2 * IEEE754 floating point
3 * double precision internal header file
6 * MIPS floating point support
7 * Copyright (C) 1994-2000 Algorithmics Ltd.
9 * ########################################################################
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.
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
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.
24 * ########################################################################
27 #include <linux/compiler.h>
29 #include "ieee754int.h"
31 #define assert(expr) ((void)0)
34 #define DP_EMIN (-1022)
39 #define DP_MBIT(x) ((u64)1 << (x))
40 #define DP_HIDDEN_BIT DP_MBIT(DP_FBITS)
41 #define DP_SIGN_BIT DP_MBIT(63)
43 #define DPSIGN(dp) (dp.sign)
44 #define DPBEXP(dp) (dp.bexp)
45 #define DPMANT(dp) (dp.mant)
47 static inline int ieee754dp_finite(union ieee754dp x)
49 return DPBEXP(x) != DP_EMAX + 1 + DP_EBIAS;
52 /* 3bit extended double precision sticky right shift */
53 #define XDPSRS(v,rs) \
54 ((rs > (DP_FBITS+3))?1:((v) >> (rs)) | ((v) << (64-(rs)) != 0))
57 (xe++, (xm = (xm >> 1) | (xm & 1)))
60 (((v) >> 1) | ((v) & 1))
62 /* convert denormal to normalized with extended exponent */
63 #define DPDNORMx(m,e) \
64 while ((m >> DP_FBITS) == 0) { m <<= 1; e--; }
65 #define DPDNORMX DPDNORMx(xm, xe)
66 #define DPDNORMY DPDNORMx(ym, ye)
68 static inline union ieee754dp builddp(int s, int bx, u64 m)
72 assert((s) == 0 || (s) == 1);
73 assert((bx) >= DP_EMIN - 1 + DP_EBIAS
74 && (bx) <= DP_EMAX + 1 + DP_EBIAS);
75 assert(((m) >> DP_FBITS) == 0);
84 extern int ieee754dp_isnan(union ieee754dp);
85 extern union ieee754dp __cold ieee754dp_nanxcpt(union ieee754dp);
86 extern union ieee754dp ieee754dp_format(int, int, u64);