B.1. About instruction cycle timing
This chapter provides information to estimate how much execution
time particular code sequences require. The complexity of the Cortex-A9
processor makes it impossible to calculate precise timing information
manually. The timing of an instruction is often affected by other
concurrent instructions, memory system activity, and additional events
outside the instruction flow. Detailed descriptions of all possible
instruction interactions and all possible events taking place in
the processor is beyond the scope of this document.