54 строки
1.4 KiB
C
54 строки
1.4 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.,
|
|
* 59 Temple Place - Suite 330, Boston MA 02111-1307, USA.
|
|
*
|
|
* ########################################################################
|
|
*/
|
|
|
|
|
|
#include "ieee754dp.h"
|
|
|
|
ieee754dp ieee754dp_logb(ieee754dp x)
|
|
{
|
|
COMPXDP;
|
|
|
|
CLEARCX;
|
|
|
|
EXPLODEXDP;
|
|
|
|
switch (xc) {
|
|
case IEEE754_CLASS_SNAN:
|
|
return ieee754dp_nanxcpt(x, "logb", x);
|
|
case IEEE754_CLASS_QNAN:
|
|
return x;
|
|
case IEEE754_CLASS_INF:
|
|
return ieee754dp_inf(0);
|
|
case IEEE754_CLASS_ZERO:
|
|
return ieee754dp_inf(1);
|
|
case IEEE754_CLASS_DNORM:
|
|
DPDNORMX;
|
|
break;
|
|
case IEEE754_CLASS_NORM:
|
|
break;
|
|
}
|
|
return ieee754dp_fint(xe);
|
|
}
|