compiler/mlib/w_acosh.c

   1 /* @(#)w_acosh.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 #ifndef lint
  14 static char rcsid[] = "$FreeBSD: src/lib/msun/src/w_acosh.c,v 1.5 1999/08/28 00:06:57 peter Exp $";
  15 #endif
  16
  17 /*
  18  * wrapper acosh(x)
  19  */
  20
  21 #include "math.h"
  22 #include "math_private.h"
  23
  24 #ifdef __STDC__
  25         double acosh(double x)          /* wrapper acosh */
  26 #else
  27         double acosh(x)                 /* wrapper acosh */
  28         double x;
  29 #endif
  30 {
  31 #ifdef _IEEE_LIBM
  32         return __ieee754_acosh(x);
  33 #else
  34         double z;
  35         z = __ieee754_acosh(x);
  36         if(_LIB_VERSION == _IEEE_ || isnan(x)) return z;
  37         if(x<1.0) {
  38                 return __kernel_standard(x,x,29); /* acosh(x<1) */
  39         } else
  40             return z;
  41 #endif
  42 }