[Libre-soc-isa] [Bug 534] analysis of former variant of SVPrefix to fit onto OpenPOWER with little-to-no modification

[bugzilla-daemon at libre-soc.org]

https://bugs.libre-soc.org/show_bug.cgi?id=534

--- Comment #1 from Luke Kenneth Casson Leighton <lkcl at lkcl.net> ---
the preliminary analysis to fit on top of the forms created for RV show that
there is around a 90% match.  things that do not fit or need further analysis:

* st*x instructions (taking 3 read operands and stcix writing to CRs)
* CRio operations (mcrxr and cr* ops) which need de-grouping
* 1W-CRi (read CR, write INT/FP) which needs close inspection
* predication types (one using INTs, one using CRs)

also some operations i have marked as "R-Type" where they only have one
input reg and one output reg (R is actually 2R-1W), ideally a new Form
would be created for these.

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