> This seems to imply that we need the lock prefix even when updating
> different bits within the same long (not just the same byte). Is this
> interpretation correct?
Yes, that is what I said. The consistency applies to loads/stores
(so e.g. for 128bit SSE2 load/stores too), not bytes.
The current IA32 manuals have a more detailed description of the rules
in volume 3
-Andi
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