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 29 ieee754dp ieee754dp_fsp(ieee754sp x) 30 { 31 COMPXSP; 32 33 EXPLODEXSP; 34 35 CLEARCX; 36 37 FLUSHXSP; 38 39 switch (xc) { 40 case IEEE754_CLASS_SNAN: 41 SETCX(IEEE754_INVALID_OPERATION); 42 return ieee754dp_nanxcpt(ieee754dp_indef(), "fsp"); 43 case IEEE754_CLASS_QNAN: 44 return ieee754dp_nanxcpt(builddp(xs, 45 DP_EMAX + 1 + DP_EBIAS, 46 ((u64) xm 47 << (DP_MBITS - 48 SP_MBITS))), "fsp", 49 x); 50 case IEEE754_CLASS_INF: 51 return ieee754dp_inf(xs); 52 case IEEE754_CLASS_ZERO: 53 return ieee754dp_zero(xs); 54 case IEEE754_CLASS_DNORM: 55 /* normalize */ 56 while ((xm >> SP_MBITS) == 0) { 57 xm <<= 1; 58 xe--; 59 } 60 break; 61 case IEEE754_CLASS_NORM: 62 break; 63 } 64 65 /* CANT 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_MBITS - SP_MBITS)); 73 } 74