1 /* SPDX-License-Identifier: GPL-2.0-only */
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.
9 */
10
11 #include <linux/compiler.h>
12
13 #include "ieee754int.h"
14
15 #define assert(expr) ((void)0)
16
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
27 #define SPSIGN(sp) (sp.sign)
28 #define SPBEXP(sp) (sp.bexp)
29 #define SPMANT(sp) (sp.mant)
30
31 static inline int ieee754sp_finite(union ieee754sp x)
32 {
33 return SPBEXP(x) != SP_EMAX + 1 + SP_EBIAS;
34 }
35
36 /* 64 bit right shift with rounding */
37 #define XSPSRS64(v, rs) \
38 (((rs) >= 64) ? ((v) != 0) : ((v) >> (rs)) | ((v) << (64-(rs)) != 0))
39
40 /* 3bit extended single precision sticky right shift */
41 #define XSPSRS(v, rs) \
42 ((rs > (SP_FBITS+3))?1:((v) >> (rs)) | ((v) << (32-(rs)) != 0))
43
44 #define XSPSRS1(m) \
45 ((m >> 1) | (m & 1))
46
47 #define SPXSRSX1() \
48 (xe++, (xm = XSPSRS1(xm)))
49
50 #define SPXSRSY1() \
51 (ye++, (ym = XSPSRS1(ym)))
52
53 /* convert denormal to normalized with extended exponent */
54 #define SPDNORMx(m,e) \
55 while ((m >> SP_FBITS) == 0) { m <<= 1; e--; }
56 #define SPDNORMX SPDNORMx(xm, xe)
57 #define SPDNORMY SPDNORMx(ym, ye)
58 #define SPDNORMZ SPDNORMx(zm, ze)
59
60 static inline union ieee754sp buildsp(int s, int bx, unsigned int m)
61 {
62 union ieee754sp r;
63
64 assert((s) == 0 || (s) == 1);
65 assert((bx) >= SP_EMIN - 1 + SP_EBIAS
66 && (bx) <= SP_EMAX + 1 + SP_EBIAS);
67 assert(((m) >> SP_FBITS) == 0);
68
69 r.sign = s;
70 r.bexp = bx;
71 r.mant = m;
72
73 return r;
74 }
75
76 extern union ieee754sp __cold ieee754sp_nanxcpt(union ieee754sp);
77 extern union ieee754sp ieee754sp_format(int, int, unsigned);
78
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