/* Return arc hyperbole cosine for double value. Copyright (C) 1997-2016 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, see <http://www.gnu.org/licenses/>. */ #include <complex.h> #include <math.h> #include <math_private.h> __complex__ double __cacosh (__complex__ double x) { __complex__ double res; int rcls = fpclassify (__real__ x); int icls = fpclassify (__imag__ x); if (rcls <= FP_INFINITE || icls <= FP_INFINITE) { if (icls == FP_INFINITE) { __real__ res = HUGE_VAL; if (rcls == FP_NAN) __imag__ res = __nan (""); else __imag__ res = __copysign ((rcls == FP_INFINITE ? (__real__ x < 0.0 ? M_PI - M_PI_4 : M_PI_4) : M_PI_2), __imag__ x); } else if (rcls == FP_INFINITE) { __real__ res = HUGE_VAL; if (icls >= FP_ZERO) __imag__ res = __copysign (signbit (__real__ x) ? M_PI : 0.0, __imag__ x); else __imag__ res = __nan (""); } else { __real__ res = __nan (""); __imag__ res = __nan (""); } } else if (rcls == FP_ZERO && icls == FP_ZERO) { __real__ res = 0.0; __imag__ res = __copysign (M_PI_2, __imag__ x); } else { __complex__ double y; __real__ y = -__imag__ x; __imag__ y = __real__ x; y = __kernel_casinh (y, 1); if (signbit (__imag__ x)) { __real__ res = __real__ y; __imag__ res = -__imag__ y; } else { __real__ res = -__real__ y; __imag__ res = __imag__ y; } } return res; } weak_alias (__cacosh, cacosh) #ifdef NO_LONG_DOUBLE strong_alias (__cacosh, __cacoshl) weak_alias (__cacosh, cacoshl) #endif