[llvm-dev] [RFC] Function stack size section.

[keita abdoul-kader via llvm-dev]

Hello Sean,
I can't really comment on the implementation details ( optimization remarks
vs object section); But we would certainly be interested in a generic way
to extract stack size information.

On the subject of stack size, have you done any gcc vs llvm comparison ?
Last time we look at it, LLVM seems to generate larger stack size than gcc
(especially at higher inline thresholds) . I am curious if other people
have noticed the same thing.

Compiler Engineering @ Facebook,inc.

On Thu, Aug 31, 2017 at 7:09 AM, Sean Eveson via llvm-dev <
llvm-dev at lists.llvm.org> wrote:

> Hi All,
>
>
>
> We have a local change in the X86AsmPrinter that outputs a section
> containing metadata on function stack sizes. We use this to measure changes
> to stack size between versions of the compiler and it also allows our
> licensees to do the same for their code.
>
>
>
> The section simply contains pairs of function symbol references (8 byte)
> and stack sizes (unsigned LEB128).
>
>
>
> We would like to upstream this change as a PS4 only modification, or as a
> more general cross platform one.
>
>
>
> Would people be interested in (or happy with) such a patch, target
> specific or otherwise?
>
>
>
> Thanks,
>
> Sean Eveson
> SN Systems - Sony Interactive Entertainment
>
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>
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