| // SPDX-License-Identifier: GPL-2.0-only |
| /* |
| * IEEE754 floating point arithmetic |
| * double precision: CLASS.f |
| * FPR[fd] = class(FPR[fs]) |
| * |
| * MIPS floating point support |
| * Copyright (C) 2015 Imagination Technologies, Ltd. |
| * Author: Markos Chandras <markos.chandras@imgtec.com> |
| */ |
| |
| #include "ieee754dp.h" |
| |
| int ieee754dp_2008class(union ieee754dp x) |
| { |
| COMPXDP; |
| |
| EXPLODEXDP; |
| |
| /* |
| * 10 bit mask as follows: |
| * |
| * bit0 = SNAN |
| * bit1 = QNAN |
| * bit2 = -INF |
| * bit3 = -NORM |
| * bit4 = -DNORM |
| * bit5 = -ZERO |
| * bit6 = INF |
| * bit7 = NORM |
| * bit8 = DNORM |
| * bit9 = ZERO |
| */ |
| |
| switch(xc) { |
| case IEEE754_CLASS_SNAN: |
| return 0x01; |
| case IEEE754_CLASS_QNAN: |
| return 0x02; |
| case IEEE754_CLASS_INF: |
| return 0x04 << (xs ? 0 : 4); |
| case IEEE754_CLASS_NORM: |
| return 0x08 << (xs ? 0 : 4); |
| case IEEE754_CLASS_DNORM: |
| return 0x10 << (xs ? 0 : 4); |
| case IEEE754_CLASS_ZERO: |
| return 0x20 << (xs ? 0 : 4); |
| default: |
| pr_err("Unknown class: %d\n", xc); |
| return 0; |
| } |
| } |
