GraalVM: State of AArch64

While always the de facto choice of the mobile domain, recently machines using Arm's AArch64 ISA have also become prevalent within the laptop, desktop, and server marketplaces. Because of this, it is imperative for the GraalVM ecosystem to not only perform well on AArch64, but to treat AArch64 as an equal peer of AMD64. In my talk, I will give an overview of the current state of GraalVM on AArch64. This includes (i) describing the work involved in creating the GraalVM AArch64 port, (ii) providing an overview of current GraalVM AArch64 features, (iii) explaining the code architecture of the AArch64 backend and how to navigate it, and (iv) presenting some current performance numbers on AArch64. Beyond this overview, I also plan to discuss in detail some of the main challenges in getting AArch64 running on GraalVM, such adding patching support, abiding by the Java Memory Model, and utilizing AArch64's different addressing modes and branch instructions. I'll also present some of our future plans for the continued improvement of the AArch64 backend.