1 /*
2 * IEEE754 floating point
3 * double precision internal header file
4 */
5 /*
6 * MIPS floating point support
7 * Copyright (C) 1994-2000 Algorithmics Ltd.
8 *
9 * This program is free software; you can distribute it and/or modify it
10 * under the terms of the GNU General Public License (Version 2) as
11 * published by the Free Software Foundation.
12 *
13 * This program is distributed in the hope it will be useful, but WITHOUT
14 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
15 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
16 * for more details.
17 *
18 * You should have received a copy of the GNU General Public License along
19 * with this program; if not, write to the Free Software Foundation, Inc.,
20 * 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
21 */
22
23 #include <linux/compiler.h>
24
25 #include "ieee754int.h"
26
27 #define assert(expr) ((void)0)
28
29 #define DP_EBIAS 1023
30 #define DP_EMIN (-1022)
31 #define DP_EMAX 1023
32 #define DP_FBITS 52
33 #define DP_MBITS 52
34
35 #define DP_MBIT(x) ((u64)1 << (x))
36 #define DP_HIDDEN_BIT DP_MBIT(DP_FBITS)
37 #define DP_SIGN_BIT DP_MBIT(63)
38
39 #define DPSIGN(dp) (dp.sign)
40 #define DPBEXP(dp) (dp.bexp)
41 #define DPMANT(dp) (dp.mant)
42
ieee754dp_finite(union ieee754dp x)43 static inline int ieee754dp_finite(union ieee754dp x)
44 {
45 return DPBEXP(x) != DP_EMAX + 1 + DP_EBIAS;
46 }
47
48 /* 3bit extended double precision sticky right shift */
49 #define XDPSRS(v,rs) \
50 ((rs > (DP_FBITS+3))?1:((v) >> (rs)) | ((v) << (64-(rs)) != 0))
51
52 #define XDPSRSX1() \
53 (xe++, (xm = (xm >> 1) | (xm & 1)))
54
55 #define XDPSRS1(v) \
56 (((v) >> 1) | ((v) & 1))
57
58 /* 32bit * 32bit => 64bit unsigned integer multiplication */
59 #define DPXMULT(x, y) ((u64)(x) * (u64)y)
60
61 /* convert denormal to normalized with extended exponent */
62 #define DPDNORMx(m,e) \
63 while ((m >> DP_FBITS) == 0) { m <<= 1; e--; }
64 #define DPDNORMX DPDNORMx(xm, xe)
65 #define DPDNORMY DPDNORMx(ym, ye)
66 #define DPDNORMZ DPDNORMx(zm, ze)
67
builddp(int s,int bx,u64 m)68 static inline union ieee754dp builddp(int s, int bx, u64 m)
69 {
70 union ieee754dp r;
71
72 assert((s) == 0 || (s) == 1);
73 assert((bx) >= DP_EMIN - 1 + DP_EBIAS
74 && (bx) <= DP_EMAX + 1 + DP_EBIAS);
75 assert(((m) >> DP_FBITS) == 0);
76
77 r.sign = s;
78 r.bexp = bx;
79 r.mant = m;
80
81 return r;
82 }
83
84 extern union ieee754dp __cold ieee754dp_nanxcpt(union ieee754dp);
85 extern union ieee754dp ieee754dp_format(int, int, u64);
86