tp/include/MSL_C/MSL_Common/Src/float.h

65 lines
1.4 KiB
C

#ifndef MSL_COMMON_SRC_FLOAT_H
#define MSL_COMMON_SRC_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) ((*(unsigned char*)&(x)) & 0x80)
// TODO: OK?
#define __signbitd(x) ((*(unsigned char*)&(x)) & 0x80)
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;
}
#endif /* MSL_COMMON_SRC_FLOAT_H */