1/*	$NetBSD: s_sinl.c,v 1.3 2024/04/03 18:53:42 christos Exp $	*/
2
3/*-
4 * SPDX-License-Identifier: BSD-2-Clause
5 *
6 * Copyright (c) 2007 Steven G. Kargl
7 * All rights reserved.
8 *
9 * Redistribution and use in source and binary forms, with or without
10 * modification, are permitted provided that the following conditions
11 * are met:
12 * 1. Redistributions of source code must retain the above copyright
13 *    notice unmodified, this list of conditions, and the following
14 *    disclaimer.
15 * 2. Redistributions in binary form must reproduce the above copyright
16 *    notice, this list of conditions and the following disclaimer in the
17 *    documentation and/or other materials provided with the distribution.
18 *
19 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
20 * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
21 * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
22 * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
23 * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
24 * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
25 * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
26 * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
27 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
28 * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
29 */
30
31#include <sys/cdefs.h>
32__RCSID("$NetBSD: s_sinl.c,v 1.3 2024/04/03 18:53:42 christos Exp $");
33
34#include "namespace.h"
35#include <float.h>
36
37#ifdef __weak_alias
38__weak_alias(sinl, _sinl)
39#endif
40
41#include "math.h"
42#include "math_private.h"
43
44#ifdef __HAVE_LONG_DOUBLE
45
46#if LDBL_MANT_DIG == 64
47#include "../ld80/e_rem_pio2l.h"
48#include "../ld80/k_sinl.c"
49#elif LDBL_MANT_DIG == 113
50#include "../ld128/e_rem_pio2l.h"
51#include "../ld128/k_sinl.c"
52#else
53#error "Unsupported long double format"
54#endif
55
56long double
57sinl(long double x)
58{
59	union ieee_ext_u z;
60	int e0, s;
61	long double y[2];
62	long double hi, lo;
63
64	z.extu_ld = x;
65	s = z.extu_sign;
66	z.extu_sign = 0;
67
68	/* If x = +-0 or x is a subnormal number, then sin(x) = x */
69	if (z.extu_exp == 0)
70		return (x);
71
72	/* If x = NaN or Inf, then sin(x) = NaN. */
73	if (z.extu_exp == 32767)
74		return ((x - x) / (x - x));
75
76	ENTERI();
77
78	/* Optimize the case where x is already within range. */
79	if (z.extu_ld < M_PI_4) {
80		hi = __kernel_sinl(z.extu_ld, 0, 0);
81		RETURNI(s ? -hi : hi);
82	}
83
84	e0 = __ieee754_rem_pio2l(x, y);
85	hi = y[0];
86	lo = y[1];
87
88	switch (e0 & 3) {
89	case 0:
90	    hi = __kernel_sinl(hi, lo, 1);
91	    break;
92	case 1:
93	    hi = __kernel_cosl(hi, lo);
94	    break;
95	case 2:
96	    hi = - __kernel_sinl(hi, lo, 1);
97	    break;
98	case 3:
99	    hi = - __kernel_cosl(hi, lo);
100	    break;
101	}
102
103	RETURNI(hi);
104}
105
106#else
107
108long double
109sinl(long double x)
110{
111	return sin(x);
112}
113
114#endif /* __HAVE_LONG_DOUBLE */
115