xref: /linux/arch/mips/math-emu/sp_fint.c (revision 94bc2be31a01a3055ec94176e595dfe208e92d3b)
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 
30 ieee754sp ieee754sp_fint(int x)
31 {
32 	COMPXSP;
33 
34 	CLEARCX;
35 
36 	if (x == 0)
37 		return ieee754sp_zero(0);
38 	if (x == 1 || x == -1)
39 		return ieee754sp_one(x < 0);
40 	if (x == 10 || x == -10)
41 		return ieee754sp_ten(x < 0);
42 
43 	xs = (x < 0);
44 	if (xs) {
45 		if (x == (1 << 31))
46 			xm = ((unsigned) 1 << 31);	/* max neg can't be safely negated */
47 		else
48 			xm = -x;
49 	} else {
50 		xm = x;
51 	}
52 	xe = SP_MBITS + 3;
53 
54 	if (xm >> (SP_MBITS + 1 + 3)) {
55 		/* shunt out overflow bits
56 		 */
57 		while (xm >> (SP_MBITS + 1 + 3)) {
58 			SPXSRSX1();
59 		}
60 	} else {
61 		/* normalize in grs extended single precision
62 		 */
63 		while ((xm >> (SP_MBITS + 3)) == 0) {
64 			xm <<= 1;
65 			xe--;
66 		}
67 	}
68 	SPNORMRET1(xs, xe, xm, "fint", x);
69 }
70 
71 
72 ieee754sp ieee754sp_funs(unsigned int u)
73 {
74 	if ((int) u < 0)
75 		return ieee754sp_add(ieee754sp_1e31(),
76 				     ieee754sp_fint(u & ~(1 << 31)));
77 	return ieee754sp_fint(u);
78 }
79