| /* IEEE754 floating point arithmetic |
| * double precision: common utilities |
| */ |
| /* |
| * 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 "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); |
| } |