projects / thirdparty / glibc.git / blame
| Commit | Line | Data |
|---|---|---|
| 993b3242 UD |
1 | /* Complex cosine hyperbole function for double. |
| 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 | __ccosh (__complex__ double x) | |
| 27 | { | |
| 28 | __complex__ double retval; | |
| 29 | ||
| 30 | __real__ x = fabs (__real__ x); | |
| 31 | ||
| 32 | if (isfinite (__real__ x)) | |
| 33 | { | |
| 34 | if (isfinite (__imag__ x)) | |
| 35 | { | |
| 36 | double exp_val = __exp (__real__ x); | |
| 37 | double rec_exp_val = 1.0 / exp_val; | |
| 38 | ||
| 39 | __real__ retval = 0.5 * (exp_val + rec_exp_val) * __cos (__imag__ x); | |
| 40 | __imag__ retval = 0.5 * (exp_val + rec_exp_val) * __sin (__imag__ x); | |
| 41 | } | |
| 42 | else | |
| 43 | { | |
| 44 | if (__real__ x == 0) | |
| 45 | { | |
| 46 | __imag__ retval = 0.0; | |
| 47 | __real__ retval = __nan ("") + __nan (""); | |
| 48 | } | |
| 49 | else | |
| 50 | { | |
| 51 | __real__ retval = __nan (""); | |
| 52 | __imag__ retval = __nan ("") + __nan (""); | |
| 53 | } | |
| 54 | } | |
| 55 | } | |
| 56 | else if (__isinf (__real__ x)) | |
| 57 | { | |
| 58 | if (__imag__ x == 0.0) | |
| 59 | { | |
| 60 | __real__ retval = HUGE_VAL; | |
| 61 | __imag__ retval = __imag__ x; | |
| 62 | } | |
| 63 | else if (isfinite (__imag__ x)) | |
| 64 | { | |
| 65 | __real__ retval = __copysign (HUGE_VAL, __cos (__imag__ x)); | |
| 66 | __imag__ retval = __copysign (HUGE_VAL, __sin (__imag__ x)); | |
| 67 | } | |
| 68 | else | |
| 69 | { | |
| 70 | /* The addition raises the invalid exception. */ | |
| 71 | __real__ retval = HUGE_VAL; | |
| 72 | __imag__ retval = __nan ("") + __nan (""); | |
| 73 | } | |
| 74 | } | |
| 75 | else | |
| 76 | { | |
| 77 | if (__imag__ x == 0.0) | |
| 78 | { | |
| 79 | __real__ retval = __nan (""); | |
| 80 | __imag__ retval = __imag__ x; | |
| 81 | } | |
| 82 | else | |
| 83 | { | |
| 84 | __real__ retval = __nan (""); | |
| 85 | __imag__ retval = __nan (""); | |
| 86 | } | |
| 87 | } | |
| 88 | ||
| 89 | return retval; | |
| 90 | } | |
| 91 | weak_alias (__ccosh, ccosh) | |
| 92 | #ifdef NO_LONG_DOUBLE | |
| 93 | strong_alias (__ccosh, __ccoshl) | |
| 94 | weak_alias (__ccosh, ccoshl) | |
| 95 | #endif |