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First of all: yes I think it makes sense to have a nop instruction that can be used without operands. I don't like the implementation though, to check for particular opcodes with a strcmp feels wrong.
My counter proposal would be to introduce new variantes for the RR_0R and RX_0RRD instruction formats. Make all operands optional and replace the strcmp check with a check against S390_OPERAND_OPTIONAL.
Cheers Nick
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