1#include <math.h>
2#include <stdint.h>
3
4double frexp(double x, int *e)
5{
6	union { double d; uint64_t i; } y = { x };
7	int ee = y.i>>52 & 0x7ff;
8
9	if (!ee) {
10		if (x) {
11			x = frexp(x*0x1p64, e);
12			*e -= 64;
13		} else *e = 0;
14		return x;
15	} else if (ee == 0x7ff) {
16		return x;
17	}
18
19	*e = ee - 0x3fe;
20	y.i &= 0x800fffffffffffffull;
21	y.i |= 0x3fe0000000000000ull;
22	return y.d;
23}
24