Re: Using the GNU GMP Library for Bignums in Emacs

[Richard Stallman]

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I don't think people want (format "%x" (lognot 257)) to output "-102".
Not on any platform.  It isn't what code expects, and it isn't useful.

Perhaps, with bignums,  lognot  should take a width operand, measured in bits.
So (lognot 257 32) would produce 0xfffffefe (a positive number)
and (lognot 257 64) would produce 0xfffffffffffffefe (a positive number).

Another idea: %Nx with a negative number should output its 2's
complement representation in 4N bits.

-- 
Dr Richard Stallman
President, Free Software Foundation (https://gnu.org, https://fsf.org)
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