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85 lines
2.1 KiB
C
85 lines
2.1 KiB
C
/* Complex hyperbole tangent for double.
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Copyright (C) 1997, 2005 Free Software Foundation, Inc.
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This file is part of the GNU C Library.
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Contributed by Ulrich Drepper <drepper@cygnus.com>, 1997.
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The GNU C Library is free software; you can redistribute it and/or
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modify it under the terms of the GNU Lesser General Public
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License as published by the Free Software Foundation; either
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version 2.1 of the License, or (at your option) any later version.
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The GNU C Library is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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Lesser General Public License for more details.
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You should have received a copy of the GNU Lesser General Public
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License along with the GNU C Library; if not, write to the Free
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Software Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA
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02111-1307 USA. */
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#include <complex.h>
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#include <fenv.h>
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#include <math.h>
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#include "math_private.h"
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__complex__ double
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__ctanh (__complex__ double x)
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{
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__complex__ double res;
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if (!isfinite (__real__ x) || !isfinite (__imag__ x))
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{
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if (__isinf (__real__ x))
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{
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__real__ res = __copysign (1.0, __real__ x);
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__imag__ res = __copysign (0.0, __imag__ x);
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}
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else if (__imag__ x == 0.0)
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{
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res = x;
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}
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else
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{
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__real__ res = __nan ("");
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__imag__ res = __nan ("");
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#ifdef FE_INVALID
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if (__isinf (__imag__ x))
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feraiseexcept (FE_INVALID);
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#endif
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}
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}
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else
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{
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double sin2ix, cos2ix;
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double den;
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__sincos (2.0 * __imag__ x, &sin2ix, &cos2ix);
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den = (__ieee754_cosh (2.0 * __real__ x) + cos2ix);
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if (den == 0.0)
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{
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__complex__ double ez = __cexp (x);
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__complex__ double emz = __cexp (-x);
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res = (ez - emz) / (ez + emz);
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}
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else
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{
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__real__ res = __ieee754_sinh (2.0 * __real__ x) / den;
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__imag__ res = sin2ix / den;
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}
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}
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return res;
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}
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weak_alias (__ctanh, ctanh)
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#ifdef NO_LONG_DOUBLE
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strong_alias (__ctanh, __ctanhl)
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weak_alias (__ctanh, ctanhl)
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#endif
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