1*627f7eb2Smrg /* Return cosine of a complex type. 2*627f7eb2Smrg Copyright (C) 1997-2018 Free Software Foundation, Inc. 3*627f7eb2Smrg This file is part of the GNU C Library. 4*627f7eb2Smrg Contributed by Ulrich Drepper <drepper@cygnus.com>, 1997. 5*627f7eb2Smrg 6*627f7eb2Smrg The GNU C Library is free software; you can redistribute it and/or 7*627f7eb2Smrg modify it under the terms of the GNU Lesser General Public 8*627f7eb2Smrg License as published by the Free Software Foundation; either 9*627f7eb2Smrg version 2.1 of the License, or (at your option) any later version. 10*627f7eb2Smrg 11*627f7eb2Smrg The GNU C Library is distributed in the hope that it will be useful, 12*627f7eb2Smrg but WITHOUT ANY WARRANTY; without even the implied warranty of 13*627f7eb2Smrg MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU 14*627f7eb2Smrg Lesser General Public License for more details. 15*627f7eb2Smrg 16*627f7eb2Smrg You should have received a copy of the GNU Lesser General Public 17*627f7eb2Smrg License along with the GNU C Library; if not, see 18*627f7eb2Smrg <http://www.gnu.org/licenses/>. */ 19*627f7eb2Smrg 20*627f7eb2Smrg #include "quadmath-imp.h" 21*627f7eb2Smrg 22*627f7eb2Smrg __complex128 cacosq(__complex128 x)23*627f7eb2Smrgcacosq (__complex128 x) 24*627f7eb2Smrg { 25*627f7eb2Smrg __complex128 y; 26*627f7eb2Smrg __complex128 res; 27*627f7eb2Smrg int rcls = fpclassifyq (__real__ x); 28*627f7eb2Smrg int icls = fpclassifyq (__imag__ x); 29*627f7eb2Smrg 30*627f7eb2Smrg if (rcls <= QUADFP_INFINITE || icls <= QUADFP_INFINITE 31*627f7eb2Smrg || (rcls == QUADFP_ZERO && icls == QUADFP_ZERO)) 32*627f7eb2Smrg { 33*627f7eb2Smrg y = casinq (x); 34*627f7eb2Smrg 35*627f7eb2Smrg __real__ res = (__float128) M_PI_2q - __real__ y; 36*627f7eb2Smrg if (__real__ res == 0) 37*627f7eb2Smrg __real__ res = 0; 38*627f7eb2Smrg __imag__ res = -__imag__ y; 39*627f7eb2Smrg } 40*627f7eb2Smrg else 41*627f7eb2Smrg { 42*627f7eb2Smrg __real__ y = -__imag__ x; 43*627f7eb2Smrg __imag__ y = __real__ x; 44*627f7eb2Smrg 45*627f7eb2Smrg y = __quadmath_kernel_casinhq (y, 1); 46*627f7eb2Smrg 47*627f7eb2Smrg __real__ res = __imag__ y; 48*627f7eb2Smrg __imag__ res = __real__ y; 49*627f7eb2Smrg } 50*627f7eb2Smrg 51*627f7eb2Smrg return res; 52*627f7eb2Smrg } 53