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