[LLVMdev] RFC - Profile Guided Optimization in LLVM

[Diego Novillo]

On 2013-06-15 14:18 , Evan Cheng wrote:
> 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.
>

Excellent!  We are initially interested in instrumentation, as well.  
This is where we draw most of our performance with GCC. Sampling is 
showing a lot of promise, however.  And it really is not much different 
than instrumentation.  Most of what changes is the source of profile data.

> 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.

Sure. My initial plan is fairly simple.  Triage the existing 
instrumentation code and see what needs fixing.  I'm starting this in 
the next week or so.  What are your plans?


Diego.
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