int _RoundNear = 0x133a;
int _RoundUp   = 0x1b3a;
int _RoundDown = 0x173a;

void near_()
{
  asm volatile ("fldcw _RoundNear");
}

void up_()
{
  asm volatile ("fldcw _RoundUp");
}

void down_()
{
  asm volatile ("fldcw _RoundDown");
}