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wrong cycle timing of instructions on ARM11

chandrakala reddy
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Note: This was originally posted on 4th February 2013 at http://forums.arm.com

Hi,

Iam using RVDS3.0 for ARM11. some of the instructions are not executing in the time specified by the ARM documentation. for example, according to ARM documents, SMLAD instruction has to take 1 cycle for execution and 2 stalls if the result is immediatly used. but in real time, it is taking 2 cycles for execution. is it a bug on RVDS3.0 or am i missing any thing here. can any one please help me out.

Regards,
Chandrakala
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    Note: This was originally posted on 4th February 2013 at http://forums.arm.com

    Hi,

    Thanks for the reply. there is no register dependency in the code.

    Following is my code

    SMLAD   r0, r1, r2, r3
       SMLAD   r4, r5, r6, r7
       SMLAD   r8, r9, r10, r11
       SMLAD   r12, lr, r1, r6

    Is there any issue with the code?

    Regards,
    Chandrakala
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  • Offline
    Note: This was originally posted on 4th February 2013 at http://forums.arm.com

    Hi,

    Thanks for the reply. there is no register dependency in the code.

    Following is my code

    SMLAD   r0, r1, r2, r3
       SMLAD   r4, r5, r6, r7
       SMLAD   r8, r9, r10, r11
       SMLAD   r12, lr, r1, r6

    Is there any issue with the code?

    Regards,
    Chandrakala
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