mpn_perfpow: do we need a special GCD for mp_bitcnt_t?

[Niels Möller]

bodrato at mail.dm.unipi.it writes:

> Using mpn_remove does not solve a little issue, the mixed use of
> mp_bitcnt_t and mp_limb_t. When a prime factor is removed from the
> examined number, the exponent is returned as mp_bitcnt_t, the returned
> value is then casted to mp_limb_t, because we need the GCD of the
> exponents and mpn_gcd_1 wants limbs.

And when can there be a problem? If the mp_limb_t type is smaller than
mp_bitcnt_t? I guess that could happen if configuring with artificially
small limbs, but not otherwise?

Vagely related: We chould have an mpn_gcd_11 function, accepting two
limb-size arguments.

Regards,
/Niels

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