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#include <float.h> // for FLT_EPSILON, FLT_EVAL_METHOD
#include <math.h> // for float_t, rintf
#include <stdint.h> // for uint32_t
#if FLT_EVAL_METHOD == 0
#define EPS FLT_EPSILON
#elif FLT_EVAL_METHOD == 1
#define EPS DBL_EPSILON
#elif FLT_EVAL_METHOD == 2
#define EPS LDBL_EPSILON
#endif
static const float_t toint = 1 / EPS;
float rintf(float x)
{
union {
float f;
uint32_t i;
} u = { x };
int e = u.i >> 23 & 0xff;
int s = u.i >> 31;
float_t y;
if (e >= 0x7f + 23)
return x;
if (s)
y = x - toint + toint;
else
y = x + toint - toint;
if (y == 0)
return s ? -0.0f : 0.0f;
return y;
}
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