will be, in hardware:
- 1R: reads one GPR/FPR/SPR/CR.
- 1W: writes one GPR/FPR/SPR/CR.
- - 1r: reads one CR *Field*.
- - 1w: writes one CR *Field*
+ - 1r: reads one CR *Field* (not necessarily the entire CR)
+ - 1w: writes one CR *Field* (not necessarily the entire CR)
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