rust/library/std_detect/src at 316a79f4320bbdfd7fd1eead13ea45f71bc66d5b - user0/rust

user0/rust

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Tsukasa OI 316a79f432 Stabilize 29 RISC-V target features (`riscv_ratified_v2`) This commit stabilizes RISC-V target features with following constraints: * Describes a ratified extension. * Implemented on Rust 1.88.0 or before. Waiting for four+ version cycles seems sufficient. * Does not disrupt current rustc's target feature + ABI handling. It excludes "E" and all floating point-arithmetic extensions. "Zfinx" family does not involve floating point registers but not stabilizing for now to avoid possible confusion between the "F" extension family. * Not vector-related (floating point and integer). While integer vector subsets should not cause any ABI issues (as they don't use ABI-dependent floating point registers), we need to discuss before stabilizing them. * Supported by the lowest LLVM version supported by rustc (LLVM 20). List of target features to be stabilized: 1. "b" 2. "za64rs" (no-RT) 3. "za128rs" (no-RT) 4. "zaamo" 5. "zabha" 6. "zacas" 7. "zalrsc" 8. "zama16b" (no-RT) 9. "zawrs" 10. "zca" 11. "zcb" 12. "zcmop" 13. "zic64b" (no-RT) 14. "zicbom" 15. "zicbop" (no-RT) 16. "zicboz" 17. "ziccamoa" (no-RT) 18. "ziccif" (no-RT) 19. "zicclsm" (no-RT) 20. "ziccrse" (no-RT) 21. "zicntr" 22. "zicond" 23. "zicsr" 24. "zifencei" 25. "zihintntl" 26. "zihintpause" 27. "zihpm" 28. "zimop" 29. "ztso" Of which, 20 of them (29 minus 9 "no-RT" target features) support runtime detection through `std::arch::is_riscv_feature_detected!()`.	2025-09-17 10:54:02 +00:00
..
detect	Stabilize 29 RISC-V target features (`riscv_ratified_v2`)	2025-09-17 10:54:02 +00:00
lib.rs	library: Migrate from `cfg_if` to `cfg_select`	2025-08-16 05:28:31 -07:00

Tsukasa OI 316a79f432 Stabilize 29 RISC-V target features (riscv_ratified_v2)

This commit stabilizes RISC-V target features with following constraints:

*   Describes a ratified extension.
*   Implemented on Rust 1.88.0 or before.
    Waiting for four+ version cycles seems sufficient.
*   Does not disrupt current rustc's target feature + ABI handling.
    It excludes "E" and all floating point-arithmetic extensions.
    "Zfinx" family does not involve floating point registers but
    not stabilizing for now to avoid possible confusion between
    the "F" extension family.
*   Not vector-related (floating point and integer).
    While integer vector subsets should not cause any ABI issues
    (as they don't use ABI-dependent floating point registers),
    we need to discuss before stabilizing them.
*   Supported by the lowest LLVM version supported by rustc (LLVM 20).

List of target features to be stabilized:

1.  "b"
2.  "za64rs"   (no-RT)
3.  "za128rs"  (no-RT)
4.  "zaamo"
5.  "zabha"
6.  "zacas"
7.  "zalrsc"
8.  "zama16b"  (no-RT)
9.  "zawrs"
10. "zca"
11. "zcb"
12. "zcmop"
13. "zic64b"   (no-RT)
14. "zicbom"
15. "zicbop"   (no-RT)
16. "zicboz"
17. "ziccamoa" (no-RT)
18. "ziccif"   (no-RT)
19. "zicclsm"  (no-RT)
20. "ziccrse"  (no-RT)
21. "zicntr"
22. "zicond"
23. "zicsr"
24. "zifencei"
25. "zihintntl"
26. "zihintpause"
27. "zihpm"
28. "zimop"
29. "ztso"

Of which, 20 of them (29 minus 9 "no-RT" target features) support
runtime detection through `std::arch::is_riscv_feature_detected!()`.

2025-09-17 10:54:02 +00:00

detect Stabilize 29 RISC-V target features (riscv_ratified_v2) 2025-09-17 10:54:02 +00:00

lib.rs library: Migrate from cfg_if to cfg_select 2025-08-16 05:28:31 -07:00