In my short search, I didn&#x27;t see evidence that either package has run-time dispatch based on the processor type.<p>I don&#x27;t see &quot;cpuid&quot; used in the scipy code base, and the only intrinsic I found is specifically in a MS Windows #ifdef.<p>Numpy doesn&#x27;t use cpuid. It does have compile-time options for intrinsics, but not run-time.