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2aa62f2b | 1 | /* $NetBSD: ieee.h,v 1.9.32.1 2007/05/07 19:49:10 pavel Exp $ */\r |
2 | \r | |
3 | /*\r | |
4 | * Copyright (c) 1992, 1993\r | |
5 | * The Regents of the University of California. All rights reserved.\r | |
6 | *\r | |
7 | * This software was developed by the Computer Systems Engineering group\r | |
8 | * at Lawrence Berkeley Laboratory under DARPA contract BG 91-66 and\r | |
9 | * contributed to Berkeley.\r | |
10 | *\r | |
11 | * All advertising materials mentioning features or use of this software\r | |
12 | * must display the following acknowledgement:\r | |
13 | * This product includes software developed by the University of\r | |
14 | * California, Lawrence Berkeley Laboratory.\r | |
15 | *\r | |
16 | * Redistribution and use in source and binary forms, with or without\r | |
17 | * modification, are permitted provided that the following conditions\r | |
18 | * are met:\r | |
19 | * 1. Redistributions of source code must retain the above copyright\r | |
20 | * notice, this list of conditions and the following disclaimer.\r | |
21 | * 2. Redistributions in binary form must reproduce the above copyright\r | |
22 | * notice, this list of conditions and the following disclaimer in the\r | |
23 | * documentation and/or other materials provided with the distribution.\r | |
24 | * 3. Neither the name of the University nor the names of its contributors\r | |
25 | * may be used to endorse or promote products derived from this software\r | |
26 | * without specific prior written permission.\r | |
27 | *\r | |
28 | * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND\r | |
29 | * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE\r | |
30 | * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE\r | |
31 | * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE\r | |
32 | * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL\r | |
33 | * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS\r | |
34 | * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)\r | |
35 | * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT\r | |
36 | * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY\r | |
37 | * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF\r | |
38 | * SUCH DAMAGE.\r | |
39 | *\r | |
40 | * @(#)ieee.h 8.1 (Berkeley) 6/11/93\r | |
41 | */\r | |
42 | \r | |
43 | /*\r | |
44 | * ieee.h defines the machine-dependent layout of the machine's IEEE\r | |
45 | * floating point. It does *not* define (yet?) any of the rounding\r | |
46 | * mode bits, exceptions, and so forth.\r | |
47 | */\r | |
48 | \r | |
49 | #include <sys/ieee754.h>\r | |
50 | \r | |
51 | #define EXT_EXPBITS 15\r | |
52 | #define EXT_FRACHBITS 32\r | |
53 | #define EXT_FRACLBITS 32\r | |
54 | #define EXT_FRACBITS (EXT_FRACLBITS + EXT_FRACHBITS)\r | |
55 | \r | |
56 | #define EXT_TO_ARRAY32(u, a) do { \\r | |
57 | (a)[0] = (uint32_t)(u).extu_ext.ext_fracl; \\r | |
58 | (a)[1] = (uint32_t)(u).extu_ext.ext_frach; \\r | |
59 | } while(/*CONSTCOND*/0)\r | |
60 | \r | |
61 | /*\r | |
62 | * struct ieee_ext is the raw storage layout of the 80-bit\r | |
63 | * extended-precision type as implemented by the FPU. Per the\r | |
64 | * respective ABI specifications, it is followed by a tail padding of\r | |
65 | *\r | |
66 | * amd64: 48 bits,\r | |
67 | * i386: 16 bits.\r | |
68 | */\r | |
69 | struct ieee_ext {\r | |
70 | u_int ext_fracl:EXT_FRACLBITS;\r | |
71 | u_int ext_frach:EXT_FRACHBITS;\r | |
72 | #if 0\r | |
73 | u_int ext_int:1;\r | |
74 | #endif\r | |
75 | u_int ext_exp:EXT_EXPBITS;\r | |
76 | u_int ext_sign:1;\r | |
77 | };\r | |
78 | \r | |
79 | /*\r | |
80 | * Floats whose exponent is in [1..INFNAN) (of whatever type) are\r | |
81 | * `normal'. Floats whose exponent is INFNAN are either Inf or NaN.\r | |
82 | * Floats whose exponent is zero are either zero (iff all fraction\r | |
83 | * bits are zero) or subnormal values.\r | |
84 | *\r | |
85 | * A NaN is a `signalling NaN' if its QUIETNAN bit is clear in its\r | |
86 | * high fraction; if the bit is set, it is a `quiet NaN'.\r | |
87 | */\r | |
88 | #define EXT_EXP_INFNAN 32767\r | |
89 | \r | |
90 | #if 0\r | |
91 | #define SNG_QUIETNAN (1 << 22)\r | |
92 | #define DBL_QUIETNAN (1 << 19)\r | |
93 | #define EXT_QUIETNAN (1 << 30)\r | |
94 | #endif\r | |
95 | \r | |
96 | /*\r | |
97 | * Exponent biases.\r | |
98 | */\r | |
99 | #define EXT_EXP_BIAS 16383\r | |
100 | \r | |
101 | /*\r | |
102 | * Convenience data structures.\r | |
103 | */\r | |
104 | union ieee_ext_u {\r | |
105 | long double extu_ld;\r | |
106 | struct ieee_ext extu_ext;\r | |
107 | };\r |