#pragma DATA_ALIGN limited?

Itay Chamiel

Is it possible that in the C6000 CGTools (I use 7.4.2 under Win x64) DATA_ALIGN cannot align to powers of 2 that are higher than a certain amount? For example, I am trying to align a buffer to a 64KB boundary (0x10000) but its address in the result executable is 0x80808000 which is not aligned.

Thanks,

-itay

over 12 years ago

0 Archaeologist over 12 years ago

TI__Guru* 84285 points

Yes, the maximum alignment allowed is 32k.

0 Itay Chamiel over 12 years ago in reply to Archaeologist

Intellectual 940 points

I am in a situation where this is a real problem for me (which would require a very cumbersome workaround). Is there any reason why this limit is there? Can it be eliminated? (or at least documented, for those of us who RTFM..?)

-itay

0 Archaeologist over 12 years ago in reply to Itay Chamiel

TI__Guru* 84285 points

I don't know why the limit is there - I suspect the object file format cannot represent larger alignments.

I've submitted SDSCM00046677 as a usability defect against the assembler - the assembler should emit a warning if the alignment exceeds the maximum allowed.

I've submitted SDSCM00046678 as a documentation defect - the limit should be documented.

0 George Mock over 12 years ago in reply to Archaeologist

TI__Guru**** 251550 points

One workaround is to use the DATA_SECTION pragma to put the buffer into a section you name ...

#pragma DATA_SECTION(buffer, "mybuffer")
int buffer[BUFFER_SIZE];

Then, in the linker command file, arrange for that section to be aligned on a 64K boundary ...

mybuffer > MEMORY_RANGE_NAME, ALIGN(0x10000)

Thanks and regards,

-George

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#pragma DATA_ALIGN limited?