| /* 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" |
| |
| union ieee754dp ieee754dp_fint(int x) |
| { |
| u64 xm; |
| int xe; |
| int xs; |
| |
| ieee754_clearcx(); |
| |
| if (x == 0) |
| return ieee754dp_zero(0); |
| if (x == 1 || x == -1) |
| return ieee754dp_one(x < 0); |
| if (x == 10 || x == -10) |
| return ieee754dp_ten(x < 0); |
| |
| xs = (x < 0); |
| if (xs) { |
| if (x == (1 << 31)) |
| xm = ((unsigned) 1 << 31); /* max neg can't be safely negated */ |
| else |
| xm = -x; |
| } else { |
| xm = x; |
| } |
| |
| /* normalize - result can never be inexact or overflow */ |
| xe = DP_MBITS; |
| while ((xm >> DP_MBITS) == 0) { |
| xm <<= 1; |
| xe--; |
| } |
| return builddp(xs, xe + DP_EBIAS, xm & ~DP_HIDDEN_BIT); |
| } |
| |
| union ieee754dp ieee754dp_funs(unsigned int u) |
| { |
| if ((int) u < 0) |
| return ieee754dp_add(ieee754dp_1e31(), |
| ieee754dp_fint(u & ~(1 << 31))); |
| return ieee754dp_fint(u); |
| } |