1 /* Return arc sine of a complex float 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 casinq(__complex128 x)23casinq (__complex128 x) 24 { 25 __complex128 res; 26 27 if (isnanq (__real__ x) || isnanq (__imag__ x)) 28 { 29 if (__real__ x == 0) 30 { 31 res = x; 32 } 33 else if (isinfq (__real__ x) || isinfq (__imag__ x)) 34 { 35 __real__ res = nanq (""); 36 __imag__ res = copysignq (HUGE_VALQ, __imag__ x); 37 } 38 else 39 { 40 __real__ res = nanq (""); 41 __imag__ res = nanq (""); 42 } 43 } 44 else 45 { 46 __complex128 y; 47 48 __real__ y = -__imag__ x; 49 __imag__ y = __real__ x; 50 51 y = casinhq (y); 52 53 __real__ res = __imag__ y; 54 __imag__ res = -__real__ y; 55 } 56 57 return res; 58 } 59