lib/libm/src/w_atanhf.c

   1 /* w_atanhf.c -- float version of w_atanh.c.
   2  * Conversion to float by Ian Lance Taylor, Cygnus Support, ian@cygnus.com.
   3  */
   4
   5 /*
   6  * ====================================================
   7  * Copyright (C) 1993 by Sun Microsystems, Inc. All rights reserved.
   8  *
   9  * Developed at SunPro, a Sun Microsystems, Inc. business.
  10  * Permission to use, copy, modify, and distribute this
  11  * software is freely granted, provided that this notice
  12  * is preserved.
  13  * ====================================================
  14  */
  15
  16 #include <sys/cdefs.h>
  17 #if defined(LIBM_SCCS) && !defined(lint)
  18 __RCSID("$NetBSD: w_atanhf.c,v 1.6 2002/05/26 22:02:00 wiz Exp $");
  19 #endif
  20
  21 /*
  22  * wrapper atanhf(x)
  23  */
  24
  25 #include "math.h"
  26 #include "math_private.h"
  27
  28
  29 float
  30 atanhf(float x)         /* wrapper atanhf */
  31 {
  32 #ifdef _IEEE_LIBM
  33         return __ieee754_atanhf(x);
  34 #else
  35         float z,y;
  36         z = __ieee754_atanhf(x);
  37         if(_LIB_VERSION == _IEEE_ || isnanf(x)) return z;
  38         y = fabsf(x);
  39         if(y>=(float)1.0) {
  40             if(y>(float)1.0)
  41                 /* atanhf(|x|>1) */
  42                 return (float)__kernel_standard((double)x,(double)x,130);
  43             else
  44                 /* atanhf(|x|==1) */
  45                 return (float)__kernel_standard((double)x,(double)x,131);
  46         } else
  47             return z;
  48 #endif
  49 }