1/* Return arc hyperbolic cosine for 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 23cacoshq (__complex128 x) 24{ 25 __complex128 res; 26 int rcls = fpclassifyq (__real__ x); 27 int icls = fpclassifyq (__imag__ x); 28 29 if (rcls <= QUADFP_INFINITE || icls <= QUADFP_INFINITE) 30 { 31 if (icls == QUADFP_INFINITE) 32 { 33 __real__ res = HUGE_VALQ; 34 35 if (rcls == QUADFP_NAN) 36 __imag__ res = nanq (""); 37 else 38 __imag__ res = copysignq ((rcls == QUADFP_INFINITE 39 ? (__real__ x < 0 40 ? M_PIq - M_PI_4q 41 : M_PI_4q) 42 : M_PI_2q), __imag__ x); 43 } 44 else if (rcls == QUADFP_INFINITE) 45 { 46 __real__ res = HUGE_VALQ; 47 48 if (icls >= QUADFP_ZERO) 49 __imag__ res = copysignq (signbitq (__real__ x) 50 ? M_PIq : 0, __imag__ x); 51 else 52 __imag__ res = nanq (""); 53 } 54 else 55 { 56 __real__ res = nanq (""); 57 if (rcls == QUADFP_ZERO) 58 __imag__ res = M_PI_2q; 59 else 60 __imag__ res = nanq (""); 61 } 62 } 63 else if (rcls == QUADFP_ZERO && icls == QUADFP_ZERO) 64 { 65 __real__ res = 0; 66 __imag__ res = copysignq (M_PI_2q, __imag__ x); 67 } 68 else 69 { 70 __complex128 y; 71 72 __real__ y = -__imag__ x; 73 __imag__ y = __real__ x; 74 75 y = __quadmath_kernel_casinhq (y, 1); 76 77 if (signbitq (__imag__ x)) 78 { 79 __real__ res = __real__ y; 80 __imag__ res = -__imag__ y; 81 } 82 else 83 { 84 __real__ res = -__real__ y; 85 __imag__ res = __imag__ y; 86 } 87 } 88 89 return res; 90} 91