1 // SPDX-License-Identifier: GPL-2.0-only
2 /*
3 * IEEE754 floating point arithmetic
4 * double precision: CLASS.f
5 * FPR[fd] = class(FPR[fs])
6 *
7 * MIPS floating point support
8 * Copyright (C) 2015 Imagination Technologies, Ltd.
9 * Author: Markos Chandras <markos.chandras@imgtec.com>
10 */
11
12 #include "ieee754dp.h"
13
14 int ieee754dp_2008class(union ieee754dp x)
15 {
16 COMPXDP;
17
18 EXPLODEXDP;
19
20 /*
21 * 10 bit mask as follows:
22 *
23 * bit0 = SNAN
24 * bit1 = QNAN
25 * bit2 = -INF
26 * bit3 = -NORM
27 * bit4 = -DNORM
28 * bit5 = -ZERO
29 * bit6 = INF
30 * bit7 = NORM
31 * bit8 = DNORM
32 * bit9 = ZERO
33 */
34
35 switch(xc) {
36 case IEEE754_CLASS_SNAN:
37 return 0x01;
38 case IEEE754_CLASS_QNAN:
39 return 0x02;
40 case IEEE754_CLASS_INF:
41 return 0x04 << (xs ? 0 : 4);
42 case IEEE754_CLASS_NORM:
43 return 0x08 << (xs ? 0 : 4);
44 case IEEE754_CLASS_DNORM:
45 return 0x10 << (xs ? 0 : 4);
46 case IEEE754_CLASS_ZERO:
47 return 0x20 << (xs ? 0 : 4);
48 default:
49 pr_err("Unknown class: %d\n", xc);
50 return 0;
51 }
52 }
53
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