1 #include <math.h> 2 #include <stdint.h> 3 4 int __fpclassifyf(float x) 5 { 6 union {float f; uint32_t i;} u = {x}; 7 int e = u.i>>23 & 0xff; 8 if (!e) return u.i<<1 ? FP_SUBNORMAL : FP_ZERO; 9 if (e==0xff) return u.i<<9 ? FP_NAN : FP_INFINITE; 10 return FP_NORMAL; 11 } 12