AutoFDO profile toolchain is open-sourced

[Ilya Palachev]

Hi,

Here are some questions about AutoFDO.

On 08.05.2014 02:55, Dehao Chen wrote:
> We have open-sourced AutoFDO profile toolchain in:
>
> https://github.com/google/autofdo
>
> For GCC developers, the most important tool is create_gcov, which
> converts sampling based profile to GCC-readable profile. Please refer
> to the readme file
> (https://raw.githubusercontent.com/google/autofdo/master/README) for
> more details.

In the mentioned README file it is said that " In order to collect this 
profile, you will need to have an Intel CPU that have last branch record 
(LBR) support." Is this information obsolete? Chrome Canary builds use 
AutoFDO for ARMv7l 
(https://code.google.com/p/chromium/issues/detail?id=434587)

What about Aarch64 support? Is it supported?

> To use the profile, one need to checkout
> https://gcc.gnu.org/svn/gcc/branches/google/gcc-4_8. We are working on
> porting AutoFDO to trunk
> (http://gcc.gnu.org/ml/gcc-patches/2014-05/msg00438.html).

For now AutoFDO was merged into gcc-5.0 (trunk) branch.
Is it possible to backport it to 4.9 branch? Can you estimate required 
efforts for that?

>
> We have limited doc inside the open-sourced package, and we are
> planning to add more content to the wiki page
> (https://github.com/google/autofdo/wiki). Feel free to send me emails
> or discuss on github if you have any questions.
>
> Cheers,
> Dehao

--
Best regards,
Ilya