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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 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 "ieee754sp.h" | |
28 | ||
29 | int ieee754sp_finite(ieee754sp x) | |
30 | { | |
31 | return SPBEXP(x) != SP_EMAX + 1 + SP_EBIAS; | |
32 | } | |
33 | ||
34 | ieee754sp ieee754sp_copysign(ieee754sp x, ieee754sp y) | |
35 | { | |
36 | CLEARCX; | |
37 | SPSIGN(x) = SPSIGN(y); | |
38 | return x; | |
39 | } | |
40 | ||
41 | ||
42 | ieee754sp ieee754sp_neg(ieee754sp x) | |
43 | { | |
44 | COMPXSP; | |
45 | ||
46 | EXPLODEXSP; | |
47 | CLEARCX; | |
48 | FLUSHXSP; | |
49 | ||
c5033d78 AN |
50 | /* |
51 | * Invert the sign ALWAYS to prevent an endless recursion on | |
52 | * pow() in libc. | |
53 | */ | |
54 | /* quick fix up */ | |
55 | SPSIGN(x) ^= 1; | |
56 | ||
1da177e4 | 57 | if (xc == IEEE754_CLASS_SNAN) { |
c5033d78 | 58 | ieee754sp y = ieee754sp_indef(); |
1da177e4 | 59 | SETCX(IEEE754_INVALID_OPERATION); |
c5033d78 AN |
60 | SPSIGN(y) = SPSIGN(x); |
61 | return ieee754sp_nanxcpt(y, "neg"); | |
1da177e4 LT |
62 | } |
63 | ||
1da177e4 LT |
64 | return x; |
65 | } | |
66 | ||
67 | ||
68 | ieee754sp ieee754sp_abs(ieee754sp x) | |
69 | { | |
70 | COMPXSP; | |
71 | ||
72 | EXPLODEXSP; | |
73 | CLEARCX; | |
74 | FLUSHXSP; | |
75 | ||
cea2be44 NS |
76 | /* Clear sign ALWAYS, irrespective of NaN */ |
77 | SPSIGN(x) = 0; | |
78 | ||
1da177e4 | 79 | if (xc == IEEE754_CLASS_SNAN) { |
e48682dd | 80 | SETCX(IEEE754_INVALID_OPERATION); |
1da177e4 LT |
81 | return ieee754sp_nanxcpt(ieee754sp_indef(), "abs"); |
82 | } | |
83 | ||
1da177e4 LT |
84 | return x; |
85 | } |