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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 LT |
7 | * |
8 | * ######################################################################## | |
9 | * | |
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. | |
13 | * | |
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. | |
18 | * | |
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. | |
22 | * | |
23 | * ######################################################################## | |
24 | */ | |
25 | ||
26 | ||
27 | #include "ieee754dp.h" | |
28 | ||
29 | ieee754dp ieee754dp_fsp(ieee754sp x) | |
30 | { | |
31 | COMPXSP; | |
32 | ||
33 | EXPLODEXSP; | |
34 | ||
35 | CLEARCX; | |
36 | ||
37 | FLUSHXSP; | |
38 | ||
39 | switch (xc) { | |
40 | case IEEE754_CLASS_SNAN: | |
41 | SETCX(IEEE754_INVALID_OPERATION); | |
42 | return ieee754dp_nanxcpt(ieee754dp_indef(), "fsp"); | |
43 | case IEEE754_CLASS_QNAN: | |
44 | return ieee754dp_nanxcpt(builddp(xs, | |
45 | DP_EMAX + 1 + DP_EBIAS, | |
46 | ((u64) xm | |
47 | << (DP_MBITS - | |
48 | SP_MBITS))), "fsp", | |
49 | x); | |
50 | case IEEE754_CLASS_INF: | |
51 | return ieee754dp_inf(xs); | |
52 | case IEEE754_CLASS_ZERO: | |
53 | return ieee754dp_zero(xs); | |
54 | case IEEE754_CLASS_DNORM: | |
55 | /* normalize */ | |
56 | while ((xm >> SP_MBITS) == 0) { | |
57 | xm <<= 1; | |
58 | xe--; | |
59 | } | |
60 | break; | |
61 | case IEEE754_CLASS_NORM: | |
62 | break; | |
63 | } | |
64 | ||
25985edc | 65 | /* CAN'T possibly overflow,underflow, or need rounding |
1da177e4 LT |
66 | */ |
67 | ||
68 | /* drop the hidden bit */ | |
69 | xm &= ~SP_HIDDEN_BIT; | |
70 | ||
71 | return builddp(xs, xe + DP_EBIAS, | |
72 | (u64) xm << (DP_MBITS - SP_MBITS)); | |
73 | } |