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Questions about memory barriers

Time:05-26

Memory barrier is divided into four kinds:
1. LoadLoad Barriers 2. StoreStore Barriers 3. LoadStore Barriers 4. StoreLoad Barriers
I will see the difference, but many articles said StoreLoad Barriers this barrier is a universal barrier, is really don't understand about this, StoreLoad Barriers is how can have the effect of the three other barrier?
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