Annotation of src/lib/libc/gdtoa/gdtoaimp.h, Revision 1.3
1.3 ! kleink 1: /* $NetBSD: gdtoaimp.h,v 1.2 2006/01/25 15:27:42 kleink Exp $ */
1.1 kleink 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: /*
1.2 kleink 84: * #define IEEE_LITTLE_ENDIAN for IEEE-arithmetic machines where the least
1.1 kleink 85: * significant byte has the lowest address.
1.2 kleink 86: * #define IEEE_BIG_ENDIAN for IEEE-arithmetic machines where the most
1.1 kleink 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:
1.2 kleink 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: #define MULTIPLE_THREADS
180: #define USE_LOCALE
181:
1.1 kleink 182: #ifndef GDTOAIMP_H_INCLUDED
183: #define GDTOAIMP_H_INCLUDED
184: #include "gdtoa.h"
185: #include "gd_qnan.h"
186:
187: #ifdef DEBUG
188: #include "stdio.h"
189: #define Bug(x) {fprintf(stderr, "%s\n", x); exit(1);}
190: #endif
191:
192: #include "stdlib.h"
193: #include "string.h"
194:
195: #ifdef KR_headers
196: #define Char char
197: #else
198: #define Char void
199: #endif
200:
201: #ifdef MALLOC
202: extern Char *MALLOC ANSI((size_t));
203: #else
204: #define MALLOC malloc
205: #endif
206:
207: #undef IEEE_Arith
208: #undef Avoid_Underflow
1.2 kleink 209: #ifdef IEEE_BIG_ENDIAN
1.1 kleink 210: #define IEEE_Arith
211: #endif
1.2 kleink 212: #ifdef IEEE_LITTLE_ENDIAN
1.1 kleink 213: #define IEEE_Arith
214: #endif
215:
216: #include "errno.h"
217: #ifdef Bad_float_h
218:
219: #ifdef IEEE_Arith
220: #define DBL_DIG 15
221: #define DBL_MAX_10_EXP 308
222: #define DBL_MAX_EXP 1024
223: #define FLT_RADIX 2
224: #define DBL_MAX 1.7976931348623157e+308
225: #endif
226:
227: #ifdef IBM
228: #define DBL_DIG 16
229: #define DBL_MAX_10_EXP 75
230: #define DBL_MAX_EXP 63
231: #define FLT_RADIX 16
232: #define DBL_MAX 7.2370055773322621e+75
233: #endif
234:
235: #ifdef VAX
236: #define DBL_DIG 16
237: #define DBL_MAX_10_EXP 38
238: #define DBL_MAX_EXP 127
239: #define FLT_RADIX 2
240: #define DBL_MAX 1.7014118346046923e+38
241: #define n_bigtens 2
242: #endif
243:
244: #ifndef LONG_MAX
245: #define LONG_MAX 2147483647
246: #endif
247:
248: #else /* ifndef Bad_float_h */
249: #include "float.h"
250: #endif /* Bad_float_h */
251:
252: #ifdef IEEE_Arith
253: #define Scale_Bit 0x10
254: #define n_bigtens 5
255: #endif
256:
257: #ifdef IBM
258: #define n_bigtens 3
259: #endif
260:
261: #ifdef VAX
262: #define n_bigtens 2
263: #endif
264:
265: #include "math.h"
266:
267: #ifdef __cplusplus
268: extern "C" {
269: #endif
270:
1.2 kleink 271: #if defined(IEEE_LITTLE_ENDIAN) + defined(IEEE_BIG_ENDIAN) + defined(VAX) + defined(IBM) != 1
272: Exactly one of IEEE_LITTLE_ENDIAN, IEEE_BIG_ENDIAN, VAX, or IBM should be defined.
1.1 kleink 273: #endif
274:
275: typedef union { double d; ULong L[2]; } U;
276:
277: #ifdef YES_ALIAS
278: #define dval(x) x
1.2 kleink 279: #ifdef IEEE_LITTLE_ENDIAN
1.1 kleink 280: #define word0(x) ((ULong *)&x)[1]
281: #define word1(x) ((ULong *)&x)[0]
282: #else
283: #define word0(x) ((ULong *)&x)[0]
284: #define word1(x) ((ULong *)&x)[1]
285: #endif
286: #else /* !YES_ALIAS */
1.2 kleink 287: #ifdef IEEE_LITTLE_ENDIAN
288: #define word0(x) ( /* LINTED */ (U*)&x)->L[1]
289: #define word1(x) ( /* LINTED */ (U*)&x)->L[0]
1.1 kleink 290: #else
1.2 kleink 291: #define word0(x) ( /* LINTED */ (U*)&x)->L[0]
292: #define word1(x) ( /* LINTED */ (U*)&x)->L[1]
1.1 kleink 293: #endif
1.2 kleink 294: #define dval(x) ( /* LINTED */ (U*)&x)->d
1.1 kleink 295: #endif /* YES_ALIAS */
296:
297: /* The following definition of Storeinc is appropriate for MIPS processors.
298: * An alternative that might be better on some machines is
299: * #define Storeinc(a,b,c) (*a++ = b << 16 | c & 0xffff)
300: */
1.2 kleink 301: #if defined(IEEE_LITTLE_ENDIAN) + defined(VAX)
302: #define Storeinc(a,b,c) \
303: (((unsigned short *)(void *)a)[1] = (unsigned short)b, \
304: ((unsigned short *)(void *)a)[0] = (unsigned short)c, \
305: a++)
306: #else
307: #define Storeinc(a,b,c) \
308: (((unsigned short *)(void *)a)[0] = (unsigned short)b, \
309: ((unsigned short *)(void *)a)[1] = (unsigned short)c, \
310: a++)
1.1 kleink 311: #endif
312:
313: /* #define P DBL_MANT_DIG */
314: /* Ten_pmax = floor(P*log(2)/log(5)) */
315: /* Bletch = (highest power of 2 < DBL_MAX_10_EXP) / 16 */
316: /* Quick_max = floor((P-1)*log(FLT_RADIX)/log(10) - 1) */
317: /* Int_max = floor(P*log(FLT_RADIX)/log(10) - 1) */
318:
319: #ifdef IEEE_Arith
320: #define Exp_shift 20
321: #define Exp_shift1 20
322: #define Exp_msk1 0x100000
323: #define Exp_msk11 0x100000
324: #define Exp_mask 0x7ff00000
325: #define P 53
326: #define Bias 1023
327: #define Emin (-1022)
328: #define Exp_1 0x3ff00000
329: #define Exp_11 0x3ff00000
330: #define Ebits 11
331: #define Frac_mask 0xfffff
332: #define Frac_mask1 0xfffff
333: #define Ten_pmax 22
334: #define Bletch 0x10
335: #define Bndry_mask 0xfffff
336: #define Bndry_mask1 0xfffff
337: #define LSB 1
338: #define Sign_bit 0x80000000
339: #define Log2P 1
340: #define Tiny0 0
341: #define Tiny1 1
342: #define Quick_max 14
343: #define Int_max 14
344:
345: #ifndef Flt_Rounds
346: #ifdef FLT_ROUNDS
347: #define Flt_Rounds FLT_ROUNDS
348: #else
349: #define Flt_Rounds 1
350: #endif
351: #endif /*Flt_Rounds*/
352:
353: #else /* ifndef IEEE_Arith */
354: #undef Sudden_Underflow
355: #define Sudden_Underflow
356: #ifdef IBM
357: #undef Flt_Rounds
358: #define Flt_Rounds 0
359: #define Exp_shift 24
360: #define Exp_shift1 24
361: #define Exp_msk1 0x1000000
362: #define Exp_msk11 0x1000000
363: #define Exp_mask 0x7f000000
364: #define P 14
365: #define Bias 65
366: #define Exp_1 0x41000000
367: #define Exp_11 0x41000000
368: #define Ebits 8 /* exponent has 7 bits, but 8 is the right value in b2d */
369: #define Frac_mask 0xffffff
370: #define Frac_mask1 0xffffff
371: #define Bletch 4
372: #define Ten_pmax 22
373: #define Bndry_mask 0xefffff
374: #define Bndry_mask1 0xffffff
375: #define LSB 1
376: #define Sign_bit 0x80000000
377: #define Log2P 4
378: #define Tiny0 0x100000
379: #define Tiny1 0
380: #define Quick_max 14
381: #define Int_max 15
382: #else /* VAX */
383: #undef Flt_Rounds
384: #define Flt_Rounds 1
385: #define Exp_shift 23
386: #define Exp_shift1 7
387: #define Exp_msk1 0x80
388: #define Exp_msk11 0x800000
389: #define Exp_mask 0x7f80
390: #define P 56
391: #define Bias 129
392: #define Exp_1 0x40800000
393: #define Exp_11 0x4080
394: #define Ebits 8
395: #define Frac_mask 0x7fffff
396: #define Frac_mask1 0xffff007f
397: #define Ten_pmax 24
398: #define Bletch 2
399: #define Bndry_mask 0xffff007f
400: #define Bndry_mask1 0xffff007f
401: #define LSB 0x10000
402: #define Sign_bit 0x8000
403: #define Log2P 1
404: #define Tiny0 0x80
405: #define Tiny1 0
406: #define Quick_max 15
407: #define Int_max 15
408: #endif /* IBM, VAX */
409: #endif /* IEEE_Arith */
410:
411: #ifndef IEEE_Arith
412: #define ROUND_BIASED
413: #endif
414:
415: #ifdef RND_PRODQUOT
416: #define rounded_product(a,b) a = rnd_prod(a, b)
417: #define rounded_quotient(a,b) a = rnd_quot(a, b)
418: #ifdef KR_headers
419: extern double rnd_prod(), rnd_quot();
420: #else
421: extern double rnd_prod(double, double), rnd_quot(double, double);
422: #endif
423: #else
424: #define rounded_product(a,b) a *= b
425: #define rounded_quotient(a,b) a /= b
426: #endif
427:
428: #define Big0 (Frac_mask1 | Exp_msk1*(DBL_MAX_EXP+Bias-1))
429: #define Big1 0xffffffff
430:
431: #undef Pack_16
432: #ifndef Pack_32
433: #define Pack_32
434: #endif
435:
436: #ifdef NO_LONG_LONG
437: #undef ULLong
438: #ifdef Just_16
439: #undef Pack_32
440: #define Pack_16
441: /* When Pack_32 is not defined, we store 16 bits per 32-bit Long.
442: * This makes some inner loops simpler and sometimes saves work
443: * during multiplications, but it often seems to make things slightly
444: * slower. Hence the default is now to store 32 bits per Long.
445: */
446: #endif
447: #else /* long long available */
448: #ifndef Llong
449: #define Llong long long
450: #endif
451: #ifndef ULLong
452: #define ULLong unsigned Llong
453: #endif
454: #endif /* NO_LONG_LONG */
455:
456: #ifdef Pack_32
457: #define ULbits 32
458: #define kshift 5
459: #define kmask 31
460: #define ALL_ON 0xffffffff
461: #else
462: #define ULbits 16
463: #define kshift 4
464: #define kmask 15
465: #define ALL_ON 0xffff
466: #endif
467:
468: #ifndef MULTIPLE_THREADS
469: #define ACQUIRE_DTOA_LOCK(n) /*nothing*/
470: #define FREE_DTOA_LOCK(n) /*nothing*/
1.2 kleink 471: #else
472: #include "reentrant.h"
473:
474: extern mutex_t __gdtoa_locks[2];
475:
476: #define ACQUIRE_DTOA_LOCK(n) \
477: do { \
478: if (__isthreaded) \
479: mutex_lock(&__gdtoa_locks[n]); \
480: } while (/* CONSTCOND */ 0)
481: #define FREE_DTOA_LOCK(n) \
482: do { \
483: if (__isthreaded) \
484: mutex_unlock(&__gdtoa_locks[n]); \
485: } while (/* CONSTCOND */ 0)
1.1 kleink 486: #endif
487:
488: #define Kmax 15
489:
490: struct
491: Bigint {
492: struct Bigint *next;
493: int k, maxwds, sign, wds;
494: ULong x[1];
495: };
496:
497: typedef struct Bigint Bigint;
498:
499: #ifdef NO_STRING_H
500: #ifdef DECLARE_SIZE_T
501: typedef unsigned int size_t;
502: #endif
503: extern void memcpy_D2A ANSI((void*, const void*, size_t));
504: #define Bcopy(x,y) memcpy_D2A(&x->sign,&y->sign,y->wds*sizeof(ULong) + 2*sizeof(int))
505: #else /* !NO_STRING_H */
506: #define Bcopy(x,y) memcpy(&x->sign,&y->sign,y->wds*sizeof(ULong) + 2*sizeof(int))
507: #endif /* NO_STRING_H */
508:
1.2 kleink 509: #define Balloc __Balloc_D2A
510: #define Bfree __Bfree_D2A
511: #define ULtoQ __ULtoQ_D2A
512: #define ULtof __ULtof_D2A
513: #define ULtod __ULtod_D2A
514: #define ULtodd __ULtodd_D2A
515: #define ULtox __ULtox_D2A
516: #define ULtoxL __ULtoxL_D2A
517: #define any_on __any_on_D2A
518: #define b2d __b2d_D2A
519: #define bigtens __bigtens_D2A
520: #define cmp __cmp_D2A
521: #define copybits __copybits_D2A
522: #define d2b __d2b_D2A
523: #define decrement __decrement_D2A
524: #define diff __diff_D2A
525: #define dtoa_result __dtoa_result_D2A
526: #define g__fmt __g__fmt_D2A
527: #define gethex __gethex_D2A
528: #define hexdig __hexdig_D2A
529: #define hexdig_init_D2A __hexdig_init_D2A
530: #define hexnan __hexnan_D2A
531: #define hi0bits __hi0bits_D2A
532: #define hi0bits_D2A __hi0bits_D2A
533: #define i2b __i2b_D2A
534: #define increment __increment_D2A
535: #define lo0bits __lo0bits_D2A
536: #define lshift __lshift_D2A
537: #define match __match_D2A
538: #define mult __mult_D2A
539: #define multadd __multadd_D2A
540: #define nrv_alloc __nrv_alloc_D2A
541: #define pow5mult __pow5mult_D2A
542: #define quorem __quorem_D2A
543: #define ratio __ratio_D2A
544: #define rshift __rshift_D2A
545: #define rv_alloc __rv_alloc_D2A
546: #define s2b __s2b_D2A
547: #define set_ones __set_ones_D2A
548: #define strcp __strcp_D2A
549: #define strcp_D2A __strcp_D2A
550: #define strtoIg __strtoIg_D2A
551: #define sum __sum_D2A
552: #define tens __tens_D2A
553: #define tinytens __tinytens_D2A
554: #define tinytens __tinytens_D2A
555: #define trailz __trailz_D2A
556: #define ulp __ulp_D2A
1.1 kleink 557:
558: extern char *dtoa_result;
559: extern CONST double bigtens[], tens[], tinytens[];
560: extern unsigned char hexdig[];
561:
562: extern Bigint *Balloc ANSI((int));
563: extern void Bfree ANSI((Bigint*));
564: extern void ULtof ANSI((ULong*, ULong*, Long, int));
565: extern void ULtod ANSI((ULong*, ULong*, Long, int));
566: extern void ULtodd ANSI((ULong*, ULong*, Long, int));
567: extern void ULtoQ ANSI((ULong*, ULong*, Long, int));
568: extern void ULtox ANSI((UShort*, ULong*, Long, int));
569: extern void ULtoxL ANSI((ULong*, ULong*, Long, int));
570: extern ULong any_on ANSI((Bigint*, int));
571: extern double b2d ANSI((Bigint*, int*));
572: extern int cmp ANSI((Bigint*, Bigint*));
573: extern void copybits ANSI((ULong*, int, Bigint*));
574: extern Bigint *d2b ANSI((double, int*, int*));
575: extern int decrement ANSI((Bigint*));
576: extern Bigint *diff ANSI((Bigint*, Bigint*));
577: extern char *dtoa ANSI((double d, int mode, int ndigits,
578: int *decpt, int *sign, char **rve));
579: extern char *g__fmt ANSI((char*, char*, char*, int, ULong));
1.3 ! kleink 580: extern int gethex ANSI((CONST char**, CONST FPI*, Long*, Bigint**, int));
1.1 kleink 581: extern void hexdig_init_D2A(Void);
1.3 ! kleink 582: extern int hexnan ANSI((CONST char**, CONST FPI*, ULong*));
1.1 kleink 583: extern int hi0bits_D2A ANSI((ULong));
584: extern Bigint *i2b ANSI((int));
585: extern Bigint *increment ANSI((Bigint*));
586: extern int lo0bits ANSI((ULong*));
587: extern Bigint *lshift ANSI((Bigint*, int));
1.2 kleink 588: extern int match ANSI((CONST char**, CONST char*));
1.1 kleink 589: extern Bigint *mult ANSI((Bigint*, Bigint*));
590: extern Bigint *multadd ANSI((Bigint*, int, int));
1.2 kleink 591: extern char *nrv_alloc ANSI((CONST char*, char **, int));
1.1 kleink 592: extern Bigint *pow5mult ANSI((Bigint*, int));
593: extern int quorem ANSI((Bigint*, Bigint*));
594: extern double ratio ANSI((Bigint*, Bigint*));
595: extern void rshift ANSI((Bigint*, int));
596: extern char *rv_alloc ANSI((int));
597: extern Bigint *s2b ANSI((CONST char*, int, int, ULong));
598: extern Bigint *set_ones ANSI((Bigint*, int));
599: extern char *strcp ANSI((char*, const char*));
600: extern int strtoIg ANSI((CONST char*, char**, FPI*, Long*, Bigint**, int*));
601: extern double strtod ANSI((const char *s00, char **se));
602: extern Bigint *sum ANSI((Bigint*, Bigint*));
1.3 ! kleink 603: extern int trailz ANSI((CONST Bigint*));
1.1 kleink 604: extern double ulp ANSI((double));
605:
606: #ifdef __cplusplus
607: }
608: #endif
609: /*
610: * NAN_WORD0 and NAN_WORD1 are only referenced in strtod.c. Prior to
611: * 20050115, they used to be hard-wired here (to 0x7ff80000 and 0,
612: * respectively), but now are determined by compiling and running
613: * qnan.c to generate gd_qnan.h, which specifies d_QNAN0 and d_QNAN1.
614: * Formerly gdtoaimp.h recommended supplying suitable -DNAN_WORD0=...
615: * and -DNAN_WORD1=... values if necessary. This should still work.
616: * (On HP Series 700/800 machines, -DNAN_WORD0=0x7ff40000 works.)
617: */
618: #ifdef IEEE_Arith
1.2 kleink 619: #ifdef IEEE_BIG_ENDIAN
1.1 kleink 620: #define _0 0
621: #define _1 1
622: #ifndef NAN_WORD0
623: #define NAN_WORD0 d_QNAN0
624: #endif
625: #ifndef NAN_WORD1
626: #define NAN_WORD1 d_QNAN1
627: #endif
628: #else
629: #define _0 1
630: #define _1 0
631: #ifndef NAN_WORD0
632: #define NAN_WORD0 d_QNAN1
633: #endif
634: #ifndef NAN_WORD1
635: #define NAN_WORD1 d_QNAN0
636: #endif
637: #endif
638: #else
639: #undef INFNAN_CHECK
640: #endif
641:
642: #undef SI
643: #ifdef Sudden_Underflow
644: #define SI 1
645: #else
646: #define SI 0
647: #endif
648:
649: #endif /* GDTOAIMP_H_INCLUDED */
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