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