1 /*-
2 * Copyright (c) 2007, 2010-2013 Steven G. Kargl
3 * All rights reserved.
4 *
5 * Redistribution and use in source and binary forms, with or without
6 * modification, are permitted provided that the following conditions
7 * are met:
8 * 1. Redistributions of source code must retain the above copyright
9 * notice unmodified, this list of conditions, and the following
10 * disclaimer.
11 * 2. Redistributions in binary form must reproduce the above copyright
12 * notice, this list of conditions and the following disclaimer in the
13 * documentation and/or other materials provided with the distribution.
14 *
15 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
16 * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
17 * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
18 * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
19 * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
20 * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
21 * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
22 * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
23 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
24 * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
25 *
26 * s_sinl.c and s_cosl.c merged by Steven G. Kargl.
27 */
28
29 #include <sys/cdefs.h>
30 #if 0
31 __FBSDID("$FreeBSD: head/lib/msun/src/s_sincosl.c 319047 2017-05-28 06:13:38Z mmel $");
32 #endif
33 #if defined(LIBM_SCCS) && !defined(lint)
34 __RCSID("$NetBSD: s_sincosl.c,v 1.4 2024/04/03 18:53:42 christos Exp $");
35 #endif
36
37 #include "namespace.h"
38 #include <float.h>
39
40 #include "math.h"
41 #include "math_private.h"
42
43 #ifdef __weak_alias
__weak_alias(sincosl,_sincosl)44 __weak_alias(sincosl,_sincosl)
45 #endif
46
47 #ifdef __HAVE_LONG_DOUBLE
48
49 #include "k_sincosl.h"
50
51 #if LDBL_MANT_DIG == 64
52 #include "../ld80/e_rem_pio2l.h"
53 #elif LDBL_MANT_DIG == 113
54 #include "../ld128/e_rem_pio2l.h"
55 #else
56 #error "Unsupported long double format"
57 #endif
58
59 void
60 sincosl(long double x, long double *sn, long double *cs)
61 {
62 union ieee_ext_u z;
63 int e0;
64 long double y[2];
65
66 z.extu_ld = x;
67 z.extu_sign = 0;
68
69 ENTERV();
70
71 /* Optimize the case where x is already within range. */
72 if (z.extu_ld < M_PI_4) {
73 /*
74 * If x = +-0 or x is a subnormal number, then sin(x) = x and
75 * cos(x) = 1.
76 */
77 if (z.extu_exp == 0) {
78 *sn = x;
79 *cs = 1;
80 } else
81 __kernel_sincosl(x, 0, 0, sn, cs);
82 RETURNV();
83 }
84
85 /* If x = NaN or Inf, then sin(x) and cos(x) are NaN. */
86 if (z.extu_exp == 32767) {
87 *sn = x - x;
88 *cs = x - x;
89 RETURNV();
90 }
91
92 /* Range reduction. */
93 e0 = __ieee754_rem_pio2l(x, y);
94
95 switch (e0 & 3) {
96 case 0:
97 __kernel_sincosl(y[0], y[1], 1, sn, cs);
98 break;
99 case 1:
100 __kernel_sincosl(y[0], y[1], 1, cs, sn);
101 *cs = -*cs;
102 break;
103 case 2:
104 __kernel_sincosl(y[0], y[1], 1, sn, cs);
105 *sn = -*sn;
106 *cs = -*cs;
107 break;
108 default:
109 __kernel_sincosl(y[0], y[1], 1, cs, sn);
110 *sn = -*sn;
111 }
112
113 RETURNV();
114 }
115
116 #else
117
118 void
119 sincosl(long double x, long double *sn, long double *cs)
120 {
121 double snn, css;
122 sincos(x, &snn, &css);
123 *sn = snn;
124 *cs = css;
125 }
126
127 #endif
128