lib/libm/src/w_acos.c

   1 /* @(#)w_acos.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 #include <sys/cdefs.h>
  14 #if defined(LIBM_SCCS) && !defined(lint)
  15 __RCSID("$NetBSD: w_acos.c,v 1.9 2002/05/26 22:01:59 wiz Exp $");
  16 #endif
  17
  18 /*
  19  * wrap_acos(x)
  20  */
  21
  22 #include "math.h"
  23 #include "math_private.h"
  24
  25
  26 double
  27 acos(double x)          /* wrapper acos */
  28 {
  29 #ifdef _IEEE_LIBM
  30         return __ieee754_acos(x);
  31 #else
  32         double z;
  33         z = __ieee754_acos(x);
  34         if(_LIB_VERSION == _IEEE_ || isnan(x)) return z;
  35         if(fabs(x)>1.0) {
  36                 return __kernel_standard(x,x,1); /* acos(|x|>1) */
  37         } else
  38             return z;
  39 #endif
  40 }