math/w_asin.c

   1 /* @(#)w_asin.c 5.1 93/09/24 */
   2 /*
   3  * ====================================================
   4  * Copyright (C) 1993 by Sun Microsystems, Inc. All rights reserved.
   5  *
   6  * Developed at SunPro, a Sun Microsystems, Inc. business.
   7  * Permission to use, copy, modify, and distribute this
   8  * software is freely granted, provided that this notice
   9  * is preserved.
  10  * ====================================================
  11  */
  12
  13 #if defined(LIBM_SCCS) && !defined(lint)
  14 static char rcsid[] = "$NetBSD: w_asin.c,v 1.6 1995/05/10 20:48:35 jtc Exp $";
  15 #endif
  16
  17 /*
  18  * wrapper asin(x)
  19  */
  20
  21
  22 #include <math.h>
  23 #include "math_private.h"
  24
  25
  26 #ifdef __STDC__
  27         double __asin(double x)         /* wrapper asin */
  28 #else
  29         double __asin(x)                        /* wrapper asin */
  30         double x;
  31 #endif
  32 {
  33 #ifdef _IEEE_LIBM
  34         return __ieee754_asin(x);
  35 #else
  36         double z;
  37         z = __ieee754_asin(x);
  38         if(_LIB_VERSION == _IEEE_ || __isnan(x)) return z;
  39         if(fabs(x)>1.0) {
  40                 return __kernel_standard(x,x,2); /* asin(|x|>1) */
  41         } else
  42             return z;
  43 #endif
  44 }
  45 weak_alias (__asin, asin)
  46 #ifdef NO_LONG_DOUBLE
  47 strong_alias (__asin, __asinl)
  48 weak_alias (__asin, asinl)
  49 #endif