In both cases, the CPU might "discard" the write, if there are no
intervening
reads or writes to the same location. The only difference between
your
How can it know that?
Because it holds the cache line in the "O" (owned) state, for example.
And it doesn't matter how a CPU would do this; the only thing that
matters is that you do not assume anything that is not guaranteed
by the model.
Segher
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