search for: machineregisteroperand

...s though if you want a working program. > > - How do I replace a virtual register with a physical one? > > - Do I need to generate spill code to handle virtual registers that > > cannot be replaced with physical ones, and if so, how? > You could re-write it in place (using MachineRegisterOperand::setReg(<reg>) if you want to manipulate the code yourself, or you can store the mapping in a VirtRegMap object and have the LLVM VirtRegRewriter apply the changes for you. The latter would have to be used in conjunction with the other LLVM regalloc components. You'd get liveness (LiveInt...

Hi Susan, You may find the PBQP allocator implementation useful as a reference to what's involved in adding a new allocator to LLVM. It's located in lib/CodeGen/RegAllocPBQP.cpp, with supporting files in the lib/CodeGen/ PBQP directory. I'm no expert on the LLVM register allocation interfaces, so I'll defer to those who are regarding the specifics of your questions. -Jim

I'm using LLVM for a compiler course, and I'd like to have my students implement a graph-coloring register allocator. I'm having a lot of trouble figuring out how this should be done. Is there anyone who has written an LLVM register allocator who would be willing to help me understand the basic ideas? I understand the algorithm, it's LLVM that I don't understand. For