#include "libm.h"

#if LDBL_MANT_DIG == 53 && LDBL_MAX_EXP == 1024
long double truncl(long double x) {
  return trunc(x);
}
#elif (LDBL_MANT_DIG == 64 || LDBL_MANT_DIG == 113) && LDBL_MAX_EXP == 16384

static const long double toint = 1 / LDBL_EPSILON;

long double truncl(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 (e <= 0x3fff - 1) {
    FORCE_EVAL(x + 0x1p120f);
    return x * 0;
  }
  /* y = int(|x|) - |x|, where int(|x|) is an integer neighbor of |x| */
  if (s)
    x = -x;
  y = x + toint - toint - x;
  if (y > 0)
    y -= 1;
  x += y;
  return s ? -x : x;
}
#endif