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 * 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 single precision sticky right shift */
34 #define SPXSRSXn(rs) \
35 (xe += rs, \
36 xm = (rs > (SP_MBITS+3))?1:((xm) >> (rs)) | ((xm) << (32-(rs)) != 0))
37
38 #define SPXSRSX1() \
39 (xe++, (xm = (xm >> 1) | (xm & 1)))
40
41 #define SPXSRSYn(rs) \
42 (ye+=rs, \
43 ym = (rs > (SP_MBITS+3))?1:((ym) >> (rs)) | ((ym) << (32-(rs)) != 0))
44
45 #define SPXSRSY1() \
46 (ye++, (ym = (ym >> 1) | (ym & 1)))
47
48 /* convert denormal to normalized with extended exponent */
49 #define SPDNORMx(m,e) \
50 while( (m >> SP_MBITS) == 0) { m <<= 1; e--; }
51 #define SPDNORMX SPDNORMx(xm, xe)
52 #define SPDNORMY SPDNORMx(ym, ye)
53
buildsp(int s,int bx,unsigned m)54 static inline ieee754sp buildsp(int s, int bx, unsigned m)
55 {
56 ieee754sp r;
57
58 assert((s) == 0 || (s) == 1);
59 assert((bx) >= SP_EMIN - 1 + SP_EBIAS
60 && (bx) <= SP_EMAX + 1 + SP_EBIAS);
61 assert(((m) >> SP_MBITS) == 0);
62
63 r.parts.sign = s;
64 r.parts.bexp = bx;
65 r.parts.mant = m;
66
67 return r;
68 }
69
70 extern int ieee754sp_isnan(ieee754sp);
71 extern int ieee754sp_issnan(ieee754sp);
72 extern int ieee754si_xcpt(int, const char *, ...);
73 extern s64 ieee754di_xcpt(s64, const char *, ...);
74 extern ieee754sp ieee754sp_xcpt(ieee754sp, const char *, ...);
75 extern ieee754sp ieee754sp_nanxcpt(ieee754sp, const char *, ...);
76 extern ieee754sp ieee754sp_bestnan(ieee754sp, ieee754sp);
77 extern ieee754sp ieee754sp_format(int, int, unsigned);
78
79
80 #define SPNORMRET2(s, e, m, name, a0, a1) \
81 { \
82 ieee754sp V = ieee754sp_format(s, e, m); \
83 if(TSTX()) \
84 return ieee754sp_xcpt(V, name, a0, a1); \
85 else \
86 return V; \
87 }
88
89 #define SPNORMRET1(s, e, m, name, a0) SPNORMRET2(s, e, m, name, a0, a0)
90