gcc/expr.h

   1 /* Definitions for code generation pass of GNU compiler.
   2    Copyright (C) 1987, 91, 92, 93, 94, 1995 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
  22 #ifndef __STDC__
  23 #ifndef const
  24 #define const
  25 #endif
  26 #endif
  27
  28 /* The default branch cost is 1.  */
  29 #ifndef BRANCH_COST
  30 #define BRANCH_COST 1
  31 #endif
  32
  33 /* Macros to access the slots of a QUEUED rtx.
  34    Here rather than in rtl.h because only the expansion pass
  35    should ever encounter a QUEUED.  */
  36
  37 /* The variable for which an increment is queued.  */
  38 #define QUEUED_VAR(P) XEXP (P, 0)
  39 /* If the increment has been emitted, this is the insn
  40    that does the increment.  It is zero before the increment is emitted.  */
  41 #define QUEUED_INSN(P) XEXP (P, 1)
  42 /* If a pre-increment copy has been generated, this is the copy
  43    (it is a temporary reg).  Zero if no copy made yet.  */
  44 #define QUEUED_COPY(P) XEXP (P, 2)
  45 /* This is the body to use for the insn to do the increment.
  46    It is used to emit the increment.  */
  47 #define QUEUED_BODY(P) XEXP (P, 3)
  48 /* Next QUEUED in the queue.  */
  49 #define QUEUED_NEXT(P) XEXP (P, 4)
  50
  51 /* This is the 4th arg to `expand_expr'.
  52    EXPAND_SUM means it is ok to return a PLUS rtx or MULT rtx.
  53    EXPAND_INITIALIZER is similar but also record any labels on forced_labels.
  54    EXPAND_CONST_ADDRESS means it is ok to return a MEM whose address
  55     is a constant that is not a legitimate address.  */
  56 enum expand_modifier {EXPAND_NORMAL, EXPAND_SUM,
  57                       EXPAND_CONST_ADDRESS, EXPAND_INITIALIZER};
  58
  59 /* List of labels that must never be deleted.  */
  60 extern rtx forced_labels;
  61
  62 /* List (chain of EXPR_LISTs) of pseudo-regs of SAVE_EXPRs.
  63    So we can mark them all live at the end of the function, if stupid.  */
  64 extern rtx save_expr_regs;
  65
  66 extern int current_function_calls_alloca;
  67 extern int current_function_outgoing_args_size;
  68
  69 /* This is the offset from the arg pointer to the place where the first
  70    anonymous arg can be found, if there is one.  */
  71 extern rtx current_function_arg_offset_rtx;
  72
  73 /* This is nonzero if the current function uses the constant pool.  */
  74 extern int current_function_uses_const_pool;
  75
  76 /* This is nonzero if the current function uses pic_offset_table_rtx.  */
  77 extern int current_function_uses_pic_offset_table;
  78
  79 /* The arg pointer hard register, or the pseudo into which it was copied.  */
  80 extern rtx current_function_internal_arg_pointer;
  81
  82 /* Nonzero means stack pops must not be deferred, and deferred stack
  83    pops must not be output.  It is nonzero inside a function call,
  84    inside a conditional expression, inside a statement expression,
  85    and in other cases as well.  */
  86 extern int inhibit_defer_pop;
  87
  88 /* Number of function calls seen so far in current function.  */
  89
  90 extern int function_call_count;
  91
  92 /* RTX for stack slot that holds the current handler for nonlocal gotos.
  93    Zero when function does not have nonlocal labels.  */
  94
  95 extern rtx nonlocal_goto_handler_slot;
  96
  97 /* RTX for stack slot that holds the stack pointer value to restore
  98    for a nonlocal goto.
  99    Zero when function does not have nonlocal labels.  */
 100
 101 extern rtx nonlocal_goto_stack_level;
 102
 103 /* List (chain of TREE_LIST) of LABEL_DECLs for all nonlocal labels
 104    (labels to which there can be nonlocal gotos from nested functions)
 105    in this function.  */
 106
 107 #ifdef TREE_CODE   /* Don't lose if tree.h not included.  */
 108 extern tree nonlocal_labels;
 109 #endif
 110
 111 #define NO_DEFER_POP (inhibit_defer_pop += 1)
 112 #define OK_DEFER_POP (inhibit_defer_pop -= 1)
 113
 114 /* Number of units that we should eventually pop off the stack.
 115    These are the arguments to function calls that have already returned.  */
 116 extern int pending_stack_adjust;
 117
 118 /* A list of all cleanups which belong to the arguments of
 119    function calls being expanded by expand_call.  */
 120 #ifdef TREE_CODE   /* Don't lose if tree.h not included.  */
 121 extern tree cleanups_this_call;
 122 #endif
 123
 124 /* When temporaries are created by TARGET_EXPRs, they are created at
 125    this level of temp_slot_level, so that they can remain allocated
 126    until no longer needed.  CLEANUP_POINT_EXPRs define the lifetime
 127    of TARGET_EXPRs.  */
 128 extern int target_temp_slot_level;
 129 \f
 130 #ifdef TREE_CODE /* Don't lose if tree.h not included.  */
 131 /* Structure to record the size of a sequence of arguments
 132    as the sum of a tree-expression and a constant.  */
 133
 134 struct args_size
 135 {
 136   int constant;
 137   tree var;
 138 };
 139 #endif
 140
 141 /* Add the value of the tree INC to the `struct args_size' TO.  */
 142
 143 #define ADD_PARM_SIZE(TO, INC)  \
 144 { tree inc = (INC);                             \
 145   if (TREE_CODE (inc) == INTEGER_CST)           \
 146     (TO).constant += TREE_INT_CST_LOW (inc);    \
 147   else if ((TO).var == 0)                       \
 148     (TO).var = inc;                             \
 149   else                                          \
 150     (TO).var = size_binop (PLUS_EXPR, (TO).var, inc); }
 151
 152 #define SUB_PARM_SIZE(TO, DEC)  \
 153 { tree dec = (DEC);                             \
 154   if (TREE_CODE (dec) == INTEGER_CST)           \
 155     (TO).constant -= TREE_INT_CST_LOW (dec);    \
 156   else if ((TO).var == 0)                       \
 157     (TO).var = size_binop (MINUS_EXPR, integer_zero_node, dec); \
 158   else                                          \
 159     (TO).var = size_binop (MINUS_EXPR, (TO).var, dec); }
 160
 161 /* Convert the implicit sum in a `struct args_size' into an rtx.  */
 162 #define ARGS_SIZE_RTX(SIZE)                                             \
 163 ((SIZE).var == 0 ? GEN_INT ((SIZE).constant)    \
 164  : expand_expr (size_binop (PLUS_EXPR, (SIZE).var,                      \
 165                             size_int ((SIZE).constant)),                \
 166                 NULL_RTX, VOIDmode, 0))
 167
 168 /* Convert the implicit sum in a `struct args_size' into a tree.  */
 169 #define ARGS_SIZE_TREE(SIZE)                                            \
 170 ((SIZE).var == 0 ? size_int ((SIZE).constant)                           \
 171  : size_binop (PLUS_EXPR, (SIZE).var, size_int ((SIZE).constant)))
 172
 173 /* Supply a default definition for FUNCTION_ARG_PADDING:
 174    usually pad upward, but pad short args downward on
 175    big-endian machines.  */
 176
 177 enum direction {none, upward, downward};  /* Value has this type.  */
 178
 179 #ifndef FUNCTION_ARG_PADDING
 180 #define FUNCTION_ARG_PADDING(MODE, TYPE)                                \
 181   (! BYTES_BIG_ENDIAN                                                   \
 182    ? upward                                                             \
 183    : (((MODE) == BLKmode                                                \
 184        ? ((TYPE) && TREE_CODE (TYPE_SIZE (TYPE)) == INTEGER_CST         \
 185           && int_size_in_bytes (TYPE) < (PARM_BOUNDARY / BITS_PER_UNIT)) \
 186        : GET_MODE_BITSIZE (MODE) < PARM_BOUNDARY)                       \
 187       ? downward : upward))
 188 #endif
 189
 190 /* Supply a default definition for FUNCTION_ARG_BOUNDARY.  Normally, we let
 191    FUNCTION_ARG_PADDING, which also pads the length, handle any needed
 192    alignment.  */
 193
 194 #ifndef FUNCTION_ARG_BOUNDARY
 195 #define FUNCTION_ARG_BOUNDARY(MODE, TYPE)       PARM_BOUNDARY
 196 #endif
 197
 198 /* Nonzero if we do not know how to pass TYPE solely in registers.
 199    We cannot do so in the following cases:
 200
 201    - if the type has variable size
 202    - if the type is marked as addressable (it is required to be constructed
 203      into the stack)
 204    - if the padding and mode of the type is such that a copy into a register
 205      would put it into the wrong part of the register.
 206
 207    Which padding can't be supported depends on the byte endianness.
 208
 209    A value in a register is implicitly padded at the most significant end.
 210    On a big-endian machine, that is the lower end in memory.
 211    So a value padded in memory at the upper end can't go in a register.
 212    For a little-endian machine, the reverse is true.  */
 213
 214 #define MUST_PASS_IN_STACK(MODE,TYPE)                   \
 215   ((TYPE) != 0                                          \
 216    && (TREE_CODE (TYPE_SIZE (TYPE)) != INTEGER_CST      \
 217        || TREE_ADDRESSABLE (TYPE)                       \
 218        || ((MODE) == BLKmode                            \
 219            && ! ((TYPE) != 0 && TREE_CODE (TYPE_SIZE (TYPE)) == INTEGER_CST \
 220                  && 0 == (int_size_in_bytes (TYPE)      \
 221                           % (PARM_BOUNDARY / BITS_PER_UNIT))) \
 222            && (FUNCTION_ARG_PADDING (MODE, TYPE)        \
 223                == (BYTES_BIG_ENDIAN ? upward : downward)))))
 224
 225 /* Nonzero if type TYPE should be returned in memory.
 226    Most machines can use the following default definition.  */
 227
 228 #ifndef RETURN_IN_MEMORY
 229 #define RETURN_IN_MEMORY(TYPE) (TYPE_MODE (TYPE) == BLKmode)
 230 #endif
 231 \f
 232 /* Optabs are tables saying how to generate insn bodies
 233    for various machine modes and numbers of operands.
 234    Each optab applies to one operation.
 235    For example, add_optab applies to addition.
 236
 237    The insn_code slot is the enum insn_code that says how to
 238    generate an insn for this operation on a particular machine mode.
 239    It is CODE_FOR_nothing if there is no such insn on the target machine.
 240
 241    The `lib_call' slot is the name of the library function that
 242    can be used to perform the operation.
 243
 244    A few optabs, such as move_optab and cmp_optab, are used
 245    by special code.  */
 246
 247 /* Everything that uses expr.h needs to define enum insn_code
 248    but we don't list it in the Makefile dependencies just for that.  */
 249 #include "insn-codes.h"
 250
 251 typedef struct optab
 252 {
 253   enum rtx_code code;
 254   struct {
 255     enum insn_code insn_code;
 256     rtx libfunc;
 257   } handlers [NUM_MACHINE_MODES];
 258 } * optab;
 259
 260 /* Given an enum insn_code, access the function to construct
 261    the body of that kind of insn.  */
 262 #ifdef FUNCTION_CONVERSION_BUG
 263 /* Some compilers fail to convert a function properly to a
 264    pointer-to-function when used as an argument.
 265    So produce the pointer-to-function directly.
 266    Luckily, these compilers seem to work properly when you
 267    call the pointer-to-function.  */
 268 #define GEN_FCN(CODE) (insn_gen_function[(int) (CODE)])
 269 #else
 270 #define GEN_FCN(CODE) (*insn_gen_function[(int) (CODE)])
 271 #endif
 272
 273 extern rtx (*const insn_gen_function[]) ();
 274
 275 extern optab add_optab;
 276 extern optab sub_optab;
 277 extern optab smul_optab;        /* Signed and floating-point multiply */
 278 extern optab smul_highpart_optab; /* Signed multiply, return high word */
 279 extern optab umul_highpart_optab;
 280 extern optab smul_widen_optab;  /* Signed multiply with result
 281                                    one machine mode wider than args */
 282 extern optab umul_widen_optab;
 283 extern optab sdiv_optab;        /* Signed divide */
 284 extern optab sdivmod_optab;     /* Signed divide-and-remainder in one */
 285 extern optab udiv_optab;
 286 extern optab udivmod_optab;
 287 extern optab smod_optab;        /* Signed remainder */
 288 extern optab umod_optab;
 289 extern optab flodiv_optab;      /* Optab for floating divide. */
 290 extern optab ftrunc_optab;      /* Convert float to integer in float fmt */
 291 extern optab and_optab;         /* Logical and */
 292 extern optab ior_optab;         /* Logical or */
 293 extern optab xor_optab;         /* Logical xor */
 294 extern optab ashl_optab;        /* Arithmetic shift left */
 295 extern optab ashr_optab;        /* Arithmetic shift right */
 296 extern optab lshr_optab;        /* Logical shift right */
 297 extern optab rotl_optab;        /* Rotate left */
 298 extern optab rotr_optab;        /* Rotate right */
 299 extern optab smin_optab;        /* Signed and floating-point minimum value */
 300 extern optab smax_optab;        /* Signed and floating-point maximum value */
 301 extern optab umin_optab;        /* Unsigned minimum value */
 302 extern optab umax_optab;        /* Unsigned maximum value */
 303
 304 extern optab mov_optab;         /* Move instruction.  */
 305 extern optab movstrict_optab;   /* Move, preserving high part of register.  */
 306
 307 extern optab cmp_optab;         /* Compare insn; two operands.  */
 308 extern optab tst_optab;         /* tst insn; compare one operand against 0 */
 309
 310 /* Unary operations */
 311 extern optab neg_optab;         /* Negation */
 312 extern optab abs_optab;         /* Abs value */
 313 extern optab one_cmpl_optab;    /* Bitwise not */
 314 extern optab ffs_optab;         /* Find first bit set */
 315 extern optab sqrt_optab;        /* Square root */
 316 extern optab sin_optab;         /* Sine */
 317 extern optab cos_optab;         /* Cosine */
 318 extern optab strlen_optab;      /* String length */
 319
 320 /* Tables of patterns for extending one integer mode to another.  */
 321 extern enum insn_code extendtab[MAX_MACHINE_MODE][MAX_MACHINE_MODE][2];
 322
 323 /* Tables of patterns for converting between fixed and floating point. */
 324 extern enum insn_code fixtab[NUM_MACHINE_MODES][NUM_MACHINE_MODES][2];
 325 extern enum insn_code fixtrunctab[NUM_MACHINE_MODES][NUM_MACHINE_MODES][2];
 326 extern enum insn_code floattab[NUM_MACHINE_MODES][NUM_MACHINE_MODES][2];
 327
 328 /* Contains the optab used for each rtx code.  */
 329 extern optab code_to_optab[NUM_RTX_CODE + 1];
 330
 331 /* Passed to expand_binop and expand_unop to say which options to try to use
 332    if the requested operation can't be open-coded on the requisite mode.
 333    Either OPTAB_LIB or OPTAB_LIB_WIDEN says try using a library call.
 334    Either OPTAB_WIDEN or OPTAB_LIB_WIDEN says try using a wider mode.
 335    OPTAB_MUST_WIDEN says try widening and don't try anything else.  */
 336
 337 enum optab_methods
 338 {
 339   OPTAB_DIRECT,
 340   OPTAB_LIB,
 341   OPTAB_WIDEN,
 342   OPTAB_LIB_WIDEN,
 343   OPTAB_MUST_WIDEN
 344 };
 345
 346 /* SYMBOL_REF rtx's for the library functions that are called
 347    implicitly and not via optabs.  */
 348
 349 extern rtx extendsfdf2_libfunc;
 350 extern rtx extendsfxf2_libfunc;
 351 extern rtx extendsftf2_libfunc;
 352 extern rtx extenddfxf2_libfunc;
 353 extern rtx extenddftf2_libfunc;
 354
 355 extern rtx truncdfsf2_libfunc;
 356 extern rtx truncxfsf2_libfunc;
 357 extern rtx trunctfsf2_libfunc;
 358 extern rtx truncxfdf2_libfunc;
 359 extern rtx trunctfdf2_libfunc;
 360
 361 extern rtx memcpy_libfunc;
 362 extern rtx bcopy_libfunc;
 363 extern rtx memcmp_libfunc;
 364 extern rtx bcmp_libfunc;
 365 extern rtx memset_libfunc;
 366 extern rtx bzero_libfunc;
 367
 368 extern rtx eqhf2_libfunc;
 369 extern rtx nehf2_libfunc;
 370 extern rtx gthf2_libfunc;
 371 extern rtx gehf2_libfunc;
 372 extern rtx lthf2_libfunc;
 373 extern rtx lehf2_libfunc;
 374
 375 extern rtx eqsf2_libfunc;
 376 extern rtx nesf2_libfunc;
 377 extern rtx gtsf2_libfunc;
 378 extern rtx gesf2_libfunc;
 379 extern rtx ltsf2_libfunc;
 380 extern rtx lesf2_libfunc;
 381
 382 extern rtx eqdf2_libfunc;
 383 extern rtx nedf2_libfunc;
 384 extern rtx gtdf2_libfunc;
 385 extern rtx gedf2_libfunc;
 386 extern rtx ltdf2_libfunc;
 387 extern rtx ledf2_libfunc;
 388
 389 extern rtx eqxf2_libfunc;
 390 extern rtx nexf2_libfunc;
 391 extern rtx gtxf2_libfunc;
 392 extern rtx gexf2_libfunc;
 393 extern rtx ltxf2_libfunc;
 394 extern rtx lexf2_libfunc;
 395
 396 extern rtx eqtf2_libfunc;
 397 extern rtx netf2_libfunc;
 398 extern rtx gttf2_libfunc;
 399 extern rtx getf2_libfunc;
 400 extern rtx lttf2_libfunc;
 401 extern rtx letf2_libfunc;
 402
 403 extern rtx floatsisf_libfunc;
 404 extern rtx floatdisf_libfunc;
 405 extern rtx floattisf_libfunc;
 406
 407 extern rtx floatsidf_libfunc;
 408 extern rtx floatdidf_libfunc;
 409 extern rtx floattidf_libfunc;
 410
 411 extern rtx floatsixf_libfunc;
 412 extern rtx floatdixf_libfunc;
 413 extern rtx floattixf_libfunc;
 414
 415 extern rtx floatsitf_libfunc;
 416 extern rtx floatditf_libfunc;
 417 extern rtx floattitf_libfunc;
 418
 419 extern rtx fixsfsi_libfunc;
 420 extern rtx fixsfdi_libfunc;
 421 extern rtx fixsfti_libfunc;
 422
 423 extern rtx fixdfsi_libfunc;
 424 extern rtx fixdfdi_libfunc;
 425 extern rtx fixdfti_libfunc;
 426
 427 extern rtx fixxfsi_libfunc;
 428 extern rtx fixxfdi_libfunc;
 429 extern rtx fixxfti_libfunc;
 430
 431 extern rtx fixtfsi_libfunc;
 432 extern rtx fixtfdi_libfunc;
 433 extern rtx fixtfti_libfunc;
 434
 435 extern rtx fixunssfsi_libfunc;
 436 extern rtx fixunssfdi_libfunc;
 437 extern rtx fixunssfti_libfunc;
 438
 439 extern rtx fixunsdfsi_libfunc;
 440 extern rtx fixunsdfdi_libfunc;
 441 extern rtx fixunsdfti_libfunc;
 442
 443 extern rtx fixunsxfsi_libfunc;
 444 extern rtx fixunsxfdi_libfunc;
 445 extern rtx fixunsxfti_libfunc;
 446
 447 extern rtx fixunstfsi_libfunc;
 448 extern rtx fixunstfdi_libfunc;
 449 extern rtx fixunstfti_libfunc;
 450 \f
 451 typedef rtx (*rtxfun) ();
 452
 453 /* Indexed by the rtx-code for a conditional (eg. EQ, LT,...)
 454    gives the gen_function to make a branch to test that condition.  */
 455
 456 extern rtxfun bcc_gen_fctn[NUM_RTX_CODE];
 457
 458 /* Indexed by the rtx-code for a conditional (eg. EQ, LT,...)
 459    gives the insn code to make a store-condition insn
 460    to test that condition.  */
 461
 462 extern enum insn_code setcc_gen_code[NUM_RTX_CODE];
 463
 464 #ifdef HAVE_conditional_move
 465 /* Indexed by the the machine mode, gives the insn code to make a conditional
 466    move insn.  */
 467
 468 extern enum insn_code movcc_gen_code[NUM_MACHINE_MODES];
 469 #endif
 470
 471 /* This array records the insn_code of insns to perform block moves.  */
 472 extern enum insn_code movstr_optab[NUM_MACHINE_MODES];
 473
 474 /* This array records the insn_code of insns to perform block clears.  */
 475 extern enum insn_code clrstr_optab[NUM_MACHINE_MODES];
 476
 477 /* Define functions given in optabs.c.  */
 478
 479 /* Expand a binary operation given optab and rtx operands.  */
 480 extern rtx expand_binop PROTO((enum machine_mode, optab, rtx, rtx, rtx,
 481                                int, enum optab_methods));
 482
 483 /* Expand a binary operation with both signed and unsigned forms.  */
 484 extern rtx sign_expand_binop PROTO((enum machine_mode, optab, optab, rtx,
 485                                     rtx, rtx, int, enum optab_methods));
 486
 487 /* Generate code to perform an operation on two operands with two results.  */
 488 extern int expand_twoval_binop PROTO((optab, rtx, rtx, rtx, rtx, int));
 489
 490 /* Expand a unary arithmetic operation given optab rtx operand.  */
 491 extern rtx expand_unop PROTO((enum machine_mode, optab, rtx, rtx, int));
 492
 493 /* Expand the absolute value operation.  */
 494 extern rtx expand_abs PROTO((enum machine_mode, rtx, rtx, int, int));
 495
 496 /* Expand the complex absolute value operation.  */
 497 extern rtx expand_complex_abs PROTO((enum machine_mode, rtx, rtx, int));
 498
 499 /* Generate an instruction with a given INSN_CODE with an output and
 500    an input.  */
 501 extern void emit_unop_insn PROTO((int, rtx, rtx, enum rtx_code));
 502
 503 /* Emit code to perform a series of operations on a multi-word quantity, one
 504    word at a time.  */
 505 extern rtx emit_no_conflict_block PROTO((rtx, rtx, rtx, rtx, rtx));
 506
 507 /* Emit code to make a call to a constant function or a library call. */
 508 extern void emit_libcall_block PROTO((rtx, rtx, rtx, rtx));
 509
 510 /* Emit one rtl instruction to store zero in specified rtx.  */
 511 extern void emit_clr_insn PROTO((rtx));
 512
 513 /* Emit one rtl insn to store 1 in specified rtx assuming it contains 0.  */
 514 extern void emit_0_to_1_insn PROTO((rtx));
 515
 516 /* Emit one rtl insn to compare two rtx's.  */
 517 extern void emit_cmp_insn PROTO((rtx, rtx, enum rtx_code, rtx,
 518                                  enum machine_mode, int, int));
 519
 520 /* Nonzero if a compare of mode MODE can be done straightforwardly
 521    (without splitting it into pieces).  */
 522 extern int can_compare_p PROTO((enum machine_mode));
 523
 524 /* Emit a library call comparison between floating point X and Y.
 525    COMPARISON is the rtl operator to compare with (EQ, NE, GT, etc.).  */
 526 extern void emit_float_lib_cmp PROTO((rtx, rtx, enum rtx_code));
 527
 528 /* Generate code to indirectly jump to a location given in the rtx LOC.  */
 529 extern void emit_indirect_jump PROTO((rtx));
 530
 531 #ifdef HAVE_conditional_move
 532 /* Emit a conditional move operation.  */
 533 rtx emit_conditional_move PROTO((rtx, enum rtx_code, rtx, rtx,
 534                                  enum machine_mode, rtx, rtx,
 535                                  enum machine_mode, int));
 536
 537 /* Return non-zero if the conditional move is supported.  */
 538 int can_conditionally_move_p PROTO((enum machine_mode mode));
 539 #endif
 540
 541 /* Create but don't emit one rtl instruction to add one rtx into another.
 542    Modes must match; operands must meet the operation's predicates.
 543    Likewise for subtraction and for just copying.
 544    These do not call protect_from_queue; caller must do so.  */
 545 extern rtx gen_add2_insn PROTO((rtx, rtx));
 546 extern rtx gen_sub2_insn PROTO((rtx, rtx));
 547 extern rtx gen_move_insn PROTO((rtx, rtx));
 548 extern int have_add2_insn PROTO((enum machine_mode));
 549 extern int have_sub2_insn PROTO((enum machine_mode));
 550
 551 /* Return the INSN_CODE to use for an extend operation.  */
 552 extern enum insn_code can_extend_p PROTO((enum machine_mode,
 553                                           enum machine_mode, int));
 554
 555 /* Generate the body of an insn to extend Y (with mode MFROM)
 556    into X (with mode MTO).  Do zero-extension if UNSIGNEDP is nonzero.  */
 557 extern rtx gen_extend_insn PROTO((rtx, rtx, enum machine_mode,
 558                                   enum machine_mode, int));
 559
 560 /* Initialize the tables that control conversion between fixed and
 561    floating values.  */
 562 extern void init_fixtab PROTO((void));
 563 extern void init_floattab PROTO((void));
 564
 565 /* Generate code for a FLOAT_EXPR.  */
 566 extern void expand_float PROTO((rtx, rtx, int));
 567
 568 /* Generate code for a FIX_EXPR.  */
 569 extern void expand_fix PROTO((rtx, rtx, int));
 570
 571 /* Call this once to initialize the contents of the optabs
 572    appropriately for the current target machine.  */
 573 extern void init_optabs PROTO((void));
 574 \f
 575 /* Functions from expmed.c:  */
 576
 577 /* Arguments MODE, RTX: return an rtx for the negation of that value.
 578    May emit insns.  */
 579 extern rtx negate_rtx PROTO((enum machine_mode, rtx));
 580
 581 /* Expand a logical AND operation.  */
 582 extern rtx expand_and PROTO((rtx, rtx, rtx));
 583
 584 /* Emit a store-flag operation.  */
 585 extern rtx emit_store_flag PROTO((rtx, enum rtx_code, rtx, rtx,
 586                                   enum machine_mode, int, int));
 587
 588 /* Functions from loop.c:  */
 589
 590 /* Given a JUMP_INSN, return a description of the test being made.  */
 591 extern rtx get_condition PROTO((rtx, rtx *));
 592 \f
 593 /* Functions from expr.c:  */
 594
 595 /* This is run once per compilation to set up which modes can be used
 596    directly in memory and to initialize the block move optab.  */
 597 extern void init_expr_once PROTO((void));
 598
 599 /* This is run at the start of compiling a function.  */
 600 extern void init_expr PROTO((void));
 601
 602 /* Use protect_from_queue to convert a QUEUED expression
 603    into something that you can put immediately into an instruction.  */
 604 extern rtx protect_from_queue PROTO((rtx, int));
 605
 606 /* Perform all the pending incrementations.  */
 607 extern void emit_queue PROTO((void));
 608
 609 /* Emit some rtl insns to move data between rtx's, converting machine modes.
 610    Both modes must be floating or both fixed.  */
 611 extern void convert_move PROTO((rtx, rtx, int));
 612
 613 /* Convert an rtx to specified machine mode and return the result.  */
 614 extern rtx convert_to_mode PROTO((enum machine_mode, rtx, int));
 615
 616 /* Convert an rtx to MODE from OLDMODE and return the result.  */
 617 extern rtx convert_modes PROTO((enum machine_mode, enum machine_mode, rtx, int));
 618
 619 /* Emit code to move a block Y to a block X.  */
 620 extern void emit_block_move PROTO((rtx, rtx, rtx, int));
 621
 622 /* Copy all or part of a value X into registers starting at REGNO.
 623    The number of registers to be filled is NREGS.  */
 624 extern void move_block_to_reg PROTO((int, rtx, int, enum machine_mode));
 625
 626 /* Copy all or part of a BLKmode value X out of registers starting at REGNO.
 627    The number of registers to be filled is NREGS.  */
 628 extern void move_block_from_reg PROTO((int, rtx, int, int));
 629
 630 /* Mark REG as holding a parameter for the next CALL_INSN.  */
 631 extern void use_reg PROTO((rtx*, rtx));
 632 /* Mark NREGS consecutive regs, starting at REGNO, as holding parameters
 633    for the next CALL_INSN.  */
 634 extern void use_regs PROTO((rtx*, int, int));
 635
 636 /* Write zeros through the storage of OBJECT.
 637    If OBJECT has BLKmode, SIZE is its length in bytes and ALIGN is its
 638    alignment.
 639 extern void clear_storage PROTO((rtx, rtx, int));
 640
 641 /* Emit insns to set X from Y.  */
 642 extern rtx emit_move_insn PROTO((rtx, rtx));
 643
 644 /* Emit insns to set X from Y, with no frills.  */
 645 extern rtx emit_move_insn_1 PROTO ((rtx, rtx));
 646
 647 /* Push a block of length SIZE (perhaps variable)
 648    and return an rtx to address the beginning of the block.  */
 649 extern rtx push_block PROTO((rtx, int, int));
 650
 651 /* Make an operand to push something on the stack.  */
 652 extern rtx gen_push_operand PROTO((void));
 653
 654 #ifdef TREE_CODE
 655 /* Generate code to push something onto the stack, given its mode and type.  */
 656 extern void emit_push_insn PROTO((rtx, enum machine_mode, tree, rtx, int,
 657                                   int, rtx, int, rtx, rtx));
 658
 659 /* Emit library call.  */
 660 extern void emit_library_call PVPROTO((rtx orgfun, int no_queue,
 661   enum machine_mode outmode, int nargs, ...));
 662 extern rtx emit_library_call_value PVPROTO((rtx orgfun, rtx value, int no_queue,
 663   enum machine_mode outmode, int nargs, ...));
 664
 665 /* Expand an assignment that stores the value of FROM into TO. */
 666 extern rtx expand_assignment PROTO((tree, tree, int, int));
 667
 668 /* Generate code for computing expression EXP,
 669    and storing the value into TARGET.
 670    If SUGGEST_REG is nonzero, copy the value through a register
 671    and return that register, if that is possible.  */
 672 extern rtx store_expr PROTO((tree, rtx, int));
 673 #endif
 674
 675 /* Given an rtx that may include add and multiply operations,
 676    generate them as insns and return a pseudo-reg containing the value.
 677    Useful after calling expand_expr with 1 as sum_ok.  */
 678 extern rtx force_operand PROTO((rtx, rtx));
 679
 680 #ifdef TREE_CODE
 681 /* Generate code for computing expression EXP.
 682    An rtx for the computed value is returned.  The value is never null.
 683    In the case of a void EXP, const0_rtx is returned.  */
 684 extern rtx expand_expr PROTO((tree, rtx, enum machine_mode,
 685                               enum expand_modifier));
 686 #endif
 687
 688 /* At the start of a function, record that we have no previously-pushed
 689    arguments waiting to be popped.  */
 690 extern void init_pending_stack_adjust PROTO((void));
 691
 692 /* When exiting from function, if safe, clear out any pending stack adjust
 693    so the adjustment won't get done.  */
 694 extern void clear_pending_stack_adjust PROTO((void));
 695
 696 /* Pop any previously-pushed arguments that have not been popped yet.  */
 697 extern void do_pending_stack_adjust PROTO((void));
 698
 699 #ifdef TREE_CODE
 700 /* Expand all cleanups up to OLD_CLEANUPS.  */
 701 extern void expand_cleanups_to PROTO((tree));
 702
 703 /* Generate code to evaluate EXP and jump to LABEL if the value is zero.  */
 704 extern void jumpifnot PROTO((tree, rtx));
 705
 706 /* Generate code to evaluate EXP and jump to LABEL if the value is nonzero.  */
 707 extern void jumpif PROTO((tree, rtx));
 708
 709 /* Generate code to evaluate EXP and jump to IF_FALSE_LABEL if
 710    the result is zero, or IF_TRUE_LABEL if the result is one.  */
 711 extern void do_jump PROTO((tree, rtx, rtx));
 712 #endif
 713
 714 /* Generate rtl to compare two rtx's, will call emit_cmp_insn.  */
 715 extern rtx compare_from_rtx PROTO((rtx, rtx, enum rtx_code, int,
 716                                    enum machine_mode, rtx, int));
 717
 718 /* Generate a tablejump instruction (used for switch statements).  */
 719 extern void do_tablejump PROTO((rtx, enum machine_mode, rtx, rtx, rtx));
 720 \f
 721 #ifdef TREE_CODE
 722 /* rtl.h and tree.h were included.  */
 723 /* Return an rtx for the size in bytes of the value of an expr.  */
 724 extern rtx expr_size PROTO((tree));
 725
 726 extern rtx lookup_static_chain PROTO((tree));
 727
 728 /* Convert a stack slot address ADDR valid in function FNDECL
 729    into an address valid in this function (using a static chain).  */
 730 extern rtx fix_lexical_addr PROTO((rtx, tree));
 731
 732 /* Return the address of the trampoline for entering nested fn FUNCTION.  */
 733 extern rtx trampoline_address PROTO((tree));
 734
 735 /* Return an rtx that refers to the value returned by a function
 736    in its original home.  This becomes invalid if any more code is emitted.  */
 737 extern rtx hard_function_value PROTO((tree, tree));
 738
 739 extern rtx prepare_call_address PROTO((rtx, tree, rtx *, int));
 740
 741 extern rtx expand_call PROTO((tree, rtx, int));
 742
 743 extern rtx expand_shift PROTO((enum tree_code, enum machine_mode, rtx, tree, rtx, int));
 744 extern rtx expand_divmod PROTO((int, enum tree_code, enum machine_mode, rtx, rtx, rtx, int));
 745 extern void locate_and_pad_parm PROTO((enum machine_mode, tree, int, tree, struct args_size *, struct args_size *, struct args_size *));
 746 extern rtx expand_inline_function PROTO((tree, tree, rtx, int, tree, rtx));
 747 /* Return the CODE_LABEL rtx for a LABEL_DECL, creating it if necessary.  */
 748 extern rtx label_rtx PROTO((tree));
 749 #endif
 750
 751 /* Indicate how an input argument register was promoted.  */
 752 extern rtx promoted_input_arg PROTO((int, enum machine_mode *, int *));
 753
 754 /* Return an rtx like arg but sans any constant terms.
 755    Returns the original rtx if it has no constant terms.
 756    The constant terms are added and stored via a second arg.  */
 757 extern rtx eliminate_constant_term PROTO((rtx, rtx *));
 758
 759 /* Convert arg to a valid memory address for specified machine mode,
 760    by emitting insns to perform arithmetic if nec.  */
 761 extern rtx memory_address PROTO((enum machine_mode, rtx));
 762
 763 /* Like `memory_address' but pretent `flag_force_addr' is 0.  */
 764 extern rtx memory_address_noforce PROTO((enum machine_mode, rtx));
 765
 766 /* Return a memory reference like MEMREF, but with its mode changed
 767    to MODE and its address changed to ADDR.
 768    (VOIDmode means don't change the mode.
 769    NULL for ADDR means don't change the address.)  */
 770 extern rtx change_address PROTO((rtx, enum machine_mode, rtx));
 771
 772 /* Return a memory reference like MEMREF, but which is known to have a
 773    valid address.  */
 774
 775 extern rtx validize_mem PROTO((rtx));
 776
 777 /* Assemble the static constant template for function entry trampolines.  */
 778 extern rtx assemble_trampoline_template PROTO((void));
 779
 780 /* Return 1 if two rtx's are equivalent in structure and elements.  */
 781 extern int rtx_equal_p PROTO((rtx, rtx));
 782
 783 /* Given rtx, return new rtx whose address won't be affected by
 784    any side effects.  It has been copied to a new temporary reg.  */
 785 extern rtx stabilize PROTO((rtx));
 786
 787 /* Given an rtx, copy all regs it refers to into new temps
 788    and return a modified copy that refers to the new temps.  */
 789 extern rtx copy_all_regs PROTO((rtx));
 790
 791 /* Copy given rtx to a new temp reg and return that.  */
 792 extern rtx copy_to_reg PROTO((rtx));
 793
 794 /* Like copy_to_reg but always make the reg Pmode.  */
 795 extern rtx copy_addr_to_reg PROTO((rtx));
 796
 797 /* Like copy_to_reg but always make the reg the specified mode MODE.  */
 798 extern rtx copy_to_mode_reg PROTO((enum machine_mode, rtx));
 799
 800 /* Copy given rtx to given temp reg and return that.  */
 801 extern rtx copy_to_suggested_reg PROTO((rtx, rtx, enum machine_mode));
 802
 803 /* Copy a value to a register if it isn't already a register.
 804    Args are mode (in case value is a constant) and the value.  */
 805 extern rtx force_reg PROTO((enum machine_mode, rtx));
 806
 807 /* Return given rtx, copied into a new temp reg if it was in memory.  */
 808 extern rtx force_not_mem PROTO((rtx));
 809
 810 #ifdef TREE_CODE
 811 /* Return mode and signedness to use when object is promoted.  */
 812 extern enum machine_mode promote_mode PROTO((tree, enum machine_mode,
 813                                              int *, int));
 814 #endif
 815
 816 /* Remove some bytes from the stack.  An rtx says how many.  */
 817 extern void adjust_stack PROTO((rtx));
 818
 819 /* Add some bytes to the stack.  An rtx says how many.  */
 820 extern void anti_adjust_stack PROTO((rtx));
 821
 822 /* This enum is used for the following two functions.  */
 823 enum save_level {SAVE_BLOCK, SAVE_FUNCTION, SAVE_NONLOCAL};
 824
 825 /* Save the stack pointer at the specified level.  */
 826 extern void emit_stack_save PROTO((enum save_level, rtx *, rtx));
 827
 828 /* Restore the stack pointer from a save area of the specified level.  */
 829 extern void emit_stack_restore PROTO((enum save_level, rtx, rtx));
 830
 831 /* Allocate some space on the stack dynamically and return its address.  An rtx
 832    says how many bytes.  */
 833 extern rtx allocate_dynamic_stack_space PROTO((rtx, rtx, int));
 834
 835 /* Emit code to copy function value to a new temp reg and return that reg.  */
 836 extern rtx function_value ();
 837
 838 /* Return an rtx that refers to the value returned by a library call
 839    in its original home.  This becomes invalid if any more code is emitted.  */
 840 extern rtx hard_libcall_value PROTO((enum machine_mode));
 841
 842 /* Given an rtx, return an rtx for a value rounded up to a multiple
 843    of STACK_BOUNDARY / BITS_PER_UNIT.  */
 844 extern rtx round_push PROTO((rtx));
 845
 846 extern void emit_block_move PROTO((rtx, rtx, rtx, int));
 847
 848 extern rtx store_bit_field PROTO((rtx, int, int, enum machine_mode, rtx, int, int));
 849 extern rtx extract_bit_field PROTO((rtx, int, int, int, rtx, enum machine_mode, enum machine_mode, int, int));
 850 extern rtx expand_mult PROTO((enum machine_mode, rtx, rtx, rtx, int));
 851 extern rtx expand_mult_add PROTO((rtx, rtx, rtx, rtx,enum machine_mode, int));
 852 extern rtx expand_mult_highpart_adjust PROTO((enum machine_mode, rtx, rtx, rtx, rtx, int));
 853
 854 extern rtx assemble_static_space PROTO((int));
 855
 856 /* Hook called by expand_expr for language-specific tree codes.
 857    It is up to the language front end to install a hook
 858    if it has any such codes that expand_expr needs to know about.  */
 859 extern rtx (*lang_expand_expr) ();