gdtoa/FreeBSD/gdtoaimp.h

   1 /****************************************************************
   2
   3 The author of this software is David M. Gay.
   4
   5 Copyright (C) 1998-2000 by Lucent Technologies
   6 All Rights Reserved
   7
   8 Permission to use, copy, modify, and distribute this software and
   9 its documentation for any purpose and without fee is hereby
  10 granted, provided that the above copyright notice appear in all
  11 copies and that both that the copyright notice and this
  12 permission notice and warranty disclaimer appear in supporting
  13 documentation, and that the name of Lucent or any of its entities
  14 not be used in advertising or publicity pertaining to
  15 distribution of the software without specific, written prior
  16 permission.
  17
  18 LUCENT DISCLAIMS ALL WARRANTIES WITH REGARD TO THIS SOFTWARE,
  19 INCLUDING ALL IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS.
  20 IN NO EVENT SHALL LUCENT OR ANY OF ITS ENTITIES BE LIABLE FOR ANY
  21 SPECIAL, INDIRECT OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
  22 WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER
  23 IN AN ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION,
  24 ARISING OUT OF OR IN CONNECTION WITH THE USE OR PERFORMANCE OF
  25 THIS SOFTWARE.
  26
  27 ****************************************************************/
  28
  29 /* This is a variation on dtoa.c that converts arbitary binary
  30    floating-point formats to and from decimal notation.  It uses
  31    double-precision arithmetic internally, so there are still
  32    various #ifdefs that adapt the calculations to the native
  33    double-precision arithmetic (any of IEEE, VAX D_floating,
  34    or IBM mainframe arithmetic).
  35
  36    Please send bug reports to David M. Gay (dmg at acm dot org,
  37    with " at " changed at "@" and " dot " changed to ".").
  38  */
  39
  40 /* On a machine with IEEE extended-precision registers, it is
  41  * necessary to specify double-precision (53-bit) rounding precision
  42  * before invoking strtod or dtoa.  If the machine uses (the equivalent
  43  * of) Intel 80x87 arithmetic, the call
  44  *      _control87(PC_53, MCW_PC);
  45  * does this with many compilers.  Whether this or another call is
  46  * appropriate depends on the compiler; for this to work, it may be
  47  * necessary to #include "float.h" or another system-dependent header
  48  * file.
  49  */
  50
  51 /* strtod for IEEE-, VAX-, and IBM-arithmetic machines.
  52  *
  53  * This strtod returns a nearest machine number to the input decimal
  54  * string (or sets errno to ERANGE).  With IEEE arithmetic, ties are
  55  * broken by the IEEE round-even rule.  Otherwise ties are broken by
  56  * biased rounding (add half and chop).
  57  *
  58  * Inspired loosely by William D. Clinger's paper "How to Read Floating
  59  * Point Numbers Accurately" [Proc. ACM SIGPLAN '90, pp. 112-126].
  60  *
  61  * Modifications:
  62  *
  63  *      1. We only require IEEE, IBM, or VAX double-precision
  64  *              arithmetic (not IEEE double-extended).
  65  *      2. We get by with floating-point arithmetic in a case that
  66  *              Clinger missed -- when we're computing d * 10^n
  67  *              for a small integer d and the integer n is not too
  68  *              much larger than 22 (the maximum integer k for which
  69  *              we can represent 10^k exactly), we may be able to
  70  *              compute (d*10^k) * 10^(e-k) with just one roundoff.
  71  *      3. Rather than a bit-at-a-time adjustment of the binary
  72  *              result in the hard case, we use floating-point
  73  *              arithmetic to determine the adjustment to within
  74  *              one bit; only in really hard cases do we need to
  75  *              compute a second residual.
  76  *      4. Because of 3., we don't need a large table of powers of 10
  77  *              for ten-to-e (just some small tables, e.g. of 10^k
  78  *              for 0 <= k <= 22).
  79  */
  80
  81 /*
  82  * #define IEEE_8087 for IEEE-arithmetic machines where the least
  83  *      significant byte has the lowest address.
  84  * #define IEEE_MC68k for IEEE-arithmetic machines where the most
  85  *      significant byte has the lowest address.
  86  * #define Long int on machines with 32-bit ints and 64-bit longs.
  87  * #define Sudden_Underflow for IEEE-format machines without gradual
  88  *      underflow (i.e., that flush to zero on underflow).
  89  * #define IBM for IBM mainframe-style floating-point arithmetic.
  90  * #define VAX for VAX-style floating-point arithmetic (D_floating).
  91  * #define No_leftright to omit left-right logic in fast floating-point
  92  *      computation of dtoa.
  93  * #define Check_FLT_ROUNDS if FLT_ROUNDS can assume the values 2 or 3.
  94  * #define RND_PRODQUOT to use rnd_prod and rnd_quot (assembly routines
  95  *      that use extended-precision instructions to compute rounded
  96  *      products and quotients) with IBM.
  97  * #define ROUND_BIASED for IEEE-format with biased rounding.
  98  * #define Inaccurate_Divide for IEEE-format with correctly rounded
  99  *      products but inaccurate quotients, e.g., for Intel i860.
 100  * #define NO_LONG_LONG on machines that do not have a "long long"
 101  *      integer type (of >= 64 bits).  On such machines, you can
 102  *      #define Just_16 to store 16 bits per 32-bit Long when doing
 103  *      high-precision integer arithmetic.  Whether this speeds things
 104  *      up or slows things down depends on the machine and the number
 105  *      being converted.  If long long is available and the name is
 106  *      something other than "long long", #define Llong to be the name,
 107  *      and if "unsigned Llong" does not work as an unsigned version of
 108  *      Llong, #define #ULLong to be the corresponding unsigned type.
 109  * #define KR_headers for old-style C function headers.
 110  * #define Bad_float_h if your system lacks a float.h or if it does not
 111  *      define some or all of DBL_DIG, DBL_MAX_10_EXP, DBL_MAX_EXP,
 112  *      FLT_RADIX, FLT_ROUNDS, and DBL_MAX.
 113  * #define MALLOC your_malloc, where your_malloc(n) acts like malloc(n)
 114  *      if memory is available and otherwise does something you deem
 115  *      appropriate.  If MALLOC is undefined, malloc will be invoked
 116  *      directly -- and assumed always to succeed.  Similarly, if you
 117  *      want something other than the system's free() to be called to
 118  *      recycle memory acquired from MALLOC, #define FREE to be the
 119  *      name of the alternate routine.  (FREE or free is only called in
 120  *      pathological cases, e.g., in a gdtoa call after a gdtoa return in
 121  *      mode 3 with thousands of digits requested.)
 122  * #define Omit_Private_Memory to omit logic (added Jan. 1998) for making
 123  *      memory allocations from a private pool of memory when possible.
 124  *      When used, the private pool is PRIVATE_MEM bytes long:  2304 bytes,
 125  *      unless #defined to be a different length.  This default length
 126  *      suffices to get rid of MALLOC calls except for unusual cases,
 127  *      such as decimal-to-binary conversion of a very long string of
 128  *      digits.  When converting IEEE double precision values, the
 129  *      longest string gdtoa can return is about 751 bytes long.  For
 130  *      conversions by strtod of strings of 800 digits and all gdtoa
 131  *      conversions of IEEE doubles in single-threaded executions with
 132  *      8-byte pointers, PRIVATE_MEM >= 7400 appears to suffice; with
 133  *      4-byte pointers, PRIVATE_MEM >= 7112 appears adequate.
 134  * #define NO_INFNAN_CHECK if you do not wish to have INFNAN_CHECK
 135  *      #defined automatically on IEEE systems.  On such systems,
 136  *      when INFNAN_CHECK is #defined, strtod checks
 137  *      for Infinity and NaN (case insensitively).
 138  *      When INFNAN_CHECK is #defined and No_Hex_NaN is not #defined,
 139  *      strtodg also accepts (case insensitively) strings of the form
 140  *      NaN(x), where x is a string of hexadecimal digits (optionally
 141  *      preceded by 0x or 0X) and spaces; if there is only one string
 142  *      of hexadecimal digits, it is taken for the fraction bits of the
 143  *      resulting NaN; if there are two or more strings of hexadecimal
 144  *      digits, each string is assigned to the next available sequence
 145  *      of 32-bit words of fractions bits (starting with the most
 146  *      significant), right-aligned in each sequence.
 147  *      Unless GDTOA_NON_PEDANTIC_NANCHECK is #defined, input "NaN(...)"
 148  *      is consumed even when ... has the wrong form (in which case the
 149  *      "(...)" is consumed but ignored).
 150  * #define MULTIPLE_THREADS if the system offers preemptively scheduled
 151  *      multiple threads.  In this case, you must provide (or suitably
 152  *      #define) two locks, acquired by ACQUIRE_DTOA_LOCK(n) and freed
 153  *      by FREE_DTOA_LOCK(n) for n = 0 or 1.  (The second lock, accessed
 154  *      in pow5mult, ensures lazy evaluation of only one copy of high
 155  *      powers of 5; omitting this lock would introduce a small
 156  *      probability of wasting memory, but would otherwise be harmless.)
 157  *      You must also invoke freedtoa(s) to free the value s returned by
 158  *      dtoa.  You may do so whether or not MULTIPLE_THREADS is #defined.
 159  * #define IMPRECISE_INEXACT if you do not care about the setting of
 160  *      the STRTOG_Inexact bits in the special case of doing IEEE double
 161  *      precision conversions (which could also be done by the strtod in
 162  *      dtoa.c).
 163  * #define NO_HEX_FP to disable recognition of C9x's hexadecimal
 164  *      floating-point constants.
 165  * #define -DNO_ERRNO to suppress setting errno (in strtod.c and
 166  *      strtodg.c).
 167  * #define NO_STRING_H to use private versions of memcpy.
 168  *      On some K&R systems, it may also be necessary to
 169  *      #define DECLARE_SIZE_T in this case.
 170  * #define USE_LOCALE to use the current locale's decimal_point value.
 171  */
 172
 173 #ifndef GDTOAIMP_H_INCLUDED
 174 #define GDTOAIMP_H_INCLUDED
 175 #include "gdtoa.h"
 176 #include "gd_qnan.h"
 177 #ifdef Honor_FLT_ROUNDS
 178 #include <fenv.h>
 179 #endif
 180
 181 #ifdef DEBUG
 182 #include "stdio.h"
 183 #define Bug(x) {fprintf(stderr, "%s\n", x); exit(1);}
 184 #endif
 185
 186 #include "stdlib.h"
 187 #include "string.h"
 188
 189 #ifdef KR_headers
 190 #define Char char
 191 #else
 192 #define Char void
 193 #endif
 194
 195 #ifdef MALLOC
 196 extern Char *MALLOC ANSI((size_t));
 197 #else
 198 #define MALLOC malloc
 199 #endif
 200
 201 #undef IEEE_Arith
 202 #undef Avoid_Underflow
 203 #ifdef IEEE_MC68k
 204 #define IEEE_Arith
 205 #endif
 206 #ifdef IEEE_8087
 207 #define IEEE_Arith
 208 #endif
 209
 210 #include "errno.h"
 211 #ifdef Bad_float_h
 212
 213 #ifdef IEEE_Arith
 214 #define DBL_DIG 15
 215 #define DBL_MAX_10_EXP 308
 216 #define DBL_MAX_EXP 1024
 217 #define FLT_RADIX 2
 218 #define DBL_MAX 1.7976931348623157e+308
 219 #endif
 220
 221 #ifdef IBM
 222 #define DBL_DIG 16
 223 #define DBL_MAX_10_EXP 75
 224 #define DBL_MAX_EXP 63
 225 #define FLT_RADIX 16
 226 #define DBL_MAX 7.2370055773322621e+75
 227 #endif
 228
 229 #ifdef VAX
 230 #define DBL_DIG 16
 231 #define DBL_MAX_10_EXP 38
 232 #define DBL_MAX_EXP 127
 233 #define FLT_RADIX 2
 234 #define DBL_MAX 1.7014118346046923e+38
 235 #define n_bigtens 2
 236 #endif
 237
 238 #ifndef LONG_MAX
 239 #define LONG_MAX 2147483647
 240 #endif
 241
 242 #else /* ifndef Bad_float_h */
 243 #include "float.h"
 244 #endif /* Bad_float_h */
 245
 246 #ifdef IEEE_Arith
 247 #define Scale_Bit 0x10
 248 #define n_bigtens 5
 249 #endif
 250
 251 #ifdef IBM
 252 #define n_bigtens 3
 253 #endif
 254
 255 #ifdef VAX
 256 #define n_bigtens 2
 257 #endif
 258
 259 #ifndef __MATH_H__
 260 #include "math.h"
 261 #endif
 262
 263 #ifdef __cplusplus
 264 extern "C" {
 265 #endif
 266
 267 #if defined(IEEE_8087) + defined(IEEE_MC68k) + defined(VAX) + defined(IBM) != 1
 268 Exactly one of IEEE_8087, IEEE_MC68k, VAX, or IBM should be defined.
 269 #endif
 270
 271 typedef union { double d; ULong L[2]; } U;
 272
 273 #ifdef IEEE_8087
 274 #define word0(x) (x)->L[1]
 275 #define word1(x) (x)->L[0]
 276 #else
 277 #define word0(x) (x)->L[0]
 278 #define word1(x) (x)->L[1]
 279 #endif
 280 #define dval(x) (x)->d
 281
 282 /* The following definition of Storeinc is appropriate for MIPS processors.
 283  * An alternative that might be better on some machines is
 284  * #define Storeinc(a,b,c) (*a++ = b << 16 | c & 0xffff)
 285  */
 286 #if defined(IEEE_8087) + defined(VAX)
 287 #define Storeinc(a,b,c) (((unsigned short *)a)[1] = (unsigned short)b, \
 288 ((unsigned short *)a)[0] = (unsigned short)c, a++)
 289 #else
 290 #define Storeinc(a,b,c) (((unsigned short *)a)[0] = (unsigned short)b, \
 291 ((unsigned short *)a)[1] = (unsigned short)c, a++)
 292 #endif
 293
 294 /* #define P DBL_MANT_DIG */
 295 /* Ten_pmax = floor(P*log(2)/log(5)) */
 296 /* Bletch = (highest power of 2 < DBL_MAX_10_EXP) / 16 */
 297 /* Quick_max = floor((P-1)*log(FLT_RADIX)/log(10) - 1) */
 298 /* Int_max = floor(P*log(FLT_RADIX)/log(10) - 1) */
 299
 300 #ifdef IEEE_Arith
 301 #define Exp_shift  20
 302 #define Exp_shift1 20
 303 #define Exp_msk1    0x100000
 304 #define Exp_msk11   0x100000
 305 #define Exp_mask  0x7ff00000
 306 #define P 53
 307 #define Bias 1023
 308 #define Emin (-1022)
 309 #define Exp_1  0x3ff00000
 310 #define Exp_11 0x3ff00000
 311 #define Ebits 11
 312 #define Frac_mask  0xfffff
 313 #define Frac_mask1 0xfffff
 314 #define Ten_pmax 22
 315 #define Bletch 0x10
 316 #define Bndry_mask  0xfffff
 317 #define Bndry_mask1 0xfffff
 318 #define LSB 1
 319 #define Sign_bit 0x80000000
 320 #define Log2P 1
 321 #define Tiny0 0
 322 #define Tiny1 1
 323 #define Quick_max 14
 324 #define Int_max 14
 325
 326 #ifndef Flt_Rounds
 327 #ifdef FLT_ROUNDS
 328 #define Flt_Rounds FLT_ROUNDS
 329 #else
 330 #define Flt_Rounds 1
 331 #endif
 332 #endif /*Flt_Rounds*/
 333
 334 #else /* ifndef IEEE_Arith */
 335 #undef  Sudden_Underflow
 336 #define Sudden_Underflow
 337 #ifdef IBM
 338 #undef Flt_Rounds
 339 #define Flt_Rounds 0
 340 #define Exp_shift  24
 341 #define Exp_shift1 24
 342 #define Exp_msk1   0x1000000
 343 #define Exp_msk11  0x1000000
 344 #define Exp_mask  0x7f000000
 345 #define P 14
 346 #define Bias 65
 347 #define Exp_1  0x41000000
 348 #define Exp_11 0x41000000
 349 #define Ebits 8 /* exponent has 7 bits, but 8 is the right value in b2d */
 350 #define Frac_mask  0xffffff
 351 #define Frac_mask1 0xffffff
 352 #define Bletch 4
 353 #define Ten_pmax 22
 354 #define Bndry_mask  0xefffff
 355 #define Bndry_mask1 0xffffff
 356 #define LSB 1
 357 #define Sign_bit 0x80000000
 358 #define Log2P 4
 359 #define Tiny0 0x100000
 360 #define Tiny1 0
 361 #define Quick_max 14
 362 #define Int_max 15
 363 #else /* VAX */
 364 #undef Flt_Rounds
 365 #define Flt_Rounds 1
 366 #define Exp_shift  23
 367 #define Exp_shift1 7
 368 #define Exp_msk1    0x80
 369 #define Exp_msk11   0x800000
 370 #define Exp_mask  0x7f80
 371 #define P 56
 372 #define Bias 129
 373 #define Exp_1  0x40800000
 374 #define Exp_11 0x4080
 375 #define Ebits 8
 376 #define Frac_mask  0x7fffff
 377 #define Frac_mask1 0xffff007f
 378 #define Ten_pmax 24
 379 #define Bletch 2
 380 #define Bndry_mask  0xffff007f
 381 #define Bndry_mask1 0xffff007f
 382 #define LSB 0x10000
 383 #define Sign_bit 0x8000
 384 #define Log2P 1
 385 #define Tiny0 0x80
 386 #define Tiny1 0
 387 #define Quick_max 15
 388 #define Int_max 15
 389 #endif /* IBM, VAX */
 390 #endif /* IEEE_Arith */
 391
 392 #ifndef IEEE_Arith
 393 #define ROUND_BIASED
 394 #endif
 395
 396 #ifdef RND_PRODQUOT
 397 #define rounded_product(a,b) a = rnd_prod(a, b)
 398 #define rounded_quotient(a,b) a = rnd_quot(a, b)
 399 #ifdef KR_headers
 400 extern double rnd_prod(), rnd_quot();
 401 #else
 402 extern double rnd_prod(double, double), rnd_quot(double, double);
 403 #endif
 404 #else
 405 #define rounded_product(a,b) a *= b
 406 #define rounded_quotient(a,b) a /= b
 407 #endif
 408
 409 #define Big0 (Frac_mask1 | Exp_msk1*(DBL_MAX_EXP+Bias-1))
 410 #define Big1 0xffffffff
 411
 412 #undef  Pack_16
 413 #ifndef Pack_32
 414 #define Pack_32
 415 #endif
 416
 417 #ifdef NO_LONG_LONG
 418 #undef ULLong
 419 #ifdef Just_16
 420 #undef Pack_32
 421 #define Pack_16
 422 /* When Pack_32 is not defined, we store 16 bits per 32-bit Long.
 423  * This makes some inner loops simpler and sometimes saves work
 424  * during multiplications, but it often seems to make things slightly
 425  * slower.  Hence the default is now to store 32 bits per Long.
 426  */
 427 #endif
 428 #else   /* long long available */
 429 #ifndef Llong
 430 #define Llong long long
 431 #endif
 432 #ifndef ULLong
 433 #define ULLong unsigned Llong
 434 #endif
 435 #endif /* NO_LONG_LONG */
 436
 437 #ifdef Pack_32
 438 #define ULbits 32
 439 #define kshift 5
 440 #define kmask 31
 441 #define ALL_ON 0xffffffff
 442 #else
 443 #define ULbits 16
 444 #define kshift 4
 445 #define kmask 15
 446 #define ALL_ON 0xffff
 447 #endif
 448
 449 #ifndef MULTIPLE_THREADS
 450 #define ACQUIRE_DTOA_LOCK(n)    /*nothing*/
 451 #define FREE_DTOA_LOCK(n)       /*nothing*/
 452 #endif
 453
 454 #define Kmax 9
 455
 456  struct
 457 Bigint {
 458         struct Bigint *next;
 459         int k, maxwds, sign, wds;
 460         ULong x[1];
 461         };
 462
 463  typedef struct Bigint Bigint;
 464
 465 #ifdef NO_STRING_H
 466 #ifdef DECLARE_SIZE_T
 467 typedef unsigned int size_t;
 468 #endif
 469 extern void memcpy_D2A ANSI((void*, const void*, size_t));
 470 #define Bcopy(x,y) memcpy_D2A(&x->sign,&y->sign,y->wds*sizeof(ULong) + 2*sizeof(int))
 471 #else /* !NO_STRING_H */
 472 #define Bcopy(x,y) memcpy(&x->sign,&y->sign,y->wds*sizeof(ULong) + 2*sizeof(int))
 473 #endif /* NO_STRING_H */
 474
 475 #define Balloc Balloc_D2A
 476 #define Bfree Bfree_D2A
 477 #define ULtoQ ULtoQ_D2A
 478 #define ULtof ULtof_D2A
 479 #define ULtod ULtod_D2A
 480 #define ULtodd ULtodd_D2A
 481 #define ULtox ULtox_D2A
 482 #define ULtoxL ULtoxL_D2A
 483 #define any_on any_on_D2A
 484 #define b2d b2d_D2A
 485 #define bigtens bigtens_D2A
 486 #define cmp cmp_D2A
 487 #define copybits copybits_D2A
 488 #define d2b d2b_D2A
 489 #define decrement decrement_D2A
 490 #define diff diff_D2A
 491 #define dtoa_result dtoa_result_D2A
 492 #define g__fmt g__fmt_D2A
 493 #define gethex gethex_D2A
 494 #define hexdig hexdig_D2A
 495 #define hexnan hexnan_D2A
 496 #define hi0bits(x) hi0bits_D2A((ULong)(x))
 497 #define i2b i2b_D2A
 498 #define increment increment_D2A
 499 #define lo0bits lo0bits_D2A
 500 #define lshift lshift_D2A
 501 #define match match_D2A
 502 #define mult mult_D2A
 503 #define multadd multadd_D2A
 504 #define nrv_alloc nrv_alloc_D2A
 505 #define pow5mult pow5mult_D2A
 506 #define quorem quorem_D2A
 507 #define ratio ratio_D2A
 508 #define rshift rshift_D2A
 509 #define rv_alloc rv_alloc_D2A
 510 #define s2b s2b_D2A
 511 #define set_ones set_ones_D2A
 512 #define strcp strcp_D2A
 513 #define strtoIg strtoIg_D2A
 514 #define sum sum_D2A
 515 #define tens tens_D2A
 516 #define tinytens tinytens_D2A
 517 #define tinytens tinytens_D2A
 518 #define trailz trailz_D2A
 519 #define ulp ulp_D2A
 520
 521  extern char *dtoa_result;
 522  extern CONST double bigtens[], tens[], tinytens[];
 523  extern unsigned char hexdig[];
 524
 525  extern Bigint *Balloc ANSI((int));
 526  extern void Bfree ANSI((Bigint*));
 527  extern void ULtof ANSI((ULong*, ULong*, Long, int));
 528  extern void ULtod ANSI((ULong*, ULong*, Long, int));
 529  extern void ULtodd ANSI((ULong*, ULong*, Long, int));
 530  extern void ULtoQ ANSI((ULong*, ULong*, Long, int));
 531  extern void ULtox ANSI((UShort*, ULong*, Long, int));
 532  extern void ULtoxL ANSI((ULong*, ULong*, Long, int));
 533  extern ULong any_on ANSI((Bigint*, int));
 534  extern double b2d ANSI((Bigint*, int*));
 535  extern int cmp ANSI((Bigint*, Bigint*));
 536  extern void copybits ANSI((ULong*, int, Bigint*));
 537  extern Bigint *d2b ANSI((double, int*, int*));
 538  extern void decrement ANSI((Bigint*));
 539  extern Bigint *diff ANSI((Bigint*, Bigint*));
 540  extern char *dtoa ANSI((double d, int mode, int ndigits,
 541                         int *decpt, int *sign, char **rve));
 542  extern char *g__fmt ANSI((char*, char*, char*, int, ULong, size_t));
 543  extern int gethex ANSI((CONST char**, FPI*, Long*, Bigint**, int));
 544  extern void hexdig_init_D2A(Void);
 545  extern int hexnan ANSI((CONST char**, FPI*, ULong*));
 546  extern int hi0bits_D2A ANSI((ULong));
 547  extern Bigint *i2b ANSI((int));
 548  extern Bigint *increment ANSI((Bigint*));
 549  extern int lo0bits ANSI((ULong*));
 550  extern Bigint *lshift ANSI((Bigint*, int));
 551  extern int match ANSI((CONST char**, char*));
 552  extern Bigint *mult ANSI((Bigint*, Bigint*));
 553  extern Bigint *multadd ANSI((Bigint*, int, int));
 554  extern char *nrv_alloc ANSI((char*, char **, int));
 555  extern Bigint *pow5mult ANSI((Bigint*, int));
 556  extern int quorem ANSI((Bigint*, Bigint*));
 557  extern double ratio ANSI((Bigint*, Bigint*));
 558  extern void rshift ANSI((Bigint*, int));
 559  extern char *rv_alloc ANSI((int));
 560  extern Bigint *s2b ANSI((CONST char*, int, int, ULong, int));
 561  extern Bigint *set_ones ANSI((Bigint*, int));
 562  extern char *strcp ANSI((char*, const char*));
 563  extern int strtoIg ANSI((CONST char*, char**, FPI*, Long*, Bigint**, int*));
 564  extern double strtod ANSI((const char *s00, char **se));
 565  extern Bigint *sum ANSI((Bigint*, Bigint*));
 566  extern int trailz ANSI((Bigint*));
 567  extern double ulp ANSI((U*));
 568
 569 #ifdef __cplusplus
 570 }
 571 #endif
 572 /*
 573  * NAN_WORD0 and NAN_WORD1 are only referenced in strtod.c.  Prior to
 574  * 20050115, they used to be hard-wired here (to 0x7ff80000 and 0,
 575  * respectively), but now are determined by compiling and running
 576  * qnan.c to generate gd_qnan.h, which specifies d_QNAN0 and d_QNAN1.
 577  * Formerly gdtoaimp.h recommended supplying suitable -DNAN_WORD0=...
 578  * and -DNAN_WORD1=...  values if necessary.  This should still work.
 579  * (On HP Series 700/800 machines, -DNAN_WORD0=0x7ff40000 works.)
 580  */
 581 #ifdef IEEE_Arith
 582 #ifndef NO_INFNAN_CHECK
 583 #undef INFNAN_CHECK
 584 #define INFNAN_CHECK
 585 #endif
 586 #ifdef IEEE_MC68k
 587 #define _0 0
 588 #define _1 1
 589 #ifndef NAN_WORD0
 590 #define NAN_WORD0 d_QNAN0
 591 #endif
 592 #ifndef NAN_WORD1
 593 #define NAN_WORD1 d_QNAN1
 594 #endif
 595 #else
 596 #define _0 1
 597 #define _1 0
 598 #ifndef NAN_WORD0
 599 #define NAN_WORD0 d_QNAN1
 600 #endif
 601 #ifndef NAN_WORD1
 602 #define NAN_WORD1 d_QNAN0
 603 #endif
 604 #endif
 605 #else
 606 #undef INFNAN_CHECK
 607 #endif
 608
 609 #undef SI
 610 #ifdef Sudden_Underflow
 611 #define SI 1
 612 #else
 613 #define SI 0
 614 #endif
 615
 616 #endif /* GDTOAIMP_H_INCLUDED */