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/arch/mips/math-emu/ieee754dp.h

https://bitbucket.org/evzijst/gittest
C Header | 83 lines | 41 code | 14 blank | 28 comment | 9 complexity | 4f651907f469b0c0df57d6794466fb7d MD5 | raw file
 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 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
49static __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
64extern int ieee754dp_isnan(ieee754dp);
65extern int ieee754dp_issnan(ieee754dp);
66extern int ieee754si_xcpt(int, const char *, ...);
67extern s64 ieee754di_xcpt(s64, const char *, ...);
68extern ieee754dp ieee754dp_xcpt(ieee754dp, const char *, ...);
69extern ieee754dp ieee754dp_nanxcpt(ieee754dp, const char *, ...);
70extern ieee754dp ieee754dp_bestnan(ieee754dp, ieee754dp);
71extern 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)