__mpn_mul_1
p->frac[p->fracsize - 1] = __mpn_mul_1 (p->frac, p->frac,
_cy = __mpn_mul_1 (p->frac, p->frac, p->fracsize, 10);
cy = __mpn_mul_1 (p.tmp, p.frac, p.fracsize, 10);
cy = __mpn_mul_1 (n, n, *nsize, MAX_FAC_PER_LIMB);
cy = __mpn_mul_1 (n, n, *nsize, start);