- x = mpmont_exp(&c->mm, x, ev->m, f);
- if (MP_CMP(x, ==, MP_ONE))
- goto done;
- if (c->n == 0) {
- mp_drop(ev->m);
- ev->m = MP_COPY(x);
- } else {
- size_t n = c->n - 1;
- f++;
+ if (!c->exp)
+ x = mp_copy(ev->m);
+ else {
+ x = mpmont_exp(&c->mm, MP_NEW, ev->m, c->exp);
+ if (MP_EQ(x, MP_ONE))
+ goto done;
+ }
+ if (c->n == 0)
+ goto ok;
+ else {
+ size_t n = c->n;
+ mp **f = c->f;
+ mp *y = MP_NEW;