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