ieee.h revision 1.10.68.1 1 1.10.68.1 uebayasi /* $NetBSD: ieee.h,v 1.10.68.1 2010/10/22 07:21:19 uebayasi Exp $ */
2 1.1 fredette
3 1.1 fredette /* $OpenBSD: ieee.h,v 1.1 1999/04/20 19:44:04 mickey Exp $ */
4 1.1 fredette
5 1.1 fredette /*
6 1.1 fredette * Copyright (c) 1992, 1993
7 1.1 fredette * The Regents of the University of California. All rights reserved.
8 1.1 fredette *
9 1.1 fredette * This software was developed by the Computer Systems Engineering group
10 1.1 fredette * at Lawrence Berkeley Laboratory under DARPA contract BG 91-66 and
11 1.1 fredette * contributed to Berkeley.
12 1.1 fredette *
13 1.1 fredette * All advertising materials mentioning features or use of this software
14 1.1 fredette * must display the following acknowledgement:
15 1.1 fredette * This product includes software developed by the University of
16 1.1 fredette * California, Lawrence Berkeley Laboratory.
17 1.1 fredette *
18 1.1 fredette * Redistribution and use in source and binary forms, with or without
19 1.1 fredette * modification, are permitted provided that the following conditions
20 1.1 fredette * are met:
21 1.1 fredette * 1. Redistributions of source code must retain the above copyright
22 1.1 fredette * notice, this list of conditions and the following disclaimer.
23 1.1 fredette * 2. Redistributions in binary form must reproduce the above copyright
24 1.1 fredette * notice, this list of conditions and the following disclaimer in the
25 1.1 fredette * documentation and/or other materials provided with the distribution.
26 1.2 agc * 3. Neither the name of the University nor the names of its contributors
27 1.1 fredette * may be used to endorse or promote products derived from this software
28 1.1 fredette * without specific prior written permission.
29 1.1 fredette *
30 1.1 fredette * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
31 1.1 fredette * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
32 1.1 fredette * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
33 1.1 fredette * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
34 1.1 fredette * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
35 1.1 fredette * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
36 1.1 fredette * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
37 1.1 fredette * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
38 1.1 fredette * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
39 1.1 fredette * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
40 1.1 fredette * SUCH DAMAGE.
41 1.1 fredette *
42 1.1 fredette * @(#)ieee.h 8.1 (Berkeley) 6/11/93
43 1.1 fredette */
44 1.1 fredette
45 1.1 fredette /*
46 1.1 fredette * ieee.h defines the machine-dependent layout of the machine's IEEE
47 1.1 fredette * floating point. It does *not* define (yet?) any of the rounding
48 1.1 fredette * mode bits, exceptions, and so forth.
49 1.1 fredette */
50 1.1 fredette
51 1.4 kleink #include <sys/ieee754.h>
52 1.1 fredette
53 1.7 kleink #ifdef _LP64
54 1.1 fredette #define EXT_EXPBITS 15
55 1.10 christos #define EXT_FRACHBITS 16
56 1.10 christos #define EXT_FRACHMBITS 32
57 1.10 christos #define EXT_FRACLMBITS 32
58 1.10 christos #define EXT_FRACLBITS 32
59 1.10 christos #define EXT_FRACBITS (EXT_FRACLBITS + EXT_FRACLMBITS + EXT_FRACHMBITS + EXT_FRACHBITS)
60 1.10 christos
61 1.10 christos #define EXT_TO_ARRAY32(u, a) do { \
62 1.10 christos (a)[0] = (uint32_t)(u).extu_ext.ext_fracl; \
63 1.10 christos (a)[1] = (uint32_t)(u).extu_ext.ext_fraclm; \
64 1.10 christos (a)[2] = (uint32_t)(u).extu_ext.ext_frachm; \
65 1.10 christos (a)[3] = (uint32_t)(u).extu_ext.ext_frach; \
66 1.10 christos } while(/*CONSTCOND*/0)
67 1.1 fredette
68 1.1 fredette struct ieee_ext {
69 1.1 fredette u_int ext_sign:1;
70 1.10 christos u_int ext_exp:EXT_EXPBITS;
71 1.10 christos u_int ext_frach:EXT_FRACHBITS;
72 1.1 fredette u_int ext_frachm;
73 1.1 fredette u_int ext_fraclm;
74 1.1 fredette u_int ext_fracl;
75 1.1 fredette };
76 1.1 fredette
77 1.1 fredette /*
78 1.1 fredette * Floats whose exponent is in [1..INFNAN) (of whatever type) are
79 1.1 fredette * `normal'. Floats whose exponent is INFNAN are either Inf or NaN.
80 1.1 fredette * Floats whose exponent is zero are either zero (iff all fraction
81 1.1 fredette * bits are zero) or subnormal values.
82 1.1 fredette *
83 1.8 kleink * A NaN is a `signalling NaN' if its QUIETNAN bit is set in its
84 1.8 kleink * high fraction; if the bit is clear, it is a `quiet NaN'.
85 1.1 fredette */
86 1.10.68.1 uebayasi #define EXT_EXP_INFNAN 0x7fff
87 1.10.68.1 uebayasi #define EXT_EXP_INF 0x7fff
88 1.10.68.1 uebayasi #define EXT_EXP_NAN 0x7fff
89 1.1 fredette
90 1.1 fredette #if 0
91 1.8 kleink #define SNG_QUIETNAN (1 << 22)
92 1.8 kleink #define DBL_QUIETNAN (1 << 19)
93 1.1 fredette #define EXT_QUIETNAN (1 << 15)
94 1.1 fredette #endif
95 1.1 fredette
96 1.1 fredette /*
97 1.1 fredette * Exponent biases.
98 1.1 fredette */
99 1.1 fredette #define EXT_EXP_BIAS 16383
100 1.5 kleink
101 1.5 kleink /*
102 1.5 kleink * Convenience data structures.
103 1.5 kleink */
104 1.5 kleink union ieee_ext_u {
105 1.5 kleink long double extu_ld;
106 1.6 kleink struct ieee_ext extu_ext;
107 1.5 kleink };
108 1.10.68.1 uebayasi
109 1.10.68.1 uebayasi #define extu_exp extu_ext.ext_exp
110 1.10.68.1 uebayasi #define extu_sign extu_ext.ext_sign
111 1.10.68.1 uebayasi #define extu_fracl extu_ext.ext_fracl
112 1.10.68.1 uebayasi #define extu_frach extu_ext.ext_frach
113 1.10.68.1 uebayasi
114 1.10.68.1 uebayasi #define LDBL_NBIT 0x80000000
115 1.10.68.1 uebayasi #define mask_nbit_l(u) ((u).extu_frach &= ~LDBL_NBIT)
116 1.10.68.1 uebayasi
117 1.7 kleink #endif /* _LP64 */
118