The Design and Implementation of the FreeBSD Operating System, Second Edition
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 1.6 2003/10/26 16:44:20 kleink 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 #ifndef FLT_ROUNDS
   46 __BEGIN_DECLS
   47 extern int __flt_rounds __P((void));
   48 __END_DECLS
   49 #define FLT_ROUNDS      __flt_rounds()
   50 #endif
   51 
   52 #if !defined(_ANSI_SOURCE) && !defined(_POSIX_C_SOURCE) && \
   53     !defined(_XOPEN_SOURCE) || \
   54     ((__STDC_VERSION__ - 0) >= 199901L) || \
   55     ((_POSIX_C_SOURCE - 0) >= 200112L) || \
   56     ((_XOPEN_SOURCE  - 0) >= 600) || \
   57     defined(_ISOC99_SOURCE) || defined(_NETBSD_SOURCE)
   58 #ifndef FLT_EVAL_METHOD
   59 #if __GNUC_PREREQ__(3, 3)
   60 #define FLT_EVAL_METHOD __FLT_EVAL_METHOD__
   61 #endif /* GCC >= 3.3 */
   62 #endif /* defined(FLT_EVAL_METHOD) */
   63 #endif /* !defined(_ANSI_SOURCE) && ... */
   64 
   65 #define FLT_RADIX       2               /* b */
   66 
   67 #define FLT_MANT_DIG    24              /* p */
   68 #define FLT_EPSILON     1.19209290E-7F  /* b**(1-p) */
   69 #define FLT_DIG         6               /* floor((p-1)*log10(b))+(b == 10) */
   70 #define FLT_MIN_EXP     (-125)          /* emin */
   71 #define FLT_MIN         1.17549435E-38F /* b**(emin-1) */
   72 #define FLT_MIN_10_EXP  (-37)           /* ceil(log10(b**(emin-1))) */
   73 #define FLT_MAX_EXP     128             /* emax */
   74 #define FLT_MAX         3.40282347E+38F /* (1-b**(-p))*b**emax */
   75 #define FLT_MAX_10_EXP  38              /* floor(log10((1-b**(-p))*b**emax)) */
   76 
   77 #define DBL_MANT_DIG    53
   78 #define DBL_EPSILON     2.2204460492503131E-16
   79 #define DBL_DIG         15
   80 #define DBL_MIN_EXP     (-1021)
   81 #define DBL_MIN         2.2250738585072014E-308
   82 #define DBL_MIN_10_EXP  (-307)
   83 #define DBL_MAX_EXP     1024
   84 #define DBL_MAX         1.7976931348623157E+308
   85 #define DBL_MAX_10_EXP  308
   86 
   87 /*
   88  * If no extended-precision type is defined by the machine-dependent
   89  * header including this, default to `long double' being double-precision.
   90  */
   91 #ifndef LDBL_MANT_DIG
   92 #define LDBL_MANT_DIG   DBL_MANT_DIG
   93 #define LDBL_EPSILON    DBL_EPSILON
   94 #define LDBL_DIG        DBL_DIG
   95 #define LDBL_MIN_EXP    DBL_MIN_EXP
   96 #define LDBL_MIN        DBL_MIN
   97 #define LDBL_MIN_10_EXP DBL_MIN_10_EXP
   98 #define LDBL_MAX_EXP    DBL_MAX_EXP
   99 #define LDBL_MAX        DBL_MAX
  100 #define LDBL_MAX_10_EXP DBL_MAX_10_EXP
  101 #if !defined(_ANSI_SOURCE) && !defined(_POSIX_C_SOURCE) && \
  102     !defined(_XOPEN_SOURCE) || \
  103     ((__STDC_VERSION__ - 0) >= 199901L) || \
  104     ((_POSIX_C_SOURCE - 0) >= 200112L) || \
  105     ((_XOPEN_SOURCE  - 0) >= 600) || \
  106     defined(_ISOC99_SOURCE) || defined(_NETBSD_SOURCE)
  107 #define DECIMAL_DIG     17              /* ceil((1+p*log10(b))-(b==10) */
  108 #endif /* !defined(_ANSI_SOURCE) && ... */
  109 #endif /* LDBL_MANT_DIG */
  110 
  111 #endif  /* _SYS_FLOAT_IEEE754_H_ */

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