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f964490f | 1 | /* Compute sine and cosine of argument. |
04277e02 | 2 | Copyright (C) 1997-2019 Free Software Foundation, Inc. |
f964490f RM |
3 | This file is part of the GNU C Library. |
4 | Contributed by Ulrich Drepper <drepper@cygnus.com>, 1997 and | |
5 | Jakub Jelinek <jj@ultra.linux.cz>. | |
6 | ||
7 | The GNU C Library is free software; you can redistribute it and/or | |
8 | modify it under the terms of the GNU Lesser General Public | |
9 | License as published by the Free Software Foundation; either | |
10 | version 2.1 of the License, or (at your option) any later version. | |
11 | ||
12 | The GNU C Library is distributed in the hope that it will be useful, | |
13 | but WITHOUT ANY WARRANTY; without even the implied warranty of | |
14 | MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU | |
15 | Lesser General Public License for more details. | |
16 | ||
17 | You should have received a copy of the GNU Lesser General Public | |
59ba27a6 | 18 | License along with the GNU C Library; if not, see |
5a82c748 | 19 | <https://www.gnu.org/licenses/>. */ |
f964490f | 20 | |
d435569c | 21 | #include <errno.h> |
f964490f RM |
22 | #include <math.h> |
23 | ||
1ed0291c | 24 | #include <math_private.h> |
f964490f RM |
25 | #include <math_ldbl_opt.h> |
26 | ||
27 | void | |
28 | __sincosl (long double x, long double *sinx, long double *cosx) | |
29 | { | |
30 | int64_t ix; | |
4ebd120c | 31 | double xhi; |
f964490f RM |
32 | |
33 | /* High word of x. */ | |
4ebd120c AM |
34 | xhi = ldbl_high (x); |
35 | EXTRACT_WORDS64 (ix, xhi); | |
f964490f RM |
36 | |
37 | /* |x| ~< pi/4 */ | |
38 | ix &= 0x7fffffffffffffffLL; | |
39 | if (ix <= 0x3fe921fb54442d10LL) | |
40 | __kernel_sincosl (x, 0.0L, sinx, cosx, 0); | |
41 | else if (ix >= 0x7ff0000000000000LL) | |
42 | { | |
43 | /* sin(Inf or NaN) is NaN */ | |
44 | *sinx = *cosx = x - x; | |
fe8c2b33 | 45 | if (isinf (x)) |
d435569c | 46 | __set_errno (EDOM); |
f964490f RM |
47 | } |
48 | else | |
49 | { | |
50 | /* Argument reduction needed. */ | |
51 | long double y[2]; | |
52 | int n; | |
53 | ||
54 | n = __ieee754_rem_pio2l (x, y); | |
55 | switch (n & 3) | |
56 | { | |
57 | case 0: | |
58 | __kernel_sincosl (y[0], y[1], sinx, cosx, 1); | |
59 | break; | |
60 | case 1: | |
61 | __kernel_sincosl (y[0], y[1], cosx, sinx, 1); | |
62 | *cosx = -*cosx; | |
63 | break; | |
64 | case 2: | |
65 | __kernel_sincosl (y[0], y[1], sinx, cosx, 1); | |
66 | *sinx = -*sinx; | |
67 | *cosx = -*cosx; | |
68 | break; | |
69 | default: | |
70 | __kernel_sincosl (y[0], y[1], cosx, sinx, 1); | |
71 | *sinx = -*sinx; | |
72 | break; | |
73 | } | |
74 | } | |
75 | } | |
76 | long_double_symbol (libm, __sincosl, sincosl); |