| 1 | /* Complex hyperbole tangent for long double. |
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| 2 | Copyright (C) 1997 Free Software Foundation, Inc. |
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| 3 | This file is part of the GNU C Library. |
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| 4 | Contributed by Ulrich Drepper <drepper@cygnus.com>, 1997. |
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| 5 | |
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| 6 | The GNU C Library is free software; you can redistribute it and/or |
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| 7 | modify it under the terms of the GNU Lesser General Public |
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| 8 | License as published by the Free Software Foundation; either |
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| 9 | version 2.1 of the License, or (at your option) any later version. |
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| 10 | |
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| 11 | The GNU C Library is distributed in the hope that it will be useful, |
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| 12 | but WITHOUT ANY WARRANTY; without even the implied warranty of |
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| 13 | MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU |
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| 14 | Lesser General Public License for more details. |
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| 15 | |
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| 16 | You should have received a copy of the GNU Lesser General Public |
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| 17 | License along with the GNU C Library; if not, write to the Free |
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| 18 | Software Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA |
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| 19 | 02111-1307 USA. */ |
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| 20 | |
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| 21 | #include <complex.h> |
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| 22 | #include <fenv.h> |
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| 23 | #include <math.h> |
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| 24 | |
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| 25 | #include "math_private.h" |
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| 26 | |
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| 27 | |
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| 28 | __complex__ long double |
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| 29 | __ctanhl (__complex__ long double x) |
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| 30 | { |
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| 31 | __complex__ long double res; |
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| 32 | |
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| 33 | if (!isfinite (__real__ x) || !isfinite (__imag__ x)) |
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| 34 | { |
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| 35 | if (__isinfl (__real__ x)) |
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| 36 | { |
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| 37 | __real__ res = __copysignl (1.0, __real__ x); |
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| 38 | __imag__ res = __copysignl (0.0, __imag__ x); |
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| 39 | } |
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| 40 | else if (__imag__ x == 0.0) |
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| 41 | { |
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| 42 | res = x; |
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| 43 | } |
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| 44 | else |
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| 45 | { |
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| 46 | __real__ res = __nanl (""); |
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| 47 | __imag__ res = __nanl (""); |
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| 48 | |
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| 49 | #ifdef FE_INVALID |
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| 50 | if (__isinfl (__imag__ x)) |
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| 51 | feraiseexcept (FE_INVALID); |
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| 52 | #endif |
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| 53 | } |
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| 54 | } |
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| 55 | else |
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| 56 | { |
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| 57 | long double sin2ix, cos2ix; |
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| 58 | long double den; |
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| 59 | |
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| 60 | __sincosl (2.0 * __imag__ x, &sin2ix, &cos2ix); |
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| 61 | |
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| 62 | den = (__ieee754_coshl (2.0 * __real__ x) + cos2ix); |
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| 63 | |
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| 64 | __real__ res = __ieee754_sinhl (2.0 * __real__ x) / den; |
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| 65 | __imag__ res = sin2ix / den; |
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| 66 | } |
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| 67 | |
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| 68 | return res; |
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| 69 | } |
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| 70 | weak_alias (__ctanhl, ctanhl) |
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