udiv_qrnnd_preinv and udiv_rnnd_preinv macros

[Niels Möller]

Torbjorn Granlund <tg at gmplib.org> writes:

> So, remove CNST_LIMB if is uses safely.  Consider using a cast inside
> the function if needed.

I think it's safe. It's used as an argument to add_ssaaaa, and in the
expression (nl) - _qh * (d). In both cases, it ought to be promoted to
mp_limb_t.

Regards,
/Niels

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