Compiler Optimization settings

Usman Ibrahim

Salam.

I am optimizing a program in CCS .In compiler optimization settings when i select (Local -o1 ) it gives correct results but when i choose (function -o2) or (file -o3) optimization settings then i don't get correct answers can anyone explain this to me.

over 14 years ago

0 Ki over 14 years ago

TI__Guru**** 463291 points

Salam.

If you are having issues with debug visibility, this topic may shed some light:

http://processors.wiki.ti.com/index.php/Debug_versus_Optimization_Tradeoff

Thanks

0 sathish viswanathan58249 over 14 years ago

Prodigy 90 points

Hi Salam,

During the process of optimization, there is possibility some lines (if used/updated once say to value '0') could be removed. I faced similar situation. Then I declared the variable to volatile and it worked.

Please check if some thing like this happened to you

The compiler analyzes data flow to avoid memory accesses whenever possible. If you have code that depends on memory accesses exactly as written in the C/C++ code, you must use the volatile keyword to identify these accesses.
Please see also "TMS320C6000 Optimizing Compiler v 7.0 User's Guide"

Regards,

Sathish

0 Krishna15134 over 14 years ago in reply to sathish viswanathan58249

Prodigy 80 points

After the compilation and loading the .out file, you could check whether assembly code is generated for the particular functionality or not. you could check the following using "view -> mixed Source/ASM" option. '-o3' does the highest level of optimization. I suggest you to analyze your code properly and optimize your code.

-Krishna

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Compiler Optimization settings