mp_cmp_d
if (mp_cmp_d(pz, 1) == 0) {
if (mp_cmp_d(pz, 1) == 0) {
if (mp_cmp_d(pz, 1) == 0) {
if(mp_cmp_d(a, 1) <= 0)
if (mp_cmp_d(&f, 1) == MP_EQ) { /* f == 1 */
if (mp_cmp_d(&g, 1) != MP_EQ) {
int mp_cmp_d(const mp_int *a, mp_digit d);