AOC compile error

These types of LLVM errors generally happen when the kernel is FPGA-unfriendly, or too complex for the compiler to handle. There is no fixed cause for them, nor is there a fixed solution. You can generally bypass them by refactoring your kernel and making it more FPGA-friendly. Other than that, you can also directly open a ticket with Altera and report the issue since this is basically a compiler bug, and only they can fix it.