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_fint(int 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 == (1 << 31))
47			xm = ((unsigned) 1 << 31);	/* max neg can't be safely negated */
48		else
49			xm = -x;
50	} else {
51		xm = x;
52	}
53
54#if 1
55	/* normalize - result can never be inexact or overflow */
56	xe = DP_MBITS;
57	while ((xm >> DP_MBITS) == 0) {
58		xm <<= 1;
59		xe--;
60	}
61	return builddp(xs, xe + DP_EBIAS, xm & ~DP_HIDDEN_BIT);
62#else
63	/* normalize */
64	xe = DP_MBITS + 3;
65	while ((xm >> (DP_MBITS + 3)) == 0) {
66		xm <<= 1;
67		xe--;
68	}
69	DPNORMRET1(xs, xe, xm, "fint", x);
70#endif
71}
72
73ieee754dp ieee754dp_funs(unsigned int u)
74{
75	if ((int) u < 0)
76		return ieee754dp_add(ieee754dp_1e31(),
77				     ieee754dp_fint(u & ~(1 << 31)));
78	return ieee754dp_fint(u);
79}

 1// SPDX-License-Identifier: GPL-2.0-only
 2/* IEEE754 floating point arithmetic
 3 * double precision: common utilities
 4 */
 5/*
 6 * MIPS floating point support
 7 * Copyright (C) 1994-2000 Algorithmics Ltd.
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 8 */
 9
 
10#include "ieee754dp.h"
11
12union ieee754dp ieee754dp_fint(int x)
13{
14	u64 xm;
15	int xe;
16	int xs;
17
18	ieee754_clearcx();
19
20	if (x == 0)
21		return ieee754dp_zero(0);
22	if (x == 1 || x == -1)
23		return ieee754dp_one(x < 0);
24	if (x == 10 || x == -10)
25		return ieee754dp_ten(x < 0);
26
27	xs = (x < 0);
28	if (xs) {
29		if (x == (1 << 31))
30			xm = ((unsigned) 1 << 31);	/* max neg can't be safely negated */
31		else
32			xm = -x;
33	} else {
34		xm = x;
35	}
36
 
37	/* normalize - result can never be inexact or overflow */
38	xe = DP_FBITS;
39	while ((xm >> DP_FBITS) == 0) {
40		xm <<= 1;
41		xe--;
42	}
43	return builddp(xs, xe + DP_EBIAS, xm & ~DP_HIDDEN_BIT);
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
44}