Subversion Repositories openrisc_2011-10-31

extern void abort();

#define HOST_WIDE_INT long

#define HOST_BITS_PER_WIDE_INT (sizeof(long)*8)

struct tree_type

{

  unsigned int precision : 9;

};

int

sign_bit_p (struct tree_type *t, HOST_WIDE_INT val_hi, unsigned HOST_WIDE_INT val_lo)

{

  unsigned HOST_WIDE_INT mask_lo, lo;

  HOST_WIDE_INT mask_hi, hi;

  int width = t->precision;

  if (width > HOST_BITS_PER_WIDE_INT)

    {

      hi = (unsigned HOST_WIDE_INT) 1 << (width - HOST_BITS_PER_WIDE_INT - 1);

      lo = 0;

      mask_hi = ((unsigned HOST_WIDE_INT) -1

                 >> (2 * HOST_BITS_PER_WIDE_INT - width));

      mask_lo = -1;

    }

  else

    {

      hi = 0;

      lo = (unsigned HOST_WIDE_INT) 1 << (width - 1);

      mask_hi = 0;

      mask_lo = ((unsigned HOST_WIDE_INT) -1

                 >> (HOST_BITS_PER_WIDE_INT - width));

    }

  if ((val_hi & mask_hi) == hi

      && (val_lo & mask_lo) == lo)

    return 1;

  return 0;

}

int main()

{

  struct tree_type t;

  t.precision = 1;

  if (!sign_bit_p (&t, 0, -1))

    abort ();

  return 0;

}