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 *  This program is free software; you can distribute it and/or modify it
 9 *  under the terms of the GNU General Public License (Version 2) as
10 *  published by the Free Software Foundation.
11 *
12 *  This program is distributed in the hope it will be useful, but WITHOUT
13 *  ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
14 *  FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
15 *  for more details.
16 *
17 *  You should have received a copy of the GNU General Public License along
18 *  with this program; if not, write to the Free Software Foundation, Inc.,
19 *  51 Franklin St, Fifth Floor, Boston, MA  02110-1301  USA.
 
 
20 */
21
 
22#include "ieee754dp.h"
23
24union ieee754dp ieee754dp_flong(s64 x)
25{
26	u64 xm;
27	int xe;
28	int xs;
29
30	ieee754_clearcx();
31
32	if (x == 0)
33		return ieee754dp_zero(0);
34	if (x == 1 || x == -1)
35		return ieee754dp_one(x < 0);
36	if (x == 10 || x == -10)
37		return ieee754dp_ten(x < 0);
38
39	xs = (x < 0);
40	if (xs) {
41		if (x == (1ULL << 63))
42			xm = (1ULL << 63);	/* max neg can't be safely negated */
43		else
44			xm = -x;
45	} else {
46		xm = x;
47	}
48
49	/* normalize */
50	xe = DP_FBITS + 3;
51	if (xm >> (DP_FBITS + 1 + 3)) {
52		/* shunt out overflow bits */
53		while (xm >> (DP_FBITS + 1 + 3)) {
54			XDPSRSX1();
55		}
56	} else {
57		/* normalize in grs extended double precision */
58		while ((xm >> (DP_FBITS + 3)) == 0) {
59			xm <<= 1;
60			xe--;
61		}
62	}
 
 
63
64	return ieee754dp_format(xs, xe, xm);
 
 
 
 
 
65}

 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
29ieee754dp ieee754dp_flong(s64 x)
30{
31	u64 xm;
32	int xe;
33	int xs;
34
35	CLEARCX;
36
37	if (x == 0)
38		return ieee754dp_zero(0);
39	if (x == 1 || x == -1)
40		return ieee754dp_one(x < 0);
41	if (x == 10 || x == -10)
42		return ieee754dp_ten(x < 0);
43
44	xs = (x < 0);
45	if (xs) {
46		if (x == (1ULL << 63))
47			xm = (1ULL << 63);	/* max neg can't be safely negated */
48		else
49			xm = -x;
50	} else {
51		xm = x;
52	}
53
54	/* normalize */
55	xe = DP_MBITS + 3;
56	if (xm >> (DP_MBITS + 1 + 3)) {
57		/* shunt out overflow bits */
58		while (xm >> (DP_MBITS + 1 + 3)) {
59			XDPSRSX1();
60		}
61	} else {
62		/* normalize in grs extended double precision */
63		while ((xm >> (DP_MBITS + 3)) == 0) {
64			xm <<= 1;
65			xe--;
66		}
67	}
68	DPNORMRET1(xs, xe, xm, "dp_flong", x);
69}
70
71ieee754dp ieee754dp_fulong(u64 u)
72{
73	if ((s64) u < 0)
74		return ieee754dp_add(ieee754dp_1e63(),
75				     ieee754dp_flong(u & ~(1ULL << 63)));
76	return ieee754dp_flong(u);
77}