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TMS320F280039C: Bitwise operation in generated CLA instructions by the compiler

Wayne Huang
Genius 16685 points
Part Number: TMS320F280039C


Tool/software:

Hi champs,

I am asking this for our customer.

The user finds the same bit-field C code for bitwise manipulation, CLA usually use more instructions than CPU when -O2 is used for both CPU and CLA.

Questions:

1. Is there any better and efficient way for the user to generate efficient CLA instruction codes for bitwise operations except for manual assembly?

2. Do you suggest using -O3 and/or higher?

Wayne

  • +1
    TI__Guru**** 251230 points

    For the source file where this occurs ...

    Wayne Huang said:
    the same bit-field C code for bitwise manipulation, CLA usually use more instructions than CPU when -O2 is used for both CPU and CLA

    ... please follow the directions in the article How to Submit a Compiler Test Case.  Without that test case, I can only guess at answers to these questions.

    Wayne Huang said:
    1. Is there any better and efficient way for the user to generate efficient CLA instruction codes for bitwise operations except for manual assembly?

    I don't think so.  I doubt manual assembly would be much better.  

    Wayne Huang said:
    2. Do you suggest using -O3 and/or higher?

    It is easy to try.  I suspect there would be some improvement, but not a lot.

    Thanks and regards,

    -George