[LLVMdev] counting branch frequencies

[apala guha]

Thanks Alastair.

Is it possible to associate the branch frequency counts with the basic blocks
in the intermediate representation? (e.g. Can I access basic block
frequencies in runOnFunction()?)


Also, I was able to produce a 'llvmprof.out' file. What is the format of this file? How can I parse it?


  Thanks.
-Apala

>
>
> On 09/07/2012 01:25 PM, Alastair Murray wrote:
> >  Hi Apala,
> >
> >  Do you mean is it possible to count branch taken/not-taken frequencies?
> >
> >  If so then in the svn version (i.e. not 3.1) there is
> >  -profile-metadata-loader which sets branch weight metadata based on
> >  profiling data (compile with -insert-edge-profiling and run your
> >  program to generate that).
> >
> >  Within 3.1 there is -profile-loader which sets block execution counts
> >  which can be used to infer branch taken/not-taken frequencies -- but
> >  the whole interface is not as friendly.
> >
> >  Regards,
> >  Alastair.
> >
> >  On 07/09/12 10:46, Apala Guha wrote:
> >>  Hi,
> >>
> >>  Is there a way to count branch frequencies using LLVM infrastructure?
> >>
> >>  Thanks.
> >>
> >>  -Apala
> >>
> >>  Postdoctoral Scholar
> >>
> >>  Department of Computer Science, University of Chicago
> >>
> >>  Computation Institute, Argonne National Laboratory
> >>
> >>  http://sites.google.com/site/apalaguha/home/
> >>
> >>
> >>
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> >
>