text: #ifndef LMP_ADD_MNC
  inline lmp_limb_t lmp_add_mnc(
            lmp_limb_t *restrict rp,
      const lmp_limb_t *restrict ap, size_t an,
      const lmp_limb_t *restrict bp, size_t bn, lmp_limb_t c)
  {
      ASSERT(an > 0);
      ASSERT(bn > 0);
      ASSERT(an >= bn);
      ASSERT(c <= 1);
  
      lmp_limb_t co = lmp_add_mmc(rp, ap, bp, bn, c);
      return lmp_add_mc(&rp[bn], &ap[bn], an - bn, co);
  }
  #endif
  