RISC-V: Extension Updates (including document references) #2002
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The `Zb` extension does not exist and we instead have the `B` extension which is a superset of the three subextensions: `Zba`, `Zbb` and `Zbs`. For now (since `B` extension is not stabilized on Rust), this commit just removes `Zb`.
This is the latest ratified ISA Manual version and more importantly, some individual documents are merged into this. So, this commit consistently use this Manual (this version) where possible. Along with this, this commit substitutes link IDs from `rv-zb-*` to `rv-*` because `rv-zb-*` will look like the different document (bit-manipulation) is referenced.
rust-lang/rust#140139 changed the target feature implication without updating the Reference. That change is came from the fact that the Zbc extension is a functional superset of the Zbkc extension. This commit fixes this issue. Appendix - List of all Zbkc / Zbc instructions: * `clmul` (Zbkc / Zbc) * `clmulh` (Zbkc / Zbc) * `clmulr` (Zbc only)
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This PR updates documentation links and fixes minor issues:
zbis removed (bexists but not stabilized yet).zbkctarget feature is fixed.zbctarget feature is updated (reflects the behavior of rustc_target: Adjust RISC-V feature implication rust#140139).Note that this PR itself does not attempt to stabilize any of new extensions (target features) but makes the documentation more solid.