Binyamin Dissen wrote:
I was going to use PLO to do a compare/swap/store, with the compare/swap on the count and a store into the chain (possibly into the head pointer - thus both words in the doubleword would be accessed as single words). Obviously I would get bad results if the load of the chain header/count did not get a consistent result.
Block concurrency rules state that LM and STM against a doubleword will always see an all-or-nothing result. But, this doesn't obviate the need for PLO in the circumstances in which it's needed -- e.g., to traverse or update a linked-list.
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