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38db37ba MC |
1 | /* |
2 | * IEEE754 floating point arithmetic | |
3 | * double precision: CLASS.f | |
4 | * FPR[fd] = class(FPR[fs]) | |
5 | * | |
6 | * MIPS floating point support | |
7 | * Copyright (C) 2015 Imagination Technologies, Ltd. | |
8 | * Author: Markos Chandras <markos.chandras@imgtec.com> | |
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 as published by the | |
12 | * Free Software Foundation; version 2 of the License. | |
13 | */ | |
14 | ||
15 | #include "ieee754dp.h" | |
16 | ||
17 | int ieee754dp_2008class(union ieee754dp x) | |
18 | { | |
19 | COMPXDP; | |
20 | ||
21 | EXPLODEXDP; | |
22 | ||
23 | /* | |
24 | * 10 bit mask as follows: | |
25 | * | |
26 | * bit0 = SNAN | |
27 | * bit1 = QNAN | |
28 | * bit2 = -INF | |
29 | * bit3 = -NORM | |
30 | * bit4 = -DNORM | |
31 | * bit5 = -ZERO | |
32 | * bit6 = INF | |
33 | * bit7 = NORM | |
34 | * bit8 = DNORM | |
35 | * bit9 = ZERO | |
36 | */ | |
37 | ||
38 | switch(xc) { | |
39 | case IEEE754_CLASS_SNAN: | |
40 | return 0x01; | |
41 | case IEEE754_CLASS_QNAN: | |
42 | return 0x02; | |
43 | case IEEE754_CLASS_INF: | |
44 | return 0x04 << (xs ? 0 : 4); | |
45 | case IEEE754_CLASS_NORM: | |
46 | return 0x08 << (xs ? 0 : 4); | |
47 | case IEEE754_CLASS_DNORM: | |
48 | return 0x10 << (xs ? 0 : 4); | |
49 | case IEEE754_CLASS_ZERO: | |
50 | return 0x20 << (xs ? 0 : 4); | |
51 | default: | |
52 | pr_err("Unknown class: %d\n", xc); | |
53 | return 0; | |
54 | } | |
55 | } |