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7799b7b3 | 1 | /* Compute sine and cosine of argument. |
688903eb | 2 | Copyright (C) 1997-2018 Free Software Foundation, Inc. |
7799b7b3 UD |
3 | This file is part of the GNU C Library. |
4 | Contributed by Ulrich Drepper <drepper@cygnus.com>, 1997. | |
5 | ||
6 | The GNU C Library is free software; you can redistribute it and/or | |
41bdb6e2 AJ |
7 | modify it under the terms of the GNU Lesser General Public |
8 | License as published by the Free Software Foundation; either | |
9 | version 2.1 of the License, or (at your option) any later version. | |
7799b7b3 UD |
10 | |
11 | The GNU C Library is distributed in the hope that it will be useful, | |
12 | but WITHOUT ANY WARRANTY; without even the implied warranty of | |
13 | MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU | |
41bdb6e2 | 14 | Lesser General Public License for more details. |
7799b7b3 | 15 | |
41bdb6e2 | 16 | You should have received a copy of the GNU Lesser General Public |
59ba27a6 PE |
17 | License along with the GNU C Library; if not, see |
18 | <http://www.gnu.org/licenses/>. */ | |
7799b7b3 | 19 | |
d435569c | 20 | #include <errno.h> |
7799b7b3 UD |
21 | #include <math.h> |
22 | ||
1ed0291c | 23 | #include <math_private.h> |
86f9568a | 24 | #include <libm-alias-ldouble.h> |
7799b7b3 UD |
25 | |
26 | ||
27 | void | |
28 | __sincosl (long double x, long double *sinx, long double *cosx) | |
29 | { | |
31035e80 | 30 | int32_t se, i0, i1 __attribute__ ((unused)); |
7799b7b3 UD |
31 | |
32 | /* High word of x. */ | |
33 | GET_LDOUBLE_WORDS (se, i0, i1, x); | |
34 | ||
35 | /* |x| ~< pi/4 */ | |
36 | se &= 0x7fff; | |
37 | if (se < 0x3ffe || (se == 0x3ffe && i0 <= 0xc90fdaa2)) | |
38 | { | |
39 | *sinx = __kernel_sinl (x, 0.0, 0); | |
40 | *cosx = __kernel_cosl (x, 0.0); | |
41 | } | |
cc3fa755 | 42 | else if (se == 0x7fff) |
7799b7b3 UD |
43 | { |
44 | /* sin(Inf or NaN) is NaN */ | |
45 | *sinx = *cosx = x - x; | |
fe8c2b33 | 46 | if (isinf (x)) |
d435569c | 47 | __set_errno (EDOM); |
7799b7b3 UD |
48 | } |
49 | else | |
50 | { | |
51 | /* Argument reduction needed. */ | |
52 | long double y[2]; | |
53 | int n; | |
54 | ||
55 | n = __ieee754_rem_pio2l (x, y); | |
56 | switch (n & 3) | |
57 | { | |
58 | case 0: | |
59 | *sinx = __kernel_sinl (y[0], y[1], 1); | |
60 | *cosx = __kernel_cosl (y[0], y[1]); | |
61 | break; | |
62 | case 1: | |
63 | *sinx = __kernel_cosl (y[0], y[1]); | |
64 | *cosx = -__kernel_sinl (y[0], y[1], 1); | |
65 | break; | |
66 | case 2: | |
67 | *sinx = -__kernel_sinl (y[0], y[1], 1); | |
68 | *cosx = -__kernel_cosl (y[0], y[1]); | |
69 | break; | |
70 | default: | |
71 | *sinx = -__kernel_cosl (y[0], y[1]); | |
72 | *cosx = __kernel_sinl (y[0], y[1], 1); | |
73 | break; | |
74 | } | |
75 | } | |
76 | } | |
86f9568a | 77 | libm_alias_ldouble (__sincos, sincos) |