1 /* Compute sine and cosine of argument.
2 Copyright (C) 1997-2017 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, write to the Free
19 Software Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA
20 02111-1307 USA. */
21
22 #include <errno.h>
23 #include "quadmath-imp.h"
24
25 void
sincosq(__float128 x,__float128 * sinx,__float128 * cosx)26 sincosq (__float128 x, __float128 *sinx, __float128 *cosx)
27 {
28 int64_t ix;
29
30 /* High word of x. */
31 GET_FLT128_MSW64 (ix, x);
32
33 /* |x| ~< pi/4 */
34 ix &= 0x7fffffffffffffffLL;
35 if (ix <= 0x3ffe921fb54442d1LL)
36 __quadmath_kernel_sincosq (x, 0.0Q, sinx, cosx, 0);
37 else if (ix >= 0x7fff000000000000LL)
38 {
39 /* sin(Inf or NaN) is NaN */
40 *sinx = *cosx = x - x;
41 if (isinfq (x))
42 errno = EDOM;
43 }
44 else
45 {
46 /* Argument reduction needed. */
47 __float128 y[2];
48 int n;
49
50 n = __quadmath_rem_pio2q (x, y);
51 switch (n & 3)
52 {
53 case 0:
54 __quadmath_kernel_sincosq (y[0], y[1], sinx, cosx, 1);
55 break;
56 case 1:
57 __quadmath_kernel_sincosq (y[0], y[1], cosx, sinx, 1);
58 *cosx = -*cosx;
59 break;
60 case 2:
61 __quadmath_kernel_sincosq (y[0], y[1], sinx, cosx, 1);
62 *sinx = -*sinx;
63 *cosx = -*cosx;
64 break;
65 default:
66 __quadmath_kernel_sincosq (y[0], y[1], cosx, sinx, 1);
67 *sinx = -*sinx;
68 break;
69 }
70 }
71 }
72