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 * This program is free software; you can distribute it and/or modify it 9 * under the terms of the GNU General Public License (Version 2) as 10 * published by the Free Software Foundation. 11 * 12 * This program is distributed in the hope it will be useful, but WITHOUT 13 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or 14 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License 15 * for more details. 16 * 17 * You should have received a copy of the GNU General Public License along 18 * with this program; if not, write to the Free Software Foundation, Inc., 19 * 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA. 20 */ 21 22 #include "ieee754sp.h" 23 #include "ieee754dp.h" 24 25 union ieee754dp ieee754dp_fsp(union ieee754sp x) 26 { 27 COMPXSP; 28 29 EXPLODEXSP; 30 31 ieee754_clearcx(); 32 33 FLUSHXSP; 34 35 switch (xc) { 36 case IEEE754_CLASS_SNAN: 37 ieee754_setcx(IEEE754_INVALID_OPERATION); 38 return ieee754dp_nanxcpt(ieee754dp_indef()); 39 40 case IEEE754_CLASS_QNAN: 41 return ieee754dp_nanxcpt(builddp(xs, 42 DP_EMAX + 1 + DP_EBIAS, 43 ((u64) xm 44 << (DP_FBITS - 45 SP_FBITS)))); 46 case IEEE754_CLASS_INF: 47 return ieee754dp_inf(xs); 48 49 case IEEE754_CLASS_ZERO: 50 return ieee754dp_zero(xs); 51 52 case IEEE754_CLASS_DNORM: 53 /* normalize */ 54 while ((xm >> SP_FBITS) == 0) { 55 xm <<= 1; 56 xe--; 57 } 58 break; 59 60 case IEEE754_CLASS_NORM: 61 break; 62 } 63 64 /* 65 * Can't possibly overflow,underflow, or need rounding 66 */ 67 68 /* drop the hidden bit */ 69 xm &= ~SP_HIDDEN_BIT; 70 71 return builddp(xs, xe + DP_EBIAS, 72 (u64) xm << (DP_FBITS - SP_FBITS)); 73 } 74