Hi, The LangRef describes preserve_mostcc and preserve_allcc as experimental, to be used by a future version of the ObjectiveC runtime, possibly useful for other runtimes, and supported only on X86-64 but with the intention to support more architectures. AArch64 already has an implementation of preserve_mostcc. I'd be interested in using preserve_allcc on AArch64. I'm writing to ask: - Is anybody already working on that? - If not, and I implement it, should I expect that upstreaming it would meet with approval? (wanted to check that e.g. it's not slated for deprecation) - Any gotchas I should be aware of? Thanks, -Joseph -------------- next part -------------- An HTML attachment was scrubbed... URL: <http://lists.llvm.org/pipermail/llvm-dev/attachments/20180913/cb5a95aa/attachment.html>