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993b3242 | 1 | /* Return value of complex exponential function for float complex value. |
34b402e5 UD |
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 Library General Public License as | |
8 | published by the Free Software Foundation; either version 2 of the | |
9 | 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 | Library General Public License for more details. | |
15 | ||
16 | You should have received a copy of the GNU Library General Public | |
17 | License along with the GNU C Library; see the file COPYING.LIB. If not, | |
18 | write to the Free Software Foundation, Inc., 59 Temple Place - Suite 330, | |
19 | Boston, MA 02111-1307, USA. */ | |
20 | ||
21 | #include <complex.h> | |
22 | #include <math.h> | |
23 | ||
24 | ||
25 | __complex__ double | |
26 | __cexp (__complex__ double x) | |
27 | { | |
28 | __complex__ double retval; | |
29 | ||
30 | if (isfinite (__real__ x)) | |
31 | { | |
32 | if (isfinite (__imag__ x)) | |
33 | { | |
993b3242 UD |
34 | double exp_val = __exp (__real__ x); |
35 | ||
36 | __real__ retval = exp_val * __cos (__imag__ x); | |
37 | __imag__ retval = exp_val * __sin (__imag__ x); | |
34b402e5 UD |
38 | } |
39 | else | |
993b3242 UD |
40 | { |
41 | /* If the imaginary part is +-inf or NaN and the real part | |
42 | is not +-inf the result is NaN + iNaN. */ | |
43 | __real__ retval = __nan (""); | |
44 | __imag__ retval = __nan (""); | |
45 | } | |
34b402e5 UD |
46 | } |
47 | else if (__isinf (__real__ x)) | |
48 | { | |
993b3242 | 49 | if (isfinite (__imag__ x)) |
34b402e5 UD |
50 | { |
51 | if (signbit (__real__ x) == 0 && __imag__ x == 0.0) | |
52 | retval = HUGE_VAL; | |
53 | else | |
993b3242 UD |
54 | { |
55 | double value = signbit (__real__ x) ? 0.0 : HUGE_VAL; | |
56 | ||
57 | __real__ retval = value * __cos (__imag__ x); | |
58 | __imag__ retval = value * __sin (__imag__ x); | |
59 | } | |
60 | } | |
61 | else if (signbit (__real__ x) == 0) | |
62 | { | |
63 | __real__ retval = HUGE_VAL; | |
64 | __imag__ retval = __nan (""); | |
34b402e5 | 65 | } |
34b402e5 UD |
66 | else |
67 | retval = 0.0; | |
68 | } | |
69 | else | |
993b3242 UD |
70 | { |
71 | /* If the real part is NaN the result is NaN + iNaN. */ | |
72 | __real__ retval = __nan (""); | |
73 | __imag__ retval = __nan (""); | |
74 | } | |
34b402e5 UD |
75 | |
76 | return retval; | |
77 | } | |
78 | weak_alias (__cexp, cexp) | |
993b3242 UD |
79 | #ifdef NO_LONG_DOUBLE |
80 | string_alias (__cexp, __cexpl) | |
81 | weak_alias (__cexp, cexpl) | |
82 | #endif |