/*
* Copyright (c) 2012 Adam Hraska
* All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
*
* - Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* - 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.
* - The name of the author may not be used to endorse or promote products
* derived from this software without specific prior written permission.
*
* THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``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 AUTHOR 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 IEEE_DOUBLE_H_
#define IEEE_DOUBLE_H_
#include <stdint.h>
#include <stdbool.h>
/** Represents a non-negative floating point number: significand * 2^exponent */
typedef struct fp_num_t_tag {
/** Significand (aka mantissa). */
uint64_t significand;
/** Binary exponent. */
int exponent;
} fp_num_t;
/** Double number description according to IEEE 754. */
typedef struct ieee_double_t_tag {
/** The number is a NaN or infinity. */
bool is_special;
/** Not a number. */
bool is_nan;
bool is_negative;
/** The number denoted infinity. */
bool is_infinity;
/** The number could not be represented as a normalized double. */
bool is_denormal;
/**
* The predecessor double is closer than the successor. This happens
* if a normal number is of the form 2^k and it is not the smallest
* normal number.
*/
bool is_accuracy_step;
/**
* If !is_special the double's value is:
* pos_val.significand * 2^pos_val.exponent
*/
fp_num_t pos_val;
} ieee_double_t;
extern ieee_double_t extract_ieee_double(double);
#endif