azabaznov added a comment.

You also need to guard //memory_order_seq_cst// enum entry. Note that 
//memory_order_acq_rel// is always defined as it can be used in 
//atomic_work_item_fence()// built-in function, AFAIR in all other cases if 
//memory_order_acq_rel// is used without //__opencl_c_atomic_order_acq_rel// 
feature it is undefined behavior.


Repository:
  rG LLVM Github Monorepo

CHANGES SINCE LAST ACTION
  https://reviews.llvm.org/D106111/new/

https://reviews.llvm.org/D106111

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