vli_num_bits
num_bits = max(vli_num_bits(u1, ndigits), vli_num_bits(u2, ndigits));
unsigned int nbits = vli_num_bits(curve->n, ndigits);
EXPORT_SYMBOL(vli_num_bits);
int shift = (ndigits * 2 * 64) - vli_num_bits(mod, ndigits);
nbits = vli_num_bits(curve->n, curve->g.ndigits);
unsigned int vli_num_bits(const u64 *vli, unsigned int ndigits);