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

Julia Li

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

9 months ago

0 George Mock 9 months ago

TI__Guru**** 244430 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 Julia Li 9 months ago in reply to George Mock

TI__Expert 3830 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 Julia Li 9 months ago in reply to George Mock

TI__Expert 3830 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 George Mock 9 months ago in reply to Julia Li

TI__Guru**** 244430 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

C2000™︎ microcontrollers

C2000 microcontrollers forum

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