+#include <float.h>
#include <math.h>
#include <stdint.h>
+#if FLT_EVAL_METHOD==0 || FLT_EVAL_METHOD==1
+#define EPS DBL_EPSILON
+#elif FLT_EVAL_METHOD==2
+#define EPS LDBL_EPSILON
+#endif
+static const double_t toint = 1/EPS;
+
double rint(double x)
{
union {double f; uint64_t i;} u = {x};
if (e >= 0x3ff+52)
return x;
if (s)
- y = (double)(x - 0x1p52) + 0x1p52;
+ y = x - toint + toint;
else
- y = (double)(x + 0x1p52) - 0x1p52;
+ y = x + toint - toint;
if (y == 0)
return s ? -0.0 : 0;
return y;