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Cortex A8 Instruction Cycle Timing

barney vardanyan
Note: This was originally posted on 17th March 2011 at http://forums.arm.com

Hi) sorry for bad English

I need to count latency for two instruction, and all I have is the arm cortex A 8 documantation(charter 16) !
but I have no idea how can do this work using that documantation(
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  • 0
    Note: This was originally posted on 28th April 2011 at http://forums.arm.com



    I thought the branches to .else will always be mispredict, but it was not the case.
    It could be very usefull to know the prediction algorithm (but I assume it must be quite secret ;) )!!!


    Why do you think the branch to .else will always be mispredicted?

    As I read from chapter 5: "program flow prediction" of Cortex-A8 Technical Reference Manual, it is always predicted. Have you ever read this chapter?
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  • 0
    Note: This was originally posted on 28th April 2011 at http://forums.arm.com



    I thought the branches to .else will always be mispredict, but it was not the case.
    It could be very usefull to know the prediction algorithm (but I assume it must be quite secret ;) )!!!


    Why do you think the branch to .else will always be mispredicted?

    As I read from chapter 5: "program flow prediction" of Cortex-A8 Technical Reference Manual, it is always predicted. Have you ever read this chapter?
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