1 /* IEEE754 floating point arithmetic
2 * double precision: common utilities
5 * MIPS floating point support
6 * Copyright (C) 1994-2000 Algorithmics Ltd.
8 * ########################################################################
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.
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
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.
23 * ########################################################################
27 #include "ieee754dp.h"
29 ieee754dp ieee754dp_flong(s64 x)
38 return ieee754dp_zero(0);
39 if (x == 1 || x == -1)
40 return ieee754dp_one(x < 0);
41 if (x == 10 || x == -10)
42 return ieee754dp_ten(x < 0);
46 if (x == (1ULL << 63))
47 xm = (1ULL << 63); /* max neg can't be safely negated */
56 if (xm >> (DP_MBITS + 1 + 3)) {
57 /* shunt out overflow bits */
58 while (xm >> (DP_MBITS + 1 + 3)) {
62 /* normalize in grs extended double precision */
63 while ((xm >> (DP_MBITS + 3)) == 0) {
68 DPNORMRET1(xs, xe, xm, "dp_flong", x);
71 ieee754dp ieee754dp_fulong(u64 u)
74 return ieee754dp_add(ieee754dp_1e63(),
75 ieee754dp_flong(u & ~(1ULL << 63)));
76 return ieee754dp_flong(u);