It uses a different serialization mechanism than PLO.  From the POPs:

Programming Notes:

1. COMPARE AND SWAP AND STORE may be used in conjunction with other 
   COMPARE AND SWAP or COMPARE DOUBLE AND SWAP instructions to 
   manipulate locks, queue pointers, or other fields that require 
   interlocked updates.

2. COMPARE AND SWAP AND STORE should not be used to manipulate 
   fields that are also manipulated by PERFORM LOCKED OPERATION.


At 11:40 AM 5/31/2007, Edward Jaffe wrote:
  
>Binyamin Dissen wrote:
>>What does CSST give over PLO?
>>  
>
>The new instruction may be a hardware implementation of this functionality.



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