[Cuis-dev] [Vm-dev] Cuis on a RISC

[Bruce O'Neel]

While it is true that RISC-V has a plethora of choices a sensible
target for COG would probably be called RV64GC, which is the base 64
bit plus useful things like the FPU and so on.  The critical letter
is that G which includes F and D the single and double precision float
instructions.

On 2022-06-15T19:22:06.000+02:00, tim Rowledge <tim at rowledge.org>
wrote:

> I could have sworn I've read emails from someone that did a MIPS cog port, but it hasn't made it to the 'official' opensmalltalk-vm repository as yet.
> 
> A complication for a RiscV cog that I would anticipate from my fairly limited reading on RiscV is that the actual instruction set for any particular cpu can vary quite a lot because of the building-block nature of the specification. I hope it's not quite as confusing as it seems to me so far.
> 
>>  On 2022-06-15, at 5:59 AM, ken.dickey at whidbey.com wrote:
>>  
>>  On 2022-06-15 03:06, Gerald Klix via Cuis-dev wrote:
>>  
>>>   Nevertheless I don't understand Ken's answer.
>>  
>>>   To make a story too long short: Obviously there never was a JIT
>>>   version of the
>>>   opensmalltalk VM for the RiscV-architecture (I don't know to
>>>   state this in a more explicit way).
>>  
>>  Gerald,
>>  
>>  Sorry to be confusing.
>>  
>>  OpenSmalltalk-VM has many delivery targets.
>>  OSs: Windows, Linux, MacOS, SunOS. [?RiscOS?]
> 
> Ah. RISC OS. Yes, well, I haven't had any time to update that in
> quite a while. I really would like to do a cog version since we have
> the ARM cog already sorted, but *time*. What even is that thing
> *spare time*?
> 
>>  CPU Architectures: Intel, Arm, now Risc-V
>>  32 bit, 64 bit variants
>>  Displays & plugins
>>  [X-Windows, FrameBuffer, ..]
>>  
>>  There are three basic VM "flavors"
>>  Original stack VM ["Back to the Future"]
>>  Spur [Stack VM with top of stack mapped to machine registers]
>>  a.k.s. squeak.stack.spur
>>  Cog [Above + JIT]
>>  a.k.a. squeak.cog.spur
>>  
>>  The VM easiest to port is squeak.stack.spur
>>  
>>  The squeak.stack.spur flavor is running now on RISC-V RV64 (64
>>  bit) Debian Linux.
>>  
>>  No JIT (no squeak,cog.spur) yet.
>>  
>>  HTH,
>>  -KenD
> 
> tim
> --
> tim Rowledge; tim at rowledge.org; http://www.rowledge.org/tim
> Strange OpCodes: SDP: Search and Destroy Pointer

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