sameerds added a comment. Actually, the question really is about why inc/dec are needed as separate operations either as IR intrinsics or Clang builtins. Why not just expose a __builtin_amdgcn_atomicrmw that takes a scope, and map it to the LLVM atomicrmw? That would be way cleaner. The language can provide convenience functions for inc/dec that internally call the rmw builtin.
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