signbitl.c revision 169692
1/* Return nonzero value if number is negative. */ 2 3/* Copyright (C) 1997, 1998, 1999 Free Software Foundation, Inc. 4 5 This file is part of the GNU ISO C++ Library. This library is free 6 software; you can redistribute it and/or modify it under the 7 terms of the GNU General Public License as published by the 8 Free Software Foundation; either version 2, or (at your option) 9 any later version. 10 11 This 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 14 GNU General Public License for more details. 15 16 You should have received a copy of the GNU General Public License along 17 with this library; see the file COPYING. If not, write to the Free 18 Software Foundation, 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, 19 USA. 20 21 As a special exception, you may use this file as part of a free software 22 library without restriction. Specifically, if other files instantiate 23 templates or use macros or inline functions from this file, or you compile 24 this file and link it with other files to produce an executable, this 25 file does not by itself cause the resulting executable to be covered by 26 the GNU General Public License. This exception does not however 27 invalidate any other reasons why the executable file might be covered by 28 the GNU General Public License. */ 29 30#include <float.h> 31#include <math.h> 32#include "mathconf.h" 33 34int 35__signbitl (long double x) 36{ 37#if LDBL_MANT_DIG == 113 38 Int64_t msw; 39 40 GET_LDOUBLE_MSW64 (msw, x); 41 return msw < 0; 42#else 43 Int32_t e; 44 45 GET_LDOUBLE_EXP (e, x); 46 return e & 0x8000; 47#endif 48} 49