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TMS320F28069: CLA operation performance

Johnny Chen
Expert 3840 points
Part Number: TMS320F28069

Tool/software:

Hi Champ,

I asking for my customer about CLA.

1. Does CLA have a speed difference between int/short/float operation with those data types ? or as long as dealing with floating-point operation, then it wouldn't have much affect on CLA operation performance ?

2. User uses lots of  #if for conditional expression, any intrinsic instruction set to speed up ? From the understanding, it takes much time for dealing with #if conditional expression.

Thanks and regards,

Johnny

  • 0
    TI__Expert 8260 points

    Hi Johnny,

    I will look into this and get back to you.

    Best Regards,

    Delaney

  • +1 in reply to Delaney Woodward
    TI__Expert 8260 points

    Hi Johnny,

    I apologize for the long delay.

    Johnny Chen said:
    1. Does CLA have a speed difference between int/short/float operation with those data types ? or as long as dealing with floating-point operation, then it wouldn't have much affect on CLA operation performance ?

    It depends on the operations done, but the CLA is very good at floating-point but not so great at non-floating-point (fixed point math, string manipulations, general code, moving things around etc).  Also note that the CLA also doesn't have an integer multiply. If dealing with floating point variables, in general you should not see performance issues.

    I would suggest looking at how many compiler instructions are generated in the disassembly window for each line of code to make sure that no instructions require a large amount of CLA instructions. As long as each line of CLA code translates to only a small number of CLA assembly instructions, they shouldn't experience any performance issues.

    Johnny Chen said:
    2. User uses lots of  #if for conditional expression, any intrinsic instruction set to speed up ? From the understanding, it takes much time for dealing with #if conditional expression.

    Are they concerned with the speed of compilation? #if statements will be handled at compile time so there should be no performance hit during the code execution associated with these statements.

    Best Regards,

    Delaney