1 /* IEEE754 floating point arithmetic 2 * single precision 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 "ieee754sp.h" 28 29 union ieee754sp ieee754sp_fint(int x) 30 { 31 unsigned xm; 32 int xe; 33 int xs; 34 35 ieee754_clearcx(); 36 37 if (x == 0) 38 return ieee754sp_zero(0); 39 if (x == 1 || x == -1) 40 return ieee754sp_one(x < 0); 41 if (x == 10 || x == -10) 42 return ieee754sp_ten(x < 0); 43 44 xs = (x < 0); 45 if (xs) { 46 if (x == (1 << 31)) 47 xm = ((unsigned) 1 << 31); /* max neg can't be safely negated */ 48 else 49 xm = -x; 50 } else { 51 xm = x; 52 } 53 xe = SP_FBITS + 3; 54 55 if (xm >> (SP_FBITS + 1 + 3)) { 56 /* shunt out overflow bits 57 */ 58 while (xm >> (SP_FBITS + 1 + 3)) { 59 SPXSRSX1(); 60 } 61 } else { 62 /* normalize in grs extended single precision 63 */ 64 while ((xm >> (SP_FBITS + 3)) == 0) { 65 xm <<= 1; 66 xe--; 67 } 68 } 69 SPNORMRET1(xs, xe, xm, "fint", x); 70 } 71