TMS570LC4357: TI: 10.1.0.00010 / Compiler: v20.2.1.LTS - Alignment of a specific function

Mathieu Quenpt

Prodigy 210 points

Part Number: TMS570LC4357

Does someone know a pragma directive to align a C function?

Compiler: TI: 10.1.0.00010 / Compiler: v20.2.1.LTS

Thanks

Mathieu

over 2 years ago

0 Mathieu Quenpt over 2 years ago

Prodigy 210 points

Unfortunately #pragma CODE_ALIGN(function, constant) does not work.

Compiler output: line 833: warning #163-D: unrecognized #pragma

0 jagadish gundavarapu over 2 years ago in reply to Mathieu Quenpt

TI__Guru 70551 points

Hi Mathieu,

Yeah CODE_ALIGN didn't work for me as well.

You can try aligned attribute, i tested it worked for me.

Here is an example to align to 32byte

In above example it aligns start address of delay function to 32byte multiples.

Thanks & regards,
Jagadish.

0 Mathieu Quenpt over 2 years ago in reply to jagadish gundavarapu

Prodigy 210 points

Thanks so much Jagadish! It unfortunately does not work for me. I don't get any warning using aligned attribute. But the function is not aligned as specified. For info I use thumb instruction (--code_state=16).

__attribute__((aligned(256))) void function()

From MAP-File:

0005e241 function

0 Chester Gillon over 2 years ago

Guru 92251 points

Mathieu Quenpt said:
Compiler: TI: 10.1.0.00010 / Compiler: v20.2.1.LTS

I had previously reported Compiler/TM4C129XNCZAD: TI ARM v20.2.3.LTS compiler doesn't seem to support code alignment, as a result of which the issue EXT_EP-10161 - ARM compiler manual incorrectly claims #pragma CODE_ALIGN is supported was raised.

Based upon the work-around described in EXT_EP-10161 as of compiler ARM 18.12.8.LTS and ARM 20.2.5.LTS attribute aligned should work. I haven't yet tested this.