1/* Compute sine and cosine of argument.
2 Copyright (C) 1997-2023 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 <libm-alias-ldouble.h>
24
25void
26__sincosl (_Float128 x, _Float128 *sinx, _Float128 *cosx)
27{
28 int64_t ix;
29
30 /* High word of x. */
31 GET_LDOUBLE_MSW64 (ix, x);
32
33 /* |x| ~< pi/4 */
34 ix &= 0x7fffffffffffffffLL;
35 if (ix <= 0x3ffe921fb54442d1LL)
36 __kernel_sincosl (x, 0, sinx, cosx, 0);
37 else if (ix >= 0x7fff000000000000LL)
38 {
39 /* sin(Inf or NaN) is NaN */
40 *sinx = *cosx = x - x;
41 if (isinf (x))
42 __set_errno (EDOM);
43 }
44 else
45 {
46 /* Argument reduction needed. */
47 _Float128 y[2];
48 int n;
49
50 n = __ieee754_rem_pio2l (x, y);
51 switch (n & 3)
52 {
53 case 0:
54 __kernel_sincosl (y[0], y[1], sinx, cosx, 1);
55 break;
56 case 1:
57 __kernel_sincosl (y[0], y[1], cosx, sinx, 1);
58 *cosx = -*cosx;
59 break;
60 case 2:
61 __kernel_sincosl (y[0], y[1], sinx, cosx, 1);
62 *sinx = -*sinx;
63 *cosx = -*cosx;
64 break;
65 default:
66 __kernel_sincosl (y[0], y[1], cosx, sinx, 1);
67 *sinx = -*sinx;
68 break;
69 }
70 }
71}
72libm_alias_ldouble (__sincos, sincos)
73