gdtoaimp.h revision 1.4
1 /* $NetBSD: gdtoaimp.h,v 1.4 2006/05/04 18:38:56 christos Exp $ */ 2 3 /**************************************************************** 4 5 The author of this software is David M. Gay. 6 7 Copyright (C) 1998-2000 by Lucent Technologies 8 All Rights Reserved 9 10 Permission to use, copy, modify, and distribute this software and 11 its documentation for any purpose and without fee is hereby 12 granted, provided that the above copyright notice appear in all 13 copies and that both that the copyright notice and this 14 permission notice and warranty disclaimer appear in supporting 15 documentation, and that the name of Lucent or any of its entities 16 not be used in advertising or publicity pertaining to 17 distribution of the software without specific, written prior 18 permission. 19 20 LUCENT DISCLAIMS ALL WARRANTIES WITH REGARD TO THIS SOFTWARE, 21 INCLUDING ALL IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS. 22 IN NO EVENT SHALL LUCENT OR ANY OF ITS ENTITIES BE LIABLE FOR ANY 23 SPECIAL, INDIRECT OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES 24 WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER 25 IN AN ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, 26 ARISING OUT OF OR IN CONNECTION WITH THE USE OR PERFORMANCE OF 27 THIS SOFTWARE. 28 29 ****************************************************************/ 30 31 /* This is a variation on dtoa.c that converts arbitary binary 32 floating-point formats to and from decimal notation. It uses 33 double-precision arithmetic internally, so there are still 34 various #ifdefs that adapt the calculations to the native 35 double-precision arithmetic (any of IEEE, VAX D_floating, 36 or IBM mainframe arithmetic). 37 38 Please send bug reports to David M. Gay (dmg at acm dot org, 39 with " at " changed at "@" and " dot " changed to "."). 40 */ 41 42 /* On a machine with IEEE extended-precision registers, it is 43 * necessary to specify double-precision (53-bit) rounding precision 44 * before invoking strtod or dtoa. If the machine uses (the equivalent 45 * of) Intel 80x87 arithmetic, the call 46 * _control87(PC_53, MCW_PC); 47 * does this with many compilers. Whether this or another call is 48 * appropriate depends on the compiler; for this to work, it may be 49 * necessary to #include "float.h" or another system-dependent header 50 * file. 51 */ 52 53 /* strtod for IEEE-, VAX-, and IBM-arithmetic machines. 54 * 55 * This strtod returns a nearest machine number to the input decimal 56 * string (or sets errno to ERANGE). With IEEE arithmetic, ties are 57 * broken by the IEEE round-even rule. Otherwise ties are broken by 58 * biased rounding (add half and chop). 59 * 60 * Inspired loosely by William D. Clinger's paper "How to Read Floating 61 * Point Numbers Accurately" [Proc. ACM SIGPLAN '90, pp. 112-126]. 62 * 63 * Modifications: 64 * 65 * 1. We only require IEEE, IBM, or VAX double-precision 66 * arithmetic (not IEEE double-extended). 67 * 2. We get by with floating-point arithmetic in a case that 68 * Clinger missed -- when we're computing d * 10^n 69 * for a small integer d and the integer n is not too 70 * much larger than 22 (the maximum integer k for which 71 * we can represent 10^k exactly), we may be able to 72 * compute (d*10^k) * 10^(e-k) with just one roundoff. 73 * 3. Rather than a bit-at-a-time adjustment of the binary 74 * result in the hard case, we use floating-point 75 * arithmetic to determine the adjustment to within 76 * one bit; only in really hard cases do we need to 77 * compute a second residual. 78 * 4. Because of 3., we don't need a large table of powers of 10 79 * for ten-to-e (just some small tables, e.g. of 10^k 80 * for 0 <= k <= 22). 81 */ 82 83 /* 84 * #define IEEE_LITTLE_ENDIAN for IEEE-arithmetic machines where the least 85 * significant byte has the lowest address. 86 * #define IEEE_BIG_ENDIAN for IEEE-arithmetic machines where the most 87 * significant byte has the lowest address. 88 * #define Long int on machines with 32-bit ints and 64-bit longs. 89 * #define Sudden_Underflow for IEEE-format machines without gradual 90 * underflow (i.e., that flush to zero on underflow). 91 * #define IBM for IBM mainframe-style floating-point arithmetic. 92 * #define VAX for VAX-style floating-point arithmetic (D_floating). 93 * #define No_leftright to omit left-right logic in fast floating-point 94 * computation of dtoa. 95 * #define Check_FLT_ROUNDS if FLT_ROUNDS can assume the values 2 or 3. 96 * #define RND_PRODQUOT to use rnd_prod and rnd_quot (assembly routines 97 * that use extended-precision instructions to compute rounded 98 * products and quotients) with IBM. 99 * #define ROUND_BIASED for IEEE-format with biased rounding. 100 * #define Inaccurate_Divide for IEEE-format with correctly rounded 101 * products but inaccurate quotients, e.g., for Intel i860. 102 * #define NO_LONG_LONG on machines that do not have a "long long" 103 * integer type (of >= 64 bits). On such machines, you can 104 * #define Just_16 to store 16 bits per 32-bit Long when doing 105 * high-precision integer arithmetic. Whether this speeds things 106 * up or slows things down depends on the machine and the number 107 * being converted. If long long is available and the name is 108 * something other than "long long", #define Llong to be the name, 109 * and if "unsigned Llong" does not work as an unsigned version of 110 * Llong, #define #ULLong to be the corresponding unsigned type. 111 * #define KR_headers for old-style C function headers. 112 * #define Bad_float_h if your system lacks a float.h or if it does not 113 * define some or all of DBL_DIG, DBL_MAX_10_EXP, DBL_MAX_EXP, 114 * FLT_RADIX, FLT_ROUNDS, and DBL_MAX. 115 * #define MALLOC your_malloc, where your_malloc(n) acts like malloc(n) 116 * if memory is available and otherwise does something you deem 117 * appropriate. If MALLOC is undefined, malloc will be invoked 118 * directly -- and assumed always to succeed. 119 * #define Omit_Private_Memory to omit logic (added Jan. 1998) for making 120 * memory allocations from a private pool of memory when possible. 121 * When used, the private pool is PRIVATE_MEM bytes long: 2304 bytes, 122 * unless #defined to be a different length. This default length 123 * suffices to get rid of MALLOC calls except for unusual cases, 124 * such as decimal-to-binary conversion of a very long string of 125 * digits. When converting IEEE double precision values, the 126 * longest string gdtoa can return is about 751 bytes long. For 127 * conversions by strtod of strings of 800 digits and all gdtoa 128 * conversions of IEEE doubles in single-threaded executions with 129 * 8-byte pointers, PRIVATE_MEM >= 7400 appears to suffice; with 130 * 4-byte pointers, PRIVATE_MEM >= 7112 appears adequate. 131 * #define INFNAN_CHECK on IEEE systems to cause strtod to check for 132 * Infinity and NaN (case insensitively). 133 * When INFNAN_CHECK is #defined and No_Hex_NaN is not #defined, 134 * strtodg also accepts (case insensitively) strings of the form 135 * NaN(x), where x is a string of hexadecimal digits and spaces; 136 * if there is only one string of hexadecimal digits, it is taken 137 * for the fraction bits of the resulting NaN; if there are two or 138 * more strings of hexadecimal digits, each string is assigned 139 * to the next available sequence of 32-bit words of fractions 140 * bits (starting with the most significant), right-aligned in 141 * each sequence. 142 * #define MULTIPLE_THREADS if the system offers preemptively scheduled 143 * multiple threads. In this case, you must provide (or suitably 144 * #define) two locks, acquired by ACQUIRE_DTOA_LOCK(n) and freed 145 * by FREE_DTOA_LOCK(n) for n = 0 or 1. (The second lock, accessed 146 * in pow5mult, ensures lazy evaluation of only one copy of high 147 * powers of 5; omitting this lock would introduce a small 148 * probability of wasting memory, but would otherwise be harmless.) 149 * You must also invoke freedtoa(s) to free the value s returned by 150 * dtoa. You may do so whether or not MULTIPLE_THREADS is #defined. 151 * #define IMPRECISE_INEXACT if you do not care about the setting of 152 * the STRTOG_Inexact bits in the special case of doing IEEE double 153 * precision conversions (which could also be done by the strtog in 154 * dtoa.c). 155 * #define NO_HEX_FP to disable recognition of C9x's hexadecimal 156 * floating-point constants. 157 * #define -DNO_ERRNO to suppress setting errno (in strtod.c and 158 * strtodg.c). 159 * #define NO_STRING_H to use private versions of memcpy. 160 * On some K&R systems, it may also be necessary to 161 * #define DECLARE_SIZE_T in this case. 162 * #define YES_ALIAS to permit aliasing certain double values with 163 * arrays of ULongs. This leads to slightly better code with 164 * some compilers and was always used prior to 19990916, but it 165 * is not strictly legal and can cause trouble with aggressively 166 * optimizing compilers (e.g., gcc 2.95.1 under -O2). 167 * #define USE_LOCALE to use the current locale's decimal_point value. 168 */ 169 170 /* #define IEEE_{BIG,LITTLE}_ENDIAN in ${ARCHDIR}/gdtoa/arith.h */ 171 172 #include <stdint.h> 173 #define Long int32_t 174 #define ULong uint32_t 175 #define LLong int64_t 176 #define ULLong uint64_t 177 178 #define INFNAN_CHECK 179 #ifdef _REENTRANT 180 #define MULTIPLE_THREADS 181 #endif 182 #define USE_LOCALE 183 184 #ifndef GDTOAIMP_H_INCLUDED 185 #define GDTOAIMP_H_INCLUDED 186 #include "gdtoa.h" 187 #include "gd_qnan.h" 188 189 #ifdef DEBUG 190 #include "stdio.h" 191 #define Bug(x) {fprintf(stderr, "%s\n", x); exit(1);} 192 #endif 193 194 #include "stdlib.h" 195 #include "string.h" 196 197 #ifdef KR_headers 198 #define Char char 199 #else 200 #define Char void 201 #endif 202 203 #ifdef MALLOC 204 extern Char *MALLOC ANSI((size_t)); 205 #else 206 #define MALLOC malloc 207 #endif 208 209 #undef IEEE_Arith 210 #undef Avoid_Underflow 211 #ifdef IEEE_BIG_ENDIAN 212 #define IEEE_Arith 213 #endif 214 #ifdef IEEE_LITTLE_ENDIAN 215 #define IEEE_Arith 216 #endif 217 218 #include "errno.h" 219 #ifdef Bad_float_h 220 221 #ifdef IEEE_Arith 222 #define DBL_DIG 15 223 #define DBL_MAX_10_EXP 308 224 #define DBL_MAX_EXP 1024 225 #define FLT_RADIX 2 226 #define DBL_MAX 1.7976931348623157e+308 227 #endif 228 229 #ifdef IBM 230 #define DBL_DIG 16 231 #define DBL_MAX_10_EXP 75 232 #define DBL_MAX_EXP 63 233 #define FLT_RADIX 16 234 #define DBL_MAX 7.2370055773322621e+75 235 #endif 236 237 #ifdef VAX 238 #define DBL_DIG 16 239 #define DBL_MAX_10_EXP 38 240 #define DBL_MAX_EXP 127 241 #define FLT_RADIX 2 242 #define DBL_MAX 1.7014118346046923e+38 243 #define n_bigtens 2 244 #endif 245 246 #ifndef LONG_MAX 247 #define LONG_MAX 2147483647 248 #endif 249 250 #else /* ifndef Bad_float_h */ 251 #include "float.h" 252 #endif /* Bad_float_h */ 253 254 #ifdef IEEE_Arith 255 #define Scale_Bit 0x10 256 #define n_bigtens 5 257 #endif 258 259 #ifdef IBM 260 #define n_bigtens 3 261 #endif 262 263 #ifdef VAX 264 #define n_bigtens 2 265 #endif 266 267 #include "math.h" 268 269 #ifdef __cplusplus 270 extern "C" { 271 #endif 272 273 #if defined(IEEE_LITTLE_ENDIAN) + defined(IEEE_BIG_ENDIAN) + defined(VAX) + defined(IBM) != 1 274 Exactly one of IEEE_LITTLE_ENDIAN, IEEE_BIG_ENDIAN, VAX, or IBM should be defined. 275 #endif 276 277 typedef union { double d; ULong L[2]; } U; 278 279 #ifdef YES_ALIAS 280 #define dval(x) x 281 #ifdef IEEE_LITTLE_ENDIAN 282 #define word0(x) ((ULong *)&x)[1] 283 #define word1(x) ((ULong *)&x)[0] 284 #else 285 #define word0(x) ((ULong *)&x)[0] 286 #define word1(x) ((ULong *)&x)[1] 287 #endif 288 #else /* !YES_ALIAS */ 289 #ifdef IEEE_LITTLE_ENDIAN 290 #define word0(x) ( /* LINTED */ (U*)&x)->L[1] 291 #define word1(x) ( /* LINTED */ (U*)&x)->L[0] 292 #else 293 #define word0(x) ( /* LINTED */ (U*)&x)->L[0] 294 #define word1(x) ( /* LINTED */ (U*)&x)->L[1] 295 #endif 296 #define dval(x) ( /* LINTED */ (U*)&x)->d 297 #endif /* YES_ALIAS */ 298 299 /* The following definition of Storeinc is appropriate for MIPS processors. 300 * An alternative that might be better on some machines is 301 * #define Storeinc(a,b,c) (*a++ = b << 16 | c & 0xffff) 302 */ 303 #if defined(IEEE_LITTLE_ENDIAN) + defined(VAX) 304 #define Storeinc(a,b,c) \ 305 (((unsigned short *)(void *)a)[1] = (unsigned short)b, \ 306 ((unsigned short *)(void *)a)[0] = (unsigned short)c, \ 307 a++) 308 #else 309 #define Storeinc(a,b,c) \ 310 (((unsigned short *)(void *)a)[0] = (unsigned short)b, \ 311 ((unsigned short *)(void *)a)[1] = (unsigned short)c, \ 312 a++) 313 #endif 314 315 /* #define P DBL_MANT_DIG */ 316 /* Ten_pmax = floor(P*log(2)/log(5)) */ 317 /* Bletch = (highest power of 2 < DBL_MAX_10_EXP) / 16 */ 318 /* Quick_max = floor((P-1)*log(FLT_RADIX)/log(10) - 1) */ 319 /* Int_max = floor(P*log(FLT_RADIX)/log(10) - 1) */ 320 321 #ifdef IEEE_Arith 322 #define Exp_shift 20 323 #define Exp_shift1 20 324 #define Exp_msk1 0x100000 325 #define Exp_msk11 0x100000 326 #define Exp_mask 0x7ff00000 327 #define P 53 328 #define Bias 1023 329 #define Emin (-1022) 330 #define Exp_1 0x3ff00000 331 #define Exp_11 0x3ff00000 332 #define Ebits 11 333 #define Frac_mask 0xfffff 334 #define Frac_mask1 0xfffff 335 #define Ten_pmax 22 336 #define Bletch 0x10 337 #define Bndry_mask 0xfffff 338 #define Bndry_mask1 0xfffff 339 #define LSB 1 340 #define Sign_bit 0x80000000 341 #define Log2P 1 342 #define Tiny0 0 343 #define Tiny1 1 344 #define Quick_max 14 345 #define Int_max 14 346 347 #ifndef Flt_Rounds 348 #ifdef FLT_ROUNDS 349 #define Flt_Rounds FLT_ROUNDS 350 #else 351 #define Flt_Rounds 1 352 #endif 353 #endif /*Flt_Rounds*/ 354 355 #else /* ifndef IEEE_Arith */ 356 #undef Sudden_Underflow 357 #define Sudden_Underflow 358 #ifdef IBM 359 #undef Flt_Rounds 360 #define Flt_Rounds 0 361 #define Exp_shift 24 362 #define Exp_shift1 24 363 #define Exp_msk1 0x1000000 364 #define Exp_msk11 0x1000000 365 #define Exp_mask 0x7f000000 366 #define P 14 367 #define Bias 65 368 #define Exp_1 0x41000000 369 #define Exp_11 0x41000000 370 #define Ebits 8 /* exponent has 7 bits, but 8 is the right value in b2d */ 371 #define Frac_mask 0xffffff 372 #define Frac_mask1 0xffffff 373 #define Bletch 4 374 #define Ten_pmax 22 375 #define Bndry_mask 0xefffff 376 #define Bndry_mask1 0xffffff 377 #define LSB 1 378 #define Sign_bit 0x80000000 379 #define Log2P 4 380 #define Tiny0 0x100000 381 #define Tiny1 0 382 #define Quick_max 14 383 #define Int_max 15 384 #else /* VAX */ 385 #undef Flt_Rounds 386 #define Flt_Rounds 1 387 #define Exp_shift 23 388 #define Exp_shift1 7 389 #define Exp_msk1 0x80 390 #define Exp_msk11 0x800000 391 #define Exp_mask 0x7f80 392 #define P 56 393 #define Bias 129 394 #define Exp_1 0x40800000 395 #define Exp_11 0x4080 396 #define Ebits 8 397 #define Frac_mask 0x7fffff 398 #define Frac_mask1 0xffff007f 399 #define Ten_pmax 24 400 #define Bletch 2 401 #define Bndry_mask 0xffff007f 402 #define Bndry_mask1 0xffff007f 403 #define LSB 0x10000 404 #define Sign_bit 0x8000 405 #define Log2P 1 406 #define Tiny0 0x80 407 #define Tiny1 0 408 #define Quick_max 15 409 #define Int_max 15 410 #endif /* IBM, VAX */ 411 #endif /* IEEE_Arith */ 412 413 #ifndef IEEE_Arith 414 #define ROUND_BIASED 415 #endif 416 417 #ifdef RND_PRODQUOT 418 #define rounded_product(a,b) a = rnd_prod(a, b) 419 #define rounded_quotient(a,b) a = rnd_quot(a, b) 420 #ifdef KR_headers 421 extern double rnd_prod(), rnd_quot(); 422 #else 423 extern double rnd_prod(double, double), rnd_quot(double, double); 424 #endif 425 #else 426 #define rounded_product(a,b) a *= b 427 #define rounded_quotient(a,b) a /= b 428 #endif 429 430 #define Big0 (Frac_mask1 | Exp_msk1*(DBL_MAX_EXP+Bias-1)) 431 #define Big1 0xffffffff 432 433 #undef Pack_16 434 #ifndef Pack_32 435 #define Pack_32 436 #endif 437 438 #ifdef NO_LONG_LONG 439 #undef ULLong 440 #ifdef Just_16 441 #undef Pack_32 442 #define Pack_16 443 /* When Pack_32 is not defined, we store 16 bits per 32-bit Long. 444 * This makes some inner loops simpler and sometimes saves work 445 * during multiplications, but it often seems to make things slightly 446 * slower. Hence the default is now to store 32 bits per Long. 447 */ 448 #endif 449 #else /* long long available */ 450 #ifndef Llong 451 #define Llong long long 452 #endif 453 #ifndef ULLong 454 #define ULLong unsigned Llong 455 #endif 456 #endif /* NO_LONG_LONG */ 457 458 #ifdef Pack_32 459 #define ULbits 32 460 #define kshift 5 461 #define kmask 31 462 #define ALL_ON 0xffffffff 463 #else 464 #define ULbits 16 465 #define kshift 4 466 #define kmask 15 467 #define ALL_ON 0xffff 468 #endif 469 470 #ifndef MULTIPLE_THREADS 471 #define ACQUIRE_DTOA_LOCK(n) /*nothing*/ 472 #define FREE_DTOA_LOCK(n) /*nothing*/ 473 #else 474 #include "reentrant.h" 475 476 extern mutex_t __gdtoa_locks[2]; 477 478 #define ACQUIRE_DTOA_LOCK(n) \ 479 do { \ 480 if (__isthreaded) \ 481 mutex_lock(&__gdtoa_locks[n]); \ 482 } while (/* CONSTCOND */ 0) 483 #define FREE_DTOA_LOCK(n) \ 484 do { \ 485 if (__isthreaded) \ 486 mutex_unlock(&__gdtoa_locks[n]); \ 487 } while (/* CONSTCOND */ 0) 488 #endif 489 490 #define Kmax 15 491 492 struct 493 Bigint { 494 struct Bigint *next; 495 int k, maxwds, sign, wds; 496 ULong x[1]; 497 }; 498 499 typedef struct Bigint Bigint; 500 501 #ifdef NO_STRING_H 502 #ifdef DECLARE_SIZE_T 503 typedef unsigned int size_t; 504 #endif 505 extern void memcpy_D2A ANSI((void*, const void*, size_t)); 506 #define Bcopy(x,y) memcpy_D2A(&x->sign,&y->sign,y->wds*sizeof(ULong) + 2*sizeof(int)) 507 #else /* !NO_STRING_H */ 508 #define Bcopy(x,y) memcpy(&x->sign,&y->sign,y->wds*sizeof(ULong) + 2*sizeof(int)) 509 #endif /* NO_STRING_H */ 510 511 #define Balloc __Balloc_D2A 512 #define Bfree __Bfree_D2A 513 #define ULtoQ __ULtoQ_D2A 514 #define ULtof __ULtof_D2A 515 #define ULtod __ULtod_D2A 516 #define ULtodd __ULtodd_D2A 517 #define ULtox __ULtox_D2A 518 #define ULtoxL __ULtoxL_D2A 519 #define any_on __any_on_D2A 520 #define b2d __b2d_D2A 521 #define bigtens __bigtens_D2A 522 #define cmp __cmp_D2A 523 #define copybits __copybits_D2A 524 #define d2b __d2b_D2A 525 #define decrement __decrement_D2A 526 #define diff __diff_D2A 527 #define dtoa_result __dtoa_result_D2A 528 #define g__fmt __g__fmt_D2A 529 #define gethex __gethex_D2A 530 #define hexdig __hexdig_D2A 531 #define hexdig_init_D2A __hexdig_init_D2A 532 #define hexnan __hexnan_D2A 533 #define hi0bits __hi0bits_D2A 534 #define hi0bits_D2A __hi0bits_D2A 535 #define i2b __i2b_D2A 536 #define increment __increment_D2A 537 #define lo0bits __lo0bits_D2A 538 #define lshift __lshift_D2A 539 #define match __match_D2A 540 #define mult __mult_D2A 541 #define multadd __multadd_D2A 542 #define nrv_alloc __nrv_alloc_D2A 543 #define pow5mult __pow5mult_D2A 544 #define quorem __quorem_D2A 545 #define ratio __ratio_D2A 546 #define rshift __rshift_D2A 547 #define rv_alloc __rv_alloc_D2A 548 #define s2b __s2b_D2A 549 #define set_ones __set_ones_D2A 550 #define strcp __strcp_D2A 551 #define strcp_D2A __strcp_D2A 552 #define strtoIg __strtoIg_D2A 553 #define sum __sum_D2A 554 #define tens __tens_D2A 555 #define tinytens __tinytens_D2A 556 #define tinytens __tinytens_D2A 557 #define trailz __trailz_D2A 558 #define ulp __ulp_D2A 559 560 extern char *dtoa_result; 561 extern CONST double bigtens[], tens[], tinytens[]; 562 extern unsigned char hexdig[]; 563 564 extern Bigint *Balloc ANSI((int)); 565 extern void Bfree ANSI((Bigint*)); 566 extern void ULtof ANSI((ULong*, ULong*, Long, int)); 567 extern void ULtod ANSI((ULong*, ULong*, Long, int)); 568 extern void ULtodd ANSI((ULong*, ULong*, Long, int)); 569 extern void ULtoQ ANSI((ULong*, ULong*, Long, int)); 570 extern void ULtox ANSI((UShort*, ULong*, Long, int)); 571 extern void ULtoxL ANSI((ULong*, ULong*, Long, int)); 572 extern ULong any_on ANSI((Bigint*, int)); 573 extern double b2d ANSI((Bigint*, int*)); 574 extern int cmp ANSI((Bigint*, Bigint*)); 575 extern void copybits ANSI((ULong*, int, Bigint*)); 576 extern Bigint *d2b ANSI((double, int*, int*)); 577 extern int decrement ANSI((Bigint*)); 578 extern Bigint *diff ANSI((Bigint*, Bigint*)); 579 extern char *dtoa ANSI((double d, int mode, int ndigits, 580 int *decpt, int *sign, char **rve)); 581 extern char *g__fmt ANSI((char*, char*, char*, int, ULong)); 582 extern int gethex ANSI((CONST char**, CONST FPI*, Long*, Bigint**, int)); 583 extern void hexdig_init_D2A(Void); 584 extern int hexnan ANSI((CONST char**, CONST FPI*, ULong*)); 585 extern int hi0bits_D2A ANSI((ULong)); 586 extern Bigint *i2b ANSI((int)); 587 extern Bigint *increment ANSI((Bigint*)); 588 extern int lo0bits ANSI((ULong*)); 589 extern Bigint *lshift ANSI((Bigint*, int)); 590 extern int match ANSI((CONST char**, CONST char*)); 591 extern Bigint *mult ANSI((Bigint*, Bigint*)); 592 extern Bigint *multadd ANSI((Bigint*, int, int)); 593 extern char *nrv_alloc ANSI((CONST char*, char **, int)); 594 extern Bigint *pow5mult ANSI((Bigint*, int)); 595 extern int quorem ANSI((Bigint*, Bigint*)); 596 extern double ratio ANSI((Bigint*, Bigint*)); 597 extern void rshift ANSI((Bigint*, int)); 598 extern char *rv_alloc ANSI((int)); 599 extern Bigint *s2b ANSI((CONST char*, int, int, ULong)); 600 extern Bigint *set_ones ANSI((Bigint*, int)); 601 extern char *strcp ANSI((char*, const char*)); 602 extern int strtoIg ANSI((CONST char*, char**, FPI*, Long*, Bigint**, int*)); 603 extern double strtod ANSI((const char *s00, char **se)); 604 extern Bigint *sum ANSI((Bigint*, Bigint*)); 605 extern int trailz ANSI((CONST Bigint*)); 606 extern double ulp ANSI((double)); 607 608 #ifdef __cplusplus 609 } 610 #endif 611 /* 612 * NAN_WORD0 and NAN_WORD1 are only referenced in strtod.c. Prior to 613 * 20050115, they used to be hard-wired here (to 0x7ff80000 and 0, 614 * respectively), but now are determined by compiling and running 615 * qnan.c to generate gd_qnan.h, which specifies d_QNAN0 and d_QNAN1. 616 * Formerly gdtoaimp.h recommended supplying suitable -DNAN_WORD0=... 617 * and -DNAN_WORD1=... values if necessary. This should still work. 618 * (On HP Series 700/800 machines, -DNAN_WORD0=0x7ff40000 works.) 619 */ 620 #ifdef IEEE_Arith 621 #ifdef IEEE_BIG_ENDIAN 622 #define _0 0 623 #define _1 1 624 #ifndef NAN_WORD0 625 #define NAN_WORD0 d_QNAN0 626 #endif 627 #ifndef NAN_WORD1 628 #define NAN_WORD1 d_QNAN1 629 #endif 630 #else 631 #define _0 1 632 #define _1 0 633 #ifndef NAN_WORD0 634 #define NAN_WORD0 d_QNAN1 635 #endif 636 #ifndef NAN_WORD1 637 #define NAN_WORD1 d_QNAN0 638 #endif 639 #endif 640 #else 641 #undef INFNAN_CHECK 642 #endif 643 644 #undef SI 645 #ifdef Sudden_Underflow 646 #define SI 1 647 #else 648 #define SI 0 649 #endif 650 651 #endif /* GDTOAIMP_H_INCLUDED */ 652
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