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1da177e4 LT |
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. | |
1da177e4 | 8 | * |
1da177e4 LT |
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., | |
3f7cac41 | 20 | * 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA. |
1da177e4 LT |
21 | */ |
22 | ||
cae55066 | 23 | #include <linux/compiler.h> |
1da177e4 LT |
24 | |
25 | #include "ieee754int.h" | |
26 | ||
27 | #define assert(expr) ((void)0) | |
28 | ||
b3a7ad2b RB |
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 | ||
49548b09 RB |
39 | #define DPSIGN(dp) (dp.sign) |
40 | #define DPBEXP(dp) (dp.bexp) | |
41 | #define DPMANT(dp) (dp.mant) | |
b3a7ad2b | 42 | |
3a33db23 RB |
43 | static inline int ieee754dp_finite(union ieee754dp x) |
44 | { | |
45 | return DPBEXP(x) != DP_EMAX + 1 + DP_EBIAS; | |
46 | } | |
47 | ||
1da177e4 LT |
48 | /* 3bit extended double precision sticky right shift */ |
49 | #define XDPSRS(v,rs) \ | |
ad8fb553 | 50 | ((rs > (DP_FBITS+3))?1:((v) >> (rs)) | ((v) << (64-(rs)) != 0)) |
1da177e4 LT |
51 | |
52 | #define XDPSRSX1() \ | |
47fa0c02 | 53 | (xe++, (xm = (xm >> 1) | (xm & 1))) |
1da177e4 LT |
54 | |
55 | #define XDPSRS1(v) \ | |
47fa0c02 | 56 | (((v) >> 1) | ((v) & 1)) |
1da177e4 LT |
57 | |
58 | /* convert denormal to normalized with extended exponent */ | |
59 | #define DPDNORMx(m,e) \ | |
ad8fb553 | 60 | while ((m >> DP_FBITS) == 0) { m <<= 1; e--; } |
21a151d8 RB |
61 | #define DPDNORMX DPDNORMx(xm, xe) |
62 | #define DPDNORMY DPDNORMx(ym, ye) | |
e2d11e1a | 63 | #define DPDNORMZ DPDNORMx(zm, ze) |
1da177e4 | 64 | |
2209bcb1 | 65 | static inline union ieee754dp builddp(int s, int bx, u64 m) |
1da177e4 | 66 | { |
2209bcb1 | 67 | union ieee754dp r; |
1da177e4 LT |
68 | |
69 | assert((s) == 0 || (s) == 1); | |
70 | assert((bx) >= DP_EMIN - 1 + DP_EBIAS | |
71 | && (bx) <= DP_EMAX + 1 + DP_EBIAS); | |
ad8fb553 | 72 | assert(((m) >> DP_FBITS) == 0); |
1da177e4 | 73 | |
49548b09 RB |
74 | r.sign = s; |
75 | r.bexp = bx; | |
76 | r.mant = m; | |
77 | ||
1da177e4 LT |
78 | return r; |
79 | } | |
80 | ||
90efba36 | 81 | extern union ieee754dp __cold ieee754dp_nanxcpt(union ieee754dp); |
2209bcb1 | 82 | extern union ieee754dp ieee754dp_format(int, int, u64); |