Hi, all On the website, it says "... There are several well-known ways to do this in the literature. LLVM uses a SelectionDAG based instruction selector." I want to know more about the SelectionDAG, maybe the one which guide LLVM SelectionDAG implementation. Any suggestion? Thanks! Regards, chenwj -- Wei-Ren Chen (陳韋任) Computer Systems Lab, Institute of Information Science, Academia Sinica, Taiwan (R.O.C.) Tel:886-2-2788-3799 #1667