TMS320F280049C: Much more execution time from migration from COFF to EABI

Johnny Chen

Expert 5080 points

Part Number: TMS320F280049C

Tool/software:

Hi Champ,

I am asking for my customer.

They used to use COFF output format on F280049C, and they are migrating to EABI output format.

With the same piece of code, changing COFF to EABI, the execution time of the same ISR, EABI takes 4 times longer than COFF. The compiler opt. level is set to OFF since old image with COFF is fixed, couldn't be changed.

Going through the migration guide from below html, the possible impact comes to our mind is ONLY the double data type length change (32 bits -> 64 bits), may have affected the code execution time.

https://software-dl.ti.com/ccs/esd/documents/C2000_c28x_migration_from_coff_to_eabi.html

Besides this, what else are needed to be noticed or something different can cause the execution time takes longer with EABI format ? would the expect explicitly list down all the affecting factors ?

Thanks and regards,

Johnny

3 months ago

0 Ozino Odharo 3 months ago

TI__Mastermind 21275 points

Hi Johnny,

Can you confirm if you have this setting in your project settings.

--float_operations_allowed=32

Notice that the double floating-point type is 64 bits wide in the EABI model, but 32 bits wide in the COFF ABI model. To make your code portable between COFF ABI and EABI, you should declare 32-bit floating-point variables as float, not as double.

Let me know if you've done this.

https://software-dl.ti.com/C2000/docs/optimization_guide/phase1/index.html See this to learn more about performance impact caused by the data type.

Regards,

Ozino

C2000™︎ microcontrollers

C2000 microcontrollers forum

TMS320F280049C: Much more execution time from migration from COFF to EABI