mirror of
https://github.com/edk2-porting/linux-next.git
synced 2024-12-29 23:53:55 +08:00
3f7cac416b
o Only define variables in the outermost block o One empty line at most o Format comments as per CodingStyle o Update FSF address in licensing term comment o Spell FPU and MIPS in all capitals. o Remove ####-type of lines in comments. o Try to make things a bit most consistent between sp_*.c / dp_*.c files. Signed-off-by: Ralf Baechle <ralf@linux-mips.org>
74 lines
1.7 KiB
C
74 lines
1.7 KiB
C
/* IEEE754 floating point arithmetic
|
|
* double precision: common utilities
|
|
*/
|
|
/*
|
|
* MIPS floating point support
|
|
* Copyright (C) 1994-2000 Algorithmics Ltd.
|
|
*
|
|
* This program is free software; you can distribute it and/or modify it
|
|
* under the terms of the GNU General Public License (Version 2) as
|
|
* published by the Free Software Foundation.
|
|
*
|
|
* This program is distributed in the hope it will be useful, but WITHOUT
|
|
* ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
|
|
* FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
|
|
* for more details.
|
|
*
|
|
* You should have received a copy of the GNU General Public License along
|
|
* with this program; if not, write to the Free Software Foundation, Inc.,
|
|
* 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
|
|
*/
|
|
|
|
#include "ieee754sp.h"
|
|
#include "ieee754dp.h"
|
|
|
|
union ieee754dp ieee754dp_fsp(union ieee754sp x)
|
|
{
|
|
COMPXSP;
|
|
|
|
EXPLODEXSP;
|
|
|
|
ieee754_clearcx();
|
|
|
|
FLUSHXSP;
|
|
|
|
switch (xc) {
|
|
case IEEE754_CLASS_SNAN:
|
|
ieee754_setcx(IEEE754_INVALID_OPERATION);
|
|
return ieee754dp_nanxcpt(ieee754dp_indef());
|
|
|
|
case IEEE754_CLASS_QNAN:
|
|
return ieee754dp_nanxcpt(builddp(xs,
|
|
DP_EMAX + 1 + DP_EBIAS,
|
|
((u64) xm
|
|
<< (DP_FBITS -
|
|
SP_FBITS))));
|
|
case IEEE754_CLASS_INF:
|
|
return ieee754dp_inf(xs);
|
|
|
|
case IEEE754_CLASS_ZERO:
|
|
return ieee754dp_zero(xs);
|
|
|
|
case IEEE754_CLASS_DNORM:
|
|
/* normalize */
|
|
while ((xm >> SP_FBITS) == 0) {
|
|
xm <<= 1;
|
|
xe--;
|
|
}
|
|
break;
|
|
|
|
case IEEE754_CLASS_NORM:
|
|
break;
|
|
}
|
|
|
|
/*
|
|
* Can't possibly overflow,underflow, or need rounding
|
|
*/
|
|
|
|
/* drop the hidden bit */
|
|
xm &= ~SP_HIDDEN_BIT;
|
|
|
|
return builddp(xs, xe + DP_EBIAS,
|
|
(u64) xm << (DP_FBITS - SP_FBITS));
|
|
}
|