[Libre-soc-isa] [Bug 532] discuss iterative approach for statistical analysis of effectiveness of Compressed PowerISA encoding

[bugzilla-daemon at libre-soc.org]

https://bugs.libre-soc.org/show_bug.cgi?id=532

--- Comment #19 from Luke Kenneth Casson Leighton <lkcl at lkcl.net> ---
(In reply to Alexandre Oliva from comment #17)
> I had not noticed before writing the above, but the 16-bit immediate
> compressed encoding is very very similar, in function and possibilities, to
> the extend-next-insn mode I'd suggested before.

similar but see the comments and detailed explanation provided at the
Compressed bugreport (discussion to take place there, this is the
statistical analysis bugreport)

https://bugs.libre-soc.org/show_bug.cgi?id=238#c84

> I'm not sure I see why one is too CISC-ish while the other isn't (one vs 5/6
> bits to detect is probably a good hint ;-) but it seems to me it could very
> well be used to significantly extend the range of registers accessible in
> compressed mode, whether or not we go for 2-reg encoding in 16-bit insns,
> which is just what I'd hoped to accomplish with an extend-next opcode.

discussion of Compressed encodings under the Compressed bugreport, please,
this one is for statistical analysis methods.  once we've got some tools
and techniques i'll close it whilst the Compressed one will remain open.

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