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/* IEEE754 floating point arithmetic
* double precision: common utilities
*/
/*
* MIPS floating point support
* Copyright (C) 1994-2000 Algorithmics Ltd. All rights reserved.
* 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 <linux/kernel.h>
#include "ieee754dp.h"
int ieee754dp_tint(ieee754dp x)
{
COMPXDP;
CLEARCX;
EXPLODEXDP;
switch (xc) {
case IEEE754_CLASS_SNAN:
case IEEE754_CLASS_QNAN:
SETCX(IEEE754_INVALID_OPERATION);
return ieee754si_xcpt(ieee754si_indef(), "fixdp", x);
case IEEE754_CLASS_INF:
SETCX(IEEE754_OVERFLOW);
return ieee754si_xcpt(ieee754si_indef(), "fixdp", x);
case IEEE754_CLASS_ZERO:
return 0;
case IEEE754_CLASS_DNORM: /* much to small */
SETCX(IEEE754_UNDERFLOW);
return ieee754si_xcpt(0, "fixdp", x);
case IEEE754_CLASS_NORM:
break;
}
if (xe >= 31) {
SETCX(IEEE754_OVERFLOW);
return ieee754si_xcpt(ieee754si_indef(), "fix", x);
}
if (xe < 0) {
SETCX(IEEE754_UNDERFLOW);
return ieee754si_xcpt(0, "fix", x);
}
/* oh gawd */
if (xe > DP_MBITS) {
xm <<= xe - DP_MBITS;
} else if (xe < DP_MBITS) {
/* XXX no rounding
*/
xm >>= DP_MBITS - xe;
}
if (xs)
return -xm;
else
return xm;
}
unsigned int ieee754dp_tuns(ieee754dp x)
{
ieee754dp hb = ieee754dp_1e31();
/* what if x < 0 ?? */
if (ieee754dp_lt(x, hb))
return (unsigned) ieee754dp_tint(x);
return (unsigned) ieee754dp_tint(ieee754dp_sub(x, hb)) |
((unsigned) 1 << 31);
}
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