1 | /* Compute sine and cosine of argument. |
2 | Copyright (C) 1997-2022 Free Software Foundation, Inc. |
3 | This file is part of the GNU C Library. |
4 | |
5 | The GNU C Library is free software; you can redistribute it and/or |
6 | modify it under the terms of the GNU Lesser General Public |
7 | License as published by the Free Software Foundation; either |
8 | version 2.1 of the License, or (at your option) any later version. |
9 | |
10 | The GNU C Library is distributed in the hope that it will be useful, |
11 | but WITHOUT ANY WARRANTY; without even the implied warranty of |
12 | MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU |
13 | Lesser General Public License for more details. |
14 | |
15 | You should have received a copy of the GNU Lesser General Public |
16 | License along with the GNU C Library; if not, see |
17 | <https://www.gnu.org/licenses/>. */ |
18 | |
19 | #include <errno.h> |
20 | #include <math.h> |
21 | |
22 | #include <math_private.h> |
23 | #include <math_ldbl_opt.h> |
24 | |
25 | void |
26 | __sincosl (long double x, long double *sinx, long double *cosx) |
27 | { |
28 | int64_t ix; |
29 | double xhi; |
30 | |
31 | /* High word of x. */ |
32 | xhi = ldbl_high (x); |
33 | EXTRACT_WORDS64 (ix, xhi); |
34 | |
35 | /* |x| ~< pi/4 */ |
36 | ix &= 0x7fffffffffffffffLL; |
37 | if (ix <= 0x3fe921fb54442d10LL) |
38 | __kernel_sincosl (x, 0.0L, sinx, cosx, 0); |
39 | else if (ix >= 0x7ff0000000000000LL) |
40 | { |
41 | /* sin(Inf or NaN) is NaN */ |
42 | *sinx = *cosx = x - x; |
43 | if (isinf (x)) |
44 | __set_errno (EDOM); |
45 | } |
46 | else |
47 | { |
48 | /* Argument reduction needed. */ |
49 | long double y[2]; |
50 | int n; |
51 | |
52 | n = __ieee754_rem_pio2l (x, y); |
53 | switch (n & 3) |
54 | { |
55 | case 0: |
56 | __kernel_sincosl (y[0], y[1], sinx, cosx, 1); |
57 | break; |
58 | case 1: |
59 | __kernel_sincosl (y[0], y[1], cosx, sinx, 1); |
60 | *cosx = -*cosx; |
61 | break; |
62 | case 2: |
63 | __kernel_sincosl (y[0], y[1], sinx, cosx, 1); |
64 | *sinx = -*sinx; |
65 | *cosx = -*cosx; |
66 | break; |
67 | default: |
68 | __kernel_sincosl (y[0], y[1], cosx, sinx, 1); |
69 | *sinx = -*sinx; |
70 | break; |
71 | } |
72 | } |
73 | } |
74 | long_double_symbol (libm, __sincosl, sincosl); |
75 | |