1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
|
/* ieee754 floating point arithmetic
* single and double precision
*
* BUGS
* not much dp done
* doesn't generate IEEE754_INEXACT
*
*/
/*
* MIPS floating point support
* Copyright (C) 1994-2000 Algorithmics Ltd.
* http://www.algor.co.uk
*
* ########################################################################
*
* This program is free software; you can distribute it and/or modify it
* under the terms of the GNU General Public License (Version 2) as
* published by the Free Software Foundation.
*
* This program is distributed in the hope it will be useful, but WITHOUT
* ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
* FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
* for more details.
*
* You should have received a copy of the GNU General Public License along
* with this program; if not, write to the Free Software Foundation, Inc.,
* 59 Temple Place - Suite 330, Boston MA 02111-1307, USA.
*
* ########################################################################
*/
#include "ieee754int.h"
#define DP_EBIAS 1023
#define DP_EMIN (-1022)
#define DP_EMAX 1023
#define SP_EBIAS 127
#define SP_EMIN (-126)
#define SP_EMAX 127
/* indexed by class */
const char *const ieee754_cname[] = {
"Normal",
"Zero",
"Denormal",
"Infinity",
"QNaN",
"SNaN",
};
/* the control status register
*/
struct ieee754_csr ieee754_csr;
/* special constants
*/
#if (defined(BYTE_ORDER) && BYTE_ORDER == LITTLE_ENDIAN) || defined(__MIPSEL__)
#define SPSTR(s,b,m) {m,b,s}
#define DPSTR(s,b,mh,ml) {ml,mh,b,s}
#endif
#ifdef __MIPSEB__
#define SPSTR(s,b,m) {s,b,m}
#define DPSTR(s,b,mh,ml) {s,b,mh,ml}
#endif
const struct ieee754dp_konst __ieee754dp_spcvals[] = {
DPSTR(0, DP_EMIN - 1 + DP_EBIAS, 0, 0), /* + zero */
DPSTR(1, DP_EMIN - 1 + DP_EBIAS, 0, 0), /* - zero */
DPSTR(0, DP_EBIAS, 0, 0), /* + 1.0 */
DPSTR(1, DP_EBIAS, 0, 0), /* - 1.0 */
DPSTR(0, 3 + DP_EBIAS, 0x40000, 0), /* + 10.0 */
DPSTR(1, 3 + DP_EBIAS, 0x40000, 0), /* - 10.0 */
DPSTR(0, DP_EMAX + 1 + DP_EBIAS, 0, 0), /* + infinity */
DPSTR(1, DP_EMAX + 1 + DP_EBIAS, 0, 0), /* - infinity */
DPSTR(0,DP_EMAX+1+DP_EBIAS,0x7FFFF,0xFFFFFFFF), /* + indef quiet Nan */
DPSTR(0, DP_EMAX + DP_EBIAS, 0xFFFFF, 0xFFFFFFFF), /* + max */
DPSTR(1, DP_EMAX + DP_EBIAS, 0xFFFFF, 0xFFFFFFFF), /* - max */
DPSTR(0, DP_EMIN + DP_EBIAS, 0, 0), /* + min normal */
DPSTR(1, DP_EMIN + DP_EBIAS, 0, 0), /* - min normal */
DPSTR(0, DP_EMIN - 1 + DP_EBIAS, 0, 1), /* + min denormal */
DPSTR(1, DP_EMIN - 1 + DP_EBIAS, 0, 1), /* - min denormal */
DPSTR(0, 31 + DP_EBIAS, 0, 0), /* + 1.0e31 */
DPSTR(0, 63 + DP_EBIAS, 0, 0), /* + 1.0e63 */
};
const struct ieee754sp_konst __ieee754sp_spcvals[] = {
SPSTR(0, SP_EMIN - 1 + SP_EBIAS, 0), /* + zero */
SPSTR(1, SP_EMIN - 1 + SP_EBIAS, 0), /* - zero */
SPSTR(0, SP_EBIAS, 0), /* + 1.0 */
SPSTR(1, SP_EBIAS, 0), /* - 1.0 */
SPSTR(0, 3 + SP_EBIAS, 0x200000), /* + 10.0 */
SPSTR(1, 3 + SP_EBIAS, 0x200000), /* - 10.0 */
SPSTR(0, SP_EMAX + 1 + SP_EBIAS, 0), /* + infinity */
SPSTR(1, SP_EMAX + 1 + SP_EBIAS, 0), /* - infinity */
SPSTR(0,SP_EMAX+1+SP_EBIAS,0x3FFFFF), /* + indef quiet Nan */
SPSTR(0, SP_EMAX + SP_EBIAS, 0x7FFFFF), /* + max normal */
SPSTR(1, SP_EMAX + SP_EBIAS, 0x7FFFFF), /* - max normal */
SPSTR(0, SP_EMIN + SP_EBIAS, 0), /* + min normal */
SPSTR(1, SP_EMIN + SP_EBIAS, 0), /* - min normal */
SPSTR(0, SP_EMIN - 1 + SP_EBIAS, 1), /* + min denormal */
SPSTR(1, SP_EMIN - 1 + SP_EBIAS, 1), /* - min denormal */
SPSTR(0, 31 + SP_EBIAS, 0), /* + 1.0e31 */
SPSTR(0, 63 + SP_EBIAS, 0), /* + 1.0e63 */
};
int ieee754si_xcpt(int r, const char *op, ...)
{
struct ieee754xctx ax;
if (!TSTX())
return r;
ax.op = op;
ax.rt = IEEE754_RT_SI;
ax.rv.si = r;
va_start(ax.ap, op);
ieee754_xcpt(&ax);
return ax.rv.si;
}
s64 ieee754di_xcpt(s64 r, const char *op, ...)
{
struct ieee754xctx ax;
if (!TSTX())
return r;
ax.op = op;
ax.rt = IEEE754_RT_DI;
ax.rv.di = r;
va_start(ax.ap, op);
ieee754_xcpt(&ax);
return ax.rv.di;
}
|
