[fpc-devel] BBB / PRUS / M3 and fpc

Mark Morgan Lloyd markMLl.fpc-devel at telemetry.co.uk
Tue Dec 3 21:26:00 CET 2013

Michael Schnell wrote:
> On 12/03/2013 02:34 PM, Mark Morgan Lloyd wrote:
>>  and that the memory provision is fairly meager, it might be more 
>> trouble than it's worth.
> The Propeller is so short on closely coupled RAM that even to be able to 
> use a decent C compiler, someone implemented a "virtual CPU" interpreter 
> (i.e. "ZPU" architecture) to be run by the propeller core and create 
> code for this architecture by a gnu c compiler that is provided by same.
> So in fact it seems a lot more appropriate to port fpc to ZPU than to 
> the native propeller core.
> ZPU is a "zero register" 32 bit CPU architecture (it only has an up to 
> 32 bit PC and an up to 32 Bit SP - less with memory space below 4 GB). 
> Each instruction word is 8 bit wide. It is originally designed to be 
> implemented in an FPGA, bus it also is excellent suited as a target for 
> an interpreter.
> The ZPU architecture description and the C compiler can be obtained 
> here: http://opensource.zylin.com/zpu.htm
> Infos on ZPU, including the Propeller virtual machine can be found t´in 
> the mailing list zylin-zpu at zylin.com

Hmm. What with ZPU, LLVM, asm.js, Java bytecode, .NET CLI and no doubt 
others, what's needed is some universally-agreed meta-VM or at least a 
meta-representation. Tree-Meta, anybody?

Mark Morgan Lloyd
markMLl .AT. telemetry.co .DOT. uk

[Opinions above are the author's, not those of his employers or colleagues]

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