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| | #include "libm.h"
#ifdef LONG_DOUBLE_IS_BINARY64
long double ceill(long double x)
{
return ceil(x);
}
#elif defined(LONG_DOUBLE_IS_X87_EXTENDED) || defined(LONG_DOUBLE_IS_BINARY128)
static const long double toint = 1/LDBL_EPSILON;
long double ceill(long double x)
{
union ldshape u = {x};
int e = u.i.se & 0x7fff;
long double y;
if (e >= 0x3fff+LDBL_MANT_DIG-1 || x == 0)
return x;
/* y = int(x) - x, where int(x) is an integer neighbor of x */
if (u.i.se >> 15)
y = x - toint + toint - x;
else
y = x + toint - toint - x;
/* special case because of non-nearest rounding modes */
if (e <= 0x3fff-1) {
FORCE_EVAL(y);
return u.i.se >> 15 ? -0.0 : 1;
}
if (y < 0)
return x + y + 1;
return x + y;
}
#endif
|