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iq2000.cpu's USES-* attributes


It seems a bit unfortunate that iq2000.cpu has USES-* attributes (e.g. USES-RD).
This kind of thing is supposed to be determined from the semantics.
[I mean, if you want to do it that way, ok, I guess, but why bother?]


Can anyone remember why it was done this way?

Also, what are these attributes used for?
[I couldn't find any use, but I didn't look that hard.]


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