Simulation method and simulation system

A simulation system, comprising:

• a non-transitory memory, storing a processor model and an execution model;
• and
• a hardware processor, coupled to the non-transitory memory and performs:
• simulating, by executing the processor model, a target processor to generate a plurality of first branch prediction information associated with a first branch instruction;
• receiving, by executing the processor model, a first fetch start message from the processor model, wherein the first fetch start message comprises a first fetch address;
• calling, by executing the processor model, a real-time emulation engine to control a physical machine to fetch and execute the first branch instruction according to the first fetch address;
• obtaining, by executing the processor model, a plurality of first branch instruction information of the first branch instruction from the real-time emulation engine and providing, by executing the processor model, the plurality of first branch instruction information to the processor model;
• and
• in response to determining that the plurality of first branch prediction information do not exactly match the plurality of first branch instruction information, recording, by executing the processor model, a first processor status of the physical machine and enforcing, by executing the processor model, the real-time emulation engine to execute a first speculation operation according to the plurality of first branch prediction information.