I've released version 0.91 of the RISC-V Bitmanip Spec a few days ago. https://github.com/riscv/riscv-bitmanip/blob/master/bitmanip-0.91.pdf … We added two new instructions, GORC and BFP, and changed the encodings of GREV and BMATXOR. The riscv-bitmanip branches of GNU tools and Spike already support the v0.91 bitmanip spec.
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... though is the proposal to have 9 different extensions for this serious??!?
Well, "B" is going to be a combination Zb exts. The individual Zb extensions are meant for implementations that only want some parts and not others. This also allows us to spec the individual Zb extensions first, then see what's most useful, then decide what to include in B.
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You hear that rhythmic thumping noise? That's the sound of a thousand software people beating their foreheads against their desks. Once the bruising subsides, they will arrive at the simple expedient of: "how about I don't use *any* of this stuff"?
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Intel at least has the excuse of history for their fragmented instruction sets, but this seems to be setting things up for fragmentation *from the start*.
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