Sometimes, we need to program the msr to get the statistics we want. For example, to get cycles in transactions, we need to configure IA32_PERFEVTSEL2 with the IN_TX and IN_TXCP filters and use Unhalted_Core_Cycles will get the cycles in transactions. But vtune exposes this kind of interface? Or we need program the msr manually before the profiling?
For more complete information about compiler optimizations, see our Optimization Notice.