1 /* $NetBSD: ieee.h,v 1.7 2003/10/26 21:46:46 kleink Exp $ */
2 /* $DragonFly: src/sys/amd64/include/Attic/ieee.h,v 1.1 2004/12/30 16:00:22 asmodai Exp $ */
5 * Copyright (c) 1992, 1993
6 * The Regents of the University of California. All rights reserved.
8 * This software was developed by the Computer Systems Engineering group
9 * at Lawrence Berkeley Laboratory under DARPA contract BG 91-66 and
10 * contributed to Berkeley.
12 * All advertising materials mentioning features or use of this software
13 * must display the following acknowledgement:
14 * This product includes software developed by the University of
15 * California, Lawrence Berkeley Laboratory.
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18 * modification, are permitted provided that the following conditions
20 * 1. Redistributions of source code must retain the above copyright
21 * notice, this list of conditions and the following disclaimer.
22 * 2. Redistributions in binary form must reproduce the above copyright
23 * notice, this list of conditions and the following disclaimer in the
24 * documentation and/or other materials provided with the distribution.
25 * 3. Neither the name of the University nor the names of its contributors
26 * may be used to endorse or promote products derived from this software
27 * without specific prior written permission.
29 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
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41 * @(#)ieee.h 8.1 (Berkeley) 6/11/93
45 * ieee.h defines the machine-dependent layout of the machine's IEEE
46 * floating point. It does *not* define (yet?) any of the rounding
47 * mode bits, exceptions, and so forth.
50 #include <sys/ieee754.h>
52 #define EXT_EXPBITS 15
53 #define EXT_FRACBITS 64
56 * struct ieee_ext is the raw storage layout of the 80-bit
57 * extended-precision type as implemented by the FPU. Per the
58 * respective ABI specifications, it is followed by a tail padding of
72 * Floats whose exponent is in [1..INFNAN) (of whatever type) are
73 * `normal'. Floats whose exponent is INFNAN are either Inf or NaN.
74 * Floats whose exponent is zero are either zero (iff all fraction
75 * bits are zero) or subnormal values.
77 * A NaN is a `signalling NaN' if its QUIETNAN bit is clear in its
78 * high fraction; if the bit is set, it is a `quiet NaN'.
80 #define EXT_EXP_INFNAN 32767
83 #define EXT_QUIETNAN (1 << 30)
89 #define EXT_EXP_BIAS 16383
92 * Convenience data structures.
96 struct ieee_ext extu_ext;