File: /usr/src/linux/arch/mips/math-emu/ieee754dp.h

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.  All rights reserved.
8      * http://www.algor.co.uk
9      *
10      * ########################################################################
11      *
12      *  This program is free software; you can distribute it and/or modify it
13      *  under the terms of the GNU General Public License (Version 2) as
14      *  published by the Free Software Foundation.
15      *
16      *  This program is distributed in the hope it will be useful, but WITHOUT
17      *  ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
18      *  FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
19      *  for more details.
20      *
21      *  You should have received a copy of the GNU General Public License along
22      *  with this program; if not, write to the Free Software Foundation, Inc.,
23      *  59 Temple Place - Suite 330, Boston MA 02111-1307, USA.
24      *
25      * ########################################################################
26      */
27     
28     
29     #include "ieee754int.h"
30     
31     #define assert(expr) ((void)0)
32     
33     /* 3bit extended double precision sticky right shift */
34     #define XDPSRS(v,rs)	\
35       ((rs > (DP_MBITS+3))?1:((v) >> (rs)) | ((v) << (64-(rs)) != 0))
36     
37     #define XDPSRSX1() \
38       (xe++, (xm = (xm >> 1) | (xm & 1)))
39     
40     #define XDPSRS1(v)	\
41       (((v) >> 1) | ((v) & 1))
42     
43     /* convert denormal to normalized with extended exponent */
44     #define DPDNORMx(m,e) \
45       while( (m >> DP_MBITS) == 0) { m <<= 1; e--; }
46     #define DPDNORMX	DPDNORMx(xm,xe)
47     #define DPDNORMY	DPDNORMx(ym,ye)
48     
49     static __inline ieee754dp builddp(int s, int bx, unsigned long long m)
50     {
51     	ieee754dp r;
52     
53     	assert((s) == 0 || (s) == 1);
54     	assert((bx) >= DP_EMIN - 1 + DP_EBIAS
55     	       && (bx) <= DP_EMAX + 1 + DP_EBIAS);
56     	assert(((m) >> DP_MBITS) == 0);
57     
58     	r.parts.sign = s;
59     	r.parts.bexp = bx;
60     	r.parts.mant = m;
61     	return r;
62     }
63     
64     extern int ieee754dp_isnan(ieee754dp);
65     extern int ieee754dp_issnan(ieee754dp);
66     extern int ieee754si_xcpt(int, const char *, ...);
67     extern long long ieee754di_xcpt(long long, const char *, ...);
68     extern ieee754dp ieee754dp_xcpt(ieee754dp, const char *, ...);
69     extern ieee754dp ieee754dp_nanxcpt(ieee754dp, const char *, ...);
70     extern ieee754dp ieee754dp_bestnan(ieee754dp, ieee754dp);
71     extern ieee754dp ieee754dp_format(int, int, unsigned long long);
72     
73     
74     #define DPNORMRET2(s,e,m,name,a0,a1) \
75     { \
76         ieee754dp V = ieee754dp_format(s,e,m); \
77         if(TSTX()) \
78           return ieee754dp_xcpt(V,name,a0,a1); \
79         else \
80           return V; \
81     }
82     
83     #define DPNORMRET1(s,e,m,name,a0)  DPNORMRET2(s,e,m,name,a0,a0)
84