public void Initialize()
{
// up to 4 retire slots used each cycle
cpu.ProgramPerfCounters(GetPerfEvtSelRegisterValue(0xC2, 0x2, true, true, false, false, false, false, true, false, cmask: 1),
GetPerfEvtSelRegisterValue(0xC2, 0x2, true, true, false, false, false, false, true, false, cmask: 2),
GetPerfEvtSelRegisterValue(0xC2, 0x2, true, true, false, false, false, false, true, false, cmask: 3),
GetPerfEvtSelRegisterValue(0xC2, 0x2, true, true, false, false, false, false, true, false, cmask: 4));
}