tjh.dev
Linux kernel mirror (for testing)
git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git
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linux
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 * ########################################################################
10 *
11 * This program is free software; you can distribute it and/or modify it
12 * under the terms of the GNU General Public License (Version 2) as
13 * published by the Free Software Foundation.
14 *
15 * This program is distributed in the hope it will be useful, but WITHOUT
16 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
17 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
18 * for more details.
19 *
20 * You should have received a copy of the GNU General Public License along
21 * with this program; if not, write to the Free Software Foundation, Inc.,
22 * 59 Temple Place - Suite 330, Boston MA 02111-1307, USA.
23 *
24 * ########################################################################
25 */
26
27
28#include "ieee754int.h"
29
30#define assert(expr) ((void)0)
31
32/* 3bit extended single precision sticky right shift */
33#define SPXSRSXn(rs) \
34 (xe += rs, \
35 xm = (rs > (SP_MBITS+3))?1:((xm) >> (rs)) | ((xm) << (32-(rs)) != 0))
36
37#define SPXSRSX1() \
38 (xe++, (xm = (xm >> 1) | (xm & 1)))
39
40#define SPXSRSYn(rs) \
41 (ye+=rs, \
42 ym = (rs > (SP_MBITS+3))?1:((ym) >> (rs)) | ((ym) << (32-(rs)) != 0))
43
44#define SPXSRSY1() \
45 (ye++, (ym = (ym >> 1) | (ym & 1)))
46
47/* convert denormal to normalized with extended exponent */
48#define SPDNORMx(m,e) \
49 while( (m >> SP_MBITS) == 0) { m <<= 1; e--; }
50#define SPDNORMX SPDNORMx(xm, xe)
51#define SPDNORMY SPDNORMx(ym, ye)
52
53static inline ieee754sp buildsp(int s, int bx, unsigned m)
54{
55 ieee754sp r;
56
57 assert((s) == 0 || (s) == 1);
58 assert((bx) >= SP_EMIN - 1 + SP_EBIAS
59 && (bx) <= SP_EMAX + 1 + SP_EBIAS);
60 assert(((m) >> SP_MBITS) == 0);
61
62 r.parts.sign = s;
63 r.parts.bexp = bx;
64 r.parts.mant = m;
65
66 return r;
67}
68
69extern int ieee754sp_isnan(ieee754sp);
70extern int ieee754sp_issnan(ieee754sp);
71extern int ieee754si_xcpt(int, const char *, ...);
72extern s64 ieee754di_xcpt(s64, const char *, ...);
73extern ieee754sp ieee754sp_xcpt(ieee754sp, const char *, ...);
74extern ieee754sp ieee754sp_nanxcpt(ieee754sp, const char *, ...);
75extern ieee754sp ieee754sp_bestnan(ieee754sp, ieee754sp);
76extern ieee754sp ieee754sp_format(int, int, unsigned);
77
78
79#define SPNORMRET2(s, e, m, name, a0, a1) \
80{ \
81 ieee754sp V = ieee754sp_format(s, e, m); \
82 if(TSTX()) \
83 return ieee754sp_xcpt(V, name, a0, a1); \
84 else \
85 return V; \
86}
87
88#define SPNORMRET1(s, e, m, name, a0) SPNORMRET2(s, e, m, name, a0, a0)