Xcode Debugger - how to single step at level of CPU instructions

Question

This is definitely obsessive, but I am fascinated by how cleverly the compiler translates C code into machine instructions. Since I am a little fuzzy on some instructions, it

Answer 1

si is "Step Instruction", and ni is "Next Instruction". They have the same semantics as "step" and "next" do for lines of code, just on the instruction level.