1*81418a27Smrg /* Return cosine of a complex type. 2*81418a27Smrg Copyright (C) 1997-2018 Free Software Foundation, Inc. 3*81418a27Smrg This file is part of the GNU C Library. 4*81418a27Smrg Contributed by Ulrich Drepper <drepper@cygnus.com>, 1997. 5*81418a27Smrg 6*81418a27Smrg The GNU C Library is free software; you can redistribute it and/or 7*81418a27Smrg modify it under the terms of the GNU Lesser General Public 8*81418a27Smrg License as published by the Free Software Foundation; either 9*81418a27Smrg version 2.1 of the License, or (at your option) any later version. 10*81418a27Smrg 11*81418a27Smrg The GNU C Library is distributed in the hope that it will be useful, 12*81418a27Smrg but WITHOUT ANY WARRANTY; without even the implied warranty of 13*81418a27Smrg MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU 14*81418a27Smrg Lesser General Public License for more details. 15*81418a27Smrg 16*81418a27Smrg You should have received a copy of the GNU Lesser General Public 17*81418a27Smrg License along with the GNU C Library; if not, see 18*81418a27Smrg <http://www.gnu.org/licenses/>. */ 19*81418a27Smrg 20*81418a27Smrg #include "quadmath-imp.h" 21*81418a27Smrg 22*81418a27Smrg __complex128 cacosq(__complex128 x)23*81418a27Smrgcacosq (__complex128 x) 24*81418a27Smrg { 25*81418a27Smrg __complex128 y; 26*81418a27Smrg __complex128 res; 27*81418a27Smrg int rcls = fpclassifyq (__real__ x); 28*81418a27Smrg int icls = fpclassifyq (__imag__ x); 29*81418a27Smrg 30*81418a27Smrg if (rcls <= QUADFP_INFINITE || icls <= QUADFP_INFINITE 31*81418a27Smrg || (rcls == QUADFP_ZERO && icls == QUADFP_ZERO)) 32*81418a27Smrg { 33*81418a27Smrg y = casinq (x); 34*81418a27Smrg 35*81418a27Smrg __real__ res = (__float128) M_PI_2q - __real__ y; 36*81418a27Smrg if (__real__ res == 0) 37*81418a27Smrg __real__ res = 0; 38*81418a27Smrg __imag__ res = -__imag__ y; 39*81418a27Smrg } 40*81418a27Smrg else 41*81418a27Smrg { 42*81418a27Smrg __real__ y = -__imag__ x; 43*81418a27Smrg __imag__ y = __real__ x; 44*81418a27Smrg 45*81418a27Smrg y = __quadmath_kernel_casinhq (y, 1); 46*81418a27Smrg 47*81418a27Smrg __real__ res = __imag__ y; 48*81418a27Smrg __imag__ res = __real__ y; 49*81418a27Smrg } 50*81418a27Smrg 51*81418a27Smrg return res; 52*81418a27Smrg } 53