I'm working on eliminating as many occurances of THE_ISA == X as is reasonable, and one place it comes up is figuring out whether or not to zero the floating point zero register. I think we discussed this before, but would it make more sense for the register file to maintain that semantic by always returning 0 or ignoring writes to the zero register? We couldn't do that directly since o3 doesn't use the ISA defined register files, but we could for the simple CPUs.
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