1#include "libm.h"
2
3float nextafterf(float x, float y)
4{
5	union {float f; uint32_t i;} ux={x}, uy={y};
6	uint32_t ax, ay, e;
7
8	if (isnan(x) || isnan(y))
9		return x + y;
10	if (ux.i == uy.i)
11		return y;
12	ax = ux.i & 0x7fffffff;
13	ay = uy.i & 0x7fffffff;
14	if (ax == 0) {
15		if (ay == 0)
16			return y;
17		ux.i = (uy.i & 0x80000000) | 1;
18	} else if (ax > ay || ((ux.i ^ uy.i) & 0x80000000))
19		ux.i--;
20	else
21		ux.i++;
22	e = ux.i & 0x7f800000;
23	/* raise overflow if ux.f is infinite and x is finite */
24	if (e == 0x7f800000)
25		FORCE_EVAL(x+x);
26	/* raise underflow if ux.f is subnormal or zero */
27	if (e == 0)
28		FORCE_EVAL(x*x + ux.f*ux.f);
29	return ux.f;
30}
31