aaron.ballman added a comment. It was explicitly disallowed in the initial patch: https://reviews.llvm.org/D12922 and the original author said "I'm still trying to figure out the best way to handle c++ virtual functions: this attribute is not very useful for someone who is looking for a way to reliably prevent tail-call to a virtual function." and "I made this change because this attribute isn't useful when the compiler cannot resolve the function call statically at compile time and it isn't important for the use case I have." Has this situation changed in the backend?
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