1#include "libm.h"
2
3#if FLT_EVAL_METHOD==0
4#define EPS FLT_EPSILON
5#elif FLT_EVAL_METHOD==1
6#define EPS DBL_EPSILON
7#elif FLT_EVAL_METHOD==2
8#define EPS LDBL_EPSILON
9#endif
10static const float_t toint = 1/EPS;
11
12float roundf(float x)
13{
14	union {float f; uint32_t i;} u = {x};
15	int e = u.i >> 23 & 0xff;
16	float_t y;
17
18	if (e >= 0x7f+23)
19		return x;
20	if (u.i >> 31)
21		x = -x;
22	if (e < 0x7f-1) {
23		FORCE_EVAL(x + toint);
24		return 0*u.f;
25	}
26	y = x + toint - toint - x;
27	if (y > 0.5f)
28		y = y + x - 1;
29	else if (y <= -0.5f)
30		y = y + x + 1;
31	else
32		y = y + x;
33	if (u.i >> 31)
34		y = -y;
35	return y;
36}
37