/****************************************************************************
* include/nuttx/float.h
*
* Copyright (C) 2012 Gregory Nutt. All rights reserved.
* Author: Gregory Nutt <gnutt@nuttx.org>
*
* Reference: http://pubs.opengroup.org/onlinepubs/009695399/basedefs/float.h.html
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
*
* 1. Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* 2. Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in
* the documentation and/or other materials provided with the
* distribution.
* 3. Neither the name NuttX nor the names of its contributors may be
* used to endorse or promote products derived from this software
* without specific prior written permission.
*
* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
* "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
* LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS
* FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE
* COPYRIGHT OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT,
* INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING,
* BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS
* OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED
* AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN
* ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
* POSSIBILITY OF SUCH DAMAGE.
*
****************************************************************************/
#ifndef __INCLUDE_NUTTX_FLOAT_H
#define __INCLUDE_NUTTX_FLOAT_H
/* TODO: These values could vary with architectures toolchains. This
* logic should be move at least to the include/arch directory.
*/
/****************************************************************************
* Included Files
****************************************************************************/
#include <nuttx/config.h>
#include <nuttx/compiler.h>
/****************************************************************************
* Pre-processor Definitions
****************************************************************************/
/* Radix of exponent representation, b. */
#define FLT_RADIX 2
/* Number of base-FLT_RADIX digits in the floating-point significand, p. */
#define FLT_MANT_DIG 24
#if CONFIG_HAVE_DOUBLE
# define DBL_MANT_DIG 53
#else
# define DBL_MANT_DIG FLT_MANT_DIG
#endif
#ifdef CONFIG_HAVE_LONG_DOUBLE
# define LDBL_MANT_DIG DBL_MANT_DIG /* FIX ME */
#else
# define LDBL_MANT_DIG DBL_MANT_DIG
#endif
/* Number of decimal digits, n, such that any floating-point number in the
* widest supported floating type with pmax radix b digits can be rounded
* to a floating-point number with n decimal digits and back again without
* change to the value.
*/
#define DECIMAL_DIG 10
/* Number of decimal digits, q, such that any floating-point number with q
* decimal digits can be rounded into a floating-point number with p radix
* b digits and back again without change to the q decimal digits.
*/
#define FLT_DIG 6
#if CONFIG_HAVE_DOUBLE
# define DBL_DIG 15 /* 10 */
#else
# define DBL_DIG FLT_DIG
#endif
#ifdef CONFIG_HAVE_LONG_DOUBLE
# define LDBL_DIG DBL_DIG /* FIX ME */
#else
# define LDBL_DIG DBL_DIG
#endif
/* Minimum negative integer such that FLT_RADIX raised to that power minus
* 1 is a normalized floating-point number, emin.
*/
#define FLT_MIN_EXP (-125)
#if CONFIG_HAVE_DOUBLE
# define DBL_MIN_EXP (-1021)
#else
# define DBL_MIN_EXP FLT_MIN_EXP
#endif
#ifdef CONFIG_HAVE_LONG_DOUBLE
# define LDBL_MIN_EXP DBL_MIN_EXP /* FIX ME */
#else
# define LDBL_MIN_EXP DBL_MIN_EXP
#endif
/* inimum negative integer such that 10 raised to that power is in the range
* of normalized floating-point numbers.
*/
#define FLT_MIN_10_EXP (-37)
#if CONFIG_HAVE_DOUBLE
# define DBL_MIN_10_EXP (-307) /* -37 */
#else
# define DBL_MIN_10_EXP FLT_MIN_10_EXP
#endif
#ifdef CONFIG_HAVE_LONG_DOUBLE
# define LDBL_MIN_10_EXP DBL_MIN_10_EXP /* FIX ME */
#else
# define LDBL_MIN_10_EXP DBL_MIN_10_EXP
#endif
/* Maximum integer such that FLT_RADIX raised to that power minus 1 is a
* representable finite floating-point number, emax.
*/
#define FLT_MAX_EXP 128
#if CONFIG_HAVE_DOUBLE
# define DBL_MAX_EXP 1024
#else
# define DBL_MAX_EXP FLT_MAX_EXP
#endif
#ifdef CONFIG_HAVE_LONG_DOUBLE
# define LDBL_MAX_EXP DBL_MAX_EXP /* FIX ME */
#else
# define LDBL_MAX_EXP DBL_MAX_EXP
#endif
/* Maximum integer such that 10 raised to that power is in the range of
* representable finite floating-point numbers.
*/
#define FLT_MAX_10_EXP 38 /* 37 */
#if CONFIG_HAVE_DOUBLE
# define DBL_MAX_10_EXP 308 /* 37 */
#else
# define DBL_MAX_10_EXP FLT_MAX_10_EXP
#endif
#ifdef CONFIG_HAVE_LONG_DOUBLE
# define LDBL_MAX_10_EXP DBL_MAX_10_EXP /* FIX ME */
#else
# define LDBL_MAX_10_EXP DBL_MAX_10_EXP
#endif
/* Maximum representable finite floating-point number. */
#define FLT_MAX 3.40282347e+38F /* 1E+37 */
#if CONFIG_HAVE_DOUBLE
# define DBL_MAX 1.7976931348623157e+308 /* 1E+37 */
#else
# define DBL_MAX FLT_MAX
#endif
#ifdef CONFIG_HAVE_LONG_DOUBLE
# define LDBL_MAX DBL_MAX /* FIX ME */
#else
# define LDBL_MAX DBL_MAX
#endif
/* The difference between 1 and the least value greater than 1 that is
* representable in the given floating-point type, b1-p.
*/
#define FLT_EPSILON 1.1920929e-07F /* 1E-5 */
#if CONFIG_HAVE_DOUBLE
# define DBL_EPSILON 2.2204460492503131e-16 /* 1E-9 */
#else
# define DBL_EPSILON FLT_EPSILON
#endif
#ifdef CONFIG_HAVE_LONG_DOUBLE
# define LDBL_EPSILON DBL_EPSILON /* FIX ME */
#else
# define LDBL_EPSILON DBL_EPSILON
#endif
/* Minimum normalized positive floating-point number, bemin -1. */
#define FLT_MIN 1.17549435e-38F /* 1E-37 */
#if CONFIG_HAVE_DOUBLE
#define DBL_MIN 2.2250738585072014e-308 /* 1E-37 */
#else
# define DBL_MIN FLT_MIN
#endif
#ifdef CONFIG_HAVE_LONG_DOUBLE
# define LDBL_MIN DBL_MIN /* FIX ME */
#else
# define LDBL_MIN DBL_MIN
#endif
#endif /* __INCLUDE_NUTTX_FLOAT_H */
