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_ */