phongn commented on issue #13555:
URL: 
https://github.com/apache/trafficserver/issues/13555#issuecomment-5345113123

   Technically, the fallback x86-64 path assumes LA48 and does not support LA57 
mode. Fortunately, anything with LA57 has `cmpxchg16b` so we never see that 
path; it might be worth a comment in `ink_queue.h`. 
   
   I'm wondering if we should have a dedicated `libatomic` fallback path 
preferred immediately after the `TS_HAS_128BIT_CAS` path? 


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