1#include <float.h>
2#include <math.h>
3#include <stdint.h>
4
5#if FLT_EVAL_METHOD==0
6#define EPS FLT_EPSILON
7#elif FLT_EVAL_METHOD==1
8#define EPS DBL_EPSILON
9#elif FLT_EVAL_METHOD==2
10#define EPS LDBL_EPSILON
11#endif
12static const float_t toint = 1/EPS;
13
14float rintf(float x)
15{
16	union {float f; uint32_t i;} u = {x};
17	int e = u.i>>23 & 0xff;
18	int s = u.i>>31;
19	float_t y;
20
21	if (e >= 0x7f+23)
22		return x;
23	if (s)
24		y = x - toint + toint;
25	else
26		y = x + toint - toint;
27	if (y == 0)
28		return s ? -0.0f : 0.0f;
29	return y;
30}
31