ieeefp.h revision 22975 
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 *	$Id$
35 */
36
37/*
38 *	IEEE floating point type and constant definitions.
39 */
40
41#ifndef _MACHINE_IEEEFP_H_
42#define _MACHINE_IEEEFP_H_
43
44/*
45 * FP rounding modes
46 */
47typedef enum {
48	FP_RN=0,	/* round to nearest */
49	FP_RM,		/* round down to minus infinity */
50	FP_RP,		/* round up to plus infinity */
51	FP_RZ		/* truncate */
52} fp_rnd_t;
53
54/*
55 * FP precision modes
56 */
57typedef enum {
58	FP_PS=0,	/* 24 bit (single-precision) */
59	FP_PRS,		/* reserved */
60	FP_PD,		/* 53 bit (double-precision) */
61	FP_PE		/* 64 bit (extended-precision) */
62} fp_prec_t;
63
64#define fp_except_t	int
65
66/*
67 * FP exception masks
68 */
69#define FP_X_INV	0x01	/* invalid operation */
70#define FP_X_DNML	0x02	/* denormal */
71#define FP_X_DZ		0x04	/* zero divide */
72#define FP_X_OFL	0x08	/* overflow */
73#define FP_X_UFL	0x10	/* underflow */
74#define FP_X_IMP	0x20	/* (im)precision */
75
76/*
77 * FP registers
78 */
79#define FP_MSKS_REG	0	/* exception masks */
80#define FP_PRC_REG	0	/* precision */
81#define FP_RND_REG	0	/* direction */
82#define FP_STKY_REG	1	/* sticky flags */
83
84/*
85 * FP register bit field masks
86 */
87#define FP_MSKS_FLD	0x3f	/* exception masks field */
88#define FP_PRC_FLD	0x300	/* precision control field */
89#define FP_RND_FLD	0xc00	/* round control field */
90#define FP_STKY_FLD	0x3f	/* sticky flags field */
91
92/*
93 * FP register bit field offsets
94 */
95#define FP_MSKS_OFF	0	/* exception masks offset */
96#define FP_PRC_OFF	8	/* precision control offset */
97#define FP_RND_OFF	10	/* round control offset */
98#define FP_STKY_OFF	0	/* sticky flags offset */
99
100#endif /* !_MACHINE_IEEEFP_H_ */
101