bignum_add_si     694 src/bignum.c       return Scm_NormalizeBignum(bignum_add_si(bx, y));
bignum_add_si     699 src/bignum.c       return Scm_NormalizeBignum(bignum_add_si(bx, -y));
bignum_add_si     708 src/bignum.c               r = bignum_add_si(r, SCM_INT_VALUE(v));
bignum_add_si     731 src/bignum.c               r = bignum_add_si(r, -SCM_INT_VALUE(v));