));
 877
 878 /* Return given rtx, copied into a new temp reg if it was in memory.  */
 879 extern rtx force_not_mem PROTO((rtx));
 880
 881 #ifdef TREE_CODE
 882 /* Return mode and signedness to use when object is promoted.  */
 883 extern enum machine_mode promote_mode PROTO((tree, enum machine_mode,
 884                                              int *, int));
 885 #endif
 886
 887 /* Remove some bytes from the stack.  An rtx says how many.  */
 888 extern void adjust_stack PROTO((rtx));
 889
 890 /* Add some bytes to the stack.  An rtx says how many.  */
 891 extern void anti_adjust_stack PROTO((rtx));
 892
 893 /* This enum is used for the following two functions.  */
 894 enum save_level {SAVE_BLOCK, SAVE_FUNCTION, SAVE_NONLOCAL};
 895
 896 /* Save the stack pointer at the specified level.  */
 897 extern void emit_stack_save PROTO((enum save_level, rtx *, rtx));
 898
 899 /* Restore the stack pointer from a save area of the specified level.  */
 900 extern void emit_stack_restore PROTO((enum save_level, rtx, rtx));
 901
 902 /* Allocate some space on the stack dynamically and return its address.  An rtx
 903    says how many bytes.  */
 904 extern rtx allocate_dynamic_stack_space PROTO((rtx, rtx, int));
 905
 906 /* Probe a range of stack addresses from FIRST to FIRST+SIZE, inclusive.
 907    FIRST is a constant and size is a Pmode RTX.  These are offsets from the
 908    current stack pointer.  STACK_GROWS_DOWNWARD says whether to add or
 909    subtract from the stack.  If SIZE is constant, this is done
 910    with a fixed number of probes.  Otherwise, we must make a loop.  */
 911 extern void probe_stack_range PROTO((HOST_WIDE_INT, rtx));
 912
 913 /* Return an rtx that refers to the value returned by a library call
 914    in its original home.  This becomes invalid if any more code is emitted.  */
 915 extern rtx hard_libcall_value PROTO((enum machine_mode));
 916
 917 /* Given an rtx, return an rtx for a value rounded up to a multiple
 918    of STACK_BOUNDARY / BITS_PER_UNIT.  */
 919 extern rtx round_push PROTO((rtx));
 920
 921 extern rtx store_bit_field PROTO((rtx, int, int, enum machine_mode, rtx, int, int));
 922 extern rtx extract_bit_field PROTO((rtx, int, int, int, rtx, enum machine_mode, enum machine_mode, int, int));
 923 extern rtx expand_mult PROTO((enum machine_mode, rtx, rtx, rtx, int));
 924 extern rtx expand_mult_add PROTO((rtx, rtx, rtx, rtx,enum machine_mode, int));
 925 extern rtx expand_mult_highpart_adjust PROTO((enum machine_mode, rtx, rtx, rtx, rtx, int));
 926
 927 extern rtx assemble_static_space PROTO((int));
 928
 929 /* Hook called by expand_expr for language-specific tree codes.
 930    It is up to the language front end to install a hook
 931    if it has any such codes that expand_expr needs to know about.  */
 932 extern rtx (*lang_expand_expr) ();
 933
 934 #ifdef TREE_CODE
 935 /* Build bytecode call descriptor for function SUBR. */
 936 extern rtx bc_build_calldesc PROTO((tree));
 937
 938 /* Emit a type code to be used by the runtime support in handling
 939    parameter passing.   The type code consists of the machine mode
 940    plus the minimal alignment shifted left 8 bits.  */
 941 extern tree bc_runtime_type_code PROTO((tree));
 942 #endif