1 /* Compute sine and cosine of argument.
2 Copyright (C) 1997, 1999 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 "quadmath-imp.h"
23
24 void
sincosq(__float128 x,__float128 * sinx,__float128 * cosx)25 sincosq (__float128 x, __float128 *sinx, __float128 *cosx)
26 {
27 int64_t ix;
28
29 /* High word of x. */
30 GET_FLT128_MSW64 (ix, x);
31
32 /* |x| ~< pi/4 */
33 ix &= 0x7fffffffffffffffLL;
34 if (ix <= 0x3ffe921fb54442d1LL)
35 __quadmath_kernel_sincosq (x, 0.0Q, sinx, cosx, 0);
36 else if (ix >= 0x7fff000000000000LL)
37 {
38 /* sin(Inf or NaN) is NaN */
39 *sinx = *cosx = x - x;
40 }
41 else
42 {
43 /* Argument reduction needed. */
44 __float128 y[2];
45 int n;
46
47 n = __quadmath_rem_pio2q (x, y);
48 switch (n & 3)
49 {
50 case 0:
51 __quadmath_kernel_sincosq (y[0], y[1], sinx, cosx, 1);
52 break;
53 case 1:
54 __quadmath_kernel_sincosq (y[0], y[1], cosx, sinx, 1);
55 *cosx = -*cosx;
56 break;
57 case 2:
58 __quadmath_kernel_sincosq (y[0], y[1], sinx, cosx, 1);
59 *sinx = -*sinx;
60 *cosx = -*cosx;
61 break;
62 default:
63 __quadmath_kernel_sincosq (y[0], y[1], cosx, sinx, 1);
64 *sinx = -*sinx;
65 break;
66 }
67 }
68 }
69