upscheme/c/ieee754.h

#ifndef __IEEE754_H_
#define __IEEE754_H_

union ieee754_float {
    float f;

    struct {
#if BYTE_ORDER == BIG_ENDIAN
        unsigned int negative : 1;
        unsigned int exponent : 8;
        unsigned int mantissa : 23;
#endif
#if BYTE_ORDER == LITTLE_ENDIAN
        unsigned int mantissa : 23;
        unsigned int exponent : 8;
        unsigned int negative : 1;
#endif
    } ieee;
};

#define IEEE754_FLOAT_BIAS 0x7f

union ieee754_double {
    double d;

    struct {
#if BYTE_ORDER == BIG_ENDIAN
        unsigned int negative : 1;
        unsigned int exponent : 11;
        unsigned int mantissa0 : 20;
        unsigned int mantissa1 : 32;
#endif
#if BYTE_ORDER == LITTLE_ENDIAN
        unsigned int mantissa1 : 32;
        unsigned int mantissa0 : 20;
        unsigned int exponent : 11;
        unsigned int negative : 1;
#endif
    } ieee;
};

#define IEEE754_DOUBLE_BIAS 0x3ff

union ieee854_long_double {
    long double d;

    struct {
#if BYTE_ORDER == BIG_ENDIAN
        unsigned int negative : 1;
        unsigned int exponent : 15;
        unsigned int empty : 16;
        unsigned int mantissa0 : 32;
        unsigned int mantissa1 : 32;
#endif
#if BYTE_ORDER == LITTLE_ENDIAN
        unsigned int mantissa1 : 32;
        unsigned int mantissa0 : 32;
        unsigned int exponent : 15;
        unsigned int negative : 1;
        unsigned int empty : 16;
#endif
    } ieee;
};

#define IEEE854_LONG_DOUBLE_BIAS 0x3fff

#endif