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-rw-r--r--math/s_ctanhf.c82
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diff --git a/math/s_ctanhf.c b/math/s_ctanhf.c
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-/* Complex hyperbole tangent for float.
- Copyright (C) 1997, 2005 Free Software Foundation, Inc.
- This file is part of the GNU C Library.
- Contributed by Ulrich Drepper <drepper@cygnus.com>, 1997.
-
- The GNU C Library is free software; you can redistribute it and/or
- modify it under the terms of the GNU Lesser General Public
- License as published by the Free Software Foundation; either
- version 2.1 of the License, or (at your option) any later version.
-
- The GNU C Library is distributed in the hope that it will be useful,
- but WITHOUT ANY WARRANTY; without even the implied warranty of
- MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
- Lesser General Public License for more details.
-
- You should have received a copy of the GNU Lesser General Public
- License along with the GNU C Library; if not, write to the Free
- Software Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA
- 02111-1307 USA. */
-
-#include <complex.h>
-#include <fenv.h>
-#include <math.h>
-
-#include "math_private.h"
-
-
-__complex__ float
-__ctanhf (__complex__ float x)
-{
- __complex__ float res;
-
- if (!isfinite (__real__ x) || !isfinite (__imag__ x))
- {
- if (__isinff (__real__ x))
- {
- __real__ res = __copysignf (1.0, __real__ x);
- __imag__ res = __copysignf (0.0, __imag__ x);
- }
- else if (__imag__ x == 0.0)
- {
- res = x;
- }
- else
- {
- __real__ res = __nanf ("");
- __imag__ res = __nanf ("");
-
-#ifdef FE_INVALID
- if (__isinff (__imag__ x))
- feraiseexcept (FE_INVALID);
-#endif
- }
- }
- else
- {
- float sin2ix, cos2ix;
- float den;
-
- __sincosf (2.0 * __imag__ x, &sin2ix, &cos2ix);
-
- den = (__ieee754_coshf (2.0 * __real__ x) + cos2ix);
-
- if (den == 0.0f)
- {
- __complex__ float ez = __cexpf (x);
- __complex__ float emz = __cexpf (-x);
-
- res = (ez - emz) / (ez + emz);
- }
- else
- {
- __real__ res = __ieee754_sinhf (2.0 * __real__ x) / den;
- __imag__ res = sin2ix / den;
- }
- }
-
- return res;
-}
-#ifndef __ctanhf
-weak_alias (__ctanhf, ctanhf)
-#endif