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      1 #include <math.h>
      2 #include <stdint.h>
      3 
      4 float frexpf(float x, int *e)
      5 {
      6 	union { float f; uint32_t i; } y = { x };
      7 	int ee = y.i>>23 & 0xff;
      8 
      9 	if (!ee) {
     10 		if (x) {
     11 			x = frexpf(x*0x1p64, e);
     12 			*e -= 64;
     13 		} else *e = 0;
     14 		return x;
     15 	} else if (ee == 0xff) {
     16 		return x;
     17 	}
     18 
     19 	*e = ee - 0x7e;
     20 	y.i &= 0x807ffffful;
     21 	y.i |= 0x3f000000ul;
     22 	return y.f;
     23 }
     24