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 * 8 * ######################################################################## 9 * 10 * This program is free software; you can distribute it and/or modify it 11 * under the terms of the GNU General Public License (Version 2) as 12 * published by the Free Software Foundation. 13 * 14 * This program is distributed in the hope it will be useful, but WITHOUT 15 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or 16 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License 17 * for more details. 18 * 19 * You should have received a copy of the GNU General Public License along 20 * with this program; if not, write to the Free Software Foundation, Inc., 21 * 59 Temple Place - Suite 330, Boston MA 02111-1307, USA. 22 * 23 * ######################################################################## 24 */ 25 26 27 #include "ieee754dp.h" 28 ieee754dp_logb(ieee754dp x)29ieee754dp ieee754dp_logb(ieee754dp x) 30 { 31 COMPXDP; 32 33 CLEARCX; 34 35 EXPLODEXDP; 36 37 switch (xc) { 38 case IEEE754_CLASS_SNAN: 39 return ieee754dp_nanxcpt(x, "logb", x); 40 case IEEE754_CLASS_QNAN: 41 return x; 42 case IEEE754_CLASS_INF: 43 return ieee754dp_inf(0); 44 case IEEE754_CLASS_ZERO: 45 return ieee754dp_inf(1); 46 case IEEE754_CLASS_DNORM: 47 DPDNORMX; 48 break; 49 case IEEE754_CLASS_NORM: 50 break; 51 } 52 return ieee754dp_fint(xe); 53 } 54