| Value | Meaning |
|---|---|
| raw0 | Not sequenced. Corresponds to LLVM AtomicOrdering.Monotonic and C++11/C11 memory_order_relaxed. |
| acq2 | Hoist-load + hoist-store barrier. Corresponds to LLVM AtomicOrdering.Acquire and C++11/C11 memory_order_acquire. |
| rel3 | Sink-load + sink-store barrier. Corresponds to LLVM AtomicOrdering.Release and C++11/C11 memory_order_release. |
| acq_rel4 | Acquire + release barrier. Corresponds to LLVM AtomicOrdering.AcquireRelease and C++11/C11 memory_order_acq_rel. |
| seq5 | Fully sequenced (acquire + release). Corresponds to LLVM AtomicOrdering.SequentiallyConsistent and C++11/C11 memory_order_seq_cst. |
Specifies the memory ordering semantics of an atomic operation.