67 lines
1.5 KiB
C
67 lines
1.5 KiB
C
|
/* IEEE754 floating point arithmetic
|
||
|
|
* single precision
|
||
|
|
*/
|
||
|
|
/*
|
||
|
|
* 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"
|
||
|
|
|
||
|
|
union ieee754sp ieee754sp_neg(union ieee754sp x)
|
||
|
|
{
|
||
|
|
COMPXSP;
|
||
|
|
|
||
|
|
EXPLODEXSP;
|
||
|
|
ieee754_clearcx();
|
||
|
|
FLUSHXSP;
|
||
|
|
|
||
|
|
/*
|
||
|
|
* Invert the sign ALWAYS to prevent an endless recursion on
|
||
|
|
* pow() in libc.
|
||
|
|
*/
|
||
|
|
/* quick fix up */
|
||
|
|
SPSIGN(x) ^= 1;
|
||
|
|
|
||
|
|
if (xc == IEEE754_CLASS_SNAN) {
|
||
|
|
union ieee754sp y = ieee754sp_indef();
|
||
|
|
ieee754_setcx(IEEE754_INVALID_OPERATION);
|
||
|
|
SPSIGN(y) = SPSIGN(x);
|
||
|
|
return ieee754sp_nanxcpt(y);
|
||
|
|
}
|
||
|
|
|
||
|
|
return x;
|
||
|
|
}
|
||
|
|
|
||
|
|
union ieee754sp ieee754sp_abs(union ieee754sp x)
|
||
|
|
{
|
||
|
|
COMPXSP;
|
||
|
|
|
||
|
|
EXPLODEXSP;
|
||
|
|
ieee754_clearcx();
|
||
|
|
FLUSHXSP;
|
||
|
|
|
||
|
|
/* Clear sign ALWAYS, irrespective of NaN */
|
||
|
|
SPSIGN(x) = 0;
|
||
|
|
|
||
|
|
if (xc == IEEE754_CLASS_SNAN) {
|
||
|
|
ieee754_setcx(IEEE754_INVALID_OPERATION);
|
||
|
|
return ieee754sp_nanxcpt(ieee754sp_indef());
|
||
|
|
}
|
||
|
|
|
||
|
|
return x;
|
||
|
|
}
|