[LLVMdev] RFC - Profile Guided Optimization in LLVM

[Evan Cheng]

Apple folks are also gearing up to push on the PGO front. We are primarily interested in using instrumentation, rather than sampling, to collect profile info. However, I suspect the way profile ended up being used in the various optimization and codegen passes would be largely similar. 

There is also some interests in pursuing profile directed specialization. But that can wait. I think it makes sense for us to get together and discuss our plans to make sure there won't be duplication of efforts. 

Evan

Sent from my iPad

On Jun 12, 2013, at 4:26 PM, Xinliang David Li <xinliangli at gmail.com> wrote:

> 
>> 
>> After the basic profile-based transformations are working, I would like to add new sources of profile.  Mainly, I am thinking of implementing Auto FDO.
> 
> For those who are not familiar with what autoFDO is -- Auto FDO is originally called Sample Based FDO. Its main author is Dehao Chen @google, and Robert Hundt is the one of the main pushers of technology in Google. The latest incarnation of this technology uses LBR events available on Nehalem and above.  http://www.computer.org/csdl/trans/tc/2013/02/ttc2013020376-abs.html
> 
> Cheers,
> 
> David
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