/* 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