[apple/libc.git] / gdtoa / FreeBSD / gdtoa-strtopdd.c

/****************************************************************

The author of this software is David M. Gay.

Copyright (C) 1998, 2000 by Lucent Technologies
All Rights Reserved

Permission to use, copy, modify, and distribute this software and
its documentation for any purpose and without fee is hereby
granted, provided that the above copyright notice appear in all
copies and that both that the copyright notice and this
permission notice and warranty disclaimer appear in supporting
documentation, and that the name of Lucent or any of its entities
not be used in advertising or publicity pertaining to
distribution of the software without specific, written prior
permission.

LUCENT DISCLAIMS ALL WARRANTIES WITH REGARD TO THIS SOFTWARE,
INCLUDING ALL IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS.
IN NO EVENT SHALL LUCENT OR ANY OF ITS ENTITIES BE LIABLE FOR ANY
SPECIAL, INDIRECT OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER
IN AN ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION,
ARISING OUT OF OR IN CONNECTION WITH THE USE OR PERFORMANCE OF
THIS SOFTWARE.

****************************************************************/

/* Please send bug reports to David M. Gay (dmg at acm dot org,
 * with " at " changed at "@" and " dot " changed to ".").	*/

#include "xlocale_private.h"

#include "gdtoaimp.h"

#ifdef __APPLE__
/*
 * IEEE specifies that the most significant (head) double is required to
 * be equal to the long double rounded to the nearest double, so that means
 * the tail double might be the opposite sign as the head.  We can do this
 * adding (long double)0 to the number, which will fix it up.
 */
#define	fixLDBL(x)	((x) += 0.L)
#endif /* __APPLE__ */

 int
#ifdef KR_headers
strtopdd(s, sp, dd, loc) CONST char *s; char **sp; double *dd; locale_t loc;
#else
strtopdd(CONST char *s, char **sp, double *dd, locale_t loc)
#endif
{
#ifdef Sudden_Underflow
	static FPI fpi0 = { 106, 1-1023, 2046-1023-106+1, 1, 1 };
#else
	static FPI fpi0 = { 106, 1-1023-53+1, 2046-1023-106+1, 1, 0 };
#endif
	ULong bits[4];
	Long exp;
	int i, j, rv;
	typedef union {
		double d[2];
		ULong L[4];
#ifdef __APPLE__
		long double ld;
#endif /* __APPLE__ */
		} U;
	U *u;
#ifdef Honor_FLT_ROUNDS
#include "gdtoa_fltrnds.h"
#else
#define fpi &fpi0
#endif

	rv = strtodg(s, sp, fpi, &exp, bits, loc);
	u = (U*)dd;
	switch(rv & STRTOG_Retmask) {
	  case STRTOG_NoNumber:
		u->d[0] = u->d[1] = 0.;
		return rv; // avoid setting sign

	  case STRTOG_Zero:
		u->d[0] = u->d[1] = 0.;
		break;

	  case STRTOG_Normal:
		u->L[_1] = (bits[1] >> 21 | bits[2] << 11) & 0xffffffffL;
		u->L[_0] = (bits[2] >> 21) | ((bits[3] << 11) & 0xfffff)
			  | ((exp + 0x3ff + 105) << 20);
		exp += 0x3ff + 52;
		if (bits[1] &= 0x1fffff) {
			i = hi0bits(bits[1]) - 11;
			if (i >= exp) {
				i = exp - 1;
				exp = 0;
				}
			else
				exp -= i;
			if (i > 0) {
				bits[1] = bits[1] << i | bits[0] >> (32-i);
				bits[0] = bits[0] << i & 0xffffffffL;
				}
			}
		else if (bits[0]) {
			i = hi0bits(bits[0]) + 21;
			if (i >= exp) {
				i = exp - 1;
				exp = 0;
				}
			else
				exp -= i;
			if (i < 32) {
				bits[1] = bits[0] >> (32 - i);
				bits[0] = bits[0] << i & 0xffffffffL;
				}
			else {
				bits[1] = bits[0] << (i - 32);
				bits[0] = 0;
				}
			}
		else {
			u->L[2] = u->L[3] = 0;
			break;
			}
		u->L[2+_1] = bits[0];
		u->L[2+_0] = (bits[1] & 0xfffff) | (exp << 20);
#ifdef __APPLE__
		fixLDBL(u->ld);
#endif /* __APPLE__ */
		break;

	  case STRTOG_Denormal:
		if (bits[3])
			goto nearly_normal;
		if (bits[2])
			goto partly_normal;
		if (bits[1] & 0xffe00000)
			goto hardly_normal;
		/* completely denormal */
		u->L[2] = u->L[3] = 0;
		u->L[_1] = bits[0];
		u->L[_0] = bits[1];
		break;

	  nearly_normal:
		i = hi0bits(bits[3]) - 11;	/* i >= 12 */
		j = 32 - i;
		u->L[_0] = ((bits[3] << i | bits[2] >> j) & 0xfffff)
			| ((65 - i) << 20);
		u->L[_1] = (bits[2] << i | bits[1] >> j) & 0xffffffffL;
		u->L[2+_0] = bits[1] & ((1L << j) - 1);
		u->L[2+_1] = bits[0];
#ifdef __APPLE__
		fixLDBL(u->ld);
#endif /* __APPLE__ */
		break;

	  partly_normal:
		i = hi0bits(bits[2]) - 11;
		if (i < 0) {
			j = -i;
			i += 32;
			u->L[_0] = (bits[2] >> j & 0xfffff) | (33 + j) << 20;
			u->L[_1] = ((bits[2] << i) | (bits[1] >> j)) & 0xffffffffL;
			u->L[2+_0] = bits[1] & ((1L << j) - 1);
			u->L[2+_1] = bits[0];
#ifdef __APPLE__
			fixLDBL(u->ld);
#endif /* __APPLE__ */
			break;
			}
		if (i == 0) {
			u->L[_0] = (bits[2] & 0xfffff) | (33 << 20);
			u->L[_1] = bits[1];
			u->L[2+_0] = 0;
			u->L[2+_1] = bits[0];
#ifdef __APPLE__
			fixLDBL(u->ld);
#endif /* __APPLE__ */
			break;
			}
		j = 32 - i;
		u->L[_0] = (((bits[2] << i) | (bits[1] >> j)) & 0xfffff)
				| ((j + 1) << 20);
		u->L[_1] = (bits[1] << i | bits[0] >> j) & 0xffffffffL;
		u->L[2+_0] = 0;
		u->L[2+_1] = bits[0] & ((1L << j) - 1);
#ifdef __APPLE__
		fixLDBL(u->ld);
#endif /* __APPLE__ */
		break;

	  hardly_normal:
		j = 11 - hi0bits(bits[1]);
		i = 32 - j;
		u->L[_0] = (bits[1] >> j & 0xfffff) | ((j + 1) << 20);
		u->L[_1] = (bits[1] << i | bits[0] >> j) & 0xffffffffL;
		u->L[2+_0] = 0;
		u->L[2+_1] = bits[0] & ((1L << j) - 1);
#ifdef __APPLE__
		fixLDBL(u->ld);
#endif /* __APPLE__ */
		break;

	  case STRTOG_Infinite:
#ifdef __APPLE__
		u->L[_0] = 0x7ff00000;
		u->L[_1] = u->L[2+_0] = u->L[2+_1] = 0;
#else /* __APPLE__ */
		u->L[_0] = u->L[2+_0] = 0x7ff00000;
		u->L[_1] = u->L[2+_1] = 0;
#endif /* __APPLE__ */
		break;

	  case STRTOG_NaN:
#ifdef __APPLE__
		u->L[0] = d_QNAN0;
		u->L[1] = d_QNAN1;
		u->L[2] = u->L[3] = 0;
#else /* __APPLE__ */
		u->L[0] = u->L[2] = d_QNAN0;
		u->L[1] = u->L[3] = d_QNAN1;
#endif /* __APPLE__ */
		break;
#ifdef __APPLE__
	 case STRTOG_NaNbits:
		u->L[0] = d_QNAN0 | ((bits[2] >> 20 | bits[3] << 12) & 0xfffff);
		u->L[1] = d_QNAN1 | bits[1] >> 20 | bits[2] << 12;
		u->L[2] = u->L[3] = 0;
#endif /* __APPLE__ */
	  }
	if (rv & STRTOG_Neg) {
		u->L[  _0] |= 0x80000000L;
#ifdef __APPLE__
		u->L[2+_0] ^= 0x80000000L;
#else /* __APPLE__ */
		u->L[2+_0] |= 0x80000000L;
#endif /* __APPLE__ */
		}
	return rv;
	}
Commit	Line	Data
3d9156a7 A	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	/* Please send bug reports to David M. Gay (dmg at acm dot org,
	30	* with " at " changed at "@" and " dot " changed to "."). */
	31
ad3c9f2a A	32	#include "xlocale_private.h"
ad3c9f2a A	33
3d9156a7 A	34	#include "gdtoaimp.h"
3d9156a7 A	35
ad3c9f2a A	36	#ifdef __APPLE__
	37	/*
	38	* IEEE specifies that the most significant (head) double is required to
	39	* be equal to the long double rounded to the nearest double, so that means
	40	* the tail double might be the opposite sign as the head. We can do this
	41	* adding (long double)0 to the number, which will fix it up.
	42	*/
	43	#define fixLDBL(x) ((x) += 0.L)
	44	#endif /* __APPLE__ */
	45
3d9156a7 A	46	int
3d9156a7 A	47	#ifdef KR_headers
ad3c9f2a	48	strtopdd(s, sp, dd, loc) CONST char s; char sp; double dd; locale_t loc;
3d9156a7	49	#else
ad3c9f2a	50	strtopdd(CONST char s, char sp, double dd, locale_t loc)
3d9156a7 A	51	#endif
	52	{
	53	#ifdef Sudden_Underflow
34e8f829	54	static FPI fpi0 = { 106, 1-1023, 2046-1023-106+1, 1, 1 };
3d9156a7	55	#else
34e8f829	56	static FPI fpi0 = { 106, 1-1023-53+1, 2046-1023-106+1, 1, 0 };
3d9156a7 A	57	#endif
	58	ULong bits[4];
	59	Long exp;
	60	int i, j, rv;
	61	typedef union {
	62	double d[2];
	63	ULong L[4];
ad3c9f2a A	64	#ifdef __APPLE__
	65	long double ld;
	66	#endif /* __APPLE__ */
3d9156a7 A	67	} U;
3d9156a7 A	68	U *u;
34e8f829 A	69	#ifdef Honor_FLT_ROUNDS
	70	#include "gdtoa_fltrnds.h"
	71	#else
	72	#define fpi &fpi0
	73	#endif
3d9156a7	74
ad3c9f2a	75	rv = strtodg(s, sp, fpi, &exp, bits, loc);
3d9156a7 A	76	u = (U*)dd;
	77	switch(rv & STRTOG_Retmask) {
	78	case STRTOG_NoNumber:
ad3c9f2a A	79	u->d[0] = u->d[1] = 0.;
	80	return rv; // avoid setting sign
	81
3d9156a7 A	82	case STRTOG_Zero:
	83	u->d[0] = u->d[1] = 0.;
	84	break;
	85
	86	case STRTOG_Normal:
	87	u->L[_1] = (bits[1] >> 21 \| bits[2] << 11) & 0xffffffffL;
1f2f436a A	88	u->L[_0] = (bits[2] >> 21) \| ((bits[3] << 11) & 0xfffff)
1f2f436a A	89	\| ((exp + 0x3ff + 105) << 20);
3d9156a7 A	90	exp += 0x3ff + 52;
	91	if (bits[1] &= 0x1fffff) {
	92	i = hi0bits(bits[1]) - 11;
	93	if (i >= exp) {
	94	i = exp - 1;
	95	exp = 0;
	96	}
	97	else
	98	exp -= i;
	99	if (i > 0) {
1f2f436a	100	bits[1] = bits[1] << i \| bits[0] >> (32-i);
3d9156a7 A	101	bits[0] = bits[0] << i & 0xffffffffL;
	102	}
	103	}
	104	else if (bits[0]) {
	105	i = hi0bits(bits[0]) + 21;
	106	if (i >= exp) {
	107	i = exp - 1;
	108	exp = 0;
	109	}
	110	else
	111	exp -= i;
	112	if (i < 32) {
1f2f436a	113	bits[1] = bits[0] >> (32 - i);
3d9156a7 A	114	bits[0] = bits[0] << i & 0xffffffffL;
	115	}
	116	else {
1f2f436a	117	bits[1] = bits[0] << (i - 32);
3d9156a7 A	118	bits[0] = 0;
	119	}
	120	}
	121	else {
	122	u->L[2] = u->L[3] = 0;
	123	break;
	124	}
	125	u->L[2+_1] = bits[0];
1f2f436a	126	u->L[2+_0] = (bits[1] & 0xfffff) \| (exp << 20);
ad3c9f2a A	127	#ifdef __APPLE__
	128	fixLDBL(u->ld);
	129	#endif /* __APPLE__ */
3d9156a7 A	130	break;
	131
	132	case STRTOG_Denormal:
	133	if (bits[3])
	134	goto nearly_normal;
	135	if (bits[2])
	136	goto partly_normal;
	137	if (bits[1] & 0xffe00000)
	138	goto hardly_normal;
	139	/* completely denormal */
	140	u->L[2] = u->L[3] = 0;
	141	u->L[_1] = bits[0];
	142	u->L[_0] = bits[1];
	143	break;
	144
	145	nearly_normal:
	146	i = hi0bits(bits[3]) - 11; /* i >= 12 */
	147	j = 32 - i;
1f2f436a A	148	u->L[_0] = ((bits[3] << i \| bits[2] >> j) & 0xfffff)
1f2f436a A	149	\| ((65 - i) << 20);
3d9156a7	150	u->L[_1] = (bits[2] << i \| bits[1] >> j) & 0xffffffffL;
1f2f436a	151	u->L[2+_0] = bits[1] & ((1L << j) - 1);
3d9156a7	152	u->L[2+_1] = bits[0];
ad3c9f2a A	153	#ifdef __APPLE__
	154	fixLDBL(u->ld);
	155	#endif /* __APPLE__ */
3d9156a7 A	156	break;
	157
	158	partly_normal:
	159	i = hi0bits(bits[2]) - 11;
	160	if (i < 0) {
	161	j = -i;
	162	i += 32;
1f2f436a A	163	u->L[_0] = (bits[2] >> j & 0xfffff) \| (33 + j) << 20;
	164	u->L[_1] = ((bits[2] << i) \| (bits[1] >> j)) & 0xffffffffL;
	165	u->L[2+_0] = bits[1] & ((1L << j) - 1);
3d9156a7	166	u->L[2+_1] = bits[0];
ad3c9f2a A	167	#ifdef __APPLE__
	168	fixLDBL(u->ld);
	169	#endif /* __APPLE__ */
3d9156a7 A	170	break;
	171	}
	172	if (i == 0) {
1f2f436a	173	u->L[_0] = (bits[2] & 0xfffff) \| (33 << 20);
3d9156a7 A	174	u->L[_1] = bits[1];
	175	u->L[2+_0] = 0;
	176	u->L[2+_1] = bits[0];
ad3c9f2a A	177	#ifdef __APPLE__
	178	fixLDBL(u->ld);
	179	#endif /* __APPLE__ */
3d9156a7 A	180	break;
	181	}
	182	j = 32 - i;
1f2f436a A	183	u->L[_0] = (((bits[2] << i) \| (bits[1] >> j)) & 0xfffff)
1f2f436a A	184	\| ((j + 1) << 20);
3d9156a7 A	185	u->L[_1] = (bits[1] << i \| bits[0] >> j) & 0xffffffffL;
3d9156a7 A	186	u->L[2+_0] = 0;
1f2f436a	187	u->L[2+_1] = bits[0] & ((1L << j) - 1);
ad3c9f2a A	188	#ifdef __APPLE__
	189	fixLDBL(u->ld);
	190	#endif /* __APPLE__ */
3d9156a7 A	191	break;
	192
	193	hardly_normal:
	194	j = 11 - hi0bits(bits[1]);
	195	i = 32 - j;
1f2f436a	196	u->L[_0] = (bits[1] >> j & 0xfffff) \| ((j + 1) << 20);
3d9156a7 A	197	u->L[_1] = (bits[1] << i \| bits[0] >> j) & 0xffffffffL;
3d9156a7 A	198	u->L[2+_0] = 0;
1f2f436a	199	u->L[2+_1] = bits[0] & ((1L << j) - 1);
ad3c9f2a A	200	#ifdef __APPLE__
	201	fixLDBL(u->ld);
	202	#endif /* __APPLE__ */
3d9156a7 A	203	break;
	204
	205	case STRTOG_Infinite:
ad3c9f2a A	206	#ifdef __APPLE__
	207	u->L[_0] = 0x7ff00000;
	208	u->L[_1] = u->L[2+_0] = u->L[2+_1] = 0;
	209	#else /* __APPLE__ */
3d9156a7 A	210	u->L[_0] = u->L[2+_0] = 0x7ff00000;
3d9156a7 A	211	u->L[_1] = u->L[2+_1] = 0;
ad3c9f2a	212	#endif /* __APPLE__ */
3d9156a7 A	213	break;
	214
	215	case STRTOG_NaN:
ad3c9f2a A	216	#ifdef __APPLE__
	217	u->L[0] = d_QNAN0;
	218	u->L[1] = d_QNAN1;
	219	u->L[2] = u->L[3] = 0;
	220	#else /* __APPLE__ */
3d9156a7 A	221	u->L[0] = u->L[2] = d_QNAN0;
3d9156a7 A	222	u->L[1] = u->L[3] = d_QNAN1;
ad3c9f2a A	223	#endif /* __APPLE__ */
	224	break;
	225	#ifdef __APPLE__
	226	case STRTOG_NaNbits:
	227	u->L[0] = d_QNAN0 \| ((bits[2] >> 20 \| bits[3] << 12) & 0xfffff);
	228	u->L[1] = d_QNAN1 \| bits[1] >> 20 \| bits[2] << 12;
	229	u->L[2] = u->L[3] = 0;
	230	#endif /* __APPLE__ */
3d9156a7 A	231	}
	232	if (rv & STRTOG_Neg) {
	233	u->L[ _0] \|= 0x80000000L;
ad3c9f2a A	234	#ifdef __APPLE__
	235	u->L[2+_0] ^= 0x80000000L;
	236	#else /* __APPLE__ */
3d9156a7	237	u->L[2+_0] \|= 0x80000000L;
ad3c9f2a	238	#endif /* __APPLE__ */
3d9156a7 A	239	}
	240	return rv;
	241	}