compiler/mlib/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 #ifndef lint
  17 static char rcsid[] = "$FreeBSD: src/lib/msun/src/w_atanhf.c,v 1.5 1999/08/28 00:06:59 peter Exp $";
  18 #endif
  19
  20 /*
  21  * wrapper atanhf(x)
  22  */
  23
  24 #include "math.h"
  25 #include "math_private.h"
  26
  27
  28 float
  29 atanhf(float x)         /* wrapper atanhf */
  30 {
  31 #ifdef _IEEE_LIBM
  32         return __ieee754_atanhf(x);
  33 #else
  34         float z,y;
  35         z = __ieee754_atanhf(x);
  36         if(_LIB_VERSION == _IEEE_ || isnanf(x)) return z;
  37         y = fabsf(x);
  38         if(y>=(float)1.0) {
  39             if(y>(float)1.0)
  40                 /* atanhf(|x|>1) */
  41                 return (float)__kernel_standard((double)x,(double)x,130);
  42             else
  43                 /* atanhf(|x|==1) */
  44                 return (float)__kernel_standard((double)x,(double)x,131);
  45         } else
  46             return z;
  47 #endif
  48 }