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[/] [openrisc/] [trunk/] [gnu-stable/] [newlib-1.18.0/] [newlib/] [libc/] [sys/] [linux/] [cmath/] [s_catanh.c] - Blame information for rev 829

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/* Return arc hyperbole tangent for double value.
   Copyright (C) 1997 Free Software Foundation, Inc.
   This file is part of the GNU C Library.
   Contributed by Ulrich Drepper <drepper@cygnus.com>, 1997.
 
   The GNU C Library is free software; you can redistribute it and/or
   modify it under the terms of the GNU Lesser General Public
   License as published by the Free Software Foundation; either
   version 2.1 of the License, or (at your option) any later version.
 
   The GNU C Library is distributed in the hope that it will be useful,
   but WITHOUT ANY WARRANTY; without even the implied warranty of
   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
   Lesser General Public License for more details.
 
   You should have received a copy of the GNU Lesser General Public
   License along with the GNU C Library; if not, write to the Free
   Software Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA
   02111-1307 USA.  */
 
#include <complex.h>
#include <math.h>
 
#include "math_private.h"
 
 
__complex__ double
__catanh (__complex__ double x)
{
  __complex__ double res;
  int rcls = fpclassify (__real__ x);
  int icls = fpclassify (__imag__ x);
 
  if (rcls <= FP_INFINITE || icls <= FP_INFINITE)
    {
      if (icls == FP_INFINITE)
        {
          __real__ res = __copysign (0.0, __real__ x);
          __imag__ res = __copysign (M_PI_2, __imag__ x);
        }
      else if (rcls == FP_INFINITE || rcls == FP_ZERO)
        {
          __real__ res = __copysign (0.0, __real__ x);
          if (icls >= FP_ZERO)
            __imag__ res = __copysign (M_PI_2, __imag__ x);
          else
            __imag__ res = __nan ("");
        }
      else
        {
          __real__ res = __nan ("");
          __imag__ res = __nan ("");
        }
    }
  else if (rcls == FP_ZERO && icls == FP_ZERO)
    {
      res = x;
    }
  else
    {
      double i2, num, den;
 
      i2 = __imag__ x * __imag__ x;
 
      num = 1.0 + __real__ x;
      num = i2 + num * num;
 
      den = 1.0 - __real__ x;
      den = i2 + den * den;
 
      __real__ res = 0.25 * (__ieee754_log (num) - __ieee754_log (den));
 
      den = 1 - __real__ x * __real__ x - i2;
 
      __imag__ res = 0.5 * __ieee754_atan2 (2.0 * __imag__ x, den);
    }
 
  return res;
}
weak_alias (__catanh, catanh)
#ifdef NO_LONG_DOUBLE
strong_alias (__catanh, __catanhl)
weak_alias (__catanh, catanhl)
#endif

Line No.	Rev	Author	Line
1	207	jeremybenn	`/* Return arc hyperbole tangent for double value.`
2			`Copyright (C) 1997 Free Software Foundation, Inc.`
3			`This file is part of the GNU C Library.`
4			`Contributed by Ulrich Drepper <drepper@cygnus.com>, 1997.`
5
6			`The GNU C Library is free software; you can redistribute it and/or`
7			`modify it under the terms of the GNU Lesser General Public`
8			`License as published by the Free Software Foundation; either`
9			`version 2.1 of the License, or (at your option) any later version.`
10
11			`The GNU C Library is distributed in the hope that it will be useful,`
12			`but WITHOUT ANY WARRANTY; without even the implied warranty of`
13			`MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU`
14			`Lesser General Public License for more details.`
15
16			`You should have received a copy of the GNU Lesser General Public`
17			`License along with the GNU C Library; if not, write to the Free`
18			`Software Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA`
19			`02111-1307 USA. */`
20
21			`#include <complex.h>`
22			`#include <math.h>`
23
24			`#include "math_private.h"`
25
26
27			`__complex__ double`
28			`__catanh (__complex__ double x)`
29			`{`
30			`__complex__ double res;`
31			`int rcls = fpclassify (__real__ x);`
32			`int icls = fpclassify (__imag__ x);`
33
34			`if (rcls <= FP_INFINITE \|\| icls <= FP_INFINITE)`
35			`{`
36			`if (icls == FP_INFINITE)`
37			`{`
38			`__real__ res = __copysign (0.0, __real__ x);`
39			`__imag__ res = __copysign (M_PI_2, __imag__ x);`
40			`}`
41			`else if (rcls == FP_INFINITE \|\| rcls == FP_ZERO)`
42			`{`
43			`__real__ res = __copysign (0.0, __real__ x);`
44			`if (icls >= FP_ZERO)`
45			`__imag__ res = __copysign (M_PI_2, __imag__ x);`
46			`else`
47			`__imag__ res = __nan ("");`
48			`}`
49			`else`
50			`{`
51			`__real__ res = __nan ("");`
52			`__imag__ res = __nan ("");`
53			`}`
54			`}`
55			`else if (rcls == FP_ZERO && icls == FP_ZERO)`
56			`{`
57			`res = x;`
58			`}`
59			`else`
60			`{`
61			`double i2, num, den;`
62
63			`i2 = __imag__ x * __imag__ x;`
64
65			`num = 1.0 + __real__ x;`
66			`num = i2 + num * num;`
67
68			`den = 1.0 - __real__ x;`
69			`den = i2 + den * den;`
70
71			`__real__ res = 0.25 * (__ieee754_log (num) - __ieee754_log (den));`
72
73			`den = 1 - __real__ x * __real__ x - i2;`
74
75			`__imag__ res = 0.5 * __ieee754_atan2 (2.0 * __imag__ x, den);`
76			`}`
77
78			`return res;`
79			`}`
80			`weak_alias (__catanh, catanh)`
81			`#ifdef NO_LONG_DOUBLE`
82			`strong_alias (__catanh, __catanhl)`
83			`weak_alias (__catanh, catanhl)`
84			`#endif`

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[/] [openrisc/] [trunk/] [gnu-stable/] [newlib-1.18.0/] [newlib/] [libc/] [sys/] [linux/] [cmath/] [s_catanh.c] - Blame information for rev 829