1 /* Compute projection of complex float type value to Riemann sphere. 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 23 cprojq (__complex128 x) 24 { 25 if (isinfq (__real__ x) || isinfq (__imag__ x)) 26 { 27 __complex128 res; 28 29 __real__ res = __builtin_inf (); 30 __imag__ res = copysignq (0, __imag__ x); 31 32 return res; 33 } 34 35 return x; 36 } 37