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document meaning of empty feature name in correct_fixed_length_vector_abi tables #161245

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rust-bors merged 1 commit into from
Aug 18, 2026
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document meaning of empty feature name in correct_fixed_length_vector_abi tables #161245

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3 changes: 2 additions & 1 deletion compiler/rustc_target/src/target_features.rs
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Original file line number Diff line number Diff line change
Expand Up @@ -1099,7 +1099,8 @@ pub fn feature_to_arch_names(feature: &str) -> Vec<&'static str> {
}

// These arrays represent the least-constraining feature that is required for vector types up to a
// certain size to have their "proper" ABI on each architecture.
// certain size to have their "proper" ABI on each architecture. An empty feature name means
// that the given length is unconditionally available.
// Note that they must be kept sorted by vector size.
const X86_FEATURES_FOR_CORRECT_FIXED_LENGTH_VECTOR_ABI: &'static [(u64, &'static str)] =
&[(128, "sse"), (256, "avx"), (512, "avx512f")]; // FIXME: might need changes for AVX10.
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