1 /* Compute sine and cosine of argument.
2 Copyright (C) 1997-2018 Free Software Foundation, Inc.
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
18 License along with the GNU C Library; if not, see
19 <http://www.gnu.org/licenses/>. */
20
21 #include "quadmath-imp.h"
22
23 void
sincosq(__float128 x,__float128 * sinx,__float128 * cosx)24 sincosq (__float128 x, __float128 *sinx, __float128 *cosx)
25 {
26 int64_t ix;
27
28 /* High word of x. */
29 GET_FLT128_MSW64 (ix, x);
30
31 /* |x| ~< pi/4 */
32 ix &= 0x7fffffffffffffffLL;
33 if (ix <= 0x3ffe921fb54442d1LL)
34 __quadmath_kernel_sincosq (x, 0, sinx, cosx, 0);
35 else if (ix >= 0x7fff000000000000LL)
36 {
37 /* sin(Inf or NaN) is NaN */
38 *sinx = *cosx = x - x;
39 if (isinfq (x))
40 errno = EDOM;
41 }
42 else
43 {
44 /* Argument reduction needed. */
45 __float128 y[2];
46 int n;
47
48 n = __quadmath_rem_pio2q (x, y);
49 switch (n & 3)
50 {
51 case 0:
52 __quadmath_kernel_sincosq (y[0], y[1], sinx, cosx, 1);
53 break;
54 case 1:
55 __quadmath_kernel_sincosq (y[0], y[1], cosx, sinx, 1);
56 *cosx = -*cosx;
57 break;
58 case 2:
59 __quadmath_kernel_sincosq (y[0], y[1], sinx, cosx, 1);
60 *sinx = -*sinx;
61 *cosx = -*cosx;
62 break;
63 default:
64 __quadmath_kernel_sincosq (y[0], y[1], cosx, sinx, 1);
65 *sinx = -*sinx;
66 break;
67 }
68 }
69 }
70