xref: /freebsd/lib/libc/include/fpmath.h (revision 1de7b4b805ddbf2429da511c053686ac4591ed89)
1 /*-
2  * SPDX-License-Identifier: BSD-2-Clause-FreeBSD
3  *
4  * Copyright (c) 2003 Mike Barcroft <mike@FreeBSD.org>
5  * Copyright (c) 2002 David Schultz <das@FreeBSD.ORG>
6  * All rights reserved.
7  *
8  * Redistribution and use in source and binary forms, with or without
9  * modification, are permitted provided that the following conditions
10  * are met:
11  * 1. Redistributions of source code must retain the above copyright
12  *    notice, this list of conditions and the following disclaimer.
13  * 2. Redistributions in binary form must reproduce the above copyright
14  *    notice, this list of conditions and the following disclaimer in the
15  *    documentation and/or other materials provided with the distribution.
16  *
17  * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
18  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
19  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
20  * ARE DISCLAIMED.  IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
21  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
22  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
23  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
24  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
25  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
26  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
27  * SUCH DAMAGE.
28  *
29  * $FreeBSD$
30  */
31 
32 #include <sys/endian.h>
33 #include "_fpmath.h"
34 
35 #ifndef _IEEE_WORD_ORDER
36 #define	_IEEE_WORD_ORDER	_BYTE_ORDER
37 #endif
38 
39 union IEEEf2bits {
40 	float	f;
41 	struct {
42 #if _BYTE_ORDER == _LITTLE_ENDIAN
43 		unsigned int	man	:23;
44 		unsigned int	exp	:8;
45 		unsigned int	sign	:1;
46 #else /* _BIG_ENDIAN */
47 		unsigned int	sign	:1;
48 		unsigned int	exp	:8;
49 		unsigned int	man	:23;
50 #endif
51 	} bits;
52 };
53 
54 #define	DBL_MANH_SIZE	20
55 #define	DBL_MANL_SIZE	32
56 
57 union IEEEd2bits {
58 	double	d;
59 	struct {
60 #if _BYTE_ORDER == _LITTLE_ENDIAN
61 #if _IEEE_WORD_ORDER == _LITTLE_ENDIAN
62 		unsigned int	manl	:32;
63 #endif
64 		unsigned int	manh	:20;
65 		unsigned int	exp	:11;
66 		unsigned int	sign	:1;
67 #if _IEEE_WORD_ORDER == _BIG_ENDIAN
68 		unsigned int	manl	:32;
69 #endif
70 #else /* _BIG_ENDIAN */
71 		unsigned int	sign	:1;
72 		unsigned int	exp	:11;
73 		unsigned int	manh	:20;
74 		unsigned int	manl	:32;
75 #endif
76 	} bits;
77 };
78