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.