1/* IEEE754 floating point arithmetic
2 * single precision
3 */
4/*
5 * MIPS floating point support
6 * Copyright (C) 1994-2000 Algorithmics Ltd.
7 * http://www.algor.co.uk
8 *
9 * ########################################################################
10 *
11 *  This program is free software; you can distribute it and/or modify it
12 *  under the terms of the GNU General Public License (Version 2) as
13 *  published by the Free Software Foundation.
14 *
15 *  This program is distributed in the hope it will be useful, but WITHOUT
16 *  ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
17 *  FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
18 *  for more details.
19 *
20 *  You should have received a copy of the GNU General Public License along
21 *  with this program; if not, write to the Free Software Foundation, Inc.,
22 *  59 Temple Place - Suite 330, Boston MA 02111-1307, USA.
23 *
24 * ########################################################################
25 */
26
27
28#include "ieee754sp.h"
29
30ieee754sp ieee754sp_flong(s64 x)
31{
32	u64 xm;		/* <--- need 64-bit mantissa temp */
33	int xe;
34	int xs;
35
36	CLEARCX;
37
38	if (x == 0)
39		return ieee754sp_zero(0);
40	if (x == 1 || x == -1)
41		return ieee754sp_one(x < 0);
42	if (x == 10 || x == -10)
43		return ieee754sp_ten(x < 0);
44
45	xs = (x < 0);
46	if (xs) {
47		if (x == (1ULL << 63))
48			xm = (1ULL << 63);	/* max neg can't be safely negated */
49		else
50			xm = -x;
51	} else {
52		xm = x;
53	}
54	xe = SP_MBITS + 3;
55
56	if (xm >> (SP_MBITS + 1 + 3)) {
57		/* shunt out overflow bits
58		 */
59		while (xm >> (SP_MBITS + 1 + 3)) {
60			SPXSRSX1();
61		}
62	} else {
63		/* normalize in grs extended single precision */
64		while ((xm >> (SP_MBITS + 3)) == 0) {
65			xm <<= 1;
66			xe--;
67		}
68	}
69	SPNORMRET1(xs, xe, xm, "sp_flong", x);
70}
71
72
73ieee754sp ieee754sp_fulong(u64 u)
74{
75	if ((s64) u < 0)
76		return ieee754sp_add(ieee754sp_1e63(),
77				     ieee754sp_flong(u & ~(1ULL << 63)));
78	return ieee754sp_flong(u);
79}
80