1/* Macros for not-a-number. 2 Copyright (C) 2007-2010 Free Software Foundation, Inc. 3 4 This program is free software: you can redistribute it and/or modify 5 it under the terms of the GNU General Public License as published by 6 the Free Software Foundation; either version 3 of the License, or 7 (at your option) any later version. 8 9 This program is distributed in the hope that it will be useful, 10 but WITHOUT ANY WARRANTY; without even the implied warranty of 11 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the 12 GNU General Public License for more details. 13 14 You should have received a copy of the GNU General Public License 15 along with this program. If not, see <http://www.gnu.org/licenses/>. */ 16 17 18/* NaNf () returns a 'float' not-a-number. */ 19 20/* The Compaq (ex-DEC) C 6.4 compiler chokes on the expression 0.0 / 0.0. */ 21#ifdef __DECC 22static float 23NaNf () 24{ 25 static float zero = 0.0f; 26 return zero / zero; 27} 28#else 29# define NaNf() (0.0f / 0.0f) 30#endif 31 32 33/* NaNd () returns a 'double' not-a-number. */ 34 35/* The Compaq (ex-DEC) C 6.4 compiler chokes on the expression 0.0 / 0.0. */ 36#ifdef __DECC 37static double 38NaNd () 39{ 40 static double zero = 0.0; 41 return zero / zero; 42} 43#else 44# define NaNd() (0.0 / 0.0) 45#endif 46 47 48/* NaNl () returns a 'long double' not-a-number. */ 49 50/* On Irix 6.5, gcc 3.4.3 can't compute compile-time NaN, and needs the 51 runtime type conversion. */ 52#ifdef __sgi 53static long double NaNl () 54{ 55 double zero = 0.0; 56 return zero / zero; 57} 58#else 59# define NaNl() (0.0L / 0.0L) 60#endif 61