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@resistor @barrelshifter Either way, I like the way the funnel shift solution worked out. (And will always be grateful for Sanjay doing the legwork!)

They're a good normal form, funnel shift<->rotate (where applicable) is canonical and trivial in both directions, they can be formed early (which avoids destroying the pattern), they're reasonably common in target ISAs on their own right, and are still pretty straightforward to lower where they're not available