/**************************************************************************** * include/nuttx/float.h * * Copyright (C) 2012 Gregory Nutt. All rights reserved. * Author: Gregory Nutt * * 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 #include /**************************************************************************** * 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 */