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C6657 mathlib reciprocal mathlib loop buffer exception

Fawad Nackvi62335
Expert 1080 points
Other Parts Discussed in Thread: MATHLIB

Hello,

I am getting a "Loop buffer exception Missed stall exception" in my C6657 EVM.  I have traced this to the reciprocal function in the math library. The exception takes a random amount of time to happen.  Anywhere between 5 seconds to 1 minute.  I am doing the reciprocal of a 128 point vector about 2000 times a second (in addition to other processing).

I am using mathlib_c66x_3_0_1_1.  I also use other math functions from the library without any issues.

Any ideas why this may be happening?

Thanks,

Fawad

  • 0
    TI__Guru* 84110 points

    Fawad,

    Can you provide a test case that demonstrates this exception occurring? A random exception sounds difficult to reproduce with just a high-level description, or even a more detailed one. It could be data sensitive, for example.

    Have you tried re-running with the same 128-point vector to see if it always fails with a certain set of data?

    Regards,
    RandyP

  • 0 in reply to RandyP
    Expert 1080 points

    RandyP,

    So further testing has shown it is the calling function that has the exception instead of the mathlib reciprocal function.  I can stop the exception by compiling with less optimization (-01 instead of -02) for the calling code.  So for now I will mark this issue fixed.

    Thanks,

    Fawad

  • 0 in reply to Fawad Nackvi62335
    TI__Guru* 84110 points

    Fawad,

    Thanks for the update. We would still like to see a test case, if this is a case of the optimizer generating bad code.

    Up to you, of course.

    Regards,
    RandyP