/**************************************************************************** * include/nuttx/lib/float.h * * SPDX-License-Identifier: Apache-2.0 * * Licensed to the Apache Software Foundation (ASF) under one or more * contributor license agreements. See the NOTICE file distributed with * this work for additional information regarding copyright ownership. The * ASF licenses this file to you under the Apache License, Version 2.0 (the * "License"); you may not use this file except in compliance with the * License. You may obtain a copy of the License at * * http://www.apache.org/licenses/LICENSE-2.0 * * Unless required by applicable law or agreed to in writing, software * distributed under the License is distributed on an "AS IS" BASIS, WITHOUT * WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the * License for the specific language governing permissions and limitations * under the License. * ****************************************************************************/ #ifndef __INCLUDE_NUTTX_LIB_FLOAT_H #define __INCLUDE_NUTTX_LIB_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 /* Addition rounds to 0: zero, 1: nearest, 2: +inf, 3: -inf, -1: unknown. */ #ifndef FLT_ROUNDS /* May be defined in a toolchain header */ # define FLT_ROUNDS 1 #endif /* Number of base-FLT_RADIX digits in the floating-point significand, p. */ #ifndef FLT_MANT_DIG /* May be defined in a toolchain header */ # define FLT_MANT_DIG 24 #endif #ifndef DBL_MANT_DIG /* May be defined in a toolchain header */ # ifdef CONFIG_HAVE_DOUBLE # define DBL_MANT_DIG 53 # else # define DBL_MANT_DIG FLT_MANT_DIG # endif #endif #ifndef LDBL_MANT_DIG /* May be defined in a toolchain header */ # ifdef CONFIG_HAVE_LONG_DOUBLE # define LDBL_MANT_DIG DBL_MANT_DIG /* FIX ME */ # else # define LDBL_MANT_DIG DBL_MANT_DIG # endif #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. */ #ifndef FLT_DIG /* May be defined in a toolchain header */ # define FLT_DIG 6 #endif #ifndef DBL_DIG /* May be defined in a toolchain header */ # ifdef CONFIG_HAVE_DOUBLE # define DBL_DIG 15 /* 10 */ # else # define DBL_DIG FLT_DIG # endif #endif #ifndef LDBL_DIG /* May be defined in a toolchain header */ # ifdef CONFIG_HAVE_LONG_DOUBLE # define LDBL_DIG DBL_DIG /* FIX ME */ # else # define LDBL_DIG DBL_DIG # endif #endif /* Minimum negative integer such that FLT_RADIX raised to that power minus * 1 is a normalized floating-point number, emin. */ #ifndef FLT_MIN_EXP /* May be defined in a toolchain header */ # define FLT_MIN_EXP (-125) #endif #ifndef DBL_MIN_EXP /* May be defined in a toolchain header */ # ifdef CONFIG_HAVE_DOUBLE # define DBL_MIN_EXP (-1021) # else # define DBL_MIN_EXP FLT_MIN_EXP # endif #endif #ifndef LDBL_MIN_EXP /* May be defined in a toolchain header */ # ifdef CONFIG_HAVE_LONG_DOUBLE # define LDBL_MIN_EXP DBL_MIN_EXP /* FIX ME */ # else # define LDBL_MIN_EXP DBL_MIN_EXP # endif #endif /* Minimum negative integer such that 10 raised to that power is in the range * of normalized floating-point numbers. */ #ifndef FLT_MIN_10_EXP /* May be defined in a toolchain header */ # define FLT_MIN_10_EXP (-37) #endif #ifndef DBL_MIN_10_EXP /* May be defined in a toolchain header */ # ifdef CONFIG_HAVE_DOUBLE # define DBL_MIN_10_EXP (-307) /* -37 */ # else # define DBL_MIN_10_EXP FLT_MIN_10_EXP # endif #endif #ifndef LDBL_MIN_10_EXP /* May be defined in a toolchain header */ # 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 #endif /* Maximum integer such that FLT_RADIX raised to that power minus 1 is a * representable finite floating-point number, emax. */ #ifndef FLT_MAX_EXP /* May be defined in a toolchain header */ # define FLT_MAX_EXP 128 #endif #ifndef DBL_MAX_EXP /* May be defined in a toolchain header */ # ifdef CONFIG_HAVE_DOUBLE # define DBL_MAX_EXP 1024 # else # define DBL_MAX_EXP FLT_MAX_EXP # endif #endif #ifndef LDBL_MAX_EXP /* May be defined in a toolchain header */ # ifdef CONFIG_HAVE_LONG_DOUBLE # define LDBL_MAX_EXP DBL_MAX_EXP /* FIX ME */ # else # define LDBL_MAX_EXP DBL_MAX_EXP # endif #endif /* Maximum integer such that 10 raised to that power is in the range of * representable finite floating-point numbers. */ #ifndef FLT_MAX_10_EXP /* May be defined in toolchain header */ # define FLT_MAX_10_EXP 38 /* 37 */ #endif #ifndef DBL_MAX_10_EXP /* May be defined in toolchain header */ # ifdef CONFIG_HAVE_DOUBLE # define DBL_MAX_10_EXP 308 /* 37 */ # else # define DBL_MAX_10_EXP FLT_MAX_10_EXP # endif #endif #ifndef LDBL_MAX_10_EXP /* May be defined in toolchain header */ # 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 #endif /* Maximum representable finite floating-point number. */ #ifndef FLT_MAX /* May be defined in toolchain header */ # define FLT_MAX 3.40282347e+38F /* 1E+37 */ #endif #ifndef DBL_MAX /* May be defined in toolchain header */ # ifdef CONFIG_HAVE_DOUBLE # define DBL_MAX 1.7976931348623157e+308 /* 1E+37 */ # else # define DBL_MAX FLT_MAX # endif #endif #ifndef LDBL_MAX /* May be defined in toolchain header */ # ifdef CONFIG_HAVE_LONG_DOUBLE # define LDBL_MAX DBL_MAX /* FIX ME */ # else # define LDBL_MAX DBL_MAX # endif #endif /* The difference between 1 and the least value greater than 1 that is * representable in the given floating-point type, b1-p. */ #ifndef FLT_EPSILON /* May be defined in toolchain header */ # define FLT_EPSILON 1.1920929e-07F /* 1E-5 */ #endif #ifndef DBL_EPSILON /* May be defined in toolchain header */ # ifdef CONFIG_HAVE_DOUBLE # define DBL_EPSILON 2.2204460492503131e-16 /* 1E-9 */ # else # define DBL_EPSILON FLT_EPSILON # endif #endif #ifndef LDBL_EPSILON /* May be defined in toolchain header */ # ifdef CONFIG_HAVE_LONG_DOUBLE # define LDBL_EPSILON DBL_EPSILON /* FIX ME */ # else # define LDBL_EPSILON DBL_EPSILON # endif #endif /* Minimum normalized positive floating-point number, bemin -1. */ #ifndef FLT_MIN /* May be defined in toolchain header */ # define FLT_MIN 1.17549435e-38F /* 1E-37 */ #endif #ifndef DBL_MIN /* May be defined in toolchain header */ # ifdef CONFIG_HAVE_DOUBLE # define DBL_MIN 2.2250738585072014e-308 /* 1E-37 */ # else # define DBL_MIN FLT_MIN # endif #endif #ifndef LDBL_MIN /* May be defined in toolchain header */ # ifdef CONFIG_HAVE_LONG_DOUBLE # define LDBL_MIN DBL_MIN /* FIX ME */ # else # define LDBL_MIN DBL_MIN # endif #endif #endif /* __INCLUDE_NUTTX_LIB_FLOAT_H */