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TMS320C6455: Is there a "MAX" instruction in C64+?

weslly li
Intellectual 390 points
Part Number: TMS320C6455

Hi,

I'm trying optimization to my code on TMS320C6455, and I feel quite strange there is no assembly instruction of "MAX" to get larger number of two 32-bit intergers. Just provide "MAX2" for 16-bit short integers.

Am i right? And how to do MAX to 32-bit integers in an easy way?

thanks,

Weslly.

  • 0
    Intellectual 390 points
    BTW, I'm using instrisic instructions inside my C code.
  • 0
    TI__Guru**** 161600 points
    Hi,

    I've notified the sw team. Their feedback will be posted here.

    Best Regards,
    Yordan
  • 0
    TI__Guru* 84110 points

    Weslly,

    Use the C function for max() and look at the assembly generated to see how it was done. That will generally be the best way to do it in your hand assembly/intrinsic version.

    Other than that, the answer will be highly dependent on the exact algorithm you are trying to implement. A single stand-alone max(32,32) would take 2 cycles to compare and conditionally move. Multiple max(32,32) operations can be pipelined and can be combined into a much smaller set of execution packets. But I do not believe either the single or multiple can be accomplished with intrinsics explicitly. But if you write the code using the C function/macro and use the best optimization features, the compiler should generate good code for you.

    Regards,
    RandyP