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+2  Q: 

How does _mm_mwait works?

Hello

How does _mm_mwait from pmmintrin.h works? (I mean not the asm for it, but action and how this action is taken in NUMA systems. The store monitoring is easy to implement only on bus-based SMP systems with snooping of bus.)

What processors does implement it?

Is it used in some spinlocks?

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