Merge branch 'for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/dtor/input
[linux-btrfs-devel.git] / arch / mips / math-emu / sp_flong.c
blob16a651f2986544c489d6a5db0a06ac5a4543cc66
1 /* IEEE754 floating point arithmetic
2 * single precision
3 */
4 /*
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
17 * for more details.
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 "ieee754sp.h"
29 ieee754sp ieee754sp_flong(s64 x)
31 u64 xm; /* <--- need 64-bit mantissa temp */
32 int xe;
33 int xs;
35 CLEARCX;
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);
44 xs = (x < 0);
45 if (xs) {
46 if (x == (1ULL << 63))
47 xm = (1ULL << 63); /* max neg can't be safely negated */
48 else
49 xm = -x;
50 } else {
51 xm = x;
53 xe = SP_MBITS + 3;
55 if (xm >> (SP_MBITS + 1 + 3)) {
56 /* shunt out overflow bits
58 while (xm >> (SP_MBITS + 1 + 3)) {
59 SPXSRSX1();
61 } else {
62 /* normalize in grs extended single precision */
63 while ((xm >> (SP_MBITS + 3)) == 0) {
64 xm <<= 1;
65 xe--;
68 SPNORMRET1(xs, xe, xm, "sp_flong", x);
72 ieee754sp ieee754sp_fulong(u64 u)
74 if ((s64) u < 0)
75 return ieee754sp_add(ieee754sp_1e63(),
76 ieee754sp_flong(u & ~(1ULL << 63)));
77 return ieee754sp_flong(u);