1 /* IEEE754 floating point arithmetic 2 * single precision 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 24 union ieee754sp ieee754sp_fint(int x) 25 { 26 unsigned int xm; 27 int xe; 28 int xs; 29 30 ieee754_clearcx(); 31 32 if (x == 0) 33 return ieee754sp_zero(0); 34 if (x == 1 || x == -1) 35 return ieee754sp_one(x < 0); 36 if (x == 10 || x == -10) 37 return ieee754sp_ten(x < 0); 38 39 xs = (x < 0); 40 if (xs) { 41 if (x == (1 << 31)) 42 xm = ((unsigned) 1 << 31); /* max neg can't be safely negated */ 43 else 44 xm = -x; 45 } else { 46 xm = x; 47 } 48 xe = SP_FBITS + 3; 49 50 if (xm >> (SP_FBITS + 1 + 3)) { 51 /* shunt out overflow bits 52 */ 53 while (xm >> (SP_FBITS + 1 + 3)) { 54 SPXSRSX1(); 55 } 56 } else { 57 /* normalize in grs extended single precision 58 */ 59 while ((xm >> (SP_FBITS + 3)) == 0) { 60 xm <<= 1; 61 xe--; 62 } 63 } 64 return ieee754sp_format(xs, xe, xm); 65 } 66