How to view the raw C / AVR code generated by IDE before compliation?

no practical reason, I'm simply interested in AVRs and I'd like to see which AVR registers are being modified. This will just make that a bit easier. I KNOW that these can be found in the .cpp and .h files but this means I won't have to sift through the whole thing, I can see only the registers that are actually being written in the compiled program