Emacs on 64-bit Windows platforms?

[John Dallman [311000]]

I'd like to get Emacs running on the two current 64-bit Windows platforms:
Itanium and AMD64. Both are supposed to be able to run x86 Windows
programs, but our old-faithful Emacs 19.34.6 (i386-*-nt4.0) exits silently
when run on them, without displaying any error messages or anything else.
In any case, performance will be better when they're running as native
code.

Has anyone done this before?

While I'm reasonably used to using Emacs, this will be my first attempt to
build or install it - or anything else with GNU autoconfig - and I'm not
sure
where to start, apart from downloading the tarball.

thanks,

John Dallman