[virtmach] parrot VM?

[kyle]

There was a post here about a year ago that asked about the Parrot VM.  There 
wasn't a lot of response.  Parrot appears to be turning into a fairly "real" 
project now.  

There was a bit of Q&A posted about Parrot on the use Perl site and one of 
the questions was "register based?".  The response indicated that a 
register-based VM is more efficient than a stack-based VM even on x86 (at 
least that is how I read it).  The statement didn't make any real attempt to 
justify this.  This doesn't really sound right to me and since I'm stuck with 
x86 for the forseeable future, I'd like to know.

Is there any further info on the Parrot VM?  The details seem to be 
relatively sparse still.  Anyone have any more info?

Are there some other, documented VMs that use registers instead of a stack as 
the primary workspace?

Best,
Kyle