Not very well. 32-bit IPCCOUNTERH and 32-bit IPCCOUNTERL. When the value of IPCCOUNTERL is read, the value of IPCCOUNTERTH is saved. When the value of IPCCOUNTERH is read after death, the saved value is returned. How exactly do these two counters work? For example, IPCCOUNTERH and IPCCOUNTERL will count at the same time, and the count between the two is not affected by each other. Or IPCCOUNTERL counts to 32'hFFFF_FFFF before IPCCOUNTERH starts counting. And during the IPCCOUNTERH count, the value of IPCCOUNTERL remained at 32'hFFFF_FFFF. After knowing that IPCCOUNTERH counts to 32'hFFFF_FFFF, IPCCOUNTERL returns to 0 again to start counting.
