bary_mul_karatsuba 1855 bignum.c           bary_mul_karatsuba(BDIGITS(z), zn, BDIGITS(x), xn, BDIGITS(y), yn, NULL, 0);
bary_mul_karatsuba 2450 bignum.c           bary_mul_karatsuba(zds, zn, xds, xn, yds, yn, wds, wn);