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glibc  2.9
s_sincos.c
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00001 /* Compute sine and cosine of argument.
00002    Copyright (C) 1997, 2001, 2005 Free Software Foundation, Inc.
00003    This file is part of the GNU C Library.
00004    Contributed by Ulrich Drepper <drepper@cygnus.com>, 1997.
00005 
00006    The GNU C Library is free software; you can redistribute it and/or
00007    modify it under the terms of the GNU Lesser General Public
00008    License as published by the Free Software Foundation; either
00009    version 2.1 of the License, or (at your option) any later version.
00010 
00011    The GNU C Library is distributed in the hope that it will be useful,
00012    but WITHOUT ANY WARRANTY; without even the implied warranty of
00013    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
00014    Lesser General Public License for more details.
00015 
00016    You should have received a copy of the GNU Lesser General Public
00017    License along with the GNU C Library; if not, write to the Free
00018    Software Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA
00019    02111-1307 USA.  */
00020 
00021 #include <math.h>
00022 
00023 #include "math_private.h"
00024 
00025 
00026 void
00027 __sincos (double x, double *sinx, double *cosx)
00028 {
00029   int32_t ix;
00030 
00031   /* High word of x. */
00032   GET_HIGH_WORD (ix, x);
00033 
00034   /* |x| ~< pi/4 */
00035   ix &= 0x7fffffff;
00036   if (ix>=0x7ff00000)
00037     {
00038       /* sin(Inf or NaN) is NaN */
00039       *sinx = *cosx = x - x;
00040     }
00041   else
00042     {
00043       *sinx = __sin (x);
00044       *cosx = __cos (x);
00045     }
00046 }
00047 weak_alias (__sincos, sincos)
00048 #ifdef NO_LONG_DOUBLE
00049 strong_alias (__sincos, __sincosl)
00050 weak_alias (__sincos, sincosl)
00051 #endif