> One more idea. The wrap-around case is the only one when the high word is 
quoted text
> modified. This is in fact the only case when the fetchadd.acq competes with 
> the st2.rel about the actual contents of that location. I don't know if it 
> matters...

I pondered that for a while - but I have difficulty believing that
fetchadd looks at which bits changed and only writes back the bytes
that did.

-Tony
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