llvm dev - Apr 2014 - [LLVMdev] LVLM runtime optimization during LLVM Analysis Passes.

Hi
        Does current llvm support dynamic optimization level for 
generated llvm IR which means , is it possible to monitor some 
function's execution pattern during the runtime and apply different 
optimization level for particular function using LLVM Analysis Passes.

Thanks

Regards
Sri.
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On the optimization side, profile guided opts are currently somewhat 
limited.  However, a couple of folks are actively working in this area.

All of the runtime support (i.e. recompiling, linking, etc..) is out of 
scope for LLVM.  Since this is the majority of the work required to 
support PGO in a JIT, that's probably your answer.

p.s. I'm answering what I *think* your question was.  If this doesn't 
help, you'll need to clarify your question.

Philip

On 04/07/2014 01:20 PM, Sri wrote:
> Hi
>        Does current llvm support dynamic optimization level for 
> generated llvm IR which means , is it possible to monitor some 
> function's execution pattern during the runtime and apply different 
> optimization level for particular function using LLVM Analysis Passes.
>
> Thanks
>
> Regards
> Sri.
>
>
> _______________________________________________
> LLVM Developers mailing list
> LLVMdev at cs.uiuc.edu         http://llvm.cs.uiuc.edu
> http://lists.cs.uiuc.edu/mailman/listinfo/llvmdev
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Hi Philip
            I understood what you have said here. Basically you are 
saying , identifying the hot path during the runtime and compile those 
section again would be hard in llvm-IR. I am currently looking forward 
to do some analysis work on adaptive mechanism for llvm JIT so that , we 
can see some improvement when we see that high frequent function call 
during the run time. Do you have any idea , which approach would be more 
convenient to start this work.
Thanks.

Regards
Sri.
On 04/09/2014 08:58 PM, Philip Reames wrote:
> On the optimization side, profile guided opts are currently somewhat 
> limited.  However, a couple of folks are actively working in this area.
>
> All of the runtime support (i.e. recompiling, linking, etc..) is out 
> of scope for LLVM.  Since this is the majority of the work required to 
> support PGO in a JIT, that's probably your answer.
>
> p.s. I'm answering what I *think* your question was.  If this
doesn't
> help, you'll need to clarify your question.
>
> Philip
>
> On 04/07/2014 01:20 PM, Sri wrote:
>> Hi
>>        Does current llvm support dynamic optimization level for 
>> generated llvm IR which means , is it possible to monitor some 
>> function's execution pattern during the runtime and apply different
>> optimization level for particular function using LLVM Analysis Passes.
>>
>> Thanks
>>
>> Regards
>> Sri.
>>
>>
>> _______________________________________________
>> LLVM Developers mailing list
>> LLVMdev at cs.uiuc.edu          http://llvm.cs.uiuc.edu
>> http://lists.cs.uiuc.edu/mailman/listinfo/llvmdev
>
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