xref: /freebsd/sys/i386/include/ieeefp.h (revision ae83180158c4c937f170e31eff311b18c0286a93)
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  * $FreeBSD$
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  */
47 typedef 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  */
57 typedef 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 #define FP_X_STK	0x40	/* stack fault */
76 
77 /*
78  * FP registers
79  */
80 #define FP_MSKS_REG	0	/* exception masks */
81 #define FP_PRC_REG	0	/* precision */
82 #define FP_RND_REG	0	/* direction */
83 #define FP_STKY_REG	1	/* sticky flags */
84 
85 /*
86  * FP register bit field masks
87  */
88 #define FP_MSKS_FLD	0x3f	/* exception masks field */
89 #define FP_PRC_FLD	0x300	/* precision control field */
90 #define FP_RND_FLD	0xc00	/* round control field */
91 #define FP_STKY_FLD	0x3f	/* sticky flags field */
92 
93 /*
94  * FP register bit field offsets
95  */
96 #define FP_MSKS_OFF	0	/* exception masks offset */
97 #define FP_PRC_OFF	8	/* precision control offset */
98 #define FP_RND_OFF	10	/* round control offset */
99 #define FP_STKY_OFF	0	/* sticky flags offset */
100 
101 #endif /* !_MACHINE_IEEEFP_H_ */
102