1 /* IEEE754 floating point arithmetic 2 * single precision 3 */ 4 /* 5 * MIPS floating point support 6 * Copyright (C) 1994-2000 Algorithmics Ltd. 7 * http://www.algor.co.uk 8 * 9 * ######################################################################## 10 * 11 * This program is free software; you can distribute it and/or modify it 12 * under the terms of the GNU General Public License (Version 2) as 13 * published by the Free Software Foundation. 14 * 15 * This program is distributed in the hope it will be useful, but WITHOUT 16 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or 17 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License 18 * for more details. 19 * 20 * You should have received a copy of the GNU General Public License along 21 * with this program; if not, write to the Free Software Foundation, Inc., 22 * 59 Temple Place - Suite 330, Boston MA 02111-1307, USA. 23 * 24 * ######################################################################## 25 */ 26 27 28 #include "ieee754sp.h" 29 30 ieee754sp ieee754sp_flong(s64 x) 31 { 32 COMPXDP; /* <--- need 64-bit mantissa temp */ 33 34 CLEARCX; 35 36 if (x == 0) 37 return ieee754sp_zero(0); 38 if (x == 1 || x == -1) 39 return ieee754sp_one(x < 0); 40 if (x == 10 || x == -10) 41 return ieee754sp_ten(x < 0); 42 43 xs = (x < 0); 44 if (xs) { 45 if (x == (1ULL << 63)) 46 xm = (1ULL << 63); /* max neg can't be safely negated */ 47 else 48 xm = -x; 49 } else { 50 xm = x; 51 } 52 xe = SP_MBITS + 3; 53 54 if (xm >> (SP_MBITS + 1 + 3)) { 55 /* shunt out overflow bits 56 */ 57 while (xm >> (SP_MBITS + 1 + 3)) { 58 SPXSRSX1(); 59 } 60 } else { 61 /* normalize in grs extended single precision */ 62 while ((xm >> (SP_MBITS + 3)) == 0) { 63 xm <<= 1; 64 xe--; 65 } 66 } 67 SPNORMRET1(xs, xe, xm, "sp_flong", x); 68 } 69 70 71 ieee754sp ieee754sp_fulong(u64 u) 72 { 73 if ((s64) u < 0) 74 return ieee754sp_add(ieee754sp_1e63(), 75 ieee754sp_flong(u & ~(1ULL << 63))); 76 return ieee754sp_flong(u); 77 } 78