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/* Return value of complex exponential function for double complex 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 <fenv.h>
#include <math.h>
 
#include "math_private.h"
 
 
__complex__ double
__cexp (__complex__ double x)
{
  __complex__ double retval;
  int rcls = fpclassify (__real__ x);
  int icls = fpclassify (__imag__ x);
 
  if (rcls >= FP_ZERO)
    {
      /* Real part is finite.  */
      if (icls >= FP_ZERO)
        {
          /* Imaginary part is finite.  */
          double exp_val = __ieee754_exp (__real__ x);
          double sinix, cosix;
 
          __sincos (__imag__ x, &sinix, &cosix);
 
          if (isfinite (exp_val))
            {
              __real__ retval = exp_val * cosix;
              __imag__ retval = exp_val * sinix;
            }
          else
            {
              __real__ retval = __copysign (exp_val, cosix);
              __imag__ retval = __copysign (exp_val, sinix);
            }
        }
      else
        {
          /* If the imaginary part is +-inf or NaN and the real part
             is not +-inf the result is NaN + iNaN.  */
          __real__ retval = __nan ("");
          __imag__ retval = __nan ("");
 
#ifdef FE_INVALID
          feraiseexcept (FE_INVALID);
#endif
        }
    }
  else if (rcls == FP_INFINITE)
    {
      /* Real part is infinite.  */
      if (icls >= FP_ZERO)
        {
          /* Imaginary part is finite.  */
          double value = signbit (__real__ x) ? 0.0 : HUGE_VAL;
 
          if (icls == FP_ZERO)
            {
              /* Imaginary part is 0.0.  */
              __real__ retval = value;
              __imag__ retval = __imag__ x;
            }
          else
            {
              double sinix, cosix;
 
              __sincos (__imag__ x, &sinix, &cosix);
 
              __real__ retval = __copysign (value, cosix);
              __imag__ retval = __copysign (value, sinix);
            }
        }
      else if (signbit (__real__ x) == 0)
        {
          __real__ retval = HUGE_VAL;
          __imag__ retval = __nan ("");
 
#ifdef FE_INVALID
          if (icls == FP_INFINITE)
            feraiseexcept (FE_INVALID);
#endif
        }
      else
        {
          __real__ retval = 0.0;
          __imag__ retval = __copysign (0.0, __imag__ x);
        }
    }
  else
    {
      /* If the real part is NaN the result is NaN + iNaN.  */
      __real__ retval = __nan ("");
      __imag__ retval = __nan ("");
 
#ifdef FE_INVALID
      if (rcls != FP_NAN || icls != FP_NAN)
        feraiseexcept (FE_INVALID);
#endif
    }
 
  return retval;
}
weak_alias (__cexp, cexp)
#ifdef NO_LONG_DOUBLE
strong_alias (__cexp, __cexpl)
weak_alias (__cexp, cexpl)
#endif

Line No.	Rev	Author	Line
1	148	jeremybenn	`/* Return value of complex exponential function for double complex 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 <fenv.h>`
23			`#include <math.h>`
24
25			`#include "math_private.h"`
26
27
28			`__complex__ double`
29			`__cexp (__complex__ double x)`
30			`{`
31			`__complex__ double retval;`
32			`int rcls = fpclassify (__real__ x);`
33			`int icls = fpclassify (__imag__ x);`
34
35			`if (rcls >= FP_ZERO)`
36			`{`
37			`/* Real part is finite. */`
38			`if (icls >= FP_ZERO)`
39			`{`
40			`/* Imaginary part is finite. */`
41			`double exp_val = __ieee754_exp (__real__ x);`
42			`double sinix, cosix;`
43
44			`__sincos (__imag__ x, &sinix, &cosix);`
45
46			`if (isfinite (exp_val))`
47			`{`
48			`__real__ retval = exp_val * cosix;`
49			`__imag__ retval = exp_val * sinix;`
50			`}`
51			`else`
52			`{`
53			`__real__ retval = __copysign (exp_val, cosix);`
54			`__imag__ retval = __copysign (exp_val, sinix);`
55			`}`
56			`}`
57			`else`
58			`{`
59			`/* If the imaginary part is +-inf or NaN and the real part`
60			`is not +-inf the result is NaN + iNaN. */`
61			`__real__ retval = __nan ("");`
62			`__imag__ retval = __nan ("");`
63
64			`#ifdef FE_INVALID`
65			`feraiseexcept (FE_INVALID);`
66			`#endif`
67			`}`
68			`}`
69			`else if (rcls == FP_INFINITE)`
70			`{`
71			`/* Real part is infinite. */`
72			`if (icls >= FP_ZERO)`
73			`{`
74			`/* Imaginary part is finite. */`
75			`double value = signbit (__real__ x) ? 0.0 : HUGE_VAL;`
76
77			`if (icls == FP_ZERO)`
78			`{`
79			`/* Imaginary part is 0.0. */`
80			`__real__ retval = value;`
81			`__imag__ retval = __imag__ x;`
82			`}`
83			`else`
84			`{`
85			`double sinix, cosix;`
86
87			`__sincos (__imag__ x, &sinix, &cosix);`
88
89			`__real__ retval = __copysign (value, cosix);`
90			`__imag__ retval = __copysign (value, sinix);`
91			`}`
92			`}`
93			`else if (signbit (__real__ x) == 0)`
94			`{`
95			`__real__ retval = HUGE_VAL;`
96			`__imag__ retval = __nan ("");`
97
98			`#ifdef FE_INVALID`
99			`if (icls == FP_INFINITE)`
100			`feraiseexcept (FE_INVALID);`
101			`#endif`
102			`}`
103			`else`
104			`{`
105			`__real__ retval = 0.0;`
106			`__imag__ retval = __copysign (0.0, __imag__ x);`
107			`}`
108			`}`
109			`else`
110			`{`
111			`/* If the real part is NaN the result is NaN + iNaN. */`
112			`__real__ retval = __nan ("");`
113			`__imag__ retval = __nan ("");`
114
115			`#ifdef FE_INVALID`
116			`if (rcls != FP_NAN \|\| icls != FP_NAN)`
117			`feraiseexcept (FE_INVALID);`
118			`#endif`
119			`}`
120
121			`return retval;`
122			`}`
123			`weak_alias (__cexp, cexp)`
124			`#ifdef NO_LONG_DOUBLE`
125			`strong_alias (__cexp, __cexpl)`
126			`weak_alias (__cexp, cexpl)`
127			`#endif`

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