1/* IEEE754 floating point arithmetic 2 * single precision 3 */ 4/* 5 * MIPS floating point support 6 * Copyright (C) 1994-2000 Algorithmics Ltd. 7 * http://www.algor.co.uk 8 * 9 * ######################################################################## 10 * 11 * This program is free software; you can distribute it and/or modify it 12 * under the terms of the GNU General Public License (Version 2) as 13 * published by the Free Software Foundation. 14 * 15 * This program is distributed in the hope it will be useful, but WITHOUT 16 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or 17 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License 18 * for more details. 19 * 20 * You should have received a copy of the GNU General Public License along 21 * with this program; if not, write to the Free Software Foundation, Inc., 22 * 59 Temple Place - Suite 330, Boston MA 02111-1307, USA. 23 * 24 * ######################################################################## 25 */ 26 27 28#include "ieee754sp.h" 29 30ieee754sp ieee754sp_logb(ieee754sp x) 31{ 32 COMPXSP; 33 34 CLEARCX; 35 36 EXPLODEXSP; 37 38 switch (xc) { 39 case IEEE754_CLASS_SNAN: 40 return ieee754sp_nanxcpt(x, "logb", x); 41 case IEEE754_CLASS_QNAN: 42 return x; 43 case IEEE754_CLASS_INF: 44 return ieee754sp_inf(0); 45 case IEEE754_CLASS_ZERO: 46 return ieee754sp_inf(1); 47 case IEEE754_CLASS_DNORM: 48 SPDNORMX; 49 break; 50 case IEEE754_CLASS_NORM: 51 break; 52 } 53 return ieee754sp_fint(xe); 54} 55