Re: bignum branch

[Andy Moreton]

On Fri 13 Jul 2018, Andy Moreton wrote:

> On Thu 12 Jul 2018, Tom Tromey wrote:
>
>> I've pushed the bignum branch to emacs git, as feature/bignum.
>>
>> Please read through it and try it out, and reply to this message with
>> your comments.
>>
>> thanks,
>> Tom
>
> I've bootstrapped this with 64bit mingw64 (MSYS2) on Windows without
> problems. There were a few compile warnings:
>
> C:/emacs/git/emacs/bignum/src/floatfns.c: In function 'Fabs':
> C:/emacs/git/emacs/bignum/src/floatfns.c:291:29: warning: overflow in 
> implicit constant conversion [-Woverflow]
>        mpz_init_set_si (val, - MOST_NEGATIVE_FIXNUM);

There is also odd behaviour on the bignum branch:
ELISP> most-negative-fixnum
-2305843009213693952 (#o200000000000000000000, #x2000000000000000)
ELISP> (abs most-negative-fixnum)
0 (#o0, #x0, ?\C-@)

On master, this behaves as expected:
ELISP> most-negative-fixnum
-2305843009213693952 (#o200000000000000000000, #x2000000000000000)
ELISP> (abs most-negative-fixnum)
-2305843009213693952 (#o200000000000000000000, #x2000000000000000)