float.h

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#ifndef _MSL_COMMON_FLOAT_H
#define _MSL_COMMON_FLOAT_H
 
#include "fdlibm.h"
 
#define FP_SNAN 0
#define FP_QNAN 1
#define FP_INFINITE 2
#define FP_ZERO 3
#define FP_NORMAL 4
#define FP_SUBNORMAL 5
 
#define FP_NAN FP_QNAN
 
#define fpclassify(x) ((sizeof(x) == sizeof(float)) ? __fpclassifyf(x) : __fpclassifyd(x))
#define signbit(x) ((sizeof(x) == sizeof(float)) ? __signbitf(x) : __signbitd(x))
#define isfinite(x) ((fpclassify(x) > 2))
 
#define __signbitf(x) ((int)(__HI(x) & 0x80000000))
 
// TODO: OK?
#define __signbitd(x) ((int)(__HI(x) & 0x80000000))
 
extern unsigned long __float_nan[];
extern unsigned long __float_huge[];
extern unsigned long __float_max[];
extern unsigned long __float_epsilon[];
 
inline int __fpclassifyf(float __value) {
    unsigned long integer = *(unsigned long*)&__value;
 
    switch (integer & 0x7f800000) {
    case 0x7f800000:
        if ((integer & 0x7fffff) != 0) {
            return FP_QNAN;
        }
        return FP_INFINITE;
 
    case 0:
        if ((integer & 0x7fffff) != 0) {
            return FP_SUBNORMAL;
        }
        return FP_ZERO;
    }
 
    return FP_NORMAL;
}
 
inline int __fpclassifyd(double __value) {
    switch (__HI(__value) & 0x7ff00000) {
    case 0x7ff00000: {
        if ((__HI(__value) & 0x000fffff) || (__LO(__value) & 0xffffffff))
            return FP_QNAN;
        else
            return FP_INFINITE;
        break;
    }
    case 0: {
        if ((__HI(__value) & 0x000fffff) || (__LO(__value) & 0xffffffff))
            return FP_SUBNORMAL;
        else
            return FP_ZERO;
        break;
    }
    }
    return FP_NORMAL;
}
 
#define FLT_MANT_DIG   24
#define FLT_DIG        6
#define FLT_MIN_EXP    (-125)
#define FLT_MIN_10_EXP (-37)
#define FLT_MAX_EXP    128
#define FLT_MAX_10_EXP 38
 
#define FLT_MAX (*(float*) __float_max)
#define FLT_EPSILON (*(float*) __float_epsilon)
 
#define DBL_MANT_DIG   53
#define DBL_DIG        15
#define DBL_MIN_EXP    (-1021)
#define DBL_MIN_10_EXP (-308)
#define DBL_MAX_EXP    1024
#define DBL_MAX_10_EXP 308
 
#endif /* _MSL_COMMON_FLOAT_H */