llvm dev - Jan 2019 - LLVM Use Def Analysis

Dear LLVM Developers,

I am a student at TU Darmstadt and I am currently working with LLVM in  
a project to extract data dependencies from a program.

Since I want to use a use-def chain but didn't find a corresponding  
Pass in LLVM, I would like to ask you, if there is an existing  
LLVM-Pass for use-def analysis.

I am looking forward to hearing from you.

Best regards,
Pascal Hefter

Hi Pascal,

could you elaborate on "use-def analysis" a bit?
If it helps, an llvm::Value does know both users and operands.

Cheers,
  Johannes


On 01/18, Pascal Dominik Hefter via llvm-dev wrote:
> Dear LLVM Developers,
> 
> I am a student at TU Darmstadt and I am currently working with LLVM in a
> project to extract data dependencies from a program.
> 
> Since I want to use a use-def chain but didn't find a corresponding
Pass in
> LLVM, I would like to ask you, if there is an existing LLVM-Pass for
use-def
> analysis.
> 
> I am looking forward to hearing from you.
> 
> Best regards,
> Pascal Hefter
> 
> _______________________________________________
> LLVM Developers mailing list
> llvm-dev at lists.llvm.org
> http://lists.llvm.org/cgi-bin/mailman/listinfo/llvm-dev
-- 

Johannes Doerfert
Researcher

Argonne National Laboratory
Lemont, IL 60439, USA

jdoerfert at anl.gov
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If by "use-def" chain you mean classical def-use analysis, you
don't
need it in LLVM, as LLVM IR is in SSA form.  The dependencies are
explicitly expressed in the IR itself.

If my "data dependence" you mean loop dependence analysis then there
are
a couple of different implementations available.

                      -David

Pascal Dominik Hefter via llvm-dev <llvm-dev at lists.llvm.org> writes:
> Dear LLVM Developers,
>
> I am a student at TU Darmstadt and I am currently working with LLVM in
> a project to extract data dependencies from a program.
>
> Since I want to use a use-def chain but didn't find a corresponding
> Pass in LLVM, I would like to ask you, if there is an existing
> LLVM-Pass for use-def analysis.
>
> I am looking forward to hearing from you.
>
> Best regards,
> Pascal Hefter
>
> _______________________________________________
> LLVM Developers mailing list
> llvm-dev at lists.llvm.org
> http://lists.llvm.org/cgi-bin/mailman/listinfo/llvm-dev