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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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    Note: This was originally posted on 11th July 2011 at http://forums.arm.com


    Hi Etienne. Have a good day

    So far, I found some instructions that your cycle count module can't analyze. I don't know why.
    Please check and give me some explanations:

    vbic.i16 d0, #1 ; 0x0001
    vbic.i32 q2, #1 ; 0x00000001

    vmov.i16 q0, #1 ; 0x0001
    vmov.i16 d0, #1 ; 0x0001

    vmvn.i16 q1, #1 ; 0x0001
    vmvn.i16 d1, #1 ; 0x0001

    vorr.i16 q0, #1 ; 0x0001
    vorr.i16 d0, #1 ; 0x0001

    Dung


    Hi dung.

    You're right.
    It was missing a callback that check the validity of the immediate value.
    I've added it now.

    Thank's

    Etienne
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  • 0
    Note: This was originally posted on 11th July 2011 at http://forums.arm.com


    Hi Etienne. Have a good day

    So far, I found some instructions that your cycle count module can't analyze. I don't know why.
    Please check and give me some explanations:

    vbic.i16 d0, #1 ; 0x0001
    vbic.i32 q2, #1 ; 0x00000001

    vmov.i16 q0, #1 ; 0x0001
    vmov.i16 d0, #1 ; 0x0001

    vmvn.i16 q1, #1 ; 0x0001
    vmvn.i16 d1, #1 ; 0x0001

    vorr.i16 q0, #1 ; 0x0001
    vorr.i16 d0, #1 ; 0x0001

    Dung


    Hi dung.

    You're right.
    It was missing a callback that check the validity of the immediate value.
    I've added it now.

    Thank's

    Etienne
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