CCS/MSP430FR5949: MSP430FR5949

Jan Volkering

Intellectual 530 points

Part Number: MSP430FR5949

Tool/software: Code Composer Studio

Hi,

I entered the below question under an old, closed thread so maybe you do not see it

I ran into a strange behaviour of the C-compiler for the MSP430.

If I compile code with the -0 option on (register optimization) the compiler just skips lines of C code.

If I switch all optimization off, the compiler wors as expected.

\Below pieces of dis-assembly indicating which C-lines re left out

this piece of code is without optimization.

Look at the code after the lines

if((RC5Code & S2Mask) == 0;

Code += 64;

The C- lines

Address = ((RC5Code & AddressMask) >>6);

ïf (Address == AmpAddress)

have dissapeared.

this is the dis-assembly with -0 optimization

Do you have an explanation for that?

over 8 years ago

0 Ki over 8 years ago

TI__Guru**** 477651 points

Hi Jan,
I moved your post to the compiler forum. The experts here can help you best.

Please see the below link regarding additional information needed by the compiler experts to help debug your issue:
software-dl.ti.com/.../sdto_cgt_How-to-Submit-a-Compiler-Test-Case.html

Thanks
ki

0 George Mock over 8 years ago

TI__Guru**** 252950 points

Using optimization changed your code around quite a bit. As one example, notice how far the "return 0;" statement moved. It is likely the optimized code, while quite different, does the same thing. If you send a test case using the link Ki noted, I'd be happy to check.

Thanks and regards,

-George

0 Jan Volkering over 8 years ago in reply to George Mock

Intellectual 530 points

George,

I rewrote parts of the code over the weekend to make it more structured and shorter and now I do not see this problem whilst omitting two C-lines in the compilation made my code disfunctional.

I can now use register optimization again and my code runs OK.

I have no idea why this happened but unfortunately I cannot reproduce the issue so generating a file as described won't do much good .

If it happens again I know what to do.

Thanks for the support.

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CCS/MSP430FR5949: MSP430FR5949