s_mp_lshd
mp_err s_mp_lshd(mp_int *mp, mp_size p); /* left-shift by p digits */
s_mp_lshd(&mu, 2 * USED(m));
if (dshift && MP_OKAY != (res = s_mp_lshd(mp, dshift)))
s_mp_lshd(", 1);
MP_CHECKOK( s_mp_lshd(", 1) );
if((res = s_mp_lshd(&q, USED(m) + 1)) != MP_OKAY)
if((res = s_mp_lshd(mp, 1)) != MP_OKAY)