1 /*-
2 * Copyright (c) 2007 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
27
28 #if LDBL_MANT_DIG == 64
29 #include "../ld80/e_rem_pio2l.h"
30 #elif LDBL_MANT_DIG == 113
31 #include "../ld128/e_rem_pio2l.h"
32 #else
33 #error "Unsupported long double format"
34 #endif
35
36 long double
sinl(long double x)37 sinl(long double x)
38 {
39 union IEEEl2bits z;
40 int e0, s;
41 long double y[2];
42 long double hi, lo;
43
44 z.e = x;
45 s = z.bits.sign;
46 z.bits.sign = 0;
47
48 /* If x = +-0 or x is a subnormal number, then sin(x) = x */
49 if (z.bits.exp == 0) {
50 if (x != 0.0L)
51 __math_set_inexactl();
52 return (x);
53 }
54
55 /* If x = NaN or Inf, then sin(x) = NaN. */
56 if (z.bits.exp == 32767)
57 return __math_invalidl(x);
58
59 /* Optimize the case where x is already within range. */
60 if (z.e < _M_PI_4L) {
61 hi = __kernel_sinl(z.e, 0, 0);
62 return (s ? -hi : hi);
63 }
64
65 e0 = __ieee754_rem_pio2l(x, y);
66 hi = y[0];
67 lo = y[1];
68
69 switch (e0 & 3) {
70 case 0:
71 hi = __kernel_sinl(hi, lo, 1);
72 break;
73 case 1:
74 hi = __kernel_cosl(hi, lo);
75 break;
76 case 2:
77 hi = - __kernel_sinl(hi, lo, 1);
78 break;
79 case 3:
80 hi = - __kernel_cosl(hi, lo);
81 break;
82 }
83
84 return (hi);
85 }
86
87 #if defined(_HAVE_ALIAS_ATTRIBUTE)
88 #ifndef __clang__
89 #pragma GCC diagnostic ignored "-Wmissing-attributes"
90 #endif
91 __strong_reference(sinl, _sinl);
92 #endif
93
94
