53 lines
974 B
C
53 lines
974 B
C
|
// 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;
|
||
|
|
}
|
||
|
|
}
|