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only set noalias on Box with the global allocator

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This commit is contained in:
Ralf Jung 2024-03-05 11:32:03 +01:00
parent 5a1e5449c8
commit f391c0793b
17 changed files with 75 additions and 28 deletions
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2
compiler/rustc_ty_utils/src/abi.rs
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@ -452,7 +452,7 @@ fn adjust_for_rust_scalar<'tcx>(
let no_alias = match kind {
PointerKind::SharedRef { frozen } => frozen,
PointerKind::MutableRef { unpin } => unpin && noalias_mut_ref,
PointerKind::Box { unpin } => unpin && noalias_for_box,
PointerKind::Box { unpin, global } => unpin && global && noalias_for_box,
};
// We can never add `noalias` in return position; that LLVM attribute has some very surprising semantics
// (see <https://github.com/rust-lang/unsafe-code-guidelines/issues/385#issuecomment-1368055745>).