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In case you haven't checked in on the RISC-V Bitmanipulation ISA extension in a while: We are making steady progress! 
Check out the current draft spec:
https://raw.githubusercontent.com/riscv/riscv-bitmanip/master/bitmanip-draft.pdf …
https://github.com/riscv/riscv-bitmanip/blob/master/bitmanip-draft.pdf …pic.twitter.com/7CahAirRVy
I'm always looking for feedback and comments. If you can't join the RISC-V Foundation Bitmanipulation Task Group and mailing list, just reply here or send your feedback as github issue: https://github.com/riscv/riscv-bitmanip/issues/new ….
Probably a bit obscure, but when working on your bit permutation question, I wanted to treat an array of integers as a 2D bit array, and interpret a column as an int.
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