1#include "libm.h"
2
3float modff(float x, float *iptr)
4{
5	union {float f; uint32_t i;} u = {x};
6	uint32_t mask;
7	int e = (int)(u.i>>23 & 0xff) - 0x7f;
8
9	/* no fractional part */
10	if (e >= 23) {
11		*iptr = x;
12		if (e == 0x80 && u.i<<9 != 0) { /* nan */
13			return x;
14		}
15		u.i &= 0x80000000;
16		return u.f;
17	}
18	/* no integral part */
19	if (e < 0) {
20		u.i &= 0x80000000;
21		*iptr = u.f;
22		return x;
23	}
24
25	mask = 0x007fffff>>e;
26	if ((u.i & mask) == 0) {
27		*iptr = x;
28		u.i &= 0x80000000;
29		return u.f;
30	}
31	u.i &= ~mask;
32	*iptr = u.f;
33	return x - u.f;
34}
35