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TMS320C6657: CPU运行时出现pipeline stall,一句汇编指令运行了2000个cycle

Part Number: TMS320C6657

6657的裸机程序运行时,监控一段时间的CPU指令执行情况,发现频繁出现pipeline stall:

一句汇编指令可能本来只需要1-2个cycle,结果执行了2000多个cycle。

请问会是什么原因导致的呢?