ff55f2af75
rustc_target: RISC-V: feature addition batch 2
Of ratified RISC-V extensions, this commit adds ones satisfying following criteria:
1. Either discoverable through a `riscv_hwprobe` system call on Linux 6.14
or should be very helpful even on basic needs (the `B` extension),
2. Does not disrupt current Rust's feature handling mechanism and
3. Not too OS-dependent (the `Supm` extension)
Due to 2., the author excluded `Zcf` (RV32 only) and `Zcd` from the list despite that they are discoverable from Linux 6.14.
Due to 3., the author excluded the `Supm` extension on the PR version 2.
This is based on the specification:
* [The latest ratified ISA Manuals (version 20240411)](https://lf-riscv.atlassian.net/wiki/spaces/HOME/pages/16154769/RISC-V+Technical+Specifications)
Linux Definition: https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/tree/arch/riscv/include/uapi/asm/hwprobe.h
LLVM Definitions:
* [`B`](https://github.com/llvm/llvm-project/blob/llvmorg-19.1.0/llvm/lib/Target/RISCV/RISCVFeatures.td#L507-L510)
* [`Zca`](https://github.com/llvm/llvm-project/blob/llvmorg-19.1.0/llvm/lib/Target/RISCV/RISCVFeatures.td#L395-L398)
* [`Zcb`](https://github.com/llvm/llvm-project/blob/llvmorg-19.1.0/llvm/lib/Target/RISCV/RISCVFeatures.td#L407-L410)
* [`Zcmop`](https://github.com/llvm/llvm-project/blob/llvmorg-19.1.0/llvm/lib/Target/RISCV/RISCVFeatures.td#L460-L463)
* [`Zfa`](https://github.com/llvm/llvm-project/blob/llvmorg-19.1.0/llvm/lib/Target/RISCV/RISCVFeatures.td#L335-L338)
* [`Zicboz`](https://github.com/llvm/llvm-project/blob/llvmorg-19.1.0/llvm/lib/Target/RISCV/RISCVFeatures.td#L89-L92)
* [`Zicond`](https://github.com/llvm/llvm-project/blob/llvmorg-19.1.0/llvm/lib/Target/RISCV/RISCVFeatures.td#L125-L128)
* [`Zihintntl`](https://github.com/llvm/llvm-project/blob/llvmorg-19.1.0/llvm/lib/Target/RISCV/RISCVFeatures.td#L148-L151)
* [`Zimop`](https://github.com/llvm/llvm-project/blob/llvmorg-19.1.0/llvm/lib/Target/RISCV/RISCVFeatures.td#L161-L162)
* [`Ztso`](https://github.com/llvm/llvm-project/blob/llvmorg-19.1.0/llvm/lib/Target/RISCV/RISCVFeatures.td#L214-L217)
The author also adds required implication: `C` implies `Zca`.
Android RISC-V target is also updated to include the `B` extension (this is just a shorthand combination of `Zba`, `Zbb` and `Zbs` extensions but possibly simplifies `target_feature` handling).
# History
## Version 1 → 2
* Remove the `Supm` extension from the Rust target features (thanks, `@Amanieu).`
--------
Related:
* #44839
(`riscv_target_feature`)
* #138823
(my previous batch)
* #132618
(stabilization of the `Zfa` extension is blocked by this)
`@rustbot` r? `@Amanieu`
`@rustbot` label +T-compiler +O-riscv +A-target-feature
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