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[/] [openrisc/] [trunk/] [gnu-dev/] [or1k-gcc/] [libquadmath/] [math/] [catanq.c] - Blame information for rev 742

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/* Return arc tangent of complex __float128 value.
   Copyright (C) 1997, 1998 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 "quadmath-imp.h"
 
 
__complex128
catanq (__complex128 x)
{
  __complex128 res;
  int rcls = fpclassifyq (__real__ x);
  int icls = fpclassifyq (__imag__ x);
 
  if (rcls <= QUADFP_INFINITE || icls <= QUADFP_INFINITE)
    {
      if (rcls == QUADFP_INFINITE)
        {
          __real__ res = copysignq (M_PI_2q, __real__ x);
          __imag__ res = copysignq (0.0, __imag__ x);
        }
      else if (icls == QUADFP_INFINITE)
        {
          if (rcls >= QUADFP_ZERO)
            __real__ res = copysignq (M_PI_2q, __real__ x);
          else
            __real__ res = nanq ("");
          __imag__ res = copysignq (0.0, __imag__ x);
        }
      else if (icls == QUADFP_ZERO || icls == QUADFP_INFINITE)
        {
          __real__ res = nanq ("");
          __imag__ res = copysignq (0.0, __imag__ x);
        }
      else
        {
          __real__ res = nanq ("");
          __imag__ res = nanq ("");
        }
    }
  else if (rcls == QUADFP_ZERO && icls == QUADFP_ZERO)
    {
      res = x;
    }
  else
    {
      __float128 r2, num, den;
 
      r2 = __real__ x * __real__ x;
 
      den = 1 - r2 - __imag__ x * __imag__ x;
 
      __real__ res = 0.5 * atan2q (2.0 * __real__ x, den);
 
      num = __imag__ x + 1.0;
      num = r2 + num * num;
 
      den = __imag__ x - 1.0;
      den = r2 + den * den;
 
      __imag__ res = 0.25 * logq (num / den);
    }
 
  return res;
}

Line No.	Rev	Author	Line
1	740	jeremybenn	`/* Return arc tangent of complex __float128 value.`
2			`Copyright (C) 1997, 1998 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 "quadmath-imp.h"`
22
23
24			`__complex128`
25			`catanq (__complex128 x)`
26			`{`
27			`__complex128 res;`
28			`int rcls = fpclassifyq (__real__ x);`
29			`int icls = fpclassifyq (__imag__ x);`
30
31			`if (rcls <= QUADFP_INFINITE \|\| icls <= QUADFP_INFINITE)`
32			`{`
33			`if (rcls == QUADFP_INFINITE)`
34			`{`
35			`__real__ res = copysignq (M_PI_2q, __real__ x);`
36			`__imag__ res = copysignq (0.0, __imag__ x);`
37			`}`
38			`else if (icls == QUADFP_INFINITE)`
39			`{`
40			`if (rcls >= QUADFP_ZERO)`
41			`__real__ res = copysignq (M_PI_2q, __real__ x);`
42			`else`
43			`__real__ res = nanq ("");`
44			`__imag__ res = copysignq (0.0, __imag__ x);`
45			`}`
46			`else if (icls == QUADFP_ZERO \|\| icls == QUADFP_INFINITE)`
47			`{`
48			`__real__ res = nanq ("");`
49			`__imag__ res = copysignq (0.0, __imag__ x);`
50			`}`
51			`else`
52			`{`
53			`__real__ res = nanq ("");`
54			`__imag__ res = nanq ("");`
55			`}`
56			`}`
57			`else if (rcls == QUADFP_ZERO && icls == QUADFP_ZERO)`
58			`{`
59			`res = x;`
60			`}`
61			`else`
62			`{`
63			`__float128 r2, num, den;`
64
65			`r2 = __real__ x * __real__ x;`
66
67			`den = 1 - r2 - __imag__ x * __imag__ x;`
68
69			`__real__ res = 0.5 * atan2q (2.0 * __real__ x, den);`
70
71			`num = __imag__ x + 1.0;`
72			`num = r2 + num * num;`
73
74			`den = __imag__ x - 1.0;`
75			`den = r2 + den * den;`
76
77			`__imag__ res = 0.25 * logq (num / den);`
78			`}`
79
80			`return res;`
81			`}`

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[/] [openrisc/] [trunk/] [gnu-dev/] [or1k-gcc/] [libquadmath/] [math/] [catanq.c] - Blame information for rev 742