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 SP_EBIAS	127
30#define SP_EMIN		(-126)
31#define SP_EMAX		127
32#define SP_FBITS	23
33#define SP_MBITS	23
34
35#define SP_MBIT(x)	((u32)1 << (x))
36#define SP_HIDDEN_BIT	SP_MBIT(SP_FBITS)
37#define SP_SIGN_BIT	SP_MBIT(31)
38
39#define SPSIGN(sp)	(sp.sign)
40#define SPBEXP(sp)	(sp.bexp)
41#define SPMANT(sp)	(sp.mant)
42
43static inline int ieee754sp_finite(union ieee754sp x)
44{
45	return SPBEXP(x) != SP_EMAX + 1 + SP_EBIAS;
46}
47
48/* 3bit extended single precision sticky right shift */
49#define SPXSRSXn(rs)							\
50	(xe += rs,							\
51	 xm = (rs > (SP_FBITS+3))?1:((xm) >> (rs)) | ((xm) << (32-(rs)) != 0))
52
53#define SPXSRSX1() \
54	(xe++, (xm = (xm >> 1) | (xm & 1)))
55
56#define SPXSRSYn(rs)								\
57	(ye+=rs,								\
58	 ym = (rs > (SP_FBITS+3))?1:((ym) >> (rs)) | ((ym) << (32-(rs)) != 0))
59
60#define SPXSRSY1() \
61	(ye++, (ym = (ym >> 1) | (ym & 1)))
62
63/* convert denormal to normalized with extended exponent */
64#define SPDNORMx(m,e) \
65	while ((m >> SP_FBITS) == 0) { m <<= 1; e--; }
66#define SPDNORMX	SPDNORMx(xm, xe)
67#define SPDNORMY	SPDNORMx(ym, ye)
68
69static inline union ieee754sp buildsp(int s, int bx, unsigned m)
70{
71	union ieee754sp r;
72
73	assert((s) == 0 || (s) == 1);
74	assert((bx) >= SP_EMIN - 1 + SP_EBIAS
75	       && (bx) <= SP_EMAX + 1 + SP_EBIAS);
76	assert(((m) >> SP_FBITS) == 0);
77
78	r.sign = s;
79	r.bexp = bx;
80	r.mant = m;
81
82	return r;
83}
84
85extern union ieee754sp __cold ieee754sp_nanxcpt(union ieee754sp);
86extern union ieee754sp ieee754sp_format(int, int, unsigned);
87