gcc/testsuite/gcc.c-torture/execute/930622-2.c

void abort (void);
void exit (int);

long double
ll_to_ld (long long n)
{
  return n;
}

long long
ld_to_ll (long double n)
{
  return n;
}

int
main (void)
{
  long long n;

  if (ll_to_ld (10LL) != 10.0)
    abort ();

  if (ld_to_ll (10.0) != 10)
    abort ();

  exit (0);
}