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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. | |
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 "ieee754dp.h" | |
29 | ||
30 | int ieee754dp_finite(ieee754dp x) | |
31 | { | |
32 | return DPBEXP(x) != DP_EMAX + 1 + DP_EBIAS; | |
33 | } | |
34 | ||
35 | ieee754dp ieee754dp_copysign(ieee754dp x, ieee754dp y) | |
36 | { | |
37 | CLEARCX; | |
38 | DPSIGN(x) = DPSIGN(y); | |
39 | return x; | |
40 | } | |
41 | ||
42 | ||
43 | ieee754dp ieee754dp_neg(ieee754dp x) | |
44 | { | |
45 | COMPXDP; | |
46 | ||
47 | EXPLODEXDP; | |
48 | CLEARCX; | |
49 | FLUSHXDP; | |
50 | ||
c5033d78 AN |
51 | /* |
52 | * Invert the sign ALWAYS to prevent an endless recursion on | |
53 | * pow() in libc. | |
54 | */ | |
55 | /* quick fix up */ | |
56 | DPSIGN(x) ^= 1; | |
57 | ||
1da177e4 | 58 | if (xc == IEEE754_CLASS_SNAN) { |
c5033d78 | 59 | ieee754dp y = ieee754dp_indef(); |
1da177e4 | 60 | SETCX(IEEE754_INVALID_OPERATION); |
c5033d78 AN |
61 | DPSIGN(y) = DPSIGN(x); |
62 | return ieee754dp_nanxcpt(y, "neg"); | |
1da177e4 LT |
63 | } |
64 | ||
1da177e4 LT |
65 | return x; |
66 | } | |
67 | ||
68 | ||
69 | ieee754dp ieee754dp_abs(ieee754dp x) | |
70 | { | |
71 | COMPXDP; | |
72 | ||
73 | EXPLODEXDP; | |
74 | CLEARCX; | |
75 | FLUSHXDP; | |
76 | ||
cea2be44 NS |
77 | /* Clear sign ALWAYS, irrespective of NaN */ |
78 | DPSIGN(x) = 0; | |
79 | ||
1da177e4 | 80 | if (xc == IEEE754_CLASS_SNAN) { |
cea2be44 | 81 | return ieee754dp_nanxcpt(ieee754dp_indef(), "abs"); |
1da177e4 LT |
82 | } |
83 | ||
1da177e4 LT |
84 | return x; |
85 | } |