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Rollup merge of #120965 - ChrisDenton:sahf, r=michaelwoerister

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Add lahfsahf and prfchw target feature

This adds target features for LAHF/SAHF and PrefetchW. These came up. along with the existing CMPXCHG16b. as [baseline features](https://download.microsoft.com/download/c/1/5/c150e1ca-4a55-4a7e-94c5-bfc8c2e785c5/Windows%2010%20Minimum%20Hardware%20Requirements.pdf) required for x86_64 Windows 10+.
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Matthias Krüger 2024-02-12 23:18:54 +01:00 • committed by GitHub
commit 7075502b15
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8 changed files with 13 additions and 2 deletions
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compiler/rustc_codegen_ssa/src/target_features.rs
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@ -77,6 +77,8 @@ pub fn from_target_feature(
Some(sym::aarch64_ver_target_feature) => rust_features.aarch64_ver_target_feature,
Some(sym::csky_target_feature) => rust_features.csky_target_feature,
Some(sym::loongarch_target_feature) => rust_features.loongarch_target_feature,
Some(sym::lahfsahf_target_feature) => rust_features.lahfsahf_target_feature,
Some(sym::prfchw_target_feature) => rust_features.prfchw_target_feature,
Some(name) => bug!("unknown target feature gate {}", name),
None => true,
};