2d5e7b9ffd
Just doesn't fool a modern compiler anymore.
Signed-off-by: Ralf Baechle <ralf@linux-mips.org>
78 lines
1.8 KiB
C
78 lines
1.8 KiB
C
/* IEEE754 floating point arithmetic
|
|
* single precision
|
|
*/
|
|
/*
|
|
* MIPS floating point support
|
|
* Copyright (C) 1994-2000 Algorithmics Ltd.
|
|
* http://www.algor.co.uk
|
|
*
|
|
* ########################################################################
|
|
*
|
|
* 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.,
|
|
* 59 Temple Place - Suite 330, Boston MA 02111-1307, USA.
|
|
*
|
|
* ########################################################################
|
|
*/
|
|
|
|
|
|
#include "ieee754sp.h"
|
|
|
|
ieee754sp ieee754sp_fint(int x)
|
|
{
|
|
COMPXSP;
|
|
|
|
CLEARCX;
|
|
|
|
if (x == 0)
|
|
return ieee754sp_zero(0);
|
|
if (x == 1 || x == -1)
|
|
return ieee754sp_one(x < 0);
|
|
if (x == 10 || x == -10)
|
|
return ieee754sp_ten(x < 0);
|
|
|
|
xs = (x < 0);
|
|
if (xs) {
|
|
if (x == (1 << 31))
|
|
xm = ((unsigned) 1 << 31); /* max neg can't be safely negated */
|
|
else
|
|
xm = -x;
|
|
} else {
|
|
xm = x;
|
|
}
|
|
xe = SP_MBITS + 3;
|
|
|
|
if (xm >> (SP_MBITS + 1 + 3)) {
|
|
/* shunt out overflow bits
|
|
*/
|
|
while (xm >> (SP_MBITS + 1 + 3)) {
|
|
SPXSRSX1();
|
|
}
|
|
} else {
|
|
/* normalize in grs extended single precision
|
|
*/
|
|
while ((xm >> (SP_MBITS + 3)) == 0) {
|
|
xm <<= 1;
|
|
xe--;
|
|
}
|
|
}
|
|
SPNORMRET1(xs, xe, xm, "fint", x);
|
|
}
|
|
|
|
|
|
ieee754sp ieee754sp_funs(unsigned int u)
|
|
{
|
|
if ((int) u < 0)
|
|
return ieee754sp_add(ieee754sp_1e31(),
|
|
ieee754sp_fint(u & ~(1 << 31)));
|
|
return ieee754sp_fint(u);
|
|
}
|