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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. | |
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 | ||
1da177e4 LT |
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 | } |