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compiler: Apply target features to the entry function

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WANG Rui
2025-09-03 11:34:15 +08:00
parent 033c0a4742
commit 923b892b67
2 changed files with 22 additions and 10 deletions
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22
compiler/rustc_codegen_llvm/src/attributes.rs
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@@ -296,6 +296,19 @@ pub(crate) fn tune_cpu_attr<'ll>(cx: &CodegenCx<'ll, '_>) -> Option<&'ll Attribu
.map(|tune_cpu| llvm::CreateAttrStringValue(cx.llcx, "tune-cpu", tune_cpu))
}
/// Get the `target-features` LLVM attribute.
pub(crate) fn target_features_attr<'ll>(
cx: &CodegenCx<'ll, '_>,
function_features: Vec<String>,
) -> Option<&'ll Attribute> {
let global_features = cx.tcx.global_backend_features(()).iter().map(String::as_str);
let function_features = function_features.iter().map(String::as_str);
let target_features =
global_features.chain(function_features).intersperse(",").collect::<String>();
(!target_features.is_empty())
.then(|| llvm::CreateAttrStringValue(cx.llcx, "target-features", &target_features))
}
/// Get the `NonLazyBind` LLVM attribute,
/// if the codegen options allow skipping the PLT.
pub(crate) fn non_lazy_bind_attr<'ll>(cx: &CodegenCx<'ll, '_>) -> Option<&'ll Attribute> {
@@ -523,14 +536,7 @@ pub(crate) fn llfn_attrs_from_instance<'ll, 'tcx>(
}
}
let global_features = cx.tcx.global_backend_features(()).iter().map(|s| s.as_str());
let function_features = function_features.iter().map(|s| s.as_str());
let target_features: String =
global_features.chain(function_features).intersperse(",").collect();
if !target_features.is_empty() {
to_add.push(llvm::CreateAttrStringValue(cx.llcx, "target-features", &target_features));
}
to_add.extend(target_features_attr(cx, function_features));
attributes::apply_to_llfn(llfn, Function, &to_add);
}