1 /* IEEE754 floating point arithmetic
2 * double precision: common utilities
3 */
4 /*
5 * MIPS floating point support
6 * Copyright (C) 1994-2000 Algorithmics Ltd.
7 *
8 * ########################################################################
9 *
10 * This program is free software; you can distribute it and/or modify it
11 * under the terms of the GNU General Public License (Version 2) as
12 * published by the Free Software Foundation.
13 *
14 * This program is distributed in the hope it will be useful, but WITHOUT
15 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
16 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
17 * for more details.
18 *
19 * You should have received a copy of the GNU General Public License along
20 * with this program; if not, write to the Free Software Foundation, Inc.,
21 * 59 Temple Place - Suite 330, Boston MA 02111-1307, USA.
22 *
23 * ########################################################################
24 */
25
26
27 #include "ieee754dp.h"
28
ieee754dp_fsp(ieee754sp x)29 ieee754dp ieee754dp_fsp(ieee754sp x)
30 {
31 COMPXSP;
32
33 EXPLODEXSP;
34
35 CLEARCX;
36
37 FLUSHXSP;
38
39 switch (xc) {
40 case IEEE754_CLASS_SNAN:
41 SETCX(IEEE754_INVALID_OPERATION);
42 return ieee754dp_nanxcpt(ieee754dp_indef(), "fsp");
43 case IEEE754_CLASS_QNAN:
44 return ieee754dp_nanxcpt(builddp(xs,
45 DP_EMAX + 1 + DP_EBIAS,
46 ((u64) xm
47 << (DP_MBITS -
48 SP_MBITS))), "fsp",
49 x);
50 case IEEE754_CLASS_INF:
51 return ieee754dp_inf(xs);
52 case IEEE754_CLASS_ZERO:
53 return ieee754dp_zero(xs);
54 case IEEE754_CLASS_DNORM:
55 /* normalize */
56 while ((xm >> SP_MBITS) == 0) {
57 xm <<= 1;
58 xe--;
59 }
60 break;
61 case IEEE754_CLASS_NORM:
62 break;
63 }
64
65 /* CAN'T possibly overflow,underflow, or need rounding
66 */
67
68 /* drop the hidden bit */
69 xm &= ~SP_HIDDEN_BIT;
70
71 return builddp(xs, xe + DP_EBIAS,
72 (u64) xm << (DP_MBITS - SP_MBITS));
73 }
74