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Diffstat (limited to 'nuttx/include/nuttx/float.h')
| -rw-r--r-- | nuttx/include/nuttx/float.h | 225 |
1 files changed, 225 insertions, 0 deletions
diff --git a/nuttx/include/nuttx/float.h b/nuttx/include/nuttx/float.h new file mode 100644 index 000000000..a8e4aa28b --- /dev/null +++ b/nuttx/include/nuttx/float.h @@ -0,0 +1,225 @@ +/**************************************************************************** + * 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 */ |