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rustc_codegen_llvm: Filter out unavailable LLVM features

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Convert to_llvm_features to return Option<LLVMFeature> so that it can
return None if the requested feature is not available for the current
LLVM version.

Add match rules to filter out aarch64 features not available in LLVM 17.
This commit is contained in:
Kajetan Puchalski
2024-08-09 16:41:43 +01:00
parent 4fc4019cbc
commit 3a0fbb5d4e
2 changed files with 63 additions and 38 deletions
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7
compiler/rustc_codegen_llvm/src/attributes.rs
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@@ -521,9 +521,10 @@ pub(crate) fn llfn_attrs_from_instance<'ll, 'tcx>(
let function_features = function_features
.iter()
.flat_map(|feat| {
llvm_util::to_llvm_features(cx.tcx.sess, feat).into_iter().map(|f| format!("+{f}"))
})
// Convert to LLVMFeatures and filter out unavailable ones
.flat_map(|feat| llvm_util::to_llvm_features(cx.tcx.sess, feat))
// Convert LLVMFeatures & dependencies to +<feats>s
.flat_map(|feat| feat.into_iter().map(|f| format!("+{f}")))
.chain(codegen_fn_attrs.instruction_set.iter().map(|x| match x {
InstructionSetAttr::ArmA32 => "-thumb-mode".to_string(),
InstructionSetAttr::ArmT32 => "+thumb-mode".to_string(),