[LLVMdev] LLVM profiling

[Xinliang David Li]

It is currently done in Clang FE: tools/clang/lib/CodeGen/CodeGenPGO.cpp --
CodeGenPGO::assignRegionCounters(..)

David


On Tue, May 26, 2015 at 7:34 AM, John Criswell <jtcriswel at gmail.com> wrote:

> Dear Naveed,
>
> Have you verified that edge profiling was integrated into LLVM? This paper
> applies a patch to an older version of LLVM to add the edge profiling
> feature, so it looks like edge profiling wasn't integrated into LLVM at
> that time.  It's not clear to me whether it was added after the paper was
> published and whether that feature still exists.
>
> A simple grep on trunk does not show an LLVM pass providing the
> insert-edge-profiling command line option.  A quick Google search shows
> something like an edge profiling pass in LLVM 3.3 (
> https://llvm.org/svn/llvm-project/llvm/branches/release_33/lib/Transforms/Instrumentation/OptimalEdgeProfiling.cpp),
> but I don't see that code in LLVM trunk now.
>
> I don't use LLVM's profiling features myself.  Other people that work on
> the profiling code can better tell you whether edge profiling exists in
> LLVM now or existed in a previous version.  If you don't hear from anyone
> within the next few days, please start a new thread on the mailing list
> with a subject of "Edge Profiling Support" (a more specific thread title
> can sometimes elicit more responses).
>
> Regards,
>
> John Criswell
>
>
> On 5/25/15 3:08 PM, Naveed Ul Mustafa wrote:
>
>> Hi guys,
>>
>> I am trying to perform edge profiling using on hello.bc file by using
>> following command
>>
>> opt -insert-edge-profiling hello.bc -o hello-edge.bc
>>
>> but I get the error that option "-insert-edge-profiling" is unknown. Can
>> you please help me to solve the issue. Please note that I am following the
>> paper available at this link
>> http://llvm.org/pubs/2010-12-Preuss-PathProfiling.pdf
>>
>> Thanks
>>
>> Naveed Ul Mustafa
>>
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>
>
> --
> John Criswell
> Assistant Professor
> Department of Computer Science, University of Rochester
> http://www.cs.rochester.edu/u/criswell
>
>
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