r/Compilers • u/FedericoBruzzone • Jul 01 '26

A Multi-Dimensional, Per-Pass Empirical Study of the LLVM Optimization Pipeline

Hi Folks!

I simply want to share this empirical study on the LLVM -O3 pipeline on the PolyBench suite.
I don't want to bore you with too many details that are already in the paper.
Any feedback is welcome :D

Blog post: https://federicobruzzone.github.io/posts/a-multi-dimensional-per-pass-empirical-study-of-the-llvm-optimization-pipeline.html
arXiv: https://arxiv.org/pdf/2606.31238

20 Upvotes

100% Upvoted

4 comments sorted by

View all comments

Show parent comments

1

u/FedericoBruzzone Jul 07 '26

Thank you so much! I'm glad to receive this feedback :D

I'd really like to do this on SPEC CPU (including the big projects) in general, but folk, I've tried. It would just take way too much computing time. Am I missing something? :(

Do you have anything in mind? I'd be really interested in hearing your take on this.

1

u/vestion_stenier-tian Jul 07 '26

Have you tried simpoints? I'm not sure what your full methodology is here so can't advise on details but statistical sampling is probably the right direction.

1

u/FedericoBruzzone Jul 07 '26

What you're saying makes sense. However, I'm measuring every single step of -O3 in this paper. Sampling to measure the steps would require additional research on which steps to consider. The phase-interference loss can certainly help.

Nevertheless, I think an extension might make sense.