GSoC 2023 Week 19 and 20 - That's All, Folks!

This blog post is related to my GSoC 2023 Project.

Well, it is finally that time. Google Summer of Code 2023 is over for me, and I must say this has been one of the most important things I have ever done. Much like last year, I have learned an absolute ton and feel even more confident in my abilities now. Among other things, I can now say that I know how to profile code properly and make it run faster, and that I am a compiler engineer as well as an LLVM contributor (finally!). I have covered all that I did in detail in my final report.

So, for the final time, in week 19 I made this patch: [IRSymtab] Replace linear time lookup with DenseSet. This was the last performance patch I was able to make, giving a 0.09% speedup. I also put up the patch for CachedBitsValue: [InstCombine] Create a class to lazily track computed known bits. This one’s just waiting for a second round of reviews, it should land after that.

In week 20, InferAlignment landed. This patch set had been in development for 10 weeks at this point, so I am quite happy to see it finally get integrated into the pipeline. Aside from that, I set up another PR to fix a random bug: [ValueTracking] Implement sdiv/udiv support for isKnownNonNullFromDominatingCondition. Hopefully, this patch lands soon.

Now, what’s next? For a while (a month or so), I will be taking a break from LLVM to focus on personal projects and spend time learning other things for a while (foremost in my mind is Haskell). After that, I will be back contributing PRs and hopefully helping review them as well. Next year, I plan on participating again in GSoC as a mentor.