| /* Compute sine and cosine of argument. |
| Copyright (C) 1997-2018 Free Software Foundation, Inc. |
| This file is part of the GNU C Library. |
| Contributed by Ulrich Drepper <drepper@cygnus.com>, 1997. |
| |
| The GNU C Library is free software; you can redistribute it and/or |
| modify it under the terms of the GNU Lesser General Public |
| License as published by the Free Software Foundation; either |
| version 2.1 of the License, or (at your option) any later version. |
| |
| The GNU C Library is distributed in the hope that it will be useful, |
| but WITHOUT ANY WARRANTY; without even the implied warranty of |
| MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU |
| Lesser General Public License for more details. |
| |
| You should have received a copy of the GNU Lesser General Public |
| License along with the GNU C Library; if not, see |
| <http://www.gnu.org/licenses/>. */ |
| |
| #include <errno.h> |
| #include <math.h> |
| |
| #include <math_private.h> |
| #include <libm-alias-double.h> |
| |
| #define IN_SINCOS |
| #include "s_sin.c" |
| |
| void |
| __sincos (double x, double *sinx, double *cosx) |
| { |
| mynumber u; |
| int k; |
| |
| SET_RESTORE_ROUND_53BIT (FE_TONEAREST); |
| |
| u.x = x; |
| k = u.i[HIGH_HALF] & 0x7fffffff; |
| |
| if (k < 0x400368fd) |
| { |
| double a, da, y; |
| /* |x| < 2^-27 => cos (x) = 1, sin (x) = x. */ |
| if (k < 0x3e400000) |
| { |
| if (k < 0x3e500000) |
| math_check_force_underflow (x); |
| *sinx = x; |
| *cosx = 1.0; |
| return; |
| } |
| /* |x| < 0.855469. */ |
| else if (k < 0x3feb6000) |
| { |
| *sinx = do_sin (x, 0); |
| *cosx = do_cos (x, 0); |
| return; |
| } |
| |
| /* |x| < 2.426265. */ |
| y = hp0 - fabs (x); |
| a = y + hp1; |
| da = (y - a) + hp1; |
| *sinx = __copysign (do_cos (a, da), x); |
| *cosx = do_sin (a, da); |
| return; |
| } |
| /* |x| < 2^1024. */ |
| if (k < 0x7ff00000) |
| { |
| double a, da, xx; |
| unsigned int n; |
| |
| /* If |x| < 105414350 use simple range reduction. */ |
| n = k < 0x419921FB ? reduce_sincos (x, &a, &da) : __branred (x, &a, &da); |
| n = n & 3; |
| |
| if (n == 1 || n == 2) |
| { |
| a = -a; |
| da = -da; |
| } |
| |
| if (n & 1) |
| { |
| double *temp = cosx; |
| cosx = sinx; |
| sinx = temp; |
| } |
| |
| *sinx = do_sin (a, da); |
| xx = do_cos (a, da); |
| *cosx = (n & 2) ? -xx : xx; |
| return; |
| } |
| |
| if (isinf (x)) |
| __set_errno (EDOM); |
| |
| *sinx = *cosx = x / x; |
| } |
| libm_alias_double (__sincos, sincos) |
