projects / thirdparty / glibc.git / blame
| Commit | Line | Data |
|---|---|---|
| 3e5f5557 UD |
1 | /* Return value of complex exponential function for float 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 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__ float | |
| 26 | __cexpf (__complex__ float x) | |
| 27 | { | |
| 28 | __complex__ float retval; | |
| 29 | ||
| 30 | if (isfinite (__real__ x)) | |
| 31 | { | |
| 32 | if (isfinite (__imag__ x)) | |
| 33 | { | |
| e7fd8a39 UD |
34 | float exp_val = __expf (__real__ x); |
| 35 | ||
| 993b3242 UD |
36 | if (isfinite (exp_val)) |
| 37 | { | |
| 38 | __real__ retval = exp_val * __cosf (__imag__ x); | |
| 39 | __imag__ retval = exp_val * __sinf (__imag__ x); | |
| 40 | } | |
| 41 | else | |
| 42 | { | |
| 43 | __real__ retval = __copysignf (exp_val, __cosf (__imag__ x)); | |
| 44 | __imag__ retval = __copysignf (exp_val, __sinf (__imag__ x)); | |
| 45 | } | |
| 3e5f5557 UD |
46 | } |
| 47 | else | |
| e7fd8a39 UD |
48 | { |
| 49 | /* If the imaginary part is +-inf or NaN and the real part | |
| 50 | is not +-inf the result is NaN + iNaN. */ | |
| 51 | __real__ retval = __nanf (""); | |
| 52 | __imag__ retval = __nanf (""); | |
| 53 | } | |
| 3e5f5557 UD |
54 | } |
| 55 | else if (__isinff (__real__ x)) | |
| 56 | { | |
| 57 | if (isfinite (__imag__ x)) | |
| 58 | { | |
| 993b3242 UD |
59 | float value = signbit (__real__ x) ? 0.0 : HUGE_VALF; |
| 60 | ||
| 61 | if (__imag__ x == 0.0) | |
| 62 | { | |
| 63 | __real__ retval = value; | |
| 64 | __imag__ retval = __imag__ x; | |
| 65 | } | |
| 3e5f5557 | 66 | else |
| e7fd8a39 | 67 | { |
| 993b3242 UD |
68 | __real__ retval = __copysignf (value, __cosf (__imag__ x)); |
| 69 | __imag__ retval = __copysignf (value, __sinf (__imag__ x)); | |
| e7fd8a39 UD |
70 | } |
| 71 | } | |
| 72 | else if (signbit (__real__ x) == 0) | |
| 73 | { | |
| 74 | __real__ retval = HUGE_VALF; | |
| 75 | __imag__ retval = __nanf (""); | |
| 3e5f5557 | 76 | } |
| 3e5f5557 | 77 | else |
| 993b3242 UD |
78 | { |
| 79 | __real__ retval = 0.0; | |
| 80 | __imag__ retval = __copysignf (0.0, __imag__ x); | |
| 81 | } | |
| 3e5f5557 UD |
82 | } |
| 83 | else | |
| e7fd8a39 UD |
84 | { |
| 85 | /* If the real part is NaN the result is NaN + iNan. */ | |
| 86 | __real__ retval = __nanf (""); | |
| 87 | __imag__ retval = __nanf (""); | |
| 88 | } | |
| 3e5f5557 UD |
89 | |
| 90 | return retval; | |
| 91 | } | |
| 92 | weak_alias (__cexpf, cexpf) |