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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 | int ieee754sp_finite(ieee754sp x) | |
31 | { | |
32 | return SPBEXP(x) != SP_EMAX + 1 + SP_EBIAS; | |
33 | } | |
34 | ||
35 | ieee754sp ieee754sp_copysign(ieee754sp x, ieee754sp y) | |
36 | { | |
37 | CLEARCX; | |
38 | SPSIGN(x) = SPSIGN(y); | |
39 | return x; | |
40 | } | |
41 | ||
42 | ||
43 | ieee754sp ieee754sp_neg(ieee754sp x) | |
44 | { | |
45 | COMPXSP; | |
46 | ||
47 | EXPLODEXSP; | |
48 | CLEARCX; | |
49 | FLUSHXSP; | |
50 | ||
51 | if (xc == IEEE754_CLASS_SNAN) { | |
52 | SETCX(IEEE754_INVALID_OPERATION); | |
53 | return ieee754sp_nanxcpt(ieee754sp_indef(), "neg"); | |
54 | } | |
55 | ||
56 | if (ieee754sp_isnan(x)) /* but not infinity */ | |
57 | return ieee754sp_nanxcpt(x, "neg", x); | |
58 | ||
59 | /* quick fix up */ | |
60 | SPSIGN(x) ^= 1; | |
61 | return x; | |
62 | } | |
63 | ||
64 | ||
65 | ieee754sp ieee754sp_abs(ieee754sp x) | |
66 | { | |
67 | COMPXSP; | |
68 | ||
69 | EXPLODEXSP; | |
70 | CLEARCX; | |
71 | FLUSHXSP; | |
72 | ||
73 | if (xc == IEEE754_CLASS_SNAN) { | |
74 | SETCX(IEEE754_INVALID_OPERATION); | |
75 | return ieee754sp_nanxcpt(ieee754sp_indef(), "abs"); | |
76 | } | |
77 | ||
78 | if (ieee754sp_isnan(x)) /* but not infinity */ | |
79 | return ieee754sp_nanxcpt(x, "abs", x); | |
80 | ||
81 | /* quick fix up */ | |
82 | SPSIGN(x) = 0; | |
83 | return x; | |
84 | } |