What will happen if program counter misses?

If the program counter (PC) misses, it typically means that the next instruction to be executed cannot be fetched from memory due to a cache miss or an invalid address. This can lead to delays as the system must retrieve the correct instruction from a slower memory hierarchy, such as main RAM. In some architectures, this might also trigger an exception or interrupt, requiring the system to handle the error and potentially stall or restart the instruction fetch process. Overall, a PC miss can significantly impact performance and execution flow.