Very interesting. I could not imagine to have some advantage of banks and
lack of a stack until I read this. You know, we old, breeded with Intel, and
Z80 machines have a little tough thinking :-)

Igor

-----Original Message-----
From: pic microcontroller discussion list [mailto:PICLIST@MITVMA.MIT.EDU]On
Behalf Of James Caska
Sent: Tuesday, May 20, 2003 2:13 AM
To: PICLIST@MITVMA.MIT.EDU
Subject: Re: [PIC]: buy.microchip.com, any thoughts ?


Hi,

Glad you asked. Healthy sceptism is a trademark of quality engineers. To
give a little backgrounder, I have been building muvium for 3 years
based on software I built for virtual breadboard
(www.virtualbreadboard.com) for the 3 years before then so muvium is
about 6 years in the making.. So to speak.. Why is the pic useful for
java..?

Well,.. The banking allows static frames featuring frame caching,
instant context switching, and supurb keyhole optimisations over known
slot locations almost eliminating the stack operators in most cases.
Would be tough to do as efficiently in a load/store architecture..

Ok.. so maybe I did give away a few secrets ;-)

Interesting isn't it. What criples the PIC for C backends like gcc makes
it a champion for java.. Makes sense though.. A weakness in one thing is
often a strength in another. Who would have known that the PIC's
strength would be java..

Muvium executes java in most cases as fast (and sometimes faster) than
equivalent 'C' code and makes the performance of many interpretive java
virtual machines look just a bit silly and yet there are still many more
optimisations and devices to come..

Come see a demo and have a chat at PICMASTERS :-)

Cheers,

James Caska
www.muvium.com
uVM - 'Java Bred for Embedded'



-----Original Message-----
From: pic microcontroller discussion list
[mailto:PICLIST@MITVMA.MIT.EDU] On Behalf Of William Chops Westfield
Sent: Monday, 19 May 2003 11:42 PM
To: PICLIST@MITVMA.MIT.EDU
Subject: Re: [PIC]: buy.microchip.com, any thoughts ?


    Just a little thing thing.. The PIC's screwy architecture just so
    happens to give a massive advantage in compiler design for executing
the
    frame based Java Virtual Machine which gives it at least a 5 fold
    advantage for Object Orientated Processing over register/load/store
    architectures..

I find that difficult to believe.  Can you explain this in more detail
without giving away secrets?

BillW

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