mpn_neg (was: Re: fast inversion)

[Niels Möller]

tg at gmplib.org writes:

>   Not sure why we're doing this as an inline function in gmp.h.
>   
> Me neither.  Perhaps as it is tiny?

I think inlines in gmp.h makes sense for functions which are tiny and
O(1) in the common case, like mpn_add_1 and mpn_cmp. Or small O(1)
wrappers around O(n) functions, like mpn_add. Any other criteria?

The current mpn_neg isn't of that type, but maybe it could be if it
defers the main work to mpn_com.

Regards,
/Niels

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