1*627f7eb2Smrg /* Compute sine and cosine of argument.
2*627f7eb2Smrg Copyright (C) 1997-2018 Free Software Foundation, Inc.
3*627f7eb2Smrg This file is part of the GNU C Library.
4*627f7eb2Smrg Contributed by Ulrich Drepper <drepper@cygnus.com>, 1997 and
5*627f7eb2Smrg Jakub Jelinek <jj@ultra.linux.cz>.
6*627f7eb2Smrg
7*627f7eb2Smrg The GNU C Library is free software; you can redistribute it and/or
8*627f7eb2Smrg modify it under the terms of the GNU Lesser General Public
9*627f7eb2Smrg License as published by the Free Software Foundation; either
10*627f7eb2Smrg version 2.1 of the License, or (at your option) any later version.
11*627f7eb2Smrg
12*627f7eb2Smrg The GNU C Library is distributed in the hope that it will be useful,
13*627f7eb2Smrg but WITHOUT ANY WARRANTY; without even the implied warranty of
14*627f7eb2Smrg MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
15*627f7eb2Smrg Lesser General Public License for more details.
16*627f7eb2Smrg
17*627f7eb2Smrg You should have received a copy of the GNU Lesser General Public
18*627f7eb2Smrg License along with the GNU C Library; if not, see
19*627f7eb2Smrg <http://www.gnu.org/licenses/>. */
20*627f7eb2Smrg
21*627f7eb2Smrg #include "quadmath-imp.h"
22*627f7eb2Smrg
23*627f7eb2Smrg void
sincosq(__float128 x,__float128 * sinx,__float128 * cosx)24*627f7eb2Smrg sincosq (__float128 x, __float128 *sinx, __float128 *cosx)
25*627f7eb2Smrg {
26*627f7eb2Smrg int64_t ix;
27*627f7eb2Smrg
28*627f7eb2Smrg /* High word of x. */
29*627f7eb2Smrg GET_FLT128_MSW64 (ix, x);
30*627f7eb2Smrg
31*627f7eb2Smrg /* |x| ~< pi/4 */
32*627f7eb2Smrg ix &= 0x7fffffffffffffffLL;
33*627f7eb2Smrg if (ix <= 0x3ffe921fb54442d1LL)
34*627f7eb2Smrg __quadmath_kernel_sincosq (x, 0, sinx, cosx, 0);
35*627f7eb2Smrg else if (ix >= 0x7fff000000000000LL)
36*627f7eb2Smrg {
37*627f7eb2Smrg /* sin(Inf or NaN) is NaN */
38*627f7eb2Smrg *sinx = *cosx = x - x;
39*627f7eb2Smrg if (isinfq (x))
40*627f7eb2Smrg errno = EDOM;
41*627f7eb2Smrg }
42*627f7eb2Smrg else
43*627f7eb2Smrg {
44*627f7eb2Smrg /* Argument reduction needed. */
45*627f7eb2Smrg __float128 y[2];
46*627f7eb2Smrg int n;
47*627f7eb2Smrg
48*627f7eb2Smrg n = __quadmath_rem_pio2q (x, y);
49*627f7eb2Smrg switch (n & 3)
50*627f7eb2Smrg {
51*627f7eb2Smrg case 0:
52*627f7eb2Smrg __quadmath_kernel_sincosq (y[0], y[1], sinx, cosx, 1);
53*627f7eb2Smrg break;
54*627f7eb2Smrg case 1:
55*627f7eb2Smrg __quadmath_kernel_sincosq (y[0], y[1], cosx, sinx, 1);
56*627f7eb2Smrg *cosx = -*cosx;
57*627f7eb2Smrg break;
58*627f7eb2Smrg case 2:
59*627f7eb2Smrg __quadmath_kernel_sincosq (y[0], y[1], sinx, cosx, 1);
60*627f7eb2Smrg *sinx = -*sinx;
61*627f7eb2Smrg *cosx = -*cosx;
62*627f7eb2Smrg break;
63*627f7eb2Smrg default:
64*627f7eb2Smrg __quadmath_kernel_sincosq (y[0], y[1], cosx, sinx, 1);
65*627f7eb2Smrg *sinx = -*sinx;
66*627f7eb2Smrg break;
67*627f7eb2Smrg }
68*627f7eb2Smrg }
69*627f7eb2Smrg }
70