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The MFENCE instruction is used to stall the instruction fetch pipeline until the completion of all CPU-triggered memory transactions.
For example, 1. STORE_A 2. MFENCE 3. TRANSACTION_B The MFENCE implementation stalls the CPU until the memory system asserts that there are no transactions "in flight," i.e. it is idle. This prevents the CPU from proceeding to TRANSACTION_B before STORE_A completes
