I see RDF first introduced on Hexagon, also applied on X86?
How about AArch64? We are pursuing performance improvement on AArch64.
Use RDF in Post-RA step as a peephole optimization maybe useful. I’m not sure 
So can you give me some suggestion?
RDF is intended to be architecture-independent, so it should work regardless of the target.
Are you seeing any opportunities for optimizations past RA?