llvm-gcc-4.2/gcc/testsuite/gcc.c-torture/execute/20040208-2.c

int main ()
{
  long double x, y;

  x = 0x1.fffffffffffff8p1022L;
  x *= 2;
  y = 0x1.fffffffffffff8p1023L;
  if (memcmp (&x, &y, sizeof (x)) != 0)
    abort ();
  exit (0);
}