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 double precision sticky right shift */
33#define XDPSRS(v,rs) \
34 ((rs > (DP_MBITS+3))?1:((v) >> (rs)) | ((v) << (64-(rs)) != 0))
35
36#define XDPSRSX1() \
37 (xe++, (xm = (xm >> 1) | (xm & 1)))
38
39#define XDPSRS1(v) \
40 (((v) >> 1) | ((v) & 1))
41
42/* convert denormal to normalized with extended exponent */
43#define DPDNORMx(m,e) \
44 while( (m >> DP_MBITS) == 0) { m <<= 1; e--; }
45#define DPDNORMX DPDNORMx(xm, xe)
46#define DPDNORMY DPDNORMx(ym, ye)
47
48static inline ieee754dp builddp(int s, int bx, u64 m)
49{
50 ieee754dp r;
51
52 assert((s) == 0 || (s) == 1);
53 assert((bx) >= DP_EMIN - 1 + DP_EBIAS
54 && (bx) <= DP_EMAX + 1 + DP_EBIAS);
55 assert(((m) >> DP_MBITS) == 0);
56
57 r.parts.sign = s;
58 r.parts.bexp = bx;
59 r.parts.mant = m;
60 return r;
61}
62
63extern int ieee754dp_isnan(ieee754dp);
64extern int ieee754dp_issnan(ieee754dp);
65extern int ieee754si_xcpt(int, const char *, ...);
66extern s64 ieee754di_xcpt(s64, const char *, ...);
67extern ieee754dp ieee754dp_xcpt(ieee754dp, const char *, ...);
68extern ieee754dp ieee754dp_nanxcpt(ieee754dp, const char *, ...);
69extern ieee754dp ieee754dp_bestnan(ieee754dp, ieee754dp);
70extern ieee754dp ieee754dp_format(int, int, u64);
71
72
73#define DPNORMRET2(s, e, m, name, a0, a1) \
74{ \
75 ieee754dp V = ieee754dp_format(s, e, m); \
76 if(TSTX()) \
77 return ieee754dp_xcpt(V, name, a0, a1); \
78 else \
79 return V; \
80}
81
82#define DPNORMRET1(s, e, m, name, a0) DPNORMRET2(s, e, m, name, a0, a0)