gdtoaimp.h revision 1.1
1 /* $NetBSD: gdtoaimp.h,v 1.1 2006/01/25 15:18:48 kleink 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_8087 for IEEE-arithmetic machines where the least 85 * significant byte has the lowest address. 86 * #define IEEE_MC68k 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 #ifndef GDTOAIMP_H_INCLUDED 171 #define GDTOAIMP_H_INCLUDED 172 #include "gdtoa.h" 173 #include "gd_qnan.h" 174 175 #ifdef DEBUG 176 #include "stdio.h" 177 #define Bug(x) {fprintf(stderr, "%s\n", x); exit(1);} 178 #endif 179 180 #include "stdlib.h" 181 #include "string.h" 182 183 #ifdef KR_headers 184 #define Char char 185 #else 186 #define Char void 187 #endif 188 189 #ifdef MALLOC 190 extern Char *MALLOC ANSI((size_t)); 191 #else 192 #define MALLOC malloc 193 #endif 194 195 #undef IEEE_Arith 196 #undef Avoid_Underflow 197 #ifdef IEEE_MC68k 198 #define IEEE_Arith 199 #endif 200 #ifdef IEEE_8087 201 #define IEEE_Arith 202 #endif 203 204 #include "errno.h" 205 #ifdef Bad_float_h 206 207 #ifdef IEEE_Arith 208 #define DBL_DIG 15 209 #define DBL_MAX_10_EXP 308 210 #define DBL_MAX_EXP 1024 211 #define FLT_RADIX 2 212 #define DBL_MAX 1.7976931348623157e+308 213 #endif 214 215 #ifdef IBM 216 #define DBL_DIG 16 217 #define DBL_MAX_10_EXP 75 218 #define DBL_MAX_EXP 63 219 #define FLT_RADIX 16 220 #define DBL_MAX 7.2370055773322621e+75 221 #endif 222 223 #ifdef VAX 224 #define DBL_DIG 16 225 #define DBL_MAX_10_EXP 38 226 #define DBL_MAX_EXP 127 227 #define FLT_RADIX 2 228 #define DBL_MAX 1.7014118346046923e+38 229 #define n_bigtens 2 230 #endif 231 232 #ifndef LONG_MAX 233 #define LONG_MAX 2147483647 234 #endif 235 236 #else /* ifndef Bad_float_h */ 237 #include "float.h" 238 #endif /* Bad_float_h */ 239 240 #ifdef IEEE_Arith 241 #define Scale_Bit 0x10 242 #define n_bigtens 5 243 #endif 244 245 #ifdef IBM 246 #define n_bigtens 3 247 #endif 248 249 #ifdef VAX 250 #define n_bigtens 2 251 #endif 252 253 #ifndef __MATH_H__ 254 #include "math.h" 255 #endif 256 257 #ifdef __cplusplus 258 extern "C" { 259 #endif 260 261 #if defined(IEEE_8087) + defined(IEEE_MC68k) + defined(VAX) + defined(IBM) != 1 262 Exactly one of IEEE_8087, IEEE_MC68k, VAX, or IBM should be defined. 263 #endif 264 265 typedef union { double d; ULong L[2]; } U; 266 267 #ifdef YES_ALIAS 268 #define dval(x) x 269 #ifdef IEEE_8087 270 #define word0(x) ((ULong *)&x)[1] 271 #define word1(x) ((ULong *)&x)[0] 272 #else 273 #define word0(x) ((ULong *)&x)[0] 274 #define word1(x) ((ULong *)&x)[1] 275 #endif 276 #else /* !YES_ALIAS */ 277 #ifdef IEEE_8087 278 #define word0(x) ((U*)&x)->L[1] 279 #define word1(x) ((U*)&x)->L[0] 280 #else 281 #define word0(x) ((U*)&x)->L[0] 282 #define word1(x) ((U*)&x)->L[1] 283 #endif 284 #define dval(x) ((U*)&x)->d 285 #endif /* YES_ALIAS */ 286 287 /* The following definition of Storeinc is appropriate for MIPS processors. 288 * An alternative that might be better on some machines is 289 * #define Storeinc(a,b,c) (*a++ = b << 16 | c & 0xffff) 290 */ 291 #if defined(IEEE_8087) + defined(VAX) 292 #define Storeinc(a,b,c) (((unsigned short *)a)[1] = (unsigned short)b, \ 293 ((unsigned short *)a)[0] = (unsigned short)c, a++) 294 #else 295 #define Storeinc(a,b,c) (((unsigned short *)a)[0] = (unsigned short)b, \ 296 ((unsigned short *)a)[1] = (unsigned short)c, a++) 297 #endif 298 299 /* #define P DBL_MANT_DIG */ 300 /* Ten_pmax = floor(P*log(2)/log(5)) */ 301 /* Bletch = (highest power of 2 < DBL_MAX_10_EXP) / 16 */ 302 /* Quick_max = floor((P-1)*log(FLT_RADIX)/log(10) - 1) */ 303 /* Int_max = floor(P*log(FLT_RADIX)/log(10) - 1) */ 304 305 #ifdef IEEE_Arith 306 #define Exp_shift 20 307 #define Exp_shift1 20 308 #define Exp_msk1 0x100000 309 #define Exp_msk11 0x100000 310 #define Exp_mask 0x7ff00000 311 #define P 53 312 #define Bias 1023 313 #define Emin (-1022) 314 #define Exp_1 0x3ff00000 315 #define Exp_11 0x3ff00000 316 #define Ebits 11 317 #define Frac_mask 0xfffff 318 #define Frac_mask1 0xfffff 319 #define Ten_pmax 22 320 #define Bletch 0x10 321 #define Bndry_mask 0xfffff 322 #define Bndry_mask1 0xfffff 323 #define LSB 1 324 #define Sign_bit 0x80000000 325 #define Log2P 1 326 #define Tiny0 0 327 #define Tiny1 1 328 #define Quick_max 14 329 #define Int_max 14 330 331 #ifndef Flt_Rounds 332 #ifdef FLT_ROUNDS 333 #define Flt_Rounds FLT_ROUNDS 334 #else 335 #define Flt_Rounds 1 336 #endif 337 #endif /*Flt_Rounds*/ 338 339 #else /* ifndef IEEE_Arith */ 340 #undef Sudden_Underflow 341 #define Sudden_Underflow 342 #ifdef IBM 343 #undef Flt_Rounds 344 #define Flt_Rounds 0 345 #define Exp_shift 24 346 #define Exp_shift1 24 347 #define Exp_msk1 0x1000000 348 #define Exp_msk11 0x1000000 349 #define Exp_mask 0x7f000000 350 #define P 14 351 #define Bias 65 352 #define Exp_1 0x41000000 353 #define Exp_11 0x41000000 354 #define Ebits 8 /* exponent has 7 bits, but 8 is the right value in b2d */ 355 #define Frac_mask 0xffffff 356 #define Frac_mask1 0xffffff 357 #define Bletch 4 358 #define Ten_pmax 22 359 #define Bndry_mask 0xefffff 360 #define Bndry_mask1 0xffffff 361 #define LSB 1 362 #define Sign_bit 0x80000000 363 #define Log2P 4 364 #define Tiny0 0x100000 365 #define Tiny1 0 366 #define Quick_max 14 367 #define Int_max 15 368 #else /* VAX */ 369 #undef Flt_Rounds 370 #define Flt_Rounds 1 371 #define Exp_shift 23 372 #define Exp_shift1 7 373 #define Exp_msk1 0x80 374 #define Exp_msk11 0x800000 375 #define Exp_mask 0x7f80 376 #define P 56 377 #define Bias 129 378 #define Exp_1 0x40800000 379 #define Exp_11 0x4080 380 #define Ebits 8 381 #define Frac_mask 0x7fffff 382 #define Frac_mask1 0xffff007f 383 #define Ten_pmax 24 384 #define Bletch 2 385 #define Bndry_mask 0xffff007f 386 #define Bndry_mask1 0xffff007f 387 #define LSB 0x10000 388 #define Sign_bit 0x8000 389 #define Log2P 1 390 #define Tiny0 0x80 391 #define Tiny1 0 392 #define Quick_max 15 393 #define Int_max 15 394 #endif /* IBM, VAX */ 395 #endif /* IEEE_Arith */ 396 397 #ifndef IEEE_Arith 398 #define ROUND_BIASED 399 #endif 400 401 #ifdef RND_PRODQUOT 402 #define rounded_product(a,b) a = rnd_prod(a, b) 403 #define rounded_quotient(a,b) a = rnd_quot(a, b) 404 #ifdef KR_headers 405 extern double rnd_prod(), rnd_quot(); 406 #else 407 extern double rnd_prod(double, double), rnd_quot(double, double); 408 #endif 409 #else 410 #define rounded_product(a,b) a *= b 411 #define rounded_quotient(a,b) a /= b 412 #endif 413 414 #define Big0 (Frac_mask1 | Exp_msk1*(DBL_MAX_EXP+Bias-1)) 415 #define Big1 0xffffffff 416 417 #undef Pack_16 418 #ifndef Pack_32 419 #define Pack_32 420 #endif 421 422 #ifdef NO_LONG_LONG 423 #undef ULLong 424 #ifdef Just_16 425 #undef Pack_32 426 #define Pack_16 427 /* When Pack_32 is not defined, we store 16 bits per 32-bit Long. 428 * This makes some inner loops simpler and sometimes saves work 429 * during multiplications, but it often seems to make things slightly 430 * slower. Hence the default is now to store 32 bits per Long. 431 */ 432 #endif 433 #else /* long long available */ 434 #ifndef Llong 435 #define Llong long long 436 #endif 437 #ifndef ULLong 438 #define ULLong unsigned Llong 439 #endif 440 #endif /* NO_LONG_LONG */ 441 442 #ifdef Pack_32 443 #define ULbits 32 444 #define kshift 5 445 #define kmask 31 446 #define ALL_ON 0xffffffff 447 #else 448 #define ULbits 16 449 #define kshift 4 450 #define kmask 15 451 #define ALL_ON 0xffff 452 #endif 453 454 #ifndef MULTIPLE_THREADS 455 #define ACQUIRE_DTOA_LOCK(n) /*nothing*/ 456 #define FREE_DTOA_LOCK(n) /*nothing*/ 457 #endif 458 459 #define Kmax 15 460 461 struct 462 Bigint { 463 struct Bigint *next; 464 int k, maxwds, sign, wds; 465 ULong x[1]; 466 }; 467 468 typedef struct Bigint Bigint; 469 470 #ifdef NO_STRING_H 471 #ifdef DECLARE_SIZE_T 472 typedef unsigned int size_t; 473 #endif 474 extern void memcpy_D2A ANSI((void*, const void*, size_t)); 475 #define Bcopy(x,y) memcpy_D2A(&x->sign,&y->sign,y->wds*sizeof(ULong) + 2*sizeof(int)) 476 #else /* !NO_STRING_H */ 477 #define Bcopy(x,y) memcpy(&x->sign,&y->sign,y->wds*sizeof(ULong) + 2*sizeof(int)) 478 #endif /* NO_STRING_H */ 479 480 #define Balloc Balloc_D2A 481 #define Bfree Bfree_D2A 482 #define ULtoQ ULtoQ_D2A 483 #define ULtof ULtof_D2A 484 #define ULtod ULtod_D2A 485 #define ULtodd ULtodd_D2A 486 #define ULtox ULtox_D2A 487 #define ULtoxL ULtoxL_D2A 488 #define any_on any_on_D2A 489 #define b2d b2d_D2A 490 #define bigtens bigtens_D2A 491 #define cmp cmp_D2A 492 #define copybits copybits_D2A 493 #define d2b d2b_D2A 494 #define decrement decrement_D2A 495 #define diff diff_D2A 496 #define dtoa_result dtoa_result_D2A 497 #define g__fmt g__fmt_D2A 498 #define gethex gethex_D2A 499 #define hexdig hexdig_D2A 500 #define hexnan hexnan_D2A 501 #define hi0bits(x) hi0bits_D2A((ULong)(x)) 502 #define i2b i2b_D2A 503 #define increment increment_D2A 504 #define lo0bits lo0bits_D2A 505 #define lshift lshift_D2A 506 #define match match_D2A 507 #define mult mult_D2A 508 #define multadd multadd_D2A 509 #define nrv_alloc nrv_alloc_D2A 510 #define pow5mult pow5mult_D2A 511 #define quorem quorem_D2A 512 #define ratio ratio_D2A 513 #define rshift rshift_D2A 514 #define rv_alloc rv_alloc_D2A 515 #define s2b s2b_D2A 516 #define set_ones set_ones_D2A 517 #define strcp strcp_D2A 518 #define strtoIg strtoIg_D2A 519 #define sum sum_D2A 520 #define tens tens_D2A 521 #define tinytens tinytens_D2A 522 #define tinytens tinytens_D2A 523 #define trailz trailz_D2A 524 #define ulp ulp_D2A 525 526 extern char *dtoa_result; 527 extern CONST double bigtens[], tens[], tinytens[]; 528 extern unsigned char hexdig[]; 529 530 extern Bigint *Balloc ANSI((int)); 531 extern void Bfree ANSI((Bigint*)); 532 extern void ULtof ANSI((ULong*, ULong*, Long, int)); 533 extern void ULtod ANSI((ULong*, ULong*, Long, int)); 534 extern void ULtodd ANSI((ULong*, ULong*, Long, int)); 535 extern void ULtoQ ANSI((ULong*, ULong*, Long, int)); 536 extern void ULtox ANSI((UShort*, ULong*, Long, int)); 537 extern void ULtoxL ANSI((ULong*, ULong*, Long, int)); 538 extern ULong any_on ANSI((Bigint*, int)); 539 extern double b2d ANSI((Bigint*, int*)); 540 extern int cmp ANSI((Bigint*, Bigint*)); 541 extern void copybits ANSI((ULong*, int, Bigint*)); 542 extern Bigint *d2b ANSI((double, int*, int*)); 543 extern int decrement ANSI((Bigint*)); 544 extern Bigint *diff ANSI((Bigint*, Bigint*)); 545 extern char *dtoa ANSI((double d, int mode, int ndigits, 546 int *decpt, int *sign, char **rve)); 547 extern char *g__fmt ANSI((char*, char*, char*, int, ULong)); 548 extern int gethex ANSI((CONST char**, FPI*, Long*, Bigint**, int)); 549 extern void hexdig_init_D2A(Void); 550 extern int hexnan ANSI((CONST char**, FPI*, ULong*)); 551 extern int hi0bits_D2A ANSI((ULong)); 552 extern Bigint *i2b ANSI((int)); 553 extern Bigint *increment ANSI((Bigint*)); 554 extern int lo0bits ANSI((ULong*)); 555 extern Bigint *lshift ANSI((Bigint*, int)); 556 extern int match ANSI((CONST char**, char*)); 557 extern Bigint *mult ANSI((Bigint*, Bigint*)); 558 extern Bigint *multadd ANSI((Bigint*, int, int)); 559 extern char *nrv_alloc ANSI((char*, char **, int)); 560 extern Bigint *pow5mult ANSI((Bigint*, int)); 561 extern int quorem ANSI((Bigint*, Bigint*)); 562 extern double ratio ANSI((Bigint*, Bigint*)); 563 extern void rshift ANSI((Bigint*, int)); 564 extern char *rv_alloc ANSI((int)); 565 extern Bigint *s2b ANSI((CONST char*, int, int, ULong)); 566 extern Bigint *set_ones ANSI((Bigint*, int)); 567 extern char *strcp ANSI((char*, const char*)); 568 extern int strtoIg ANSI((CONST char*, char**, FPI*, Long*, Bigint**, int*)); 569 extern double strtod ANSI((const char *s00, char **se)); 570 extern Bigint *sum ANSI((Bigint*, Bigint*)); 571 extern int trailz ANSI((Bigint*)); 572 extern double ulp ANSI((double)); 573 574 #ifdef __cplusplus 575 } 576 #endif 577 /* 578 * NAN_WORD0 and NAN_WORD1 are only referenced in strtod.c. Prior to 579 * 20050115, they used to be hard-wired here (to 0x7ff80000 and 0, 580 * respectively), but now are determined by compiling and running 581 * qnan.c to generate gd_qnan.h, which specifies d_QNAN0 and d_QNAN1. 582 * Formerly gdtoaimp.h recommended supplying suitable -DNAN_WORD0=... 583 * and -DNAN_WORD1=... values if necessary. This should still work. 584 * (On HP Series 700/800 machines, -DNAN_WORD0=0x7ff40000 works.) 585 */ 586 #ifdef IEEE_Arith 587 #ifdef IEEE_MC68k 588 #define _0 0 589 #define _1 1 590 #ifndef NAN_WORD0 591 #define NAN_WORD0 d_QNAN0 592 #endif 593 #ifndef NAN_WORD1 594 #define NAN_WORD1 d_QNAN1 595 #endif 596 #else 597 #define _0 1 598 #define _1 0 599 #ifndef NAN_WORD0 600 #define NAN_WORD0 d_QNAN1 601 #endif 602 #ifndef NAN_WORD1 603 #define NAN_WORD1 d_QNAN0 604 #endif 605 #endif 606 #else 607 #undef INFNAN_CHECK 608 #endif 609 610 #undef SI 611 #ifdef Sudden_Underflow 612 #define SI 1 613 #else 614 #define SI 0 615 #endif 616 617 #endif /* GDTOAIMP_H_INCLUDED */ 618
Indexes created Tue Sep 30 07:10:03 GMT 2025