1/* $NetBSD: float_ieee754.h,v 1.11 2013/06/18 20:17:19 christos Exp $ */
2
3/*
4 * Copyright (c) 1992, 1993
5 * The Regents of the University of California. All rights reserved.
6 *
7 * Redistribution and use in source and binary forms, with or without
8 * modification, are permitted provided that the following conditions
9 * are met:
10 * 1. Redistributions of source code must retain the above copyright
11 * notice, this list of conditions and the following disclaimer.
12 * 2. Redistributions in binary form must reproduce the above copyright
13 * notice, this list of conditions and the following disclaimer in the
14 * documentation and/or other materials provided with the distribution.
15 * 3. Neither the name of the University nor the names of its contributors
16 * may be used to endorse or promote products derived from this software
17 * without specific prior written permission.
18 *
19 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
20 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
21 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
22 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
23 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
24 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
25 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
26 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
27 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
28 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
29 * SUCH DAMAGE.
30 *
31 * @(#)float.h 8.1 (Berkeley) 6/10/93
32 */
33
34/*
35 * NOTICE: This is not a standalone file. To use it, #include it in
36 * your port's float.h header.
37 */
38
39#ifndef _SYS_FLOAT_IEEE754_H_
40#define _SYS_FLOAT_IEEE754_H_
41
42#include <sys/cdefs.h>
43#include <sys/featuretest.h>
44
45/*
46 * feature macro to test for IEEE754
47 */
48#define _FLOAT_IEEE754 1
49
50#if !defined(__ASSEMBLER__) && !defined(FLT_ROUNDS)
51__BEGIN_DECLS
52extern int __flt_rounds(void);
53__END_DECLS
54#define FLT_ROUNDS __flt_rounds()
55#endif
56
57#if !defined(_ANSI_SOURCE) && !defined(_POSIX_C_SOURCE) && \
58 !defined(_XOPEN_SOURCE) || \
59 ((__STDC_VERSION__ - 0) >= 199901L) || \
60 ((_POSIX_C_SOURCE - 0) >= 200112L) || \
61 ((_XOPEN_SOURCE - 0) >= 600) || \
62 defined(_ISOC99_SOURCE) || defined(_NETBSD_SOURCE)
63#ifndef FLT_EVAL_METHOD
64#if __GNUC_PREREQ__(3, 3)
65#define FLT_EVAL_METHOD __FLT_EVAL_METHOD__
66#endif /* GCC >= 3.3 */
67#endif /* defined(FLT_EVAL_METHOD) */
68#endif /* !defined(_ANSI_SOURCE) && ... */
69
70#if __GNUC_PREREQ__(3, 3)
71/*
72 * GCC 3,3 and later provide builtins for the FLT, DBL, and LDBL constants.
73 */
74#define FLT_RADIX __FLT_RADIX__
75
76#define FLT_MANT_DIG __FLT_MANT_DIG__
77#define FLT_EPSILON __FLT_EPSILON__
78#define FLT_DIG __FLT_DIG__
79#define FLT_MIN_EXP __FLT_MIN_EXP__
80#define FLT_MIN __FLT_MIN__
81#define FLT_MIN_10_EXP __FLT_MIN_10_EXP__
82#define FLT_MAX_EXP __FLT_MAX_EXP__
83#define FLT_MAX __FLT_MAX__
84#define FLT_MAX_10_EXP __FLT_MAX_10_EXP__
85
86#define DBL_MANT_DIG __DBL_MANT_DIG__
87#define DBL_EPSILON __DBL_EPSILON__
88#define DBL_DIG __DBL_DIG__
89#define DBL_MIN_EXP __DBL_MIN_EXP__
90#define DBL_MIN __DBL_MIN__
91#define DBL_MIN_10_EXP __DBL_MIN_10_EXP__
92#define DBL_MAX_EXP __DBL_MAX_EXP__
93#define DBL_MAX __DBL_MAX__
94#define DBL_MAX_10_EXP __DBL_MAX_10_EXP__
95#else /* GCC < 3.3 */
96#define FLT_RADIX 2 /* b */
97
98#define FLT_MANT_DIG 24 /* p */
99#define FLT_DIG 6 /* floor((p-1)*log10(b))+(b == 10) */
100#define FLT_MIN_EXP (-125) /* emin */
101#define FLT_MIN_10_EXP (-37) /* ceil(log10(b**(emin-1))) */
102#define FLT_MAX_EXP 128 /* emax */
103#define FLT_MAX_10_EXP 38 /* floor(log10((1-b**(-p))*b**emax)) */
104#if __STDC_VERSION__ >= 199901L
105#define FLT_EPSILON 0x1.0p-23F
106#define FLT_MIN 0x1.0p-126F
107#define FLT_MAX 0x1.fffffep+127F
108#else
109#define FLT_EPSILON 1.19209290E-7F /* b**(1-p) */
110#define FLT_MIN 1.17549435E-38F /* b**(emin-1) */
111#define FLT_MAX 3.40282347E+38F /* (1-b**(-p))*b**emax */
112#endif
113
114#define DBL_MANT_DIG 53
115#define DBL_DIG 15
116#define DBL_MIN_EXP (-1021)
117#define DBL_MIN_10_EXP (-307)
118#define DBL_MAX_EXP 1024
119#define DBL_MAX_10_EXP 308
120
121#if __STDC_VERSION__ >= 199901L
122#define DBL_EPSILON 0x1.0p-52
123#define DBL_MIN 0x1.0p-1022
124#define DBL_MAX 0x1.fffffffffffffp+1023
125#else
126#define DBL_EPSILON 2.2204460492503131E-16
127#define DBL_MIN 2.2250738585072014E-308
128#define DBL_MAX 1.7976931348623157E+308
129#endif
130#endif /* GCC < 3.3 */
131/*
132 * If no extended-precision type is defined by the machine-dependent
133 * header including this, default to `long double' being double-precision.
134 */
135#ifndef LDBL_MANT_DIG
136#define LDBL_MANT_DIG DBL_MANT_DIG
137#define LDBL_EPSILON DBL_EPSILON
138#define LDBL_DIG DBL_DIG
139#define LDBL_MIN_EXP DBL_MIN_EXP
140#define LDBL_MIN DBL_MIN
141#define LDBL_MIN_10_EXP DBL_MIN_10_EXP
142#define LDBL_MAX_EXP DBL_MAX_EXP
143#define LDBL_MAX DBL_MAX
144#define LDBL_MAX_10_EXP DBL_MAX_10_EXP
145#if !defined(_ANSI_SOURCE) && !defined(_POSIX_C_SOURCE) && \
146 !defined(_XOPEN_SOURCE) || \
147 ((__STDC_VERSION__ - 0) >= 199901L) || \
148 ((_POSIX_C_SOURCE - 0) >= 200112L) || \
149 ((_XOPEN_SOURCE - 0) >= 600) || \
150 defined(_ISOC99_SOURCE) || defined(_NETBSD_SOURCE)
151#if __GNUC_PREREQ__(3, 3)
152#define DECIMAL_DIG __DECIMAL_DIG__
153#else
154#define DECIMAL_DIG 17 /* ceil((1+p*log10(b))-(b==10) */
155#endif
156#endif /* !defined(_ANSI_SOURCE) && ... */
157#endif /* LDBL_MANT_DIG */
158
159#endif /* _SYS_FLOAT_IEEE754_H_ */