1 /* IEEE754 floating point arithmetic 2 * double precision: common utilities 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 "ieee754dp.h" 29 ieee754dp_logb(ieee754dp x)30ieee754dp ieee754dp_logb(ieee754dp x) 31 { 32 COMPXDP; 33 34 CLEARCX; 35 36 EXPLODEXDP; 37 38 switch (xc) { 39 case IEEE754_CLASS_SNAN: 40 return ieee754dp_nanxcpt(x, "logb", x); 41 case IEEE754_CLASS_QNAN: 42 return x; 43 case IEEE754_CLASS_INF: 44 return ieee754dp_inf(0); 45 case IEEE754_CLASS_ZERO: 46 return ieee754dp_inf(1); 47 case IEEE754_CLASS_DNORM: 48 DPDNORMX; 49 break; 50 case IEEE754_CLASS_NORM: 51 break; 52 } 53 return ieee754dp_fint(xe); 54 } 55