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
43static 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/* convert denormal to normalized with extended exponent */
59#define DPDNORMx(m,e) \
60	while ((m >> DP_FBITS) == 0) { m <<= 1; e--; }
61#define DPDNORMX	DPDNORMx(xm, xe)
62#define DPDNORMY	DPDNORMx(ym, ye)
63
64static inline union ieee754dp builddp(int s, int bx, u64 m)
65{
66	union ieee754dp r;
67
68	assert((s) == 0 || (s) == 1);
69	assert((bx) >= DP_EMIN - 1 + DP_EBIAS
70	       && (bx) <= DP_EMAX + 1 + DP_EBIAS);
71	assert(((m) >> DP_FBITS) == 0);
72
73	r.sign = s;
74	r.bexp = bx;
75	r.mant = m;
76
77	return r;
78}
79
80extern union ieee754dp __cold ieee754dp_nanxcpt(union ieee754dp);
81extern union ieee754dp ieee754dp_format(int, int, u64);
82