Re: Using the GNU GMP Library for Bignums in Emacs

[Paul Eggert]

Stefan Monnier wrote:
> I recently posted a patch which makes EQ behave like `eql` attached.
> I just tried to see its impact on the ELisp compilation time
> (i.e. I did `rm **/*.elc; make`).

I tried to reproduce this on my machine, and ran into some trouble (the code had 
warnings that caused compilation to fail). Although your patch is evidently 
intended only as a quick benchmark and not as an actual change, I worry that the 
benchmark isn't realistic enough, as some usage of EQ in C code will need to 
change to Feql or equivalent. Also, the C code will need to change how hashing 
works since XHASH etc. must be consistent with eq.

Looking into this a bit more, I discovered that eql currently operates 
incorrectly on NaNs, as it's inconsistent with how hash tables work. I installed 
the attached patch into master to fix that.

I'll try to look into doing a benchmark like yours with all the above in mind.

0001-Fix-bug-with-eql-etc.-on-NaNs.patch
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