Now available: The Design and Implementation of the FreeBSD Operating System (Second Edition)
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FreeBSD/Linux Kernel Cross Reference
sys/sys/float_ieee754.h
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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 52 extern 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_ */
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