diff options
Diffstat (limited to 'sysdeps/libm-ieee754/s_ctanh.c')
| -rw-r--r-- | sysdeps/libm-ieee754/s_ctanh.c | 64 |
1 files changed, 64 insertions, 0 deletions
diff --git a/sysdeps/libm-ieee754/s_ctanh.c b/sysdeps/libm-ieee754/s_ctanh.c new file mode 100644 index 0000000000..7c9b3197ef --- /dev/null +++ b/sysdeps/libm-ieee754/s_ctanh.c @@ -0,0 +1,64 @@ +/* Complex hyperbole tangent for double. + Copyright (C) 1997 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 Library General Public License as + published by the Free Software Foundation; either version 2 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 + Library General Public License for more details. + + You should have received a copy of the GNU Library General Public + License along with the GNU C Library; see the file COPYING.LIB. If not, + write to the Free Software Foundation, Inc., 59 Temple Place - Suite 330, + Boston, MA 02111-1307, USA. */ + +#include <complex.h> +#include <math.h> + +#include "math_private.h" + + +__complex__ double +__ctanh (__complex__ double x) +{ + __complex__ double res; + + if (!finite (__real__ x) || !finite (__imag__ x)) + { + if (__isinf (__real__ x)) + { + __real__ res = __copysign (1.0, __real__ x); + __imag__ res = __copysign (0.0, __imag__ x); + } + else if (__imag__ x == 0.0) + { + res = x; + } + else + { + __real__ res = __nan (""); + __imag__ res = __nan (""); + } + } + else + { + double den = (__ieee754_cosh (2.0 * __real__ x) + + __cos (2.0 * __imag__ x)); + + __real__ res = __ieee754_sinh (2.0 * __real__ x) / den; + __imag__ res = __sin (2.0 * __imag__ x) / den; + } + + return res; +} +weak_alias (__ctanh, ctanh) +#ifdef NO_LONG_DOUBLE +strong_alias (__ctanh, __ctanhl) +weak_alias (__ctanh, ctanhl) +#endif |