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Ch5 管線化(Pipeline)
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51. Precise Exception、Pipeline、EPC
#CC-05-051
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Precise Exception
Pipeline
EPC
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Regarding exceptions in a pipelined processor:
A
"Precise exceptions" imply that the processor state can be recovered exactly as it was before the faulting instruction executed.
B
When an exception occurs, the pipeline must flush instructions that occurred after the faulting instruction.
C
Handling exceptions is easier in a pipelined processor than in a single-cycle processor.
D
The EPC (Exception Program Counter) stores the address of the instruction that caused the exception.
E
External interrupts (like I/O requests) are synchronous events tied to the CPU clock.
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