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TMS320F280039C: Need to reduce running cycle of the judgment operation and need benchmark

Julia Li
Expert 3820 points
Part Number: TMS320F280039C

Tool/software:

Hi Champs,

Customer have found that our code takes a long time to run with judgment operation, which is much slower than other operations.

For example:


if (V2 == 1)
{
V3 = 1；
}This takes 0.1us to run


if ((V4 == 1U) && (V5 == 1U))
{
V6 = 1；
}This takes 0.142us to run

Customer tried to increase the optimization level, but the time did not decrease. Is there a way to reduce the running time of this logical operation? In addition, do we have a benchmark for logical operations that we can provide to customer?

Thanks!

 

Best Regards,

Julia

  • 0
    TI__Guru**** 244300 points

    For one source file which contains code similar to ...

    Julia Li said:

    if (V2 == 1)
    {
    V3 = 1；
    }This takes 0.1us to run


    if ((V4 == 1U) && (V5 == 1U))
    {
    V6 = 1；
    }This takes 0.142us to run

    ... please follow the directions in the article How to Submit a Compiler Test Case.  So we know where to focus, please add a comment similar to /* PROBLEM HERE */.

    Thanks and regards,

    -George

  • 0 in reply to George Mock
    TI__Expert 3820 points

    Hi George,

    I'll discuss with customer if they can provide test cases. We want to make sure that there is a benchmark related to the judgment statement? 

    Thanks!

     

    Best Regards,

    Julia

  • 0 in reply to George Mock
    TI__Expert 3820 points

    Hi Geodge,

    Customer and I use below method to test the run clock, and below operations will cost 6~7 clock. Is this time can be reduced?

    if (V2 == 1)
    {
    V3 = 1;
    }

    Best Regards,

    Julia

  • +1 in reply to Julia Li
    TI__Guru**** 244300 points

    Build with the compiler option --opt_level=2 or higher.  So that the code which uses V2 and V3 is not completely removed, make them parameters to the current function, and pass them on as arguments to some other function.  Put the other function in a different file.

    Julia Li said:
    Is this time can be reduced?

    This change to a higher level of optimization will do it.

    Thanks and regards,

    -George