toolchain/gcc/newlib/libm/math/wf_atanh.c

   1 /* wf_atanh.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  * wrapper atanhf(x)
  17  */
  18
  19 #include "fdlibm.h"
  20 #include <errno.h>
  21
  22 #ifdef __STDC__
  23         float atanhf(float x)           /* wrapper atanhf */
  24 #else
  25         float atanhf(x)                 /* wrapper atanhf */
  26         float x;
  27 #endif
  28 {
  29 #ifdef _IEEE_LIBM
  30         return __ieee754_atanhf(x);
  31 #else
  32         float z,y;
  33         struct exception exc;
  34         z = __ieee754_atanhf(x);
  35         if(_LIB_VERSION == _IEEE_ || isnanf(x)) return z;
  36         y = fabsf(x);
  37         if(y>=(float)1.0) {
  38             if(y>(float)1.0) {
  39                 /* atanhf(|x|>1) */
  40                 exc.type = DOMAIN;
  41                 exc.name = "atanhf";
  42                 exc.err = 0;
  43                 exc.arg1 = exc.arg2 = (double)x;
  44                 exc.retval = 0.0/0.0;
  45                 if (_LIB_VERSION == _POSIX_)
  46                   errno = EDOM;
  47                 else if (!matherr(&exc)) {
  48                   errno = EDOM;
  49                 }
  50             } else {
  51                 /* atanhf(|x|=1) */
  52                 exc.type = SING;
  53                 exc.name = "atanhf";
  54                 exc.err = 0;
  55                 exc.arg1 = exc.arg2 = (double)x;
  56                 exc.retval = x/0.0;     /* sign(x)*inf */
  57                 if (_LIB_VERSION == _POSIX_)
  58                   errno = EDOM;
  59                 else if (!matherr(&exc)) {
  60                   errno = EDOM;
  61                 }
  62             }
  63             if (exc.err != 0)
  64               errno = exc.err;
  65             return (float)exc.retval;
  66         } else
  67             return z;
  68 #endif
  69 }
  70
  71 #ifdef _DOUBLE_IS_32BITS
  72
  73 #ifdef __STDC__
  74         double atanh(double x)
  75 #else
  76         double atanh(x)
  77         double x;
  78 #endif
  79 {
  80         return (double) atanhf((float) x);
  81 }
  82
  83 #endif /* defined(_DOUBLE_IS_32BITS) */