Commit | Line | Data |
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1da177e4 LT |
1 | /* IEEE754 floating point arithmetic |
2 | * double precision: common utilities | |
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 | ||
b3a7ad2b | 22 | #include "ieee754sp.h" |
1da177e4 LT |
23 | #include "ieee754dp.h" |
24 | ||
d19cf86e MR |
25 | static inline union ieee754dp ieee754dp_nan_fsp(int xs, u64 xm) |
26 | { | |
27 | return builddp(xs, DP_EMAX + 1 + DP_EBIAS, | |
28 | xm << (DP_FBITS - SP_FBITS)); | |
29 | } | |
30 | ||
2209bcb1 | 31 | union ieee754dp ieee754dp_fsp(union ieee754sp x) |
1da177e4 LT |
32 | { |
33 | COMPXSP; | |
34 | ||
35 | EXPLODEXSP; | |
36 | ||
9e8bad1f | 37 | ieee754_clearcx(); |
1da177e4 LT |
38 | |
39 | FLUSHXSP; | |
40 | ||
41 | switch (xc) { | |
42 | case IEEE754_CLASS_SNAN: | |
9e8bad1f | 43 | ieee754_setcx(IEEE754_INVALID_OPERATION); |
90efba36 | 44 | return ieee754dp_nanxcpt(ieee754dp_indef()); |
3f7cac41 | 45 | |
1da177e4 | 46 | case IEEE754_CLASS_QNAN: |
d19cf86e MR |
47 | return ieee754dp_nanxcpt(ieee754dp_nan_fsp(xs, xm)); |
48 | ||
1da177e4 LT |
49 | case IEEE754_CLASS_INF: |
50 | return ieee754dp_inf(xs); | |
3f7cac41 | 51 | |
1da177e4 LT |
52 | case IEEE754_CLASS_ZERO: |
53 | return ieee754dp_zero(xs); | |
3f7cac41 | 54 | |
1da177e4 LT |
55 | case IEEE754_CLASS_DNORM: |
56 | /* normalize */ | |
ad8fb553 | 57 | while ((xm >> SP_FBITS) == 0) { |
1da177e4 LT |
58 | xm <<= 1; |
59 | xe--; | |
60 | } | |
61 | break; | |
3f7cac41 | 62 | |
1da177e4 LT |
63 | case IEEE754_CLASS_NORM: |
64 | break; | |
65 | } | |
66 | ||
3f7cac41 RB |
67 | /* |
68 | * Can't possibly overflow,underflow, or need rounding | |
1da177e4 LT |
69 | */ |
70 | ||
71 | /* drop the hidden bit */ | |
72 | xm &= ~SP_HIDDEN_BIT; | |
73 | ||
74 | return builddp(xs, xe + DP_EBIAS, | |
ad8fb553 | 75 | (u64) xm << (DP_FBITS - SP_FBITS)); |
1da177e4 | 76 | } |