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Justine Tunney 2020-06-15 07:18:57 -07:00
commit c91b3c5006
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29
libc/math/rintl.c Normal file
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#include "libc/math/libm.h"
#if LDBL_MANT_DIG == 53 && LDBL_MAX_EXP == 1024
long double rintl(long double x)
{
return rint(x);
}
#elif (LDBL_MANT_DIG == 64 || LDBL_MANT_DIG == 113) && LDBL_MAX_EXP == 16384
static const long double toint = 1/LDBL_EPSILON;
long double rintl(long double x)
{
union ldshape u = {x};
int e = u.i.se & 0x7fff;
int s = u.i.se >> 15;
long double y;
if (e >= 0x3fff+LDBL_MANT_DIG-1)
return x;
if (s)
y = x - toint + toint;
else
y = x + toint - toint;
if (y == 0)
return 0*x;
return y;
}
#endif