[LLVMdev] cmpxchg instruction with pointer operands

[Chuan Qiu]

cmpxchg only support exchange on int operands, but pointer values can be
very useful here, e.g. stack<T> in a linked-list, the top can be
atomic<Node<T>*>.
in clang++, cmpxchg operations on atomic<T*>  are bitcasted i64 and do the
operation, which is ugly.

Any reason or concern why cmpxchg doesn't support pointer operands?

Thanks
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