Bit flip only function?

[Viktor Kletzhändler]

Hi

The mpz_ logical and bit manipulation functions all seem to work on two's complement representations (as indicated in the manual). This is also true for the respective mpn_ functions, as far as I can see.

Is there an efficient "bit flip only" function (equivalent to the ~ operator)?

If not, is the attached code safe? It seems to work, and will run solely on 64-bit platforms. 

Thanks for advise
--vk

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