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[/] [openrisc/] [trunk/] [gnu-stable/] [newlib-1.18.0/] [newlib/] [libc/] [sys/] [linux/] [cmath/] [s_ctanl.c] - Rev 859
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/* Complex tangent function for long 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 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__ long double __ctanl (__complex__ long double x) { __complex__ long double res; if (!isfinite (__real__ x) || !isfinite (__imag__ x)) { if (__isinfl (__imag__ x)) { __real__ res = __copysignl (0.0, __real__ x); __imag__ res = __copysignl (1.0, __imag__ x); } else if (__real__ x == 0.0) { res = x; } else { __real__ res = __nanl (""); __imag__ res = __nanl (""); #ifdef FE_INVALID if (__isinfl (__real__ x)) feraiseexcept (FE_INVALID); #endif } } else { long double sin2rx, cos2rx; long double den; __sincosl (2.0 * __real__ x, &sin2rx, &cos2rx); den = cos2rx + __ieee754_coshl (2.0 * __imag__ x); __real__ res = sin2rx / den; __imag__ res = __ieee754_sinhl (2.0 * __imag__ x) / den; } return res; } weak_alias (__ctanl, ctanl)
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