Subversion Repositories openrisc

extern void abort (void);

static void fixnum_neg(signed char x, signed char *py, int *pv)

{

  unsigned char ux, uy;

  ux = (unsigned char)x;

  uy = -ux;

  *py = (uy <= 127) ? (signed char)uy : (-(signed char)(255 - uy) - 1);

  *pv = (x == -128) ? 1 : 0;

}

void __attribute__((noinline)) foo(int x, int y, int v)

{

  if (y < -128 || y > 127)

    abort();

}

int test_neg(void)

{

  signed char x, y;

  int v, err;

  err = 0;

  x = -128;

  for (;;) {

      fixnum_neg(x, &y, &v);

      foo((int)x, (int)y, v);

      if ((v && x != -128) || (!v && x == -128))

        ++err;

      if (x == 127)

        break;

      ++x;

  }

  return err;

}

int main(void)

{

  if (sizeof (char) != 1)

    return 0;

  if (test_neg() != 0)

    abort();

  return 0;

}