Optimization phases have no effect

[Laschoking]

Hi,
I want to use soot optimization phase jop.cse to compare the results to an own cse analysis that I wrote in doop.
From doop I have found a number of Common Subexpressions, and I would like to check if soot has similar results.

java -cp soot-4.5.0-20230118.164052-1-jar-with-dependencies.jar soot.Main -cp .:../benchmarks/master/JREs/jre1.11/lib/rt.jar -process-dir ../benchmarks/master/dacapo-2006/antlr -d Out/antlr_jop_cse/ -f J -p jop.cse on -p jb off

What confuses me, is that this phase does not seem to do any changes in the code.
When analyzing some benchmark I once run soot with -p job.cse on and once with -p job.cse off. With diff Out/SootCse/ Out/SootNoCse I do not get any results, meaning that the CSE-phase did not make any changes.
I also tried to run this option on a custom example, containing a code snippet like
if (b < a) { g = c * b; }else{ f = c * b; }
which should lead to CSE but also here this phase did not have any impact.

1. So I am wondering if this phase is actually working / whether I put the correct command line options?
   I also noticed for the sop.cpf phase no changes to happened, maybe its a related problem...
   In general soot works for me (i.e. enabling the jb -phase results in a lot of changes on the outcoming jimple/shimple code).

2. For better understanding: is there a difference when enabling -via-shimple option in comparison to enable shimple output -f S?

I would appreciate any suggestion & help :)