File: /usr/src/linux/arch/mips/math-emu/sp_tlong.c

1     /* IEEE754 floating point arithmetic
2      * single precision
3      */
4     /*
5      * MIPS floating point support
6      * Copyright (C) 1994-2000 Algorithmics Ltd.  All rights reserved.
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     long long ieee754sp_tlong(ieee754sp x)
31     {
32     	COMPXDP;		/* <-- need 64-bit mantissa tmp */
33     
34     	CLEARCX;
35     
36     	EXPLODEXSP;
37     
38     	switch (xc) {
39     	case IEEE754_CLASS_SNAN:
40     	case IEEE754_CLASS_QNAN:
41     		SETCX(IEEE754_INVALID_OPERATION);
42     		return ieee754di_xcpt(ieee754di_indef(), "sp_tlong", x);
43     	case IEEE754_CLASS_INF:
44     		SETCX(IEEE754_OVERFLOW);
45     		return ieee754di_xcpt(ieee754di_indef(), "sp_tlong", x);
46     	case IEEE754_CLASS_ZERO:
47     		return 0;
48     	case IEEE754_CLASS_DNORM:	/* much to small */
49     		SETCX(IEEE754_UNDERFLOW);
50     		return ieee754di_xcpt(0, "sp_tlong", x);
51     	case IEEE754_CLASS_NORM:
52     		break;
53     	}
54     	if (xe >= 63) {
55     		SETCX(IEEE754_OVERFLOW);
56     		return ieee754di_xcpt(ieee754di_indef(), "sp_tlong", x);
57     	}
58     	if (xe < 0) {
59     		SETCX(IEEE754_UNDERFLOW);
60     		return ieee754di_xcpt(0, "sp_tlong", x);
61     	}
62     	/* oh gawd */
63     	if (xe > SP_MBITS) {
64     		xm <<= xe - SP_MBITS;
65     	} else if (xe < SP_MBITS) {
66     		/* XXX no rounding 
67     		 */
68     		xm >>= SP_MBITS - xe;
69     	}
70     	if (xs)
71     		return -xm;
72     	else
73     		return xm;
74     }
75     
76     
77     unsigned long long ieee754sp_tulong(ieee754sp x)
78     {
79     	ieee754sp hb = ieee754sp_1e63();
80     
81     	/* what if x < 0 ?? */
82     	if (ieee754sp_lt(x, hb))
83     		return (unsigned long long) ieee754sp_tlong(x);
84     
85     	return (unsigned long long) ieee754sp_tlong(ieee754sp_sub(x, hb)) |
86     	    (1ULL << 63);
87     }
88