sysdeps/ieee754/dbl-64/s_sincos.c

   1 /* Compute sine and cosine of argument.
   2    Copyright (C) 1997, 2001, 2005 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, write to the Free
  18    Software Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA
  19    02111-1307 USA.  */
  20
  21 #include <math.h>
  22
  23 #include "math_private.h"
  24
  25
  26 void
  27 __sincos (double x, double *sinx, double *cosx)
  28 {
  29   int32_t ix;
  30
  31   /* High word of x. */
  32   GET_HIGH_WORD (ix, x);
  33
  34   /* |x| ~< pi/4 */
  35   ix &= 0x7fffffff;
  36   if (ix>=0x7ff00000)
  37     {
  38       /* sin(Inf or NaN) is NaN */
  39       *sinx = *cosx = x - x;
  40     }
  41   else
  42     {
  43       *sinx = __sin (x);
  44       *cosx = __cos (x);
  45     }
  46 }
  47 weak_alias (__sincos, sincos)
  48 #ifdef NO_LONG_DOUBLE
  49 strong_alias (__sincos, __sincosl)
  50 weak_alias (__sincos, sincosl)
  51 #endif