Function gmp_mpfr_sys::gmp::__gmpn_sub_n

pub unsafe extern fn __gmpn_sub_n(rp: *mut mp_limb_t,
                                  s1p: *const mp_limb_t,
                                  s2p: *const mp_limb_t,
                                  n: mp_size_t)
                                  -> mp_limb_t