search for: sifixsgprcopies

...ectionDAG nodes to generic opcodes, and then run the InstructionSelector pass on the resulting MachineFunction. I would start by doing this with loads/stores and then move on to other opcodes one at a time. These changes will be a big improvement to AMDGPU, because it will allow us to replace our SIFixSGPRCopies pass which is essentially just another instruction selector that re-selects instructions based on their register classes and also let us do a much better job of matching addressing modes, which is very important for the AMDGPU target. I already have a working prototype where I run SelectionDAG ISe...