Understanding the FETCH-EXECUTE Overlap Cycle

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The FETCH-EXECUTE overlap cycle refers to the process where the execution of the current instruction overlaps with the fetching of the next instruction, enhancing CPU efficiency. This technique is akin to pipelining, which minimizes idle clock cycles by ensuring that the next instruction is ready for execution as soon as the current one completes. Overlapping is common in modern CPUs, as it allows for smoother instruction processing, especially in sequential code execution. However, jumps in memory locations can disrupt this flow, leading to potential delays. Overall, FETCH-EXECUTE overlap is a critical feature in optimizing CPU performance.
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What does the FETCH EXECUTE OVERLAP instruction mean ?
 
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berkeman said:
It just looks like the execute of the current instruction is overlapped a bit with the fetching of the next instruction:

http://www.geocities.com/siliconvalley/peaks/3938/z80arki.htm

that does almost seem to be a something you would expect with pipelining or else you would have some gap of clock cycles between the stages each time the cpu fetches a new instruction.

how common is the fetch-execute overlapping in modern cpus? it seems common sense to have the next instruction fetched by the time the preceding one is executed unless the code jumps memory locations . .
 
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