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mismatching instruction cycles between the simulator and manual

jay kim

Hi,

While evaluating the efficiency of Cortex-M4, I found that simulator's cycle counts for several instructions are inconsistent with the manual.
For example, the simulator counts 3 cycles for SMULL, while it is denoted as 1 in the Cortex-M4 technical reference manual (doc number DDI0439C, table3-1).

please someone tell me which one is correct??

I am using MDK-ARM 4.60 eval. with 'generic Cortex-M4' setting.

Thanks and regards,
jay

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