Hello, I'm investigating where to start and I'm overwhelmed with compilation process, so I'd like to ask you on which passes I should focus and where I actually should start. I have to find arithmetical operations in input source code and implement them using specific processor instructions on my CPU. First of all I don't see any pass related to RTL representation in GCC plugin events (file plugin.def), so is it possible to create GC plugin modifying RTL representation at all? Anyway, I should: 1. Add somehow (so far I don't know how) custom CPU instructions to GCC code. 2. Operate on RTL representation of basic blocks (I can modify RTL representations by adding and removing instructions?).
