blob: 4b5ee799b4a44499506c24855a3902edd3d55493 (
plain) (
blame)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
|
/* 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);
}
|
