Re: 64 bit official Windows builds

[Eli Zaretskii <eliz@gnu.org>]

> From: Óscar Fuentes <ofv@wanadoo.es>
> Date: Mon, 08 Feb 2016 19:29:29 +0100
> 
> Eli Zaretskii <eliz@gnu.org> writes:
> 
> > Third, when Emacs is built with a 64-bit compiler, it runs faster, not
> > slower, because running a 32-bit executable on a 64-bit Windows
> > requires expensive thunking for every call to any Windows API,
> > something that happens a lot.
> 
> For a pointer-chasing program like Emacs, data cache effects are orders
> of magnitude more expensive than thunking. That's what I observe with
> similar applications. As for Emacs, I see no performance difference
> among 32 bit and 64 bit executables, for ordinary use. That's how it
> should be: a good interactive application is never supposed to make the
> user wait, and Emacs does a decent job at that.

Try some CPU intensive processing, or a command that does a lot of
disk I/O.

A program such as GNU Find runs more than twice faster when compiled
as a 64-bit application.