mirror of
https://github.com/rust-lang/rust.git
synced 2025-10-05 11:47:13 +00:00
ed11a39643
Certain LLVM intrinsics, such as `llvm.wasm.throw`, can unwind. Marking them as nounwind causes us to skip cleanup of locals and optimize out `catch_unwind` under inlining or when `llvm.wasm.throw` is used directly by user code. The motivation for forcibly marking llvm.* as nounwind is no longer present: most intrinsics are linked as `extern "C"` or other non-unwinding ABIs, so we won't codegen `invoke` for them anyway.
Please read the rustc-dev-guide chapter on Backend Agnostic Codegen.