sp_2008class.c
1.11 KB
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/*
* IEEE754 floating point arithmetic
* single 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>
*
* This program is free software; you can distribute it and/or modify it
* under the terms of the GNU General Public License as published by the
* Free Software Foundation; version 2 of the License.
*/
#include "ieee754sp.h"
int ieee754sp_2008class(union ieee754sp x)
{
COMPXSP;
EXPLODEXSP;
/*
* 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;
}
}