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[/] [openrisc/] [trunk/] [gnu-old/] [newlib-1.17.0/] [newlib/] [libc/] [sys/] [linux/] [cmath/] [s_casinh.c] - Blame information for rev 148

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/* Return arc hyperbole sine 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
__casinh (__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 (HUGE_VAL, __real__ x);
 
          if (rcls == FP_NAN)
            __imag__ res = __nan ("");
          else
            __imag__ res = __copysign (rcls >= FP_ZERO ? M_PI_2 : M_PI_4,
                                       __imag__ x);
        }
      else if (rcls <= FP_INFINITE)
        {
          __real__ res = __real__ x;
          if ((rcls == FP_INFINITE && icls >= FP_ZERO)
              || (rcls == FP_NAN && icls == FP_ZERO))
            __imag__ res = __copysign (0.0, __imag__ x);
          else
            __imag__ res = __nan ("");
        }
      else
        {
          __real__ res = __nan ("");
          __imag__ res = __nan ("");
        }
    }
  else if (rcls == FP_ZERO && icls == FP_ZERO)
    {
      res = x;
    }
  else
    {
      __complex__ double y;
 
      __real__ y = (__real__ x - __imag__ x) * (__real__ x + __imag__ x) + 1.0;
      __imag__ y = 2.0 * __real__ x * __imag__ x;
 
      y = __csqrt (y);
 
      __real__ y += __real__ x;
      __imag__ y += __imag__ x;
 
      res = __clog (y);
    }
 
  return res;
}
weak_alias (__casinh, casinh)
#ifdef NO_LONG_DOUBLE
strong_alias (__casinh, __casinhl)
weak_alias (__casinh, casinhl)
#endif

Line No.	Rev	Author	Line
1	148	jeremybenn	`/* Return arc hyperbole sine 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			`#include "math_private.h"`
24
25			`__complex__ double`
26			`__casinh (__complex__ double x)`
27			`{`
28			`__complex__ double res;`
29			`int rcls = fpclassify (__real__ x);`
30			`int icls = fpclassify (__imag__ x);`
31
32			`if (rcls <= FP_INFINITE \|\| icls <= FP_INFINITE)`
33			`{`
34			`if (icls == FP_INFINITE)`
35			`{`
36			`__real__ res = __copysign (HUGE_VAL, __real__ x);`
37
38			`if (rcls == FP_NAN)`
39			`__imag__ res = __nan ("");`
40			`else`
41			`__imag__ res = __copysign (rcls >= FP_ZERO ? M_PI_2 : M_PI_4,`
42			`__imag__ x);`
43			`}`
44			`else if (rcls <= FP_INFINITE)`
45			`{`
46			`__real__ res = __real__ x;`
47			`if ((rcls == FP_INFINITE && icls >= FP_ZERO)`
48			`\|\| (rcls == FP_NAN && icls == FP_ZERO))`
49			`__imag__ res = __copysign (0.0, __imag__ x);`
50			`else`
51			`__imag__ res = __nan ("");`
52			`}`
53			`else`
54			`{`
55			`__real__ res = __nan ("");`
56			`__imag__ res = __nan ("");`
57			`}`
58			`}`
59			`else if (rcls == FP_ZERO && icls == FP_ZERO)`
60			`{`
61			`res = x;`
62			`}`
63			`else`
64			`{`
65			`__complex__ double y;`
66
67			`__real__ y = (__real__ x - __imag__ x) * (__real__ x + __imag__ x) + 1.0;`
68			`__imag__ y = 2.0 * __real__ x * __imag__ x;`
69
70			`y = __csqrt (y);`
71
72			`__real__ y += __real__ x;`
73			`__imag__ y += __imag__ x;`
74
75			`res = __clog (y);`
76			`}`
77
78			`return res;`
79			`}`
80			`weak_alias (__casinh, casinh)`
81			`#ifdef NO_LONG_DOUBLE`
82			`strong_alias (__casinh, __casinhl)`
83			`weak_alias (__casinh, casinhl)`
84			`#endif`

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[/] [openrisc/] [trunk/] [gnu-old/] [newlib-1.17.0/] [newlib/] [libc/] [sys/] [linux/] [cmath/] [s_casinh.c] - Blame information for rev 148