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
builddp(int s,int bx,u64 m)49 static __inline ieee754dp builddp(int s, int bx, u64 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 s64 ieee754di_xcpt(s64, 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, u64);
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