ieeefp.h revision 1834 
1/*-
2 * Copyright (c) 1990 Andrew Moore, Talke Studio
3 * All rights reserved.
4 *
5 * Redistribution and use in source and binary forms, with or without
6 * modification, are permitted provided that the following conditions
7 * are met:
8 * 1. Redistributions of source code must retain the above copyright
9 *    notice, this list of conditions and the following disclaimer.
10 * 2. Redistributions in binary form must reproduce the above copyright
11 *    notice, this list of conditions and the following disclaimer in the
12 *    documentation and/or other materials provided with the distribution.
13 * 3. All advertising materials mentioning features or use of this software
14 *    must display the following acknowledgement:
15 *	This product includes software developed by the University of
16 *	California, Berkeley and its contributors.
17 * 4. Neither the name of the University nor the names of its contributors
18 *    may be used to endorse or promote products derived from this software
19 *    without specific prior written permission.
20 *
21 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
22 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
23 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
24 * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
25 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
26 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
27 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
28 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
29 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
30 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
31 * SUCH DAMAGE.
32 *
33 * 	from: @(#) ieeefp.h 	1.0 (Berkeley) 9/23/93
34 *	$Id: ieeefp.h,v 1.2 1993/10/16 17:16:52 rgrimes Exp $
35 */
36
37/*
38 *	IEEE floating point type and constant definitions.
39 */
40
41#ifndef _IEEEFP_H_
42#define _IEEEFP_H_
43
44#ifdef __i386__
45
46/*
47 * FP rounding modes
48 */
49typedef enum {
50	FP_RN=0,	/* round to nearest */
51	FP_RM,		/* round down to minus infinity */
52	FP_RP,		/* round up to plus infinity */
53	FP_RZ		/* truncate */
54} fp_rnd_t;
55
56/*
57 * FP precison modes
58 */
59typedef enum {
60	FP_PS=0,	/* 24 bit (single-precsion) */
61	FP_PRS,		/* reserved */
62	FP_PD,		/* 53 bit (double-precision) */
63	FP_PE		/* 64 bit (extended-precsion) */
64} fp_prec_t;
65
66#define fp_except_t	int
67
68/*
69 * FP exception masks
70 */
71#define FP_X_INV	0x01	/* invalid operation */
72#define FP_X_DNML	0x02	/* denormal */
73#define FP_X_DZ		0x04	/* zero divide */
74#define FP_X_OFL	0x08	/* overflow */
75#define FP_X_UFL	0x10	/* underflow */
76#define FP_X_IMP	0x20	/* (im)precision */
77
78/*
79 * FP registers
80 */
81#define FP_MSKS_REG	0	/* exception masks */
82#define FP_PRC_REG	0	/* precision */
83#define FP_RND_REG	0	/* direction */
84#define FP_STKY_REG	1	/* sticky flags */
85
86/*
87 * FP register bit field masks
88 */
89#define FP_MSKS_FLD	0x3f	/* exception masks field */
90#define FP_PRC_FLD	0x300	/* precision control field */
91#define FP_RND_FLD	0xc00	/* round control field */
92#define FP_STKY_FLD	0x3f	/* sticky flags field */
93
94/*
95 * FP register bit field offsets
96 */
97#define FP_MSKS_OFF	0	/* exception masks offset */
98#define FP_PRC_OFF	8	/* precision control offset */
99#define FP_RND_OFF	10	/* round control offset */
100#define FP_STKY_OFF	0	/* sticky flags offset */
101
102#endif /* __i386__ */
103
104#endif /* !_IEEEFP_H_ */
105