Linux 4.1.18
[linux/fpc-iii.git] / arch / mips / math-emu / ieee754sp.h
blob374a3f00a589b5c8d92db80fce1729edb9426130
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.
9 * This program is free software; you can distribute it and/or modify it
10 * under the terms of the GNU General Public License (Version 2) as
11 * published by the Free Software Foundation.
13 * This program is distributed in the hope it will be useful, but WITHOUT
14 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
15 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
16 * for more details.
18 * You should have received a copy of the GNU General Public License along
19 * with this program; if not, write to the Free Software Foundation, Inc.,
20 * 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
23 #include <linux/compiler.h>
25 #include "ieee754int.h"
27 #define assert(expr) ((void)0)
29 #define SP_EBIAS 127
30 #define SP_EMIN (-126)
31 #define SP_EMAX 127
32 #define SP_FBITS 23
33 #define SP_MBITS 23
35 #define SP_MBIT(x) ((u32)1 << (x))
36 #define SP_HIDDEN_BIT SP_MBIT(SP_FBITS)
37 #define SP_SIGN_BIT SP_MBIT(31)
39 #define SPSIGN(sp) (sp.sign)
40 #define SPBEXP(sp) (sp.bexp)
41 #define SPMANT(sp) (sp.mant)
43 static inline int ieee754sp_finite(union ieee754sp x)
45 return SPBEXP(x) != SP_EMAX + 1 + SP_EBIAS;
48 /* 3bit extended single precision sticky right shift */
49 #define SPXSRSXn(rs) \
50 (xe += rs, \
51 xm = (rs > (SP_FBITS+3))?1:((xm) >> (rs)) | ((xm) << (32-(rs)) != 0))
53 #define SPXSRSX1() \
54 (xe++, (xm = (xm >> 1) | (xm & 1)))
56 #define SPXSRSYn(rs) \
57 (ye+=rs, \
58 ym = (rs > (SP_FBITS+3))?1:((ym) >> (rs)) | ((ym) << (32-(rs)) != 0))
60 #define SPXSRSY1() \
61 (ye++, (ym = (ym >> 1) | (ym & 1)))
63 /* convert denormal to normalized with extended exponent */
64 #define SPDNORMx(m,e) \
65 while ((m >> SP_FBITS) == 0) { m <<= 1; e--; }
66 #define SPDNORMX SPDNORMx(xm, xe)
67 #define SPDNORMY SPDNORMx(ym, ye)
69 static inline union ieee754sp buildsp(int s, int bx, unsigned m)
71 union ieee754sp r;
73 assert((s) == 0 || (s) == 1);
74 assert((bx) >= SP_EMIN - 1 + SP_EBIAS
75 && (bx) <= SP_EMAX + 1 + SP_EBIAS);
76 assert(((m) >> SP_FBITS) == 0);
78 r.sign = s;
79 r.bexp = bx;
80 r.mant = m;
82 return r;
85 extern union ieee754sp __cold ieee754sp_nanxcpt(union ieee754sp);
86 extern union ieee754sp ieee754sp_format(int, int, unsigned);