dp_logb.c
1.39 KB
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/* 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);
}