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rustc_target: Adjust RISC-V feature implication (Za64rs and Za128rs)

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The Za64rs extension (reservation set -- a primitive memory unit of LR/SC
atomic operations -- is naturally aligned and *at most* 64 bytes) is a
superset of the Za128rs extension (*at most* 128 bytes; note that smaller
the reservation set is, more fine grained control over atomics).

This commit handles this as a feature implication.
This commit is contained in:
Tsukasa OI
2025-04-30 05:48:51 +00:00
parent b45dd71d18
commit adb92aeb4a
1 changed files with 1 additions and 1 deletions
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2
compiler/rustc_target/src/target_features.rs
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@@ -507,7 +507,7 @@ static RISCV_FEATURES: &[(&str, Stability, ImpliedFeatures)] = &[
("unaligned-vector-mem", Unstable(sym::riscv_target_feature), &[]),
("v", Unstable(sym::riscv_target_feature), &["zvl128b", "zve64d"]),
("za128rs", Unstable(sym::riscv_target_feature), &[]),
("za64rs", Unstable(sym::riscv_target_feature), &[]),
("za64rs", Unstable(sym::riscv_target_feature), &["za128rs"]), // Za64rs ⊃ Za128rs
("zaamo", Unstable(sym::riscv_target_feature), &[]),
("zabha", Unstable(sym::riscv_target_feature), &["zaamo"]),
("zacas", Unstable(sym::riscv_target_feature), &["zaamo"]),