]>
Commit | Line | Data |
---|---|---|
9d5a6349 | 1 | /* SPDX-License-Identifier: GPL-2.0-only */ |
1da177e4 LT |
2 | /* |
3 | * IEEE754 floating point | |
4 | * double precision internal header file | |
5 | */ | |
6 | /* | |
7 | * MIPS floating point support | |
8 | * Copyright (C) 1994-2000 Algorithmics Ltd. | |
1da177e4 LT |
9 | */ |
10 | ||
cae55066 | 11 | #include <linux/compiler.h> |
1da177e4 LT |
12 | |
13 | #include "ieee754int.h" | |
14 | ||
15 | #define assert(expr) ((void)0) | |
16 | ||
b3a7ad2b RB |
17 | #define SP_EBIAS 127 |
18 | #define SP_EMIN (-126) | |
19 | #define SP_EMAX 127 | |
20 | #define SP_FBITS 23 | |
21 | #define SP_MBITS 23 | |
22 | ||
23 | #define SP_MBIT(x) ((u32)1 << (x)) | |
24 | #define SP_HIDDEN_BIT SP_MBIT(SP_FBITS) | |
25 | #define SP_SIGN_BIT SP_MBIT(31) | |
26 | ||
49548b09 RB |
27 | #define SPSIGN(sp) (sp.sign) |
28 | #define SPBEXP(sp) (sp.bexp) | |
29 | #define SPMANT(sp) (sp.mant) | |
b3a7ad2b | 30 | |
3a33db23 RB |
31 | static inline int ieee754sp_finite(union ieee754sp x) |
32 | { | |
33 | return SPBEXP(x) != SP_EMAX + 1 + SP_EBIAS; | |
34 | } | |
35 | ||
b3b8e1eb DL |
36 | /* 64 bit right shift with rounding */ |
37 | #define XSPSRS64(v, rs) \ | |
38 | (((rs) >= 64) ? ((v) != 0) : ((v) >> (rs)) | ((v) << (64-(rs)) != 0)) | |
39 | ||
1da177e4 | 40 | /* 3bit extended single precision sticky right shift */ |
db57f29d PB |
41 | #define XSPSRS(v, rs) \ |
42 | ((rs > (SP_FBITS+3))?1:((v) >> (rs)) | ((v) << (32-(rs)) != 0)) | |
1da177e4 | 43 | |
db57f29d PB |
44 | #define XSPSRS1(m) \ |
45 | ((m >> 1) | (m & 1)) | |
1da177e4 | 46 | |
db57f29d PB |
47 | #define SPXSRSX1() \ |
48 | (xe++, (xm = XSPSRS1(xm))) | |
1da177e4 LT |
49 | |
50 | #define SPXSRSY1() \ | |
db57f29d | 51 | (ye++, (ym = XSPSRS1(ym))) |
1da177e4 LT |
52 | |
53 | /* convert denormal to normalized with extended exponent */ | |
54 | #define SPDNORMx(m,e) \ | |
ad8fb553 | 55 | while ((m >> SP_FBITS) == 0) { m <<= 1; e--; } |
21a151d8 RB |
56 | #define SPDNORMX SPDNORMx(xm, xe) |
57 | #define SPDNORMY SPDNORMx(ym, ye) | |
e2d11e1a | 58 | #define SPDNORMZ SPDNORMx(zm, ze) |
1da177e4 | 59 | |
a58f85b5 | 60 | static inline union ieee754sp buildsp(int s, int bx, unsigned int m) |
1da177e4 | 61 | { |
2209bcb1 | 62 | union ieee754sp r; |
1da177e4 LT |
63 | |
64 | assert((s) == 0 || (s) == 1); | |
65 | assert((bx) >= SP_EMIN - 1 + SP_EBIAS | |
66 | && (bx) <= SP_EMAX + 1 + SP_EBIAS); | |
ad8fb553 | 67 | assert(((m) >> SP_FBITS) == 0); |
1da177e4 | 68 | |
49548b09 RB |
69 | r.sign = s; |
70 | r.bexp = bx; | |
71 | r.mant = m; | |
1da177e4 LT |
72 | |
73 | return r; | |
74 | } | |
75 | ||
90efba36 | 76 | extern union ieee754sp __cold ieee754sp_nanxcpt(union ieee754sp); |
2209bcb1 | 77 | extern union ieee754sp ieee754sp_format(int, int, unsigned); |