[444] | 1 | /* Complex hyperbole tangent for long 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 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__ long double |
---|
| 29 | __ctanhl (__complex__ long double x) |
---|
| 30 | { |
---|
| 31 | __complex__ long double res; |
---|
| 32 | |
---|
| 33 | if (!isfinite (__real__ x) || !isfinite (__imag__ x)) |
---|
| 34 | { |
---|
| 35 | if (__isinfl (__real__ x)) |
---|
| 36 | { |
---|
| 37 | __real__ res = __copysignl (1.0, __real__ x); |
---|
| 38 | __imag__ res = __copysignl (0.0, __imag__ x); |
---|
| 39 | } |
---|
| 40 | else if (__imag__ x == 0.0) |
---|
| 41 | { |
---|
| 42 | res = x; |
---|
| 43 | } |
---|
| 44 | else |
---|
| 45 | { |
---|
| 46 | __real__ res = __nanl (""); |
---|
| 47 | __imag__ res = __nanl (""); |
---|
| 48 | |
---|
| 49 | #ifdef FE_INVALID |
---|
| 50 | if (__isinfl (__imag__ x)) |
---|
| 51 | feraiseexcept (FE_INVALID); |
---|
| 52 | #endif |
---|
| 53 | } |
---|
| 54 | } |
---|
| 55 | else |
---|
| 56 | { |
---|
| 57 | long double sin2ix, cos2ix; |
---|
| 58 | long double den; |
---|
| 59 | |
---|
| 60 | __sincosl (2.0 * __imag__ x, &sin2ix, &cos2ix); |
---|
| 61 | |
---|
| 62 | den = (__ieee754_coshl (2.0 * __real__ x) + cos2ix); |
---|
| 63 | |
---|
| 64 | __real__ res = __ieee754_sinhl (2.0 * __real__ x) / den; |
---|
| 65 | __imag__ res = sin2ix / den; |
---|
| 66 | } |
---|
| 67 | |
---|
| 68 | return res; |
---|
| 69 | } |
---|
| 70 | weak_alias (__ctanhl, ctanhl) |
---|