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Matthias Krüger ff55f2af75
Rollup merge of #139440 - a4lg:riscv-feature-addition-batch-2, r=Amanieu 
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
2025-04-17 00:16:21 +02:00
..
assembly Auto merge of #136926 - wesleywiser:stabilize_dwarf-version, r=petrochenkov 2025-04-16 06:38:00 +00:00
auxiliary tests: use minicore more 2025-02-24 09:26:54 +00:00
codegen Rollup merge of #139718 - folkertdev:unsafe-attributes-earlier-editions, r=fmease 2025-04-13 23:57:40 -04:00
codegen-units Remove -Zinline-in-all-cgus and clean up CGU partitioning tests 2025-01-27 23:48:47 -05:00
coverage Update the minimum external LLVM to 19 2025-04-05 11:44:38 -07:00
coverage-run-rustdoc Update coverage-run-rustdoc output 2025-03-28 10:35:53 +01:00
crashes Normalize ADT fields in find_tails_for_unsizing 2025-04-14 16:51:00 +00:00
debuginfo replace //@ compile-flags: --edition with //@ edition 2025-04-10 09:56:37 +02:00
incremental UI tests: migrate remaining compile time error-patterns to line annotations 2025-04-13 21:48:53 +03:00
mir-opt Rollup merge of #139767 - compiler-errors:www, r=oli-obk 2025-04-14 18:15:32 +02:00
pretty Fix HIR pretty-printing of fns with just a variadic arg. 2025-04-15 10:41:10 +10:00
run-make Auto merge of #136926 - wesleywiser:stabilize_dwarf-version, r=petrochenkov 2025-04-16 06:38:00 +00:00
rustdoc replace //@ compile-flags: --edition with //@ edition 2025-04-10 09:56:37 +02:00
rustdoc-gui Add regression test for #139282 2025-04-07 17:28:46 +02:00
rustdoc-js rustdoc-search: add unbox flag to Result aliases 2025-04-11 11:36:40 -07:00
rustdoc-js-std rustdoc-search: add unbox flag to Result aliases 2025-04-11 11:36:40 -07:00
rustdoc-json rustdoc-json: Add test for #[automatically_derived] attribute 2025-03-31 20:42:49 +00:00
rustdoc-ui Auto merge of #138603 - xizheyin:issue-137405, r=chenyukang 2025-04-14 13:33:44 +00:00
ui Rollup merge of #139440 - a4lg:riscv-feature-addition-batch-2, r=Amanieu 2025-04-17 00:16:21 +02:00
ui-fulldeps Rollup merge of #139760 - petrochenkov:noerrpat2, r=jieyouxu 2025-04-13 23:57:41 -04:00
COMPILER_TESTS.md