Commit | Line | Data |
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1da177e4 LT |
1 | /* IEEE754 floating point arithmetic |
2 | * single precision | |
3 | */ | |
4 | /* | |
5 | * MIPS floating point support | |
6 | * Copyright (C) 1994-2000 Algorithmics Ltd. | |
1da177e4 | 7 | * |
1da177e4 LT |
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., | |
3f7cac41 | 19 | * 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA. |
1da177e4 LT |
20 | */ |
21 | ||
1da177e4 LT |
22 | #include "ieee754sp.h" |
23 | ||
2209bcb1 | 24 | union ieee754sp ieee754sp_flong(s64 x) |
1da177e4 | 25 | { |
ecf52d3c AN |
26 | u64 xm; /* <--- need 64-bit mantissa temp */ |
27 | int xe; | |
28 | int xs; | |
1da177e4 | 29 | |
9e8bad1f | 30 | ieee754_clearcx(); |
1da177e4 | 31 | |
1da177e4 LT |
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 == (1ULL << 63)) | |
42 | xm = (1ULL << 63); /* max neg can't be safely negated */ | |
43 | else | |
44 | xm = -x; | |
45 | } else { | |
46 | xm = x; | |
47 | } | |
ad8fb553 | 48 | xe = SP_FBITS + 3; |
1da177e4 | 49 | |
ad8fb553 | 50 | if (xm >> (SP_FBITS + 1 + 3)) { |
1da177e4 LT |
51 | /* shunt out overflow bits |
52 | */ | |
ad8fb553 | 53 | while (xm >> (SP_FBITS + 1 + 3)) { |
1da177e4 LT |
54 | SPXSRSX1(); |
55 | } | |
56 | } else { | |
57 | /* normalize in grs extended single precision */ | |
ad8fb553 | 58 | while ((xm >> (SP_FBITS + 3)) == 0) { |
1da177e4 LT |
59 | xm <<= 1; |
60 | xe--; | |
61 | } | |
62 | } | |
90efba36 | 63 | return ieee754sp_format(xs, xe, xm); |
1da177e4 | 64 | } |