mirror of
https://github.com/edk2-porting/linux-next.git
synced 2024-12-25 13:43:55 +08:00
38db37ba06
MIPS R6 introduced the following instruction: Stores in fd a bit mask reflecting the floating-point class of the floating point scalar value fs. CLASS.fmt: FPR[fd] = class(FPR[fs]) Signed-off-by: Markos Chandras <markos.chandras@imgtec.com> Cc: linux-mips@linux-mips.org Patchwork: https://patchwork.linux-mips.org/patch/10959/ Signed-off-by: Ralf Baechle <ralf@linux-mips.org>
56 lines
1.1 KiB
C
56 lines
1.1 KiB
C
/*
|
|
* 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;
|
|
}
|
|
}
|