| b.liu | e958203 | 2025-04-17 19:18:16 +0800 | [diff] [blame^] | 1 | // SPDX-License-Identifier: GPL-2.0-only |
| 2 | /* |
| 3 | * IEEE754 floating point arithmetic |
| 4 | * single 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 "ieee754sp.h" |
| 13 | |
| 14 | int ieee754sp_2008class(union ieee754sp x) |
| 15 | { |
| 16 | COMPXSP; |
| 17 | |
| 18 | EXPLODEXSP; |
| 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 | } |