sysdeps/ieee754/dbl-64/s_sincos.c

   1 /* Compute sine and cosine of argument.
   2    Copyright (C) 1997-2014 Free Software Foundation, Inc.
   3    This file is part of the GNU C Library.
   4    Contributed by Ulrich Drepper <drepper@cygnus.com>, 1997.
   5
   6    The GNU C Library is free software; you can redistribute it and/or
   7    modify it under the terms of the GNU Lesser General Public
   8    License as published by the Free Software Foundation; either
   9    version 2.1 of the License, or (at your option) any later version.
  10
  11    The GNU C Library is distributed in the hope that it will be useful,
  12    but WITHOUT ANY WARRANTY; without even the implied warranty of
  13    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  14    Lesser General Public License for more details.
  15
  16    You should have received a copy of the GNU Lesser General Public
  17    License along with the GNU C Library; if not, see
  18    <http://www.gnu.org/licenses/>.  */
  19
  20 #include <math.h>
  21
  22 #include <math_private.h>
  23
  24
  25 void
  26 __sincos (double x, double *sinx, double *cosx)
  27 {
  28   int32_t ix;
  29
  30   /* High word of x. */
  31   GET_HIGH_WORD (ix, x);
  32
  33   /* |x| ~< pi/4 */
  34   ix &= 0x7fffffff;
  35   if (ix >= 0x7ff00000)
  36     {
  37       /* sin(Inf or NaN) is NaN */
  38       *sinx = *cosx = x - x;
  39     }
  40   else
  41     {
  42       *sinx = __sin (x);
  43       *cosx = __cos (x);
  44     }
  45 }
  46 weak_alias (__sincos, sincos)
  47 #ifdef NO_LONG_DOUBLE
  48 strong_alias (__sincos, __sincosl)
  49 weak_alias (__sincos, sincosl)
  50 #endif