1 /* Return arc hyperbolic sine for a complex float type. 2 Copyright (C) 1997-2022 Free Software Foundation, Inc. 3 This file is part of the GNU C Library. 4 5 The GNU C Library is free software; you can redistribute it and/or 6 modify it under the terms of the GNU Lesser General Public 7 License as published by the Free Software Foundation; either 8 version 2.1 of the License, or (at your option) any later version. 9 10 The GNU C Library is distributed in the hope that it will be useful, 11 but WITHOUT ANY WARRANTY; without even the implied warranty of 12 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU 13 Lesser General Public License for more details. 14 15 You should have received a copy of the GNU Lesser General Public 16 License along with the GNU C Library; if not, see 17 <https://www.gnu.org/licenses/>. */ 18 19 #include <complex.h> 20 #include <math.h> 21 22 CFLOAT M_DECL_FUNC(__casinh)23M_DECL_FUNC (__casinh) (CFLOAT x) 24 { 25 CFLOAT res; 26 int rcls = fpclassify (__real__ x); 27 int icls = fpclassify (__imag__ x); 28 29 if (rcls <= FP_INFINITE || icls <= FP_INFINITE) 30 { 31 if (icls == FP_INFINITE) 32 { 33 __real__ res = M_COPYSIGN (M_HUGE_VAL, __real__ x); 34 35 if (rcls == FP_NAN) 36 __imag__ res = M_NAN; 37 else 38 __imag__ res = M_COPYSIGN ((rcls >= FP_ZERO 39 ? M_MLIT (M_PI_2) : M_MLIT (M_PI_4)), 40 __imag__ x); 41 } 42 else if (rcls <= FP_INFINITE) 43 { 44 __real__ res = __real__ x; 45 if ((rcls == FP_INFINITE && icls >= FP_ZERO) 46 || (rcls == FP_NAN && icls == FP_ZERO)) 47 __imag__ res = M_COPYSIGN (0, __imag__ x); 48 else 49 __imag__ res = M_NAN; 50 } 51 else 52 { 53 __real__ res = M_NAN; 54 __imag__ res = M_NAN; 55 } 56 } 57 else if (rcls == FP_ZERO && icls == FP_ZERO) 58 { 59 res = x; 60 } 61 else 62 { 63 res = M_SUF (__kernel_casinh) (x, 0); 64 } 65 66 return res; 67 } 68 69 declare_mgen_alias (__casinh, casinh) 70