[apple/libc.git] / gdtoa / gdtoa-strtopdd-fbsd.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) 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;
	FPI *fpi = &fpi0, fpi1;
#ifdef Honor_FLT_ROUNDS
	int rounding = Flt_Rounds;
#endif

#ifdef Honor_FLT_ROUNDS
	if (rounding != fpi0.rounding) {
		fpi1 = fpi0; /* for thread safety */
		fpi1.rounding = rounding;
		fpi = &fpi1;
		}
#endif /* Honor_FLT_ROUNDS */
	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__ */
#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
224c7076 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
	32	#include "xlocale_private.h"
	33
	34	#include "gdtoaimp.h"
	35
	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
	46	int
	47	#ifdef KR_headers
	48	strtopdd(s, sp, dd) CONST char s; char sp; double dd; locale_t loc;
	49	#else
	50	strtopdd(CONST char s, char sp, double dd, locale_t loc)
	51	#endif
	52	{
	53	#ifdef Sudden_Underflow
	54	static FPI fpi0 = { 106, 1-1023, 2046-1023-106+1, 1, 1 };
	55	#else
	56	static FPI fpi0 = { 106, 1-1023-53+1, 2046-1023-106+1, 1, 0 };
	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];
	64	#ifdef __APPLE__
65	long double ld;
66	#endif /* __APPLE__ */
67	} U;
68	U *u;
69	FPI *fpi = &fpi0, fpi1;
70	#ifdef Honor_FLT_ROUNDS
71	int rounding = Flt_Rounds;
72	#endif
73
74	#ifdef Honor_FLT_ROUNDS
75	if (rounding != fpi0.rounding) {
76	fpi1 = fpi0; /* for thread safety */
77	fpi1.rounding = rounding;
78	fpi = &fpi1;
79	}
80	#endif /* Honor_FLT_ROUNDS */
81	rv = strtodg(s, sp, fpi, &exp, bits, loc);
82	u = (U*)dd;
83	switch(rv & STRTOG_Retmask) {
84	case STRTOG_NoNumber:
85	u->d[0] = u->d[1] = 0.;
86	return rv; // avoid setting sign
87
88	case STRTOG_Zero:
89	u->d[0] = u->d[1] = 0.;
90	break;
91
92	case STRTOG_Normal:
93	u->L[_1] = (bits[1] >> 21 \| bits[2] << 11) & 0xffffffffL;
94	u->L[_0] = bits[2] >> 21 \| bits[3] << 11 & 0xfffff
95	\| exp + 0x3ff + 105 << 20;
96	exp += 0x3ff + 52;
97	if (bits[1] &= 0x1fffff) {
98	i = hi0bits(bits[1]) - 11;
99	if (i >= exp) {
100	i = exp - 1;
101	exp = 0;
102	}
103	else
104	exp -= i;
105	if (i > 0) {
106	bits[1] = bits[1] << i \| bits[0] >> 32-i;
107	bits[0] = bits[0] << i & 0xffffffffL;
108	}
109	}
110	else if (bits[0]) {
111	i = hi0bits(bits[0]) + 21;
112	if (i >= exp) {
113	i = exp - 1;
114	exp = 0;
115	}
116	else
117	exp -= i;
118	if (i < 32) {
119	bits[1] = bits[0] >> 32 - i;
120	bits[0] = bits[0] << i & 0xffffffffL;
121	}
122	else {
123	bits[1] = bits[0] << i - 32;
124	bits[0] = 0;
125	}
126	}
127	else {
128	u->L[2] = u->L[3] = 0;
129	break;
130	}
131	u->L[2+_1] = bits[0];
132	u->L[2+_0] = bits[1] & 0xfffff \| exp << 20;
133	#ifdef __APPLE__
134	fixLDBL(u->ld);
135	#endif /* __APPLE__ */
136	break;
137
138	case STRTOG_Denormal:
139	if (bits[3])
140	goto nearly_normal;
141	if (bits[2])
142	goto partly_normal;
143	if (bits[1] & 0xffe00000)
144	goto hardly_normal;
145	/* completely denormal */
146	u->L[2] = u->L[3] = 0;
147	u->L[_1] = bits[0];
148	u->L[_0] = bits[1];
149	break;
150
151	nearly_normal:
152	i = hi0bits(bits[3]) - 11; /* i >= 12 */
153	j = 32 - i;
154	u->L[_0] = (bits[3] << i \| bits[2] >> j) & 0xfffff
155	\| 65 - i << 20;
156	u->L[_1] = (bits[2] << i \| bits[1] >> j) & 0xffffffffL;
157	u->L[2+_0] = bits[1] & (1L << j) - 1;
158	u->L[2+_1] = bits[0];
159	#ifdef __APPLE__
160	fixLDBL(u->ld);
161	#endif /* __APPLE__ */
162	break;
163
164	partly_normal:
165	i = hi0bits(bits[2]) - 11;
166	if (i < 0) {
167	j = -i;
168	i += 32;
169	u->L[_0] = bits[2] >> j & 0xfffff \| (33 + j) << 20;
170	u->L[_1] = (bits[2] << i \| bits[1] >> j) & 0xffffffffL;
171	u->L[2+_0] = bits[1] & (1L << j) - 1;
172	u->L[2+_1] = bits[0];
173	#ifdef __APPLE__
174	fixLDBL(u->ld);
175	#endif /* __APPLE__ */
176	break;
177	}
178	if (i == 0) {
179	u->L[_0] = bits[2] & 0xfffff \| 33 << 20;
180	u->L[_1] = bits[1];
181	u->L[2+_0] = 0;
182	u->L[2+_1] = bits[0];
183	#ifdef __APPLE__
184	fixLDBL(u->ld);
185	#endif /* __APPLE__ */
186	break;
187	}
188	j = 32 - i;
189	u->L[_0] = (bits[2] << i \| bits[1] >> j) & 0xfffff
190	\| j + 1 << 20;
191	u->L[_1] = (bits[1] << i \| bits[0] >> j) & 0xffffffffL;
192	u->L[2+_0] = 0;
193	u->L[2+_1] = bits[0] & (1L << j) - 1;
194	#ifdef __APPLE__
195	fixLDBL(u->ld);
196	#endif /* __APPLE__ */
197	break;
198
199	hardly_normal:
200	j = 11 - hi0bits(bits[1]);
201	i = 32 - j;
202	u->L[_0] = bits[1] >> j & 0xfffff \| j + 1 << 20;
203	u->L[_1] = (bits[1] << i \| bits[0] >> j) & 0xffffffffL;
204	u->L[2+_0] = 0;
205	u->L[2+_1] = bits[0] & (1L << j) - 1;
206	#ifdef __APPLE__
207	fixLDBL(u->ld);
208	#endif /* __APPLE__ */
209	break;
210
211	case STRTOG_Infinite:
212	#ifdef __APPLE__
213	u->L[_0] = 0x7ff00000;
214	u->L[_1] = u->L[2+_0] = u->L[2+_1] = 0;
215	#else /* __APPLE__ */
216	u->L[_0] = u->L[2+_0] = 0x7ff00000;
217	u->L[_1] = u->L[2+_1] = 0;
218	#endif /* __APPLE__ */
219	break;
220
221	case STRTOG_NaN:
222	#ifdef __APPLE__
223	u->L[0] = d_QNAN0;
224	u->L[1] = d_QNAN1;
225	u->L[2] = u->L[3] = 0;
226	#else /* __APPLE__ */
227	u->L[0] = u->L[2] = d_QNAN0;
228	u->L[1] = u->L[3] = d_QNAN1;
229	#endif /* __APPLE__ */
230	#ifdef __APPLE__
231	case STRTOG_NaNbits:
232	u->L[0] = d_QNAN0 \| ((bits[2] >> 20 \| bits[3] << 12) & 0xfffff);
233	u->L[1] = d_QNAN1 \| bits[1] >> 20 \| bits[2] << 12;
234	u->L[2] = u->L[3] = 0;
235	#endif /* __APPLE__ */
236	}
237	if (rv & STRTOG_Neg) {
238	u->L[ _0] \|= 0x80000000L;
239	#ifdef __APPLE__
240	u->L[2+_0] ^= 0x80000000L;
241	#else /* __APPLE__ */
242	u->L[2+_0] \|= 0x80000000L;
243	#endif /* __APPLE__ */
244	}
245	return rv;
246	}