1 /* 2 * IEEE754 floating point arithmetic 3 * single precision: CLASS.f 4 * FPR[fd] = class(FPR[fs]) 5 * 6 * MIPS floating point support 7 * Copyright (C) 2015 Imagination Technologies, Ltd. 8 * Author: Markos Chandras <markos.chandras@imgtec.com> 9 * 10 * This program is free software; you can distribute it and/or modify it 11 * under the terms of the GNU General Public License as published by the 12 * Free Software Foundation; version 2 of the License. 13 */ 14 15 #include "ieee754sp.h" 16 17 int ieee754sp_2008class(union ieee754sp x) 18 { 19 COMPXSP; 20 21 EXPLODEXSP; 22 23 /* 24 * 10 bit mask as follows: 25 * 26 * bit0 = SNAN 27 * bit1 = QNAN 28 * bit2 = -INF 29 * bit3 = -NORM 30 * bit4 = -DNORM 31 * bit5 = -ZERO 32 * bit6 = INF 33 * bit7 = NORM 34 * bit8 = DNORM 35 * bit9 = ZERO 36 */ 37 38 switch(xc) { 39 case IEEE754_CLASS_SNAN: 40 return 0x01; 41 case IEEE754_CLASS_QNAN: 42 return 0x02; 43 case IEEE754_CLASS_INF: 44 return 0x04 << (xs ? 0 : 4); 45 case IEEE754_CLASS_NORM: 46 return 0x08 << (xs ? 0 : 4); 47 case IEEE754_CLASS_DNORM: 48 return 0x10 << (xs ? 0 : 4); 49 case IEEE754_CLASS_ZERO: 50 return 0x20 << (xs ? 0 : 4); 51 default: 52 pr_err("Unknown class: %d\n", xc); 53 return 0; 54 } 55 } 56