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An Interview with Zen Chief Architect Mike Clark
Zen is one of the most important microarchitectures in the history of the x86 ecosystem.
Subscribers to Computer Enhance will recognize many of them as ones we’ve collectively wondered about during Q&A’s in the Performance-Aware Programming series- and I’m delighted to report that, as you’ll see, Mike gave detailed answers to all of them. But tying it back to the ARM-ISA-weakly-ordered discussion, nontemporal stores, while not exactly being weakly ordered, are in some ways easier to deal with in the base case. CASEY: Random question number three: if you look at a single-uop instruction like sqrtpd that has a latency longer than the pipeline depth of an execution unit, can you give a cursory explanation of how this works for those of us on the software side who don't understand hardware very well?
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