Function antic::_nmod_poly_xgcd

pub unsafe extern "C" fn _nmod_poly_xgcd(
    G: mp_ptr, 
    S: mp_ptr, 
    T: mp_ptr, 
    A: mp_srcptr, 
    lenA: mp_limb_signed_t, 
    B: mp_srcptr, 
    lenB: mp_limb_signed_t, 
    mod_: nmod_t
) -> mp_limb_signed_t