cosmopolitan/libc/math/nearbyint.c

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2020-06-15 14:18:57 +00:00
#include "libc/math/fenv.h"
#include "libc/math/math.h"
/* nearbyint is the same as rint, but it must not raise the inexact exception */
double nearbyint(double x)
{
#ifdef FE_INEXACT
#pragma STDC FENV_ACCESS ON
int e;
e = fetestexcept(FE_INEXACT);
#endif
x = rint(x);
#ifdef FE_INEXACT
if (!e)
feclearexcept(FE_INEXACT);
#endif
return x;
}