Re: Compiling Elisp to a native code with a GCC plugin

[Eli Zaretskii]

> From: Lars Magne Ingebrigtsen <address@hidden>
> Date: Fri, 17 Sep 2010 17:16:25 +0200
> 
> Andreas Schwab <address@hidden> writes:
> 
> >>>> Don't the Lisp integers use a bit for the type tag?
> >>>
> >>> most-positive-fixnum is a variable defined in `data.c'.
> >>> Its value is 2305843009213693951
> >>
> >> And by that you mean "yes" or "no"?
> >>
> >> (format "%x" most-positive-fixnum)
> >> => "1fffffffffffffff"
> >>
> >> That's at least a few bits less than MAX_INT, isn't it?
> >
> > $ printf '#include <limits.h>\nINT_MAX\n' | gcc -E -xc - | tail -n1
> > 2147483647
> 
> You're being rather gnomic.

Psst, Lars: it's pointless to ask Andreas for human-readable
explanations.  You won't get them.  He enjoys to get you puzzled.

The issue here is that EMACS_INT can be a 64-bit type (on a 64-bit
host), but MAX_INT is always the maximum possible value of a 32-bit
int, even on a 64-bit machine.